a way to reset the layout?

[qtpi]

hi folks. I am thinking about how I can reset the layout for my program. The possible solutions are: QStackedWidget/QStackedLayout or delete the layout and re-create new layout.

But my question is: is there any way to just demount all the widgets and sublayouts from the main layout without deleting them? So in this case I do not need to re-initialize all the widgets and sublayouts.

[SGaist]

Hi,

Out of curiosity, why do you need that for ?

[qtpi]

@SGaist hi, I'm trying to make a changeable window layout. If the button is pressed the window layout will change from one form to another.

I thought QStackedLayout is not good cause I have to create multiple instances for the windows then stack them together. My priority is the efficiency so this seems not very beneficial for me.

I tried to delete the layout and re-create the layout. It worked, but the program seems so unstable. It will crash with no reason.

[alex_malyu]

Combination of:
void QLayout::removeItem(QLayoutItem *item)
void QLayout::removeWidget(QWidget *widget)

or if you only need widgets:
QLayoutItem *QLayout::replaceWidget(QWidget *from, QWidget *to, Qt::FindChildOptions options = Qt::FindChildrenRecursively)

Even though I did not see a single case when such approach would provide any advantage it probably may exist.

[qtpi]

@alex_malyu hi, thnx for the reply. The thing is every instance has a lots of update functions in it. If I create one more instance and just hide it using QStackedLayout, the update functions will still be called in background and it's not friendly for the RAM.

maybe there's a way to re-write it so the update functions will only be called when the parents Widget is shown.

[alex_malyu]

@qtpi
look at QWidget::setUpdatesEnabled(
call it on widget parent of layout you change, make changes, re-enable

setUpdatesEnabled(false);
bigVisualChanges();
setUpdatesEnabled(true);

[qtpi]

@alex_malyu they look very interesting, I'm gonna do some research. Thanks for the help!