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package gjt;
import java.applet.Applet;
import java.awt.*;
/**
* A handy collection of methods for getting a component's
* frame, getting a component's applet, waiting for a
* component's image, and wallpapering a components background.
* <p>
*
* @version 1.0, Apr 1 1996
* @author David Geary
*/
public class Util {
public static Frame getFrame(Component component) {
Component c = component;
if(c instanceof Frame)
return (Frame)c;
while((c = c.getParent()) != null) {
if(c instanceof Frame)
return (Frame)c;
}
return null;
}
public static Applet getApplet(Component component) {
Component c = component;
if(c instanceof Applet)
return (Applet)c;
while((c = c.getParent()) != null) {
if(c instanceof Applet)
return (Applet)c;
}
return null;
}
public static void waitForImage(Component component,
Image image) {
MediaTracker tracker = new MediaTracker(component);
try {
tracker.addImage(image, 0);
tracker.waitForID(0);
}
catch(InterruptedException e) { Assert.notNull(null); }
}
public static void wallPaper(Component component,
Graphics g,
Image image) {
Dimension compsize = component.size();
Util.waitForImage(component, image);
int patchW = image.getWidth(component);
int patchH = image.getHeight(component);
Assert.notFalse(patchW != -1 && patchH != -1);
for(int r=0; r < compsize.width; r += patchW) {
for(int c=0; c < compsize.height; c += patchH)
g.drawImage(image, r, c, component);
}
}
public static void setCursor(int cursor,
Component component) {
getFrame(component).setCursor(cursor);
}
}
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