Java Tutorial/SWT/MouseEvent

Add Mouse Down, Up and Move event

import org.eclipse.swt.SWT;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Event;
import org.eclipse.swt.widgets.Listener;
import org.eclipse.swt.widgets.Shell;
public class MouseEventDownUpMove {
  public static void main(String[] args) {
    Display display = new Display();
    final Shell shell = new Shell(display);
    Listener listener = new Listener() {
      public void handleEvent(Event event) {
        switch (event.type) {
        case SWT.MouseDown:
          System.out.println("down:" + event);
          break;
        case SWT.MouseMove:
          System.out.println("move:"+event);
          break;
        case SWT.MouseUp:
          System.out.println("Up:"+event);
          break;
        }
      }
    };
    shell.addListener(SWT.MouseDown, listener);
    shell.addListener(SWT.MouseUp, listener);
    shell.addListener(SWT.MouseMove, listener);
    shell.setSize(300, 300);
    shell.open();
    while (!shell.isDisposed()) {
      if (!display.readAndDispatch())
        display.sleep();
    }
    display.dispose();
  }
}

Composite: intercept mouse events (drag a button with the mouse)

/*******************************************************************************
 * Copyright (c) 2000, 2004 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
/*
 * Composite example snippet: intercept mouse events (drag a button with the mouse)
 *
 * For a list of all SWT example snippets see
 * http://www.eclipse.org/swt/snippets/
 */
import org.eclipse.swt.SWT;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.graphics.Rectangle;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.ruposite;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Event;
import org.eclipse.swt.widgets.Listener;
import org.eclipse.swt.widgets.Shell;
public class DragButtonMouseEvents {
  public static void main(String[] args) {
    Display display = new Display();
    final Shell shell = new Shell(display);
    final Composite composite = new Composite(shell, SWT.NONE);
    composite.setEnabled(false);
    composite.setLayout(new FillLayout());
    Button button = new Button(composite, SWT.PUSH);
    button.setText("Button");
    composite.pack();
    composite.setLocation(10, 10);
    final Point[] offset = new Point[1];
    Listener listener = new Listener() {
      public void handleEvent(Event event) {
        switch (event.type) {
        case SWT.MouseDown:
          Rectangle rect = composite.getBounds();
          if (rect.contains(event.x, event.y)) {
            Point pt1 = composite.toDisplay(0, 0);
            Point pt2 = shell.toDisplay(event.x, event.y);
            offset[0] = new Point(pt2.x - pt1.x, pt2.y - pt1.y);
          }
          break;
        case SWT.MouseMove:
          if (offset[0] != null) {
            Point pt = offset[0];
            composite.setLocation(event.x - pt.x, event.y - pt.y);
          }
          break;
        case SWT.MouseUp:
          offset[0] = null;
          break;
        }
      }
    };
    shell.addListener(SWT.MouseDown, listener);
    shell.addListener(SWT.MouseUp, listener);
    shell.addListener(SWT.MouseMove, listener);
    shell.setSize(300, 300);
    shell.open();
    while (!shell.isDisposed()) {
      if (!display.readAndDispatch())
        display.sleep();
    }
    display.dispose();
  }
}

Detect mouse enter, exit and hover events

import org.eclipse.swt.SWT;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Event;
import org.eclipse.swt.widgets.Listener;
import org.eclipse.swt.widgets.Shell;
public class MouseEventEnterExit {
  public static void main(String[] args) {
    Display display = new Display();
    Shell shell = new Shell(display);
    shell.setSize(100, 100);
    shell.addListener(SWT.MouseEnter, new Listener() {
      public void handleEvent(Event e) {
        System.out.println("ENTER");
      }
    });
    shell.addListener(SWT.MouseExit, new Listener() {
      public void handleEvent(Event e) {
        System.out.println("EXIT");
      }
    });
    shell.addListener(SWT.MouseHover, new Listener() {
      public void handleEvent(Event e) {
        System.out.println("HOVER");
      }
    });
    shell.open();
    while (!shell.isDisposed()) {
      if (!display.readAndDispatch())
        display.sleep();
    }
    display.dispose();
  }
}

extends MouseTrackAdapter

import org.eclipse.swt.SWT;
import org.eclipse.swt.events.MouseEvent;
import org.eclipse.swt.events.MouseTrackAdapter;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Label;
import org.eclipse.swt.widgets.Shell;
public class MouseTrackAdapter {
  public static void main(String[] args) {
    Display display = new Display();
    Shell shell = new Shell(display);
    Label label = new Label(shell, SWT.SHADOW_IN | SWT.CENTER);
    shell.setLayout(new GridLayout());
    MouseTrackAdapter listener = new MouseEnterExitListener();
    label.setText("Point your cursor here ...");
    label.setBounds(30, 30, 200, 30);
    label.addMouseTrackListener(listener);
    shell.setSize(260, 120);
    shell.open();
    shell.open();
    while (!shell.isDisposed()) {
      if (!display.readAndDispatch()) {
        display.sleep();
      }
    }
  }
}
class MouseEnterExitListener extends MouseTrackAdapter {
  public void mouseEnter(MouseEvent e) {
        System.out.println("Cursor enters the label");
  }
  public void mouseExit(MouseEvent arg0) {
    System.out.println("Cursor leaves the label");
  }
}

Print mouse state and button (down, move, up)

/*******************************************************************************
 * Copyright (c) 2000, 2004 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
/*
 * Control example snippet: print mouse state and button (down, move, up)
 * 
 * For a list of all SWT example snippets see
 * http://www.eclipse.org/swt/snippets/
 * 
 * @since 3.1
 */
import org.eclipse.swt.SWT;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Event;
import org.eclipse.swt.widgets.Listener;
import org.eclipse.swt.widgets.Shell;
public class MouseButtonState {
  public static void main(String[] args) {
    Display display = new Display();
    final Shell shell = new Shell(display);
    Listener listener = new Listener() {
      public void handleEvent(Event e) {
        String string = "Unknown";
        switch (e.type) {
        case SWT.MouseDown:
          string = "DOWN";
          break;
        case SWT.MouseMove:
          string = "MOVE";
          break;
        case SWT.MouseUp:
          string = "UP";
          break;
        }
        string += ": button: " + e.button + ", ";
        string += "stateMask=0x" + Integer.toHexString(e.stateMask);
        if ((e.stateMask & SWT.BUTTON1) != 0)
          string += " BUTTON1";
        if ((e.stateMask & SWT.BUTTON2) != 0)
          string += " BUTTON2";
        if ((e.stateMask & SWT.BUTTON3) != 0)
          string += " BUTTON3";
        if ((e.stateMask & SWT.BUTTON4) != 0)
          string += " BUTTON4";
        if ((e.stateMask & SWT.BUTTON5) != 0)
          string += " BUTTON5";
        System.out.println(string);
      }
    };
    shell.addListener(SWT.MouseDown, listener);
    shell.addListener(SWT.MouseMove, listener);
    shell.addListener(SWT.MouseUp, listener);
    shell.pack();
    shell.open();
    while (!shell.isDisposed()) {
      if (!display.readAndDispatch())
        display.sleep();
    }
    display.dispose();
  }
}

Using MouseListener

import org.eclipse.swt.events.MouseEvent;
import org.eclipse.swt.events.MouseListener;
import org.eclipse.swt.layout.RowLayout;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;
public class MouseListenerUsing {
  public static void main(String[] args) {
    Display display = new Display();
    Shell shell = new Shell(display);
    shell.setLayout(new RowLayout());
    shell.addMouseListener(new MouseListener() {
      public void mouseDoubleClick(MouseEvent arg0) {
        System.out.println("mouseDoubleClick");
      }
      public void mouseDown(MouseEvent arg0) {
        System.out.println("mouseDown");
      }
      public void mouseUp(MouseEvent arg0) {
        System.out.println("mouseUp");
      }
    });
    // Display the window
    shell.open();
    while (!shell.isDisposed()) {
      if (!display.readAndDispatch()) {
        display.sleep();
      }
    }
    display.dispose();
  }
}

Using MouseListener, MouseMoveListener, and MouseTrackListener

1. SWT divides mouse-related activity into three separate listener interfaces.
2. MouseListener interface receives notification of mouse click events.
3. MouseTrackListener receives notification when the mouse enters, exits, or hovers over the associated widget.
4. MouseMoveListener receives notification each time the mouse moves.

Using MouseMoveListener

import org.eclipse.swt.events.MouseEvent;
import org.eclipse.swt.events.MouseMoveListener;
import org.eclipse.swt.layout.RowLayout;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;
public class MouseMoveListenerUsing {
  public static void main(String[] args) {
    Display display = new Display();
    Shell shell = new Shell(display);
    shell.setLayout(new RowLayout());
    shell.addMouseMoveListener(new MouseMoveListener() {
      public void mouseMove(MouseEvent arg0) {
        System.out.println(arg0.x);
      }
    });
    // Display the window
    shell.open();
    while (!shell.isDisposed()) {
      if (!display.readAndDispatch()) {
        display.sleep();
      }
    }
    display.dispose();
  }
}

Using MouseTrackListener

import org.eclipse.swt.events.MouseEvent;
import org.eclipse.swt.events.MouseTrackListener;
import org.eclipse.swt.layout.RowLayout;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;
public class MouseTrackListenerUsing {
  public static void main(String[] args) {
    Display display = new Display();
    Shell shell = new Shell(display);
    shell.setLayout(new RowLayout());
    shell.addMouseTrackListener(new MouseTrackListener() {
      public void mouseEnter(MouseEvent arg0) {
        System.out.println("mouseEnter");
      }
      public void mouseExit(MouseEvent arg0) {
        System.out.println("mouseExit");
      }
      public void mouseHover(MouseEvent arg0) {
        System.out.println("mouseHover");
      }
    });
    // Display the window
    shell.open();
    while (!shell.isDisposed()) {
      if (!display.readAndDispatch()) {
        display.sleep();
      }
    }
    display.dispose();
  }
}