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Diffstat (limited to 'src/gui/painting/qunifiedtoolbarsurface_mac_p.h')
| -rw-r--r-- | src/gui/painting/qunifiedtoolbarsurface_mac_p.h | 33 |
1 files changed, 33 insertions, 0 deletions
diff --git a/src/gui/painting/qunifiedtoolbarsurface_mac_p.h b/src/gui/painting/qunifiedtoolbarsurface_mac_p.h index 0a7ebf1..ce07f5c 100644 --- a/src/gui/painting/qunifiedtoolbarsurface_mac_p.h +++ b/src/gui/painting/qunifiedtoolbarsurface_mac_p.h @@ -65,6 +65,39 @@ QT_BEGIN_NAMESPACE class QNativeImage; +// +// This is the implementation of the unified toolbar on Mac OS X +// with the graphics system raster. +// +// General idea: +// ------------- +// We redirect the painting of widgets inside the unified toolbar +// to a special window surface, the QUnifiedToolbarSurface. +// We need a separate window surface because the unified toolbar +// is out of the content view. +// The input system is the same as for the unified toolbar with the +// native (CoreGraphics) engine. +// +// Execution flow: +// --------------- +// The unified toolbar is triggered by QMainWindow::setUnifiedTitleAndToolBarOnMac(). +// It calls QMainWindowLayout::insertIntoMacToolbar() which will +// set all the appropriate variables (offsets, redirection, ...). +// When Qt tells a widget to repaint, QWidgetPrivate::drawWidget() +// checks if the widget is inside the unified toolbar and exits without +// painting is that is the case. +// We trigger the rendering of the unified toolbar in QWidget::repaint() +// and QWidget::update(). +// We keep track of flush requests via "flushRequested" variable. That +// allow flush() to be a no-op if no repaint occurred for a widget. +// We rely on the needsDisplay: and drawRect: mecanism for drawing our +// content into the graphics context. +// +// Notes: +// ------ +// The painting of items inside the unified toolbar is expensive. +// Too many repaints will drastically slow down the whole application. +// class QUnifiedToolbarSurfacePrivate { |