?? popuptest.java
字號(hào):
// Demonstrating JPopupMenus
import javax.swing.*;
import java.awt.event.*;
import java.awt.*;
public class PopupTest extends JFrame {
private JRadioButtonMenuItem items[];
private Color colorValues[] =
{ Color.blue, Color.yellow, Color.red };
public PopupTest()
{
super( "Using JPopupMenus" );
final JPopupMenu popupMenu = new JPopupMenu();
ItemHandler handler = new ItemHandler();
String colors[] = { "Blue", "Yellow", "Red" };
ButtonGroup colorGroup = new ButtonGroup();
items = new JRadioButtonMenuItem[ 3 ];
// construct each menu item and add to popup menu; also
// enable event handling for each menu item
for ( int i = 0; i < items.length; i++ ) {
items[ i ] = new JRadioButtonMenuItem( colors[ i ] );
popupMenu.add( items[ i ] );
colorGroup.add( items[ i ] );
items[ i ].addActionListener( handler );
}
getContentPane().setBackground( Color.white );
// define a MouseListener for the window that displays
// a JPopupMenu when the popup trigger event occurs
addMouseListener(
new MouseAdapter() {
public void mousePressed( MouseEvent e )
{ checkForTriggerEvent( e ); }
public void mouseReleased( MouseEvent e )
{ checkForTriggerEvent( e ); }
private void checkForTriggerEvent( MouseEvent e )
{
if ( e.isPopupTrigger() )
popupMenu.show( e.getComponent(),
e.getX(), e.getY() );
}
}
);
setSize( 300, 200 );
show();
}
public static void main( String args[] )
{
PopupTest app = new PopupTest();
app.addWindowListener(
new WindowAdapter() {
public void windowClosing( WindowEvent e )
{
System.exit( 0 );
}
}
);
}
private class ItemHandler implements ActionListener {
public void actionPerformed( ActionEvent e )
{
// determine which menu item was selected
for ( int i = 0; i < items.length; i++ )
if ( e.getSource() == items[ i ] ) {
getContentPane().setBackground(
colorValues[ i ] );
repaint();
return;
}
}
}
}
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