[Qt-interest] uic, QMainWindow and non QWidget central widgets

[Karol Krizka]

Hi all,

I am using Designer to design a QMainWindow that contains a non-QWidget 
central widget. I accomplished this by designing my layout and manually 
editing the generated .ui file and manually promoting the central widget. 
However, when I run the uic command, the central widget is not added using 
setCentralWidget.

For example, I have the following .ui file. Instead of promoting QWidget to a 
custom widget, I simplified it and replaced the central widget with a simple 
QFrame:

<ui version="4.0" >
 <class>MainWindow</class>
 <widget class="QMainWindow" name="MainWindow" >
  <property name="geometry" >
   <rect>
    <x>0</x>
    <y>0</y>
    <width>800</width>
    <height>600</height>
   </rect>
  </property>
  <property name="windowTitle" >
   <string>MainWindow</string>
  </property>
  <widget class="QFrame" name="centralwidget" />
  <widget class="QMenuBar" name="menubar" >
   <property name="geometry" >
    <rect>
     <x>0</x>
     <y>0</y>
     <width>800</width>
     <height>24</height>
    </rect>
   </property>
  </widget>
  <widget class="QStatusBar" name="statusbar" />
 </widget>
 <resources/>
 <connections/>
</ui>

Now, run the following command (along with the output):
kkrizka at tiny101 ~/test $ uic untitled.ui | grep -i setCentral
kkrizka at tiny101 ~/test $

If I change QFrame back to QWidget, I get the following:
kkrizka at tiny101 ~/test $ uic untitled.ui | grep -i setCentral
    MainWindow->setCentralWidget(centralwidget);
kkrizka at tiny101 ~/test $

Is this a problem with the uic command or some known limitation? 

Btw, it works quite well if I dynamically load the .ui file with QUiLoader.

Cheers,
Karol Krizka