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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 use KDE classes like KMessageBox, you need to tell qtcreator to use the KDE libraries when building. Go to your home directory, cd into yourproject and modify yourproject.pro. Add a line
LIBS += -lkdeui
Then you can start using KDE classes in your code.
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 integrate existing 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 should work analog.
File -> Open -> kdepim/CMakeLists.txt.
. -DCMAKE_INSTALL_PREFIX=/usr/local -DLIB_SUFFIX=64 -DCMAKE_BUILD_TYPE=debugfull
DLIB_SUFFIX=64 means that you want to install your libraries into directories named lib64.
Projects -> Active run configuration=ktimetracker -> build settings -> build steps -> make -> show details -> activate ktimetracker.