JScrollBar

    接到了GUI相关的task,从来没看Java的我只好各种百度加看书了。这里介绍了 JScrollBar 的简单应用。    话不多说,直接上代码和效果图。

 1 import java.awt.*;  
 2 import java.awt.event.*;  
 3 import javax.swing.*;
 4 
 5 public class JScrollBarExample implements AdjustmentListener
 6 {
 7     JPanel jPanel = new JPanel();
 8     /* 
 9     * 产生一个垂直滚动轴,默认滚动轴位置在10刻度的地方,extent值设10,minimum值为0, maximan值为100,因此滚动轴一开始在刻度10的位置上,
* 可滚动的区域大小为100-10-0=90刻度,滚动范围在0~90中。
10 */ 11 JScrollBar scrollBarVerticalDirection = new JScrollBar(JScrollBar.VERTICAL, 10, 10, 0, 100); 12 JScrollBar scrollBarHorizontalDirection = new JScrollBar(); 13 JLabel jLable = new JLabel("刻度:", JLabel.CENTER); 14 JLabel jLableForResult = new JLabel("Result:", JLabel.CENTER); 15 JFrame jFrame = new JFrame("JScrollBarDemo"); 16 JLabel label1 = new JLabel(new ImageIcon(".\icons\flower.jpg")); 17 18 public JScrollBarExample() 19 { 20 jbInit(); 21 } 22 23 private void jbInit() 24 { 25 Container contentPane = jFrame.getContentPane(); 26 jPanel.add(jLable); 27 // 设置拖曳滚动轴时,滚动轴刻度一次的变化量。 28 scrollBarVerticalDirection.setUnitIncrement(1); 29 // 设置当鼠标在滚动轴列上按一下是,滚动轴一次所跳的区块大小 30 scrollBarVerticalDirection.setBlockIncrement(10); 31 scrollBarVerticalDirection.addAdjustmentListener(this); 32 33 contentPane.add(jPanel, BorderLayout.CENTER); 34 contentPane.add(scrollBarVerticalDirection, BorderLayout.EAST); 35 contentPane.add(jLable, BorderLayout.NORTH); 36 //contentPane.add(jLableForResult, BorderLayout.NORTH); 37 38 jFrame.setSize(new Dimension(200, 200)); 39 jFrame.setVisible(true); 40 jFrame.addWindowListener(new WindowAdapter() { 41 public void windowClosing(WindowEvent e) { 42 System.exit(0); 43 } 44 }); 45 } 46 47 public void adjustmentValueChanged(AdjustmentEvent e) { 48 if ((JScrollBar) e.getSource() == scrollBarVerticalDirection) 49 { 50 jLable.setText("垂直刻度" + e.getValue()); 51 if(e.getValue() >= 90) 52 { 53 //jLableForResult.setText("XXXX"); 54 System.out.println("XXXXXXXXXXXXXX "); 55 } 56 } 57 } 58 59 public static void main(String[] args) 60 { 61 new JScrollBarExample(); 62 } 63 }

效果图:
JScrollBar

参考资料:

erbo2008.iteye.com/blog/834862

http://download.oracle.com/technetwork/java/javase/6/docs/zh/api/javax/swing/JScrollBar.html#JScrollBar(int,%20int,%20int,%20int,%20int)