Add QPlatformWindow::isForeignWindow()

Simplifies code at call sites and allows for refactoring how to decide
if a window is foreign or not at a later point.

Change-Id: Icc51a83bac187f4975535366b53b4990832b6c82
Reviewed-by: Lars Knoll <lars.knoll@qt.io>

src/gui/kernel/qplatformwindow.cpp

@@ -508,7 +508,7 @@ QPlatformScreen *QPlatformWindow::screenForGeometry(const QRect &newGeometry) co
     // QRect::center can return a value outside the rectangle if it's empty.
     // Apply mapToGlobal() in case it is a foreign/embedded window.
     QPoint center = newGeometry.isEmpty() ? newGeometry.topLeft() : newGeometry.center();
-    if (window()->type() == Qt::ForeignWindow)
+    if (isForeignWindow())
         center = mapToGlobal(center - newGeometry.topLeft());
 
     if (!parent() && currentScreen && !currentScreen->geometry().contains(center)) {

src/gui/kernel/qplatformwindow.h

@@ -104,6 +104,7 @@ public:
     virtual bool isActive() const;
     virtual bool isAncestorOf(const QPlatformWindow *child) const;
     virtual bool isEmbedded() const;
+    virtual bool isForeignWindow() const { return window()->type() == Qt::ForeignWindow; };
     virtual QPoint mapToGlobal(const QPoint &pos) const;
     virtual QPoint mapFromGlobal(const QPoint &pos) const;
 

src/gui/kernel/qwindow.cpp

@@ -2440,7 +2440,7 @@ QPoint QWindow::mapToGlobal(const QPoint &pos) const
     Q_D(const QWindow);
     // QTBUG-43252, prefer platform implementation for foreign windows.
     if (d->platformWindow
-        && (type() == Qt::ForeignWindow || d->platformWindow->isEmbedded())) {
+        && (d->platformWindow->isForeignWindow() || d->platformWindow->isEmbedded())) {
         return QHighDpi::fromNativeLocalPosition(d->platformWindow->mapToGlobal(QHighDpi::toNativeLocalPosition(pos, this)), this);
     }
     return pos + d->globalPosition();
@@ -2460,7 +2460,7 @@ QPoint QWindow::mapFromGlobal(const QPoint &pos) const
     Q_D(const QWindow);
     // QTBUG-43252, prefer platform implementation for foreign windows.
     if (d->platformWindow
-        && (type() == Qt::ForeignWindow || d->platformWindow->isEmbedded())) {
+        && (d->platformWindow->isForeignWindow() || d->platformWindow->isEmbedded())) {
         return QHighDpi::fromNativeLocalPosition(d->platformWindow->mapFromGlobal(QHighDpi::toNativeLocalPosition(pos, this)), this);
     }
     return pos - d->globalPosition();
@@ -2471,11 +2471,13 @@ QPoint QWindowPrivate::globalPosition() const
     Q_Q(const QWindow);
     QPoint offset = q->position();
     for (const QWindow *p = q->parent(); p; p = p->parent()) {
-        if (p->type() != Qt::ForeignWindow) {
-            offset += p->position();
-        } else { // Use mapToGlobal() for foreign windows
+        QPlatformWindow *pw = p->handle();
+        if (pw && pw->isForeignWindow()) {
+            // Use mapToGlobal() for foreign windows
             offset += p->mapToGlobal(QPoint(0, 0));
             break;
+        } else {
+            offset += p->position();
         }
     }
     return offset;

src/plugins/platforms/android/qandroidplatformwindow.h

@@ -71,7 +71,7 @@ public:
     void requestActivateWindow() override;
     void updateStatusBarVisibility();
     inline bool isRaster() const {
-        if ((window()->flags() & Qt::ForeignWindow) == Qt::ForeignWindow)
+        if (isForeignWindow())
             return false;
 
         return window()->surfaceType() == QSurface::RasterSurface

src/plugins/platforms/cocoa/qcocoahelpers.mm

@@ -151,7 +151,8 @@ Qt::DropActions qt_mac_mapNSDragOperations(NSDragOperation nsActions)
     a no-op.
 
     For extra verbosity and clearer code, please consider checking
-    that window()->type() != Qt::ForeignWindow before using this cast.
+    that the platform window is not a foreign window before using
+    this cast, via QPlatformWindow::isForeignWindow().
 
     Do not use this method soley to check for foreign windows, as
     that will make the code harder to read for people not working

src/plugins/platforms/cocoa/qcocoawindow.mm

@@ -485,7 +485,7 @@ QCocoaWindow::~QCocoaWindow()
 
     // Make sure to disconnect observer in all case if view is valid
     // to avoid notifications received when deleting when using Qt::AA_NativeWindows attribute
-    if (window()->type() != Qt::ForeignWindow)
+    if (!isForeignWindow())
         [[NSNotificationCenter defaultCenter] removeObserver:m_view];
 
     // While it is unlikely that this window will be in the popup stack
@@ -557,7 +557,7 @@ void QCocoaWindow::setCocoaGeometry(const QRect &rect)
     QMacAutoReleasePool pool;
 
     if (m_viewIsEmbedded) {
-        if (window()->type() != Qt::ForeignWindow) {
+        if (!isForeignWindow()) {
             [m_view setFrame:NSMakeRect(0, 0, rect.width(), rect.height())];
         } else {
             QPlatformWindow::setGeometry(rect);
@@ -581,7 +581,7 @@ void QCocoaWindow::setCocoaGeometry(const QRect &rect)
         [m_view setFrame:NSMakeRect(rect.x(), rect.y(), rect.width(), rect.height())];
     }
 
-    if (window()->type() == Qt::ForeignWindow)
+    if (isForeignWindow())
         QPlatformWindow::setGeometry(rect);
 
     // will call QPlatformWindow::setGeometry(rect) during resize confirmation (see qnsview.mm)
@@ -1288,7 +1288,7 @@ void QCocoaWindow::windowDidEndLiveResize()
 
 void QCocoaWindow::windowDidBecomeKey()
 {
-    if (window()->type() == Qt::ForeignWindow)
+    if (isForeignWindow())
         return;
 
     if (m_windowUnderMouse) {
@@ -1304,7 +1304,7 @@ void QCocoaWindow::windowDidBecomeKey()
 
 void QCocoaWindow::windowDidResignKey()
 {
-    if (window()->type() == Qt::ForeignWindow)
+    if (isForeignWindow())
         return;
 
     // Key window will be non-nil if another window became key, so do not
@@ -1885,7 +1885,7 @@ void QCocoaWindow::setWindowCursor(NSCursor *cursor)
         return;
 
     // Setting a cursor in a foregin view is not supported.
-    if (window()->type() == Qt::ForeignWindow)
+    if (isForeignWindow())
         return;
 
     [m_windowCursor release];

src/plugins/platforms/cocoa/qnswindowdelegate.mm

@@ -66,7 +66,7 @@
 - (BOOL)windowShouldZoom:(NSWindow *)window toFrame:(NSRect)newFrame
 {
     Q_UNUSED(newFrame);
-    if (m_cocoaWindow && m_cocoaWindow->window()->type() != Qt::ForeignWindow)
+    if (m_cocoaWindow && !m_cocoaWindow->isForeignWindow())
         [qnsview_cast(m_cocoaWindow->view()) notifyWindowWillZoom:![window isZoomed]];
     return YES;
 }

src/plugins/platforms/windows/qwindowsmousehandler.cpp

@@ -414,7 +414,7 @@ static bool isValidWheelReceiver(QWindow *candidate)
 {
     if (candidate) {
         const QWindow *toplevel = QWindowsWindow::topLevelOf(candidate);
-        if (toplevel->type() == Qt::ForeignWindow)
+        if (toplevel->handle() && toplevel->handle()->isForeignWindow())
             return true;
         if (const QWindowsWindow *ww = QWindowsWindow::windowsWindowOf(toplevel))
             return !ww->testFlag(QWindowsWindow::BlockedByModal);

src/plugins/platforms/windows/qwindowswindow.cpp

@@ -1122,7 +1122,7 @@ void QWindowsWindow::updateDropSite(bool topLevel)
         // if the parent window is a foreign window wrapped via QWindow::fromWinId, we need to enable the drop site
         // on the first child window
         const QWindow *parent = window()->parent();
-        if (parent && (parent->type() == Qt::ForeignWindow))
+        if (parent && parent->handle() && parent->handle()->isForeignWindow())
             parentIsEmbedded = true;
     }
 

src/plugins/platforms/windows/qwindowswindow.h

@@ -385,15 +385,14 @@ QPoint QWindowsGeometryHint::mapFromGlobal(const QWindow *w, const QPoint &p)
 
 inline QWindowsWindow *QWindowsWindow::windowsWindowOf(const QWindow *w)
 {
-    QWindowsWindow *result = Q_NULLPTR;
-    if (w) {
-        const Qt::WindowType type = w->type();
-        if (type != Qt::Desktop && type != Qt::ForeignWindow) {
-            if (QPlatformWindow *pw = w->handle())
-                result = static_cast<QWindowsWindow *>(pw);
-        }
-    }
-    return result;
+    if (!w || !w->handle())
+        return nullptr;
+
+    const Qt::WindowType type = w->type();
+    if (type == Qt::Desktop || w->handle()->isForeignWindow())
+        return nullptr;
+
+    return static_cast<QWindowsWindow *>(w->handle());
 }
 
 void *QWindowsWindow::userDataOf(HWND hwnd)

src/plugins/platforms/xcb/qxcbwindow.cpp

@@ -397,7 +397,7 @@ void QXcbWindow::create()
     xcb_window_t xcb_parent_id = platformScreen->root();
     if (parent()) {
         xcb_parent_id = static_cast<QXcbWindow *>(parent())->xcb_window();
-        m_embedded = parent()->window()->type() == Qt::ForeignWindow;
+        m_embedded = parent()->isForeignWindow();
 
         QSurfaceFormat parentFormat = parent()->window()->requestedFormat();
         if (window()->surfaceType() != QSurface::OpenGLSurface && parentFormat.hasAlpha()) {
@@ -1508,7 +1508,7 @@ void QXcbWindow::setParent(const QPlatformWindow *parent)
     if (parent) {
         const QXcbWindow *qXcbParent = static_cast<const QXcbWindow *>(parent);
         xcb_parent_id = qXcbParent->xcb_window();
-        m_embedded = qXcbParent->window()->type() == Qt::ForeignWindow;
+        m_embedded = qXcbParent->isForeignWindow();
     } else {
         xcb_parent_id = xcbScreen()->root();
         m_embedded = false;

src/widgets/kernel/qapplication.cpp

@@ -2161,11 +2161,14 @@ QWidget *qt_tlw_for_window(QWindow *wnd)
     // QTBUG-32177, wnd might be a QQuickView embedded via window container.
     while (wnd && !wnd->isTopLevel()) {
         QWindow *parent = wnd->parent();
-        // Don't end up in windows not belonging to this application
-        if (parent && parent->type() != Qt::ForeignWindow)
-            wnd = wnd->parent();
-        else
+        if (!parent)
             break;
+
+        // Don't end up in windows not belonging to this application
+        if (parent->handle() && parent->handle()->isForeignWindow())
+            break;
+
+        wnd = wnd->parent();
     }
     if (wnd) {
         const auto tlws = qApp->topLevelWidgets();