Java：双击 JSlider 进行重置

发布于 2025-01-03 05:14:23 字数 1014 浏览 3 评论 0原文

我有一个 JSlider，可以设置节拍器的速度，从 40 到 200，其中 120 是默认值，位于中间。

当用户单击节拍器按钮时，节拍器将以 JSlider 上显示的速度播放 - 用户向右拖动滑块，节拍器的速度会增加，如果向左滑动，节拍器的速度会减小。

如何添加功能，以便如果用户双击 JSlider 按钮，它会默认返回到 120 - 中间？

这是我的代码：

public Metronome() {
    tempoChooser = new JSlider();
    metronomeButton = new JToggleButton();

    JLabel metText = new JLabel("Metronome:");
    add(metText);

    ...

    tempoChooser.setMaximum(200);
    tempoChooser.setMinimum(40);
    tempoChooser.addChangeListener(new javax.swing.event.ChangeListener() {
        public void stateChanged(javax.swing.event.ChangeEvent evt) {
            tempoChooserStateChanged(evt);
        }
    });
    add(tempoChooser);
    ...
    }

private void tempoChooserStateChanged(javax.swing.event.ChangeEvent evt) {
    final int tempo = tempoChooser.getValue();
    if (((JSlider) evt.getSource()).getValueIsAdjusting()) {
        setMetronomeButtonText(tempo);
    } else {
        processTempoChange(tempo);
    }
}

提前致谢！

原文

I have a JSlider that sets the speed of my metronome, from 40 - 200, where 120 is the default, in the middle.

When the user clicks the metronome button, the metronome plays at the speed displayed on the JSlider - the user drags the slider to the right, the speed of the metronome increases, and it decreases if they slide it to the left.

How do I add functionality so that if the user double-clicks on the JSlider button, it defaults back to 120 - in the middle?

Here is my code:

public Metronome() {
    tempoChooser = new JSlider();
    metronomeButton = new JToggleButton();

    JLabel metText = new JLabel("Metronome:");
    add(metText);

    ...

    tempoChooser.setMaximum(200);
    tempoChooser.setMinimum(40);
    tempoChooser.addChangeListener(new javax.swing.event.ChangeListener() {
        public void stateChanged(javax.swing.event.ChangeEvent evt) {
            tempoChooserStateChanged(evt);
        }
    });
    add(tempoChooser);
    ...
    }

private void tempoChooserStateChanged(javax.swing.event.ChangeEvent evt) {
    final int tempo = tempoChooser.getValue();
    if (((JSlider) evt.getSource()).getValueIsAdjusting()) {
        setMetronomeButtonText(tempo);
    } else {
        processTempoChange(tempo);
    }
}

thanks in advance!

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我很坚强 2025-01-10 05:14:23

这应该可以帮助您： http://docs.oracle.com/javase /tutorial/uiswing/events/mouselistener.html

您需要阅读并实现 MouseListener。您可以使用 int getClickCount() 来统计用户点击的次数，这将有助于您读取双击次数。

希望这有帮助！

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梦太阳 2025-01-10 05:14:23

尽管我没有看到问题，但我的猜测是您正在寻找 MouseListener。

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御弟哥哥 2025-01-10 05:14:23

这不是简单的工作，您必须添加 javax.swing.Timer 并监听在固定时间段内鼠标点击一次或两次，例如

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他是夢罘是命 2025-01-10 05:14:23

我最近写了一些类似的东西，这样我就可以区分单次和双次鼠标左键单击：

private Timer timer;
@Override
public void mouseClicked(MouseEvent e) {
    if(e.getButton() == MouseEvent.BUTTON1){
        if (timer == null) {
            timer = new Timer();
            timer.schedule(new TimerTask() {

                @Override
                public void run() { // timer expired before another click received, therefore = single click
                    this.cancel();
                    timer = null;
                    /* single-click actions in here */
                }

            }, (Integer) Toolkit.getDefaultToolkit().getDesktopProperty("awt.multiClickInterval"));
        }
        else { // received another click before previous click (timer) expired, therefore = double click
            timer.cancel();
            timer = null;
            /* double-click actions in here */
        }
    }
}

I recently wrote something similar so I could differentiate between single and double left mouse-button clicks:

private Timer timer;
@Override
public void mouseClicked(MouseEvent e) {
    if(e.getButton() == MouseEvent.BUTTON1){
        if (timer == null) {
            timer = new Timer();
            timer.schedule(new TimerTask() {

                @Override
                public void run() { // timer expired before another click received, therefore = single click
                    this.cancel();
                    timer = null;
                    /* single-click actions in here */
                }

            }, (Integer) Toolkit.getDefaultToolkit().getDesktopProperty("awt.multiClickInterval"));
        }
        else { // received another click before previous click (timer) expired, therefore = double click
            timer.cancel();
            timer = null;
            /* double-click actions in here */
        }
    }
}

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