how to create & call slot in other class than MainWindow?

Currently Im using QT Creator which created UI file for view and I'm a QT starter.

There is a part I am curious is that how can i create another Class for, let say a GraphicView, so that I can send signal and slot to that class instead of the main form?

Side Question: why I can't edit Singal and Slot in other place than MainWindow i开发者_JS百科n Edit Signal/Slot Mode? (the edit button is not activated if it's not MainWindow, so i have to use those default Signal) Let say i need to create a ToggleFullScreen() but the edit is gray out, how do I do it?

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Adam is right.
But there are several ways to use a UI file in your application.
Have a look at http://qt.nokia.com/doc/4.5/designer-using-a-ui-file.html

For signal-slot specific question : see the link in Adam answer.
But, in summary, if you declare the Q_OBJECT macro in yours classes, you can communicate between those by signal-slot mechanism !

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1. Signals and Slots
2. You have to create a derived class that inherits from QMainWindow if you want to add new signals or slots.