MouseEventsInViews

MouseEventsInViews is a sample that is essentially the same as KeyEventsInViews, except that it uses mouse-button up and down events. It illustrates how to query the mouse button state and get the event location in global coordinates.

Running the sample

Execute MouseInputInViewsSApp. Click any mouse button in one of the views. The view reports the location of the mouse click.

Files and classes

TMouseInputView is defined in MouseInputView.h and MouseInputView.C. It derives from TContentView, which derives from MEventTarget, so does not have to mix this in directly. It also mixes in MMouseEventHandler, so that it can receive mouse events. It overrides MouseButtonDown and MouseButtonUp to record the button number, change (down or up), and location in global coordinates of the event, and displays this information in its DrawContents member function.

Notes

The MEventTarget must be registered with a TStandardEventReceiver. Fortunately, the view system provides one for you to use. This sample view connects to the event receiver in HandleAfterAddedToViewRoot, and disconnects from it in HandleBeforeRemovedFromViewRoot.

Clicking the mouse outside the view hierarchy causes the event receiver associated with our views to surrender the input focus, and thus stop receiving events. So if you click down outside the window containing a view, move the mouse to the view, and release the mouse there, the view doesn't receive the event. Notice that clicking in a view within the same window works as expected.

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