Action, Mouse Focus : Various Event Listener « Event « Java

1. Java
2. Event
3. Various Event Listener

Action, Mouse Focus

  
import java.awt.Component;
import java.awt.Container;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.*;

import javax.swing.JButton;
import javax.swing.JFrame;

public class FocusSample {
  public static void main(String args[]) {
    JFrame frame = new JFrame("Focus Sample");

    ActionListener actionListener = new ActionFocusMover();
    MouseListener mouseListener = new MouseEnterFocusMover();

    Container contentPane = frame.getContentPane();
    contentPane.setLayout(new GridLayout(3, 3));
    for (int i = 1; i < 10; i++) {
      JButton button = new JButton("" + i);
      button.addActionListener(actionListener);
      button.addMouseListener(mouseListener);
      if ((i % 2) != 0) {
        button.setRequestFocusEnabled(false);
      }
      contentPane.add(button);
    }

    frame.setSize(300, 200);
    frame.setVisible(true);
  }
}

class ActionFocusMover implements ActionListener {
  public void actionPerformed(ActionEvent actionEvent) {
    Object source = actionEvent.getSource();
    if (source instanceof Component) {
      Component component = (Component) source;
      component.transferFocus();
    }
  }
}
class MouseEnterFocusMover extends MouseAdapter {
  public void mouseEntered(MouseEvent mouseEvent) {
    Component component = mouseEvent.getComponent();
    if (!component.hasFocus()) {
      component.requestFocus();
    }
  }
}

           
         
    
  

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