swingcolortext.java

Java 程序的退出事件

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

public class swingcolortext extends JFrame
{
  swingcolortext rgbcontrol,hsbcontrol;
  JPanel swatch;
  public swingcolortext()
  {
    super("coler text");
    JPanel pane=new JPanel();
    pane.setLayout(new GridLayout(1,3,5,15));
    swatch=new JPanel();
    swatch.setBackground(Color.black);
    String[] rgblabels={"Red","Green","Blue"};
    rgbcontrol=new SwingColorControls(this,rgblabels);
    String [] hsblabels={"hue","saturation","brightness"};
    hsbcontrol=new SwingColorControls(this,hsblabels);
    pane.add(swatch);
    pane.add(rgbcontrol);
    pane.add(hsbcontrol);
  
    setContentPane(pane);
  }
 

  public static void main(String[] args)
  {
    JFrame frame=new swingcolortext();
    frame.addWindowListener(new quitEvent());
    frame.pack();
    frame.setVisible(true);
   }
   public Inserts getInsets()
   {
     return new Inserts(10,10,10,10);
   }
   
   void updata(SwingColorControls control)
   {
      Color c;   // get values
      int[] value=new int[3];
      for (int i=0;i<3;i++)
      {
         value[i]=Integer.parseInt(control.tfield[i].getText());
        if((value[i]<0)||(value[i]>255))
         {
            value[i]=0;
            control.tfield[i].setText(""+value[i]);
          }
      }
      if (control==rgbcontrol)
      {   c=new Color(value[0],value[1],value[2]);
          float[] HSB=Color.RGBtoHSB(value[0],value[1],value[2],(new float[3]));
          HSB[0]*=360;
          HSB[1]*=100;
          HSB[2]*=100;
  
       for(int i=0;i<3;i++)
       {
          hsbcontrol.tfield[i].setText(String.valueOf((int)HSB[i]));
       }
      }
      else
       {
          c=Color.getHSBColor((float)value[0]/360,(float)value[1]/100,(float)value[2]/100);
      
     rgbcontrol.tfield[0].setText(String.valueOf(c.getRed()));
     rgbcontrol.tfield[1].setText(String.valueOf(c.getGreen()));
     rgbcontrol.tfield[2].setText(String.valueOf(c.getBlue()));
       }

       swatch.setBackground(c);
       swatch.repaint();
   }
  }

 





 class SwingColorControls extends JPanel implements ActionListener, FocusListener
  {
     swingcolortext frame;
     JTextField[] tfield =new JTextField[3];
 
     SwingColorControls(swingcolortext parent,String[] label)
     {
       frame=parent;
       setLayout(new GridLayout(3,2,10,10));
       for(int i=0;i<3;i++)
      {
        tfield[i]=new JTextField("0");
        tfield[i].addFocusListener(this);
        tfield[i].addActionListener(this);
        add(new JLabel(label[i],JLabel.RIGHT));
        add(tfield[i]);
      }
     }
  
  public Insets getInsets()
  {  return new Insets(10,10,0,0);
  }

  public void actionPerformed(ActionEvent evt)
  {
    if (evt.getSource() instanceof JTextField)
       frame.updata(this);
  }
public void focusLost(FocusEvent evt)
 {
   frame.updata(this);
  }
public void focusGained(FocusEvent evt) {}
}