winrt: Refactor platform plugin for XAML support

By using XAML as the platform compositor, many benefits are possible:
 - Better input context handling for tablets
 - Better multiple window support (including non-fullscreen windows)
 - Support for transparent windows and window opacity
 - Integration with native platform controls
 - Simpler orientation handling on Windows Phone with built-in transitions

This patch applies only the minimal parts to make XAML mode work just as
the raw D3D mode. It does this by:
 - Moving all OpenGL parts into QWinRTEGLContext. This will allow us to
   have non-OpenGL windows later (e.g. Direct2D raster surfaces).
 - Moving more window-specific parts into QWinRTWindow. Each window creates
   a SwapChainPanel which can then be used for ANGLE (or Direct2D) content.
 - Moving non screen-specific parts into QWinRTIntegration.
 - Having QWinRTScreen create the base XAML element Canvas.
 - Running certain calls on the UI thread where necessary.

The following code parts were removed:
 - The UIAutomationCore code in QWinRTInputContext, as this is incompatible
   with XAML automation.
 - The D3D Trim and device blacklist, as these have been fixed in ANGLE.
 - Core dispatcher processing in QEventDispatcherWinRT. Now there is only
   one native event dispatcher; it is always running and never needs to be
   pumped.

Future commits should address:
 - Maintaining the window stack list and visibility using the XAML Canvas.
 - Allowing for windows (e.g. popups) to be sized and positioned instead
   of fullscreen.
 - Using the XAML automation API to improve the platform input context.

[ChangeLog][QPA][winrt] Windows Store apps are now composited inside a
XAML container, allowing for tighter integration with the native UI layer.

Change-Id: I285c6dea657c5dab2fda2b1bd8e8e5dd15882c72
Reviewed-by: Oliver Wolff <oliver.wolff@theqtcompany.com>

1 files changed, 36 insertions, 7 deletions

diff --git a/src/plugins/platforms/winrt/qwinrtintegration.h b/src/plugins/platforms/winrt/qwinrtintegration.h
index bbd6c1e41b..0115e034b5 100644
--- a/src/plugins/platforms/winrt/qwinrtintegration.h
+++ b/src/plugins/platforms/winrt/qwinrtintegration.h
@@ -39,11 +39,33 @@
 
 #include <qpa/qplatformintegration.h>
 
+namespace ABI {
+    namespace Windows {
+        namespace ApplicationModel {
+            struct ISuspendingEventArgs;
+        }
+        namespace Foundation {
+            struct IAsyncAction;
+        }
+#ifdef Q_OS_WINPHONE
+        namespace Phone {
+            namespace UI {
+                namespace Input {
+                    struct IBackPressedEventArgs;
+                }
+            }
+        }
+#endif
+    }
+}
+struct IAsyncInfo;
+struct IInspectable;
+
 QT_BEGIN_NAMESPACE
 
 class QAbstractEventDispatcher;
-class QWinRTScreen;
 
+class QWinRTIntegrationPrivate;
 class QWinRTIntegration : public QPlatformIntegration
 {
 private:
@@ -53,10 +75,12 @@ public:
 
     static QWinRTIntegration *create()
     {
-        QWinRTIntegration *integration = new QWinRTIntegration;
-        return integration->m_success ? integration : 0;
+        QScopedPointer<QWinRTIntegration> integration(new QWinRTIntegration);
+        return integration->succeeded() ? integration.take() : nullptr;
     }
 
+    bool succeeded() const;
+
     bool hasCapability(QPlatformIntegration::Capability cap) const;
     QVariant styleHint(StyleHint hint) const;
 
@@ -71,11 +95,16 @@ public:
 
     QStringList themeNames() const;
     QPlatformTheme *createPlatformTheme(const QString &name) const;
+
 private:
-    bool m_success;
-    QWinRTScreen *m_screen;
-    QPlatformFontDatabase *m_fontDatabase;
-    QPlatformServices *m_services;
+#ifdef Q_OS_WINPHONE
+    HRESULT onBackButtonPressed(IInspectable *, ABI::Windows::Phone::UI::Input::IBackPressedEventArgs *args);
+#endif
+    HRESULT onSuspended(IInspectable *, ABI::Windows::ApplicationModel::ISuspendingEventArgs *);
+    HRESULT onResume(IInspectable *, IInspectable *);
+
+    QScopedPointer<QWinRTIntegrationPrivate> d_ptr;
+    Q_DECLARE_PRIVATE(QWinRTIntegration)
 };
 
 QT_END_NAMESPACE