How to have a window move and repaint simultaneously?
-
I'm implementing a screen magnifier window using a QWidget-subclassed window. I have some platform specific code to grab a portion of the screen and render it to a QPixmap.
In order for it to not render in a jittery fashion, what I then need to do is have my window move itself and repaint simultaneously.
Currently my method is to have a timer fire at a rapid rate (around 60 times per second), and its callback function performs the screen capture, moves the window and then immediately calls
repaint()right after the call tomove(). This seems to do the trick, and although Qt's docs recommend against usingrepaint()this seems like a legitimate use case for it.However I'm wondering, is this the correct method? Or is there perhaps a better one?
-
I'm implementing a screen magnifier window using a QWidget-subclassed window. I have some platform specific code to grab a portion of the screen and render it to a QPixmap.
In order for it to not render in a jittery fashion, what I then need to do is have my window move itself and repaint simultaneously.
Currently my method is to have a timer fire at a rapid rate (around 60 times per second), and its callback function performs the screen capture, moves the window and then immediately calls
repaint()right after the call tomove(). This seems to do the trick, and although Qt's docs recommend against usingrepaint()this seems like a legitimate use case for it.However I'm wondering, is this the correct method? Or is there perhaps a better one?
@Guy-Gizmo said in How to have a window move and repaint simultaneously?:
its callback function performs the screen capture
Maybe you could do the whole screen capture once at the beginning? Then only magnify the part which your currently need.
