You should not invalidate the window if the mouse only moves over it because that will lead to a WM_PAINT message ultimately. ... <看更多>

WM_PAINT message. The WM_PAINT message is sent when the system or another application makes a request to paint a portion of an application's window. ... <看更多>

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WM_PAINT response code is a convenient place to put rendering routines, especially when rendering in a window, but I believe - it is not the best. ... <看更多>