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Class jcsp.awt.ActivePanel

java.lang.Object
   |
   +----java.awt.Component
           |
           +----java.awt.Container
                   |
                   +----java.awt.Panel
                           |
                           +----jcsp.awt.ActivePanel

public class ActivePanel
extends Panel
implements CSProcess

Process Diagram

  ______________
 |              |
 |  ActivePanel |
 |______________|

Description

An ActivePanel is a sub class of Panel 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 Panel 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 ContainerExample extends Frame {
   public ContainerExample() {
     super("Container Example");
     final Channel event = new One2OneChannel();
     final Channel id = new One2OneChannel();
     ActiveContainer c = new ActiveContainer();
     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 ContainerExample();
   }
 }

Author:: P.D.Austin

par: The Parallel construct containing the processes to be executed by this CSProcess.

ActivePanel(): Constructs a new ActivePanel.

addComponentEventChannel(ChannelOutput): Add a new Channel to the Component which will be used to notify that a ComponentEvent has occurred on the component.
addContainerEventChannel(ChannelOutput): Add a new Channel to the Container which will be used to notify that a ContainerEvent has occurred on the Container.
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.

par

 protected Parallel par

The Parallel construct containing the processes to be executed by this CSProcess.

ActivePanel

 public ActivePanel()

Constructs a new ActivePanel.

addContainerEventChannel

 public void addContainerEventChannel(ChannelOutput containerEvent)

Add a new Channel to the Container which will be used to notify that a ContainerEvent has occurred on the Container. This should be used instead of registering a ContainerListener with the Container. 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 ContainerEventHanlder will be generated for the Channel so that each Channel operates independently of the others.