Leadtools.WinForms Namespace > RasterImageViewer Class : OnSourceRectangleChanged Method |
'Usage Dim instance As RasterImageViewer Dim e As EventArgs instance.OnSourceRectangleChanged(e)
protected: virtual void OnSourceRectangleChanged( EventArgs^ e )
Raising an event invokes the event handler through a delegate.
The OnSourceRectangleChanged method also allows derived classes to handle the event without attaching a delegate. This is the preferred technique for handling the event in a derived class.
Notes to Inheritors: When overriding OnSourceRectangleChanged in a derived class, be sure to call the base class's OnSourceRectangleChanged method so that registered delegates receive the event.