[Chapter 20] 20.25 java.awt.event.PaintEvent (JDK 1.1)

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| Chapter 20 The java.awt.event Package |

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

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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);
    }

### Hierarchy:

`Object->EventObject(Serializable)->AWTEvent->ComponentEvent->PaintEvent`

java.awt.event.MouseMotionListener (JDK 1.1) |  | java.awt.event.TextEvent (JDK 1.1)