[Qt-interest] How to repaint the screen directly

[Song Shiyue]

hi all:

  How to repaint the screen when I want.

  I use the function "QWidget::repaint()".
  But when there are nothing changed in the widget.
this function can't repaint the screen.
  In my case, another program maybe write frame buffer directly.
  So I must repaint the screen when i want.
  How can i do that?
  Thanks.
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