testcolorpalette.java

由浅入深的介绍JAVAse的基本编程思想

import java.awt.*;
import java.awt.event.*;
public class TestColorPalette implements AdjustmentListener{
	private int r=255, g=255, b=255;
	private TextField tfr;
	private TextField tfg;
	private TextField tfb;
	private Scrollbar sbr;
	private Scrollbar sbg;
	private Scrollbar sbb;
	private Panel display;
	
	public static void main( String args[]) {
		new TestColorPalette().init();
	}
	
	public void init(){
		Frame frame = new Frame("调色板");
		display = new Panel();
		display.setBackground(Color.WHITE);	
			
		Panel pcolor = new Panel();
		pcolor.setLayout(new BorderLayout());		
		Panel pw = new Panel();
		pw.setLayout(new GridLayout(3,2,0,0));
		tfr = new TextField("255");
		tfg = new TextField("255");
		tfb = new TextField("255");
		tfr.setEditable(false);
		tfg.setEditable(false);
		tfb.setEditable(false);
		sbr = new Scrollbar(Scrollbar.HORIZONTAL,255,0,0,255);
		sbg = new Scrollbar(Scrollbar.HORIZONTAL,255,0,0,255);
		sbb = new Scrollbar(Scrollbar.HORIZONTAL,255,0,0,255);
		sbr.setName("SBR");
		sbg.setName("SBG");
		sbb.setName("SBB");
		sbr.setBackground(Color.RED);
		sbg.setBackground(Color.GREEN);
		sbb.setBackground(Color.BLUE);
		sbr.addAdjustmentListener(this);
		sbg.addAdjustmentListener(this);
		sbb.addAdjustmentListener(this);
		pw.add(new Label("红色:"));
		pw.add(tfr);
		pw.add(new Label("绿色:"));
		pw.add(tfg);
		pw.add(new Label("蓝色:"));
		pw.add(tfb);
	
		Panel pc = new Panel();
		pc.setLayout(new GridLayout(3,1,0,0));
		pc.add(sbr);
		pc.add(sbg);
		pc.add(sbb);		
		pcolor.add(pw,"West");
		pcolor.add(pc,"Center");
		frame.add(display,"Center");
		frame.add(pcolor,"South");
		
		frame.addWindowListener(new WindowAdapter(){
			public void windowClosing(WindowEvent e){
				System.exit(0);	
			}	
		});  
		frame.setSize(250,180);
		frame.setLocation(450,200);
		frame.setVisible( true);		
	}

	public void adjustmentValueChanged(AdjustmentEvent e){
		String sb_name = ((Scrollbar)e.getSource()).getName();
		int value = e.getValue();
		if(sb_name.equals("SBR")){
			r = value;	
			tfr.setText(Integer.toString(r));
		}else if(sb_name.equals("SBG")){
			g = value;
			tfg.setText(Integer.toString(g));
		}else if(sb_name.equals("SBB")){
			b = value;	
			tfb.setText(Integer.toString(b));
		}
		this.refresh();
	}	
	public void refresh(){
		Color c = new Color(r,g,b);
		display.setBackground(c);	
	}
}