BoulderBum
Programmer
What is the difference between Invalidate() and Refresh() in Windows programming?
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Difference Between Invalidate() and Refresh()
- Thread starter BoulderBum
- Start date
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I see the following differences:
- Refresh() forces a control to call invalidate() to itself immediately
(its client area) and also the child controls.
- The Invalidate() causes a paint message to be send to the control.
Example: In a form a picture is added in a client area at run time depending on where the mouse points.
To force the form to be redrawn with the image a call of thisForm.Invalidate() is mandatory;
- The Refresh() could be overriden but no Invalidate().
-obislavu-
- Refresh() forces a control to call invalidate() to itself immediately
(its client area) and also the child controls.
- The Invalidate() causes a paint message to be send to the control.
Example: In a form a picture is added in a client area at run time depending on where the mouse points.
To force the form to be redrawn with the image a call of thisForm.Invalidate() is mandatory;
- The Refresh() could be overriden but no Invalidate().
-obislavu-
- Status
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