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Custom Events
in Java


Prof. David Bernstein
James Madison University

Computer Science Department
bernstdh@jmu.edu

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Overview
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  • An Observation:
    • We sometimes want to add "custom" events to a graphical user interface
  • One Approach:
    • Add functionality to an existing component so that it responds to a "normal" event and generates a "custome" event
The Basics
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  • AWT:
    • Use the AWTEventMulticaster java.awt.AWTEventMulticaster class
  • Swing:
    • Use the EventListenerList javax.swing.event.EventListenerList class
An Example
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  • A ColorButton that can be used to select a Color
  • A ColorEvent that can be used to inform objects of Color changes
  • A ColorListener interface
An Example (cont.)
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ColorEvent

javaexamples/gui/ColorEvent.java
 
An Example (cont.)
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ColorListener

javaexamples/gui/ColorListener.java
 
An Example (cont.)
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ColorButton

javaexamples/gui/ColorButton.java
 
An Example (cont.)
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An Application

javaexamples/gui/ColorButtonDriver.java
 
There's Always More to Learn
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