Make QCocoaWindow independent of NSWindow.

QCocoaWindow now gets resize events from QNSViev
and does not require a NSWindow. QWindow instances
can now be inserted in NSView hierarchies. This is
useful for Qt-as-a-plugin use cases and is needed to
implement QMacNativeWidget for Qt 5.

Change-Id: Ia95ea9c22a15a3e62d1e6543466cff07390c70a2
Reviewed-by: Morten Johan Sørvig <morten.sorvig@nokia.com>

src/plugins/platforms/cocoa/qcocoanativeinterface.mm

@@ -52,8 +52,15 @@
 
 void *QCocoaNativeInterface::nativeResourceForWindow(const QByteArray &resourceString, QWindow *window)
 {
+    if (!window->handle()) {
+        qWarning("QCocoaNativeInterface::nativeResourceForWindow: Native window has not been created.");
+        return 0;
+    }
+
     if (resourceString == "nsopenglcontext") {
         return static_cast<QCocoaWindow *>(window->handle())->currentContext()->nsOpenGLContext();
+    } else if (resourceString == "nsview") {
+        return static_cast<QCocoaWindow *>(window->handle())->m_contentView;
     }
     return 0;
 }

src/plugins/platforms/cocoa/qcocoawindow.h

@@ -65,6 +65,25 @@
 @end
 
 QT_BEGIN_NAMESPACE
+// QCocoaWindow
+//
+// QCocoaWindow is an NSView (not an NSWindow!) in the sense
+// that it relies on a NSView for all event handling and
+// graphics output and does not require a NSWindow, except for
+// for the window-related functions like setWindowTitle.
+//
+// As a consequence of this it is possible to embed the QCocoaWindow
+// in an NSView hierarchy by getting a pointer to the "backing"
+// NSView and not calling QCocoaWindow::show():
+//
+// QWindow *qtWindow = new MyWindow();
+// qtWindow->create();
+// QPlatformNativeInterface *platformNativeInterface = QGuiApplication::platformNativeInterface();
+// NSView *qtView = (NSView *)platformNativeInterface->nativeResourceForWindow("nsview", qtWindow);
+// [parentView addSubview:qtView];
+//
+// See the qt_on_cocoa manual tests for a working example, located
+// in tests/manual/cocoa at the time of writing.
 
 class QCocoaWindow : public QPlatformWindow
 {
@@ -97,12 +116,17 @@ protected:
     QRect windowGeometry() const;
     QCocoaWindow *parentCocoaWindow() const;
 
-private:
+// private:
+public: // for QNSView
     friend class QCocoaBackingStore;
-    NSWindow *m_nsWindow;
+    friend class QCocoaNativeInterface;
+
     QNSView *m_contentView;
+    QNSWindow *m_nsWindow;
+
     quint32 m_windowAttributes;
     quint32 m_windowClass;
+    bool m_inConstructor;
     QCocoaGLContext *m_glContext;
 };
 

src/plugins/platforms/cocoa/qcocoawindow.mm

@@ -81,6 +81,7 @@ QCocoaWindow::QCocoaWindow(QWindow *tlw)
     , m_windowAttributes(0)
     , m_windowClass(0)
     , m_glContext(0)
+    , m_inConstructor(true)
 {
     QCocoaAutoReleasePool pool;
 
@@ -97,7 +98,7 @@ QCocoaWindow::QCocoaWindow(QWindow *tlw)
     // QCocoaWindow is deleted by Qt.
     [m_nsWindow setReleasedWhenClosed : NO];
 
-    m_contentView = [[QNSView alloc] initWithQWindow:tlw];
+    m_contentView = [[QNSView alloc] initWithQWindow:tlw platformWindow:this];
 
     // ### Accept touch events by default.
     // Beware that enabling touch events has a negative impact on the overall performance.
@@ -107,6 +108,7 @@ QCocoaWindow::QCocoaWindow(QWindow *tlw)
     setGeometry(tlw->geometry());
 
     [m_nsWindow setContentView:m_contentView];
+    m_inConstructor = false;
 }
 
 QCocoaWindow::~QCocoaWindow()
@@ -124,8 +126,6 @@ void QCocoaWindow::setGeometry(const QRect &rect)
     QPlatformWindow::setGeometry(rect);
 
     NSRect bounds = qt_mac_flipRect(rect, window());
-
-    [[m_nsWindow contentView] setFrameSize:bounds.size];
     [m_nsWindow setContentSize : bounds.size];
     [m_nsWindow setFrameOrigin : bounds.origin];
 }
@@ -232,23 +232,17 @@ void QCocoaWindow::windowDidMove()
 {
     NSRect rect = [[m_nsWindow contentView]frame];
     NSRect windowRect = [m_nsWindow frame];
-
-    QRect geo(windowRect.origin.x, qt_mac_flipYCoordinate(windowRect.origin.y + rect.size.height), rect.size.width, rect.size.height);
-    setGeometry(geo);
-    QWindowSystemInterface::handleSynchronousGeometryChange(window(), geo);
+    [[m_nsWindow contentView] setFrameSize:rect.size];
 }
 
 void QCocoaWindow::windowDidResize()
 {
     NSRect rect = [[m_nsWindow contentView]frame];
     NSRect windowRect = [m_nsWindow frame];
-
-    QRect geo(windowRect.origin.x, qt_mac_flipYCoordinate(windowRect.origin.y + rect.size.height), rect.size.width, rect.size.height);
-    setGeometry(geo);
-    QWindowSystemInterface::handleSynchronousGeometryChange(window(), geo);
+    // Call setFrameSize which will trigger a frameDidChangeNotificatio on QNSView.
+    [[m_nsWindow contentView] setFrameSize:rect.size];
 }
 
-
 void QCocoaWindow::windowWillClose()
 {
     QWindowSystemInterface::handleSynchronousCloseEvent(window());

src/plugins/platforms/cocoa/qnsview.h

@@ -47,15 +47,17 @@
 #include <QtGui/QImage>
 #include <QtGui/QAccessible>
 
+class QCocoaWindow;
 @interface QNSView : NSView {
     CGImageRef m_cgImage;
     QWindow *m_window;
+    QCocoaWindow *m_platformWindow;
     Qt::MouseButtons m_buttons;
     QAccessibleInterface *m_accessibleRoot;
 }
 
 - (id)init;
-- (id)initWithQWindow:(QWindow *)window;
+- (id)initWithQWindow:(QWindow *)window platformWindow:(QCocoaWindow *) platformWindow;
 
 - (void)setImage:(QImage *)image;
 - (void)drawRect:(NSRect)dirtyRect;

src/plugins/platforms/cocoa/qnsview.mm

@@ -44,6 +44,7 @@
 #include <Carbon/Carbon.h>
 
 #include "qnsview.h"
+#include "qcocoawindow.h"
 #include "qcocoahelpers.h"
 #include "qmultitouch_mac_p.h"
 
@@ -81,12 +82,14 @@ static QTouchDevice *touchDevice = 0;
     return self;
 }
 
-- (id)initWithQWindow:(QWindow *)window {
+- (id)initWithQWindow:(QWindow *)window platformWindow:(QCocoaWindow *) platformWindow
+{
     self = [self init];
     if (!self)
         return 0;
 
     m_window = window;
+    m_platformWindow = platformWindow;
     m_accessibleRoot = 0;
 
 #ifdef QT_COCOA_ENABLE_ACCESSIBILITY_INSPECTOR
@@ -106,9 +109,31 @@ static QTouchDevice *touchDevice = 0;
     m_accessibleRoot = window->accessibleRoot();
 #endif
 
+    [self setPostsFrameChangedNotifications : YES];
+    [[NSNotificationCenter defaultCenter] addObserver:self
+                                          selector:@selector(frameDidChangeNotification:)
+                                          name:NSViewFrameDidChangeNotification
+                                          object:self];
+
     return self;
 }
 
+- (void) frameDidChangeNotification: (NSNotification *) notification
+{
+    NSRect rect = [self frame];
+    NSRect windowRect = [[self window] frame];
+    QRect geo(windowRect.origin.x, qt_mac_flipYCoordinate(windowRect.origin.y + rect.size.height), rect.size.width, rect.size.height);
+
+    // Call setGeometry on QPlatformWindow. (not on QCocoaWindow,
+    // doing that will initiate a geometry change it and possibly create
+    // an infinite loop when this notification is triggered again.)
+    m_platformWindow->QPlatformWindow::setGeometry(geo);
+
+    // Send a geometry change event to Qt, if it's ready to handle events
+    if (!m_platformWindow->m_inConstructor)
+        QWindowSystemInterface::handleSynchronousGeometryChange(m_window, geo);
+}
+
 - (void) setImage:(QImage *)image
 {
     CGImageRelease(m_cgImage);

tests/manual/cocoa/qt_on_cocoa/main.mm

@@ -0,0 +1,213 @@
+/****************************************************************************
+**
+** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the test suite of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** GNU Lesser General Public License Usage
+** This file may be used under the terms of the GNU Lesser General Public
+** License version 2.1 as published by the Free Software Foundation and
+** appearing in the file LICENSE.LGPL included in the packaging of this
+** file. Please review the following information to ensure the GNU Lesser
+** General Public License version 2.1 requirements will be met:
+** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain additional
+** rights. These rights are described in the Nokia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU General
+** Public License version 3.0 as published by the Free Software Foundation
+** and appearing in the file LICENSE.GPL included in the packaging of this
+** file. Please review the following information to ensure the GNU General
+** Public License version 3.0 requirements will be met:
+** http://www.gnu.org/copyleft/gpl.html.
+**
+** Other Usage
+** Alternatively, this file may be used in accordance with the terms and
+** conditions contained in a signed written agreement between you and Nokia.
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include <QtGui>
+#include <QtDeclarative>
+
+#include <QtWidgets/QtWidgets>
+#include <private/qwidgetwindow_qpa_p.h>
+#include <QtGui/qplatformnativeinterface_qpa.h>
+
+#include <QtGui/QPixmap>
+
+#include "window.h"
+
+#include <Cocoa/Cocoa.h>
+
+
+@interface FilledView : NSView
+{
+
+}
+@end
+
+
+@implementation FilledView
+
+- (void)drawRect:(NSRect)dirtyRect {
+    // set any NSColor for filling, say white:
+    [[NSColor redColor] setFill];
+    NSRectFill(dirtyRect);
+}
+
+@end
+
+@interface QtMacToolbarDelegate : NSObject <NSToolbarDelegate>
+{
+@public
+    NSToolbar *toolbar;
+}
+
+- (id)init;
+- (NSToolbarItem *) toolbar: (NSToolbar *)toolbar itemForItemIdentifier: (NSString *) itemIdent willBeInsertedIntoToolbar:(BOOL) willBeInserted;
+- (NSArray *)toolbarDefaultItemIdentifiers:(NSToolbar*)tb;
+- (NSArray *)toolbarAllowedItemIdentifiers:(NSToolbar*)toolbar;
+- (NSArray *)toolbarSelectableItemIdentifiers:(NSToolbar *)toolbar;
+@end
+
+@implementation QtMacToolbarDelegate
+
+- (id)init
+{
+    self = [super init];
+    if (self) {
+    }
+    return self;
+}
+
+- (void)dealloc
+{
+    [super dealloc];
+}
+
+- (NSArray *)toolbarDefaultItemIdentifiers:(NSToolbar*)tb
+{
+    Q_UNUSED(tb);
+    NSMutableArray *array = [[[NSMutableArray alloc] init] autorelease];
+//    [array addObject : NSToolbarPrintItemIdentifier];
+//    [array addObject : NSToolbarShowColorsItemIdentifier];
+    [array addObject : @"filledView"];
+    return array;
+}
+
+- (NSArray *)toolbarAllowedItemIdentifiers:(NSToolbar*)tb
+{
+    Q_UNUSED(tb);
+    NSMutableArray *array = [[[NSMutableArray alloc] init] autorelease];
+//    [array addObject : NSToolbarPrintItemIdentifier];
+//    [array addObject : NSToolbarShowColorsItemIdentifier];
+    [array addObject : @"filledView"];
+    return array;
+}
+
+- (NSArray *)toolbarSelectableItemIdentifiers: (NSToolbar *)tb
+{
+    Q_UNUSED(tb);
+    NSMutableArray *array = [[[NSMutableArray alloc] init] autorelease];
+    return array;
+}
+
+- (IBAction)itemClicked:(id)sender
+{
+
+}
+
+- (NSToolbarItem *) toolbar: (NSToolbar *)tb itemForItemIdentifier: (NSString *) itemIdentifier willBeInsertedIntoToolbar:(BOOL) willBeInserted
+{
+    Q_UNUSED(tb);
+    Q_UNUSED(willBeInserted);
+    //const QString identifier = toQString(itemIdentifier);
+    //NSToolbarItem *toolbarItem = [[[NSToolbarItem alloc] initWithItemIdentifier: itemIdentifier] autorelease];
+    //return toolbarItem;
+
+    //NSToolbarItem *toolbarItem = [[[NSToolbarItem alloc] initWithItemIdentifier: itemIdentifier] autorelease];
+    NSToolbarItem *toolbarItem = [[[NSToolbarItem alloc] initWithItemIdentifier: itemIdentifier] autorelease];
+    FilledView *theView = [[FilledView alloc] init];
+    [toolbarItem setView : theView];
+    [toolbarItem setMinSize : NSMakeSize(400, 40)];
+    [toolbarItem setMaxSize : NSMakeSize(4000, 40)];
+    return toolbarItem;
+}
+@end
+
+@interface WindowAndViewAndQtCreator : NSObject {}
+- (void)createWindowAndViewAndQt;
+@end
+
+@implementation WindowAndViewAndQtCreator
+- (void)createWindowAndViewAndQt {
+
+    // Create the window
+    NSRect frame = NSMakeRect(500, 500, 500, 500);
+    NSWindow* window  = [[NSWindow alloc] initWithContentRect:frame
+                        styleMask:NSTitledWindowMask |  NSClosableWindowMask | NSMiniaturizableWindowMask | NSResizableWindowMask
+                        backing:NSBackingStoreBuffered
+                        defer:NO];
+
+    NSString *title = @"This the NSWindow window";
+    [window setTitle:title];
+
+    [window setBackgroundColor:[NSColor blueColor]];
+
+    // Create a tool bar, set Qt delegate
+    NSToolbar *toolbar = [[NSToolbar alloc] initWithIdentifier : @"foobartoolbar"];
+    QtMacToolbarDelegate *delegate = [[QtMacToolbarDelegate alloc] init];
+    [toolbar setDelegate : delegate];
+    [window setToolbar : toolbar];
+
+    // Create the QWindow, don't show it.
+    Window *qtWindow = new Window();
+    qtWindow->create();
+
+    //QSGView *qtWindow = new QSGView();
+    //qtWindow->setSource(QUrl::fromLocalFile("/Users/msorvig/code/qt5/qtdeclarative/examples/declarative/samegame/samegame.qml"));
+ //   qtWindow->setWindowFlags(Qt::WindowType(13)); // 13: NativeEmbeddedWindow
+
+    // Get the nsview from the QWindow, set it as the content view
+    // on the NSWindow created above.
+    QPlatformNativeInterface *platformNativeInterface = QGuiApplication::platformNativeInterface();
+    NSView *qtView = (NSView *)platformNativeInterface->nativeResourceForWindow("nsview", qtWindow);
+    [window setContentView:qtView];
+    [window makeKeyAndOrderFront:NSApp];
+}
+@end
+
+int main(int argc, char *argv[])
+{
+    QGuiApplication app(argc, argv);
+
+    // fake NSApplicationMain() implementation follows:
+    NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];
+    [NSApplication sharedApplication];
+
+    // schedule call to create the UI.
+    WindowAndViewAndQtCreator *windowAndViewAndQtCreator= [WindowAndViewAndQtCreator alloc];
+    [NSTimer scheduledTimerWithTimeInterval:0 target:windowAndViewAndQtCreator selector:@selector(createWindowAndViewAndQt) userInfo:nil repeats:NO];
+
+    [(NSApplication *)NSApp run];
+    [NSApp release];
+    [pool release];
+    exit(0);
+    return 0;
+}
+
+
+

tests/manual/cocoa/qt_on_cocoa/qt_on_cocoa.pro

@@ -0,0 +1,12 @@
+TEMPLATE = app
+
+OBJECTIVE_SOURCES += main.mm
+HEADERS += window.h
+SOURCES += window.cpp
+LIBS += -framework Cocoa
+
+QMAKE_INFO_PLIST = Info_mac.plist
+OTHER_FILES = Info_mac.plist
+QT += gui widgets widgets-private gui-private core-private
+
+QT += declarative

tests/manual/cocoa/qt_on_cocoa/window.cpp

@@ -0,0 +1,203 @@
+/****************************************************************************
+**
+** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the test suite of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** GNU Lesser General Public License Usage
+** This file may be used under the terms of the GNU Lesser General Public
+** License version 2.1 as published by the Free Software Foundation and
+** appearing in the file LICENSE.LGPL included in the packaging of this
+** file. Please review the following information to ensure the GNU Lesser
+** General Public License version 2.1 requirements will be met:
+** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain additional
+** rights. These rights are described in the Nokia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU General
+** Public License version 3.0 as published by the Free Software Foundation
+** and appearing in the file LICENSE.GPL included in the packaging of this
+** file. Please review the following information to ensure the GNU General
+** Public License version 3.0 requirements will be met:
+** http://www.gnu.org/copyleft/gpl.html.
+**
+** Other Usage
+** Alternatively, this file may be used in accordance with the terms and
+** conditions contained in a signed written agreement between you and Nokia.
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "window.h"
+
+#include <private/qguiapplication_p.h>
+
+#include <QBackingStore>
+#include <QPainter>
+#include <QtGui>
+
+static int colorIndexId = 0;
+
+QColor colorTable[] =
+{
+    QColor("#f09f8f"),
+    QColor("#a2bff2"),
+    QColor("#c0ef8f")
+};
+
+Window::Window(QScreen *screen)
+    : QWindow(screen)
+    , m_backgroundColorIndex(colorIndexId++)
+{
+    initialize();
+}
+
+Window::Window(QWindow *parent)
+    : QWindow(parent)
+    , m_backgroundColorIndex(colorIndexId++)
+{
+    initialize();
+}
+
+void Window::initialize()
+{
+    if (parent())
+        setGeometry(QRect(160, 120, 320, 240));
+    else {
+        setGeometry(QRect(10, 10, 640, 480));
+
+        setSizeIncrement(QSize(10, 10));
+        setBaseSize(QSize(640, 480));
+        setMinimumSize(QSize(240, 160));
+        setMaximumSize(QSize(800, 600));
+    }
+
+    create();
+    m_backingStore = new QBackingStore(this);
+
+    m_image = QImage(geometry().size(), QImage::Format_RGB32);
+    m_image.fill(colorTable[m_backgroundColorIndex % (sizeof(colorTable) / sizeof(colorTable[0]))].rgba());
+
+    m_lastPos = QPoint(-1, -1);
+    m_renderTimer = 0;
+}
+
+void Window::mousePressEvent(QMouseEvent *event)
+{
+    m_lastPos = event->pos();
+}
+
+void Window::mouseMoveEvent(QMouseEvent *event)
+{
+    if (m_lastPos != QPoint(-1, -1)) {
+        QPainter p(&m_image);
+        p.setRenderHint(QPainter::Antialiasing);
+        p.drawLine(m_lastPos, event->pos());
+        m_lastPos = event->pos();
+    }
+
+    scheduleRender();
+}
+
+void Window::mouseReleaseEvent(QMouseEvent *event)
+{
+    if (m_lastPos != QPoint(-1, -1)) {
+        QPainter p(&m_image);
+        p.setRenderHint(QPainter::Antialiasing);
+        p.drawLine(m_lastPos, event->pos());
+        m_lastPos = QPoint(-1, -1);
+    }
+
+    scheduleRender();
+}
+
+void Window::exposeEvent(QExposeEvent *)
+{
+    scheduleRender();
+}
+
+void Window::resizeEvent(QResizeEvent *)
+{
+    QImage old = m_image;
+
+    //qDebug() << "Window::resizeEvent" << width << height;
+
+    int width = qMax(geometry().width(), old.width());
+    int height = qMax(geometry().height(), old.height());
+
+    if (width > old.width() || height > old.height()) {
+        m_image = QImage(width, height, QImage::Format_RGB32);
+        m_image.fill(colorTable[(m_backgroundColorIndex) % (sizeof(colorTable) / sizeof(colorTable[0]))].rgba());
+
+        QPainter p(&m_image);
+        p.drawImage(0, 0, old);
+    }
+
+    render();
+}
+
+void Window::keyPressEvent(QKeyEvent *event)
+{
+    switch (event->key()) {
+    case Qt::Key_Backspace:
+        m_text.chop(1);
+        break;
+    case Qt::Key_Enter:
+    case Qt::Key_Return:
+        m_text.append('\n');
+        break;
+    default:
+        m_text.append(event->text());
+        break;
+    }
+    scheduleRender();
+}
+
+void Window::scheduleRender()
+{
+    if (!m_renderTimer)
+        m_renderTimer = startTimer(1);
+}
+
+void Window::timerEvent(QTimerEvent *)
+{
+    render();
+    killTimer(m_renderTimer);
+    m_renderTimer = 0;
+}
+
+void Window::render()
+{
+    QRect rect(QPoint(), geometry().size());
+
+    m_backingStore->resize(rect.size());
+
+    m_backingStore->beginPaint(rect);
+
+    QPaintDevice *device = m_backingStore->paintDevice();
+
+    QPainter p(device);
+    p.drawImage(0, 0, m_image);
+
+    QFont font;
+    font.setPixelSize(32);
+
+    p.setFont(font);
+    p.drawText(rect, 0, m_text);
+
+    m_backingStore->endPaint();
+    m_backingStore->flush(rect);
+}
+
+

tests/manual/cocoa/qt_on_cocoa/window.h

@@ -0,0 +1,74 @@
+/****************************************************************************
+**
+** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the test suite of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** GNU Lesser General Public License Usage
+** This file may be used under the terms of the GNU Lesser General Public
+** License version 2.1 as published by the Free Software Foundation and
+** appearing in the file LICENSE.LGPL included in the packaging of this
+** file. Please review the following information to ensure the GNU Lesser
+** General Public License version 2.1 requirements will be met:
+** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain additional
+** rights. These rights are described in the Nokia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU General
+** Public License version 3.0 as published by the Free Software Foundation
+** and appearing in the file LICENSE.GPL included in the packaging of this
+** file. Please review the following information to ensure the GNU General
+** Public License version 3.0 requirements will be met:
+** http://www.gnu.org/copyleft/gpl.html.
+**
+** Other Usage
+** Alternatively, this file may be used in accordance with the terms and
+** conditions contained in a signed written agreement between you and Nokia.
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include <QWindow>
+#include <QImage>
+
+class Window : public QWindow
+{
+public:
+    Window(QWindow *parent = 0);
+    Window(QScreen *screen);
+
+protected:
+    void mousePressEvent(QMouseEvent *);
+    void mouseMoveEvent(QMouseEvent *);
+    void mouseReleaseEvent(QMouseEvent *);
+
+    void keyPressEvent(QKeyEvent *);
+
+    void exposeEvent(QExposeEvent *);
+    void resizeEvent(QResizeEvent *);
+
+    void timerEvent(QTimerEvent *);
+
+private:
+    void render();
+    void scheduleRender();
+    void initialize();
+
+    QString m_text;
+    QImage m_image;
+    QPoint m_lastPos;
+    int m_backgroundColorIndex;
+    QBackingStore *m_backingStore;
+    int m_renderTimer;
+};