AssistiveExamplepublic class AssistiveExample extends JPanel implements ActionListener, GUIInitializedListener, MouseMotionListener
| Fields Summary |
|---|
| Timer | timer | | static JFrame | frame | | JLabel | nameLabel | | JLabel | descriptionLabel | | JLabel | tableLabel | | JCheckBox | selectionCheckBox | | JCheckBox | textCheckBox | | JCheckBox | valueCheckBox | | JCheckBox | componentCheckBox | | JCheckBox | actionCheckBox | | JCheckBox | hypertextCheckBox | | JCheckBox | iconCheckBox | | JCheckBox | tableCheckBox | | JCheckBox | editableTextCheckBox | | JLabel | classLabel | | JLabel | parentLabel | | JLabel | relationLabel | | JButton | performAction |
| Constructors Summary |
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public AssistiveExample()
frame = new JFrame("Assistive Example");
// Insert the appropriate labels and check boxes
setLayout(new GridLayout(0,1)); // just make as many rows as we need
add(nameLabel);
add(descriptionLabel);
add(tableLabel);
add(new JSeparator());
add(actionCheckBox);
add(componentCheckBox);
add(editableTextCheckBox);
add(hypertextCheckBox);
add(iconCheckBox);
add(selectionCheckBox);
add(tableCheckBox);
add(textCheckBox);
add(valueCheckBox);
add(classLabel);
add(parentLabel);
add(relationLabel);
add(performAction);
setBorder(new TitledBorder("Accessible Component"));
performAction.addActionListener(this);
frame.getContentPane().add(this, BorderLayout.CENTER);
frame.setBounds(100,100,500,600);
frame.setVisible(true);
// Check to see if the GUI subsystem is initialized
// correctly. (This is needed in JDK 1.2 and higher).
// If it isn't ready, then we have to wait.
if (EventQueueMonitor.isGUIInitialized()) {
createGUI();
} else {
EventQueueMonitor.addGUIInitializedListener(this);
}
performAction.grabFocus();
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| Methods Summary |
|---|
| public void | actionPerformed(java.awt.event.ActionEvent e)
//Find the component currently under the mouse.
Point currentPosition = EventQueueMonitor.getCurrentMousePosition();
Accessible comp = EventQueueMonitor.getAccessibleAt(currentPosition);
//If the user pressed the button, and the component
//has an accessible action, then execute it.
if (e.getActionCommand() == "Perform Action") {
AccessibleContext context = comp.getAccessibleContext();
AccessibleAction action = context.getAccessibleAction();
if (action != null)
action.doAccessibleAction(0);
else
System.out.println("No accessible action present!");
return;
}
// Otherwise, the timer has fired. Stop it and update the window.
timer.stop();
updateWindow(comp);
| | public void | createGUI()
// We want to track the mouse motions, so notify the
// Swing event monitor of this.
SwingEventMonitor.addMouseMotionListener(this);
// Start a Timer object to measure how long the mouse stays
// over a particular area.
timer = new Timer(500, this);
| | public void | guiInitialized()
createGUI();
| | public void | mouseDragged(java.awt.event.MouseEvent e)
// If the mouse is dragged, restart the timer.
timer.restart();
| | public void | mouseMoved(java.awt.event.MouseEvent e)
// If the mouse moves, restart the timer.
timer.restart();
| | private void | updateWindow(javax.accessibility.Accessible component)
if (component == null) { return; }
// Reset the check boxes
actionCheckBox.setSelected(false);
selectionCheckBox.setSelected(false);
textCheckBox.setSelected(false);
componentCheckBox.setSelected(false);
valueCheckBox.setSelected(false);
hypertextCheckBox.setSelected(false);
iconCheckBox.setSelected(false);
tableCheckBox.setSelected(false);
editableTextCheckBox.setSelected(false);
// Get the accessibile context of the component in question
AccessibleContext context = component.getAccessibleContext();
AccessibleRelationSet ars = context.getAccessibleRelationSet();
nameLabel.setText("Name: " + context.getAccessibleName());
descriptionLabel.setText("Desc: " + context.getAccessibleDescription());
relationLabel.setText("Relation: " + ars);
// Check the context for each of the accessibility types
if (context.getAccessibleAction() != null)
actionCheckBox.setSelected(true);
if (context.getAccessibleSelection() != null)
selectionCheckBox.setSelected(true);
if (context.getAccessibleText() != null) {
textCheckBox.setSelected(true);
if (context.getAccessibleText() instanceof AccessibleHypertext)
hypertextCheckBox.setSelected(true);
}
if (context.getAccessibleComponent() != null) {
componentCheckBox.setSelected(true);
classLabel.setText("Class: " + context.getAccessibleComponent());
parentLabel.setText("Parent: " + context.getAccessibleParent());
}
if (context.getAccessibleValue() != null)
valueCheckBox.setSelected(true);
if (context.getAccessibleIcon() != null)
iconCheckBox.setSelected(true);
if ((context.getAccessibleTable() != null) ||
(context.getAccessibleParent() instanceof JTable)) {
tableCheckBox.setSelected(true);
tableLabel.setText("Table Desc: " +
context.getAccessibleParent().getAccessibleContext()
.getAccessibleDescription());
}
else {
tableLabel.setText("");
}
// On 1.4+ systems, you can check for editable text with these two lines.
// Note that because of the 1.4 restriction, these lines will not compile
// on a Mac system as of the time of this writing. You can comment out
// these lines and still compile/run the example, though.
//if (context.getAccessibleEditableText() != null)
// editableTextCheckBox.setSelected(true);
repaint();
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