[Interest] Update widget geometry BEFORE window shown

[David M. Cotter]

Tried something like that:

				qWidgetP->setAttribute(Qt::WA_DontShowOnScreen, true);
				qWidgetP->show();
				qWidgetP->hide();
				qWidgetP->setAttribute(Qt::WA_DontShowOnScreen, false);

It doesn’t do as advertised (window does not show, but also doesn’t lay out the geometry of widgets)

-dave

> On May 29, 2024, at 11:29 AM, John Weeks <john at wavemetrics.com> wrote:
> 
> Well, I wasn't going to say anything ("If you don’ know how to answer it, please don’t chime in, thanks.")
> 
> In my experience, Qt doesn't maintain a good notion of a window's size until it's shown. But you are guaranteed a Resize event as the window is being shown, so if you can manage it, you need to handle the Resize event and do your polishing and layouting there.
> 
> In fact, I had for a while a function called ShowAndHideInvisibly(); the important part of it was like this:
>> 	getQWidget()->setAttribute(Qt::WA_DontShowOnScreen, true);
>> 	WMshow();
>> 	WMhide();
>> 	getQWidget()->setAttribute(Qt::WA_DontShowOnScreen, false);
> 
> Maybe that helps. Setting the attribute prevents the screen flash.
> 
> -John Weeks
> WaveMetrics, Inc.

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