在视口组件上使用JScrollPane鼠标侦听器 [英] Use JScrollPane mouse listener over viewport components
问题描述
我有一个 JScrollPane
可以将 viewportView 设置为一系列不同的面板。我希望在单击其视口中的任何其他组件时获取JScrollPane组件。如果我将一个 MouseListener
添加到JScrollPane,当我直接点击窗格的边框时,它会收到我的鼠标事件,但是当我点击组件时却没有。
I have a JScrollPane
that can set its viewportView to a range of different panels. I want to get the JScrollPane component whenever any other component in its viewport is clicked. If I add a MouseListener
to the JScrollPane, it receives my mouse events when I click directly on the border of the pane, but not when I click on the components.
添加监听器并最终找到封闭的scrollPane的正确方法是什么?我不一定提前知道我在视口中显示的面板上的所有组件 - 只是它们将在JPanel的某个子类上。
What's the right way to go about adding listeners and ultimately finding the enclosing scrollPane? I won't necessarily know ahead of time all the components on the panel that I show in the viewport - just that they'll be on some subclass of JPanel.
import java.awt.event.MouseEvent;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.event.MouseInputAdapter;
import net.miginfocom.swing.MigLayout;
public class TestScrollPane extends MouseInputAdapter{
public void mouseEntered(MouseEvent arg0) {System.out.println("Entered " + arg0.getComponent());}
public void mouseExited(MouseEvent arg0) {System.out.println("Exited " + arg0.getComponent());}
public void mousePressed(MouseEvent arg0) {System.out.println("Pressed " + arg0.getComponent());}
public void mouseReleased(MouseEvent arg0) {System.out.println("Released " + arg0.getComponent());}
public static void main(String[] args){
JFrame frame = new JFrame();
frame.setLayout(new MigLayout());
frame.setSize(400, 400);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
TestPane pane1 = new TestPane("Scroll Pane 1");
TestPane pane2 = new TestPane("Scroll Pane 2");
frame.add(pane1, "push,grow");
frame.add(pane2, "push, grow");
TestMouseListener listener = new TestMouseListener();
pane1.addMouseListener(listener);
pane1.addMouseMotionListener(listener);
pane2.addMouseListener(listener);
pane2.addMouseMotionListener(listener);
frame.setVisible(true);
}
}
class TestPanel2 extends JPanel {
String name;
TestPanel2(String name){
this.name = name;
setLayout(new MigLayout());
JTextArea area = new JTextArea();
area.append(name);
add(area, "push, grow");
}
public String toString(){ return name; }
}
class TestPane extends JScrollPane {
String name;
TestPane(String name){
this.name = name;
TestPanel2 panel = new TestPanel2(name + " panel");
setViewportView(panel);
}
public String toString(){ return name; }
}
在这个例子中,我得到鼠标进入和退出事件,但我可以只有通过单击文本区域周围的边框才能获得鼠标单击事件。即使我更改了TestPane类以将侦听器添加到其viewportView面板,我也无法分辨textArea中发生了什么。
In this example, I get mouse enter and exit events, but I can only get the mouse clicked event by clicking on the border around the text area. Even if I change the TestPane class to add listeners to its viewportView panel, I can't tell what's going on in the textArea.
class TestPane extends JScrollPane {
String name;
TestPane(String name){
this.name = name;
TestPanel2 panel = new TestPanel2(name + " panel");
TestMouseListener listener = new TestMouseListener();
panel.addMouseListener(listener);
panel.addMouseMotionListener(listener);
setViewportView(panel);
}
public String toString(){ return name; }
}
我不会知道JPanel上的内容,不过,所以我无法更深入地手动添加监听器。
I won't have any way of knowing what's on the JPanel, though, so I can't manually add listeners any deeper.
推荐答案
另一种可能的方法是使用AWTEventListener,然后冒泡父树,用于查看您感兴趣的组件是否已被按下或者是否已按下该子组件。例如:
Another possible way is to use an AWTEventListener, and then bubble up the parent tree to see if your component of interest has been pressed or holds a child that has been pressed. For example:
import java.awt.AWTEvent;
import java.awt.Component;
import java.awt.FlowLayout;
import java.awt.Toolkit;
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.event.MouseInputAdapter;
// import net.miginfocom.swing.MigLayout;
public class TestScrollPane extends MouseInputAdapter {
public void mouseEntered(MouseEvent arg0) {
System.out.println("Entered " + arg0.getComponent());
}
public void mouseExited(MouseEvent arg0) {
System.out.println("Exited " + arg0.getComponent());
}
public void mousePressed(MouseEvent arg0) {
System.out.println("Pressed " + arg0.getComponent());
}
public void mouseReleased(MouseEvent arg0) {
System.out.println("Released " + arg0.getComponent());
}
public static void main(String[] args) {
JFrame frame = new JFrame();
// frame.setLayout(new MigLayout());
frame.getContentPane().setLayout(new FlowLayout());
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
TestPane pane1 = new TestPane("Scroll Pane 1");
TestPane pane2 = new TestPane("Scroll Pane 2");
frame.add(pane1, "push,grow");
frame.add(pane2, "push, grow");
// !! TestMouseListener listener = new TestMouseListener();
TestScrollPane listener = new TestScrollPane();
pane1.addMouseListener(listener);
pane1.addMouseMotionListener(listener);
pane2.addMouseListener(listener);
pane2.addMouseMotionListener(listener);
frame.pack();
frame.setVisible(true);
Toolkit.getDefaultToolkit().addAWTEventListener(
listener.createAWTWindowListener(), AWTEvent.MOUSE_EVENT_MASK);
}
private AWTEventListener createAWTWindowListener() {
AWTEventListener awt1 = new AWTEventListener() {
@Override
public void eventDispatched(AWTEvent e) {
if (MouseEvent.MOUSE_PRESSED == e.getID()) {
MouseEvent event = (MouseEvent) e;
Component comp = event.getComponent();
if (comp != null) {
String scrollPanelName = recursivelyCheckForScrollPanel(comp);
if (scrollPanelName != null) {
System.out.println("TestPane pressed. Name: " + scrollPanelName);
} else {
System.out.println("TestPane not pressed");
}
}
}
}
private String recursivelyCheckForScrollPanel(Component comp) {
if (comp instanceof TestPane) {
return comp.toString();
} else {
comp = comp.getParent();
if (comp != null) {
return recursivelyCheckForScrollPanel(comp);
}
}
return null;
}
};
return awt1;
}
}
class TestPanel2 extends JPanel {
String name;
TestPanel2(String name) {
this.name = name;
// setLayout(new MigLayout());
JTextArea area = new JTextArea(5, 20);
area.append(name);
add(area, "push, grow");
}
public String toString() {
return name;
}
}
class TestPane extends JScrollPane {
String name;
TestPane(String name) {
this.name = name;
TestPanel2 panel = new TestPanel2(name + " panel");
setViewportView(panel);
}
public String toString() {
return name;
}
}
注意:请参阅这个问题和StanislovL和mkorbel的答案更多关于此事。
Note: Please see this question and StanislovL's and mkorbel's answers for more on this.
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