7 files changed, 62 insertions, 6 deletions
diff --git a/src/plugins/platforms/cocoa/qcocoaglcontext.mm b/src/plugins/platforms/cocoa/qcocoaglcontext.mm
index 8af90b13bf..4b637a707d 100644
--- a/src/plugins/platforms/cocoa/qcocoaglcontext.mm
+++ b/src/plugins/platforms/cocoa/qcocoaglcontext.mm
@@ -192,8 +192,6 @@ bool QCocoaGLContext::makeCurrent(QPlatformSurface *surface)
     QWindow *window = static_cast<QCocoaWindow *>(surface)->window();
     setActiveWindow(window);
 
-    if (![m_context view])
-        return false;
     [m_context makeCurrentContext];
     update();
     return true;
diff --git a/src/plugins/platforms/cocoa/qcocoawindow.h b/src/plugins/platforms/cocoa/qcocoawindow.h
index 4f5a208f43..c7ec315f04 100644
--- a/src/plugins/platforms/cocoa/qcocoawindow.h
+++ b/src/plugins/platforms/cocoa/qcocoawindow.h
@@ -159,8 +159,10 @@ public:
     void registerTouch(bool enable);
 
     qreal devicePixelRatio() const;
+    bool isWindowExposable();
     void exposeWindow();
     void obscureWindow();
+    void updateExposedGeometry();
     QWindow *childWindowAt(QPoint windowPoint);
 protected:
     // NSWindow handling. The QCocoaWindow/QNSView can either be displayed
@@ -202,7 +204,9 @@ public: // for QNSView
 
     bool m_hasModalSession;
     bool m_frameStrutEventsEnabled;
+    bool m_geometryUpdateExposeAllowed;
     bool m_isExposed;
+    QRect m_exposedGeometry;
     int m_registerTouchCount;
     bool m_resizableTransientParent;
     bool m_overrideBecomeKey;
diff --git a/src/plugins/platforms/cocoa/qcocoawindow.mm b/src/plugins/platforms/cocoa/qcocoawindow.mm
index 1aace958ed..a2ef43db67 100644
--- a/src/plugins/platforms/cocoa/qcocoawindow.mm
+++ b/src/plugins/platforms/cocoa/qcocoawindow.mm
@@ -213,6 +213,7 @@ QCocoaWindow::QCocoaWindow(QWindow *tlw)
     , m_windowCursor(0)
     , m_hasModalSession(false)
     , m_frameStrutEventsEnabled(false)
+    , m_geometryUpdateExposeAllowed(false)
     , m_isExposed(false)
     , m_registerTouchCount(0)
     , m_resizableTransientParent(false)
@@ -1084,22 +1085,61 @@ qreal QCocoaWindow::devicePixelRatio() const
     }
 }
 
+// Returns whether the window can be expose, which it can
+// if it is on screen and has a valid geometry.
+bool QCocoaWindow::isWindowExposable()
+{
+    QSize size = geometry().size();
+    bool validGeometry = (size.width() > 0 && size.height() > 0);
+    bool validScreen = ([[m_contentView window] screen] != 0);
+    bool nonHiddenSuperView = ![[m_contentView superview] isHidden];
+    return (validGeometry && validScreen && nonHiddenSuperView);
+}
+
+// Exposes the window by posting an expose event to QWindowSystemInterface
 void QCocoaWindow::exposeWindow()
 {
-    if (!m_isExposed && ![[m_contentView superview] isHidden]) {
+    m_geometryUpdateExposeAllowed = true;
+
+    if (!isWindowExposable())
+        return;
+
+    if (!m_isExposed) {
         m_isExposed = true;
+        m_exposedGeometry = geometry();
         QWindowSystemInterface::handleExposeEvent(window(), QRegion(geometry()));
     }
 }
 
+// Obscures the window by posting an empty expose event to QWindowSystemInterface
 void QCocoaWindow::obscureWindow()
 {
     if (m_isExposed) {
+        m_geometryUpdateExposeAllowed = false;
         m_isExposed = false;
         QWindowSystemInterface::handleExposeEvent(window(), QRegion());
     }
 }
 
+// Updates window geometry by posting an expose event to QWindowSystemInterface
+void QCocoaWindow::updateExposedGeometry()
+{
+    // updateExposedGeometry is not allowed to send the initial expose. If you want
+    // that call exposeWindow();
+    if (!m_geometryUpdateExposeAllowed)
+        return;
+
+    if (!isWindowExposable())
+        return;
+
+    if (m_exposedGeometry == geometry())
+        return;
+
+    m_isExposed = true;
+    m_exposedGeometry = geometry();
+    QWindowSystemInterface::handleExposeEvent(window(), QRegion(geometry()));
+}
+
 QWindow *QCocoaWindow::childWindowAt(QPoint windowPoint)
 {
     QWindow *targetWindow = window();
diff --git a/src/plugins/platforms/cocoa/qnsview.h b/src/plugins/platforms/cocoa/qnsview.h
index ca2a15a1cc..403f8dc78a 100644
--- a/src/plugins/platforms/cocoa/qnsview.h
+++ b/src/plugins/platforms/cocoa/qnsview.h
@@ -93,6 +93,8 @@ QT_END_NAMESPACE
 - (BOOL)hasMask;
 - (BOOL)isOpaque;
 
+- (void)convertFromScreen:(NSPoint)mouseLocation toWindowPoint:(QPointF *)qtWindowPoint andScreenPoint:(QPointF *)qtScreenPoint;
+
 - (void)resetMouseButtons;
 
 - (void)handleMouseEvent:(NSEvent *)theEvent;
diff --git a/src/plugins/platforms/cocoa/qnsview.mm b/src/plugins/platforms/cocoa/qnsview.mm
index 71c4de3b69..1c15c3b561 100644
--- a/src/plugins/platforms/cocoa/qnsview.mm
+++ b/src/plugins/platforms/cocoa/qnsview.mm
@@ -175,7 +175,7 @@ static QTouchDevice *touchDevice = 0;
 - (void) globalFrameChanged:(NSNotification*)notification
 {
     Q_UNUSED(notification);
-    QWindowSystemInterface::handleExposeEvent(m_window, m_window->geometry());
+    m_platformWindow->updateExposedGeometry();
 }
 
 - (void)viewDidMoveToSuperview
@@ -186,7 +186,7 @@ static QTouchDevice *touchDevice = 0;
     if ([self superview]) {
         m_platformWindow->m_contentViewIsEmbedded = true;
         QWindowSystemInterface::handleGeometryChange(m_window, m_platformWindow->geometry());
-        QWindowSystemInterface::handleExposeEvent(m_window, m_platformWindow->geometry());
+        m_platformWindow->updateExposedGeometry();
         QWindowSystemInterface::flushWindowSystemEvents();
     } else {
         m_platformWindow->m_contentViewIsEmbedded = false;
@@ -261,7 +261,7 @@ static QTouchDevice *touchDevice = 0;
     // Send a geometry change event to Qt, if it's ready to handle events
     if (!m_platformWindow->m_inConstructor) {
         QWindowSystemInterface::handleGeometryChange(m_window, geometry);
-        QWindowSystemInterface::handleExposeEvent(m_window, geometry);
+        m_platformWindow->updateExposedGeometry();
         QWindowSystemInterface::flushWindowSystemEvents();
     }
 }
diff --git a/src/plugins/platforms/cocoa/qnswindowdelegate.h b/src/plugins/platforms/cocoa/qnswindowdelegate.h
index 06e11fffbb..5717551cc3 100644
--- a/src/plugins/platforms/cocoa/qnswindowdelegate.h
+++ b/src/plugins/platforms/cocoa/qnswindowdelegate.h
@@ -53,6 +53,7 @@
 
 - (id)initWithQCocoaWindow: (QCocoaWindow *) cocoaWindow;
 
+- (void)windowDidBecomeKey:(NSNotification *)notification;
 - (void)windowDidResize:(NSNotification *)notification;
 - (void)windowDidMove:(NSNotification *)notification;
 - (void)windowWillMove:(NSNotification *)notification;
diff --git a/src/plugins/platforms/cocoa/qnswindowdelegate.mm b/src/plugins/platforms/cocoa/qnswindowdelegate.mm
index 10536bd5f4..c9b3d69381 100644
--- a/src/plugins/platforms/cocoa/qnswindowdelegate.mm
+++ b/src/plugins/platforms/cocoa/qnswindowdelegate.mm
@@ -56,6 +56,17 @@
     return self;
 }
 
+- (void)windowDidBecomeKey:(NSNotification *)notification
+{
+    Q_UNUSED(notification);
+    if (m_cocoaWindow->m_windowUnderMouse) {
+        QPointF windowPoint;
+        QPointF screenPoint;
+        [m_cocoaWindow->m_qtView convertFromScreen:[NSEvent mouseLocation] toWindowPoint:&windowPoint andScreenPoint:&screenPoint];
+        QWindowSystemInterface::handleEnterEvent(m_cocoaWindow->m_enterLeaveTargetWindow, windowPoint, screenPoint);
+    }
+}
+
 - (void)windowDidResize:(NSNotification *)notification
 {
     Q_UNUSED(notification);