Move default implementation of update requests to QPlatformWindow

Change-Id: I4cbb8d2023068288e298ab21f5cd8bc258825c77
Reviewed-by: Simon Hausmann <simon.hausmann@qt.io>

src/gui/kernel/qguiapplication.cpp

@@ -1754,8 +1754,11 @@ int QGuiApplication::exec()
 */
 bool QGuiApplication::notify(QObject *object, QEvent *event)
 {
-    if (object->isWindowType())
-        QGuiApplicationPrivate::sendQWindowEventToQPlatformWindow(static_cast<QWindow *>(object), event);
+    if (object->isWindowType()) {
+        if (QGuiApplicationPrivate::sendQWindowEventToQPlatformWindow(static_cast<QWindow *>(object), event))
+            return true; // Platform plugin ate the event
+    }
+
     return QCoreApplication::notify(object, event);
 }
 
@@ -1777,18 +1780,18 @@ bool QGuiApplication::compressEvent(QEvent *event, QObject *receiver, QPostEvent
     return QCoreApplication::compressEvent(event, receiver, postedEvents);
 }
 
-void QGuiApplicationPrivate::sendQWindowEventToQPlatformWindow(QWindow *window, QEvent *event)
+bool QGuiApplicationPrivate::sendQWindowEventToQPlatformWindow(QWindow *window, QEvent *event)
 {
     if (!window)
-        return;
+        return false;
     QPlatformWindow *platformWindow = window->handle();
     if (!platformWindow)
-        return;
+        return false;
     // spontaneous events come from the platform integration already, we don't need to send the events back
     if (event->spontaneous())
-        return;
+        return false;
     // let the platform window do any handling it needs to as well
-    platformWindow->windowEvent(event);
+    return platformWindow->windowEvent(event);
 }
 
 bool QGuiApplicationPrivate::processNativeEvent(QWindow *window, const QByteArray &eventType, void *message, long *result)

src/gui/kernel/qguiapplication_p.h

@@ -173,7 +173,7 @@ public:
 
     static bool processNativeEvent(QWindow *window, const QByteArray &eventType, void *message, long *result);
 
-    static void sendQWindowEventToQPlatformWindow(QWindow *window, QEvent *event);
+    static bool sendQWindowEventToQPlatformWindow(QWindow *window, QEvent *event);
 
     static inline Qt::Alignment visualAlignment(Qt::LayoutDirection direction, Qt::Alignment alignment)
     {

src/gui/kernel/qplatformwindow.cpp

@@ -461,14 +461,26 @@ bool QPlatformWindow::setWindowModified(bool modified)
 
 /*!
     Reimplement this method to be able to do any platform specific event
-    handling. All events for window() are passed to this function before being
-    sent to QWindow::event().
+    handling. All non-synthetic events for window() are passed to this
+    function before being sent to QWindow::event().
 
-    The default implementation is empty and does nothing with \a event.
+    Return true if the event should not be passed on to the QWindow.
+
+    Subclasses should always call the base class implementation.
 */
-void QPlatformWindow::windowEvent(QEvent *event)
+bool QPlatformWindow::windowEvent(QEvent *event)
 {
-    Q_UNUSED(event);
+    Q_D(QPlatformWindow);
+
+    if (event->type() == QEvent::Timer) {
+        if (static_cast<QTimerEvent *>(event)->timerId() == d->updateTimer.timerId()) {
+            d->updateTimer.stop();
+            deliverUpdateRequest();
+            return true;
+        }
+    }
+
+    return false;
 }
 
 /*!
@@ -734,18 +746,16 @@ QRect QPlatformWindow::initialGeometry(const QWindow *w,
 */
 void QPlatformWindow::requestUpdate()
 {
-    static int timeout = -1;
-    if (timeout == -1) {
-        bool ok = false;
-        timeout = qEnvironmentVariableIntValue("QT_QPA_UPDATE_IDLE_TIME", &ok);
-        if (!ok)
-            timeout = 5;
-    }
+    Q_D(QPlatformWindow);
 
-    QWindow *w = window();
-    QWindowPrivate *wp = qt_window_private(w);
-    Q_ASSERT(wp->updateTimer == 0);
-    wp->updateTimer = w->startTimer(timeout, Qt::PreciseTimer);
+    static int updateInterval = []() {
+        bool ok = false;
+        int customUpdateInterval = qEnvironmentVariableIntValue("QT_QPA_UPDATE_IDLE_TIME", &ok);
+        return ok ? customUpdateInterval : 5;
+    }();
+
+    Q_ASSERT(!d->updateTimer.isActive());
+    d->updateTimer.start(updateInterval, Qt::PreciseTimer, window());
 }
 
 /*!

src/gui/kernel/qplatformwindow.h

@@ -127,7 +127,7 @@ public:
 
     virtual bool setWindowModified(bool modified);
 
-    virtual void windowEvent(QEvent *event);
+    virtual bool windowEvent(QEvent *event);
 
     virtual bool startSystemResize(const QPoint &pos, Qt::Corner corner);
     virtual bool startSystemMove(const QPoint &pos);

src/gui/kernel/qplatformwindow_p.h

@@ -52,6 +52,7 @@
 //
 
 #include <QtGui/private/qtguiglobal_p.h>
+#include <QtCore/qbasictimer.h>
 #include <QtCore/qrect.h>
 
 QT_BEGIN_NAMESPACE
@@ -60,6 +61,7 @@ class QPlatformWindowPrivate
 {
 public:
     QRect rect;
+    QBasicTimer updateTimer;
 };
 
 QT_END_NAMESPACE

src/gui/kernel/qwindow.cpp

@@ -2328,19 +2328,6 @@ bool QWindow::event(QEvent *ev)
         break;
 #endif
 
-    case QEvent::Timer: {
-        Q_D(QWindow);
-        if (static_cast<QTimerEvent *>(ev)->timerId() == d->updateTimer) {
-            killTimer(d->updateTimer);
-            d->updateTimer = 0;
-            if (d->platformWindow)
-                d->platformWindow->deliverUpdateRequest();
-        } else {
-            QObject::event(ev);
-        }
-        break;
-    }
-
     case QEvent::PlatformSurface: {
         if ((static_cast<QPlatformSurfaceEvent *>(ev))->surfaceEventType() == QPlatformSurfaceEvent::SurfaceAboutToBeDestroyed) {
 #ifndef QT_NO_OPENGL

src/gui/kernel/qwindow_p.h

@@ -97,7 +97,6 @@ public:
         , modality(Qt::NonModal)
         , blockedByModalWindow(false)
         , updateRequestPending(false)
-        , updateTimer(0)
         , transientParent(0)
         , topLevelScreen(0)
 #ifndef QT_NO_CURSOR
@@ -192,7 +191,6 @@ public:
     bool blockedByModalWindow;
 
     bool updateRequestPending;
-    int updateTimer;
 
     QPointer<QWindow> transientParent;
     QPointer<QScreen> topLevelScreen;

src/plugins/platforms/windows/qwindowswindow.cpp

@@ -2048,7 +2048,7 @@ void QWindowsWindow::setExStyle(unsigned s) const
     SetWindowLongPtr(m_data.hwnd, GWL_EXSTYLE, s);
 }
 
-void QWindowsWindow::windowEvent(QEvent *event)
+bool QWindowsWindow::windowEvent(QEvent *event)
 {
     switch (event->type()) {
     case QEvent::WindowBlocked: // Blocked by another modal window.
@@ -2064,6 +2064,8 @@ void QWindowsWindow::windowEvent(QEvent *event)
     default:
         break;
     }
+
+    return QPlatformWindow::windowEvent(event);
 }
 
 void QWindowsWindow::propagateSizeHints()

src/plugins/platforms/windows/qwindowswindow.h

@@ -252,7 +252,7 @@ public:
     void raise() override { raise_sys(); }
     void lower() override { lower_sys(); }
 
-    void windowEvent(QEvent *event) override;
+    bool windowEvent(QEvent *event) override;
 
     void propagateSizeHints() override;
     static bool handleGeometryChangingMessage(MSG *message, const QWindow *qWindow, const QMargins &marginsDp);

src/plugins/platforms/xcb/qxcbwindow.cpp

@@ -2587,7 +2587,7 @@ bool QXcbWindow::setMouseGrabEnabled(bool grab)
     return result;
 }
 
-void QXcbWindow::windowEvent(QEvent *event)
+bool QXcbWindow::windowEvent(QEvent *event)
 {
     switch (event->type()) {
     case QEvent::FocusIn:
@@ -2613,7 +2613,7 @@ void QXcbWindow::windowEvent(QEvent *event)
     default:
         break;
     }
-    QPlatformWindow::windowEvent(event);
+    return QPlatformWindow::windowEvent(event);
 }
 
 bool QXcbWindow::startSystemResize(const QPoint &pos, Qt::Corner corner)

src/plugins/platforms/xcb/qxcbwindow.h

@@ -105,7 +105,7 @@ public:
 
     QSurfaceFormat format() const override;
 
-    void windowEvent(QEvent *event) override;
+    bool windowEvent(QEvent *event) override;
 
     bool startSystemResize(const QPoint &pos, Qt::Corner corner) override;
     bool startSystemMove(const QPoint &pos) override;

src/widgets/kernel/qapplication.cpp

@@ -2952,8 +2952,10 @@ bool QApplication::notify(QObject *receiver, QEvent *e)
     d->checkReceiverThread(receiver);
 #endif
 
-    if (receiver->isWindowType())
-        QGuiApplicationPrivate::sendQWindowEventToQPlatformWindow(static_cast<QWindow *>(receiver), e);
+    if (receiver->isWindowType()) {
+        if (QGuiApplicationPrivate::sendQWindowEventToQPlatformWindow(static_cast<QWindow *>(receiver), e))
+            return true; // Platform plugin ate the event
+    }
 
     if(e->spontaneous()) {
         // Capture the current mouse and keyboard states. Doing so here is