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QMacNativeWidget Class

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. More...

 #include <QMacNativeWidget>

Inherits: QWidget.

This class was introduced in Qt 4.5.

Public Types

enum PaintDeviceMetric { PdmWidth, PdmHeight, PdmWidthMM, PdmHeightMM, ..., PdmPhysicalDpiY }

Public Functions

QMacNativeWidget(void * parentView = 0)
~QMacNativeWidget()
virtual ~QPaintDevice()
int colorCount() const
int depth() const
int height() const
int heightMM() const
int logicalDpiX() const
int logicalDpiY() const
virtual QPaintEngine * paintEngine() const = 0
bool paintingActive() const
int physicalDpiX() const
int physicalDpiY() const
int width() const
int widthMM() const

Reimplemented Public Functions

virtual QSize sizeHint() const
  • 215 public functions inherited from QWidget
  • 31 public functions inherited from QObject

Protected Functions

QPaintDevice()
virtual void init(QPainter * painter) const
virtual int metric(PaintDeviceMetric metric) const
virtual QPaintDevice * redirected(QPoint * offset) const
virtual QPainter * sharedPainter() const

Reimplemented Protected Functions

virtual bool event(QEvent * ev)
  • 37 protected functions inherited from QWidget
  • 9 protected functions inherited from QObject

Additional Inherited Members

  • 58 properties inherited from QWidget
  • 1 property inherited from QObject
  • 19 public slots inherited from QWidget
  • 1 public slot inherited from QObject
  • 1 signal inherited from QWidget
  • 2 signal inherited from QObject
  • 4 static public members inherited from QWidget
  • 11 static public members inherited from QObject
  • 1 protected slot inherited from QWidget

Detailed Description

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.

On Mac OS X, there is a difference between a window and view; normally expressed as widgets in Qt. Qt makes assumptions about its parent-child hierarchy that make it complex to put an arbitrary Qt widget into a hierarchy of "normal" views from Apple frameworks. QMacNativeWidget bridges the gap between views and windows and makes it possible to put a hierarchy of Qt widgets into a non-Qt window or view.

QMacNativeWidget pretends it is a window (i.e. isWindow() will return true), but it cannot be shown on its own. It needs to be put into a window when it is created or later through a native call.

QMacNativeWidget works for either Carbon or Cocoa depending on how Qt was configured. If Qt is using Carbon, QMacNativeWidget will embed into Carbon hierarchies. If Qt is using Cocoa, QMacNativeWidget embeds into Cocoa hierarchies.

Here is an example of putting a QPushButton into a NSWindow:

     NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
     NSWindow *window = [[NSWindow alloc] initWithContentRect:NSMakeRect(200, app.desktop()->height() - 200, 239, 200)
                         styleMask:NSTitledWindowMask | NSClosableWindowMask
                                   | NSMiniaturizableWindowMask | NSResizableWindowMask
                         backing:NSBackingStoreBuffered defer:NO];

     QMacNativeWidget *nativeWidget = new QMacNativeWidget();
     nativeWidget->move(0, 0);
     nativeWidget->setPalette(QPalette(Qt::red));
     nativeWidget->setAutoFillBackground(true);
     QVBoxLayout *layout = new QVBoxLayout();
     QPushButton *pushButton = new QPushButton("An Embedded Qt Button!", nativeWidget);
     pushButton->setAttribute(Qt::WA_LayoutUsesWidgetRect); // Don't use the layout rect calculated from QMacStyle.
     layout->addWidget(pushButton);
     nativeWidget->setLayout(layout);

     // Adjust Cocoa layouts
     NSView *nativeWidgetView = reinterpret_cast<NSView *>(nativeWidget->winId());
     NSView *contentView = [window contentView];
     [contentView setAutoresizesSubviews:YES];
     [nativeWidgetView setAutoresizingMask:NSViewWidthSizable | NSViewHeightSizable];
     [nativeWidgetView setAutoresizesSubviews:YES];
     NSView *pushButtonView = reinterpret_cast<NSView *>(pushButton->winId());
     [pushButtonView setAutoresizingMask:NSViewWidthSizable];

     // Add the nativeWidget to the window.
     [contentView addSubview:nativeWidgetView positioned:NSWindowAbove relativeTo:nil];
     nativeWidget->show();
     pushButton->show();

     // Show the window.
     [window makeKeyAndOrderFront:window];
     [pool release];

On Carbon, this would do the equivalent:


Note that QMacNativeWidget requires knowledge of Carbon or Cocoa. All it does is get the Qt hierarchy into a window not owned by Qt. It is then up to the programmer to ensure it is placed correctly in the window and responds correctly to events.

Member Function Documentation

QMacNativeWidget::QMacNativeWidget(void * parentView = 0)

Create a QMacNativeWidget with parentView as its "superview" (i.e., parent). The parentView is either an HIViewRef if Qt is using Carbon or a NSView pointer if Qt is using Cocoa.

QMacNativeWidget::~QMacNativeWidget()

Destroy the QMacNativeWidget.

bool QMacNativeWidget::event(QEvent * ev) [virtual protected]

Reimplemented from QObject::event().

QSize QMacNativeWidget::sizeHint() const [virtual]

Reimplemented from QWidget::sizeHint().

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