jcolorchoosertest.java

详细讲解了java的基础知识

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

public class JColorChooserTest extends JApplet  {

  JPanel jPanel1 = new JPanel();
  JPanel jPanel2 = new JPanel();
  JPanel jPanel3 = new JPanel();
  JPanel jPanel4 = new JPanel();
  Canvas jPanel5 = new Canvas();//绘图版	
  JButton jButton1 = new JButton();
  JButton jButton2 = new JButton();
  JButton jButton3 = new JButton();
  JButton jButton4 = new JButton();

  JLabel jLabel1 = new JLabel();
  JTextField jTextField1 = new JTextField();
  JLabel jLabel3= new JLabel();	
   GridLayout gridLayout1 = new GridLayout();
  BorderLayout borderLayout1 = new BorderLayout(10,10);	
 JColorChooser colorChooser = new JColorChooser();
 Color selectedColor;
 int mode=0;
  
  public void init() {
    try  {
     myInit();
    }
    catch(Exception e)  {
      e.printStackTrace();
    }
  }

  
  private void myInit() throws Exception {
    this.setSize(new Dimension(350, 300));
    this.getContentPane().setLayout(new BorderLayout(10,10));
     jButton1=new JButton(new ImageIcon("Line.gif"));
     jButton2=new JButton(new ImageIcon("Circle.gif"));
     jButton3=new JButton(new ImageIcon("Square.gif"));
     jButton4=new JButton(new ImageIcon("ColorPanel.gif"));
   
    jLabel1.setText("目前颜色：");
    jTextField1.setPreferredSize(new Dimension(250, 25));
   jTextField1.setText("Null");
	
    gridLayout1.setColumns(1);
    gridLayout1.setHgap(5);
    gridLayout1.setRows(4);
    gridLayout1.setVgap(5);
	    
    jPanel1.setLayout(gridLayout1);
    jPanel1.add(jButton1, null);
    jPanel1.add(jButton2, null);
    jPanel1.add(jButton3, null);
    jPanel1.add(jButton4, null);
    this.getContentPane().add(jPanel1, BorderLayout.WEST);

    jPanel2.setLayout(new FlowLayout());
    jPanel2.add(jLabel1, null);
    jPanel2.add(jTextField1, null);
    this.getContentPane().add(jPanel2, BorderLayout.SOUTH);
		
    jPanel3.setLayout(borderLayout1);
    this.getContentPane().add(jPanel3, BorderLayout.CENTER);
    jPanel5.setBackground(Color.white);
    JScrollPane jsp=new JScrollPane(jPanel5);//制作一scrollpane以承装 绘图版
    jPanel3.add(jsp, BorderLayout.CENTER);
    JLabel jLabel3=new JLabel("绘图区");
    jPanel4.add(jLabel3);
    jPanel3.add(jPanel4, BorderLayout.NORTH);

    jButton1.addMouseListener(new ButtonMouseListener(this));
    jButton2.addMouseListener(new ButtonMouseListener(this));   
    jButton3.addMouseListener(new ButtonMouseListener(this)); 
    jButton4.addMouseListener(new ButtonMouseListener(this));
    
  }


class ButtonMouseListener implements MouseListener {
	
  	public JColorChooserTest japplet=new JColorChooserTest() ;		
 	public ButtonMouseListener(JColorChooserTest japplet1){
	this.japplet=japplet1;
	}

    public void mouseEntered(MouseEvent event) {
     
    }
    public void mouseExited(MouseEvent event) {
	        
    }
  
     public void mousePressed(MouseEvent event) {
	JButton source=(JButton)event.getSource();
	 if (source==jButton4){
		selectedColor = JColorChooser.showDialog(
			jButton4,  // parent comp
			"请选择您喜欢的颜色",   // dialog title
			getBackground()); // initial color

	if(selectedColor == null) {
		JOptionPane.showMessageDialog(colorChooser,
						"您取消色版的选择了！");
	}
	else {
	
		repaint();
		japplet.jTextField1.setText(selectedColor.toString());
		japplet.jTextField1.setBackground(selectedColor);
		JOptionPane.showMessageDialog(colorChooser,
		"您所选的颜色：" + selectedColor);
	}
        }
      }
	
   	 public void mouseClicked (MouseEvent event) {
     		JButton source=(JButton)event.getSource(); 
		if (source==jButton1){
			mode=1;
			jPanel5.repaint();
		}
		if (source==jButton2){
			mode=2;
			jPanel5.repaint();
		}
		if (source==jButton3){
			mode=3;
			jPanel5.repaint();
		}
 	}
	public void mouseReleased(MouseEvent event) {     
 	}
	
}
class Canvas extends JPanel {
	public void paintComponent(Graphics g) {
		super.paintComponent(g);
		Dimension size = getSize();
		g.setColor(selectedColor);
		if (mode==1){		
		g.drawLine(40,40,size.width,size.height);
		}
		if (mode==2){		
		g.drawOval(30,50,50,30);
		}
		if (mode==3){		
		g.drawRect(40,40,150,50);
		}
	}
	
    }
}