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DOS/V Power Report 1998 February
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APP_DEMO
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Click2.java
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1997-10-27
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import java.awt.*;
import java.awt.event.*;
import java.applet.*;
/**
* This version of the Click applet fixes Click2 by extending
* the nested TargetListener class with methods that redispatch
* the mouse motion events from the target columns to the applet.
* Note that we're translating the events coordinates from the
* source components coordinate system to the applets coordinate
* system.
*
* This applet runs correctly in HotJava, it requires JDK 1.1.
*/
public class Click2 extends Applet
{
Color puckColor = new Color(200, 0, 10);
Box puck = new Box(puckColor);
ColumnOfBoxes[] targets = new ColumnOfBoxes[8];
private final static class TargetListener
extends MouseAdapter implements MouseMotionListener
{
private Color newBackground;
private Color oldBackground;
TargetListener(Color newBackground) {
this.newBackground = newBackground;
}
public void mouseEntered(MouseEvent e) {
oldBackground = e.getComponent().getBackground();
e.getComponent().setBackground(newBackground);
}
public void mouseExited(MouseEvent e) {
e.getComponent().setBackground(oldBackground);
}
private void redispatch(MouseEvent e) {
Point origin = e.getComponent().getLocation();
e.translatePoint(origin.x, origin.y);
e.getComponent().getParent().dispatchEvent(e);
}
public void mouseMoved(MouseEvent e) { redispatch(e); }
public void mouseDragged(MouseEvent e) { redispatch(e); }
public void mouseClicked(MouseEvent e) { redispatch(e); }
}
public Click2()
{
MouseMotionListener movePuck = new MouseMotionAdapter() {
public void mouseMoved(MouseEvent e)
{
int x = e.getX();
int y = getSize().height - puck.getSize().height;
puck.setLocation(x, y);
}
};
/* Create a row of targets, i.e. columns of boxes, along
* the top of the applet. Each target column contains
* between one and four boxes.
*/
for(int i = 0; i < targets.length; i++) {
int nBoxes = 1 + (int)(Math.random() * 4.0);
float boxHue = (float)i / (float)targets.length;
Color boxColor = Color.getHSBColor(boxHue, 0.5f, 0.85f);
TargetListener tl = new TargetListener(boxColor.brighter());
targets[i] = new ColumnOfBoxes(boxColor, nBoxes);
targets[i].addMouseListener(tl);
targets[i].addMouseMotionListener(tl);
add(targets[i]);
}
add(puck);
addMouseMotionListener(movePuck);
}
public static void main(String[] args)
{
WindowListener l = new WindowAdapter()
{
public void windowClosing(WindowEvent e) {System.exit(0);}
};
Frame f = new Frame("Click");
f.addWindowListener(l);
f.add(new Click2());
f.setSize(600, 400);
f.show();
}
}