/**************************************************************
 * 
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 * 
 *   http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
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package org.openoffice.java.accessibility;

import com.sun.star.accessibility.*;
import com.sun.star.uno.AnyConverter;
import com.sun.star.uno.UnoRuntime;

import javax.accessibility.AccessibleState;


public abstract class DescendantManager extends Component {
    protected XAccessibleSelection unoAccessibleSelection = null;
    protected javax.accessibility.Accessible activeDescendant = null;
    protected boolean multiselectable = false;

    protected DescendantManager(XAccessible xAccessible,
        XAccessibleContext xAccessibleContext) {
        super(xAccessible, xAccessibleContext);
    }

    protected DescendantManager(XAccessible xAccessible,
        XAccessibleContext xAccessibleContext, boolean multiselectable) {
        super(xAccessible, xAccessibleContext);
        this.multiselectable = multiselectable;
    }

    /**
    * Update the proxy objects appropriatly on property change events
    */
    protected class AccessibleDescendantManagerListener
        extends AccessibleUNOComponentListener {
        protected AccessibleDescendantManagerListener() {
            unoAccessibleSelection = (XAccessibleSelection) UnoRuntime.queryInterface(XAccessibleSelection.class,
                    unoAccessibleContext);
        }

        /** Called by OpenOffice process to notify property changes */
        public void notifyEvent(AccessibleEventObject event) {
            switch (event.EventId) {
                case AccessibleEventId.SELECTION_CHANGED:
                    firePropertyChange(javax.accessibility.AccessibleContext.ACCESSIBLE_SELECTION_PROPERTY,
                        null, null);

                    break;

                default:
                    super.notifyEvent(event);
            }
        }
    }

    protected abstract class AccessibleDescendantManager
        extends AccessibleUNOComponent
        implements javax.accessibility.AccessibleSelection {
        protected AccessibleDescendantManager() {
            unoAccessibleSelection = (XAccessibleSelection) UnoRuntime.queryInterface(XAccessibleSelection.class,
                    unoAccessibleContext);
        }

        /*
        * AccessibleContext
        */

        /** Returns the number of accessible children of the object */
        public int getAccessibleChildrenCount() {
            try {
                return unoAccessibleContext.getAccessibleChildCount();
            } catch (com.sun.star.uno.RuntimeException e) {
                return 0;
            }
        }

        /** Returns the AccessibleSelection interface for this object */
        public javax.accessibility.AccessibleSelection getAccessibleSelection() {
            return (unoAccessibleSelection != null) ? this : null;
        }

        /*
        * AccessibleSelection
        */

        /** Adds the specified Accessible child of the object to the object's selection */
        public void addAccessibleSelection(int i) {
            try {
                unoAccessibleSelection.selectAccessibleChild(i);
            } catch (com.sun.star.lang.IndexOutOfBoundsException e) {
            } catch (com.sun.star.uno.RuntimeException e) {
            }
        }

        /** Clears the selection in the object, so that no children in the object are selected */
        public void clearAccessibleSelection() {
            try {
                unoAccessibleSelection.clearAccessibleSelection();
            } catch (com.sun.star.uno.RuntimeException e) {
            }
        }

        /** Returns the number of Accessible children currently selected */
        public int getAccessibleSelectionCount() {
            try {
                return unoAccessibleSelection.getSelectedAccessibleChildCount();
            } catch (com.sun.star.uno.RuntimeException e) {
                return 0;
            }
        }

        /** Determines if the current child of this object is selected */
        public boolean isAccessibleChildSelected(int i) {
            try {
                return unoAccessibleSelection.isAccessibleChildSelected(i);
            } catch (com.sun.star.lang.IndexOutOfBoundsException e) {
                return false;
            } catch (com.sun.star.uno.RuntimeException e) {
                return false;
            }
        }

        /** Removes the specified child of the object from the object's selection */
        public void removeAccessibleSelection(int i) {
            try {
                unoAccessibleSelection.deselectAccessibleChild(i);
            } catch (com.sun.star.lang.IndexOutOfBoundsException e) {
            } catch (com.sun.star.uno.RuntimeException e) {
            }
        }

        /** Causes every child of the object to be selected if the object supports multiple selection */
        public void selectAllAccessibleSelection() {
            try {
                unoAccessibleSelection.selectAllAccessibleChildren();
            } catch (com.sun.star.uno.RuntimeException e) {
            }
        }
    }
}