Swing JScrollBar類

JScrollBar類是滾動條的實現。

類聲明

以下是javax.swing.JScrollBar類的聲明 -

public class JScrollBar
   extends JComponent
      implements Adjustable, Accessible

字段

以下是javax.swing.ImageIcon類的字段 -

• protected int blockIncrement
• protected BoundedRangeModel model - 表示滾動條的最小值，最大值，範圍(又名“visibleAmount”)和當前值的模型。
• protected int orientation
• protected int unitIncrement

類構造函數

類方法

方法繼承

該類繼承以下類中的方法 -

• java.lang.Object

JScrollBar示例

使用編輯器創建以下Java程式 -

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

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

   public JScrollBarExample(){
      prepareGUI();
   }
   public static void main(String[] args){
       JScrollBarExample  swingControlDemo = new JScrollBarExample();
      swingControlDemo.showScrollbarDemo();
   }
   private void prepareGUI(){
      mainFrame = new JFrame("Java Swing JScrollBar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 showScrollbarDemo() {
      headerLabel.setText("Control in action: JScrollbar");

      final JScrollBar horizontalScroller = new JScrollBar(JScrollBar.HORIZONTAL);
      final JScrollBar verticalScroller = new JScrollBar();
      verticalScroller.setOrientation(JScrollBar.VERTICAL);
      horizontalScroller.setMaximum (100);
      horizontalScroller.setMinimum (1);
      verticalScroller.setMaximum (100);
      verticalScroller.setMinimum (1);

      horizontalScroller.addAdjustmentListener(new AdjustmentListener() {
         @Override
         public void adjustmentValueChanged(AdjustmentEvent e) {
            statusLabel.setText("水準: "
               +horizontalScroller.getValue()
               +" , 垂直: "
               + verticalScroller.getValue());
            }
      });
      verticalScroller.addAdjustmentListener(new AdjustmentListener() {
         @Override
         public void adjustmentValueChanged(AdjustmentEvent e) {
            statusLabel.setText("水準: "
               +horizontalScroller.getValue()
               +" , 垂直: "+ verticalScroller.getValue());
         }
      });
      controlPanel.add(horizontalScroller);
      controlPanel.add(verticalScroller);

      mainFrame.setVisible(true);
   }
}

執行上面示例代碼，得到以下結果：