QPaintDeviceWindowis like a regular
QWindow, with the added functionality of being a paint device too. Whenever the content needs to be updated, the virtual
paintEvent()function is called. Subclasses, that reimplement this function, can then simply open a
QPainteron the window.
This class cannot directly be used in applications. It rather serves as a base for subclasses like
Handles paint events passed in the
The default implementation does nothing. Reimplement this function to perform painting. If necessary, the dirty area is retrievable from the
Marks the entire window as dirty and schedules a repaint.
Subsequent calls to this function before the next paint event will get ignored.
For non-exposed windows the update is deferred until the window becomes exposed again.
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