Java Tutorial/Swing/AbstractButton
Содержание
AbstractButton: parent class for JButton
AbstractButton
|
+--JButton, JMenuItem, JToggleButton
AbstractButton Positioning
Position PropertyAvailable SettingshorizontalAlignmentLEFT, CENTER, RIGHThorizontalTextPositionLEFT, CENTER, RIGHTverticalAlignmentTOP, CENTER, BOTTOMverticalTextPositionTOP, CENTER, BOTTOM
Adding PropertyChangeListener to AbstractButton
import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;
import javax.swing.AbstractButton;
import javax.swing.Icon;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JFrame;
class AbstractButtonPropertyChangeListener implements PropertyChangeListener {
public void propertyChange(PropertyChangeEvent e) {
String propertyName = e.getPropertyName();
System.out.println("Property Name: "+propertyName);
if (e.getPropertyName().equals(AbstractButton.TEXT_CHANGED_PROPERTY)) {
String newText = (String) e.getNewValue();
String oldText = (String) e.getOldValue();
System.out.println(oldText + " changed to " + newText);
} else if (e.getPropertyName().equals(AbstractButton.ICON_CHANGED_PROPERTY)) {
Icon icon = (Icon) e.getNewValue();
if (icon instanceof ImageIcon) {
System.out.println("New icon is an image");
}
}
}
}
public class AbstractButtonPropertyChangeListenerDemo {
public static void main(String[] a) {
JFrame frame = new JFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
AbstractButton bn = new JButton("asdf");
bn.addPropertyChangeListener(new AbstractButtonPropertyChangeListener());
bn.setText("fdsa");
frame.add(bn);
frame.setSize(300, 200);
frame.setVisible(true);
}
}
Constants for AbstractButton PropertyChangeListener
- BORDER_PAINTED_CHANGED_PROPERTY
- CONTENT_AREA_FILLED_CHANGED_PROPERTY
- DISABLED_ICON_CHANGED_PROPERTY
- DISABLED_SELECTED_ICON_CHANGED_PROPERTY
- FOCUS_PAINTED_CHANGED_PROPERTY
- HORIZONTAL_ALIGNMENT_CHANGED_PROPERTY
- HORIZONTAL_TEXT_POSITION_CHANGED_PROPERTY
- ICON_CHANGED_PROPERTY
- MARGIN_CHANGED_PROPERTY
- MNEMONIC_CHANGED_PROPERTY
- MODEL_CHANGED_PROPERTY
- PRESSED_ICON_CHANGED_PROPERTY
- ROLLOVER_ENABLED_CHANGED_PROPERTY
- ROLLOVER_ICON_CHANGED_PROPERTY
- ROLLOVER_SELECTED_ICON_CHANGED_PROPERTY
- SELECTED_ICON_CHANGED_PROPERTY
- TEXT_CHANGED_PROPERTY
- VERTICAL_ALIGNMENT_CHANGED_PROPERTY
- VERTICAL_TEXT_POSITION_CHANGED_PROPERTY
Supporting HTML text
import javax.swing.AbstractButton;
import javax.swing.JButton;
import javax.swing.JFrame;
public class HTMLDemoAbstractButton {
public static void main(String[] a) {
JFrame frame = new JFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
AbstractButton bn = new JButton();
bn.setText ("<html>Last Name<br><font face="courier new""
+ " color=red> (mandatory) </font></html>");
frame.add(bn);
frame.setSize(300, 200);
frame.setVisible(true);
}
}
