|
Displaying Source Code(s)
|
|
set the foreground and background color to the text area
--------------------------------------------------------------------------------
Description : this program demonstrates the awt chechbox control
and the layouts
import java.awt.*;
import java.awt.event.*;
import java.applet.*;
class colopat extends Frame
{
Checkbox r,g,b;
Checkbox m,y,gr,p,w,bl,c;
TextArea ta;
Checkbox r1,g1,b1;
Checkbox m1,y1,gr1,p1,w1,bl1,c1;
Label ba,fo;
Panel pa1,p2,p3;
colopat()
{
setSize(800,600);
setLayout(new BorderLayout());
pa1=new Panel(new GridLayout(5,2,10,10));
p2=new Panel(new GridLayout(5,2,10,10));
CheckboxGroup cbg=new CheckboxGroup();
r=new Checkbox("red",cbg,false);
g=new Checkbox("green",cbg,false);
b=new Checkbox("blue",cbg,false);
m=new Checkbox("megenta",cbg,false);
y=new Checkbox("yellow",cbg,false);
gr=new Checkbox("grey",cbg,false);
p=new Checkbox("pink",cbg,false);
w=new Checkbox("white",cbg,false);
bl=new Checkbox("black",cbg,true);
c=new Checkbox("cyan",cbg,false);
ba=new Label("BACKGROUND COLORS",Label.CENTER);
ba.setBackground(Color.pink);
pa1.add(ba);
pa1.add(r);
pa1.add(b);
pa1.add(m);
pa1.add(y);
pa1.add(gr);
pa1.add(p);
pa1.add(w);
pa1.add(bl);
pa1.add(c);
add("West",pa1);
ta=new TextArea(5,25);
p3=new Panel(new GridLayout(3,1));
p3.add(new Label("Text Area",1));
p3.add(ta);
add("Center",p3);
r.addItemListener(new CheckBoxHandler(this));
g.addItemListener(new CheckBoxHandler(this));
b.addItemListener(new CheckBoxHandler(this));
m.addItemListener(new CheckBoxHandler(this));
y.addItemListener(new CheckBoxHandler(this));
gr.addItemListener(new CheckBoxHandler(this));
p.addItemListener(new CheckBoxHandler(this));
w.addItemListener(new CheckBoxHandler(this));
c.addItemListener(new CheckBoxHandler(this));
bl.addItemListener(new CheckBoxHandler(this));
CheckboxGroup cbg1=new CheckboxGroup();
r1=new Checkbox("red",cbg1,false);
g1=new Checkbox("green",cbg1,false);
b1=new Checkbox("blue",cbg1,false);
m1=new Checkbox("megenta",cbg1,false);
y1=new Checkbox("yellow",cbg1,false);
gr1=new Checkbox("grey",cbg1,false);
p1=new Checkbox("pink",cbg1,false);
w1=new Checkbox("white",cbg1,false);
bl1=new Checkbox("black",cbg1,true);
c1=new Checkbox("cyan",cbg1,false);
fo=new Label("FOREGROUND COLORS");
fo.setBackground(Color.pink);
p2.add(fo);
p2.add(c1);
p2.add(g1);
p2.add(b1);
p2.add(m1);
p2.add(y1);
p2.add(gr1);
p2.add(p1);
p2.add(w1);
p2.add(bl1);
p2.add(c1);
add("East",p2);
r1.addItemListener(new CheckBoxHandler(this));
g1.addItemListener(new CheckBoxHandler(this));
b1.addItemListener(new CheckBoxHandler(this));
m1.addItemListener(new CheckBoxHandler(this));
y1.addItemListener(new CheckBoxHandler(this));
gr1.addItemListener(new CheckBoxHandler(this));
p1.addItemListener(new CheckBoxHandler(this));
w1.addItemListener(new CheckBoxHandler(this));
c1.addItemListener(new CheckBoxHandler(this));
bl1.addItemListener(new CheckBoxHandler(this));
c1.addItemListener(new CheckBoxHandler(this));
addWindowListener(new mywindowAdapter(this));
setVisible(true);
}
public static void main(String args[])
{
new colopat();
}
}
class CheckBoxHandler implements ItemListener
{
colopat cp;
CheckBoxHandler(colopat cp)
{
this.cp=cp;
}
public void itemStateChanged(ItemEvent ie)
{
if(cp.r.getState())
cp.ta.setBackground(Color.red);
else if(cp.g.getState())
cp.ta.setBackground(Color.green);
else if(cp.b.getState())
cp.ta.setBackground(Color.blue);
else if(cp.m.getState())
cp.ta.setBackground(Color.magenta);
else if(cp.y.getState())
cp.ta.setBackground(Color.yellow);
else if(cp.gr.getState())
cp.ta.setBackground(Color.lightGray);
else if(cp.bl.getState())
cp.ta.setBackground(Color.black);
else if(cp.w.getState())
cp.ta.setBackground(Color.white);
else if(cp.p.getState())
cp.ta.setBackground(Color.pink);
else
cp.ta.setBackground(Color.cyan);
if(cp.r1.getState())
cp.ta.setForeground(Color.red);
else if(cp.g1.getState())
cp.ta.setForeground(Color.green);
else if(cp.b1.getState())
cp.ta.setForeground(Color.blue);
else if(cp.m1.getState())
cp.ta.setForeground(Color.magenta);
else if(cp.y1.getState())
cp.ta.setForeground(Color.yellow);
else if(cp.gr1.getState())
cp.ta.setForeground(Color.lightGray);
else if(cp.bl1.getState())
cp.ta.setForeground(Color.black);
else if(cp.w1.getState())
cp.ta.setForeground(Color.white);
else if(cp.p1.getState())
cp.ta.setForeground(Color.pink);
else
cp.ta.setForeground(Color.cyan);
}
}
class mywindowAdapter extends WindowAdapter
{
colopat cp;
mywindowAdapter(colopat cp)
{
this.cp=cp;
}
public void windowClosing(WindowEvent e)
{
System.exit(0);
}
} |
|
|
123
Eng