Widget setVisible(false) without layout changing ?

[Andy314]

Is it possible make a widget invisible (not drawn), so that the layout manager preserves the same space as before for it ?

[SGaist]

Hi,

I'm not sure I'm following correctly, what would you like to achieve ?

[p3c0]

@Andy314 I guess you will need to insert an empty QWidget or a QSpacerItem.

[SGaist]

After getting some sleep… You could use a QStackedWidget/Layout with an empty widget in. When you want to "hide" your main widget, just change the current widget of the stack.

[Andy314]

Sometimes it is more logical to hide a widget instead of disabling it.
(Button funktion makes in the current state no sense - a info text is not needed, etc.)
But I want avoid the resizing/moving of the other widgets, so that the dialog stays stable.
(Widget keeps the same sizeHint but draw itself as invisible.)
I tested:
The trick with the empy widget and an invisible widget in it works very well.
QStackedWidget must work too.

Is there a special page, where some common tricks for the Qt GUI designing are explained ?

[SGaist]

Not that I know of but the wiki is pretty big (and currently in a cleanup phase)

[CP71]

@Andy314
Hi
Sorry if I use this post for an updating,
I want to do same thing in Qt 4.X and I have found this post:

https://stackoverflow.com/questions/1874426/hiding-qt-widget-and-keeping-widget-space

The tip is using QsizePolicy, for example:

QSizePolicy sp_retain = ui->label_3->sizePolicy();
sp_retain.setRetainSizeWhenHidden(true);
ui->label_3->setSizePolicy(sp_retain);
ui→label_3→hide();

Unfortunately is not possible to use in Qt 4 but only in Qt5 :(

Regards