Examples of org.eclipse.swt.widgets.Control.removeKeyListener()

org.eclipse.swt.widgets.Control.removeKeyListener()
Removes the listener from the collection of listeners who will be notified when keys are pressed and released on the system keyboard. @param listener the listener which should no longer be notified @exception IllegalArgumentException
- ERROR_NULL_ARGUMENT - if the listener is null
@exception SWTException
- ERROR_WIDGET_DISPOSED - if the receiver has been disposed
- ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
@see KeyListener @see #addKeyListener

        if (active) {
            Control control = getContext().getViewportPane().getControl();
            control.addKeyListener(this);
        }else{
            Control control = getContext().getViewportPane().getControl();
            control.removeKeyListener(this);
        }
        
    }
    
    private double distance() throws TransformException {

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