区分Java中的单击和双击 [英] Distinguish between a single click and a double click in Java

问题描述

我搜索论坛并查看此代码：

I search the forum and see this codes:

            public void mouseClicked(MouseEvent e) {
            if (e.getClickCount() == 2) {
                System.out.println("  and it's a double click!");
                wasDoubleClick = true;
            } else {
                Integer timerinterval = (Integer) Toolkit.getDefaultToolkit().getDesktopProperty(
                        "awt.multiClickInterval");
                timer = new Timer(timerinterval.intValue(), new ActionListener() {

                    public void actionPerformed(ActionEvent evt) {
                        if (wasDoubleClick) {
                            wasDoubleClick = false; // reset flag
                        } else {
                            System.out.println("  and it's a simple click!");
                        }
                    }
                });
                timer.setRepeats(false);

                timer.start();
            }

        }

但代码运行不正确（有时候）它打印出来只需点击一下！2次。它应该打印出来并且它是双击！）。任何人都可以告诉我为什么吗？或者你能给我一些更好的方法吗？
谢谢！

but the code runs incorrectly(Sometime it prints out " and it's a single click!" 2 times . It should print out " and it's a double click!"). Can anybody show me why? or can you give me some better ways to do this? Thank you!

推荐答案

有时打印出来只需点击一下！ 2次 。它应该打印出来并且它是双击！）。

Sometime it prints out " and it's a single click!" 2 times . It should print out " and it's a double click!").

这是正常现象。如果在指定的时间间隔内单击两次，则仅发生双击。因此，有时如果你没有足够快地点击，你将连续两次点击。

That is normal. A double click only happens if you click twice within the specified time interval. So sometimes if you don't click fast enough you will get two single clicks in a row.

Integer timerinterval = (Integer) Toolkit.getDefaultToolkit().getDesktopProperty("awt.multiClickInterval"); 

以上代码行决定了双击必须达到的速度。

The above line of code determines how fast the double click must be.

这里的价值是我用过的一些代码做同样的事情。不知道它是否比你的代码更好或更差：

For what its worth here is some code I have used to do the same thing. Don't know if its any better or worse than the code you have:

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

public class ClickListener extends MouseAdapter implements ActionListener
{
    private final static int clickInterval = (Integer)Toolkit.getDefaultToolkit().
        getDesktopProperty("awt.multiClickInterval");

    MouseEvent lastEvent;
    Timer timer;

    public ClickListener()
    {
        this(clickInterval);
    }

    public ClickListener(int delay)
    {
        timer = new Timer( delay, this);
    }

    public void mouseClicked (MouseEvent e)
    {
        if (e.getClickCount() > 2) return;

        lastEvent = e;

        if (timer.isRunning())
        {
            timer.stop();
            doubleClick( lastEvent );
        }
        else
        {
            timer.restart();
        }
    }

    public void actionPerformed(ActionEvent e)
    {
        timer.stop();
        singleClick( lastEvent );
    }

    public void singleClick(MouseEvent e) {}
    public void doubleClick(MouseEvent e) {}

    public static void main(String[] args)
    {
        JFrame frame = new JFrame( "Double Click Test" );
        frame.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );
        frame.addMouseListener( new ClickListener()
        {
            public void singleClick(MouseEvent e)
            {
                System.out.println("single");
            }

            public void doubleClick(MouseEvent e)
            {
                System.out.println("double");
            }
        });
        frame.setSize(200, 200);
        frame.setVisible(true);
     }
}

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