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The resize event should not be used to draw, as there will be a follow-up exposeEvent delivered just after, and we don't want to draw twice. This is how QRasterWindow operates too, except it defers the backingstore resize to beginPaint() instead of resizing in the reizeEvent. It's also how QOpenGLWindow operates, which also has a note for the virtual resizeGL method saying: "Scheduling updates from here is not necessary. The windowing systems will send expose events that trigger an update automatically." Change-Id: I2a9740018508c2eb129149f53237ee8e378c03b1 Reviewed-by: Simon Hausmann <simon.hausmann@qt.io>
Qt is supplied with a number of example applications that have been written to provide developers with examples of the Qt API in use, highlight good programming practice, and showcase features found in each of Qt's core technologies. Documentation for examples can be found in the Examples section of the Qt documentation.