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QtCreator is an IDE from Nokia for Qt. It contains QtDesigner for UI design.
Qt Designer is a graphical program which allows you to easily build user interfaces, using a drag n drop interface. Here is a short example how it can go, for more information read the user documentation.
Add the widgets you want by drag-and-drop
Select the mainwindow. This is the one un-intuitive step. To lay out the objects in the mainwindow, you do not select the objects in the mainwindow, but the mainwindow itself.
Select Form -> Lay Out in a Grid
You get a decent look, and if you resize the window, the widgets resize as well.
To add a toolbar, right-click on the UI and choose "Add Toolbar". Then you can set icons and text in your mainwindow's constructor with code like this:
This describes how to use QtCreator to develop KDE 4 applications. It has been tested with QtCreator 1.2.80 and SUSE Linux 11.1 but should work same or similar with every combination. As an example KDE application we use ktimetracker from the kdepim module, other applications short work analog.
File -> Open -> kdepim/CMakeLists.txt.
Projects -> ktimetracker -> build settings -> Add a configuration ktimetracker.
As build directory choose /home/youruser/kdepim/ktimetracker. As arguments for cmake use ...