How to make a Qt Widget grow with the window size

Question

I want to have a small QFormLayout that grows to fill its parent widget   I created a new  ui file using the QWidget template in Qt Designer  I put a QFormLayout inside that  window   then put some controls inside that QFormLayout   This all works reasonably well  but the QFormLayout always stays at the size I set in Qt Designer  I would like the QFormLayout to fill its parent widget and grow shrink with it   How can I accomplish that

User · Answer

The accepted answer  its image  is wrong  at least now in QT5  Instead you should assign a layout to the root object widget  pointing to the aforementioned image  it should be the MainWindow instead of centralWidget   Also note that you must have at least one QObject created beneath it for this to work  Do this and your ui will become responsive to window resizing

User · Answer

In Designer  activate the centralWidget and assign a layout  e g  horizontal or vertical layout  Then your QFormLayout will automatically resize   Always make sure  that all widgets have a layout  Otherwise  automatic resizing will break with that widget  See also  Controls insist on being too large  and won t resize  in QtDesigner

User · Answer

I found it was impossible to assign a layout to the centralwidget until I had added at least one child beneath it   Then I could highlight the tiny icon with the red  disabled  mark and then click on a layout in the Designer toolbar at top

User · Answer

You need to change the default layout type of top level QWidget object from Break layout type to other layout types  Vertical Layout  Horizontal Layout  Grid Layout  Form Layout   For example    To something like this

[qt4] How to make a Qt Widget grow with the window size?

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