如果已经运行如何触发 MouseListener 事件方法

Question

在我的代码中我有：

带有普通 JPanel 的 JFrame，其中包含一些 JComponent 对象。这些 JComponents 有： - JTextFields 列表。 - 一个侦听器，它在 mouseEntered 触发时突出显示其边框，并在 mouseExited 触发时隐藏它。由于当光标越过嵌套到 JComponent 中的 jtextField 时也会触发 mouseExited 方法，因此 mouseExited 方法的实现会在隐藏边框之前检查事件的光标位置是否在 JComponentArea 之外：

问题是：

如果您缓慢移动鼠标，代码似乎工作正常，但如果您在组件之间快速移动鼠标，有时 JComponent 的边框不会隐藏。我认为这可能是因为 mouseExited 在光标经过嵌套的 textField 时触发，然后在光标位于 JComponent 之外时再次触发，但我不确定真正的问题是什么。在此先感谢您的任何提示或帮助！

代码：

针对上述问题写了代码。这是 Jcomponent class (MyContainer) 和 class 包括 Main (MyClass):

import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.FlowLayout;

import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.SwingUtilities;


public class MyClass {

    public static void main(String[] args)  {       
        SwingUtilities.invokeLater(new Runnable() {
            public void run(){   
                int i=0;
                //mainWindow
                    JFrame mainWindow = new JFrame("MyFrame");
                    mainWindow.setLayout(new BorderLayout());
                    mainWindow.setMinimumSize(new Dimension(300,300));

                    JPanel viewPort = new JPanel();
                    viewPort.setLayout(new FlowLayout(FlowLayout.LEFT));

                    MyContainer one = new MyContainer();
                    MyContainer two = new MyContainer();
                    MyContainer three = new MyContainer();

                    viewPort.add(one);
                    viewPort.add(two);
                    viewPort.add(three);
                    mainWindow.add(viewPort,BorderLayout.CENTER);
                    mainWindow.setVisible(true);
            }
        });
    }

}





import java.awt.Color;
import java.awt.Dimension;
import java.awt.FlowLayout;
import java.awt.Point;
import java.awt.Rectangle;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;

import javax.swing.BorderFactory;
import javax.swing.JComponent;
import javax.swing.JTextField;

    @SuppressWarnings("serial")
    public  class MyContainer extends JComponent {
            JTextField text1 ;
            JTextField text2 ;
            JTextField text3 ;

            public MyContainer(){
                super.setLayout(new FlowLayout(FlowLayout.LEFT));
                super.setPreferredSize(new Dimension(200,50));
                super.setBorder(BorderFactory.createEmptyBorder(1, 1, 1, 1));
                super.setBackground(Color.green);

                text1 = new JTextField("LABEL_1");
                text1.setPreferredSize(new Dimension(60,30));
                text1.setEditable(false);
                this.add(text1);

                text2 = new JTextField("LABEL_2");
                text2.setPreferredSize(new Dimension(60,30));
                text2.setEditable(false);
                this.add(text2);

                text3 = new JTextField("LABEL_3");
                text3.setPreferredSize(new Dimension(60,30));
                text3.setEditable(false);
                this.add(text3);

                addListener();
            }

            private void addListener() {
                this.addMouseListener(new MouseListener() {
                    @Override
                    public void mouseEntered(MouseEvent e) {
                        MyContainer.this.setBorder(BorderFactory.createLineBorder(Color.BLUE));
                    }

                    @Override
                    public void mouseExited(MouseEvent e) {
                        Rectangle r = e.getComponent().getBounds();
                        Point p = e.getPoint();
                        if( p.x < 0 || p.y < 0 || p.x >= r.width || p.y >= r.height)
                            MyContainer.this.setBorder(BorderFactory.createEmptyBorder(1, 1, 1, 1));
                    }

                    @Override public void mouseClicked(MouseEvent e) { /*NOTHING*/ }
                    @Override public void mouseReleased(MouseEvent e) { /*NOTHING*/ }
                    @Override public void mousePressed(MouseEvent e) { /*NOTHING*/ }
                });         
            }
        }

Answer 1

我建议不要使用静态方法，但我不确定按您的方式进行操作是否会产生任何实际影响。我会推荐

public void mouseEntered(MouseEvent e) {
    ((MyContainer) e.getSource()).setBorder(...)
}

// and so forth

此外，问题可能与您的 mouseExited 方法有关。而不是使用 .getBounds() 我建议使用 instanceof

if(e.getSource() instanceof MyContainer) {
    // do the stuff
} else {
    // do nothing
}

或者：

if(!(e.getSource() instanceof JTextField)) {
    // do the stuff
} else {
    // do nothing
}

else 声明甚至不是必需的；为了完整起见，我将其包括在内。

Answer 2

这是使用 MyContainer.this.dispatchEvent(SwingUtilities.convertMouseEvent(JTextField, e, MyContainer.this)); 的一种可能实现：

import java.awt.*;
import java.awt.event.*;
import java.util.*;
import javax.swing.*;

public class MyClass2 {
  public static void main(String[] args)  {
    SwingUtilities.invokeLater(new Runnable() {
      public void run() {
        int i = 0;
        //mainWindow
        JFrame mainWindow = new JFrame("MyFrame");
        mainWindow.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
        mainWindow.setMinimumSize(new Dimension(300, 300));

        JPanel viewPort = new JPanel();
        viewPort.setLayout(new FlowLayout(FlowLayout.LEFT));

        MyContainer one = new MyContainer();
        MyContainer two = new MyContainer(true);
        viewPort.add(makeTitledPanel(one, "move it fast: NG?"));
        viewPort.add(makeTitledPanel(two, "move it fast: OK?"));
        mainWindow.add(viewPort, BorderLayout.CENTER);
        mainWindow.setVisible(true);
      }
    });
  }
  private static JComponent makeTitledPanel(JComponent c, String title) {
    JPanel p = new JPanel(new BorderLayout());
    p.setBorder(BorderFactory.createTitledBorder(title));
    p.add(c);
    return p;
  }
}

class MyContainer extends JComponent {
  JTextField text1 ;
  JTextField text2 ;
  JTextField text3 ;
  private final boolean flag;
  public MyContainer() {
    this(false);
  }
  public MyContainer(boolean flag) {
    super();
    this.flag = flag;

    super.setLayout(new FlowLayout(FlowLayout.LEFT));
    super.setPreferredSize(new Dimension(200, 50));
    super.setBorder(BorderFactory.createEmptyBorder(1, 1, 1, 1));
    super.setBackground(Color.green);

    text1 = new JTextField("LABEL_1");
    text2 = new JTextField("LABEL_2");
    text3 = new JTextField("LABEL_3");

    MouseListener l = new MouseEventConverter();
    for (JTextField f : Arrays.asList(text1, text2, text3)) {
      f.setPreferredSize(new Dimension(60, 30));
      f.setEditable(false);
      if (flag) {
        f.addMouseListener(l);
      }
      this.add(f);
    }
    this.addMouseListener(new MouseAdapter() {
      @Override
      public void mouseEntered(MouseEvent e) {
        MyContainer.this.setBorder(BorderFactory.createLineBorder(Color.BLUE));
      }
      @Override
      public void mouseExited(MouseEvent e) {
        Rectangle r = e.getComponent().getBounds();
        Point p = e.getPoint();
        if (p.x < 0 || p.y < 0 || p.x >= r.width || p.y >= r.height) {
          MyContainer.this.setBorder(BorderFactory.createEmptyBorder(1, 1, 1, 1));
        }
      }
    });
  }
}

class MouseEventConverter extends MouseAdapter {
  @Override public void mouseEntered(MouseEvent e) {
    dispatchMouseEvent(e);
  }
  @Override public void mouseExited(MouseEvent e) {
    dispatchMouseEvent(e);
  }
  private void dispatchMouseEvent(MouseEvent e) {
    Component c = e.getComponent();
    Component p = SwingUtilities.getUnwrappedParent(c);
    p.dispatchEvent(SwingUtilities.convertMouseEvent(c, e, p));
  }
}

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