Add QNativeInterface::Private::QWaylandWindow

Allows to access the wl_surface, the setCustomMargins functions and
the object corresponding to the surface role of the surface.
Also adds  the xdg activation token functionality as it is needed by
another change in qtbase.
If the type passed to surfaceRole does not match the actual type of the
current surface role nullptr is returned.
QVariant is not used for transferring the surface role object because
it requires Q_DECLARE_OPAQUE_POINTER for storing and retrieving from
the QVariant. However QtWayland uses a plugin system for shell integrations
with known external plugins so it is not possible to centrally do this
for every possible pointer type. The alternative would be that plugin
and consumer delcare it both which does not make for an ergonomic API.

Change-Id: I6f4e036846485ba1895e7435bb28827b83249024
Reviewed-by: Tor Arne Vestbø <tor.arne.vestbo@qt.io>

src/gui/kernel/qplatformwindow_p.h

@@ -20,6 +20,12 @@
 #include <QtCore/qrect.h>
 #include <QtCore/qnativeinterface.h>
 
+#if defined(Q_OS_UNIX)
+#include <any>
+
+struct wl_surface;
+#endif
+
 QT_BEGIN_NAMESPACE
 
 class QMargins;
@@ -89,6 +95,33 @@ struct Q_GUI_EXPORT QWindowsWindow
 };
 #endif // Q_OS_WIN
 
+#if defined(Q_OS_UNIX)
+struct Q_GUI_EXPORT QWaylandWindow : public QObject
+{
+    Q_OBJECT
+public:
+    QT_DECLARE_NATIVE_INTERFACE(QWaylandWindow, 1, QWindow)
+
+    virtual wl_surface *surface() const = 0;
+    virtual void setCustomMargins(const QMargins &margins) = 0;
+    virtual void requestXdgActivationToken(uint serial) = 0;
+    template<typename T>
+    T *surfaceRole() const
+    {
+        std::any anyRole = _surfaceRole();
+        auto role = std::any_cast<T *>(&anyRole);
+        return role ? *role : nullptr;
+    }
+signals:
+    void surfaceCreated();
+    void surfaceDestroyed();
+    void xdgActivationTokenCreated(const QString &token);
+
+protected:
+    virtual std::any _surfaceRole() const = 0;
+};
+#endif
+
 } // QNativeInterface::Private
 
 QT_END_NAMESPACE

src/gui/kernel/qwindow.cpp

@@ -3027,6 +3027,10 @@ void *QWindow::resolveInterface(const char *name, int revision) const
     QT_NATIVE_INTERFACE_RETURN_IF(QCocoaWindow, platformWindow);
 #endif
 
+#if defined(Q_OS_UNIX)
+    QT_NATIVE_INTERFACE_RETURN_IF(QWaylandWindow, platformWindow);
+#endif
+
     return nullptr;
 }
 

src/gui/platform/unix/qunixnativeinterface.cpp

@@ -269,6 +269,17 @@ QT_DEFINE_NATIVE_INTERFACE(QWaylandApplication);
 
 QT_DEFINE_PRIVATE_NATIVE_INTERFACE(QWaylandScreen);
 
+/*!
+    \class QNativeInterface::QWaylandWindow
+    \since 6.5
+    \internal
+    \brief Native interface to a Wayland window.
+    \inmodule QtGui
+    \ingroup native-interfaces
+*/
+
+QT_DEFINE_PRIVATE_NATIVE_INTERFACE(QWaylandWindow);
+
 #endif // Q_OS_UNIX
 
 QT_END_NAMESPACE