[Interest] Update widget geometry BEFORE window shown

[Axel Spoerl]

Hi David,

§1 Please don’t try to tell me to do it differently.
§2 If you don’ know how to answer it, please don’t chime in, thanks.

These instructions are a bit limiting, are they not?

In essence, you want a widget's geometry to be precise and up to date, before it has been shown.
That is done (under more), if QWidgetPrivate::updateGeometry_helper(true) is called.
There are three ways to achieve that on a hidden widget:

  *
setVisible(true), show() => probably not an option
  *
setMaximumSize()
  *
setMinimumSize() => under certain circumstances.

Except for the first code path shown, all others cause the helper to be called with a "false" argument, hence the result is not to your liking.
I haven't debugged with negative co-ordinates. Maybe it works. However, I would be reluctant to depend on something like that.
There are hacky ways, like re-implementing geometry calculation in the application, linking to WidgetsPrivate. I guess you have discarded those for good reasons.

With §1 in sight: Grinding stop.

Cheers
Axel
________________________________
Von: Interest <interest-bounces at qt-project.org> im Auftrag von coroberti <coroberti at gmail.com>
Gesendet: Montag, 27. Mai 2024 08:05
An: David M. Cotter <dave at kjams.com>
Cc: Qt Project <Interest at qt-project.org>
Betreff: Re: [Interest] Update widget geometry BEFORE window shown

Have you tried the suggestion from Henry to move the window first to the negative coordinates?

Kind regards,
Robert Iakobashvili
............................


On Mon, May 27, 2024 at 9:01 AM David M. Cotter <dave at kjams.com<mailto:dave at kjams.com>> wrote:
Does ANY ONE have any ideas on this?? Pretty please??

-dave

On May 24, 2024, at 12:14 PM, David M. Cotter <dave at kjams.com<mailto:dave at kjams.com>> wrote:

I’ve tried everything I can think of. The ONLY one that works the way I NEED is the first one, but that one flashes the window on the screen

#if 1
qWidgetP->show();
qWidgetP->hide();
QtLetTimersFire(0);
#endif

#if 0
QLayout* layoutP(qWidgetP->layout());

layoutP->update();
layoutP->activate();
QtLetTimersFire(0);
#endif

#if 0
for (auto* childP: qWidgetP->findChildren<QWidget*>()) {
childP->updateGeometry();
}

qWidgetP->updateGeometry();
QtLetTimersFire(0);
#endif

#if 0
qWidgetP->setAttribute(Qt::WA_DontShowOnScreen, true);
qWidgetP->show();
// qWidgetP->layout()->invalidate();
// qWidgetP->layout()->update();
// qWidgetP->layout()->activate();
qWidgetP->hide();
qWidgetP->setAttribute(Qt::WA_DontShowOnScreen, false);
QtLetTimersFire(0);
#endif

#if 0
qWidgetP->setAttribute(Qt::WA_DontShowOnScreen, true);
qWidgetP->show();

qWidgetP->layout()->invalidate();
qWidgetP->layout()->update();
qWidgetP->layout()->activate();

for (auto* childP: qWidgetP->findChildren<QWidget*>()) {
childP->updateGeometry();
}

qWidgetP->updateGeometry();

qWidgetP->hide();
qWidgetP->setAttribute(Qt::WA_DontShowOnScreen, false);
QtLetTimersFire(0);
#endif


On May 24, 2024, at 12:47 AM, coroberti <coroberti at gmail.com<mailto:coroberti at gmail.com>> wrote:

David,
Try
yourWidget->layout()->update();
yourWidget->layout()->activate();

If not,
let the event loop to run, ie. arranging a short timer.

Kind regards,
Robert Iakobashvili
............................

On Fri, May 24, 2024 at 1:53 AM David M. Cotter <dave at kjams.com<mailto: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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