I have developed a couple of Qt based GUI applications with customized bitmap background and bitmap widgets within fixed size windows or widgets. Now I am starting to develop a new GUI application with all bitmap based custom widgets within sizable windows or widgets in order to support various screen resolutions. That means that I have to resize the background image and customized icon buttons accordingly. I don't have a good sulotion at all on this new project and still researching and experimenting. If someone has already done this kind of project or has any good idea about how to design and implement for this kind of project, you could save me or other developers lots of development time.