Task panel group display updates

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   I have a task panel that I add multiple groups to. I am adding a dialog box as the item in each group. I have one group expanded.

I have noticed that as I move the mouse over one of the group captions (expanded group or unexpanded) everything in the panel's dialogs "flickers".

I set a break in one of my dialog's OnCtlColor and when I move the cursor over any caption, the entire dialog box appears to be asked to redisplay by Windows. That is, by examining the call stack I note no codejock calls on the stack and the display seems to be the result of windows simply handling an update request.

How do I stop a mouse event occurring over one group caption from causing items in another group from being redisplayed?

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rdhd Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: 13 August 2007 Location: United States Status: Offline Points: 867	Post Options Post Reply Quote rdhd Report Post Thanks(0) Quote Reply Topic: Task panel group display updates Posted: 04 September 2007 at 2:50pm
	I have a task panel that I add multiple groups to. I am adding a dialog box as the item in each group. I have one group expanded. I have noticed that as I move the mouse over one of the group captions (expanded group or unexpanded) everything in the panel's dialogs "flickers". I set a break in one of my dialog's OnCtlColor and when I move the cursor over any caption, the entire dialog box appears to be asked to redisplay by Windows. That is, by examining the call stack I note no codejock calls on the stack and the display seems to be the result of windows simply handling an update request. How do I stop a mouse event occurring over one group caption from causing items in another group from being redisplayed?

rdhd Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: 13 August 2007 Location: United States Status: Offline Points: 867	Post Options Post Reply Quote rdhd Report Post Thanks(0) Quote Reply Posted: 04 September 2007 at 4:02pm
	Progres ... I am actually experiencing a number of issues with flickering/flashing windows. For the task panel, I have tracked the problem to CXTPTaskPanel::SetHotItem. When the hot item changes, the method makes this call that invalidates the entire client area: Invalidate(FALSE); Likewise I have the same issue with XTPPopupControl. When the HitTest call returns an item, CXTPPopupControl calls RedrawControl and RedrawControl does an Invalidate(FALSE). So now I know the immediate cause of everything updating all the time. But this forced update of everything seems unnecessary. What is the reason for invalidating the entire panel (and popup?) In the very least it seems reasonable to get the hit item's rectangle and invalidate only the rectangle. Actually, for the task panel, why would the contents of a group (the items) need to be redrawn simply because I moved the group's caption? Likewise, for a popup control, why would a mouse hit on one item result in the need to update all the items?