Huge helper poster !
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There is, by chance, a huge poster that contain all class names with method signatures ? strange request !!
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If you use google, you could find the "class chart of Qt 4.3":http://doc.qt.nokia.com/extras/qt43-class-chart.pdf
There were even "other discussions about this on dev net":http://developer.qt.nokia.com/forums/viewthread/6865