DPF/dgl/Window.hpp

/*
 * DISTRHO Plugin Framework (DPF)
 * Copyright (C) 2012-2021 Filipe Coelho <falktx@falktx.com>
 *
 * Permission to use, copy, modify, and/or distribute this software for any purpose with
 * or without fee is hereby granted, provided that the above copyright notice and this
 * permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD
 * TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN
 * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER
 * IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
 * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#ifndef DGL_WINDOW_HPP_INCLUDED
#define DGL_WINDOW_HPP_INCLUDED

#include "Geometry.hpp"

START_NAMESPACE_DGL

class Application;
class TopLevelWidget;

// -----------------------------------------------------------------------

/**
   DGL Window class.

   This is the where all OS-related events initially happen, before being propagated to any widgets.

   A Window MUST have an Application instance tied to it.
   It is not possible to swap Application instances from within the lifetime of a Window.
   But it is possible to completely change the Widgets that a Window contains during its lifetime.

   Typically the event handling functions as following:
   Application -> Window -> Top-Level-Widget -> SubWidgets

   Please note that, unlike many other graphical toolkits out there,
   DGL makes a clear distinction between a Window and a Widget.
   You cannot directly draw in a Window, you need to create a Widget for that.

   Also, a Window MUST have a single top-level Widget.
   The Window will take care of global screen positioning and resizing, everything else is sent for widgets to handle.

   ...
 */
class Window
{
public:
   /**
      Constructor for a regular, standalone window.
    */
    explicit Window(Application& app);

   /**
      Constructor for an embed Window, typically used in modules or plugins that run inside another host.
    */
    explicit Window(Application& app,
                    uintptr_t parentWindowHandle,
                    uint width,
                    uint height,
                    double scaling,
                    bool resizable);

   /**
      Destructor.
    */
    virtual ~Window();

   /**
      Whether this Window is embed into another (usually not DGL-controlled) Window.
    */
    bool isEmbed() const noexcept;

   /**
      Check if this window is visible / mapped.
      Invisible windows do not receive events except resize.
      @see setVisible(bool)
    */
    bool isVisible() const noexcept;

   /**
      Set windows visible (or not) according to @a visible.
      Only valid for standalones, embed windows are always visible.
      @see isVisible(), hide(), show()
    */
    void setVisible(bool visible);

   /**
      Show window.
      This is the same as calling setVisible(true).
      @see isVisible(), setVisible(bool)
    */
    void show();

   /**
      Hide window.
      This is the same as calling setVisible(false).
      @see isVisible(), setVisible(bool)
    */
    void hide();

   /**
      Hide window and notify application of a window close event.
      The application event-loop will stop when all windows have been closed.
      For standalone windows only, has no effect if window is embed.
      @see isEmbed()

      @note It is possible to hide the window while not stopping the event-loop.
            A closed window is always hidden, but the reverse is not always true.
    */
    void close();

   /**
      Get width.
    */
    uint getWidth() const noexcept;

   /**
      Get height.
    */
    uint getHeight() const noexcept;

   /**
      Get size.
    */
    Size<uint> getSize() const noexcept;

   /**
      Set width.
    */
    void setWidth(uint width);

   /**
      Set height.
    */
    void setHeight(uint height);

   /**
      Set size using @a width and @a height values.
    */
    void setSize(uint width, uint height);

   /**
      Set size.
    */
    void setSize(const Size<uint>& size);

    const char* getTitle() const noexcept;
    void setTitle(const char* title);

   /**
      Get the application associated with this window.
    */
    Application& getApp() const noexcept;

   /**
      Get the "native" window handle.
      Returned value depends on the platform:
       - HaikuOS: This is a pointer to a `BView`.
       - MacOS: This is a pointer to an `NSView*`.
       - Windows: This is a `HWND`.
       - Everything else: This is an [X11] `Window`.
    */
    uintptr_t getNativeWindowHandle() const noexcept;

protected:
   /**
      A function called when the window is resized.
      If there is a top-level widget associated with this window, its size will be set right after this function.
    */
    virtual void onReshape(uint width, uint height);

private:
    struct PrivateData;
    PrivateData* const pData;
    friend class Application;
    friend class TopLevelWidget;

    DISTRHO_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR(Window);
};

// -----------------------------------------------------------------------

END_NAMESPACE_DGL

/* TODO
 * add focusEvent with CrossingMode arg
 * add eventcrossing/enter-leave event
 */

// class StandaloneWindow;
// class Widget;

// #ifdef DISTRHO_DEFINES_H_INCLUDED
// START_NAMESPACE_DISTRHO
// class UI;
// class UIExporter;
// END_NAMESPACE_DISTRHO
// #endif

#if 0
#ifndef DGL_FILE_BROWSER_DISABLED
   /**
      File browser options.
    */
    struct FileBrowserOptions {
        const char* startDir;
        const char* title;
        uint width;
        uint height;

      /**
         File browser buttons.

         0 means hidden.
         1 means visible and unchecked.
         2 means visible and checked.
        */
        struct Buttons {
            uint listAllFiles;
            uint showHidden;
            uint showPlaces;

            /** Constuctor for default values */
            Buttons()
                : listAllFiles(2),
                  showHidden(1),
                  showPlaces(1) {}
        } buttons;

        /** Constuctor for default values */
        FileBrowserOptions()
            : startDir(nullptr),
              title(nullptr),
              width(0),
              height(0),
              buttons() {}
    };
#endif // DGL_FILE_BROWSER_DISABLED

    static Window& withTransientParentWindow(Window& transientParentWindow);

    void exec(bool lockWait = false);

    void focus();
    void repaint() noexcept;
    void repaint(const Rectangle<uint>& rect) noexcept;

#ifndef DGL_FILE_BROWSER_DISABLED
    bool openFileBrowser(const FileBrowserOptions& options);
#endif

    bool isResizable() const noexcept;
    void setResizable(bool resizable);

    bool getIgnoringKeyRepeat() const noexcept;
    void setIgnoringKeyRepeat(bool ignore) noexcept;

    void setGeometryConstraints(uint width, uint height, bool aspect);
    void setTransientWinId(uintptr_t winId);

    double getScaling() const noexcept;

    const GraphicsContext& getGraphicsContext() const noexcept;

    void addIdleCallback(IdleCallback* const callback);
    void removeIdleCallback(IdleCallback* const callback);


protected:
    virtual void onClose();

#ifndef DGL_FILE_BROWSER_DISABLED
    virtual void fileBrowserSelected(const char* filename);
#endif

    // internal
    void _setAutoScaling(double scaling) noexcept;

    virtual void _addWidget(Widget* const widget);
    virtual void _removeWidget(Widget* const widget);
    void _idle();

    bool handlePluginKeyboard(const bool press, const uint key);
    bool handlePluginSpecial(const bool press, const Key key);

//     friend class Widget;
//     friend class StandaloneWindow;
// #ifdef DISTRHO_DEFINES_H_INCLUDED
//     friend class DISTRHO_NAMESPACE::UI;
//     friend class DISTRHO_NAMESPACE::UIExporter;
// #endif

    // Prevent copies
// #ifdef DISTRHO_PROPER_CPP11_SUPPORT
//     Window& operator=(Window&) = delete;
//     Window& operator=(const Window&) = delete;
// #else
//     Window& operator=(Window&);
//     Window& operator=(const Window&);
// #endif

#endif

// -----------------------------------------------------------------------

#endif // DGL_WINDOW_HPP_INCLUDED