Bug 174844 [JFace] JFace ToolTip class should support manual activation
I have been using the new JFace ToolTip class for showing custom-draw tool tips for my tree items and works very nicely for that. Now I have another context that I need to use tool tips in. In this context, the tool tips need to be activated in response to an event other than mouse movement. To be specific, I want to popup a tool tip when user attempts to uncheck a tree item that shouldn't be unchecked. After the tool tip is displayed, I want standard tooltip behavior (times out, hides on mouse movement, etc.). It doesn't look like I can do that using the ToolTip class. Perhaps a base class can be pulled out from the ToolTip class. The base class would expose a protected show method and let a subclass take care of activation. The existing ToolTip class can then add activation based on mouse movement + delay. Other subclasses can then be made that implement alternative activation methods.
bundles/org.eclipse.jface/src/org/eclipse/jface/window/DefaultToolTip.java
* 
	 * @param backgroundImage
	 *            the {@link Image} or <code>null</code> if no image should be
	 *            displayed in the background
	 */
	public void setBackgroundImage(Image backgroundImage) {
		this.backgroundImage = backgroundImage;
	}
	/**
	 * The {@link Font} used by {@link CLabel} in the default implementation
	 * 
	 * @param font
	 *            the {@link Font} or <code>null</code> if the default font
	 *            should be used
	 */
	public void setFont(Font font) {
		this.font = font;
	}
	/**
	 * The foreground {@link Color} used by {@link CLabel} in the default
	 * implementation
	 * 
	 * @param foregroundColor
	 *            the {@link Color} or <code>null</code> if default foreground
	 *            color should be used
	 */
	public void setForegroundColor(Color foregroundColor) {
		this.foregroundColor = foregroundColor;
	}
	/**