Java Tutorial/Swing Event/Mouse Event
Содержание
- 1 Detecting Double and Triple Clicks
- 2 Handling Mouse Clicks
- 3 InputEvent.BUTTON1_MASK (for left mouse button)
- 4 InputEvent.BUTTON2_MASK (for middle mouse button)
- 5 InputEvent.BUTTON3_MASK (for right mouse button)
- 6 Mouse event popup menu triggered
- 7 Right click to trigger the popup menu
- 8 Uses a subclass of MouseInputAdapter to listen to mouse events and mouse-motion events
- 9 Using SwingUtilities for Mouse Button Identification
Detecting Double and Triple Clicks
<source lang="java">
import java.awt.event.MouseAdapter; import java.awt.event.MouseEvent; import javax.swing.JFrame; import javax.swing.JTextField; public class Main {
public static void main(String[] argv) throws Exception {
JTextField component = new JTextField();
component.addMouseListener(new MyMouseListener());
JFrame f = new JFrame();
f.add(component);
f.setSize(300, 300);
f.setVisible(true);
component.addMouseListener(new MyMouseListener());
}
} class MyMouseListener extends MouseAdapter {
public void mouseClicked(MouseEvent evt) {
if (evt.getClickCount() == 3) {
System.out.println("triple-click");
} else if (evt.getClickCount() == 2) {
System.out.println("double-click");
}
}
}</source>
Handling Mouse Clicks
<source lang="java">
import java.awt.event.InputEvent; import java.awt.event.MouseAdapter; import java.awt.event.MouseEvent; import javax.swing.JFrame; import javax.swing.JTextField; public class Main {
public static void main(String[] argv) throws Exception {
JTextField component = new JTextField();
component.addMouseListener(new MyMouseListener());
JFrame f = new JFrame();
f.add(component);
f.setSize(300, 300);
f.setVisible(true);
}
} class MyMouseListener extends MouseAdapter {
public void mouseClicked(MouseEvent evt) {
if ((evt.getModifiers() & InputEvent.BUTTON1_MASK) != 0) {
System.out.println("left" + (evt.getPoint()));
}
if ((evt.getModifiers() & InputEvent.BUTTON2_MASK) != 0) {
System.out.println("middle" + (evt.getPoint()));
}
if ((evt.getModifiers() & InputEvent.BUTTON3_MASK) != 0) {
System.out.println("right" + (evt.getPoint()));
}
}
}</source>
InputEvent.BUTTON1_MASK (for left mouse button)
<source lang="java">
import java.awt.event.InputEvent; import java.awt.event.MouseAdapter; import java.awt.event.MouseEvent; import javax.swing.JFrame; import javax.swing.JTextField; public class Main {
public static void main(String[] argv) throws Exception {
JTextField component = new JTextField();
component.addMouseListener(new MyMouseListener());
JFrame f = new JFrame();
f.add(component);
f.setSize(300, 300);
f.setVisible(true);
}
} class MyMouseListener extends MouseAdapter {
public void mouseClicked(MouseEvent evt) {
if ((evt.getModifiers() & InputEvent.BUTTON1_MASK) != 0) {
System.out.println("left" + (evt.getPoint()));
}
if ((evt.getModifiers() & InputEvent.BUTTON2_MASK) != 0) {
System.out.println("middle" + (evt.getPoint()));
}
if ((evt.getModifiers() & InputEvent.BUTTON3_MASK) != 0) {
System.out.println("right" + (evt.getPoint()));
}
}
}</source>
InputEvent.BUTTON2_MASK (for middle mouse button)
<source lang="java">
import java.awt.event.InputEvent; import java.awt.event.MouseAdapter; import java.awt.event.MouseEvent; import javax.swing.JFrame; import javax.swing.JTextField; public class Main {
public static void main(String[] argv) throws Exception {
JTextField component = new JTextField();
component.addMouseListener(new MyMouseListener());
JFrame f = new JFrame();
f.add(component);
f.setSize(300, 300);
f.setVisible(true);
}
} class MyMouseListener extends MouseAdapter {
public void mouseClicked(MouseEvent evt) {
if ((evt.getModifiers() & InputEvent.BUTTON1_MASK) != 0) {
System.out.println("left" + (evt.getPoint()));
}
if ((evt.getModifiers() & InputEvent.BUTTON2_MASK) != 0) {
System.out.println("middle" + (evt.getPoint()));
}
if ((evt.getModifiers() & InputEvent.BUTTON3_MASK) != 0) {
System.out.println("right" + (evt.getPoint()));
}
}
}</source>
InputEvent.BUTTON3_MASK (for right mouse button)
<source lang="java">
import java.awt.event.InputEvent; import java.awt.event.MouseAdapter; import java.awt.event.MouseEvent; import javax.swing.JFrame; import javax.swing.JTextField; public class Main {
public static void main(String[] argv) throws Exception {
JTextField component = new JTextField();
component.addMouseListener(new MyMouseListener());
JFrame f = new JFrame();
f.add(component);
f.setSize(300, 300);
f.setVisible(true);
}
} class MyMouseListener extends MouseAdapter {
public void mouseClicked(MouseEvent evt) {
if ((evt.getModifiers() & InputEvent.BUTTON1_MASK) != 0) {
System.out.println("left" + (evt.getPoint()));
}
if ((evt.getModifiers() & InputEvent.BUTTON2_MASK) != 0) {
System.out.println("middle" + (evt.getPoint()));
}
if ((evt.getModifiers() & InputEvent.BUTTON3_MASK) != 0) {
System.out.println("right" + (evt.getPoint()));
}
}
}</source>
<source lang="java">
import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.awt.event.MouseAdapter; import java.awt.event.MouseEvent; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JMenuItem; import javax.swing.JPopupMenu; public class Test extends JFrame {
JPopupMenu menu = new JPopupMenu("Popup");
class MyLabel extends JLabel {
public MyLabel(String text) {
super(text);
addMouseListener(new PopupTriggerListener());
}
class PopupTriggerListener extends MouseAdapter {
public void mousePressed(MouseEvent ev) {
if (ev.isPopupTrigger()) {
menu.show(ev.getComponent(), ev.getX(), ev.getY());
}
}
public void mouseReleased(MouseEvent ev) {
if (ev.isPopupTrigger()) {
menu.show(ev.getComponent(), ev.getX(), ev.getY());
}
}
public void mouseClicked(MouseEvent ev) {
}
}
}
JLabel label = new MyLabel("right-click");
public Test() {
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JMenuItem item = new JMenuItem("Test1");
item.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
System.out.println("Menu item Test1");
}
});
menu.add(item);
item = new JMenuItem("Test2");
item.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
System.out.println("Menu item Test2");
}
});
menu.add(item);
getContentPane().add(label);
pack();
setSize(300, 100);
}
public static void main(String[] args) {
new Test().setVisible(true);
}
}</source>
<source lang="java">
import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.awt.event.MouseAdapter; import java.awt.event.MouseEvent; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JMenuItem; import javax.swing.JPopupMenu; public class Test extends JFrame {
JPopupMenu menu = new JPopupMenu("Popup");
class MyLabel extends JLabel {
public MyLabel(String text) {
super(text);
addMouseListener(new PopupTriggerListener());
}
class PopupTriggerListener extends MouseAdapter {
public void mousePressed(MouseEvent ev) {
if (ev.isPopupTrigger()) {
menu.show(ev.getComponent(), ev.getX(), ev.getY());
}
}
public void mouseReleased(MouseEvent ev) {
if (ev.isPopupTrigger()) {
menu.show(ev.getComponent(), ev.getX(), ev.getY());
}
}
public void mouseClicked(MouseEvent ev) {
}
}
}
JLabel label = new MyLabel("right-click");
public Test() {
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JMenuItem item = new JMenuItem("Test1");
item.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
System.out.println("Menu item Test1");
}
});
menu.add(item);
item = new JMenuItem("Test2");
item.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
System.out.println("Menu item Test2");
}
});
menu.add(item);
getContentPane().add(label);
pack();
setSize(300, 100);
}
public static void main(String[] args) {
new Test().setVisible(true);
}
}</source>
Uses a subclass of MouseInputAdapter to listen to mouse events and mouse-motion events
Uses a subclass of MouseInputAdapter to listen to mouse events and mouse-motion events on the root pane"s glass pane. Redispatches the events to underlying components.
<source lang="java">
/*
*
* Copyright (c) 1998 Sun Microsystems, Inc. All Rights Reserved.
*
* Sun grants you ("Licensee") a non-exclusive, royalty free, license to use,
* modify and redistribute this software in source and binary code form,
* provided that i) this copyright notice and license appear on all copies of
* the software; and ii) Licensee does not utilize the software in a manner
* which is disparaging to Sun.
*
* This software is provided "AS IS," without a warranty of any kind. ALL
* EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES, INCLUDING ANY
* IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE OR
* NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN AND ITS LICENSORS SHALL NOT BE
* LIABLE FOR ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING
* OR DISTRIBUTING THE SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL SUN OR ITS
* LICENSORS BE LIABLE FOR ANY LOST REVENUE, PROFIT OR DATA, OR FOR DIRECT,
* INDIRECT, SPECIAL, CONSEQUENTIAL, INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER
* CAUSED AND REGARDLESS OF THE THEORY OF LIABILITY, ARISING OUT OF THE USE OF
* OR INABILITY TO USE SOFTWARE, EVEN IF SUN HAS BEEN ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGES.
*
* This software is not designed or intended for use in on-line control of
* aircraft, air traffic, aircraft navigation or aircraft communications; or in
* the design, construction, operation or maintenance of any nuclear
* facility. Licensee represents and warrants that it will not use or
* redistribute the Software for such purposes.
*/
import java.awt.Color; import java.awt.ruponent; import java.awt.Container; import java.awt.FlowLayout; import java.awt.Graphics; import java.awt.Point; import java.awt.Toolkit; import java.awt.event.ItemEvent; import java.awt.event.ItemListener; import java.awt.event.MouseEvent; import javax.swing.AbstractButton; import javax.swing.JButton; import javax.swing.JCheckBox; import javax.swing.JComponent; import javax.swing.JFrame; import javax.swing.JMenu; import javax.swing.JMenuBar; import javax.swing.JMenuItem; import javax.swing.SwingUtilities; import javax.swing.event.MouseInputAdapter; /** A 1.4 application that requires no other files. */ public class GlassPaneDemo {
static private MyGlassPane myGlassPane;
/**
* Create the GUI and show it. For thread safety, this method should be
* invoked from the event-dispatching thread.
*/
private static void createAndShowGUI() {
// Create and set up the window.
JFrame frame = new JFrame("GlassPaneDemo");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
// Start creating and adding components.
JCheckBox changeButton = new JCheckBox("Glass pane \"visible\"");
changeButton.setSelected(false);
// Set up the content pane, where the "main GUI" lives.
Container contentPane = frame.getContentPane();
contentPane.setLayout(new FlowLayout());
contentPane.add(changeButton);
contentPane.add(new JButton("Button 1"));
contentPane.add(new JButton("Button 2"));
// Set up the menu bar, which appears above the content pane.
JMenuBar menuBar = new JMenuBar();
JMenu menu = new JMenu("Menu");
menu.add(new JMenuItem("Do nothing"));
menuBar.add(menu);
frame.setJMenuBar(menuBar);
// Set up the glass pane, which appears over both menu bar
// and content pane and is an item listener on the change
// button.
myGlassPane = new MyGlassPane(changeButton, menuBar, frame.getContentPane());
changeButton.addItemListener(myGlassPane);
frame.setGlassPane(myGlassPane);
// Show the window.
frame.pack();
frame.setVisible(true);
}
public static void main(String[] args) {
// Schedule a job for the event-dispatching thread:
// creating and showing this application"s GUI.
javax.swing.SwingUtilities.invokeLater(new Runnable() {
public void run() {
createAndShowGUI();
}
});
}
} /**
* We have to provide our own glass pane so that it can paint. */
class MyGlassPane extends JComponent implements ItemListener {
Point point;
// React to change button clicks.
public void itemStateChanged(ItemEvent e) {
setVisible(e.getStateChange() == ItemEvent.SELECTED);
}
protected void paintComponent(Graphics g) {
if (point != null) {
g.setColor(Color.red);
g.fillOval(point.x - 10, point.y - 10, 20, 20);
}
}
public void setPoint(Point p) {
point = p;
}
public MyGlassPane(AbstractButton aButton, JMenuBar menuBar, Container contentPane) {
CBListener listener = new CBListener(aButton, menuBar, this, contentPane);
addMouseListener(listener);
addMouseMotionListener(listener);
}
} /**
* Listen for all events that our check box is likely to be interested in. * Redispatch them to the check box. */
class CBListener extends MouseInputAdapter {
Toolkit toolkit;
Component liveButton;
JMenuBar menuBar;
MyGlassPane glassPane;
Container contentPane;
public CBListener(Component liveButton, JMenuBar menuBar, MyGlassPane glassPane,
Container contentPane) {
toolkit = Toolkit.getDefaultToolkit();
this.liveButton = liveButton;
this.menuBar = menuBar;
this.glassPane = glassPane;
this.contentPane = contentPane;
}
public void mouseMoved(MouseEvent e) {
redispatchMouseEvent(e, false);
}
public void mouseDragged(MouseEvent e) {
redispatchMouseEvent(e, false);
}
public void mouseClicked(MouseEvent e) {
redispatchMouseEvent(e, false);
}
public void mouseEntered(MouseEvent e) {
redispatchMouseEvent(e, false);
}
public void mouseExited(MouseEvent e) {
redispatchMouseEvent(e, false);
}
public void mousePressed(MouseEvent e) {
redispatchMouseEvent(e, false);
}
public void mouseReleased(MouseEvent e) {
redispatchMouseEvent(e, true);
}
// A more finished version of this method would
// handle mouse-dragged events specially.
private void redispatchMouseEvent(MouseEvent e, boolean repaint) {
Point glassPanePoint = e.getPoint();
Container container = contentPane;
Point containerPoint = SwingUtilities.convertPoint(glassPane, glassPanePoint, contentPane);
if (containerPoint.y < 0) { // we"re not in the content pane
if (containerPoint.y + menuBar.getHeight() >= 0) {
// The mouse event is over the menu bar.
// Could handle specially.
} else {
// The mouse event is over non-system window
// decorations, such as the ones provided by
// the Java look and feel.
// Could handle specially.
}
} else {
// The mouse event is probably over the content pane.
// Find out exactly which component it"s over.
Component component = SwingUtilities.getDeepestComponentAt(container, containerPoint.x,
containerPoint.y);
if ((component != null) && (component.equals(liveButton))) {
// Forward events over the check box.
Point componentPoint = SwingUtilities.convertPoint(glassPane, glassPanePoint, component);
component.dispatchEvent(new MouseEvent(component, e.getID(), e.getWhen(), e.getModifiers(),
componentPoint.x, componentPoint.y, e.getClickCount(), e.isPopupTrigger()));
}
}
// Update the glass pane if requested.
if (repaint) {
glassPane.setPoint(glassPanePoint);
glassPane.repaint();
}
}
}</source>
Using SwingUtilities for Mouse Button Identification
<source lang="java">
SwingUtilities.isLeftMouseButton(MouseEvent mouseEvent)
SwingUtilities.isMiddleMouseButton(MouseEvent mouseEvent) SwingUtilities.isRightMouseButton(MouseEvent mouseEvent)</source>
