| /* |
| * Copyright (c) 1997, 2008, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| 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; |
| |
| |
| /** |
| * @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 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); |
| } |
| } |
| } |
| } |
| } |