How to auto-resize qt widget?

Question

QT Version: 4.5.2 OS: ubuntu 8.04 I have a trouble with auto-resizing widget, here is an example: alt text http://img15.imageshack.us/img15/3479/autoresize.png As the figure shows, here are two widgets, one is a "StrWidget"(the upper widget in the figure 1) which has 5 QLabels for showing strings, the other is a "CtrlWidget" which tells StrWidget what string to show. When I click "send CCC", the StrWidget becomes the widget shown in figure 2 But when I click "send A" again, the StrWidget becomes the widget shown in figure 3 There is a member function StrWidget::changeString which is a slot of StrWidget and receive the string for showing. ``` void StrWidget::changeString(QString inputStr) { for(int i=0;i<5;i++){ strEntries[i]->setText(inputStr); } } ``` the StrWidget cannot auto-resize itself when changeString is called. I try the following two methods: (1) Insert "adjustSize()" in StrWidget::changeString, it works but I need to click a button twice to make it resized. I don't know why…

Accepted Answer

You could try

```
mainLayout->activate();
```

in `changeString()`. That forces the layout to be redone. (You'll have to make `mainLayout` a class member though, or alternatively get the layout through `layout()`).

Also, try adding the controls with a stretch factor of zero:

```
mainLayout->addWidget(strEntries[i], 0);
```

How to auto-resize qt widget?

Solution

Problem