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Java in a Nutshell

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The java.awt.event Package

20.25 java.awt.event.PaintEvent (JDK 1.1)

An event of this type indicates that a component should have its update() method invoked. (The update() method typically, by default, invokes the paint() method.)

PaintEvent differs from the other event types in java.awt.event in that it does not have a corresponding EventListener interface. PaintEvent is essentially for internal use by the AWT redisplay framework, so your programs should not try to handle it the way they handle other events. Instead, applets and custom components should simply override their paint() and/or update() methods to redraw themselves appropriately. AWT automatically invokes update() (which typically invokes paint()) when a PaintEvent arrives.

Although you do not typically use the PaintEvent, redraw events are implemented through this class for simplicity, so that they are on equal footing with other event types, and so that advanced programs can manipulate them through the EventQueue.

public class PaintEvent extends ComponentEvent {
    // Public Constructor
            public PaintEvent(Component source, int id, Rectangle updateRect);
    // Constants
            public static final int PAINT;
            public static final int PAINT_FIRST;
            public static final int PAINT_LAST;
            public static final int UPDATE;
    // Public Instance Methods
            public Rectangle getUpdateRect();
            public String paramString();  // Overrides ComponentEvent
            public void setUpdateRect(Rectangle updateRect);



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