Bug 163274 [JFace] Provide customizable ToolTip at JFace level
More and more elements in JFace and UI request Customizable TooltipSupport. We should think about providing a common class providing a solid base for Tooltip implementations.
bundles/org.eclipse.jface/src/org/eclipse/jface/viewers/ToolTipSupport.java
private ColumnViewer viewer;
	private Listener listener = new MouseListener();
	private static final int DEFAULT_SHIFT_X = 10;
	private static final int DEFAULT_SHIFT_Y = 0;
	
	ToolTipSupport(ColumnViewer viewer) {
		this.viewer = viewer;
	}
	
	/**
	 * activate tooltip support for this viewer
	 */
	public void activate() {
		deactivate();
		viewer.getControl().addListener(SWT.Dispose, listener);
		viewer.getControl().addListener(SWT.MouseHover, listener);
		viewer.getControl().addListener(SWT.MouseMove, listener);
		viewer.getControl().addListener(SWT.MouseExit, listener);
		viewer.getControl().addListener(SWT.MouseDown, listener);
	}
	
	/**
	 * deactivate tooltip support for this viewer
	 */
	public void deactivate() {
		viewer.getControl().removeListener(SWT.Dispose, listener);
		viewer.getControl().removeListener(SWT.MouseHover, listener);