From Robert Osfield, changed Roni's code to use a #define GETDEVICEPIXELRATIO to access the versioned Qt devicePixelRatio() method to avoid duplication of the Qt version checking.
- renamed osgQt::GraphWidget to osgQt::GLWidget
as it better fits to Qt naming (osgQt::GLWidget is derived from QGLWidget
while recent GraphWidget... it is unclear, maybe QGraphicsView,
QGraphicsScene,....)
- added the code to properly manage ON_DEMAND rendering scheme
(involves osgQt::setViewer() and internal HeartBeat class)
- added forward key events functionality. It allows to not eat the key events
by GLWidget, but it forwards them to Qt processing as well.
- destroying GLWidget before GraphicsWindowQt and vice versa does not crash
the application
- it is possible to request particular QGLFormat in GLWidget constructor
- added QtWindowingSystem class
- multithread OSG rendering improvements/fixes
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From Robert Osfield, added back in getGraphWidget() method for backwards compatibility.