Event Objects
- When you receive an event either in handleEvent() or in another event method, the event you receive is described by an Event object defined in (java.awt.Event).
- An event object contains a number of public variables that describe the event. For example, the most often used is event.target, which is the originator of the event. Thus, if a button is pressed and an action event is posted, the target field will equal the button that generated the event.
- The following table outlines some of the other properties
| Value | Description |
|---|---|
| Object target | The object receiving the event. |
| long when | Event time stamp. |
| int id | The type of the event. |
| int x | The x coordinate of the event. |
| int y | The y coordinate of the event. |
| int key | The key that was pressed, if any. |
| int modifiers | The state of the modifier keys, if any. |
| int clickCount | The number of consecutive mouse clicks, if any. |
| Object arg | An arbitrary argument. |
- You can easily use any of this information in your event handling logic in order to perform tests, debugging or anything else.
Additional Resources:
- Learning to Write Java
- Introducing Java (TM) - Your First Applet
- Java FAQs
- Java Software
- java.sun.com
- Sun Microsystems
Event
Propagation
Table of Contents
Event Modifiers
