JUCE/modules/juce_gui_basics/native/juce_win32_Windowing.cpp

/*
  ==============================================================================

   This file is part of the JUCE library.
   Copyright (c) 2017 - ROLI Ltd.

   JUCE is an open source library subject to commercial or open-source
   licensing.

   By using JUCE, you agree to the terms of both the JUCE 5 End-User License
   Agreement and JUCE 5 Privacy Policy (both updated and effective as of the
   27th April 2017).

   End User License Agreement: www.juce.com/juce-5-licence
   Privacy Policy: www.juce.com/juce-5-privacy-policy

   Or: You may also use this code under the terms of the GPL v3 (see
   www.gnu.org/licenses).

   JUCE IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL WARRANTIES, WHETHER
   EXPRESSED OR IMPLIED, INCLUDING MERCHANTABILITY AND FITNESS FOR PURPOSE, ARE
   DISCLAIMED.

  ==============================================================================
*/

#if JUCE_MODULE_AVAILABLE_juce_audio_plugin_client
 #include <juce_audio_plugin_client/AAX/juce_AAX_Modifier_Injector.h>
#endif

namespace juce
{

#undef GetSystemMetrics // multimon overrides this for some reason and causes a mess..

// these are in the windows SDK, but need to be repeated here for GCC..
#ifndef GET_APPCOMMAND_LPARAM
 #define GET_APPCOMMAND_LPARAM(lParam)     ((short) (HIWORD (lParam) & ~FAPPCOMMAND_MASK))

 #define FAPPCOMMAND_MASK                  0xF000
 #define APPCOMMAND_MEDIA_NEXTTRACK        11
 #define APPCOMMAND_MEDIA_PREVIOUSTRACK    12
 #define APPCOMMAND_MEDIA_STOP             13
 #define APPCOMMAND_MEDIA_PLAY_PAUSE       14
#endif

#ifndef WM_APPCOMMAND
 #define WM_APPCOMMAND                     0x0319
#endif

extern void juce_repeatLastProcessPriority();
extern void juce_checkCurrentlyFocusedTopLevelWindow();  // in juce_TopLevelWindow.cpp
extern bool juce_isRunningInWine();

typedef bool (*CheckEventBlockedByModalComps) (const MSG&);
extern CheckEventBlockedByModalComps isEventBlockedByModalComps;

static bool shouldDeactivateTitleBar = true;

extern void* getUser32Function (const char*);

//==============================================================================
#ifndef WM_TOUCH
 enum
 {
     WM_TOUCH         = 0x0240,
     TOUCHEVENTF_MOVE = 0x0001,
     TOUCHEVENTF_DOWN = 0x0002,
     TOUCHEVENTF_UP   = 0x0004
 };

 typedef HANDLE HTOUCHINPUT;
 typedef HANDLE HGESTUREINFO;

 struct TOUCHINPUT
 {
     LONG         x;
     LONG         y;
     HANDLE       hSource;
     DWORD        dwID;
     DWORD        dwFlags;
     DWORD        dwMask;
     DWORD        dwTime;
     ULONG_PTR    dwExtraInfo;
     DWORD        cxContact;
     DWORD        cyContact;
 };

 struct GESTUREINFO
 {
     UINT         cbSize;
     DWORD        dwFlags;
     DWORD        dwID;
     HWND         hwndTarget;
     POINTS       ptsLocation;
     DWORD        dwInstanceID;
     DWORD        dwSequenceID;
     ULONGLONG    ullArguments;
     UINT         cbExtraArgs;
 };
#endif

#ifndef WM_NCPOINTERUPDATE
 enum
 {
     WM_NCPOINTERUPDATE       = 0x241,
     WM_NCPOINTERDOWN         = 0x242,
     WM_NCPOINTERUP           = 0x243,
     WM_POINTERUPDATE         = 0x245,
     WM_POINTERDOWN           = 0x246,
     WM_POINTERUP             = 0x247,
     WM_POINTERENTER          = 0x249,
     WM_POINTERLEAVE          = 0x24A,
     WM_POINTERACTIVATE       = 0x24B,
     WM_POINTERCAPTURECHANGED = 0x24C,
     WM_TOUCHHITTESTING       = 0x24D,
     WM_POINTERWHEEL          = 0x24E,
     WM_POINTERHWHEEL         = 0x24F,
     WM_POINTERHITTEST        = 0x250
 };

 enum
 {
     PT_TOUCH = 0x00000002,
     PT_PEN   = 0x00000003
 };

 enum POINTER_BUTTON_CHANGE_TYPE
 {
     POINTER_CHANGE_NONE,
     POINTER_CHANGE_FIRSTBUTTON_DOWN,
     POINTER_CHANGE_FIRSTBUTTON_UP,
     POINTER_CHANGE_SECONDBUTTON_DOWN,
     POINTER_CHANGE_SECONDBUTTON_UP,
     POINTER_CHANGE_THIRDBUTTON_DOWN,
     POINTER_CHANGE_THIRDBUTTON_UP,
     POINTER_CHANGE_FOURTHBUTTON_DOWN,
     POINTER_CHANGE_FOURTHBUTTON_UP,
     POINTER_CHANGE_FIFTHBUTTON_DOWN,
     POINTER_CHANGE_FIFTHBUTTON_UP
 };

 enum
 {
     PEN_MASK_NONE      = 0x00000000,
     PEN_MASK_PRESSURE  = 0x00000001,
     PEN_MASK_ROTATION  = 0x00000002,
     PEN_MASK_TILT_X    = 0x00000004,
     PEN_MASK_TILT_Y    = 0x00000008
 };

 enum
 {
     TOUCH_MASK_NONE        = 0x00000000,
     TOUCH_MASK_CONTACTAREA = 0x00000001,
     TOUCH_MASK_ORIENTATION = 0x00000002,
     TOUCH_MASK_PRESSURE    = 0x00000004
 };

 enum
 {
     POINTER_FLAG_NONE           = 0x00000000,
     POINTER_FLAG_NEW            = 0x00000001,
     POINTER_FLAG_INRANGE        = 0x00000002,
     POINTER_FLAG_INCONTACT      = 0x00000004,
     POINTER_FLAG_FIRSTBUTTON    = 0x00000010,
     POINTER_FLAG_SECONDBUTTON   = 0x00000020,
     POINTER_FLAG_THIRDBUTTON    = 0x00000040,
     POINTER_FLAG_FOURTHBUTTON   = 0x00000080,
     POINTER_FLAG_FIFTHBUTTON    = 0x00000100,
     POINTER_FLAG_PRIMARY        = 0x00002000,
     POINTER_FLAG_CONFIDENCE     = 0x00004000,
     POINTER_FLAG_CANCELED       = 0x00008000,
     POINTER_FLAG_DOWN           = 0x00010000,
     POINTER_FLAG_UPDATE         = 0x00020000,
     POINTER_FLAG_UP             = 0x00040000,
     POINTER_FLAG_WHEEL          = 0x00080000,
     POINTER_FLAG_HWHEEL         = 0x00100000,
     POINTER_FLAG_CAPTURECHANGED = 0x00200000,
     POINTER_FLAG_HASTRANSFORM   = 0x00400000
 };

 typedef DWORD  POINTER_INPUT_TYPE;
 typedef UINT32 POINTER_FLAGS;
 typedef UINT32 PEN_FLAGS;
 typedef UINT32 PEN_MASK;
 typedef UINT32 TOUCH_FLAGS;
 typedef UINT32 TOUCH_MASK;

 struct POINTER_INFO
 {
     POINTER_INPUT_TYPE    pointerType;
     UINT32          pointerId;
     UINT32          frameId;
     POINTER_FLAGS   pointerFlags;
     HANDLE          sourceDevice;
     HWND            hwndTarget;
     POINT           ptPixelLocation;
     POINT           ptHimetricLocation;
     POINT           ptPixelLocationRaw;
     POINT           ptHimetricLocationRaw;
     DWORD           dwTime;
     UINT32          historyCount;
     INT32           InputData;
     DWORD           dwKeyStates;
     UINT64          PerformanceCount;
     POINTER_BUTTON_CHANGE_TYPE ButtonChangeType;
 };

 struct POINTER_TOUCH_INFO
 {
     POINTER_INFO    pointerInfo;
     TOUCH_FLAGS     touchFlags;
     TOUCH_MASK      touchMask;
     RECT            rcContact;
     RECT            rcContactRaw;
     UINT32          orientation;
     UINT32          pressure;
 };

 struct POINTER_PEN_INFO
 {
     POINTER_INFO    pointerInfo;
     PEN_FLAGS       penFlags;
     PEN_MASK        penMask;
     UINT32          pressure;
     UINT32          rotation;
     INT32           tiltX;
     INT32           tiltY;
 };

 #define GET_POINTERID_WPARAM(wParam)    (LOWORD(wParam))
#endif

#ifndef MONITOR_DPI_TYPE
  enum Monitor_DPI_Type
  {
    MDT_Effective_DPI  = 0,
    MDT_Angular_DPI    = 1,
    MDT_Raw_DPI        = 2,
    MDT_Default        = MDT_Effective_DPI
  };

  enum Process_DPI_Awareness
  {
    Process_DPI_Unaware            = 0,
    Process_System_DPI_Aware       = 1,
    Process_Per_Monitor_DPI_Aware  = 2
  };
#endif

typedef BOOL (WINAPI* RegisterTouchWindowFunc) (HWND, ULONG);
typedef BOOL (WINAPI* GetTouchInputInfoFunc) (HTOUCHINPUT, UINT, TOUCHINPUT*, int);
typedef BOOL (WINAPI* CloseTouchInputHandleFunc) (HTOUCHINPUT);
typedef BOOL (WINAPI* GetGestureInfoFunc) (HGESTUREINFO, GESTUREINFO*);
typedef BOOL (WINAPI* SetProcessDPIAwareFunc)();
typedef BOOL (WINAPI* SetProcessDPIAwarenessFunc) (Process_DPI_Awareness);
typedef HRESULT (WINAPI* GetDPIForMonitorFunc) (HMONITOR, Monitor_DPI_Type, UINT*, UINT*);

static RegisterTouchWindowFunc    registerTouchWindow = nullptr;
static GetTouchInputInfoFunc      getTouchInputInfo = nullptr;
static CloseTouchInputHandleFunc  closeTouchInputHandle = nullptr;
static GetGestureInfoFunc         getGestureInfo = nullptr;
static SetProcessDPIAwareFunc     setProcessDPIAware = nullptr;
static SetProcessDPIAwarenessFunc setProcessDPIAwareness = nullptr;
static GetDPIForMonitorFunc       getDPIForMonitor = nullptr;

static bool hasCheckedForMultiTouch = false;

static bool canUseMultiTouch()
{
    if (registerTouchWindow == nullptr && ! hasCheckedForMultiTouch)
    {
        hasCheckedForMultiTouch = true;

        registerTouchWindow   = (RegisterTouchWindowFunc)   getUser32Function ("RegisterTouchWindow");
        getTouchInputInfo     = (GetTouchInputInfoFunc)     getUser32Function ("GetTouchInputInfo");
        closeTouchInputHandle = (CloseTouchInputHandleFunc) getUser32Function ("CloseTouchInputHandle");
        getGestureInfo        = (GetGestureInfoFunc)        getUser32Function ("GetGestureInfo");
    }

    return registerTouchWindow != nullptr;
}

typedef BOOL (WINAPI* GetPointerTypeFunc) (UINT32, POINTER_INPUT_TYPE*);
typedef BOOL (WINAPI* GetPointerTouchInfoFunc) (UINT32, POINTER_TOUCH_INFO*);
typedef BOOL (WINAPI* GetPointerPenInfoFunc) (UINT32, POINTER_PEN_INFO*);

static GetPointerTypeFunc      getPointerTypeFunction = nullptr;
static GetPointerTouchInfoFunc getPointerTouchInfo = nullptr;
static GetPointerPenInfoFunc   getPointerPenInfo = nullptr;

static bool canUsePointerAPI = false;

static void checkForPointerAPI()
{
    getPointerTypeFunction = (GetPointerTypeFunc) getUser32Function ("GetPointerType");
    getPointerTouchInfo    = (GetPointerTouchInfoFunc) getUser32Function ("GetPointerTouchInfo");
    getPointerPenInfo      = (GetPointerPenInfoFunc) getUser32Function ("GetPointerPenInfo");

    canUsePointerAPI = (getPointerTypeFunction != nullptr
                     && getPointerTouchInfo    != nullptr
                     && getPointerPenInfo      != nullptr);
}

static Rectangle<int> rectangleFromRECT (const RECT& r) noexcept
{
    return Rectangle<int>::leftTopRightBottom ((int) r.left, (int) r.top, (int) r.right, (int) r.bottom);
}

static void setWindowPos (HWND hwnd, Rectangle<int> bounds, UINT flags)
{
    SetWindowPos (hwnd, 0, bounds.getX(), bounds.getY(), bounds.getWidth(), bounds.getHeight(), flags);
}

static RECT getWindowRect (HWND hwnd)
{
    RECT r;
    GetWindowRect (hwnd, &r);
    return r;
}

static void setWindowZOrder (HWND hwnd, HWND insertAfter)
{
    SetWindowPos (hwnd, insertAfter, 0, 0, 0, 0, SWP_NOMOVE | SWP_NOSIZE | SWP_NOACTIVATE | SWP_NOSENDCHANGING);
}

//==============================================================================
static void setDPIAwareness()
{
   #if ! JUCE_DISABLE_WIN32_DPI_AWARENESS
    if (JUCEApplicationBase::isStandaloneApp())
    {
        if (setProcessDPIAwareness == nullptr)
        {
            HMODULE shcoreModule = GetModuleHandleA ("SHCore.dll");

            if (shcoreModule != 0)
            {
                setProcessDPIAwareness = (SetProcessDPIAwarenessFunc) GetProcAddress (shcoreModule, "SetProcessDpiAwareness");
                getDPIForMonitor = (GetDPIForMonitorFunc) GetProcAddress (shcoreModule, "GetDpiForMonitor");

                if (setProcessDPIAwareness != nullptr && getDPIForMonitor != nullptr
//                     && SUCCEEDED (setProcessDPIAwareness (Process_Per_Monitor_DPI_Aware)))
                     && SUCCEEDED (setProcessDPIAwareness (Process_System_DPI_Aware))) // (keep using this mode temporarily..)
                    return;
            }

            if (setProcessDPIAware == nullptr)
            {
                setProcessDPIAware = (SetProcessDPIAwareFunc) getUser32Function ("SetProcessDPIAware");

                if (setProcessDPIAware != nullptr)
                    setProcessDPIAware();
            }
        }
    }
   #endif
}

static double getGlobalDPI()
{
    setDPIAwareness();

    HDC dc = GetDC (0);
    const double dpi = (GetDeviceCaps (dc, LOGPIXELSX)
                      + GetDeviceCaps (dc, LOGPIXELSY)) / 2.0;
    ReleaseDC (0, dc);
    return dpi;
}

double Desktop::getDefaultMasterScale()
{
    return JUCEApplicationBase::isStandaloneApp() ? getGlobalDPI() / 96.0
                                                  : 1.0;
}

bool Desktop::canUseSemiTransparentWindows() noexcept       { return true; }

//==============================================================================
Desktop::DisplayOrientation Desktop::getCurrentOrientation() const
{
    return upright;
}

int64 getMouseEventTime()
{
    static int64 eventTimeOffset = 0;
    static LONG lastMessageTime = 0;
    const LONG thisMessageTime = GetMessageTime();

    if (thisMessageTime < lastMessageTime || lastMessageTime == 0)
    {
        lastMessageTime = thisMessageTime;
        eventTimeOffset = Time::currentTimeMillis() - thisMessageTime;
    }

    return eventTimeOffset + thisMessageTime;
}

//==============================================================================
const int extendedKeyModifier               = 0x10000;

const int KeyPress::spaceKey                = VK_SPACE;
const int KeyPress::returnKey               = VK_RETURN;
const int KeyPress::escapeKey               = VK_ESCAPE;
const int KeyPress::backspaceKey            = VK_BACK;
const int KeyPress::deleteKey               = VK_DELETE         | extendedKeyModifier;
const int KeyPress::insertKey               = VK_INSERT         | extendedKeyModifier;
const int KeyPress::tabKey                  = VK_TAB;
const int KeyPress::leftKey                 = VK_LEFT           | extendedKeyModifier;
const int KeyPress::rightKey                = VK_RIGHT          | extendedKeyModifier;
const int KeyPress::upKey                   = VK_UP             | extendedKeyModifier;
const int KeyPress::downKey                 = VK_DOWN           | extendedKeyModifier;
const int KeyPress::homeKey                 = VK_HOME           | extendedKeyModifier;
const int KeyPress::endKey                  = VK_END            | extendedKeyModifier;
const int KeyPress::pageUpKey               = VK_PRIOR          | extendedKeyModifier;
const int KeyPress::pageDownKey             = VK_NEXT           | extendedKeyModifier;
const int KeyPress::F1Key                   = VK_F1             | extendedKeyModifier;
const int KeyPress::F2Key                   = VK_F2             | extendedKeyModifier;
const int KeyPress::F3Key                   = VK_F3             | extendedKeyModifier;
const int KeyPress::F4Key                   = VK_F4             | extendedKeyModifier;
const int KeyPress::F5Key                   = VK_F5             | extendedKeyModifier;
const int KeyPress::F6Key                   = VK_F6             | extendedKeyModifier;
const int KeyPress::F7Key                   = VK_F7             | extendedKeyModifier;
const int KeyPress::F8Key                   = VK_F8             | extendedKeyModifier;
const int KeyPress::F9Key                   = VK_F9             | extendedKeyModifier;
const int KeyPress::F10Key                  = VK_F10            | extendedKeyModifier;
const int KeyPress::F11Key                  = VK_F11            | extendedKeyModifier;
const int KeyPress::F12Key                  = VK_F12            | extendedKeyModifier;
const int KeyPress::F13Key                  = VK_F13            | extendedKeyModifier;
const int KeyPress::F14Key                  = VK_F14            | extendedKeyModifier;
const int KeyPress::F15Key                  = VK_F15            | extendedKeyModifier;
const int KeyPress::F16Key                  = VK_F16            | extendedKeyModifier;
const int KeyPress::F17Key                  = VK_F17            | extendedKeyModifier;
const int KeyPress::F18Key                  = VK_F18            | extendedKeyModifier;
const int KeyPress::F19Key                  = VK_F19            | extendedKeyModifier;
const int KeyPress::F20Key                  = VK_F20            | extendedKeyModifier;
const int KeyPress::F21Key                  = VK_F21            | extendedKeyModifier;
const int KeyPress::F22Key                  = VK_F22            | extendedKeyModifier;
const int KeyPress::F23Key                  = VK_F23            | extendedKeyModifier;
const int KeyPress::F24Key                  = VK_F24            | extendedKeyModifier;
const int KeyPress::F25Key                  = 0x31000;          // Windows doesn't support F-keys 25 or higher
const int KeyPress::F26Key                  = 0x31001;
const int KeyPress::F27Key                  = 0x31002;
const int KeyPress::F28Key                  = 0x31003;
const int KeyPress::F29Key                  = 0x31004;
const int KeyPress::F30Key                  = 0x31005;
const int KeyPress::F31Key                  = 0x31006;
const int KeyPress::F32Key                  = 0x31007;
const int KeyPress::F33Key                  = 0x31008;
const int KeyPress::F34Key                  = 0x31009;
const int KeyPress::F35Key                  = 0x3100a;

const int KeyPress::numberPad0              = VK_NUMPAD0        | extendedKeyModifier;
const int KeyPress::numberPad1              = VK_NUMPAD1        | extendedKeyModifier;
const int KeyPress::numberPad2              = VK_NUMPAD2        | extendedKeyModifier;
const int KeyPress::numberPad3              = VK_NUMPAD3        | extendedKeyModifier;
const int KeyPress::numberPad4              = VK_NUMPAD4        | extendedKeyModifier;
const int KeyPress::numberPad5              = VK_NUMPAD5        | extendedKeyModifier;
const int KeyPress::numberPad6              = VK_NUMPAD6        | extendedKeyModifier;
const int KeyPress::numberPad7              = VK_NUMPAD7        | extendedKeyModifier;
const int KeyPress::numberPad8              = VK_NUMPAD8        | extendedKeyModifier;
const int KeyPress::numberPad9              = VK_NUMPAD9        | extendedKeyModifier;
const int KeyPress::numberPadAdd            = VK_ADD            | extendedKeyModifier;
const int KeyPress::numberPadSubtract       = VK_SUBTRACT       | extendedKeyModifier;
const int KeyPress::numberPadMultiply       = VK_MULTIPLY       | extendedKeyModifier;
const int KeyPress::numberPadDivide         = VK_DIVIDE         | extendedKeyModifier;
const int KeyPress::numberPadSeparator      = VK_SEPARATOR      | extendedKeyModifier;
const int KeyPress::numberPadDecimalPoint   = VK_DECIMAL        | extendedKeyModifier;
const int KeyPress::numberPadEquals         = 0x92 /*VK_OEM_NEC_EQUAL*/  | extendedKeyModifier;
const int KeyPress::numberPadDelete         = VK_DELETE         | extendedKeyModifier;
const int KeyPress::playKey                 = 0x30000;
const int KeyPress::stopKey                 = 0x30001;
const int KeyPress::fastForwardKey          = 0x30002;
const int KeyPress::rewindKey               = 0x30003;


//==============================================================================
class WindowsBitmapImage  : public ImagePixelData
{
public:
    WindowsBitmapImage (const Image::PixelFormat format,
                        const int w, const int h, const bool clearImage)
        : ImagePixelData (format, w, h)
    {
        jassert (format == Image::RGB || format == Image::ARGB);

        static bool alwaysUse32Bits = isGraphicsCard32Bit(); // NB: for 32-bit cards, it's faster to use a 32-bit image.

        pixelStride = (alwaysUse32Bits || format == Image::ARGB) ? 4 : 3;
        lineStride = -((w * pixelStride + 3) & ~3);

        zerostruct (bitmapInfo);
        bitmapInfo.bV4Size     = sizeof (BITMAPV4HEADER);
        bitmapInfo.bV4Width    = w;
        bitmapInfo.bV4Height   = h;
        bitmapInfo.bV4Planes   = 1;
        bitmapInfo.bV4CSType   = 1;
        bitmapInfo.bV4BitCount = (unsigned short) (pixelStride * 8);

        if (format == Image::ARGB)
        {
            bitmapInfo.bV4AlphaMask      = 0xff000000;
            bitmapInfo.bV4RedMask        = 0xff0000;
            bitmapInfo.bV4GreenMask      = 0xff00;
            bitmapInfo.bV4BlueMask       = 0xff;
            bitmapInfo.bV4V4Compression  = BI_BITFIELDS;
        }
        else
        {
            bitmapInfo.bV4V4Compression  = BI_RGB;
        }

        HDC dc = GetDC (0);
        hdc = CreateCompatibleDC (dc);
        ReleaseDC (0, dc);

        SetMapMode (hdc, MM_TEXT);

        hBitmap = CreateDIBSection (hdc, (BITMAPINFO*) &(bitmapInfo), DIB_RGB_COLORS,
                                    (void**) &bitmapData, 0, 0);

        previousBitmap = SelectObject (hdc, hBitmap);

        if (format == Image::ARGB && clearImage)
            zeromem (bitmapData, (size_t) std::abs (h * lineStride));

        imageData = bitmapData - (lineStride * (h - 1));
    }

    ~WindowsBitmapImage()
    {
        SelectObject (hdc, previousBitmap); // Selecting the previous bitmap before deleting the DC avoids a warning in BoundsChecker
        DeleteDC (hdc);
        DeleteObject (hBitmap);
    }

    ImageType* createType() const override                       { return new NativeImageType(); }

    LowLevelGraphicsContext* createLowLevelContext() override
    {
        sendDataChangeMessage();
        return new LowLevelGraphicsSoftwareRenderer (Image (this));
    }

    void initialiseBitmapData (Image::BitmapData& bitmap, int x, int y, Image::BitmapData::ReadWriteMode mode) override
    {
        bitmap.data = imageData + x * pixelStride + y * lineStride;
        bitmap.pixelFormat = pixelFormat;
        bitmap.lineStride = lineStride;
        bitmap.pixelStride = pixelStride;

        if (mode != Image::BitmapData::readOnly)
            sendDataChangeMessage();
    }

    ImagePixelData::Ptr clone() override
    {
        auto im = new WindowsBitmapImage (pixelFormat, width, height, false);

        for (int i = 0; i < height; ++i)
            memcpy (im->imageData + i * lineStride, imageData + i * lineStride, (size_t) lineStride);

        return im;
    }

    void blitToWindow (HWND hwnd, HDC dc, bool transparent, int x, int y, uint8 updateLayeredWindowAlpha) noexcept
    {
        SetMapMode (dc, MM_TEXT);

        if (transparent)
        {
            auto windowBounds = getWindowRect (hwnd);

            POINT p = { -x, -y };
            POINT pos = { windowBounds.left, windowBounds.top };
            SIZE size = { windowBounds.right - windowBounds.left,
                          windowBounds.bottom - windowBounds.top };

            BLENDFUNCTION bf;
            bf.AlphaFormat = 1 /*AC_SRC_ALPHA*/;
            bf.BlendFlags = 0;
            bf.BlendOp = AC_SRC_OVER;
            bf.SourceConstantAlpha = updateLayeredWindowAlpha;

            UpdateLayeredWindow (hwnd, 0, &pos, &size, hdc, &p, 0, &bf, 2 /*ULW_ALPHA*/);
        }
        else
        {
            StretchDIBits (dc,
                           x, y, width, height,
                           0, 0, width, height,
                           bitmapData, (const BITMAPINFO*) &bitmapInfo,
                           DIB_RGB_COLORS, SRCCOPY);
        }
    }

    HBITMAP hBitmap;
    HGDIOBJ previousBitmap;
    BITMAPV4HEADER bitmapInfo;
    HDC hdc;
    uint8* bitmapData;
    int pixelStride, lineStride;
    uint8* imageData;

private:
    static bool isGraphicsCard32Bit()
    {
        auto dc = GetDC (0);
        auto bitsPerPixel = GetDeviceCaps (dc, BITSPIXEL);
        ReleaseDC (0, dc);
        return bitsPerPixel > 24;
    }

    JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (WindowsBitmapImage)
};

//==============================================================================
Image createSnapshotOfNativeWindow (void*);
Image createSnapshotOfNativeWindow (void* nativeWindowHandle)
{
    auto hwnd = (HWND) nativeWindowHandle;

    auto r = getWindowRect (hwnd);
    const int w = r.right - r.left;
    const int h = r.bottom - r.top;

    auto nativeBitmap = new WindowsBitmapImage (Image::RGB, w, h, true);
    Image bitmap (nativeBitmap);

    HDC dc = GetDC (hwnd);
    BitBlt (nativeBitmap->hdc, 0, 0, w, h, dc, 0, 0, SRCCOPY);
    ReleaseDC (hwnd, dc);

    return SoftwareImageType().convert (bitmap);
}

//==============================================================================
namespace IconConverters
{
    Image createImageFromHBITMAP (HBITMAP bitmap)
    {
        Image im;

        if (bitmap != 0)
        {
            BITMAP bm;

            if (GetObject (bitmap, sizeof (BITMAP), &bm)
                 && bm.bmWidth > 0 && bm.bmHeight > 0)
            {
                auto tempDC = GetDC (0);
                auto dc = CreateCompatibleDC (tempDC);
                ReleaseDC (0, tempDC);

                SelectObject (dc, bitmap);

                im = Image (Image::ARGB, bm.bmWidth, bm.bmHeight, true);
                Image::BitmapData imageData (im, Image::BitmapData::writeOnly);

                for (int y = bm.bmHeight; --y >= 0;)
                {
                    for (int x = bm.bmWidth; --x >= 0;)
                    {
                        auto col = GetPixel (dc, x, y);

                        imageData.setPixelColour (x, y, Colour ((uint8) GetRValue (col),
                                                                (uint8) GetGValue (col),
                                                                (uint8) GetBValue (col)));
                    }
                }

                DeleteDC (dc);
            }
        }

        return im;
    }

    Image createImageFromHICON (HICON icon)
    {
        ICONINFO info;

        if (GetIconInfo (icon, &info))
        {
            auto mask  = createImageFromHBITMAP (info.hbmMask);
            auto image = createImageFromHBITMAP (info.hbmColor);

            if (mask.isValid() && image.isValid())
            {
                for (int y = image.getHeight(); --y >= 0;)
                {
                    for (int x = image.getWidth(); --x >= 0;)
                    {
                        auto brightness = mask.getPixelAt (x, y).getBrightness();

                        if (brightness > 0.0f)
                            image.multiplyAlphaAt (x, y, 1.0f - brightness);
                    }
                }

                return image;
            }
        }

        return Image();
    }

    HICON createHICONFromImage (const Image& image, const BOOL isIcon, int hotspotX, int hotspotY)
    {
        auto nativeBitmap = new WindowsBitmapImage (Image::ARGB, image.getWidth(), image.getHeight(), true);
        Image bitmap (nativeBitmap);

        {
            Graphics g (bitmap);
            g.drawImageAt (image, 0, 0);
        }

        auto mask = CreateBitmap (image.getWidth(), image.getHeight(), 1, 1, 0);

        ICONINFO info;
        info.fIcon = isIcon;
        info.xHotspot = (DWORD) hotspotX;
        info.yHotspot = (DWORD) hotspotY;
        info.hbmMask = mask;
        info.hbmColor = nativeBitmap->hBitmap;

        auto hi = CreateIconIndirect (&info);
        DeleteObject (mask);
        return hi;
    }
}

//==============================================================================
JUCE_COMCLASS (ITipInvocation, "37c994e7-432b-4834-a2f7-dce1f13b834b")  : public IUnknown
{
    static CLSID getCLSID() noexcept   { return { 0x4ce576fa, 0x83dc, 0x4f88, { 0x95, 0x1c, 0x9d, 0x07, 0x82, 0xb4, 0xe3, 0x76 } }; }

    virtual HRESULT STDMETHODCALLTYPE Toggle (HWND) = 0;
};

struct OnScreenKeyboard   : public DeletedAtShutdown,
                            private Timer
{
    void activate()
    {
        shouldBeActive = true;
        startTimer (10);
    }

    void deactivate()
    {
        shouldBeActive = false;
        startTimer (10);
    }

    JUCE_DECLARE_SINGLETON_SINGLETHREADED (OnScreenKeyboard, true)

private:
    OnScreenKeyboard()
    {
        tipInvocation.CoCreateInstance (ITipInvocation::getCLSID(), CLSCTX_INPROC_HANDLER | CLSCTX_LOCAL_SERVER);
    }

    ~OnScreenKeyboard()
    {
        clearSingletonInstance();
    }

    void timerCallback() override
    {
        stopTimer();

        if (reentrant || tipInvocation == nullptr)
            return;

        const ScopedValueSetter<bool> setter (reentrant, true, false);

        const bool isActive = isVisible();

        if (isActive != shouldBeActive)
        {
            if (! isActive)
            {
                tipInvocation->Toggle (GetDesktopWindow());
            }
            else
            {
                if (auto hwnd = FindWindow (L"IPTip_Main_Window", NULL))
                    PostMessage (hwnd, WM_SYSCOMMAND, (int) SC_CLOSE, 0);
            }
        }
    }

    bool isVisible()
    {
        if (auto hwnd = FindWindow (L"IPTip_Main_Window", NULL))
        {
            auto style = GetWindowLong (hwnd, GWL_STYLE);
            return (style & WS_DISABLED) == 0 && (style & WS_VISIBLE) != 0;
        }

        return false;
    }

    bool shouldBeActive = false, reentrant = false;
    ComSmartPtr<ITipInvocation> tipInvocation;
};

JUCE_IMPLEMENT_SINGLETON (OnScreenKeyboard)

//==============================================================================
struct HSTRING_PRIVATE;
typedef HSTRING_PRIVATE* HSTRING;

struct IInspectable : public IUnknown
{
    virtual HRESULT STDMETHODCALLTYPE GetIids (ULONG* ,IID**) = 0;
    virtual HRESULT STDMETHODCALLTYPE GetRuntimeClassName (HSTRING*) = 0;
    virtual HRESULT STDMETHODCALLTYPE GetTrustLevel (void*) = 0;
};

JUCE_COMCLASS (IUIViewSettingsInterop, "3694dbf9-8f68-44be-8ff5-195c98ede8a6")  : public IInspectable
{
    virtual HRESULT STDMETHODCALLTYPE GetForWindow (HWND, REFIID, void**) = 0;
};

JUCE_COMCLASS (IUIViewSettings, "c63657f6-8850-470d-88f8-455e16ea2c26")  : public IInspectable
{
    enum UserInteractionMode
    {
        Mouse = 0,
        Touch = 1
    };

    virtual HRESULT STDMETHODCALLTYPE GetUserInteractionMode (UserInteractionMode*) = 0;
};


struct UWPUIViewSettings
{
    UWPUIViewSettings()
    {
        ComBaseModule dll (L"api-ms-win-core-winrt-l1-1-0");

        if (dll.h != nullptr)
        {
            roInitialize           = (RoInitializeFuncPtr)           ::GetProcAddress (dll.h, "RoInitialize");
            roGetActivationFactory = (RoGetActivationFactoryFuncPtr) ::GetProcAddress (dll.h, "RoGetActivationFactory");
            createHString          = (WindowsCreateStringFuncPtr)    ::GetProcAddress (dll.h, "WindowsCreateString");
            deleteHString          = (WindowsDeleteStringFuncPtr)    ::GetProcAddress (dll.h, "WindowsDeleteString");

            if (roInitialize == nullptr || roGetActivationFactory == nullptr
                 || createHString == nullptr || deleteHString == nullptr)
                return;

            auto status = roInitialize (1);

            if (status != S_OK && status != S_FALSE && (unsigned) status != 0x80010106L)
                return;

            LPCWSTR uwpClassName = L"Windows.UI.ViewManagement.UIViewSettings";
            HSTRING uwpClassId;

            if (createHString (uwpClassName, (::UINT32) wcslen (uwpClassName), &uwpClassId) != S_OK
                 || uwpClassId == nullptr)
                return;

            status = roGetActivationFactory (uwpClassId, __uuidof (IUIViewSettingsInterop),
                                             (void**) viewSettingsInterop.resetAndGetPointerAddress());
            deleteHString (uwpClassId);

            if (status != S_OK || viewSettingsInterop == nullptr)
                return;

            // move dll into member var
            comBaseDLL = static_cast<ComBaseModule&&> (dll);
        }
    }

    bool isTabletModeActivatedForWindow (::HWND hWnd) const
    {
        if (viewSettingsInterop == nullptr)
            return false;

        ComSmartPtr<IUIViewSettings> viewSettings;

        if (viewSettingsInterop->GetForWindow (hWnd, __uuidof (IUIViewSettings),
                                               (void**) viewSettings.resetAndGetPointerAddress()) == S_OK
             && viewSettings != nullptr)
        {
            IUIViewSettings::UserInteractionMode mode;

            if (viewSettings->GetUserInteractionMode (&mode) == S_OK)
                return mode == IUIViewSettings::Touch;
        }

        return false;
    }

private:
    //==============================================================================
    struct ComBaseModule
    {
        ComBaseModule() {}
        ComBaseModule (LPCWSTR libraryName) : h (::LoadLibrary (libraryName)) {}
        ComBaseModule (ComBaseModule&& o) : h (o.h) { o.h = nullptr; }
        ~ComBaseModule() { release(); }

        void release() { if (h != nullptr) ::FreeLibrary (h); h = nullptr; }
        ComBaseModule& operator= (ComBaseModule&& o) { release(); h = o.h; o.h = nullptr; return *this; }

        HMODULE h = {};
    };

    typedef HRESULT (WINAPI* RoInitializeFuncPtr) (int);
    typedef HRESULT (WINAPI* RoGetActivationFactoryFuncPtr) (HSTRING, REFIID, void**);
    typedef HRESULT (WINAPI* WindowsCreateStringFuncPtr) (LPCWSTR,UINT32, HSTRING*);
    typedef HRESULT (WINAPI* WindowsDeleteStringFuncPtr) (HSTRING);

    ComBaseModule comBaseDLL;
    ComSmartPtr<IUIViewSettingsInterop> viewSettingsInterop;

    RoInitializeFuncPtr roInitialize;
    RoGetActivationFactoryFuncPtr roGetActivationFactory;
    WindowsCreateStringFuncPtr createHString;
    WindowsDeleteStringFuncPtr deleteHString;
};

//==============================================================================
class HWNDComponentPeer  : public ComponentPeer,
                           private Timer
                          #if JUCE_MODULE_AVAILABLE_juce_audio_plugin_client
                           , public ModifierKeyReceiver
                          #endif
{
public:
    enum RenderingEngineType
    {
        softwareRenderingEngine = 0,
        direct2DRenderingEngine
    };

    //==============================================================================
    HWNDComponentPeer (Component& comp, const int windowStyleFlags, HWND parent, bool nonRepainting)
        : ComponentPeer (comp, windowStyleFlags),
          dontRepaint (nonRepainting),
          parentToAddTo (parent),
          currentRenderingEngine (softwareRenderingEngine)
    {
        callFunctionIfNotLocked (&createWindowCallback, this);

        setTitle (component.getName());

        if ((windowStyleFlags & windowHasDropShadow) != 0
             && ((! hasTitleBar()) || SystemStats::getOperatingSystemType() < SystemStats::WinVista))
        {
            shadower = component.getLookAndFeel().createDropShadowerForComponent (&component);

            if (shadower != nullptr)
                shadower->setOwner (&component);
        }

        // make sure that the on-screen keyboard code is loaded
        OnScreenKeyboard::getInstance();
    }

    ~HWNDComponentPeer()
    {
        shadower = nullptr;
        currentTouches.deleteAllTouchesForPeer (this);

        // do this before the next bit to avoid messages arriving for this window
        // before it's destroyed
        JuceWindowIdentifier::setAsJUCEWindow (hwnd, false);

        callFunctionIfNotLocked (&destroyWindowCallback, (void*) hwnd);

        if (currentWindowIcon != 0)
            DestroyIcon (currentWindowIcon);

        if (dropTarget != nullptr)
        {
            dropTarget->peerIsDeleted = true;
            dropTarget->Release();
            dropTarget = nullptr;
        }

       #if JUCE_DIRECT2D
        direct2DContext = nullptr;
       #endif
    }

    //==============================================================================
    void* getNativeHandle() const override    { return hwnd; }

    void setVisible (bool shouldBeVisible) override
    {
        ShowWindow (hwnd, shouldBeVisible ? SW_SHOWNA : SW_HIDE);

        if (shouldBeVisible)
            InvalidateRect (hwnd, 0, 0);
        else
            lastPaintTime = 0;
    }

    void setTitle (const String& title) override
    {
        // Unfortunately some ancient bits of win32 mean you can only perform this operation from the message thread.
        jassert (MessageManager::getInstance()->isThisTheMessageThread());

        SetWindowText (hwnd, title.toWideCharPointer());
    }

    void repaintNowIfTransparent()
    {
        if (isUsingUpdateLayeredWindow() && lastPaintTime > 0 && Time::getMillisecondCounter() > lastPaintTime + 30)
            handlePaintMessage();
    }

    void updateBorderSize()
    {
        WINDOWINFO info;
        info.cbSize = sizeof (info);

        if (GetWindowInfo (hwnd, &info))
            windowBorder = BorderSize<int> (info.rcClient.top - info.rcWindow.top,
                                            info.rcClient.left - info.rcWindow.left,
                                            info.rcWindow.bottom - info.rcClient.bottom,
                                            info.rcWindow.right - info.rcClient.right);

       #if JUCE_DIRECT2D
        if (direct2DContext != nullptr)
            direct2DContext->resized();
       #endif
    }

    void setBounds (const Rectangle<int>& bounds, bool isNowFullScreen) override
    {
        fullScreen = isNowFullScreen;

        auto newBounds = windowBorder.addedTo (bounds);

        if (isUsingUpdateLayeredWindow())
        {
            if (auto parentHwnd = GetParent (hwnd))
            {
                auto parentRect = getWindowRect (parentHwnd);
                newBounds.translate (parentRect.left, parentRect.top);
            }
        }

        auto oldBounds = getBounds();
        const bool hasMoved = (oldBounds.getPosition() != bounds.getPosition());
        const bool hasResized = (oldBounds.getWidth() != bounds.getWidth()
                                  || oldBounds.getHeight() != bounds.getHeight());

        DWORD flags = SWP_NOACTIVATE | SWP_NOZORDER | SWP_NOOWNERZORDER;
        if (! hasMoved)    flags |= SWP_NOMOVE;
        if (! hasResized)  flags |= SWP_NOSIZE;

        setWindowPos (hwnd, newBounds, flags);

        if (hasResized && isValidPeer (this))
        {
            updateBorderSize();
            repaintNowIfTransparent();
        }
    }

    Rectangle<int> getBounds() const override
    {
        auto bounds = rectangleFromRECT (getWindowRect (hwnd));

        if (auto parentH = GetParent (hwnd))
        {
            auto r = getWindowRect (parentH);
            bounds.translate (-r.left, -r.top);
        }

        return windowBorder.subtractedFrom (bounds);
    }

    Point<int> getScreenPosition() const
    {
        auto r = getWindowRect (hwnd);

        return { r.left + windowBorder.getLeft(),
                 r.top  + windowBorder.getTop() };
    }

    Point<float> localToGlobal (Point<float> relativePosition) override  { return relativePosition + getScreenPosition().toFloat(); }
    Point<float> globalToLocal (Point<float> screenPosition) override    { return screenPosition   - getScreenPosition().toFloat(); }

    void setAlpha (float newAlpha) override
    {
        auto intAlpha = (uint8) jlimit (0, 255, (int) (newAlpha * 255.0f));

        if (component.isOpaque())
        {
            if (newAlpha < 1.0f)
            {
                SetWindowLong (hwnd, GWL_EXSTYLE, GetWindowLong (hwnd, GWL_EXSTYLE) | WS_EX_LAYERED);
                SetLayeredWindowAttributes (hwnd, RGB (0, 0, 0), intAlpha, LWA_ALPHA);
            }
            else
            {
                SetWindowLong (hwnd, GWL_EXSTYLE, GetWindowLong (hwnd, GWL_EXSTYLE) & ~WS_EX_LAYERED);
                RedrawWindow (hwnd, 0, 0, RDW_ERASE | RDW_INVALIDATE | RDW_FRAME | RDW_ALLCHILDREN);
            }
        }
        else
        {
            updateLayeredWindowAlpha = intAlpha;
            component.repaint();
        }
    }

    void setMinimised (bool shouldBeMinimised) override
    {
        if (shouldBeMinimised != isMinimised())
            ShowWindow (hwnd, shouldBeMinimised ? SW_MINIMIZE : SW_SHOWNORMAL);
    }

    bool isMinimised() const override
    {
        WINDOWPLACEMENT wp;
        wp.length = sizeof (WINDOWPLACEMENT);
        GetWindowPlacement (hwnd, &wp);

        return wp.showCmd == SW_SHOWMINIMIZED;
    }

    void setFullScreen (bool shouldBeFullScreen) override
    {
        setMinimised (false);

        if (isFullScreen() != shouldBeFullScreen)
        {
            if (constrainer != nullptr)
                constrainer->resizeStart();

            fullScreen = shouldBeFullScreen;
            const WeakReference<Component> deletionChecker (&component);

            if (! fullScreen)
            {
                auto boundsCopy = lastNonFullscreenBounds;

                if (hasTitleBar())
                    ShowWindow (hwnd, SW_SHOWNORMAL);

                if (! boundsCopy.isEmpty())
                    setBounds (ScalingHelpers::scaledScreenPosToUnscaled (component, boundsCopy), false);
            }
            else
            {
                if (hasTitleBar())
                    ShowWindow (hwnd, SW_SHOWMAXIMIZED);
                else
                    SendMessageW (hwnd, WM_SETTINGCHANGE, 0, 0);
            }

            if (deletionChecker != nullptr)
                handleMovedOrResized();

            if (constrainer != nullptr)
                constrainer->resizeEnd();
        }
    }

    bool isFullScreen() const override
    {
        if (! hasTitleBar())
            return fullScreen;

        WINDOWPLACEMENT wp;
        wp.length = sizeof (wp);
        GetWindowPlacement (hwnd, &wp);

        return wp.showCmd == SW_SHOWMAXIMIZED;
    }

    bool contains (Point<int> localPos, bool trueIfInAChildWindow) const override
    {
        auto r = getWindowRect (hwnd);

        if (! (isPositiveAndBelow (localPos.x, r.right - r.left)
                && isPositiveAndBelow (localPos.y, r.bottom - r.top)))
            return false;

        POINT p = { localPos.x + r.left + windowBorder.getLeft(),
                    localPos.y + r.top  + windowBorder.getTop() };

        HWND w = WindowFromPoint (p);
        return w == hwnd || (trueIfInAChildWindow && (IsChild (hwnd, w) != 0));
    }

    BorderSize<int> getFrameSize() const override
    {
        return windowBorder;
    }

    bool setAlwaysOnTop (bool alwaysOnTop) override
    {
        const bool oldDeactivate = shouldDeactivateTitleBar;
        shouldDeactivateTitleBar = ((styleFlags & windowIsTemporary) == 0);

        setWindowZOrder (hwnd, alwaysOnTop ? HWND_TOPMOST : HWND_NOTOPMOST);

        shouldDeactivateTitleBar = oldDeactivate;

        if (shadower != nullptr)
            handleBroughtToFront();

        return true;
    }

    void toFront (bool makeActive) override
    {
        setMinimised (false);

        const bool oldDeactivate = shouldDeactivateTitleBar;
        shouldDeactivateTitleBar = ((styleFlags & windowIsTemporary) == 0);

        callFunctionIfNotLocked (makeActive ? &toFrontCallback1 : &toFrontCallback2, hwnd);

        shouldDeactivateTitleBar = oldDeactivate;

        if (! makeActive)
        {
            // in this case a broughttofront call won't have occurred, so do it now..
            handleBroughtToFront();
        }
    }

    void toBehind (ComponentPeer* other) override
    {
        if (auto* otherPeer = dynamic_cast<HWNDComponentPeer*> (other))
        {
            setMinimised (false);

            // Must be careful not to try to put a topmost window behind a normal one, or Windows
            // promotes the normal one to be topmost!
            if (component.isAlwaysOnTop() == otherPeer->getComponent().isAlwaysOnTop())
                setWindowZOrder (hwnd, otherPeer->hwnd);
            else if (otherPeer->getComponent().isAlwaysOnTop())
                setWindowZOrder (hwnd, HWND_TOP);
        }
        else
        {
            jassertfalse; // wrong type of window?
        }
    }

    bool isFocused() const override
    {
        return callFunctionIfNotLocked (&getFocusCallback, 0) == (void*) hwnd;
    }

    void grabFocus() override
    {
        const bool oldDeactivate = shouldDeactivateTitleBar;
        shouldDeactivateTitleBar = ((styleFlags & windowIsTemporary) == 0);

        callFunctionIfNotLocked (&setFocusCallback, hwnd);

        shouldDeactivateTitleBar = oldDeactivate;
    }

    void textInputRequired (Point<int>, TextInputTarget&) override
    {
        if (! hasCreatedCaret)
        {
            hasCreatedCaret = true;
            CreateCaret (hwnd, (HBITMAP) 1, 0, 0);
        }

        ShowCaret (hwnd);
        SetCaretPos (0, 0);

        if (uwpViewSettings.isTabletModeActivatedForWindow (hwnd))
            OnScreenKeyboard::getInstance()->activate();
    }

    void dismissPendingTextInput() override
    {
        imeHandler.handleSetContext (hwnd, false);

        if (uwpViewSettings.isTabletModeActivatedForWindow (hwnd))
            OnScreenKeyboard::getInstance()->deactivate();
    }

    void repaint (const Rectangle<int>& area) override
    {
        const RECT r = { area.getX(), area.getY(), area.getRight(), area.getBottom() };
        InvalidateRect (hwnd, &r, FALSE);
    }

    void performAnyPendingRepaintsNow() override
    {
        if (component.isVisible())
        {
            WeakReference<Component> localRef (&component);
            MSG m;

            if (isUsingUpdateLayeredWindow() || PeekMessage (&m, hwnd, WM_PAINT, WM_PAINT, PM_REMOVE))
                if (localRef != nullptr) // (the PeekMessage call can dispatch messages, which may delete this comp)
                    handlePaintMessage();
        }
    }

    //==============================================================================
    static HWNDComponentPeer* getOwnerOfWindow (HWND h) noexcept
    {
        if (h != 0 && JuceWindowIdentifier::isJUCEWindow (h))
            return (HWNDComponentPeer*) GetWindowLongPtr (h, 8);

        return nullptr;
    }

    //==============================================================================
    bool isInside (HWND h) const noexcept
    {
        return GetAncestor (hwnd, GA_ROOT) == h;
    }

    //==============================================================================
    static bool isKeyDown (const int key) noexcept  { return (GetAsyncKeyState (key) & 0x8000) != 0; }

    static void updateKeyModifiers() noexcept
    {
        int keyMods = 0;
        if (isKeyDown (VK_SHIFT))   keyMods |= ModifierKeys::shiftModifier;
        if (isKeyDown (VK_CONTROL)) keyMods |= ModifierKeys::ctrlModifier;
        if (isKeyDown (VK_MENU))    keyMods |= ModifierKeys::altModifier;

        // workaround: Windows maps AltGr to left-Ctrl + right-Alt.
        if (isKeyDown (VK_RMENU) && !isKeyDown (VK_RCONTROL))
        {
            keyMods = (keyMods & ~ModifierKeys::ctrlModifier) | ModifierKeys::altModifier;
        }

        currentModifiers = currentModifiers.withOnlyMouseButtons().withFlags (keyMods);
    }

    static void updateModifiersFromWParam (const WPARAM wParam)
    {
        int mouseMods = 0;
        if (wParam & MK_LBUTTON)   mouseMods |= ModifierKeys::leftButtonModifier;
        if (wParam & MK_RBUTTON)   mouseMods |= ModifierKeys::rightButtonModifier;
        if (wParam & MK_MBUTTON)   mouseMods |= ModifierKeys::middleButtonModifier;

        currentModifiers = currentModifiers.withoutMouseButtons().withFlags (mouseMods);
        updateKeyModifiers();
    }

    //==============================================================================
    bool dontRepaint;

    static ModifierKeys currentModifiers;
    static ModifierKeys modifiersAtLastCallback;

    //==============================================================================
    struct FileDropTarget    : public ComBaseClassHelper<IDropTarget>
    {
        FileDropTarget (HWNDComponentPeer& p)   : peer (p) {}

        JUCE_COMRESULT DragEnter (IDataObject* pDataObject, DWORD grfKeyState, POINTL mousePos, DWORD* pdwEffect) override
        {
            auto hr = updateFileList (pDataObject);
            if (FAILED (hr))
                return hr;

            return DragOver (grfKeyState, mousePos, pdwEffect);
        }

        JUCE_COMRESULT DragLeave() override
        {
            if (peerIsDeleted)
                return S_FALSE;

            peer.handleDragExit (dragInfo);
            return S_OK;
        }

        JUCE_COMRESULT DragOver (DWORD /*grfKeyState*/, POINTL mousePos, DWORD* pdwEffect) override
        {
            if (peerIsDeleted)
                return S_FALSE;

            dragInfo.position = getMousePos (mousePos).roundToInt();
            *pdwEffect = peer.handleDragMove (dragInfo) ? (DWORD) DROPEFFECT_COPY
                                                        : (DWORD) DROPEFFECT_NONE;
            return S_OK;
        }

        JUCE_COMRESULT Drop (IDataObject* pDataObject, DWORD /*grfKeyState*/, POINTL mousePos, DWORD* pdwEffect) override
        {
            HRESULT hr = updateFileList (pDataObject);
            if (FAILED (hr))
                return hr;

            dragInfo.position = getMousePos (mousePos).roundToInt();
            *pdwEffect = peer.handleDragDrop (dragInfo) ? (DWORD) DROPEFFECT_COPY
                                                        : (DWORD) DROPEFFECT_NONE;
            return S_OK;
        }

        HWNDComponentPeer& peer;
        ComponentPeer::DragInfo dragInfo;
        bool peerIsDeleted = false;

    private:
        Point<float> getMousePos (POINTL mousePos) const
        {
            auto& comp = peer.getComponent();
            return comp.getLocalPoint (nullptr, ScalingHelpers::unscaledScreenPosToScaled (comp.getDesktopScaleFactor(),
                                                                                           Point<float> (static_cast<float> (mousePos.x),
                                                                                                         static_cast<float> (mousePos.y))));
        }

        template <typename CharType>
        void parseFileList (const CharType* names, const SIZE_T totalLen)
        {
            for (unsigned int i = 0;;)
            {
                unsigned int len = 0;
                while (i + len < totalLen && names [i + len] != 0)
                    ++len;

                if (len == 0)
                    break;

                dragInfo.files.add (String (names + i, len));
                i += len + 1;
            }
        }

        struct DroppedData
        {
            DroppedData (IDataObject* dataObject, CLIPFORMAT type)
            {
                FORMATETC format = { type, 0, DVASPECT_CONTENT, -1, TYMED_HGLOBAL };
                STGMEDIUM resetMedium = { TYMED_HGLOBAL, { 0 }, 0 };
                medium = resetMedium;

                if (SUCCEEDED (error = dataObject->GetData (&format, &medium)))
                {
                    dataSize = GlobalSize (medium.hGlobal);
                    data = GlobalLock (medium.hGlobal);
                }
            }

            ~DroppedData()
            {
                if (data != nullptr)
                    GlobalUnlock (medium.hGlobal);
            }

            HRESULT error;
            STGMEDIUM medium;
            void* data = {};
            SIZE_T dataSize;
        };

        HRESULT updateFileList (IDataObject* const dataObject)
        {
            if (peerIsDeleted)
                return S_FALSE;

            dragInfo.clear();

            {
                DroppedData fileData (dataObject, CF_HDROP);

                if (SUCCEEDED (fileData.error))
                {
                    const LPDROPFILES dropFiles = static_cast<const LPDROPFILES> (fileData.data);
                    const void* const names = addBytesToPointer (dropFiles, sizeof (DROPFILES));

                    if (dropFiles->fWide)
                        parseFileList (static_cast<const WCHAR*> (names), fileData.dataSize);
                    else
                        parseFileList (static_cast<const char*>  (names), fileData.dataSize);

                    return S_OK;
                }
            }

            DroppedData textData (dataObject, CF_UNICODETEXT);

            if (SUCCEEDED (textData.error))
            {
                dragInfo.text = String (CharPointer_UTF16 ((const WCHAR*) textData.data),
                                        CharPointer_UTF16 ((const WCHAR*) addBytesToPointer (textData.data, textData.dataSize)));
                return S_OK;
            }

            return textData.error;
        }

        JUCE_DECLARE_NON_COPYABLE (FileDropTarget)
    };

    static bool offerKeyMessageToJUCEWindow (MSG& m)
    {
        if (m.message == WM_KEYDOWN || m.message == WM_KEYUP)
            if (Component::getCurrentlyFocusedComponent() != nullptr)
                if (auto* h = getOwnerOfWindow (m.hwnd))
                    return m.message == WM_KEYDOWN ? h->doKeyDown (m.wParam)
                                                   : h->doKeyUp (m.wParam);

        return false;
    }

private:
    HWND hwnd, parentToAddTo;
    ScopedPointer<DropShadower> shadower;
    RenderingEngineType currentRenderingEngine;
   #if JUCE_DIRECT2D
    ScopedPointer<Direct2DLowLevelGraphicsContext> direct2DContext;
   #endif
    uint32 lastPaintTime = 0;
    ULONGLONG lastMagnifySize = 0;
    bool fullScreen = false, isDragging = false, isMouseOver = false,
         hasCreatedCaret = false, constrainerIsResizing = false;
    BorderSize<int> windowBorder;
    HICON currentWindowIcon = 0;
    FileDropTarget* dropTarget = nullptr;
    uint8 updateLayeredWindowAlpha = 255;
    UWPUIViewSettings uwpViewSettings;
   #if JUCE_MODULE_AVAILABLE_juce_audio_plugin_client
    ModifierKeyProvider* modProvider = nullptr;
   #endif

    static MultiTouchMapper<DWORD> currentTouches;

    //==============================================================================
    struct TemporaryImage    : private Timer
    {
        TemporaryImage() {}

        Image& getImage (bool transparent, int w, int h)
        {
            auto format = transparent ? Image::ARGB : Image::RGB;

            if ((! image.isValid()) || image.getWidth() < w || image.getHeight() < h || image.getFormat() != format)
                image = Image (new WindowsBitmapImage (format, (w + 31) & ~31, (h + 31) & ~31, false));

            startTimer (3000);
            return image;
        }

        void timerCallback() override
        {
            stopTimer();
            image = {};
        }

    private:
        Image image;

        JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (TemporaryImage)
    };

    TemporaryImage offscreenImageGenerator;

    //==============================================================================
    class WindowClassHolder    : private DeletedAtShutdown
    {
    public:
        WindowClassHolder()
        {
            // this name has to be different for each app/dll instance because otherwise poor old Windows can
            // get a bit confused (even despite it not being a process-global window class).
            String windowClassName ("JUCE_");
            windowClassName << String::toHexString (Time::currentTimeMillis());

            auto moduleHandle = (HINSTANCE) Process::getCurrentModuleInstanceHandle();

            TCHAR moduleFile[1024] = { 0 };
            GetModuleFileName (moduleHandle, moduleFile, 1024);
            WORD iconNum = 0;

            WNDCLASSEX wcex = { 0 };
            wcex.cbSize         = sizeof (wcex);
            wcex.style          = CS_OWNDC;
            wcex.lpfnWndProc    = (WNDPROC) windowProc;
            wcex.lpszClassName  = windowClassName.toWideCharPointer();
            wcex.cbWndExtra     = 32;
            wcex.hInstance      = moduleHandle;
            wcex.hIcon          = ExtractAssociatedIcon (moduleHandle, moduleFile, &iconNum);
            iconNum = 1;
            wcex.hIconSm        = ExtractAssociatedIcon (moduleHandle, moduleFile, &iconNum);

            atom = RegisterClassEx (&wcex);
            jassert (atom != 0);

            isEventBlockedByModalComps = checkEventBlockedByModalComps;
        }

        ~WindowClassHolder()
        {
            if (ComponentPeer::getNumPeers() == 0)
                UnregisterClass (getWindowClassName(), (HINSTANCE) Process::getCurrentModuleInstanceHandle());

            clearSingletonInstance();
        }

        LPCTSTR getWindowClassName() const noexcept     { return (LPCTSTR) (pointer_sized_uint) atom; }

        JUCE_DECLARE_SINGLETON_SINGLETHREADED_MINIMAL (WindowClassHolder)

    private:
        ATOM atom;

        static bool isHWNDBlockedByModalComponents (HWND h)
        {
            for (int i = Desktop::getInstance().getNumComponents(); --i >= 0;)
                if (auto* c = Desktop::getInstance().getComponent (i))
                    if ((! c->isCurrentlyBlockedByAnotherModalComponent())
                          && IsChild ((HWND) c->getWindowHandle(), h))
                        return false;

            return true;
        }

        static bool checkEventBlockedByModalComps (const MSG& m)
        {
            if (Component::getNumCurrentlyModalComponents() == 0 || JuceWindowIdentifier::isJUCEWindow (m.hwnd))
                return false;

            switch (m.message)
            {
                case WM_MOUSEMOVE:
                case WM_NCMOUSEMOVE:
                case 0x020A: /* WM_MOUSEWHEEL */
                case 0x020E: /* WM_MOUSEHWHEEL */
                case WM_KEYUP:
                case WM_SYSKEYUP:
                case WM_CHAR:
                case WM_APPCOMMAND:
                case WM_LBUTTONUP:
                case WM_MBUTTONUP:
                case WM_RBUTTONUP:
                case WM_MOUSEACTIVATE:
                case WM_NCMOUSEHOVER:
                case WM_MOUSEHOVER:
                case WM_TOUCH:
                case WM_POINTERUPDATE:
                case WM_NCPOINTERUPDATE:
                case WM_POINTERWHEEL:
                case WM_POINTERHWHEEL:
                case WM_POINTERUP:
                case WM_POINTERACTIVATE:
                    return isHWNDBlockedByModalComponents(m.hwnd);
                case WM_NCLBUTTONDOWN:
                case WM_NCLBUTTONDBLCLK:
                case WM_NCRBUTTONDOWN:
                case WM_NCRBUTTONDBLCLK:
                case WM_NCMBUTTONDOWN:
                case WM_NCMBUTTONDBLCLK:
                case WM_LBUTTONDOWN:
                case WM_LBUTTONDBLCLK:
                case WM_MBUTTONDOWN:
                case WM_MBUTTONDBLCLK:
                case WM_RBUTTONDOWN:
                case WM_RBUTTONDBLCLK:
                case WM_KEYDOWN:
                case WM_SYSKEYDOWN:
                case WM_NCPOINTERDOWN:
                case WM_POINTERDOWN:
                    if (isHWNDBlockedByModalComponents (m.hwnd))
                    {
                        if (auto* modal = Component::getCurrentlyModalComponent (0))
                            modal->inputAttemptWhenModal();

                        return true;
                    }
                    break;

                default:
                    break;
            }

            return false;
        }

        JUCE_DECLARE_NON_COPYABLE (WindowClassHolder)
    };

    //==============================================================================
    static void* createWindowCallback (void* userData)
    {
        static_cast<HWNDComponentPeer*> (userData)->createWindow();
        return nullptr;
    }

    void createWindow()
    {
        DWORD exstyle = 0;
        DWORD type = WS_CLIPSIBLINGS | WS_CLIPCHILDREN;

        if (hasTitleBar())
        {
            type |= WS_OVERLAPPED;

            if ((styleFlags & windowHasCloseButton) != 0)
            {
                type |= WS_SYSMENU;
            }
            else
            {
                // annoyingly, windows won't let you have a min/max button without a close button
                jassert ((styleFlags & (windowHasMinimiseButton | windowHasMaximiseButton)) == 0);
            }

            if ((styleFlags & windowIsResizable) != 0)
                type |= WS_THICKFRAME;
        }
        else if (parentToAddTo != 0)
        {
            type |= WS_CHILD;
        }
        else
        {
            type |= WS_POPUP | WS_SYSMENU;
        }

        if ((styleFlags & windowAppearsOnTaskbar) == 0)
            exstyle |= WS_EX_TOOLWINDOW;
        else
            exstyle |= WS_EX_APPWINDOW;

        if ((styleFlags & windowHasMinimiseButton) != 0)    type |= WS_MINIMIZEBOX;
        if ((styleFlags & windowHasMaximiseButton) != 0)    type |= WS_MAXIMIZEBOX;
        if ((styleFlags & windowIgnoresMouseClicks) != 0)   exstyle |= WS_EX_TRANSPARENT;
        if ((styleFlags & windowIsSemiTransparent) != 0)    exstyle |= WS_EX_LAYERED;

        hwnd = CreateWindowEx (exstyle, WindowClassHolder::getInstance()->getWindowClassName(),
                               L"", type, 0, 0, 0, 0, parentToAddTo, 0,
                               (HINSTANCE) Process::getCurrentModuleInstanceHandle(), 0);

        if (hwnd != 0)
        {
            SetWindowLongPtr (hwnd, 0, 0);
            SetWindowLongPtr (hwnd, 8, (LONG_PTR) this);
            JuceWindowIdentifier::setAsJUCEWindow (hwnd, true);

            if (dropTarget == nullptr)
            {
                HWNDComponentPeer* peer = nullptr;

                if (dontRepaint)
                    peer = getOwnerOfWindow (parentToAddTo);

                if (peer == nullptr)
                    peer = this;

                dropTarget = new FileDropTarget (*peer);
            }

            RegisterDragDrop (hwnd, dropTarget);

            if (canUseMultiTouch())
                registerTouchWindow (hwnd, 0);

            setDPIAwareness();
            setMessageFilter();
            updateBorderSize();
            checkForPointerAPI();

            // Calling this function here is (for some reason) necessary to make Windows
            // correctly enable the menu items that we specify in the wm_initmenu message.
            GetSystemMenu (hwnd, false);

            auto alpha = component.getAlpha();
            if (alpha < 1.0f)
                setAlpha (alpha);
        }
        else
        {
            jassertfalse;
        }
    }

    static void* destroyWindowCallback (void* handle)
    {
        RevokeDragDrop ((HWND) handle);
        DestroyWindow ((HWND) handle);
        return nullptr;
    }

    static void* toFrontCallback1 (void* h)
    {
        SetForegroundWindow ((HWND) h);
        return nullptr;
    }

    static void* toFrontCallback2 (void* h)
    {
        setWindowZOrder ((HWND) h, HWND_TOP);
        return nullptr;
    }

    static void* setFocusCallback (void* h)
    {
        SetFocus ((HWND) h);
        return nullptr;
    }

    static void* getFocusCallback (void*)
    {
        return GetFocus();
    }

    bool isUsingUpdateLayeredWindow() const
    {
        return ! component.isOpaque();
    }

    bool hasTitleBar() const noexcept        { return (styleFlags & windowHasTitleBar) != 0; }


    void setIcon (const Image& newIcon)
    {
        if (auto hicon = IconConverters::createHICONFromImage (newIcon, TRUE, 0, 0))
        {
            SendMessage (hwnd, WM_SETICON, ICON_BIG, (LPARAM) hicon);
            SendMessage (hwnd, WM_SETICON, ICON_SMALL, (LPARAM) hicon);

            if (currentWindowIcon != 0)
                DestroyIcon (currentWindowIcon);

            currentWindowIcon = hicon;
        }
    }

    void setMessageFilter()
    {
        typedef BOOL (WINAPI* ChangeWindowMessageFilterExFunc) (HWND, UINT, DWORD, PVOID);

        if (auto changeMessageFilter = (ChangeWindowMessageFilterExFunc) getUser32Function ("ChangeWindowMessageFilterEx"))
        {
            changeMessageFilter (hwnd, WM_DROPFILES, 1 /*MSGFLT_ALLOW*/, nullptr);
            changeMessageFilter (hwnd, WM_COPYDATA, 1 /*MSGFLT_ALLOW*/, nullptr);
            changeMessageFilter (hwnd, 0x49, 1 /*MSGFLT_ALLOW*/, nullptr);
        }
    }

    struct ChildWindowClippingInfo
    {
        HDC dc;
        HWNDComponentPeer* peer;
        RectangleList<int>* clip;
        Point<int> origin;
        int savedDC;
    };

    static BOOL CALLBACK clipChildWindowCallback (HWND hwnd, LPARAM context)
    {
        if (IsWindowVisible (hwnd))
        {
            auto& info = *(ChildWindowClippingInfo*) context;

            HWND parent = GetParent (hwnd);

            if (parent == info.peer->hwnd)
            {
                auto r = getWindowRect (hwnd);
                POINT pos = { r.left, r.top };
                ScreenToClient (GetParent (hwnd), &pos);

                Rectangle<int> clip (pos.x, pos.y,
                                     r.right  - r.left,
                                     r.bottom - r.top);

                info.clip->subtract (clip - info.origin);

                if (info.savedDC == 0)
                    info.savedDC = SaveDC (info.dc);

                ExcludeClipRect (info.dc, clip.getX(), clip.getY(), clip.getRight(), clip.getBottom());
            }
        }

        return TRUE;
    }

    //==============================================================================
    void handlePaintMessage()
    {
       #if JUCE_DIRECT2D
        if (direct2DContext != nullptr)
        {
            RECT r;

            if (GetUpdateRect (hwnd, &r, false))
            {
                direct2DContext->start();
                direct2DContext->clipToRectangle (rectangleFromRECT (r));
                handlePaint (*direct2DContext);
                direct2DContext->end();
            }
        }
        else
       #endif
        {
            HRGN rgn = CreateRectRgn (0, 0, 0, 0);
            const int regionType = GetUpdateRgn (hwnd, rgn, false);

            PAINTSTRUCT paintStruct;
            HDC dc = BeginPaint (hwnd, &paintStruct); // Note this can immediately generate a WM_NCPAINT
                                                      // message and become re-entrant, but that's OK

            // if something in a paint handler calls, e.g. a message box, this can become reentrant and
            // corrupt the image it's using to paint into, so do a check here.
            static bool reentrant = false;
            if (! reentrant)
            {
                const ScopedValueSetter<bool> setter (reentrant, true, false);

                if (dontRepaint)
                    component.handleCommandMessage (0); // (this triggers a repaint in the openGL context)
                else
                    performPaint (dc, rgn, regionType, paintStruct);
            }

            DeleteObject (rgn);
            EndPaint (hwnd, &paintStruct);

           #if JUCE_MSVC
            _fpreset(); // because some graphics cards can unmask FP exceptions
           #endif

        }

        lastPaintTime = Time::getMillisecondCounter();
    }

    void performPaint (HDC dc, HRGN rgn, int regionType, PAINTSTRUCT& paintStruct)
    {
        int x = paintStruct.rcPaint.left;
        int y = paintStruct.rcPaint.top;
        int w = paintStruct.rcPaint.right - x;
        int h = paintStruct.rcPaint.bottom - y;

        const bool transparent = isUsingUpdateLayeredWindow();

        if (transparent)
        {
            // it's not possible to have a transparent window with a title bar at the moment!
            jassert (! hasTitleBar());

            auto r = getWindowRect (hwnd);
            x = y = 0;
            w = r.right - r.left;
            h = r.bottom - r.top;
        }

        if (w > 0 && h > 0)
        {
            Image& offscreenImage = offscreenImageGenerator.getImage (transparent, w, h);

            RectangleList<int> contextClip;
            const Rectangle<int> clipBounds (w, h);

            bool needToPaintAll = true;

            if (regionType == COMPLEXREGION && ! transparent)
            {
                HRGN clipRgn = CreateRectRgnIndirect (&paintStruct.rcPaint);
                CombineRgn (rgn, rgn, clipRgn, RGN_AND);
                DeleteObject (clipRgn);

                char rgnData[8192];
                const DWORD res = GetRegionData (rgn, sizeof (rgnData), (RGNDATA*) rgnData);

                if (res > 0 && res <= sizeof (rgnData))
                {
                    const RGNDATAHEADER* const hdr = &(((const RGNDATA*) rgnData)->rdh);

                    if (hdr->iType == RDH_RECTANGLES
                         && hdr->rcBound.right - hdr->rcBound.left >= w
                         && hdr->rcBound.bottom - hdr->rcBound.top >= h)
                    {
                        needToPaintAll = false;

                        auto rects = (const RECT*) (rgnData + sizeof (RGNDATAHEADER));

                        for (int i = (int) ((RGNDATA*) rgnData)->rdh.nCount; --i >= 0;)
                        {
                            if (rects->right <= x + w && rects->bottom <= y + h)
                            {
                                const int cx = jmax (x, (int) rects->left);
                                contextClip.addWithoutMerging (Rectangle<int> (cx - x, rects->top - y,
                                                                               rects->right - cx, rects->bottom - rects->top)
                                                                   .getIntersection (clipBounds));
                            }
                            else
                            {
                                needToPaintAll = true;
                                break;
                            }

                            ++rects;
                        }
                    }
                }
            }

            if (needToPaintAll)
            {
                contextClip.clear();
                contextClip.addWithoutMerging (Rectangle<int> (w, h));
            }

            ChildWindowClippingInfo childClipInfo = { dc, this, &contextClip, Point<int> (x, y), 0 };
            EnumChildWindows (hwnd, clipChildWindowCallback, (LPARAM) &childClipInfo);

            if (! contextClip.isEmpty())
            {
                if (transparent)
                    for (auto& i : contextClip)
                        offscreenImage.clear (i);

                {
                    ScopedPointer<LowLevelGraphicsContext> context (component.getLookAndFeel()
                                                                        .createGraphicsContext (offscreenImage, Point<int> (-x, -y), contextClip));
                    handlePaint (*context);
                }

                static_cast<WindowsBitmapImage*> (offscreenImage.getPixelData())
                    ->blitToWindow (hwnd, dc, transparent, x, y, updateLayeredWindowAlpha);
            }

            if (childClipInfo.savedDC != 0)
                RestoreDC (dc, childClipInfo.savedDC);
        }
    }

    //==============================================================================
    void doMouseEvent (Point<float> position, float pressure, float orientation = 0.0f, ModifierKeys mods = currentModifiers)
    {
        handleMouseEvent (MouseInputSource::InputSourceType::mouse, position, mods, pressure, orientation, getMouseEventTime());
    }

    StringArray getAvailableRenderingEngines() override
    {
        StringArray s ("Software Renderer");

       #if JUCE_DIRECT2D
        if (SystemStats::getOperatingSystemType() >= SystemStats::Windows7)
            s.add ("Direct2D");
       #endif

        return s;
    }

    int getCurrentRenderingEngine() const override    { return currentRenderingEngine; }

   #if JUCE_DIRECT2D
    void updateDirect2DContext()
    {
        if (currentRenderingEngine != direct2DRenderingEngine)
            direct2DContext = nullptr;
        else if (direct2DContext == nullptr)
            direct2DContext = new Direct2DLowLevelGraphicsContext (hwnd);
    }
   #endif

    void setCurrentRenderingEngine (int index) override
    {
        ignoreUnused (index);

       #if JUCE_DIRECT2D
        if (getAvailableRenderingEngines().size() > 1)
        {
            currentRenderingEngine = index == 1 ? direct2DRenderingEngine : softwareRenderingEngine;
            updateDirect2DContext();
            repaint (component.getLocalBounds());
        }
       #endif
    }

    static int getMinTimeBetweenMouseMoves()
    {
        if (SystemStats::getOperatingSystemType() >= SystemStats::WinVista)
            return 0;

        return 1000 / 60;  // Throttling the incoming mouse-events seems to still be needed in XP..
    }

    bool isTouchEvent() noexcept
    {
        if (registerTouchWindow == nullptr)
            return false;

        // Relevant info about touch/pen detection flags:
        // https://msdn.microsoft.com/en-us/library/windows/desktop/ms703320(v=vs.85).aspx
        // http://www.petertissen.de/?p=4

        return (GetMessageExtraInfo() & 0xFFFFFF80 /*SIGNATURE_MASK*/) == 0xFF515780 /*MI_WP_SIGNATURE*/;
    }

    static bool areOtherTouchSourcesActive()
    {
        for (auto& ms : Desktop::getInstance().getMouseSources())
            if (ms.isDragging() && (ms.getType() == MouseInputSource::InputSourceType::touch
                                     || ms.getType() == MouseInputSource::InputSourceType::pen))
                return true;

        return false;
    }

    void doMouseMove (Point<float> position, bool isMouseDownEvent)
    {
        ModifierKeys modsToSend (currentModifiers);

        // this will be handled by WM_TOUCH
        if (isTouchEvent() || areOtherTouchSourcesActive())
            return;

        if (! isMouseOver)
        {
            isMouseOver = true;

            // This avoids a rare stuck-button problem when focus is lost unexpectedly, but must
            // not be called as part of a move, in case it's actually a mouse-drag from another
            // app which ends up here when we get focus before the mouse is released..
            if (isMouseDownEvent)
                ModifierKeys::getCurrentModifiersRealtime();

            updateKeyModifiers();

           #if JUCE_MODULE_AVAILABLE_juce_audio_plugin_client
            if (modProvider != nullptr)
                currentModifiers = currentModifiers.withFlags (modProvider->getWin32Modifiers());
           #endif

            TRACKMOUSEEVENT tme;
            tme.cbSize = sizeof (tme);
            tme.dwFlags = TME_LEAVE;
            tme.hwndTrack = hwnd;
            tme.dwHoverTime = 0;

            if (! TrackMouseEvent (&tme))
                jassertfalse;

            Desktop::getInstance().getMainMouseSource().forceMouseCursorUpdate();
        }
        else if (! isDragging)
        {
            if (! contains (position.roundToInt(), false))
                return;
        }

        static uint32 lastMouseTime = 0;
        static int minTimeBetweenMouses = getMinTimeBetweenMouseMoves();
        const uint32 now = Time::getMillisecondCounter();

        if (! Desktop::getInstance().getMainMouseSource().isDragging())
            modsToSend = modsToSend.withoutMouseButtons();

        if (now >= lastMouseTime + minTimeBetweenMouses)
        {
            lastMouseTime = now;
            doMouseEvent (position, MouseInputSource::invalidPressure,
                          MouseInputSource::invalidOrientation, modsToSend);
        }
    }

    void doMouseDown (Point<float> position, const WPARAM wParam)
    {
        // this will be handled by WM_TOUCH
        if (isTouchEvent() || areOtherTouchSourcesActive())
            return;

        if (GetCapture() != hwnd)
            SetCapture (hwnd);

        doMouseMove (position, true);

        if (isValidPeer (this))
        {
            updateModifiersFromWParam (wParam);

          #if JUCE_MODULE_AVAILABLE_juce_audio_plugin_client
            if (modProvider != nullptr)
                currentModifiers = currentModifiers.withFlags (modProvider->getWin32Modifiers());
          #endif

            isDragging = true;

            doMouseEvent (position, MouseInputSource::invalidPressure);
        }
    }

    void doMouseUp (Point<float> position, const WPARAM wParam)
    {
        // this will be handled by WM_TOUCH
        if (isTouchEvent() || areOtherTouchSourcesActive())
            return;

        updateModifiersFromWParam (wParam);

       #if JUCE_MODULE_AVAILABLE_juce_audio_plugin_client
        if (modProvider != nullptr)
            currentModifiers = currentModifiers.withFlags (modProvider->getWin32Modifiers());
       #endif

        const bool wasDragging = isDragging;
        isDragging = false;

        // release the mouse capture if the user has released all buttons
        if ((wParam & (MK_LBUTTON | MK_RBUTTON | MK_MBUTTON)) == 0 && hwnd == GetCapture())
            ReleaseCapture();

        // NB: under some circumstances (e.g. double-clicking a native title bar), a mouse-up can
        // arrive without a mouse-down, so in that case we need to avoid sending a message.
        if (wasDragging)
            doMouseEvent (position, MouseInputSource::invalidPressure);
    }

    void doCaptureChanged()
    {
        if (constrainerIsResizing)
        {
            if (constrainer != nullptr)
                constrainer->resizeEnd();

            constrainerIsResizing = false;
        }

        if (isDragging)
            doMouseUp (getCurrentMousePos(), (WPARAM) 0);
    }

    void doMouseExit()
    {
        isMouseOver = false;

        if (! areOtherTouchSourcesActive())
            doMouseEvent (getCurrentMousePos(), MouseInputSource::invalidPressure);
    }

    ComponentPeer* findPeerUnderMouse (Point<float>& localPos)
    {
        auto globalPos = getCurrentMousePosGlobal().roundToInt();

        // Because Windows stupidly sends all wheel events to the window with the keyboard
        // focus, we have to redirect them here according to the mouse pos..
        POINT p = { globalPos.x, globalPos.y };
        auto* peer = getOwnerOfWindow (WindowFromPoint (p));

        if (peer == nullptr)
            peer = this;

        localPos = peer->globalToLocal (globalPos.toFloat());
        return peer;
    }

    static MouseInputSource::InputSourceType getPointerType (WPARAM wParam)
    {
        if (getPointerTypeFunction != nullptr)
        {
            POINTER_INPUT_TYPE pointerType;

            if (getPointerTypeFunction (GET_POINTERID_WPARAM (wParam), &pointerType))
            {
                if (pointerType == 2)
                    return MouseInputSource::InputSourceType::touch;

                if (pointerType == 3)
                    return MouseInputSource::InputSourceType::pen;
            }
        }

        return MouseInputSource::InputSourceType::mouse;
    }

    void doMouseWheel (const WPARAM wParam, const bool isVertical)
    {
        updateKeyModifiers();
        const float amount = jlimit (-1000.0f, 1000.0f, 0.5f * (short) HIWORD (wParam));

        MouseWheelDetails wheel;
        wheel.deltaX = isVertical ? 0.0f : amount / -256.0f;
        wheel.deltaY = isVertical ? amount / 256.0f : 0.0f;
        wheel.isReversed = false;
        wheel.isSmooth = false;
        wheel.isInertial = false;

        Point<float> localPos;
        if (auto* peer = findPeerUnderMouse (localPos))
            peer->handleMouseWheel (getPointerType (wParam), localPos, getMouseEventTime(), wheel);
    }

    bool doGestureEvent (LPARAM lParam)
    {
        GESTUREINFO gi;
        zerostruct (gi);
        gi.cbSize = sizeof (gi);

        if (getGestureInfo != nullptr && getGestureInfo ((HGESTUREINFO) lParam, &gi))
        {
            updateKeyModifiers();
            Point<float> localPos;

            if (auto* peer = findPeerUnderMouse (localPos))
            {
                switch (gi.dwID)
                {
                    case 3: /*GID_ZOOM*/
                        if (gi.dwFlags != 1 /*GF_BEGIN*/ && lastMagnifySize > 0)
                            peer->handleMagnifyGesture (MouseInputSource::InputSourceType::touch, localPos, getMouseEventTime(),
                                                        (float) (gi.ullArguments / (double) lastMagnifySize));

                        lastMagnifySize = gi.ullArguments;
                        return true;

                    case 4: /*GID_PAN*/
                    case 5: /*GID_ROTATE*/
                    case 6: /*GID_TWOFINGERTAP*/
                    case 7: /*GID_PRESSANDTAP*/
                    default:
                        break;
                }
            }
        }

        return false;
    }

    LRESULT doTouchEvent (const int numInputs, HTOUCHINPUT eventHandle)
    {
        if ((styleFlags & windowIgnoresMouseClicks) != 0)
            if (auto* parent = getOwnerOfWindow (GetParent (hwnd)))
                if (parent != this)
                    return parent->doTouchEvent (numInputs, eventHandle);

        HeapBlock<TOUCHINPUT> inputInfo (numInputs);

        if (getTouchInputInfo (eventHandle, numInputs, inputInfo, sizeof (TOUCHINPUT)))
        {
            for (int i = 0; i < numInputs; ++i)
            {
                auto flags = inputInfo[i].dwFlags;

                if ((flags & (TOUCHEVENTF_DOWN | TOUCHEVENTF_MOVE | TOUCHEVENTF_UP)) != 0)
                    if (! handleTouchInput (inputInfo[i], (flags & TOUCHEVENTF_DOWN) != 0, (flags & TOUCHEVENTF_UP) != 0))
                        return 0;  // abandon method if this window was deleted by the callback
            }
        }

        closeTouchInputHandle (eventHandle);
        return 0;
    }

    bool handleTouchInput (const TOUCHINPUT& touch, const bool isDown, const bool isUp,
                           const float touchPressure = MouseInputSource::invalidPressure,
                           const float orientation = 0.0f)
    {
        auto isCancel = false;

        const auto touchIndex = currentTouches.getIndexOfTouch (this, touch.dwID);
        const auto time = getMouseEventTime();
        const auto pos = globalToLocal ({ touch.x / 100.0f, touch.y / 100.0f });
        const auto pressure = touchPressure;
        auto modsToSend = currentModifiers;

        if (isDown)
        {
            currentModifiers = currentModifiers.withoutMouseButtons().withFlags (ModifierKeys::leftButtonModifier);
            modsToSend = currentModifiers;

            // this forces a mouse-enter/up event, in case for some reason we didn't get a mouse-up before.
            handleMouseEvent (MouseInputSource::InputSourceType::touch, pos, modsToSend.withoutMouseButtons(),
                              pressure, orientation, time, {}, touchIndex);

            if (! isValidPeer (this)) // (in case this component was deleted by the event)
                return false;
        }
        else if (isUp)
        {
            modsToSend = modsToSend.withoutMouseButtons();
            currentModifiers = modsToSend;
            currentTouches.clearTouch (touchIndex);

            if (! currentTouches.areAnyTouchesActive())
                isCancel = true;
        }
        else
        {
            modsToSend = currentModifiers.withoutMouseButtons().withFlags (ModifierKeys::leftButtonModifier);
        }

        handleMouseEvent (MouseInputSource::InputSourceType::touch, pos, modsToSend,
                          pressure, orientation, time, {}, touchIndex);

        if (! isValidPeer (this))
            return false;

        if (isUp)
        {
            handleMouseEvent (MouseInputSource::InputSourceType::touch, { -10.0f, -10.0f }, currentModifiers.withoutMouseButtons(),
                              pressure, orientation, time, {}, touchIndex);

            if (! isValidPeer (this))
                return false;

            if (isCancel)
            {
                currentTouches.clear();
                currentModifiers = currentModifiers.withoutMouseButtons();
            }
        }

        return true;
    }

    bool handlePointerInput (WPARAM wParam, LPARAM lParam, const bool isDown, const bool isUp)
    {
        if (! canUsePointerAPI)
            return false;

        auto pointerType = getPointerType (wParam);

        if (pointerType == MouseInputSource::InputSourceType::touch)
        {
            POINTER_TOUCH_INFO touchInfo;
            if (! getPointerTouchInfo (GET_POINTERID_WPARAM (wParam), &touchInfo))
                return false;

            const auto pressure = touchInfo.touchMask & TOUCH_MASK_PRESSURE ? touchInfo.pressure
                                                                            : MouseInputSource::invalidPressure;
            const auto orientation = touchInfo.touchMask & TOUCH_MASK_ORIENTATION ? degreesToRadians (static_cast<float> (touchInfo.orientation))
                                                                                  : MouseInputSource::invalidOrientation;

            if (! handleTouchInput (emulateTouchEventFromPointer (lParam, wParam),
                                    isDown, isUp, pressure, orientation))
                return false;
        }
        else if (pointerType == MouseInputSource::InputSourceType::pen)
        {
            POINTER_PEN_INFO penInfo;
            if (! getPointerPenInfo (GET_POINTERID_WPARAM (wParam), &penInfo))
                return false;

            const auto pressure = (penInfo.penMask & PEN_MASK_PRESSURE) ? penInfo.pressure / 1024.0f : MouseInputSource::invalidPressure;

            if (! handlePenInput (penInfo, globalToLocal (Point<float> (static_cast<float> (GET_X_LPARAM(lParam)),
                                                                        static_cast<float> (GET_Y_LPARAM(lParam)))),
                                  pressure, isDown, isUp))
                return false;
        }
        else
        {
            return false;
        }

        return true;
    }

    TOUCHINPUT emulateTouchEventFromPointer (LPARAM lParam, WPARAM wParam)
    {
        TOUCHINPUT touchInput;

        touchInput.dwID = GET_POINTERID_WPARAM (wParam);
        touchInput.x = GET_X_LPARAM (lParam) * 100;
        touchInput.y = GET_Y_LPARAM (lParam) * 100;

        return touchInput;
    }

    bool handlePenInput (POINTER_PEN_INFO penInfo, Point<float> pos, const float pressure, bool isDown, bool isUp)
    {
        const auto time = getMouseEventTime();
        ModifierKeys modsToSend (currentModifiers);
        PenDetails penDetails;

        penDetails.rotation = (penInfo.penMask & PEN_MASK_ROTATION) ? degreesToRadians (static_cast<float> (penInfo.rotation)) : MouseInputSource::invalidRotation;
        penDetails.tiltX = (penInfo.penMask & PEN_MASK_TILT_X) ? penInfo.tiltX / 90.0f : MouseInputSource::invalidTiltX;
        penDetails.tiltY = (penInfo.penMask & PEN_MASK_TILT_Y) ? penInfo.tiltY / 90.0f : MouseInputSource::invalidTiltY;

        auto pInfoFlags = penInfo.pointerInfo.pointerFlags;

        if ((pInfoFlags & POINTER_FLAG_FIRSTBUTTON) != 0)
            currentModifiers = currentModifiers.withoutMouseButtons().withFlags (ModifierKeys::leftButtonModifier);
        else if ((pInfoFlags & POINTER_FLAG_SECONDBUTTON) != 0)
            currentModifiers = currentModifiers.withoutMouseButtons().withFlags (ModifierKeys::rightButtonModifier);

        if (isDown)
        {
            modsToSend = currentModifiers;

            // this forces a mouse-enter/up event, in case for some reason we didn't get a mouse-up before.
            handleMouseEvent (MouseInputSource::InputSourceType::pen, pos, modsToSend.withoutMouseButtons(),
                              pressure, MouseInputSource::invalidOrientation, time, penDetails);

            if (! isValidPeer (this)) // (in case this component was deleted by the event)
                return false;
        }
        else if (isUp || ! (pInfoFlags & POINTER_FLAG_INCONTACT))
        {
            modsToSend = modsToSend.withoutMouseButtons();
        }

        handleMouseEvent (MouseInputSource::InputSourceType::pen, pos, modsToSend, pressure,
                          MouseInputSource::invalidOrientation, time, penDetails);

        if (! isValidPeer (this)) // (in case this component was deleted by the event)
            return false;

        if (isUp)
        {
            handleMouseEvent (MouseInputSource::InputSourceType::pen, { -10.0f, -10.0f }, currentModifiers,
                              pressure, MouseInputSource::invalidOrientation, time, penDetails);

            if (! isValidPeer (this))
                return false;
        }

        return true;
    }

    //==============================================================================
    void sendModifierKeyChangeIfNeeded()
    {
        if (modifiersAtLastCallback != currentModifiers)
        {
            modifiersAtLastCallback = currentModifiers;
            handleModifierKeysChange();
        }
    }

    bool doKeyUp (const WPARAM key)
    {
        updateKeyModifiers();

        switch (key)
        {
            case VK_SHIFT:
            case VK_CONTROL:
            case VK_MENU:
            case VK_CAPITAL:
            case VK_LWIN:
            case VK_RWIN:
            case VK_APPS:
            case VK_NUMLOCK:
            case VK_SCROLL:
            case VK_LSHIFT:
            case VK_RSHIFT:
            case VK_LCONTROL:
            case VK_LMENU:
            case VK_RCONTROL:
            case VK_RMENU:
                sendModifierKeyChangeIfNeeded();
        }

        return handleKeyUpOrDown (false)
                || Component::getCurrentlyModalComponent() != nullptr;
    }

    bool doKeyDown (const WPARAM key)
    {
        updateKeyModifiers();
        bool used = false;

        switch (key)
        {
            case VK_SHIFT:
            case VK_LSHIFT:
            case VK_RSHIFT:
            case VK_CONTROL:
            case VK_LCONTROL:
            case VK_RCONTROL:
            case VK_MENU:
            case VK_LMENU:
            case VK_RMENU:
            case VK_LWIN:
            case VK_RWIN:
            case VK_CAPITAL:
            case VK_NUMLOCK:
            case VK_SCROLL:
            case VK_APPS:
                sendModifierKeyChangeIfNeeded();
                break;

            case VK_LEFT:
            case VK_RIGHT:
            case VK_UP:
            case VK_DOWN:
            case VK_PRIOR:
            case VK_NEXT:
            case VK_HOME:
            case VK_END:
            case VK_DELETE:
            case VK_INSERT:
            case VK_F1:
            case VK_F2:
            case VK_F3:
            case VK_F4:
            case VK_F5:
            case VK_F6:
            case VK_F7:
            case VK_F8:
            case VK_F9:
            case VK_F10:
            case VK_F11:
            case VK_F12:
            case VK_F13:
            case VK_F14:
            case VK_F15:
            case VK_F16:
            case VK_F17:
            case VK_F18:
            case VK_F19:
            case VK_F20:
            case VK_F21:
            case VK_F22:
            case VK_F23:
            case VK_F24:
                used = handleKeyUpOrDown (true);
                used = handleKeyPress (extendedKeyModifier | (int) key, 0) || used;
                break;

            default:
                used = handleKeyUpOrDown (true);

                {
                    MSG msg;
                    if (! PeekMessage (&msg, hwnd, WM_CHAR, WM_DEADCHAR, PM_NOREMOVE))
                    {
                        // if there isn't a WM_CHAR or WM_DEADCHAR message pending, we need to
                        // manually generate the key-press event that matches this key-down.
                        const UINT keyChar  = MapVirtualKey ((UINT) key, 2);
                        const UINT scanCode = MapVirtualKey ((UINT) key, 0);
                        BYTE keyState[256];
                        GetKeyboardState (keyState);

                        WCHAR text[16] = { 0 };
                        if (ToUnicode ((UINT) key, scanCode, keyState, text, 8, 0) != 1)
                            text[0] = 0;

                        used = handleKeyPress ((int) LOWORD (keyChar), (juce_wchar) text[0]) || used;
                    }
                }

                break;
        }

        return used || (Component::getCurrentlyModalComponent() != nullptr);
    }

    bool doKeyChar (int key, const LPARAM flags)
    {
        updateKeyModifiers();

        auto textChar = (juce_wchar) key;
        const int virtualScanCode = (flags >> 16) & 0xff;

        if (key >= '0' && key <= '9')
        {
            switch (virtualScanCode)  // check for a numeric keypad scan-code
            {
                case 0x52:
                case 0x4f:
                case 0x50:
                case 0x51:
                case 0x4b:
                case 0x4c:
                case 0x4d:
                case 0x47:
                case 0x48:
                case 0x49:
                    key = (key - '0') + KeyPress::numberPad0;
                    break;
                default:
                    break;
            }
        }
        else
        {
            // convert the scan code to an unmodified character code..
            const UINT virtualKey = MapVirtualKey ((UINT) virtualScanCode, 1);
            UINT keyChar = MapVirtualKey (virtualKey, 2);

            keyChar = LOWORD (keyChar);

            if (keyChar != 0)
                key = (int) keyChar;

            // avoid sending junk text characters for some control-key combinations
            if (textChar < ' ' && currentModifiers.testFlags (ModifierKeys::ctrlModifier | ModifierKeys::altModifier))
                textChar = 0;
        }

        return handleKeyPress (key, textChar);
    }

    void forwardMessageToParent (UINT message, WPARAM wParam, LPARAM lParam) const
    {
        if (HWND parentH = GetParent (hwnd))
            PostMessage (parentH, message, wParam, lParam);
    }

    bool doAppCommand (const LPARAM lParam)
    {
        int key = 0;

        switch (GET_APPCOMMAND_LPARAM (lParam))
        {
            case APPCOMMAND_MEDIA_PLAY_PAUSE:       key = KeyPress::playKey; break;
            case APPCOMMAND_MEDIA_STOP:             key = KeyPress::stopKey; break;
            case APPCOMMAND_MEDIA_NEXTTRACK:        key = KeyPress::fastForwardKey; break;
            case APPCOMMAND_MEDIA_PREVIOUSTRACK:    key = KeyPress::rewindKey; break;
            default: break;
        }

        if (key != 0)
        {
            updateKeyModifiers();

            if (hwnd == GetActiveWindow())
            {
                handleKeyPress (key, 0);
                return true;
            }
        }

        return false;
    }

    bool isConstrainedNativeWindow() const
    {
        return constrainer != nullptr
                && (styleFlags & (windowHasTitleBar | windowIsResizable)) == (windowHasTitleBar | windowIsResizable)
                && ! isKioskMode();
    }

    Rectangle<int> getCurrentScaledBounds (float scale) const
    {
        return ScalingHelpers::unscaledScreenPosToScaled (scale, windowBorder.addedTo (ScalingHelpers::scaledScreenPosToUnscaled (scale, component.getBounds())));
    }

    LRESULT handleSizeConstraining (RECT& r, const WPARAM wParam)
    {
        if (isConstrainedNativeWindow())
        {
            auto scale = getComponent().getDesktopScaleFactor();
            auto pos = ScalingHelpers::unscaledScreenPosToScaled (scale, rectangleFromRECT (r));
            auto current = getCurrentScaledBounds (scale);

            constrainer->checkBounds (pos, current,
                                      Desktop::getInstance().getDisplays().getTotalBounds (true),
                                      wParam == WMSZ_TOP    || wParam == WMSZ_TOPLEFT    || wParam == WMSZ_TOPRIGHT,
                                      wParam == WMSZ_LEFT   || wParam == WMSZ_TOPLEFT    || wParam == WMSZ_BOTTOMLEFT,
                                      wParam == WMSZ_BOTTOM || wParam == WMSZ_BOTTOMLEFT || wParam == WMSZ_BOTTOMRIGHT,
                                      wParam == WMSZ_RIGHT  || wParam == WMSZ_TOPRIGHT   || wParam == WMSZ_BOTTOMRIGHT);

            pos = ScalingHelpers::scaledScreenPosToUnscaled (scale, pos);
            r.left   = pos.getX();
            r.top    = pos.getY();
            r.right  = pos.getRight();
            r.bottom = pos.getBottom();
        }

        return TRUE;
    }

    LRESULT handlePositionChanging (WINDOWPOS& wp)
    {
        if (isConstrainedNativeWindow())
        {
            if ((wp.flags & (SWP_NOMOVE | SWP_NOSIZE)) != (SWP_NOMOVE | SWP_NOSIZE)
                 && ! Component::isMouseButtonDownAnywhere())
            {
                auto scale = getComponent().getDesktopScaleFactor();
                auto pos = ScalingHelpers::unscaledScreenPosToScaled (scale, Rectangle<int> (wp.x, wp.y, wp.cx, wp.cy));
                auto current = getCurrentScaledBounds (scale);

                constrainer->checkBounds (pos, current,
                                          Desktop::getInstance().getDisplays().getTotalBounds (true),
                                          pos.getY() != current.getY() && pos.getBottom() == current.getBottom(),
                                          pos.getX() != current.getX() && pos.getRight()  == current.getRight(),
                                          pos.getY() == current.getY() && pos.getBottom() != current.getBottom(),
                                          pos.getX() == current.getX() && pos.getRight()  != current.getRight());

                pos = ScalingHelpers::scaledScreenPosToUnscaled (scale, pos);
                wp.x = pos.getX();
                wp.y = pos.getY();
                wp.cx = pos.getWidth();
                wp.cy = pos.getHeight();
            }
        }

        if (((wp.flags & SWP_SHOWWINDOW) != 0 && ! component.isVisible()))
            component.setVisible (true);
        else if (((wp.flags & SWP_HIDEWINDOW) != 0 && component.isVisible()))
            component.setVisible (false);

        return 0;
    }

    bool handlePositionChanged()
    {
        auto pos = getCurrentMousePos();

        if (contains (pos.roundToInt(), false))
        {
            if (! areOtherTouchSourcesActive())
                doMouseEvent (pos, MouseInputSource::invalidPressure);

            if (! isValidPeer (this))
                return true;
        }

        handleMovedOrResized();
        return ! dontRepaint; // to allow non-accelerated openGL windows to draw themselves correctly..
    }

    void handleAppActivation (const WPARAM wParam)
    {
        modifiersAtLastCallback = -1;
        updateKeyModifiers();

        if (isMinimised())
        {
            component.repaint();
            handleMovedOrResized();

            if (! isValidPeer (this))
                return;
        }

        auto* underMouse = component.getComponentAt (component.getMouseXYRelative());

        if (underMouse == nullptr)
            underMouse = &component;

        if (underMouse->isCurrentlyBlockedByAnotherModalComponent())
        {
            if (LOWORD (wParam) == WA_CLICKACTIVE)
                Component::getCurrentlyModalComponent()->inputAttemptWhenModal();
            else
                ModalComponentManager::getInstance()->bringModalComponentsToFront();
        }
        else
        {
            handleBroughtToFront();
        }
    }

    void handlePowerBroadcast (WPARAM wParam)
    {
        if (auto* app = JUCEApplicationBase::getInstance())
        {
            switch (wParam)
            {
                case PBT_APMSUSPEND:                app->suspended(); break;

                case PBT_APMQUERYSUSPENDFAILED:
                case PBT_APMRESUMECRITICAL:
                case PBT_APMRESUMESUSPEND:
                case PBT_APMRESUMEAUTOMATIC:        app->resumed(); break;

                default: break;
            }
        }
    }

    void handleLeftClickInNCArea (WPARAM wParam)
    {
        if (! sendInputAttemptWhenModalMessage())
        {
            switch (wParam)
            {
            case HTBOTTOM:
            case HTBOTTOMLEFT:
            case HTBOTTOMRIGHT:
            case HTGROWBOX:
            case HTLEFT:
            case HTRIGHT:
            case HTTOP:
            case HTTOPLEFT:
            case HTTOPRIGHT:
                if (isConstrainedNativeWindow())
                {
                    constrainerIsResizing = true;
                    constrainer->resizeStart();
                }
                break;

            default:
                break;
            }
        }
    }

    void initialiseSysMenu (HMENU menu) const
    {
        if (! hasTitleBar())
        {
            if (isFullScreen())
            {
                EnableMenuItem (menu, SC_RESTORE,  MF_BYCOMMAND | MF_ENABLED);
                EnableMenuItem (menu, SC_MOVE,     MF_BYCOMMAND | MF_GRAYED);
            }
            else if (! isMinimised())
            {
                EnableMenuItem (menu, SC_MAXIMIZE, MF_BYCOMMAND | MF_GRAYED);
            }
        }
    }

    void doSettingChange()
    {
        auto& desktop = Desktop::getInstance();

        const_cast<Desktop::Displays&> (desktop.getDisplays()).refresh();

        if (fullScreen && ! isMinimised())
        {
            auto& display = desktop.getDisplays().getDisplayContaining (component.getScreenBounds().getCentre());

            setWindowPos (hwnd, display.userArea * display.scale,
                          SWP_NOACTIVATE | SWP_NOOWNERZORDER | SWP_NOZORDER | SWP_NOSENDCHANGING);
        }
    }

    void handleDPIChange() // happens when a window moves to a screen with a different DPI.
    {
    }

    //==============================================================================
  #if JUCE_MODULE_AVAILABLE_juce_audio_plugin_client
    void setModifierKeyProvider (ModifierKeyProvider* provider) override
    {
        modProvider = provider;
    }

    void removeModifierKeyProvider() override
    {
        modProvider = nullptr;
    }
   #endif

    //==============================================================================
public:
    static LRESULT CALLBACK windowProc (HWND h, UINT message, WPARAM wParam, LPARAM lParam)
    {
        if (auto* peer = getOwnerOfWindow (h))
        {
            jassert (isValidPeer (peer));
            return peer->peerWindowProc (h, message, wParam, lParam);
        }

        return DefWindowProcW (h, message, wParam, lParam);
    }

private:
    static void* callFunctionIfNotLocked (MessageCallbackFunction* callback, void* userData)
    {
        auto& mm = *MessageManager::getInstance();

        if (mm.currentThreadHasLockedMessageManager())
            return callback (userData);

        return mm.callFunctionOnMessageThread (callback, userData);
    }

    static Point<float> getPointFromLParam (LPARAM lParam) noexcept
    {
        return { static_cast<float> (GET_X_LPARAM (lParam)),
                 static_cast<float> (GET_Y_LPARAM (lParam)) };
    }

    static Point<float> getCurrentMousePosGlobal() noexcept
    {
        return getPointFromLParam (GetMessagePos());
    }

    Point<float> getCurrentMousePos() noexcept
    {
        return globalToLocal (getCurrentMousePosGlobal());
    }

    LRESULT peerWindowProc (HWND h, UINT message, WPARAM wParam, LPARAM lParam)
    {
        switch (message)
        {
            //==============================================================================
            case WM_NCHITTEST:
                if ((styleFlags & windowIgnoresMouseClicks) != 0)
                    return HTTRANSPARENT;

                if (! hasTitleBar())
                    return HTCLIENT;

                break;

            //==============================================================================
            case WM_PAINT:
                handlePaintMessage();
                return 0;

            case WM_NCPAINT:
                if (wParam != 1) // (1 = a repaint of the entire NC region)
                    handlePaintMessage(); // this must be done, even with native titlebars, or there are rendering artifacts.

                if (hasTitleBar())
                    break; // let the DefWindowProc handle drawing the frame.

                return 0;

            case WM_ERASEBKGND:
            case WM_NCCALCSIZE:
                if (hasTitleBar())
                    break;

                return 1;

            //==============================================================================
            case WM_POINTERUPDATE:
                if (handlePointerInput (wParam, lParam, false, false))
                    return 0;
                break;

            case WM_POINTERDOWN:
                if (handlePointerInput (wParam, lParam, true, false))
                    return 0;
                break;

            case WM_POINTERUP:
                if (handlePointerInput (wParam, lParam, false, true))
                    return 0;
                break;

            //==============================================================================
            case WM_MOUSEMOVE:          doMouseMove (getPointFromLParam (lParam), false); return 0;

            case WM_POINTERLEAVE:
            case WM_MOUSELEAVE:         doMouseExit(); return 0;

            case WM_LBUTTONDOWN:
            case WM_MBUTTONDOWN:
            case WM_RBUTTONDOWN:        doMouseDown (getPointFromLParam (lParam), wParam); return 0;

            case WM_LBUTTONUP:
            case WM_MBUTTONUP:
            case WM_RBUTTONUP:          doMouseUp (getPointFromLParam (lParam), wParam); return 0;

            case WM_POINTERWHEEL:
            case 0x020A: /* WM_MOUSEWHEEL */   doMouseWheel (wParam, true);  return 0;

            case WM_POINTERHWHEEL:
            case 0x020E: /* WM_MOUSEHWHEEL */  doMouseWheel (wParam, false); return 0;

            case WM_CAPTURECHANGED:     doCaptureChanged(); return 0;

            case WM_NCPOINTERUPDATE:
            case WM_NCMOUSEMOVE:
                if (hasTitleBar())
                    break;

                return 0;

            case WM_TOUCH:
                if (getTouchInputInfo != nullptr)
                    return doTouchEvent ((int) wParam, (HTOUCHINPUT) lParam);

                break;

            case 0x119: /* WM_GESTURE */
                if (doGestureEvent (lParam))
                    return 0;

                break;

            //==============================================================================
            case WM_SIZING:                return handleSizeConstraining (*(RECT*) lParam, wParam);
            case WM_WINDOWPOSCHANGING:     return handlePositionChanging (*(WINDOWPOS*) lParam);

            case WM_WINDOWPOSCHANGED:
            {
                const WINDOWPOS& wPos = *reinterpret_cast<WINDOWPOS*> (lParam);

                if ((wPos.flags & SWP_NOMOVE) != 0 && (wPos.flags & SWP_NOSIZE) != 0)
                    startTimer(100);
                else
                    if (handlePositionChanged())
                        return 0;
            }
            break;

            //==============================================================================
            case WM_KEYDOWN:
            case WM_SYSKEYDOWN:
                if (doKeyDown (wParam))
                    return 0;

                forwardMessageToParent (message, wParam, lParam);
                break;

            case WM_KEYUP:
            case WM_SYSKEYUP:
                if (doKeyUp (wParam))
                    return 0;

                forwardMessageToParent (message, wParam, lParam);
                break;

            case WM_CHAR:
                if (doKeyChar ((int) wParam, lParam))
                    return 0;

                forwardMessageToParent (message, wParam, lParam);
                break;

            case WM_APPCOMMAND:
                if (doAppCommand (lParam))
                    return TRUE;

                break;

            case WM_MENUCHAR: // triggered when alt+something is pressed
                return MNC_CLOSE << 16; // (avoids making the default system beep)

            //==============================================================================
            case WM_SETFOCUS:
                updateKeyModifiers();
                handleFocusGain();
                break;

            case WM_KILLFOCUS:
                if (hasCreatedCaret)
                {
                    hasCreatedCaret = false;
                    DestroyCaret();
                }

                handleFocusLoss();
                break;

            case WM_ACTIVATEAPP:
                // Windows does weird things to process priority when you swap apps,
                // so this forces an update when the app is brought to the front
                if (wParam != FALSE)
                    juce_repeatLastProcessPriority();
                else
                    Desktop::getInstance().setKioskModeComponent (nullptr); // turn kiosk mode off if we lose focus

                juce_checkCurrentlyFocusedTopLevelWindow();
                modifiersAtLastCallback = -1;
                return 0;

            case WM_ACTIVATE:
                if (LOWORD (wParam) == WA_ACTIVE || LOWORD (wParam) == WA_CLICKACTIVE)
                {
                    handleAppActivation (wParam);
                    return 0;
                }

                break;

            case WM_NCACTIVATE:
                // while a temporary window is being shown, prevent Windows from deactivating the
                // title bars of our main windows.
                if (wParam == 0 && ! shouldDeactivateTitleBar)
                    wParam = TRUE; // change this and let it get passed to the DefWindowProc.

                break;

            case WM_POINTERACTIVATE:
            case WM_MOUSEACTIVATE:
                if (! component.getMouseClickGrabsKeyboardFocus())
                    return MA_NOACTIVATE;

                break;

            case WM_SHOWWINDOW:
                if (wParam != 0)
                {
                    component.setVisible (true);
                    handleBroughtToFront();
                }

                break;

            case WM_CLOSE:
                if (! component.isCurrentlyBlockedByAnotherModalComponent())
                    handleUserClosingWindow();

                return 0;

           #if JUCE_REMOVE_COMPONENT_FROM_DESKTOP_ON_WM_DESTROY
            case WM_DESTROY:
                getComponent().removeFromDesktop();
                return 0;
           #endif

            case WM_QUERYENDSESSION:
                if (auto* app = JUCEApplicationBase::getInstance())
                {
                    app->systemRequestedQuit();
                    return MessageManager::getInstance()->hasStopMessageBeenSent();
                }
                return TRUE;

            case WM_POWERBROADCAST:
                handlePowerBroadcast (wParam);
                break;

            case WM_SYNCPAINT:
                return 0;

            case WM_DISPLAYCHANGE:
                InvalidateRect (h, 0, 0);
                // intentional fall-through...
            case WM_SETTINGCHANGE:  // note the fall-through in the previous case!
                doSettingChange();
                break;

            case 0x2e0: // WM_DPICHANGED
                handleDPIChange();
                break;

            case WM_INITMENU:
                initialiseSysMenu ((HMENU) wParam);
                break;

            case WM_SYSCOMMAND:
                switch (wParam & 0xfff0)
                {
                case SC_CLOSE:
                    if (sendInputAttemptWhenModalMessage())
                        return 0;

                    if (hasTitleBar())
                    {
                        PostMessage (h, WM_CLOSE, 0, 0);
                        return 0;
                    }
                    break;

                case SC_KEYMENU:
                   #if ! JUCE_WINDOWS_ALT_KEY_TRIGGERS_MENU
                    // This test prevents a press of the ALT key from triggering the ancient top-left window menu.
                    // By default we suppress this behaviour because it's unlikely that more than a tiny subset of
                    // our users will actually want it, and it causes problems if you're trying to use the ALT key
                    // as a modifier for mouse actions. If you really need the old behaviour, then just define
                    // JUCE_WINDOWS_ALT_KEY_TRIGGERS_MENU=1 in your app.
                    if ((lParam >> 16) <= 0) // Values above zero indicate that a mouse-click triggered the menu
                        return 0;
                   #endif

                    // (NB mustn't call sendInputAttemptWhenModalMessage() here because of very obscure
                    // situations that can arise if a modal loop is started from an alt-key keypress).
                    if (hasTitleBar() && h == GetCapture())
                        ReleaseCapture();

                    break;

                case SC_MAXIMIZE:
                    if (! sendInputAttemptWhenModalMessage())
                        setFullScreen (true);

                    return 0;

                case SC_MINIMIZE:
                    if (sendInputAttemptWhenModalMessage())
                        return 0;

                    if (! hasTitleBar())
                    {
                        setMinimised (true);
                        return 0;
                    }
                    break;

                case SC_RESTORE:
                    if (sendInputAttemptWhenModalMessage())
                        return 0;

                    if (hasTitleBar())
                    {
                        if (isFullScreen())
                        {
                            setFullScreen (false);
                            return 0;
                        }
                    }
                    else
                    {
                        if (isMinimised())
                            setMinimised (false);
                        else if (isFullScreen())
                            setFullScreen (false);

                        return 0;
                    }
                    break;
                }

                break;

            case WM_NCPOINTERDOWN:
            case WM_NCLBUTTONDOWN:
                handleLeftClickInNCArea (wParam);
                break;

            case WM_NCRBUTTONDOWN:
            case WM_NCMBUTTONDOWN:
                sendInputAttemptWhenModalMessage();
                break;

            case WM_IME_SETCONTEXT:
                imeHandler.handleSetContext (h, wParam == TRUE);
                lParam &= ~ISC_SHOWUICOMPOSITIONWINDOW;
                break;

            case WM_IME_STARTCOMPOSITION:  imeHandler.handleStartComposition (*this); return 0;
            case WM_IME_ENDCOMPOSITION:    imeHandler.handleEndComposition (*this, h); break;
            case WM_IME_COMPOSITION:       imeHandler.handleComposition (*this, h, lParam); return 0;

            case WM_GETDLGCODE:
                return DLGC_WANTALLKEYS;

            default:
                break;
        }

        return DefWindowProcW (h, message, wParam, lParam);
    }

    bool sendInputAttemptWhenModalMessage()
    {
        if (component.isCurrentlyBlockedByAnotherModalComponent())
        {
            if (Component* const current = Component::getCurrentlyModalComponent())
                current->inputAttemptWhenModal();

            return true;
        }

        return false;
    }

    //==============================================================================
    struct IMEHandler
    {
        IMEHandler()
        {
            reset();
        }

        void handleSetContext (HWND hWnd, const bool windowIsActive)
        {
            if (compositionInProgress && ! windowIsActive)
            {
                compositionInProgress = false;

                if (HIMC hImc = ImmGetContext (hWnd))
                {
                    ImmNotifyIME (hImc, NI_COMPOSITIONSTR, CPS_COMPLETE, 0);
                    ImmReleaseContext (hWnd, hImc);
                }
            }
        }

        void handleStartComposition (ComponentPeer& owner)
        {
            reset();

            if (auto* target = owner.findCurrentTextInputTarget())
                target->insertTextAtCaret (String());
        }

        void handleEndComposition (ComponentPeer& owner, HWND hWnd)
        {
            if (compositionInProgress)
            {
                // If this occurs, the user has cancelled the composition, so clear their changes..
                if (auto* target = owner.findCurrentTextInputTarget())
                {
                    target->setHighlightedRegion (compositionRange);
                    target->insertTextAtCaret (String());
                    compositionRange.setLength (0);

                    target->setHighlightedRegion (Range<int>::emptyRange (compositionRange.getEnd()));
                    target->setTemporaryUnderlining ({});
                }

                if (auto hImc = ImmGetContext (hWnd))
                {
                    ImmNotifyIME (hImc, NI_CLOSECANDIDATE, 0, 0);
                    ImmReleaseContext (hWnd, hImc);
                }
            }

            reset();
        }

        void handleComposition (ComponentPeer& owner, HWND hWnd, const LPARAM lParam)
        {
            if (auto* target = owner.findCurrentTextInputTarget())
            {
                if (auto hImc = ImmGetContext (hWnd))
                {
                    if (compositionRange.getStart() < 0)
                        compositionRange = Range<int>::emptyRange (target->getHighlightedRegion().getStart());

                    if ((lParam & GCS_RESULTSTR) != 0) // (composition has finished)
                    {
                        replaceCurrentSelection (target, getCompositionString (hImc, GCS_RESULTSTR),
                                                 Range<int>::emptyRange (-1));

                        reset();
                        target->setTemporaryUnderlining ({});
                    }
                    else if ((lParam & GCS_COMPSTR) != 0) // (composition is still in-progress)
                    {
                        replaceCurrentSelection (target, getCompositionString (hImc, GCS_COMPSTR),
                                                 getCompositionSelection (hImc, lParam));

                        target->setTemporaryUnderlining (getCompositionUnderlines (hImc, lParam));
                        compositionInProgress = true;
                    }

                    moveCandidateWindowToLeftAlignWithSelection (hImc, owner, target);
                    ImmReleaseContext (hWnd, hImc);
                }
            }
        }

    private:
        //==============================================================================
        Range<int> compositionRange; // The range being modified in the TextInputTarget
        bool compositionInProgress;

        //==============================================================================
        void reset()
        {
            compositionRange = Range<int>::emptyRange (-1);
            compositionInProgress = false;
        }

        String getCompositionString (HIMC hImc, const DWORD type) const
        {
            jassert (hImc != 0);

            const int stringSizeBytes = ImmGetCompositionString (hImc, type, 0, 0);

            if (stringSizeBytes > 0)
            {
                HeapBlock<TCHAR> buffer;
                buffer.calloc (stringSizeBytes / sizeof (TCHAR) + 1);
                ImmGetCompositionString (hImc, type, buffer, (DWORD) stringSizeBytes);
                return String (buffer.get());
            }

            return {};
        }

        int getCompositionCaretPos (HIMC hImc, LPARAM lParam, const String& currentIMEString) const
        {
            jassert (hImc != 0);

            if ((lParam & CS_NOMOVECARET) != 0)
                return compositionRange.getStart();

            if ((lParam & GCS_CURSORPOS) != 0)
            {
                const int localCaretPos = ImmGetCompositionString (hImc, GCS_CURSORPOS, 0, 0);
                return compositionRange.getStart() + jmax (0, localCaretPos);
            }

            return compositionRange.getStart() + currentIMEString.length();
        }

        // Get selected/highlighted range while doing composition:
        // returned range is relative to beginning of TextInputTarget, not composition string
        Range<int> getCompositionSelection (HIMC hImc, LPARAM lParam) const
        {
            jassert (hImc != 0);
            int selectionStart = 0;
            int selectionEnd = 0;

            if ((lParam & GCS_COMPATTR) != 0)
            {
                // Get size of attributes array:
                const int attributeSizeBytes = ImmGetCompositionString (hImc, GCS_COMPATTR, 0, 0);

                if (attributeSizeBytes > 0)
                {
                    // Get attributes (8 bit flag per character):
                    HeapBlock<char> attributes (attributeSizeBytes);
                    ImmGetCompositionString (hImc, GCS_COMPATTR, attributes, (DWORD) attributeSizeBytes);

                    selectionStart = 0;

                    for (selectionStart = 0; selectionStart < attributeSizeBytes; ++selectionStart)
                        if (attributes[selectionStart] == ATTR_TARGET_CONVERTED || attributes[selectionStart] == ATTR_TARGET_NOTCONVERTED)
                            break;

                    for (selectionEnd = selectionStart; selectionEnd < attributeSizeBytes; ++selectionEnd)
                        if (attributes [selectionEnd] != ATTR_TARGET_CONVERTED && attributes[selectionEnd] != ATTR_TARGET_NOTCONVERTED)
                            break;
                }
            }

            return Range<int> (selectionStart, selectionEnd) + compositionRange.getStart();
        }

        void replaceCurrentSelection (TextInputTarget* const target, const String& newContent, Range<int> newSelection)
        {
            if (compositionInProgress)
                target->setHighlightedRegion (compositionRange);

            target->insertTextAtCaret (newContent);
            compositionRange.setLength (newContent.length());

            if (newSelection.getStart() < 0)
                newSelection = Range<int>::emptyRange (compositionRange.getEnd());

            target->setHighlightedRegion (newSelection);
        }

        Array<Range<int>> getCompositionUnderlines (HIMC hImc, LPARAM lParam) const
        {
            Array<Range<int>> result;

            if (hImc != 0 && (lParam & GCS_COMPCLAUSE) != 0)
            {
                auto clauseDataSizeBytes = ImmGetCompositionString (hImc, GCS_COMPCLAUSE, 0, 0);

                if (clauseDataSizeBytes > 0)
                {
                    const size_t numItems = clauseDataSizeBytes / sizeof (uint32);
                    HeapBlock<uint32> clauseData (numItems);

                    if (ImmGetCompositionString (hImc, GCS_COMPCLAUSE, clauseData, (DWORD) clauseDataSizeBytes) > 0)
                        for (size_t i = 0; i + 1 < numItems; ++i)
                            result.add (Range<int> ((int) clauseData [i], (int) clauseData [i + 1]) + compositionRange.getStart());
                }
            }

            return result;
        }

        void moveCandidateWindowToLeftAlignWithSelection (HIMC hImc, ComponentPeer& peer, TextInputTarget* target) const
        {
            if (auto* targetComp = dynamic_cast<Component*> (target))
            {
                auto area = peer.getComponent().getLocalArea (targetComp, target->getCaretRectangle());

                CANDIDATEFORM pos = { 0, CFS_CANDIDATEPOS, { area.getX(), area.getBottom() }, { 0, 0, 0, 0 } };
                ImmSetCandidateWindow (hImc, &pos);
            }
        }

        JUCE_DECLARE_NON_COPYABLE (IMEHandler)
    };

    void timerCallback() override
    {
        handlePositionChanged();
        stopTimer();
    }

    IMEHandler imeHandler;

    //==============================================================================
    JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (HWNDComponentPeer)
};

ModifierKeys HWNDComponentPeer::currentModifiers;
ModifierKeys HWNDComponentPeer::modifiersAtLastCallback;

MultiTouchMapper<DWORD> HWNDComponentPeer::currentTouches;

ComponentPeer* Component::createNewPeer (int styleFlags, void* parentHWND)
{
    return new HWNDComponentPeer (*this, styleFlags, (HWND) parentHWND, false);
}

JUCE_API ComponentPeer* createNonRepaintingEmbeddedWindowsPeer (Component& component, void* parentHWND)
{
    return new HWNDComponentPeer (component, ComponentPeer::windowIgnoresMouseClicks,
                                  (HWND) parentHWND, true);
}


JUCE_IMPLEMENT_SINGLETON (HWNDComponentPeer::WindowClassHolder)


//==============================================================================
void ModifierKeys::updateCurrentModifiers() noexcept
{
    currentModifiers = HWNDComponentPeer::currentModifiers;
}

ModifierKeys ModifierKeys::getCurrentModifiersRealtime() noexcept
{
    HWNDComponentPeer::updateKeyModifiers();

    int mouseMods = 0;
    if (HWNDComponentPeer::isKeyDown (VK_LBUTTON))  mouseMods |= ModifierKeys::leftButtonModifier;
    if (HWNDComponentPeer::isKeyDown (VK_RBUTTON))  mouseMods |= ModifierKeys::rightButtonModifier;
    if (HWNDComponentPeer::isKeyDown (VK_MBUTTON))  mouseMods |= ModifierKeys::middleButtonModifier;

    HWNDComponentPeer::currentModifiers
        = HWNDComponentPeer::currentModifiers.withoutMouseButtons().withFlags (mouseMods);

    return HWNDComponentPeer::currentModifiers;
}

//==============================================================================
bool KeyPress::isKeyCurrentlyDown (const int keyCode)
{
    auto k = (SHORT) keyCode;

    if ((keyCode & extendedKeyModifier) == 0)
    {
        if (k >= (SHORT) 'a' && k <= (SHORT) 'z')
            k += (SHORT) 'A' - (SHORT) 'a';

        // Only translate if extendedKeyModifier flag is not set
        const SHORT translatedValues[] = { (SHORT) ',', VK_OEM_COMMA,
                                           (SHORT) '+', VK_OEM_PLUS,
                                           (SHORT) '-', VK_OEM_MINUS,
                                           (SHORT) '.', VK_OEM_PERIOD,
                                           (SHORT) ';', VK_OEM_1,
                                           (SHORT) ':', VK_OEM_1,
                                           (SHORT) '/', VK_OEM_2,
                                           (SHORT) '?', VK_OEM_2,
                                           (SHORT) '[', VK_OEM_4,
                                           (SHORT) ']', VK_OEM_6 };

        for (int i = 0; i < numElementsInArray (translatedValues); i += 2)
            if (k == translatedValues [i])
                k = translatedValues [i + 1];
    }

    return HWNDComponentPeer::isKeyDown (k);
}

// (This internal function is used by the plugin client module)
bool offerKeyMessageToJUCEWindow (MSG& m)   { return HWNDComponentPeer::offerKeyMessageToJUCEWindow (m); }

//==============================================================================
bool JUCE_CALLTYPE Process::isForegroundProcess()
{
    if (auto fg = GetForegroundWindow())
    {
        DWORD processID = 0;
        GetWindowThreadProcessId (fg, &processID);

        return processID == GetCurrentProcessId();
    }

    return true;
}

// N/A on Windows as far as I know.
void JUCE_CALLTYPE Process::makeForegroundProcess() {}
void JUCE_CALLTYPE Process::hide() {}

//==============================================================================
static BOOL CALLBACK enumAlwaysOnTopWindows (HWND hwnd, LPARAM lParam)
{
    if (IsWindowVisible (hwnd))
    {
        DWORD processID = 0;
        GetWindowThreadProcessId (hwnd, &processID);

        if (processID == GetCurrentProcessId())
        {
            WINDOWINFO info;

            if (GetWindowInfo (hwnd, &info)
                 && (info.dwExStyle & WS_EX_TOPMOST) != 0)
            {
                *reinterpret_cast<bool*> (lParam) = true;
                return FALSE;
            }
        }
    }

    return TRUE;
}

bool juce_areThereAnyAlwaysOnTopWindows()
{
    bool anyAlwaysOnTopFound = false;
    EnumWindows (&enumAlwaysOnTopWindows, (LPARAM) &anyAlwaysOnTopFound);
    return anyAlwaysOnTopFound;
}

//==============================================================================
class WindowsMessageBox  : public AsyncUpdater
{
public:
    WindowsMessageBox (AlertWindow::AlertIconType iconType,
                       const String& boxTitle, const String& m,
                       Component* associatedComponent, UINT extraFlags,
                       ModalComponentManager::Callback* cb, const bool runAsync)
        : flags (extraFlags | getMessageBoxFlags (iconType)),
          owner (getWindowForMessageBox (associatedComponent)),
          title (boxTitle), message (m), callback (cb)
    {
        if (runAsync)
            triggerAsyncUpdate();
    }

    int getResult() const
    {
        const int r = MessageBox (owner, message.toWideCharPointer(), title.toWideCharPointer(), flags);
        return (r == IDYES || r == IDOK) ? 1 : (r == IDNO && (flags & 1) != 0 ? 2 : 0);
    }

    void handleAsyncUpdate() override
    {
        const int result = getResult();

        if (callback != nullptr)
            callback->modalStateFinished (result);

        delete this;
    }

private:
    UINT flags;
    HWND owner;
    String title, message;
    ScopedPointer<ModalComponentManager::Callback> callback;

    static UINT getMessageBoxFlags (AlertWindow::AlertIconType iconType) noexcept
    {
        UINT flags = MB_TASKMODAL | MB_SETFOREGROUND;

        switch (iconType)
        {
            case AlertWindow::QuestionIcon:  flags |= MB_ICONQUESTION; break;
            case AlertWindow::WarningIcon:   flags |= MB_ICONWARNING; break;
            case AlertWindow::InfoIcon:      flags |= MB_ICONINFORMATION; break;
            default: break;
        }

        return flags;
    }

    static HWND getWindowForMessageBox (Component* associatedComponent)
    {
        return associatedComponent != nullptr ? (HWND) associatedComponent->getWindowHandle() : 0;
    }
};

#if JUCE_MODAL_LOOPS_PERMITTED
void JUCE_CALLTYPE NativeMessageBox::showMessageBox (AlertWindow::AlertIconType iconType,
                                                     const String& title, const String& message,
                                                     Component* associatedComponent)
{
    WindowsMessageBox box (iconType, title, message, associatedComponent, MB_OK, 0, false);
    (void) box.getResult();
}
#endif

void JUCE_CALLTYPE NativeMessageBox::showMessageBoxAsync (AlertWindow::AlertIconType iconType,
                                                          const String& title, const String& message,
                                                          Component* associatedComponent,
                                                          ModalComponentManager::Callback* callback)
{
    new WindowsMessageBox (iconType, title, message, associatedComponent, MB_OK, callback, true);
}

bool JUCE_CALLTYPE NativeMessageBox::showOkCancelBox (AlertWindow::AlertIconType iconType,
                                                      const String& title, const String& message,
                                                      Component* associatedComponent,
                                                      ModalComponentManager::Callback* callback)
{
    ScopedPointer<WindowsMessageBox> mb (new WindowsMessageBox (iconType, title, message, associatedComponent,
                                                                MB_OKCANCEL, callback, callback != nullptr));
    if (callback == nullptr)
        return mb->getResult() != 0;

    mb.release();
    return false;
}

int JUCE_CALLTYPE NativeMessageBox::showYesNoCancelBox (AlertWindow::AlertIconType iconType,
                                                        const String& title, const String& message,
                                                        Component* associatedComponent,
                                                        ModalComponentManager::Callback* callback)
{
    ScopedPointer<WindowsMessageBox> mb (new WindowsMessageBox (iconType, title, message, associatedComponent,
                                                                MB_YESNOCANCEL, callback, callback != nullptr));
    if (callback == nullptr)
        return mb->getResult();

    mb.release();
    return 0;
}

int JUCE_CALLTYPE NativeMessageBox::showYesNoBox (AlertWindow::AlertIconType iconType,
                                                  const String& title, const String& message,
                                                  Component* associatedComponent,
                                                  ModalComponentManager::Callback* callback)
{
    ScopedPointer<WindowsMessageBox> mb (new WindowsMessageBox (iconType, title, message, associatedComponent,
                                                                MB_YESNO, callback, callback != nullptr));
    if (callback == nullptr)
        return mb->getResult();

    mb.release();
    return 0;
}

//==============================================================================
bool MouseInputSource::SourceList::addSource()
{
    auto numSources = sources.size();

    if (numSources == 0 || canUseMultiTouch())
    {
        addSource (numSources, numSources == 0 ? MouseInputSource::InputSourceType::mouse
                                               : MouseInputSource::InputSourceType::touch);
        return true;
    }

    return false;
}

bool MouseInputSource::SourceList::canUseTouch()
{
    return canUseMultiTouch();
}

Point<float> MouseInputSource::getCurrentRawMousePosition()
{
    POINT mousePos;
    GetCursorPos (&mousePos);
    return { (float) mousePos.x, (float) mousePos.y };
}

void MouseInputSource::setRawMousePosition (Point<float> newPosition)
{
    SetCursorPos (roundToInt (newPosition.x),
                  roundToInt (newPosition.y));
}

//==============================================================================
class ScreenSaverDefeater   : public Timer
{
public:
    ScreenSaverDefeater()
    {
        startTimer (10000);
        timerCallback();
    }

    void timerCallback() override
    {
        if (Process::isForegroundProcess())
        {
            INPUT input = { 0 };
            input.type = INPUT_MOUSE;
            input.mi.mouseData = MOUSEEVENTF_MOVE;

            SendInput (1, &input, sizeof (INPUT));
        }
    }
};

static ScopedPointer<ScreenSaverDefeater> screenSaverDefeater;

void Desktop::setScreenSaverEnabled (const bool isEnabled)
{
    if (isEnabled)
        screenSaverDefeater = nullptr;
    else if (screenSaverDefeater == nullptr)
        screenSaverDefeater = new ScreenSaverDefeater();
}

bool Desktop::isScreenSaverEnabled()
{
    return screenSaverDefeater == nullptr;
}

//==============================================================================
void LookAndFeel::playAlertSound()
{
    MessageBeep (MB_OK);
}

//==============================================================================
void SystemClipboard::copyTextToClipboard (const String& text)
{
    if (OpenClipboard (0) != 0)
    {
        if (EmptyClipboard() != 0)
        {
            auto bytesNeeded = CharPointer_UTF16::getBytesRequiredFor (text.getCharPointer()) + 4;

            if (bytesNeeded > 0)
            {
                if (auto bufH = GlobalAlloc (GMEM_MOVEABLE | GMEM_DDESHARE | GMEM_ZEROINIT, bytesNeeded + sizeof (WCHAR)))
                {
                    if (auto* data = static_cast<WCHAR*> (GlobalLock (bufH)))
                    {
                        text.copyToUTF16 (data, bytesNeeded);
                        GlobalUnlock (bufH);

                        SetClipboardData (CF_UNICODETEXT, bufH);
                    }
                }
            }
        }

        CloseClipboard();
    }
}

String SystemClipboard::getTextFromClipboard()
{
    String result;

    if (OpenClipboard (0) != 0)
    {
        if (auto bufH = GetClipboardData (CF_UNICODETEXT))
        {
            if (auto* data = (const WCHAR*) GlobalLock (bufH))
            {
                result = String (data, (size_t) (GlobalSize (bufH) / sizeof (WCHAR)));
                GlobalUnlock (bufH);
            }
        }

        CloseClipboard();
    }

    return result;
}

//==============================================================================
void Desktop::setKioskComponent (Component* kioskModeComp, bool enableOrDisable, bool /*allowMenusAndBars*/)
{
    if (auto* tlw = dynamic_cast<TopLevelWindow*> (kioskModeComp))
        tlw->setUsingNativeTitleBar (! enableOrDisable);

    if (enableOrDisable)
        kioskModeComp->setBounds (getDisplays().getMainDisplay().totalArea);
}

void Desktop::allowedOrientationsChanged() {}

//==============================================================================
struct MonitorInfo
{
    MonitorInfo (Rectangle<int> rect, bool main, double d) noexcept
        : bounds (rect), dpi (d), isMain (main) {}

    Rectangle<int> bounds;
    double dpi;
    bool isMain;
};

static BOOL CALLBACK enumMonitorsProc (HMONITOR hm, HDC, LPRECT r, LPARAM userInfo)
{
    MONITORINFO info = { 0 };
    info.cbSize = sizeof (info);
    GetMonitorInfo (hm, &info);
    const bool isMain = (info.dwFlags & 1 /* MONITORINFOF_PRIMARY */) != 0;
    double dpi = 0;

    if (getDPIForMonitor != nullptr)
    {
        UINT dpiX = 0, dpiY = 0;

        if (SUCCEEDED (getDPIForMonitor (hm, MDT_Default, &dpiX, &dpiY)))
            dpi = (dpiX + dpiY) / 2.0;
    }

    ((Array<MonitorInfo>*) userInfo)->add (MonitorInfo (rectangleFromRECT (*r), isMain, dpi));

    return TRUE;
}

void Desktop::Displays::findDisplays (float masterScale)
{
    setDPIAwareness();

    Array<MonitorInfo> monitors;
    EnumDisplayMonitors (0, 0, &enumMonitorsProc, (LPARAM) &monitors);

    const double globalDPI = getGlobalDPI();

    if (monitors.size() == 0)
        monitors.add (MonitorInfo (rectangleFromRECT (getWindowRect (GetDesktopWindow())), true, globalDPI));

    // make sure the first in the list is the main monitor
    for (int i = 1; i < monitors.size(); ++i)
        if (monitors.getReference(i).isMain)
            monitors.swap (i, 0);

    RECT workArea;
    SystemParametersInfo (SPI_GETWORKAREA, 0, &workArea, 0);

    for (int i = 0; i < monitors.size(); ++i)
    {
        Display d;
        d.userArea  = d.totalArea = monitors.getReference(i).bounds / masterScale;
        d.isMain    = monitors.getReference(i).isMain;
        d.dpi       = monitors.getReference(i).dpi;

        if (d.dpi == 0)
        {
            d.scale = masterScale;
            d.dpi = globalDPI;
        }
        else
        {
            d.scale = d.dpi / 96.0;
        }

        if (d.isMain)
            d.userArea = d.userArea.getIntersection (rectangleFromRECT (workArea) / masterScale);

        displays.add (d);
    }
}

//==============================================================================
static HICON extractFileHICON (const File& file)
{
    WORD iconNum = 0;
    WCHAR name [MAX_PATH * 2];
    file.getFullPathName().copyToUTF16 (name, sizeof (name));

    return ExtractAssociatedIcon ((HINSTANCE) Process::getCurrentModuleInstanceHandle(),
                                  name, &iconNum);
}

Image juce_createIconForFile (const File& file)
{
    Image image;

    if (auto icon = extractFileHICON (file))
    {
        image = IconConverters::createImageFromHICON (icon);
        DestroyIcon (icon);
    }

    return image;
}

//==============================================================================
void* CustomMouseCursorInfo::create() const
{
    const int maxW = GetSystemMetrics (SM_CXCURSOR);
    const int maxH = GetSystemMetrics (SM_CYCURSOR);

    Image im (image);
    int hotspotX = hotspot.x;
    int hotspotY = hotspot.y;

    if (im.getWidth() > maxW || im.getHeight() > maxH)
    {
        im = im.rescaled (maxW, maxH);

        hotspotX = (hotspotX * maxW) / image.getWidth();
        hotspotY = (hotspotY * maxH) / image.getHeight();
    }

    return IconConverters::createHICONFromImage (im, FALSE, hotspotX, hotspotY);
}

void MouseCursor::deleteMouseCursor (void* cursorHandle, bool isStandard)
{
    if (cursorHandle != nullptr && ! isStandard)
        DestroyCursor ((HCURSOR) cursorHandle);
}

enum
{
    hiddenMouseCursorHandle = 32500 // (arbitrary non-zero value to mark this type of cursor)
};

void* MouseCursor::createStandardMouseCursor (const MouseCursor::StandardCursorType type)
{
    LPCTSTR cursorName = IDC_ARROW;

    switch (type)
    {
        case NormalCursor:
        case ParentCursor:                  break;
        case NoCursor:                      return (void*) hiddenMouseCursorHandle;
        case WaitCursor:                    cursorName = IDC_WAIT; break;
        case IBeamCursor:                   cursorName = IDC_IBEAM; break;
        case PointingHandCursor:            cursorName = MAKEINTRESOURCE(32649); break;
        case CrosshairCursor:               cursorName = IDC_CROSS; break;

        case LeftRightResizeCursor:
        case LeftEdgeResizeCursor:
        case RightEdgeResizeCursor:         cursorName = IDC_SIZEWE; break;

        case UpDownResizeCursor:
        case TopEdgeResizeCursor:
        case BottomEdgeResizeCursor:        cursorName = IDC_SIZENS; break;

        case TopLeftCornerResizeCursor:
        case BottomRightCornerResizeCursor: cursorName = IDC_SIZENWSE; break;

        case TopRightCornerResizeCursor:
        case BottomLeftCornerResizeCursor:  cursorName = IDC_SIZENESW; break;

        case UpDownLeftRightResizeCursor:   cursorName = IDC_SIZEALL; break;

        case DraggingHandCursor:
        {
            static void* dragHandCursor = nullptr;

            if (dragHandCursor == nullptr)
            {
                static const unsigned char dragHandData[] =
                    { 71,73,70,56,57,97,16,0,16,0,145,2,0,0,0,0,255,255,255,0,0,0,0,0,0,33,249,4,1,0,0,2,0,44,0,0,0,0,16,0,
                      16,0,0,2,52,148,47,0,200,185,16,130,90,12,74,139,107,84,123,39,132,117,151,116,132,146,248,60,209,138,
                      98,22,203,114,34,236,37,52,77,217,247,154,191,119,110,240,193,128,193,95,163,56,60,234,98,135,2,0,59 };

                dragHandCursor = CustomMouseCursorInfo (ImageFileFormat::loadFrom (dragHandData, sizeof (dragHandData)), { 8, 7 }).create();
            }

            return dragHandCursor;
        }

        case CopyingCursor:
        {
            static void* copyCursor = nullptr;

            if (copyCursor == nullptr)
            {
                static unsigned char copyCursorData[] = { 71,73,70,56,57,97,21,0,21,0,145,0,0,0,0,0,255,255,255,0,
                  128,128,255,255,255,33,249,4,1,0,0,3,0,44,0,0,0,0,21,0, 21,0,0,2,72,4,134,169,171,16,199,98,11,79,90,71,161,93,56,111,
                  78,133,218,215,137,31,82,154,100,200,86,91,202,142,12,108,212,87,235,174, 15,54,214,126,237,226,37,96,59,141,16,37,18,201,142,157,230,204,51,112,
                  252,114,147,74,83,5,50,68,147,208,217,16,71,149,252,124,5,0,59,0,0 };
                const int copyCursorSize = 119;

                copyCursor = CustomMouseCursorInfo (ImageFileFormat::loadFrom (copyCursorData, copyCursorSize), { 1, 3 }).create();
            }

            return copyCursor;
        }

        default:
            jassertfalse; break;
    }

    HCURSOR cursorH = LoadCursor (0, cursorName);

    if (cursorH == 0)
        cursorH = LoadCursor (0, IDC_ARROW);

    return cursorH;
}

//==============================================================================
void MouseCursor::showInWindow (ComponentPeer*) const
{
    auto c = (HCURSOR) getHandle();

    if (c == 0)
        c = LoadCursor (0, IDC_ARROW);
    else if (c == (HCURSOR) hiddenMouseCursorHandle)
        c = 0;

    SetCursor (c);
}

void MouseCursor::showInAllWindows() const
{
    showInWindow (nullptr);
}

} // namespace juce