Introducing NoDropShadowWindowHint window flag

Added suppport on QCocoaWindow.

Also we deprecate WA_MacNoShadow since it isn't used anywhere, and updated
the 'windowflags' example app.

Change-Id: Id0b453ba15a23b768b0615838597bca139f507ad
Reviewed-by: J-P Nurmi <jpnurmi@digia.com>

examples/widgets/widgets/windowflags/controllerwindow.cpp

@@ -99,6 +99,8 @@ void ControllerWindow::updatePreview()
         flags |= Qt::X11BypassWindowManagerHint;
     if (framelessWindowCheckBox->isChecked())
         flags |= Qt::FramelessWindowHint;
+    if (windowNoShadowCheckBox->isChecked())
+        flags |= Qt::NoDropShadowWindowHint;
     if (windowTitleCheckBox->isChecked())
         flags |= Qt::WindowTitleHint;
     if (windowSystemMenuCheckBox->isChecked())
@@ -171,6 +173,7 @@ void ControllerWindow::createHintsGroupBox()
     x11BypassWindowManagerCheckBox =
             createCheckBox(tr("X11 bypass window manager"));
     framelessWindowCheckBox = createCheckBox(tr("Frameless window"));
+    windowNoShadowCheckBox = createCheckBox(tr("No drop shadow"));
     windowTitleCheckBox = createCheckBox(tr("Window title"));
     windowSystemMenuCheckBox = createCheckBox(tr("Window system menu"));
     windowMinimizeButtonCheckBox = createCheckBox(tr("Window minimize button"));
@@ -187,8 +190,9 @@ void ControllerWindow::createHintsGroupBox()
     layout->addWidget(msWindowsFixedSizeDialogCheckBox, 0, 0);
     layout->addWidget(x11BypassWindowManagerCheckBox, 1, 0);
     layout->addWidget(framelessWindowCheckBox, 2, 0);
-    layout->addWidget(windowTitleCheckBox, 3, 0);
+    layout->addWidget(windowNoShadowCheckBox, 3, 0);
-    layout->addWidget(windowSystemMenuCheckBox, 4, 0);
+    layout->addWidget(windowTitleCheckBox, 4, 0);
+    layout->addWidget(windowSystemMenuCheckBox, 5, 0);
     layout->addWidget(windowMinimizeButtonCheckBox, 0, 1);
     layout->addWidget(windowMaximizeButtonCheckBox, 1, 1);
     layout->addWidget(windowCloseButtonCheckBox, 2, 1);
@@ -196,7 +200,7 @@ void ControllerWindow::createHintsGroupBox()
     layout->addWidget(windowShadeButtonCheckBox, 4, 1);
     layout->addWidget(windowStaysOnTopCheckBox, 5, 1);
     layout->addWidget(windowStaysOnBottomCheckBox, 6, 1);
-    layout->addWidget(customizeWindowHintCheckBox, 5, 0);
+    layout->addWidget(customizeWindowHintCheckBox, 6, 0);
     hintsGroupBox->setLayout(layout);
 }
 //! [6]

examples/widgets/widgets/windowflags/controllerwindow.h

@@ -88,6 +88,7 @@ private:
     QCheckBox *msWindowsFixedSizeDialogCheckBox;
     QCheckBox *x11BypassWindowManagerCheckBox;
     QCheckBox *framelessWindowCheckBox;
+    QCheckBox *windowNoShadowCheckBox;
     QCheckBox *windowTitleCheckBox;
     QCheckBox *windowSystemMenuCheckBox;
     QCheckBox *windowMinimizeButtonCheckBox;

examples/widgets/widgets/windowflags/previewwindow.cpp

@@ -94,6 +94,8 @@ void PreviewWindow::setWindowFlags(Qt::WindowFlags flags)
         text += "\n| Qt::X11BypassWindowManagerHint";
     if (flags & Qt::FramelessWindowHint)
         text += "\n| Qt::FramelessWindowHint";
+    if (flags & Qt::NoDropShadowWindowHint)
+        text += "\n| Qt::NoDropShadowWindowHint";
     if (flags & Qt::WindowTitleHint)
         text += "\n| Qt::WindowTitleHint";
     if (flags & Qt::WindowSystemMenuHint)

src/corelib/global/qnamespace.h

@@ -312,7 +312,8 @@ public:
         WindowOkButtonHint = 0x00080000,
         WindowCancelButtonHint = 0x00100000,
         WindowSoftkeysVisibleHint = 0x40000000,
-        WindowSoftkeysRespondHint = 0x80000000
+        WindowSoftkeysRespondHint = 0x80000000,
+        NoDropShadowWindowHint = 0x40000000
     };
 
     Q_DECLARE_FLAGS(WindowFlags, WindowType)

src/corelib/global/qnamespace.qdoc

@@ -1175,9 +1175,6 @@
     to this top level window. This attribute has no effect on non-X11
     platforms.
 
-    \value WA_MacNoShadow Since Qt 4.8, this attribute disables drop shadows
-    for this top level window. Only affects Cocoa builds of Qt for Mac OS X.
-
     \omitvalue WA_SetLayoutDirection
     \omitvalue WA_InputMethodTransparent
     \omitvalue WA_WState_CompressKeys
@@ -1208,6 +1205,7 @@
     \omitvalue WA_SetWindowModality
     \omitvalue WA_WState_WindowOpacitySet
     \omitvalue WA_WState_AcceptedTouchBeginEvent
+    \omitvalue WA_MacNoShadow
 */
 
 /*! \typedef Qt::HANDLE
@@ -1968,6 +1966,8 @@
            ability to understand Motif and/or NETWM hints. Most existing
            modern window managers can handle this.
 
+    \value NoDropShadowWindowHint  Disables window drop shadow on supporting platforms.
+
     The \c CustomizeWindowHint flag is used to enable customization of
     the window controls. This flag must be set to allow the \c
     WindowTitleHint, \c WindowSystemMenuHint, \c

src/plugins/platforms/cocoa/qcocoawindow.h

@@ -122,6 +122,7 @@ public:
 
     NSInteger windowLevel(Qt::WindowFlags flags);
     NSUInteger windowStyleMask(Qt::WindowFlags flags);
+    void setWindowShadow(Qt::WindowFlags flags);
 
     void setCurrentContext(QCocoaGLContext *context);
     QCocoaGLContext *currentContext() const;

src/plugins/platforms/cocoa/qcocoawindow.mm

@@ -370,6 +370,12 @@ NSUInteger QCocoaWindow::windowStyleMask(Qt::WindowFlags flags)
     return styleMask;
 }
 
+void QCocoaWindow::setWindowShadow(Qt::WindowFlags flags)
+{
+    bool keepShadow = !(flags & Qt::NoDropShadowWindowHint);
+    [m_nsWindow setHasShadow:(keepShadow ? YES : NO)];
+}
+
 Qt::WindowFlags QCocoaWindow::setWindowFlags(Qt::WindowFlags flags)
 {
     if (m_nsWindow) {
@@ -377,6 +383,7 @@ Qt::WindowFlags QCocoaWindow::setWindowFlags(Qt::WindowFlags flags)
         NSInteger level = this->windowLevel(flags);
         [m_nsWindow setStyleMask:styleMask];
         [m_nsWindow setLevel:level];
+        setWindowShadow(flags);
     }
 
     m_windowFlags = flags;
@@ -625,6 +632,7 @@ NSWindow * QCocoaWindow::createNSWindow()
                                          defer:NO]; // Deferring window creation breaks OpenGL (the GL context is set up
                                                     // before the window is shown and needs a proper window.).
         window->m_cocoaPlatformWindow = this;
+        setWindowShadow(flags);
 
 #if MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_7
     if (QSysInfo::QSysInfo::MacintoshVersion >= QSysInfo::MV_10_7) {