MouseListener

Question

经过 2 小时的搜索，我真的无法找出我的代码无法正常工作的原因，所以我想知道您是否可以提供帮助。

当我按下按钮时，我只想看到 "Clicked"。我的 class MouseInput 实现 MouseListener 并且在方法 mouseClicked 中我得到的只是 system.out...("clicked");

import java.awt.Color;
import java.awt.Graphics;
import java.awt.image.BufferStrategy;

public class App implements Runnable {


    private Display display;
    private BufferStrategy bs;
    private Graphics g;


    private int cubeSide = 150;
    private String title;
    private int height,width;
    private boolean running = false;
    private Thread thread;
    private MouseInput mouseInput;



    public App(String title,int width,int height){
        this.height=height;
        this.width=width;
        this.title=title;
        display = new Display(title, width, height);
    }
    void setBufferStrategy(){
        if(display.getCanvas().getBufferStrategy()==null){
            display.getCanvas().createBufferStrategy(3);
        }
        bs = display.getCanvas().getBufferStrategy();
    }
    void init(){
        setBufferStrategy();
        mouseInput = new MouseInput();
        display.getFrame().addMouseListener(mouseInput);
    }
    public synchronized void start(){
        if(running==true)
            return;
        running=true;
        thread = new Thread(this);
        thread.start();

    }
    void render(){
    }
    @Override
    public void run() {
        init();
        while(running){
            render();
        }

    }
    public synchronized void stop(){

    }
}

鼠标输入代码:

`import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;


public class MouseInput implements MouseListener {

@Override
public void mouseClicked(MouseEvent arg0) {
    // TODO Auto-generated method stub
    System.out.println("Click");
}

@Override
public void mouseEntered(MouseEvent arg0) {
    // TODO Auto-generated method stub

}

@Override
public void mouseExited(MouseEvent arg0) {
    // TODO Auto-generated method stub

}

@Override
public void mousePressed(MouseEvent arg0) {
    // TODO Auto-generated method stub

}

@Override
public void mouseReleased(MouseEvent arg0) {
    // TODO Auto-generated method stub

}

}`

而对于显示class：

import java.awt.Canvas;
import java.awt.Color;
import java.awt.Dimension;

import javax.swing.JFrame;


public class Display {
private JFrame frame;
private Canvas canvas;
private String title;
private int width,height;


public Display(String title,int width,int height){
    this.width = width;
    this.height=height;
    this.title=title;
    CreateDisplay();
}
public void CreateDisplay(){
    frame = new JFrame(title);
    canvas = new Canvas();
    frame.setSize(width,height);
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.setVisible(true);
    frame.setFocusable(false);
    frame.setResizable(false);
    frame.setLocationRelativeTo(null);

    canvas.setPreferredSize(new Dimension(width,height));
    canvas.setMaximumSize(new Dimension(width,height));
    canvas.setMinimumSize(new Dimension(width,height));
    canvas.setBackground(Color.WHITE);
    frame.add(canvas);
    frame.pack();

}
public Canvas getCanvas(){
    return canvas;
}
public JFrame getFrame(){
    return frame;
}
}

Answer 1

我认为问题可能出在display.getFrame().addMouseListener(mouseInput)：我想display.getFrame() returns 一个class extending java.awt.Component 的实例；根据 API reference、addMouseListener

Adds the specified mouse listener to receive mouse events from this component.

我认为按钮上的事件不是 来自组件的事件 你注册了侦听器：你能尝试在 canvas 实例上注册侦听器吗而不是在框架实例上？可能是事件起源于 canvas，而不是框架...

Answer 2

首先，您可以使用内联鼠标适配器，而不是扩展鼠标侦听器并需要单独的鼠标代码文件。

其次，如果您想观察按钮上的点击，请将侦听器添加到您的按钮。

    yourJButton.addMouseListener( new MouseAdapter()
    {
        @Override
        public void mouseClicked( MouseEvent e )
        {
            {
                 //do stuff
            }
        }
    });

MouseListener - MouseClicked

MouseListener - MouseClicked

java