Problem to override a component's existing key binding
Hi !
Just tell me something, that how to override a component's key binding?
As you know, when a text field [ I mean to say her object of the JTextField ] has the focus, pressing
Ctrl + A key would select the entire line the text field contains.
But, I want the text field to do something different; for say, pressing Ctrl + A key text field
should display a JOptionPane's message dialog box.
How can I do this ?
If there is a way, then please send a code explaining that.
[523 byte] By [
Sunmembera] at [2007-10-1 14:18:00]
Hi,
You can overwrite the action in the ActionMap.
Try the following sample code.
import java.awt.* ;
import java.awt.event.* ;
import javax.swing.* ;
public class OverKB extends JFrame {
public OverKB() {
super( "Overriding existing Key Binding." ) ;
setDefaultCloseOperation( EXIT_ON_CLOSE ) ;
init() ;
setSize( 400 , 300 ) ;
setVisible( true ) ;
}
public void init() {
JTextArea ta = new JTextArea() ;
getContentPane().add( new JScrollPane( ta ) , BorderLayout.CENTER ) ;
ActionMap map = (ActionMap)UIManager.get( "TextArea.actionMap" );
map.put( "select-all" , new MyControlA() ) ;
}
public class MyControlA extends AbstractAction {
public void actionPerformed( ActionEvent actEvt ) {
JOptionPane.showMessageDialog( OverKB.this , "How is it?" , "Is it super?" , JOptionPane.INFORMATION_MESSAGE ) ;
}
}
public static void main(String[] args) {
new OverKB() ;
}
}
Please acknowledge me
