为什么mouselistener不工作？ [英] Why isn't mouselistener working?
问题描述
这是代码。它在面板中打印出鼠标位置，但不显示JTextArea。我还将鼠标监听器添加到文本区域？问题是整个JFrame中的坐标不一致。有没有办法只有一个覆盖整个jframe的mouselist？
有没有办法在textarea中禁用鼠标监听器？
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.awt.event.MouseMotionListener;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JTextArea;
public class test extends JFrame {
public test（）{
setPreferredSize（new Dimension（600,400））;
JPanel p = new JPanel（）;
p.setBackground（Color.blue）;
p.setPreferredSize（new Dimension（600,200））;
JTextArea t = new JTextArea（）;
t.setPreferredSize（new Dimension（600,200））;
add（p，BorderLayout.NORTH）;
add（t，BorderLayout.SOUTH）;
pack（）;
MouseInput m = new MouseInput（）;
addMouseMotionListener（m）;
t.addMouseMotionListener（m）;
setVisible（true）;
}
public static void main（String [] args）{
new test（）;
}
public class MouseInput implements MouseMotionListener {
@Override
public void mouseDragged（MouseEvent e）{
}
@Override
public void mouseMoved（MouseEvent e）{
int mx = e.getX（）;
int my = e.getY（）;
System.out.println（mx +，+ my）;
}
}
}
想想你的老鼠事件，如雨。他们从您的组件层次结构的顶部落下，直到某些东西停止。
一旦停止，他们将不再通知层次结构中较低的其他监听器。
在你的程序中，有$ code> JPanel 和 JTextField 坐在另一个坐在框架顶部的 JLayeredPane 上的组件（内容窗格）任何一个可能会消耗鼠标事件。
尝试将 MouseInput 添加到您的 JPanel ， p 而是
已更新 p>
这是一个全局鼠标监听器的示例（由@Hovercraft Full Of Eels提出，它将被锤击，因为每个鼠标事件都将通过它。
它还演示了如何将鼠标点从本地上下文转换为另一个上下文。
import java.awt.AWTEvent;
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt .EventQueue;
import java.awt.Point;
import java.awt.Toolkit;
import java.awt.Window;
import java.awt.event.AWTEventListener;
import java.awt.event.MouseEvent;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swi ng.SwingUtilities;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
public class GloablMouseListener {
public static void main（String [] args）{
new GloablMouseListener（）;
}
public GloablMouseListener（）{
EventQueue.invokeLater（new Runnable（）{
@Override
public void run（）{
尝试{
UIManager.setLookAndFeel（UIManager.getSystemLookAndFeelClassName（））;
} catch（ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex）{
}
JFrame框架= new JFrame（Testing）;
frame.setDefaultCloseOperation（JFrame.EXIT_ON_CLOSE）;
frame.setLayout（new BorderLayout（））;
frame.add（new TestPane（））;
frame.pack（）;
frame.setLocationRelativeTo（null）;
frame.setVisible（true）;
}
}）;
}
public class TestPane扩展JPanel {
public TestPane（）{
setLayout（new BorderLayout（））;
JPanel panel = new JPanel（）;
panel.setBackground（Color.BLUE）;
JTextArea ta = new JTextArea（10，20）;
add（panel，BorderLayout.NORTH）;
add（new JScrollPane（ta），BorderLayout.SOUTH）;
Toolkit.getDefaultToolkit（）。addAWTEventListener（new AWTEventListener（）{
@Override
public void eventDispatched（AWTEvent event）{
if（event instanceof MouseEvent）{
MouseEvent e =（MouseEvent）事件;
System.out.println（Local point =+ e.getPoint（））;
点p = e.getPoint（）;
窗口窗口= SwingUtilities.getWindowAncestor（e.getComponent（））;
if（window！= e.getSource（）&& window！= null）{
p = SwingUtilities.convertPoint .getComponent（），e.getPoint（），window）;
}
System.out.println（Global point =+ p）;
}
}
}，AWTEvent.MOUSE_EVENT_MASK | AWTEvent.MOUSE_MOTION_EVENT_MASK）;
}
@Override
public Dimension getPreferredSize（）{
return new Dimension（200，200）;
}
}
}
Here's the code. It prints out the mouse location when it's in the panel but not the JTextArea. I added the mouse listener to the text area as well? The problem is that the coordinates are not consistent throughout the JFrame. Is there a way to just have one mouselistener that covers the entire jframe?
Is there a way to disable the mouse listener in the textarea?
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.awt.event.MouseMotionListener;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JTextArea;
public class test extends JFrame {
public test(){
setPreferredSize(new Dimension(600,400));
JPanel p = new JPanel();
p.setBackground(Color.blue);
p.setPreferredSize(new Dimension(600,200));
JTextArea t = new JTextArea();
t.setPreferredSize(new Dimension(600,200));
add(p,BorderLayout.NORTH);
add(t,BorderLayout.SOUTH);
pack();
MouseInput m = new MouseInput();
addMouseMotionListener(m);
t.addMouseMotionListener(m);
setVisible(true);
}
public static void main(String[] args){
new test();
}
public class MouseInput implements MouseMotionListener{
@Override
public void mouseDragged(MouseEvent e) {
}
@Override
public void mouseMoved(MouseEvent e) {
int mx = e.getX();
int my = e.getY();
System.out.println(mx + "," + my);
}
}
}
Think of your mouse events like rain. They fall from the top of your component hierarchy down until something stops them.
Once stopped, they will no long notify other listeners lower in the hierarchy.
In you program you have and JPanel and JTextField sitting on top of another component (the content pane) sitting on a JLayeredPane sitting on top of the frame. Any one of these may be consuming the mouse event.
Try adding the MouseInput to your JPanel, p instead
Updated
This is an example of a global mouse listener (as suggested by @Hovercraft Full Of Eels, it WILL get hammered, as every mouse event will pass through it.
It also demonstrates how to translate a mouse point from it's local context to another context.
import java.awt.AWTEvent;
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.Point;
import java.awt.Toolkit;
import java.awt.Window;
import java.awt.event.AWTEventListener;
import java.awt.event.MouseEvent;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.SwingUtilities;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
public class GloablMouseListener {
public static void main(String[] args) {
new GloablMouseListener();
}
public GloablMouseListener() {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
}
JFrame frame = new JFrame("Testing");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLayout(new BorderLayout());
frame.add(new TestPane());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
public class TestPane extends JPanel {
public TestPane() {
setLayout(new BorderLayout());
JPanel panel = new JPanel();
panel.setBackground(Color.BLUE);
JTextArea ta = new JTextArea(10, 20);
add(panel, BorderLayout.NORTH);
add(new JScrollPane(ta), BorderLayout.SOUTH);
Toolkit.getDefaultToolkit().addAWTEventListener(new AWTEventListener() {
@Override
public void eventDispatched(AWTEvent event) {
if (event instanceof MouseEvent) {
MouseEvent e = (MouseEvent) event;
System.out.println("Local point = " + e.getPoint());
Point p = e.getPoint();
Window window = SwingUtilities.getWindowAncestor(e.getComponent());
if (window != e.getSource() && window != null) {
p = SwingUtilities.convertPoint(e.getComponent(), e.getPoint(), window);
}
System.out.println("Global point = " + p);
}
}
}, AWTEvent.MOUSE_EVENT_MASK | AWTEvent.MOUSE_MOTION_EVENT_MASK);
}
@Override
public Dimension getPreferredSize() {
return new Dimension(200, 200);
}
}
}
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