jslidertest.java

编程之道--java程序设计入门源代码

/**
 *　滑块的测试
 */
import java.awt.Container;
import java.awt.BorderLayout;
import java.awt.Font;
import javax.swing.JSlider;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JLabel;
import javax.swing.JComboBox;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import javax.swing.event.ChangeListener;
import javax.swing.event.ChangeEvent;
import java.util.Vector;

public class JSliderTest
{
	public static void main(String[] args)
	{
		JSliderFrame frame = new JSliderFrame();
		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		frame.show();
	}
}

class JSliderFrame extends JFrame
{
	private static final int WIDTH = 400;
	private static final int HEIGHT = 300;
	private JLabel textLabel;
	private JComboBox combox;
	private JSlider slider;
	
	public JSliderFrame()
	{
		setSize(WIDTH, HEIGHT);		
		setTitle("滑块测试");
		
		Container con = getContentPane();
		
		textLabel = new JLabel("this is the text font.");
		textLabel.setFont(new Font("serif", Font.PLAIN, 20));
		
		Vector selectItem = new Vector();
		selectItem.add("Serif");
		selectItem.add("SansSerif");
		selectItem.add("DialogInput");
		combox = new JComboBox(selectItem);
		
		JPanel controlPanel = new JPanel();
		controlPanel.add(new JLabel("字体:"));
		controlPanel.add(combox);
		controlPanel.add(new JLabel("字号:"));
		
		slider = new JSlider(0, 40);
		slider.setPaintLabels(true);
		slider.setPaintTicks(true);
		slider.setSnapToTicks(true);
		slider.setMajorTickSpacing(5);
		slider.setMinorTickSpacing(1);
		controlPanel.add(slider);
		combox.addActionListener(new ActionListener()
			{
				public void actionPerformed(ActionEvent e)
				{
					String newFont = (String)combox.getSelectedItem();
					int number = slider.getValue();
					textLabel.setFont(new Font(newFont, Font.PLAIN, number));
				}
			});
		
		slider.addChangeListener(new ChangeListener()
			{
				public void stateChanged(ChangeEvent event)
				{
					String newFont = (String)combox.getSelectedItem();
					int number = slider.getValue();
					textLabel.setFont(new Font(newFont, Font.PLAIN, number));
				}
			});
		
		con.add(controlPanel, BorderLayout.SOUTH);
		con.add(textLabel, BorderLayout.CENTER);
	}
}