如何在Swing中创建带有自定义标签的滑动条

说明

以下示例展示了如何在Swing中创建带有自定义标签的滑动条。

我们正在使用以下 API。

• JSlider(orientation, min, max, value) ： 在方向设置垂直方向时创建滑动条。

• JSlider.getValue() ： 获取滑动条的当前值。

• JSlider.setLabelTable() ： 设置标签。

• JSlider.setPaintLabels(true) ： 显示标签。

代码示例

package com.yiidian;

import javax.swing.*;
import javax.swing.event.ChangeEvent;
import javax.swing.event.ChangeListener;
import java.awt.*;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.util.Hashtable;

public class SwingControlDemo {
   private JFrame mainFrame;
   private JLabel headerLabel;
   private JLabel statusLabel;
   private JPanel controlPanel;

   public SwingControlDemo(){
      prepareGUI();
   }
   public static void main(String[] args){
      SwingControlDemo  swingControlDemo = new SwingControlDemo();      
      swingControlDemo.showSliderDemo();
   }
   private void prepareGUI(){
      mainFrame = new JFrame("一点教程网：Java Swing Examples");
      mainFrame.setSize(400,400);
      mainFrame.setLayout(new GridLayout(3, 1));
      
      mainFrame.addWindowListener(new WindowAdapter() {
         public void windowClosing(WindowEvent windowEvent){
            System.exit(0);
         }        
      });    
      headerLabel = new JLabel("", JLabel.CENTER);        
      statusLabel = new JLabel("",JLabel.CENTER);    
      statusLabel.setSize(350,100);

      controlPanel = new JPanel();
      controlPanel.setLayout(new FlowLayout());

      mainFrame.add(headerLabel);
      mainFrame.add(controlPanel);
      mainFrame.add(statusLabel);
      mainFrame.setVisible(true);  
   }
   private void showSliderDemo(){
      headerLabel.setText("Control in action: JSlider"); 
      JSlider slider = new JSlider(JSlider.HORIZONTAL,0,100,10);
      Hashtable<Integer, JLabel> labelTable =
      new Hashtable<Integer, JLabel>();
      labelTable.put(new Integer( 0 ),
      new JLabel("Stop") );
      labelTable.put(new Integer( 50 ),
      new JLabel("Slow") );
      labelTable.put(new Integer( 100 ),
      new JLabel("Fast") );
      slider.setLabelTable(labelTable);
      slider.setPaintLabels(true); 
      slider.addChangeListener(new ChangeListener() {
         public void stateChanged(ChangeEvent e) {
            statusLabel.setText("Value : " + ((JSlider)e.getSource()).getValue());
         }
      });
      controlPanel.add(slider);      
      mainFrame.setVisible(true);     
   } 
}

执行效果如下：