All Packages  Class Hierarchy  This Package  Previous  Next  Index

Class jcsp.awt.ActiveComponent

java.lang.Object
   |
   +----java.awt.Component
           |
           +----jcsp.awt.ActiveComponent

public class ActiveComponent
extends Component

Process Diagram

  __________________
 |                  |
 |  ActiveComponent |
 |__________________|

Description

An ActiveComponent is a sub class of Component which uses Channels for event notification.

It is possible to register Channels to be used to notify the occurrence of other types of Event that the Component generates. This can be done by calling one of the addXXXXEventChannel() methods.

Channel Protocols

Input Channels

Output Channels

Example

 import java.awt.*;
 import jcsp.lang.*;
 import jcsp.awt.*;
 public class ComponentExample extends Frame {
   public ComponentExample() {
     super("Component Example");
     final Channel event = new One2OneChannel();
     final Channel id = new One2OneChannel();
     ActiveComponent c = new ActiveComponent();
     c.addMouseEventChannel(event);
     add(c);
     setVisible(true);
     new Parallel(new CSProcess[] {
       c,
       new EventIDFilter(event, id),
       new CSProcess() {
         public void run() {
           Integer i = (Integer)id.read();
           if (i.intValue() == MouseEvent.MOUSE_CLICKED) {
             setVisible(false);
             System.exit(0);
           }
         }
       }
     }).run();
   }
   public static void main(String argv[]) {
     new ComponentExample();
   }
 }

Author:: P.D.Austin

ActiveComponent(): Constructs a new Component.

addComponentEventChannel(ChannelOutput): Add a new Channel to the Component which will be used to notify that a ComponentEvent has occurred on the component.
addFocusEventChannel(ChannelOutput): Add a new Channel to the Component which will be used to notify that a FocusEvent has occurred on the component.
addKeyEventChannel(ChannelOutput): Add a new Channel to the Component which will be used to notify that a KeyEvent has occurred on the component.
addMouseEventChannel(ChannelOutput): Add a new Channel to the Component which will be used to notify that a MouseEvent has occurred on the component.
addMouseMotionEventChannel(ChannelOutput): Add a new Channel to the Component which will be used to notify that a MouseMotionEvent has occurred on the component.
run(): The main body of this process.

ActiveComponent

 public ActiveComponent()

Constructs a new Component.

addComponentEventChannel

 public void addComponentEventChannel(ChannelOutput componentEvent)

Add a new Channel to the Component which will be used to notify that a ComponentEvent has occurred on the component. This should be used instead of registering a ComponentListener with the component. It is possible to add more than one Channel by calling this method multiple times If the reference passed is null no action will be taken. Otherwise a new ComponentEventHanlder will be generated for the Channel so that each Channel operates independently of the others.