I am using .net 2.0 and working in VS2005.
I've noticed following unpleasant effect in the standard Form class
behaviour: when the Form is hovered by some other window, it is being redrawn very slowly.
Here is the example. I have taken empty form, put there some standard controls:
http://www.ljplus.ru/img4/b/o/boshetunmaj/Redraw2.jpg
My hardware conf is: p4 3200, 2 Gb ram, GeForce 5200.
24  3253 
I have found that controls redraw at this moment takes up to 80% of CPU time...
Plater 7,872
Recognized Expert Expert
I have never had that occurance unless my computer is super bogged down with a lot of applications.
Might I suggest checking your windows theme/style settings? The P4 might not be able to hand it if you have a LOT of controls on your windows.
I have never had that occurance unless my computer is super bogged down with a lot of applications.
Might I suggest checking your windows theme/style settings? The P4 might not be able to hand it if you have a LOT of controls on your windows.
It's strange, but there are only few controls. The most noticable effect is for TextBoxes, ComboBoxes and GroupBoxes.
Which one setting do you mean?
Plater 7,872
Recognized Expert Expert
Hmm, I turn off most of the themeing on my computer so I'm not sure it even has any bearing on it.
Are you doing anything else with the form? Doing anything durring paint/redraw events? Or populating data from a database or anything?
Hmm, I turn off most of the themeing on my computer so I'm not sure it even has any bearing on it.
Are you doing anything else with the form? Doing anything durring paint/redraw events? Or populating data from a database or anything?
The form is free from any code.
I have set DoubleBuffered property of groupboxes to true and this helped a little, but the problem still stays.
I have found the following effect:
I create multi window app (I run another window in another thread) and catch
events concerning moving and resizing of that other window. On each such event I run DoEvents() in a main thread. This leads to perferct window redraw.
But I can't understand, how to do the same with windows of 3rd side applications.
Can anybode help?
Plater 7,872
Recognized Expert Expert
Ah!
So this window was not running in the GUI thread but in a different thread?
Ah!
So this window was not running in the GUI thread but in a different thread?
Yes, I've created BackgroundWorke r in the main GUI thread and asked it to do
Run.Application (AnotherWindow) ;
In this case I've no such awful effect as it was described in the 1st post.
That's because I can catch events from this window.
Plater 7,872
Recognized Expert Expert
I thought you were having trouble with the "main" window. Makes sense that the window in the other thread had trouble with redraws.
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