JSlider旋钮不更新(基本Java)

时间:2012-12-22 18:38:36

标签: java swing jslider

我在Java中实现了一个简单的水平JSlider。没有刻度线或类似的东西。可能就像人类可以想象的一样简单。

当我试图通过用鼠标拖动来“左移”JSlider时,其数值更新(我设置了一个system.out打印语句来报告滑块的改变价值,看起来很好。

但是,滑块旋钮本身不会移动。它只是在初始化期间保持卡住状态。是否存在某种类似于“每个JSlider应该具有的”样板代码?

我一直在玩“ChangeListener”的东西,但我一直在努力。

1 个答案:

答案 0 :(得分:2)

似乎对我有用,请发布SSCCE以显示具体问题:

enter image description here

import java.awt.BorderLayout;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JSlider;
import javax.swing.SwingUtilities;
import javax.swing.UIManager;
import javax.swing.UIManager.LookAndFeelInfo;
import javax.swing.event.ChangeEvent;
import javax.swing.event.ChangeListener;

public class SwingSliderExample extends JPanel {

    public SwingSliderExample() {

        super(true);
        this.setLayout(new BorderLayout());
        final JSlider slider = new JSlider(JSlider.HORIZONTAL, 0, 50, 25);

        slider.setMinorTickSpacing(2);
        slider.setMajorTickSpacing(10);
        slider.setPaintTicks(true);
        slider.setPaintLabels(true);

        // We'll just use the standard numeric labels for now...
        slider.setLabelTable(slider.createStandardLabels(10));

        slider.addChangeListener(new ChangeListener() {
            @Override
            public void stateChanged(ChangeEvent ce) {
                if (!slider.getValueIsAdjusting()) {//no adjustments are taking place thus we know the value is final
                    System.out.println(slider.getValue());
                }
            }
        });

        add(slider, BorderLayout.CENTER);
    }

    public static void main(String s[]) {
        SwingUtilities.invokeLater(new Runnable() {
            @Override
            public void run() {
                try {
                    for (LookAndFeelInfo info : UIManager.getInstalledLookAndFeels()) {
                        if ("Nimbus".equals(info.getName())) {
                            UIManager.setLookAndFeel(info.getClassName());
                            break;
                        }
                    }
                } catch (Exception e) {
                    // If Nimbus is not available, you can set the GUI to another look and feel.
                }
                JFrame frame = new JFrame("Slider Example");
                frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                frame.add(new SwingSliderExample());
                frame.pack();
                frame.setVisible(true);
            }
        });
    }
}

<强>参考: