JUCE/modules/juce_gui_basics/native/accessibility/juce_win32_UIAWindowProvider.h

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

   This file is part of the JUCE 7 technical preview.
   Copyright (c) 2022 - Raw Material Software Limited

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

   For the technical preview this file cannot be licensed commercially.

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

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

namespace juce
{

//==============================================================================
class UIAWindowProvider : public UIAProviderBase,
                          public ComBaseClassHelper<ComTypes::IWindowProvider>
{
public:
    using UIAProviderBase::UIAProviderBase;

    //==============================================================================
    JUCE_COMRESULT SetVisualState (ComTypes::WindowVisualState state) override
    {
        if (! isElementValid())
            return (HRESULT) UIA_E_ELEMENTNOTAVAILABLE;

        if (auto* peer = getPeer())
        {
            switch (state)
            {
                case ComTypes::WindowVisualState_Maximized:
                    peer->setFullScreen (true);
                    break;

                case ComTypes::WindowVisualState_Minimized:
                    peer->setMinimised (true);
                    break;

                case ComTypes::WindowVisualState_Normal:
                    peer->setFullScreen (false);
                    peer->setMinimised (false);
                    break;

                default:
                    break;
            }

            return S_OK;
        }

        return (HRESULT) UIA_E_NOTSUPPORTED;
    }

    JUCE_COMRESULT Close() override
    {
        if (! isElementValid())
            return (HRESULT) UIA_E_ELEMENTNOTAVAILABLE;

        if (auto* peer = getPeer())
        {
            peer->handleUserClosingWindow();
            return S_OK;
        }

        return (HRESULT) UIA_E_NOTSUPPORTED;
    }

    JUCE_COMRESULT WaitForInputIdle (int, BOOL* pRetVal) override
    {
        return withCheckedComArgs (pRetVal, *this, []
        {
            return (HRESULT) UIA_E_NOTSUPPORTED;
        });
    }

    JUCE_COMRESULT get_CanMaximize (BOOL* pRetVal) override
    {
        return withCheckedComArgs (pRetVal, *this, [&]() -> HRESULT
        {
            if (auto* peer = getPeer())
            {
                *pRetVal = (peer->getStyleFlags() & ComponentPeer::windowHasMaximiseButton) != 0;
                return S_OK;
            }

            return (HRESULT) UIA_E_NOTSUPPORTED;
        });
    }

    JUCE_COMRESULT get_CanMinimize (BOOL* pRetVal) override
    {
        return withCheckedComArgs (pRetVal, *this, [&]() -> HRESULT
        {
            if (auto* peer = getPeer())
            {
                *pRetVal = (peer->getStyleFlags() & ComponentPeer::windowHasMinimiseButton) != 0;
                return S_OK;
            }

            return (HRESULT) UIA_E_NOTSUPPORTED;
        });
    }

    JUCE_COMRESULT get_IsModal (BOOL* pRetVal) override
    {
        return withCheckedComArgs (pRetVal, *this, [&]() -> HRESULT
        {
            if (auto* peer = getPeer())
            {
                *pRetVal = peer->getComponent().isCurrentlyModal();
                return S_OK;
            }

            return (HRESULT) UIA_E_NOTSUPPORTED;
        });
    }

    JUCE_COMRESULT get_WindowVisualState (ComTypes::WindowVisualState* pRetVal) override
    {
        return withCheckedComArgs (pRetVal, *this, [&]() -> HRESULT
        {
            if (auto* peer = getPeer())
            {
                if (peer->isFullScreen())
                    *pRetVal = ComTypes::WindowVisualState_Maximized;
                else if (peer->isMinimised())
                    *pRetVal = ComTypes::WindowVisualState_Minimized;
                else
                    *pRetVal = ComTypes::WindowVisualState_Normal;

                return S_OK;
            }

            return (HRESULT) UIA_E_NOTSUPPORTED;
        });
    }

    JUCE_COMRESULT get_WindowInteractionState (ComTypes::WindowInteractionState* pRetVal) override
    {
        return withCheckedComArgs (pRetVal, *this, [&]() -> HRESULT
        {
            if (auto* peer = getPeer())
            {
                *pRetVal = peer->getComponent().isCurrentlyBlockedByAnotherModalComponent()
                    ? ComTypes::WindowInteractionState::WindowInteractionState_BlockedByModalWindow
                    : ComTypes::WindowInteractionState::WindowInteractionState_Running;

                return S_OK;
            }

            return (HRESULT) UIA_E_NOTSUPPORTED;
        });
    }

    JUCE_COMRESULT get_IsTopmost (BOOL* pRetVal) override
    {
        return withCheckedComArgs (pRetVal, *this, [&]() -> HRESULT
        {
            if (auto* peer = getPeer())
            {
                *pRetVal = peer->isFocused();
                return S_OK;
            }

            return (HRESULT) UIA_E_NOTSUPPORTED;
        });
    }

private:
    ComponentPeer* getPeer() const
    {
        return getHandler().getComponent().getPeer();
    }

    //==============================================================================
    JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (UIAWindowProvider)
};

} // namespace juce