Submitted by Anonymous (not verified) on Fri, 06/15/2012 - 12:07
Is there a way to change the background, foreground, etc. of an XmManager and all of its children without generating multiple Expose events? In other words, can I traverse the Widget tree starting from the XmManager and call XClearArea (or a similar function) in the end? Does each individual Widget window need an Expose or would exposing the containing window redraw them all? I know that using XtSetValues can cause multiple Expose events. Would it be better to call the Core and Constraint set_values functions myself and Expose once in the end or is this considered too dangerous? Thanks.
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Wed, 06/21/2006 - 07:59#1
How to get fewer Expose events when changing many Widgets
I'm working on a viewport like widget that has 2000+ children, and my application runs like slug when i have to translate the viewport, because I have to translate 2000+ children in a second. So I change the widget record directly (w->core.x, w->core.y, etc.) and calling XClearArea in the end, then my application runs normal again and the hell is gone.
You can set the compress_exposure of your composite widget to either XtExposeCompressMultiple / XtExposeCompressMaximal, but this way doesn't help too much in my case.
I think there is no other way....