哪个鼠标键是中间的？ [英] Which mouse button is the middle one?

问题描述

我目前正在开发一个Java程序，只有当用户点击左键和右键单击按钮时才能触发某个事件。

I'm currently developing a program in Java where a certain event must be triggered only when the user clicks with both the left and the right click on a button.

由于它有点不同寻常，我决定先测试一下。这是：

Since it is a little unconventional, I decided to first test this. Here it is:

import javax.swing.JFrame;
import javax.swing.JButton;
import javax.swing.JLabel;
import java.awt.event.MouseListener;
import java.awt.event.MouseEvent;

public class GUI
{
    private JFrame mainframe;
    private JButton thebutton;

    private boolean left_is_pressed;
    private boolean right_is_pressed;

    private JLabel notifier;

    public GUI ()
    {
        thebutton = new JButton ("Double Press Me");
        addListen ();
        thebutton.setBounds (20, 20, 150, 40);

        notifier = new JLabel (" ");
        notifier.setBounds (20, 100, 170, 20);

        mainframe = new JFrame ("Double Mouse Tester");
        mainframe.setDefaultCloseOperation (JFrame.DISPOSE_ON_CLOSE);
        mainframe.setResizable (false);
        mainframe.setSize (400, 250);

        mainframe.setLayout (null);

        mainframe.add (thebutton);
        mainframe.add (notifier);

        mainframe.setVisible (true);

        left_is_pressed = right_is_pressed = false;
    }

    private void addListen ()
    {
        thebutton.addMouseListener (new MouseListener ()
        {
            @Override public void mouseClicked (MouseEvent e) { }
            @Override public void mouseEntered (MouseEvent e) { }
            @Override public void mouseExited (MouseEvent e) { }

            @Override public void mousePressed (MouseEvent e)
            {
                //If left button pressed
                if (e.getButton () == MouseEvent.BUTTON1)
                {
                    //Set that it is pressed
                    left_is_pressed = true;

                    if (right_is_pressed)
                    {
                        //Write that both are pressed
                        notifier.setText ("Both pressed");
                    }

                }
                //If right button pressed
                else if (e.getButton () == MouseEvent.BUTTON3)
                {
                    //Set that it is pressed
                    right_is_pressed = true;

                    if (left_is_pressed)
                    {
                        //Write that both are pressed
                        notifier.setText ("Both pressed");
                    }
                }
            }

            @Override public void mouseReleased (MouseEvent e)
            {
                //If left button is released
                if (e.getButton () == MouseEvent.BUTTON1)
                {
                    //Set that it is not pressed
                    left_is_pressed = false;

                    //Remove notification
                    notifier.setText (" ");
                }
                //If right button is released
                else if (e.getButton () == MouseEvent.BUTTON3)
                {
                    //Set that it is not pressed
                    right_is_pressed = false;

                    //Remove notification
                    notifier.setText (" ");
                }
            }
        });
    }
}

我测试了它并且它有效，但有一个问题。

I tested it and it works, but there is a problem.

如您所见，鼠标左键由 MouseEvent.BUTTON1 和鼠标右键表示通过 MouseEvent.BUTTON3 。

As you can see, the left mouse button is represented by MouseEvent.BUTTON1 and the right mouse button by MouseEvent.BUTTON3.

如果用户的鼠标没有滚轮（显然是这样的话）鼠标仍然存在），然后在MouseEvent中只设置了两个按钮。这是否意味着右键将由 MouseEvent.BUTTON2 而不是 MouseEvent.BUTTON3 表示？如果是，我如何更改我的代码以适应这个？有什么方法可以检测到这样的东西吗？

If the user has a mouse which doesn't have a scroll wheel (apparently such mice still exist), then only two buttons are set in MouseEvent. Does that mean that the right button will be represented by MouseEvent.BUTTON2 instead of MouseEvent.BUTTON3? If yes, how can I change my code to accomodate this? Is there any way I can detect something like this?

我读了我在MouseListener接口和MouseEvent上可以找到的任何东西，但是我找不到关于这个的东西。

I read anything I could find on the MouseListener interface and on MouseEvent, but I couldn't find something about this.

推荐答案

要确定按下哪个鼠标按钮，这三个方法来自SwingUtilities 可以帮助您：

To determine which of the Mouse buttons is pressed, these three methods from SwingUtilities could help you:

1. isLeftMouseButton


2. isMiddleMouseButton


3. isRightMouseButton

1. isLeftMouseButton
2. isMiddleMouseButton
3. isRightMouseButton

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