下面的示例展示了如何在Java Swing应用程序中使用带有自定义标签的滑块。
使用以下API -
JSlider(orientation, min, max, value)- 在方向设置垂直方向时创建滑块。JSlider.getValue()- 获取滑块的当前值。JSlider.setLabelTable()- 设置标签。JSlider.setPaintLabels(true)- 显示标签。
示例
package com.yiibai.swingdemo;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
import java.util.Hashtable;
public class SwingTester {
private JFrame mainFrame;
private JLabel headerLabel;
private JLabel statusLabel;
private JPanel controlPanel;
public SwingTester() {
prepareGUI();
}
public static void main(String[] args) {
SwingTester swingControlDemo = new SwingTester();
swingControlDemo.showSliderDemo();
}
private void prepareGUI() {
mainFrame = new JFrame("Swing带自定义标签滑块示例");
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("停止"));
labelTable.put(new Integer(50), new JLabel("较慢"));
labelTable.put(new Integer(100), new JLabel("较快"));
slider.setLabelTable(labelTable);
slider.setPaintLabels(true);
slider.addChangeListener(new ChangeListener() {
public void stateChanged(ChangeEvent e) {
statusLabel.setText("当前值 : " + ((JSlider) e.getSource()).getValue());
}
});
controlPanel.add(slider);
mainFrame.setVisible(true);
}
}
执行上面示例代码，得到以下结果：
