/*

 * Copyright (c) 1997, 2012, 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

 */

@SuppressWarnings("serial")

class AncestorNotifier implements ComponentListener, PropertyChangeListener, Serializable

{

    transient 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);

                }

            }

        }

    }

}