The following example illustrates use of ComponentEvent with AWT Button
ButtonComponentEvent(): Code illustrating ComponentListener with AWT Button is written here.
new ButtonComponentEvent(): Create object for the class ButtonComponentEvent
import java.awt.*;
import java.awt.event.*;
class ButtonComponentEvent extends Frame implements ComponentListener
{
Button main;
Button resize,show,move;
public ButtonComponentEvent()
{
createAndShowGUI();
}
private void createAndShowGUI()
{
setTitle("ComponentEvent on Button");
setLayout(new FlowLayout());
// Create buttons
main=new Button("Main Button");
resize=new Button("Increase size");
show=new Button("Show/Hide");
move=new Button("Move down");
// Add ActionListener to buttons
resize.addActionListener(new ResizeListener());
show.addActionListener(new ShowListener());
move.addActionListener(new MoveListener());
// Add ComponentListener to main button
main.addComponentListener(this);
// Add all buttons
add(main);
add(resize);
add(show);
add(move);
setSize(400,400);
setVisible(true);
}
// For any ComponentEvent, just update the title
public void componentResized(ComponentEvent ce)
{
setTitle("Resized to ["+main.getWidth()+","+main.getHeight()+"]");
}
public void componentMoved(ComponentEvent ce)
{
setTitle("Moved to ["+main.getX()+","+main.getY()+"]");
}
public void componentShown(ComponentEvent ce)
{
setTitle("Button is visible");
}
public void componentHidden(ComponentEvent ce)
{
setTitle("Button is hidden");
}
public static void main(String args[])
{
new ButtonComponentEvent();
}
// The listener implementations
class ResizeListener implements ActionListener
{
public void actionPerformed(ActionEvent ae)
{
// Increase width,height by 1
main.setSize(main.getWidth()+1,main.getHeight()+1);
}
}
class ShowListener implements ActionListener
{
public void actionPerformed(ActionEvent ae)
{
// If visible, hide else show
main.setVisible(!main.isVisible());
}
}
class MoveListener implements ActionListener
{
public void actionPerformed(ActionEvent ae)
{
// Move down 5 units from current location
main.setLocation(main.getX(),main.getY()+5);
}
}
}
ButtonComponentEvent(): Code illustrating ComponentListener with AWT Button is written here.
new ButtonComponentEvent(): Create object for the class ButtonComponentEvent
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