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package gjt;
import java.awt.Event;
/**
* A controller for an ImageButton, this abstract class
* establishes the association between itself and an ImageButton
* and delivers events to its ImageButton.<p>
*
* ImageButtonControllers must be constructed with an
* ImageButton; the ImageButton's controller gets set by
* ImageButtonController's constructor.<p>
*
* The ImageButton passed into the constructor must not be null;
* this is enforced by an assertion.<p>
*
* Methods defined in the MouseController interface are left
* for subclasses to implement. ImageButtonController defines
* mouseMove(), mouseEnter() and mouseExit() as no-ops, so
* that extensions of ImageButtonController only have to
* implement mouseDown(), mouseUp() and mouseDrag(). Note
* that extensions are still free to override mouseMove(),
* mouseEnter() and mouseExit() if desired.<p>
*
* Subclasses should also call the protected XXXButton(Event)
* methods below, where XXX is either arm, disarm, activate, or
* deactivate as appropriate. SpringyImageButtonController is
* a good example of this (so is StickyImageButtonController,
* but it is more complicated than it's springy sibling).<p>
*
* @version 1.0, Apr 1 1996
* @author David Geary
* @see MouseController
* @see ImageButton
* @see ImageButtonEvent
* @see SpringyImageButtonController
* @see StickyImageButtonController
* @see gjt.test.ImageButtonTest
*/
public abstract class ImageButtonController
implements MouseController {
private ImageButton button;
ImageButtonController(ImageButton button) {
Assert.notNull(button);
this.button = button;
button.setController(this);
}
public ImageButton getButton() {
return button;
}
public boolean mouseEnter(Event event, int x, int y) {
return false;
}
public boolean mouseExit (Event event, int x, int y) {
return false;
}
public boolean mouseMove (Event event, int x, int y) {
return false;
}
protected void armButton(Event event) {
button.deliverEvent(
new ImageButtonEvent(button,
event,
ImageButtonEvent.ARM));
}
protected void disarmButton(Event event) {
button.deliverEvent(
new ImageButtonEvent(button,
event,
ImageButtonEvent.DISARM));
}
protected void activateButton(Event event) {
button.deliverEvent(
new ImageButtonEvent(button,
event,
ImageButtonEvent.ACTIVATE));
}
}
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