Focus Example : Focus « Swing JFC « Java

1. Java
2. Swing JFC
3. Focus

Focus Example

  

import java.awt.AWTKeyStroke;
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Container;
import java.awt.Dimension;
import java.awt.GridLayout;
import java.awt.KeyboardFocusManager;
import java.awt.event.KeyEvent;

import javax.swing.JButton;
import javax.swing.JDesktopPane;
import javax.swing.JFrame;
import javax.swing.JInternalFrame;
import javax.swing.JPanel;

public class FocusExample extends JFrame {

  public FocusExample() {

    super("Focus Example");
    setDefaultCloseOperation(EXIT_ON_CLOSE);
    MyPanel mypanel = new MyPanel();

    JButton button1 = new JButton("One");
    JButton button2 = new JButton("Two");
    JButton button3 = new JButton("Three");
    JButton button4 = new JButton("Four");
    JButton button5 = new MyButton("Five*");
    JButton button6 = new MyButton("Six*");
    JButton button7 = new JButton("Seven");

    mypanel.add(button2);
    mypanel.add(button3);

    JInternalFrame frame1 = new JInternalFrame("Internal Frame 1", true,
        true, true, true);

    frame1.setBackground(Color.lightGray);
    frame1.getContentPane().setLayout(new GridLayout(2, 3));
    frame1.setSize(300, 200);

    frame1.getContentPane().add(button1);
    frame1.getContentPane().add(mypanel);
    frame1.getContentPane().add(button4);
    frame1.getContentPane().add(button5);
    frame1.getContentPane().add(button6);
    frame1.getContentPane().add(button7);

    JDesktopPane desktop = new JDesktopPane();
    desktop.add(frame1, new Integer(1));
    desktop.setOpaque(true);

    //  Now set up the user interface window.
    Container contentPane = getContentPane();
    contentPane.add(desktop, BorderLayout.CENTER);
    setSize(new Dimension(400, 300));
    frame1.setVisible(true);
    setVisible(true);
  }

  public static void main(String[] args) {
    new FocusExample();
  }

  class MyButton extends JButton {
    public MyButton(String s) {
      super(s);
    }

    public boolean isFocusable() {
      return false;
    }
  }

  class MyPanel extends JPanel {
    public MyPanel() {
      super(true);
      java.util.Set upKeys = new java.util.HashSet(1);
      upKeys.add(AWTKeyStroke.getAWTKeyStroke(KeyEvent.VK_UP, 0));
      setFocusTraversalKeys(KeyboardFocusManager.UP_CYCLE_TRAVERSAL_KEYS,
          upKeys);
    }

    public boolean isFocusCycleRoot() {
      return true;
    }
  }
}

           
         
    
  

Related examples in the same category

1.	Focus Cycle Sample
2.	Button Focus
3.	Focus Traversal Example
4.	Focus Concepts Demo
5.	Track Focus Demo
6.	Focus Traversal Demo
7.	Use this method to determine whether a particular component has the focus
8.	Handling Focus Changes
9.	Requests focus for a component
10.	Requests focus unless the component already has focus