[Interest] Update widget geometry BEFORE window shown

[John Weeks]

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.

> On May 23, 2024, at 3:52 PM, David M. Cotter <dave at kjams.com> wrote:
> 
> I need to do something like this:
> 
> windowP->layout()->updateGeometry(); // causes all widget geometry to update
> DoSomethingImportant(windowP->GetWidget(“someWidget”).geometry()); // do something with the geometry of a widget (which must be up to date)
> windowP->setGeometry(windowP->GetInitialGeometry()); // pos/size now based on the fact that we KNOW the geometry of one of the widgets BEFORE the window is shown
> windowP->show(); // only NOW show the window, NOT before now
> 
> How do I do something like the first line? Cause all widget geometry (Recursively), to know / figure out its size AND position? And this BEFORE the window or any widget is “shown”  via the windowP->show() command?
> 
> Please don’t try to tell me to do it differently. If you don’ know how to answer it, please don’t chime in, thanks.
> 
> -Dave
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