Port QMacNativeWidget to Qt 5

Also adds examples/widgets/mac subdir for Mac specific examples,
starting with one for this feature.

Change-Id: I4cc7d84ce3d7562259d6206faa5d6996c2392a3e
Reviewed-by: Liang Qi <liang.qi@digia.com>

examples/widgets/mac/mac.pro

@@ -0,0 +1,5 @@
+TEMPLATE = subdirs
+macx {
+    SUBDIRS = \
+            qmacnativewidget
+}

examples/widgets/mac/qmacnativewidget/main.mm

@@ -0,0 +1,142 @@
+/****************************************************************************
+**
+** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
+** Contact: http://www.qt-project.org/legal
+**
+** This file is part of the test suite of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and Digia.  For licensing terms and
+** conditions see http://qt.digia.com/licensing.  For further information
+** use the contact form at http://qt.digia.com/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, 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, Digia gives you certain additional
+** rights.  These rights are described in the Digia 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.
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#import <Cocoa/Cocoa.h>
+
+#include <QApplication>
+#include <QDebug>
+#include <QHBoxLayout>
+#include <QLineEdit>
+#include <QPainter>
+#include <QPushButton>
+#include <QVBoxLayout>
+#include <QWidget>
+#include <QMacNativeWidget>
+
+class RedWidget : public QWidget
+{
+public:
+    RedWidget() {
+
+    }
+
+    void resizeEvent(QResizeEvent *)
+    {
+        qDebug() << "RedWidget::resize" << size();
+    }
+
+    void paintEvent(QPaintEvent *event)
+    {
+        QPainter p(this);
+        Q_UNUSED(event);
+        QRect rect(QPoint(0, 0), size());
+        qDebug() << "Painting geometry" << rect;
+        p.fillRect(rect, QColor(133, 50, 50));
+    }
+};
+
+namespace {
+int qtArgc = 0;
+char **qtArgv;
+QApplication *qtApp = 0;
+}
+
+@interface WindowCreator : NSObject {}
+- (void)createWindow;
+@end
+
+@implementation WindowCreator
+- (void)createWindow {
+    // Qt widgets rely on a QApplication being alive somewhere
+    qtApp = new QApplication(qtArgc, qtArgv);
+
+    // Create the NSWindow
+    NSRect frame = NSMakeRect(500, 500, 500, 500);
+    NSWindow* window  = [[NSWindow alloc] initWithContentRect:frame
+                        styleMask:NSTitledWindowMask |  NSClosableWindowMask | NSMiniaturizableWindowMask | NSResizableWindowMask
+                        backing:NSBackingStoreBuffered
+                        defer:NO];
+    [window setTitle:@"NSWindow"];
+
+    // Create widget hierarchy with QPushButton and QLineEdit
+    QMacNativeWidget *nativeWidget = new QMacNativeWidget();
+    // Get the NSView for QMacNativeWidget and set it as the content view for the NSWindow
+    [window setContentView:nativeWidget->nativeView()];
+
+    QHBoxLayout *hlayout = new QHBoxLayout();
+    hlayout->addWidget(new QPushButton("Push", nativeWidget));
+    hlayout->addWidget(new QLineEdit(nativeWidget));
+
+    QVBoxLayout *vlayout = new QVBoxLayout();
+    vlayout->addLayout(hlayout);
+
+    //RedWidget * redWidget = new RedWidget;
+    //vlayout->addWidget(redWidget);
+
+    nativeWidget->setLayout(vlayout);
+
+
+    // show() must be called on nativeWiget to get the widgets int he correct state.
+    nativeWidget->show();
+
+    // Show the NSWindow
+    [window makeKeyAndOrderFront:NSApp];
+}
+@end
+
+int main(int argc, char *argv[])
+{
+    NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];
+
+    // Normally, we would use the application delegate.
+    // We resort to the notification mechanism for conciseness.
+    WindowCreator *windowCreator= [WindowCreator alloc];
+    [[NSNotificationCenter defaultCenter]
+            addObserver:windowCreator selector:@selector(createWindow)
+            name:NSApplicationDidFinishLaunchingNotification object:nil];
+
+    // Save these for QApplication
+    qtArgc = argc;
+    qtArgv = argv;
+
+    // Other than the few lines above, it's business as usual...
+    return NSApplicationMain(argc, (const char **)argv);
+}

examples/widgets/mac/qmacnativewidget/qmacnativewidget.pro

@@ -0,0 +1,7 @@
+TEMPLATE = app
+
+OBJECTIVE_SOURCES += main.mm
+LIBS += -framework Cocoa
+
+QT += widgets
+#QT += widgets-private gui-private core-private

examples/widgets/widgets.pro

@@ -28,3 +28,4 @@ contains(QT_CONFIG, opengl(es1|es2)?) {
 !contains(QT_CONFIG, opengl(es1|es2)?): SUBDIRS -= windowcontainer
 contains(DEFINES, QT_NO_CURSOR): SUBDIRS -= mainwindows
 contains(DEFINES, QT_NO_DRAGANDDROP): SUBDIRS -= draganddrop
+mac:SUBDIRS += mac

src/widgets/widgets/qmacnativewidget_mac.h

@@ -44,20 +44,23 @@
 
 #include <QtWidgets/QWidget>
 
-QT_BEGIN_NAMESPACE
+Q_FORWARD_DECLARE_OBJC_CLASS(NSView);
 
+QT_BEGIN_NAMESPACE
 
 class QMacNativeWidgetPrivate;
 class Q_WIDGETS_EXPORT QMacNativeWidget : public QWidget
 {
     Q_OBJECT
 public:
-    QMacNativeWidget(void *parentRef = 0);
+    QMacNativeWidget(NSView *parentView = 0);
     ~QMacNativeWidget();
 
     QSize sizeHint() const;
+    NSView *nativeView() const;
 
 protected:
+    void init(NSView *parentView);
     bool event(QEvent *ev);
 
 private:

src/widgets/widgets/qmacnativewidget_mac.mm

@@ -40,15 +40,18 @@
 ****************************************************************************/
 
 #import <Cocoa/Cocoa.h>
-#import <private/qcocoaview_mac_p.h>
 #include "qmacnativewidget_mac.h"
-#include <private/qwidget_p.h>
+
+#include <QtCore/qdebug.h>
+#include <QtGui/qwindow.h>
+#include <QtGui/qguiapplication.h>
+#include <qpa/qplatformnativeinterface.h>
 
 /*!
     \class QMacNativeWidget
     \since 4.5
-    \brief The QMacNativeWidget class provides a widget for Mac OS X that provides a way to put Qt widgets into Carbon
-    or Cocoa hierarchies depending on how Qt was configured.
+    \brief The QMacNativeWidget class provides a widget for Mac OS X that provides
+    a way to put Qt widgets into Cocoa hierarchies.
 
     \ingroup advanced
     \inmodule QtWidgets
@@ -80,26 +83,47 @@
 
 QT_BEGIN_NAMESPACE
 
-class QMacNativeWidgetPrivate : public QWidgetPrivate
+namespace {
+// TODO use QtMacExtras copy of this function when available.
+inline QPlatformNativeInterface::NativeResourceForIntegrationFunction resolvePlatformFunction(const QByteArray &functionName)
 {
-};
+    QPlatformNativeInterface *nativeInterface = QGuiApplication::platformNativeInterface();
+    QPlatformNativeInterface::NativeResourceForIntegrationFunction function =
+        nativeInterface->nativeResourceFunctionForIntegration(functionName);
+    if (!function)
+         qWarning() << "Qt could not resolve function" << functionName
+                    << "from QGuiApplication::platformNativeInterface()->nativeResourceFunctionForIntegration()";
+    return function;
+}
+} //namespsace
 
-extern OSViewRef qt_mac_create_widget(QWidget *widget, QWidgetPrivate *widgetPrivate, OSViewRef parent);
+NSView *getEmbeddableView(QWindow *qtWindow)
+{
+    // Make sure the platform window is created
+    qtWindow->create();
 
+    // Inform the window that it's a subwindow of a non-Qt window. This must be
+    // done after create() because we need to have a QPlatformWindow instance.
+    // The corresponding NSWindow will not be shown and can be deleted later.
+    typedef void (*SetEmbeddedInForeignViewFunction)(QPlatformWindow *window, bool embedded);
+    reinterpret_cast<SetEmbeddedInForeignViewFunction>(resolvePlatformFunction("setEmbeddedInForeignView"))(qtWindow->handle(), true);
+
+    // Get the Qt content NSView for the QWindow from the Qt platform plugin
+    QPlatformNativeInterface *platformNativeInterface = QGuiApplication::platformNativeInterface();
+    NSView *qtView = (NSView *)platformNativeInterface->nativeResourceForWindow("nsview", qtWindow);
+    return qtView; // qtView is ready for use.
+}
 
 /*!
     Create a QMacNativeWidget with \a parentView as its "superview" (i.e.,
-    parent). The \a parentView is either an HIViewRef if Qt is using Carbon or
-    a NSView pointer if Qt is using Cocoa.
+    parent). The \a parentView is  a NSView pointer.
 */
-QMacNativeWidget::QMacNativeWidget(void *parentView)
-    : QWidget(*new QMacNativeWidgetPrivate, 0, Qt::Window)
+QMacNativeWidget::QMacNativeWidget(NSView *parentView)
+    : QWidget(0)
 {
-    Q_D(QMacNativeWidget);
-    OSViewRef myView = qt_mac_create_widget(this, d, OSViewRef(parentView));
+    Q_UNUSED(parentView);
 
-    d->topData()->embedded = true;
-    create(WId(myView), false, false);
+    //d_func()->topData()->embedded = true;
     setPalette(QPalette(Qt::transparent));
     setAttribute(Qt::WA_SetPalette, false);
     setAttribute(Qt::WA_LayoutUsesWidgetRect);
@@ -117,8 +141,19 @@ QMacNativeWidget::~QMacNativeWidget()
 */
 QSize QMacNativeWidget::sizeHint() const
 {
-    return QSize(200, 200);
+    // QMacNativeWidget really does not have any other choice
+    // than to fill its designated area.
+    if (windowHandle())
+        return windowHandle()->size();
+    return QWidget::sizeHint();
 }
+
+NSView *QMacNativeWidget::nativeView() const
+{
+    winId();
+    return getEmbeddableView(windowHandle());
+}
+
 /*!
     \reimp
 */

src/widgets/widgets/widgets.pri

@@ -142,20 +142,23 @@ SOURCES += \
         widgets/qplaintextedit.cpp
 
 macx {
+    HEADERS += \
+        widgets/qmacnativewidget_mac.h
+
     OBJECTIVE_SOURCES += \
-        widgets/qmenu_mac.mm
+        widgets/qmenu_mac.mm \
+        widgets/qmacnativewidget_mac.mm
 }
 
 # TODO
 false:mac {
-    HEADERS += widgets/qmacnativewidget_mac.h \
-               widgets/qmaccocoaviewcontainer_mac.h
+    HEADERS += widgets/qmaccocoaviewcontainer_mac.h
     OBJECTIVE_HEADERS += widgets/qcocoatoolbardelegate_mac_p.h \
                          widgets/qcocoamenu_mac_p.h
     OBJECTIVE_SOURCES += widgets/qmaccocoaviewcontainer_mac.mm \
                          widgets/qcocoatoolbardelegate_mac.mm \
                          widgets/qmainwindowlayout_mac.mm \
-                         widgets/qmacnativewidget_mac.mm \
+
 }
 
 wince*: {