Java Reference
In-Depth Information
Example 14−9: YesNoPanelCustomizer.java (continued)
// And a big text area below it for entering the message.
message = new TextArea(bean.getMessageText());
message.addTextListener(this);
// TextAreas don't know how big they want to be. You must tell them.
message.setSize(400, 200);
this.add(message, "Center");
// Then add a row of textfields for entering the button labels.
Panel buttonbox = new Panel(); // The row container
buttonbox.setLayout(new GridLayout(1, 0, 25, 10)); // Equally spaced
this.add(buttonbox, "South");
// Put row on bottom
// Now go create three TextFields to put in this row. But actually
// position a Label above each, so create an container for each
// TextField+Label combination.
fields = new TextField[3]; // Array of TextFields.
String[] labels = new String[] { // Labels for each.
"Yes Button Label", "No Button Label", "Cancel Button Label"};
String[] values = new String[] { // Initial values of each.
bean.getYesLabel(), bean.getNoLabel(), bean.getCancelLabel()};
for(int i = 0; i < 3; i++) {
Panel p = new Panel(); // Create a container.
p.setLayout(new BorderLayout()); // Give it a BorderLayout.
p.add(new Label(labels[i]), "North"); // Put a label on the top.
fields[i] = new TextField(values[i]); // Create the text field.
p.add(fields[i], "Center");
// Put it below the label.
fields[i].addTextListener(this);
// Set the event listener.
buttonbox.add(p);
// Add container to row.
}
}
// Add some space around the outside of the panel.
public Insets getInsets() { return new Insets(10, 10, 10, 10); }
// This is the method defined by the TextListener interface. Whenever the
// user types a character in the TextArea or TextFields, this will get
// called. It updates the appropriate property of the bean and fires a
// property changed event, as all customizers are required to do.
// Note that we are not required to fire an event for every keystroke.
// Instead we could include an "Apply" button that would make all the
// changes at once, with a single property changed event.
public void textValueChanged(TextEvent e) {
TextComponent t = (TextComponent)e.getSource();
String s = t.getText();
if (t == message) bean.setMessageText(s);
else if (t == fields[0]) bean.setYesLabel(s);
else if (t == fields[1]) bean.setNoLabel(s);
else if (t == fields[2]) bean.setCancelLabel(s);
listeners.firePropertyChange(null, null, null);
}
// This code uses the PropertyChangeSupport class to maintain a list of
// listeners interested in the edits we make to the bean.
protected PropertyChangeSupport listeners =new PropertyChangeSupport(this);
public void addPropertyChangeListener(PropertyChangeListener l) {
listeners.addPropertyChangeListener(l);
}
public void removePropertyChangeListener(PropertyChangeListener l) {
listeners.removePropertyChangeListener(l);
