- /*
- * @(#)AncestorNotifier.java 1.19 03/12/19
- *
- * Copyright 2004 Sun Microsystems, Inc. All rights reserved.
- * SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
- */
-
- package javax.swing;
-
-
- import javax.swing.event.*;
- import java.awt.event.*;
-
- import java.awt.Component;
- import java.awt.Container;
- import java.awt.Window;
- import java.beans.PropertyChangeListener;
- import java.beans.PropertyChangeEvent;
-
- import java.io.Serializable;
-
-
- /**
- * @version 1.19 12/19/03
- * @author Dave Moore
- */
-
- class AncestorNotifier implements ComponentListener, PropertyChangeListener, Serializable
- {
- Component firstInvisibleAncestor;
- EventListenerList listenerList = new EventListenerList();
- JComponent root;
-
- AncestorNotifier(JComponent root) {
- this.root = root;
- addListeners(root, true);
- }
-
- void addAncestorListener(AncestorListener l) {
- listenerList.add(AncestorListener.class, l);
- }
-
- void removeAncestorListener(AncestorListener l) {
- listenerList.remove(AncestorListener.class, l);
- }
-
- AncestorListener[] getAncestorListeners() {
- return (AncestorListener[])listenerList.getListeners(AncestorListener.class);
- }
-
- /*
- * Notify all listeners that have registered interest for
- * notification on this event type. The event instance
- * is lazily created using the parameters passed into
- * the fire method.
- * @see EventListenerList
- */
- protected void fireAncestorAdded(JComponent source, int id, Container ancestor, Container ancestorParent) {
- // Guaranteed to return a non-null array
- Object[] listeners = listenerList.getListenerList();
- // Process the listeners last to first, notifying
- // those that are interested in this event
- for (int i = listeners.length-2; i>=0; i-=2) {
- if (listeners[i]==AncestorListener.class) {
- // Lazily create the event:
- AncestorEvent ancestorEvent =
- new AncestorEvent(source, id, ancestor, ancestorParent);
- ((AncestorListener)listeners[i+1]).ancestorAdded(ancestorEvent);
- }
- }
- }
-
- /*
- * Notify all listeners that have registered interest for
- * notification on this event type. The event instance
- * is lazily created using the parameters passed into
- * the fire method.
- * @see EventListenerList
- */
- protected void fireAncestorRemoved(JComponent source, int id, Container ancestor, Container ancestorParent) {
- // Guaranteed to return a non-null array
- Object[] listeners = listenerList.getListenerList();
- // Process the listeners last to first, notifying
- // those that are interested in this event
- for (int i = listeners.length-2; i>=0; i-=2) {
- if (listeners[i]==AncestorListener.class) {
- // Lazily create the event:
- AncestorEvent ancestorEvent =
- new AncestorEvent(source, id, ancestor, ancestorParent);
- ((AncestorListener)listeners[i+1]).ancestorRemoved(ancestorEvent);
- }
- }
- }
- /*
- * Notify all listeners that have registered interest for
- * notification on this event type. The event instance
- * is lazily created using the parameters passed into
- * the fire method.
- * @see EventListenerList
- */
- protected void fireAncestorMoved(JComponent source, int id, Container ancestor, Container ancestorParent) {
- // Guaranteed to return a non-null array
- Object[] listeners = listenerList.getListenerList();
- // Process the listeners last to first, notifying
- // those that are interested in this event
- for (int i = listeners.length-2; i>=0; i-=2) {
- if (listeners[i]==AncestorListener.class) {
- // Lazily create the event:
- AncestorEvent ancestorEvent =
- new AncestorEvent(source, id, ancestor, ancestorParent);
- ((AncestorListener)listeners[i+1]).ancestorMoved(ancestorEvent);
- }
- }
- }
-
- void removeAllListeners() {
- removeListeners(root);
- }
-
- void addListeners(Component ancestor, boolean addToFirst) {
- Component a;
-
- firstInvisibleAncestor = null;
- for (a = ancestor;
- firstInvisibleAncestor == null;
- a = a.getParent()) {
- if (addToFirst || a != ancestor) {
- a.addComponentListener(this);
-
- if (a instanceof JComponent) {
- JComponent jAncestor = (JComponent)a;
-
- jAncestor.addPropertyChangeListener(this);
- }
- }
- if (!a.isVisible() || a.getParent() == null || a instanceof Window) {
- firstInvisibleAncestor = a;
- }
- }
- if (firstInvisibleAncestor instanceof Window &&
- firstInvisibleAncestor.isVisible()) {
- firstInvisibleAncestor = null;
- }
- }
-
- void removeListeners(Component ancestor) {
- Component a;
- for (a = ancestor; a != null; a = a.getParent()) {
- a.removeComponentListener(this);
- if (a instanceof JComponent) {
- JComponent jAncestor = (JComponent)a;
- jAncestor.removePropertyChangeListener(this);
- }
- if (a == firstInvisibleAncestor || a instanceof Window) {
- break;
- }
- }
- }
-
- public void componentResized(ComponentEvent e) {}
-
- public void componentMoved(ComponentEvent e) {
- Component source = e.getComponent();
-
- fireAncestorMoved(root, AncestorEvent.ANCESTOR_MOVED,
- (Container)source, source.getParent());
- }
-
- public void componentShown(ComponentEvent e) {
- Component ancestor = e.getComponent();
-
- if (ancestor == firstInvisibleAncestor) {
- addListeners(ancestor, false);
- if (firstInvisibleAncestor == null) {
- fireAncestorAdded(root, AncestorEvent.ANCESTOR_ADDED,
- (Container)ancestor, ancestor.getParent());
- }
- }
- }
-
- public void componentHidden(ComponentEvent e) {
- Component ancestor = e.getComponent();
- boolean needsNotify = firstInvisibleAncestor == null;
-
- if ( !(ancestor instanceof Window) ) {
- removeListeners(ancestor.getParent());
- }
- firstInvisibleAncestor = ancestor;
- if (needsNotify) {
- fireAncestorRemoved(root, AncestorEvent.ANCESTOR_REMOVED,
- (Container)ancestor, ancestor.getParent());
- }
- }
-
- public void propertyChange(PropertyChangeEvent evt) {
- String s = evt.getPropertyName();
-
- if (s!=null && (s.equals("parent") || s.equals("ancestor"))) {
- JComponent component = (JComponent)evt.getSource();
-
- if (evt.getNewValue() != null) {
- if (component == firstInvisibleAncestor) {
- addListeners(component, false);
- if (firstInvisibleAncestor == null) {
- fireAncestorAdded(root, AncestorEvent.ANCESTOR_ADDED,
- component, component.getParent());
- }
- }
- } else {
- boolean needsNotify = firstInvisibleAncestor == null;
- Container oldParent = (Container)evt.getOldValue();
-
- removeListeners(oldParent);
- firstInvisibleAncestor = component;
- if (needsNotify) {
- fireAncestorRemoved(root, AncestorEvent.ANCESTOR_REMOVED,
- component, oldParent);
- }
- }
- }
- }
- }