Why can't I set a layout for a page in a QStackedWidget in Qt Designer?

Question

Steps to reproduce in Designer for Qt 4.8.0:

• I create a new dialog form in Qt Designer
• I add a QStackedWidget to the dialog
• I set the layout of the dialog to make the stacked layout size with the dialog
• I add a few controls to page one in the stacked widget
• I select the first page in the stacked widget in the right hand tree view of controls
• The icon next to that page (which is a QWidget) shows the page is missing a layout

When I click one of the layout buttons above, it doesn't change the layout of the page QWidget; it changes the layout of the dialog, even though I had explicitly selected the page.

Is this a bug in Qt Designer? Am I missing something? I really don't want to add the layouts programatically, as that prevents me from being able to layout the pages in Qt Designer in the same .ui file

Answer 1

Clicking a widget page in the object tree brings that page to the top of the stack, but it does not select it.

In fact, it is not possible to select a widget page itself - only its child widgets can be selected (as well as, of course, the parent stacked-widget).

The easiest way to set a layout for a widget page is to:

1. bring it to the top by clicking the little arrows on the top-right corner of its parent stacked-widget
2. set the appropriate layout using the buttons on the toolbar

Note that it is not possible to set a layout on a widget that does not have any child widgets.

(If there is a bug here, it is that the toolbar buttons should really be greyed-out when clicking on a widget page in the object tree that has no child widgets. When the stacked-widget arrows are used, the toolbar buttons are greyed-out correctly).