Mega Code Archive
An example of getting the Accessible information from a Button object
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/*
Java Swing, 2nd Edition
By Marc Loy, Robert Eckstein, Dave Wood, James Elliott, Brian Cole
ISBN: 0-596-00408-7
Publisher: O'Reilly
*/
// ActionExampleButton.java
//An example of getting the Accessible information from a Button object.
//(You could see this information by attaching an AssistiveExample object
//to the button. See BigExample.java for an example of that attachment.)
//
import java.awt.BorderLayout;
import java.awt.Button;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.Locale;
import javax.accessibility.Accessible;
import javax.accessibility.AccessibleAction;
import javax.accessibility.AccessibleContext;
import javax.accessibility.AccessibleRole;
import javax.accessibility.AccessibleStateSet;
import javax.swing.JFrame;
import javax.swing.SwingUtilities;
public class ActionExample extends Button implements ActionListener, Accessible {
public ActionExample() {
super("Press this Button");
addActionListener(this);
}
public AccessibleContext getAccessibleContext() {
return (new ActionAccessibleContext());
}
public void actionPerformed(ActionEvent e) {
System.out.println("The button was pressed!");
}
public void processActionEvent(ActionEvent e) {
super.processActionEvent(e);
}
// This class contains the accessible context for the component. Many
// abstract methods simply call the SwingUtilities class to get the job
// done; this is advised if you can get away with it. Otherwise, see the
// source code for SwingUtilities.
class ActionAccessibleContext extends AccessibleContext {
public ActionAccessibleContext() {
super();
setAccessibleName("Button");
setAccessibleDescription("Press the Button");
}
public AccessibleRole getAccessibleRole() {
// Fill in whatever role you want here
return (AccessibleRole.AWT_COMPONENT);
}
public AccessibleStateSet getAccessibleStateSet() {
return SwingUtilities.getAccessibleStateSet(ActionExample.this);
}
public int getAccessibleIndexInParent() {
return SwingUtilities
.getAccessibleIndexInParent(ActionExample.this);
}
public int getAccessibleChildrenCount() {
return SwingUtilities
.getAccessibleChildrenCount(ActionExample.this);
}
public Accessible getAccessibleChild(int i) {
return SwingUtilities.getAccessibleChild(ActionExample.this, i);
}
public Locale getLocale() {
// Ask the component what its locale is
return ActionExample.this.getLocale();
}
public AccessibleAction getAccessibleAction() {
return new AccessAction();
}
}
// This class implements the AccessibleAction interface. Essentially, there
// is only one action that is the equivalent of pushing the button.
class AccessAction implements AccessibleAction {
final int NUMBER_OF_ACTIONS = 1;
final String DESCRIPTION = "Presses the button";
public int getAccessibleActionCount() {
return NUMBER_OF_ACTIONS;
}
public String getAccessibleActionDescription(int i) {
if (i == 0)
return (DESCRIPTION);
else
return null;
}
public boolean doAccessibleAction(int i) {
if (i == 0) {
// Simulate pressing a button
ActionExample.this.processActionEvent(new ActionEvent(this,
ActionEvent.ACTION_PERFORMED, ActionExample.this
.getActionCommand()));
return true;
} else
return false;
}
}
public static void main(String s[]) {
ActionExample example = new ActionExample();
JFrame frame = new JFrame("AccessibleAction Example");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.getContentPane().add(example, BorderLayout.CENTER);
frame.setSize(100, 100);
frame.setVisible(true);
}
}
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