How to Write a Mouse-Motion Listener : MouseMotionListener « Swing Event « Java Tutorial






How to Write a Mouse-Motion Listener
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import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.event.MouseEvent;
import java.awt.event.MouseMotionListener;

import javax.swing.BorderFactory;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;

public class MouseMotionEventDemo extends JPanel implements MouseMotionListener {
  BlankArea blankArea = new BlankArea(new Color(0.98f, 0.97f, 0.85f));

  JTextArea textArea = new JTextArea();

  public MouseMotionEventDemo() {
    super(new BorderLayout());

    add(blankArea,"North");

    
    textArea.setEditable(false);
    JScrollPane scrollPane = new JScrollPane(textArea, JScrollPane.VERTICAL_SCROLLBAR_ALWAYS,
        JScrollPane.HORIZONTAL_SCROLLBAR_AS_NEEDED);
    scrollPane.setPreferredSize(new Dimension(200, 75));
    add(scrollPane,"Center");

    // Register for mouse events on blankArea and panel.
    blankArea.addMouseMotionListener(this);
    addMouseMotionListener(this);

    setPreferredSize(new Dimension(450, 450));
    setBorder(BorderFactory.createEmptyBorder(20, 20, 20, 20));
  }

  public void mouseMoved(MouseEvent e) {
    saySomething("Mouse moved", e);
  }

  public void mouseDragged(MouseEvent e) {
    saySomething("Mouse dragged", e);
  }

  void saySomething(String eventDescription, MouseEvent e) {
    textArea.append(eventDescription + " (" + e.getX() + "," + e.getY() + ")" + " detected on "
        + e.getComponent().getClass().getName() + "\n");
    textArea.setCaretPosition(textArea.getDocument().getLength());
  }

  public static void main(String[] args) {
    JFrame frame = new JFrame("MouseMotionEventDemo");
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

    // Create and set up the content pane.
    JComponent newContentPane = new MouseMotionEventDemo();
    newContentPane.setOpaque(true); // content panes must be opaque
    frame.setContentPane(newContentPane);

    // Display the window.
    frame.pack();
    frame.setVisible(true);
  }
}

class BlankArea extends JLabel {
  Dimension minSize = new Dimension(100, 100);

  public BlankArea(Color color) {
    setBackground(color);
    setOpaque(true);
    setBorder(BorderFactory.createLineBorder(Color.black));
  }

  public Dimension getMinimumSize() {
    return minSize;
  }

  public Dimension getPreferredSize() {
    return minSize;
  }
}








15.30.MouseMotionListener
15.30.1.The MouseMotionListener Interface
15.30.2.Demonstrates mouse motion eventsDemonstrates mouse motion events
15.30.3.How to Write a Mouse-Motion ListenerHow to Write a Mouse-Motion Listener
15.30.4.Handle mouse motion event