All Packages  Class Hierarchy  This Package  Previous  Next  Index

Class test.jcsp.ScrollbarTest

java.lang.Object
   |
   +----java.awt.Component
           |
           +----java.awt.Container
                   |
                   +----java.awt.Panel
                           |
                           +----java.applet.Applet
                                   |
                                   +----jcsp.awt.ActiveApplet
                                           |
                                           +----test.jcsp.ScrollbarTest

public class ScrollbarTest

extends ActiveApplet

implements ItemListener

Applet

Process Diagram

External View

  _________________
 |                 |
 |  ScrollbarTest  |
 |_________________|
 

Internal View

  _____________________________________
 |  ___________________                |
 | |                   |               |
 | | Java Event Thread |               |
 | |___________________|               |
 |         |                           |
 |         v configure                 |
 |  _______|_________         _______  |
 | |                 | event |       | |
 | | ActiveScrollbar |--->---|       | |
 | |_________________|       |_______| |
 |                                     |
 |                       ScrollbarTest |
 |_____________________________________|
 

Description

The anonymous process has an infinite loop which reads one object from the event Channel and upon receiving the Object displays the value on a Label.

NOTE: The Java Event thread is a process which is created by the Java runtime environment and calls the itemStateChanged method when one of the components the Applet is listening to generates an ItemEvent.

The purpose of this test is to check to see if the events are notified correctly and that the configuration functions correctly.

NOTE: The code for this Applet is not a good example of developing programs using the library, it has been designed to allow the component to be tested without depending on more classes from the library than is necessary.

Author:

P.D.Austin

ScrollbarTest()

getAppletInfo()

return the name of the applet and author.

init()

Initialise the applet.

itemStateChanged(ItemEvent)

Handles ItemEvents generated by components this class is listening to.

 public ScrollbarTest()

 public void init()

Initialise the applet.

Overrides:

init in class Applet

 public void itemStateChanged(ItemEvent e)

Handles ItemEvents generated by components this class is listening to.

Parameters:

e - The ItemEvent to be processed

 public String getAppletInfo()

return the name of the applet and author.

Overrides:

getAppletInfo in class Applet

All Packages  Class Hierarchy  This Package  Previous  Next  Index