6 files changed, 69 insertions, 2 deletions
diff --git a/src/plugins/platforms/cocoa/qcocoabackingstore.mm b/src/plugins/platforms/cocoa/qcocoabackingstore.mm
index 665b3d4c13..30c15d823a 100644
--- a/src/plugins/platforms/cocoa/qcocoabackingstore.mm
+++ b/src/plugins/platforms/cocoa/qcocoabackingstore.mm
@@ -73,7 +73,8 @@ QPaintDevice *QCocoaBackingStore::paintDevice()
         }
 #endif
 
-        QImage::Format format = window()->format().hasAlpha()
+        QCocoaWindow *cocoaWindow = static_cast<QCocoaWindow *>(window()->handle());
+        QImage::Format format = (window()->format().hasAlpha() || cocoaWindow->m_drawContentBorderGradient)
                 ? QImage::Format_ARGB32_Premultiplied : QImage::Format_RGB32;
         m_qImage = QImage(m_requestedSize * scaleFactor, format);
         m_qImage.setDevicePixelRatio(scaleFactor);
diff --git a/src/plugins/platforms/cocoa/qcocoanativeinterface.h b/src/plugins/platforms/cocoa/qcocoanativeinterface.h
index d30b281eb8..5c59c73847 100644
--- a/src/plugins/platforms/cocoa/qcocoanativeinterface.h
+++ b/src/plugins/platforms/cocoa/qcocoanativeinterface.h
@@ -132,6 +132,9 @@ private:
     // touch events, which then will be delivered until the widget
     // deregisters.
     static void registerTouchWindow(QWindow *window,  bool enable);
+
+    // Request a unified title and toolbar look for the window.
+    static void setContentBorderThickness(QWindow *window, int topThickness, int bottomThickness);
 };
 
 #endif // QCOCOANATIVEINTERFACE_H
diff --git a/src/plugins/platforms/cocoa/qcocoanativeinterface.mm b/src/plugins/platforms/cocoa/qcocoanativeinterface.mm
index 6facab1785..eb520b97c9 100644
--- a/src/plugins/platforms/cocoa/qcocoanativeinterface.mm
+++ b/src/plugins/platforms/cocoa/qcocoanativeinterface.mm
@@ -123,6 +123,8 @@ QPlatformNativeInterface::NativeResourceForIntegrationFunction QCocoaNativeInter
         return NativeResourceForIntegrationFunction(QCocoaNativeInterface::registerTouchWindow);
     if (resource.toLower() == "setembeddedinforeignview")
         return NativeResourceForIntegrationFunction(QCocoaNativeInterface::setEmbeddedInForeignView);
+    if (resource.toLower() == "setcontentborderthickness")
+        return NativeResourceForIntegrationFunction(QCocoaNativeInterface::setContentBorderThickness);
 
     return 0;
 }
@@ -273,4 +275,14 @@ void QCocoaNativeInterface::registerTouchWindow(QWindow *window,  bool enable)
         cocoaWindow->registerTouch(enable);
 }
 
+void QCocoaNativeInterface::setContentBorderThickness(QWindow *window, int topThickness, int bottomThickness)
+{
+    if (!window)
+        return;
+
+    QCocoaWindow *cocoaWindow = static_cast<QCocoaWindow *>(window->handle());
+    if (cocoaWindow)
+        cocoaWindow->setContentBorderThickness(topThickness, bottomThickness);
+}
+
 QT_END_NAMESPACE
diff --git a/src/plugins/platforms/cocoa/qcocoawindow.h b/src/plugins/platforms/cocoa/qcocoawindow.h
index c7ec315f04..66c3241b3d 100644
--- a/src/plugins/platforms/cocoa/qcocoawindow.h
+++ b/src/plugins/platforms/cocoa/qcocoawindow.h
@@ -157,6 +157,8 @@ public:
     void setWindowCursor(NSCursor *cursor);
 
     void registerTouch(bool enable);
+    void setContentBorderThickness(int topThickness, int bottomThickness);
+    void applyContentBorderThickness(NSWindow *window);
 
     qreal devicePixelRatio() const;
     bool isWindowExposable();
@@ -214,6 +216,10 @@ public: // for QNSView
     static const int NoAlertRequest;
     NSInteger m_alertRequest;
     id monitor;
+
+    bool m_drawContentBorderGradient;
+    int m_topContentBorderThickness;
+    int m_bottomContentBorderThickness;
 };
 
 QT_END_NAMESPACE
diff --git a/src/plugins/platforms/cocoa/qcocoawindow.mm b/src/plugins/platforms/cocoa/qcocoawindow.mm
index ad11a525ad..8e977236fa 100644
--- a/src/plugins/platforms/cocoa/qcocoawindow.mm
+++ b/src/plugins/platforms/cocoa/qcocoawindow.mm
@@ -220,6 +220,9 @@ QCocoaWindow::QCocoaWindow(QWindow *tlw)
     , m_overrideBecomeKey(false)
     , m_alertRequest(NoAlertRequest)
     , monitor(nil)
+    , m_drawContentBorderGradient(false)
+    , m_topContentBorderThickness(0)
+    , m_bottomContentBorderThickness(0)
 {
 #ifdef QT_COCOA_ENABLE_WINDOW_DEBUG
     qDebug() << "QCocoaWindow::QCocoaWindow" << this;
@@ -502,6 +505,9 @@ NSUInteger QCocoaWindow::windowStyleMask(Qt::WindowFlags flags)
         }
     }
 
+    if (m_drawContentBorderGradient)
+        styleMask |= NSTexturedBackgroundWindowMask;
+
 #ifdef QT_COCOA_ENABLE_WINDOW_DEBUG
     qDebug("windowStyleMask of '%s': flags %X -> styleMask %lX", qPrintable(window()->title()), (int)flags, styleMask);
 #endif
@@ -927,6 +933,9 @@ NSWindow * QCocoaWindow::createNSWindow()
     }
 
     m_windowModality = window()->modality();
+
+    applyContentBorderThickness(createdWindow);
+
     return createdWindow;
 }
 
@@ -1069,6 +1078,38 @@ void QCocoaWindow::registerTouch(bool enable)
         [m_contentView setAcceptsTouchEvents:NO];
 }
 
+void QCocoaWindow::setContentBorderThickness(int topThickness, int bottomThickness)
+{
+    m_topContentBorderThickness = topThickness;
+    m_bottomContentBorderThickness = bottomThickness;
+    bool enable = (topThickness > 0 || bottomThickness > 0);
+    m_drawContentBorderGradient = enable;
+
+    applyContentBorderThickness(m_nsWindow);
+}
+
+void QCocoaWindow::applyContentBorderThickness(NSWindow *window)
+{
+    if (!window)
+        return;
+
+    if (m_drawContentBorderGradient)
+        [window setStyleMask:[window styleMask] | NSTexturedBackgroundWindowMask];
+    else
+        [window setStyleMask:[window styleMask] & ~NSTexturedBackgroundWindowMask];
+
+    if (m_topContentBorderThickness > 0) {
+        [window setContentBorderThickness:m_topContentBorderThickness forEdge:NSMaxYEdge];
+        [window setAutorecalculatesContentBorderThickness:NO forEdge:NSMaxYEdge];
+    }
+
+    if (m_bottomContentBorderThickness > 0) {
+        [window setContentBorderThickness:m_topContentBorderThickness forEdge:NSMinYEdge];
+        [window setAutorecalculatesContentBorderThickness:NO forEdge:NSMinYEdge];
+    }
+}
+
+
 qreal QCocoaWindow::devicePixelRatio() const
 {
 #if MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_7
diff --git a/src/plugins/platforms/cocoa/qnsview.mm b/src/plugins/platforms/cocoa/qnsview.mm
index e183f93c6c..f7b129aea1 100644
--- a/src/plugins/platforms/cocoa/qnsview.mm
+++ b/src/plugins/platforms/cocoa/qnsview.mm
@@ -408,6 +408,9 @@ static QTouchDevice *touchDevice = 0;
         m_shouldSetGLContextinDrawRect = false;
     }
 
+    if (m_platformWindow->m_drawContentBorderGradient)
+        NSDrawWindowBackground(dirtyRect);
+
     if (!m_backingStore)
         return;
 
@@ -451,7 +454,8 @@ static QTouchDevice *touchDevice = 0;
 
     // Optimization: Copy frame buffer content instead of blending for
     // top-level windows where Qt fills the entire window content area.
-    if (m_platformWindow->m_nsWindow)
+    // (But don't overpaint the title-bar gradient)
+    if (m_platformWindow->m_nsWindow && !m_platformWindow->m_drawContentBorderGradient)
         CGContextSetBlendMode(cgContext, kCGBlendModeCopy);
 
     CGContextDrawImage(cgContext, dirtyWindowRect, cleanImg);