[Interest] Update widget geometry BEFORE window shown

[Tony Rietwyk]

Hi Dave,

I have had a similar issue at various times, especially in Qt4, but not 
as much in Qt5 & 6.  A few places still had problems when adjusting 
after creating or deleting widgets, or switching pages in an embedded 
page control.  This is the routine I use:

void activateLayoutsRecursive(QWidget *w)
{
     if (w)
     {
         // Depth first traversal.
         for (auto k : w->children())
         {
             if (auto z = qobject_cast<QWidget *>(k))
                 activateLayoutsRecursive( z );
         }

         if (w->layout())
         {
             w->layout()->invalidate();
             w->layout()->activate();
             //qCDebug(lc) << w->objectName() << 
w->layout()->totalMinimumSize();
         }
     }
}

I hope that helps!

Tony

On 27/05/2024 4:01 pm, David M. Cotter 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> 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
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