scoll.java~2~

很好得jbuilder100例源代码

package sco;

import java.awt.*;
import java.awt.event.*;
import java.applet.*;
import javax.swing.*;
import com.borland.jbcl.layout.*;

public class scoll extends Applet {
  int v1,v2,v3;
  Color c1,c2,c3,c4;
  boolean isStandalone = false;
  JLabel r = new JLabel();
  JLabel g = new JLabel();
  JLabel b = new JLabel();
  XYLayout xYLayout1 = new XYLayout();
  JScrollBar sb1 = new JScrollBar();
  JScrollBar sb2 = new JScrollBar();
  JScrollBar sb3 = new JScrollBar();
  /**Get a parameter value*/
  public String getParameter(String key, String def) {
    return isStandalone ? System.getProperty(key, def) :
      (getParameter(key) != null ? getParameter(key) : def);
  }

  /**Construct the applet*/
  public scoll() {
  }
  /**Initialize the applet*/
  public void init() {
    try {
      jbInit();
    }
    catch(Exception e) {
      e.printStackTrace();
    }
  }
  /**Component initialization*/
  private void jbInit() throws Exception {
    r.setOpaque(true);
    r.setText("R:100");
    g.setOpaque(true);
    g.setText("G:100");
    b.setOpaque(true);
    b.setText("B:100");
    this.setLayout(xYLayout1);
    sb1.setMaximum(265);
    sb1.setOrientation(JScrollBar.HORIZONTAL);
    sb1.setValue(100);
    sb1.setRequestFocusEnabled(true);
    sb1.addAdjustmentListener(new java.awt.event.AdjustmentListener() {
      public void adjustmentValueChanged(AdjustmentEvent e) {
        sb1_adjustmentValueChanged(e);
      }
    });
    sb2.setMaximum(265);
    sb2.setOrientation(JScrollBar.HORIZONTAL);
    sb2.setValue(100);
    sb2.setRequestFocusEnabled(true);
    sb2.addAdjustmentListener(new java.awt.event.AdjustmentListener() {
      public void adjustmentValueChanged(AdjustmentEvent e) {
        sb2_adjustmentValueChanged(e);
      }
    });
    sb3.setMaximum(265);
    sb3.setOrientation(JScrollBar.HORIZONTAL);
    sb3.setValue(100);
    sb3.setRequestFocusEnabled(true);
    sb3.addAdjustmentListener(new java.awt.event.AdjustmentListener() {
      public void adjustmentValueChanged(AdjustmentEvent e) {
        sb3_adjustmentValueChanged(e);
      }
    });
    this.add(r,   new XYConstraints(10, 16, -1, -1));
    this.add(g,   new XYConstraints(10, 40, -1, -1));
    this.add(b,   new XYConstraints(10, 64, -1, -1));
    this.add(sb1,  new XYConstraints(60, 16, 200, -1));
    this.add(sb2,   new XYConstraints(60, 40, 200, -1));
    this.add(sb3,   new XYConstraints(60, 64, 200, -1));
  }
  /**Get Applet information*/
  public String getAppletInfo() {
    return "Applet Information";
  }
  /**Get parameter info*/
  public String[][] getParameterInfo() {
    return null;
  }

  void sb1_adjustmentValueChanged(AdjustmentEvent e) {
     v1=e.getValue();
     sb1.setValue(v1);
     r.setText("R:"+String.valueOf(v1));
     repaint();
  }

  void sb2_adjustmentValueChanged(AdjustmentEvent e) {
     v2=e.getValue();
     sb2.setValue(v2);
     g.setText("G:"+String.valueOf(v2));
     repaint();
  }

  void sb3_adjustmentValueChanged(AdjustmentEvent e) {
     v3=e.getValue();
     sb3.setValue(v3);
     b.setText("B:"+String.valueOf(v3));
     repaint();
  }
  public void paint(Graphics g){
     c1=new Color(v1,0,0);
     g.setColor(c1);
     g.fillRect(10,130,50,50);
     c2=new Color(0,v2,0);
     g.setColor(c2);
     g.fillRect(80,130,50,50);
     c3=new Color(0,0,v3);
     g.setColor(c3);
     g.fillRect(150,130,50,50);
     c4=new Color(v1,v2,v3);
     g.setColor(c4);
     g.fillRect(10,200,190,50);
  }
  public void update(Graphics g){
     paint(g);
  }
}