AOO410/main/accessibility/bridge/org/openoffice/java/accessibility/Paragraph.java

/**************************************************************
 * 
 * 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
 * under the License.
 * 
 *************************************************************/



package org.openoffice.java.accessibility;

import javax.accessibility.AccessibleContext;
import javax.accessibility.AccessibleText;

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

/** 
 */
public class Paragraph extends Container implements javax.accessibility.Accessible {
    
    protected Paragraph(XAccessible xAccessible, XAccessibleContext xAccessibleContext) {
        super(javax.accessibility.AccessibleRole.TEXT, xAccessible, xAccessibleContext);
    }
    
    protected class AccessibleParagraphListener extends AccessibleContainerListener {
        
        protected AccessibleParagraphListener() {
            super();
        }

        protected void setComponentState(short state, boolean enable) {
            switch (state) {
                case AccessibleStateType.EDITABLE:
                    fireStatePropertyChange(javax.accessibility.AccessibleState.EDITABLE, enable);
                    break;
                case AccessibleStateType.MULTI_LINE:
                    fireStatePropertyChange(javax.accessibility.AccessibleState.MULTI_LINE, enable);
                    break;
                case AccessibleStateType.SINGLE_LINE:
                    break;
                default:
                    super.setComponentState(state, enable);
                    break;
            }
        }
               

        protected void handleVisibleDataChanged() {
            if (Paragraph.this.isFocusOwner()) {
                AccessibleContext ac = accessibleContext;
                if (ac != null) {
                    AccessibleText at = ac.getAccessibleText();
                    if (at != null) {
                        int pos = at.getCaretPosition();
                        // Simulating a caret event here should help at tools
                        // that re not aware of the paragraph approach of OOo.
                        firePropertyChange(ac.ACCESSIBLE_CARET_PROPERTY,
                            new Integer(-1), new Integer(pos));
                    }
                }
            }
        }
        
        /** Called by OpenOffice process to notify property changes */
        public void notifyEvent(AccessibleEventObject event) {
            switch (event.EventId) {
                case AccessibleEventId.CARET_CHANGED:
                    firePropertyChange(accessibleContext.ACCESSIBLE_CARET_PROPERTY,
                        Component.toNumber(event.OldValue), 
                        Component.toNumber(event.NewValue));
                    break;
                case AccessibleEventId.VISIBLE_DATA_CHANGED:
                case AccessibleEventId.BOUNDRECT_CHANGED:
                    // Whenever a paragraph gets inserted above the currently
                    // focused one, this is the only event that will occur for.
                    handleVisibleDataChanged();
                default:
                    super.notifyEvent(event);
                break;
            }
        }
    }
    
    protected XAccessibleEventListener createEventListener() {
        return new AccessibleParagraphListener();
    }
    
    /** Creates the AccessibleContext associated with this object */
    public javax.accessibility.AccessibleContext createAccessibleContext() {
        return new AccessibleParagraph();
    }

    protected class AccessibleParagraph extends AccessibleContainer {
        
        protected AccessibleParagraph() {
            // Don't do the queryInterface on XAccessibleText already ..
            super(false);
            /* Since getAccessibleText() is heavily used by the java access 
             * bridge for gnome and the gnome at-tools, we do a query interface
             * here and remember the result.
             */
            accessibleText = AccessibleHypertextImpl.get(unoAccessibleContext);
        }
    
        /*
        * AccessibleContext
        */

        /** Gets the role of this object */
        public javax.accessibility.AccessibleRole getAccessibleRole() {
            return javax.accessibility.AccessibleRole.TEXT;
        }

        /** Gets the AccessibleEditableText associated with this object presenting text on the display */
        public javax.accessibility.AccessibleEditableText getAccessibleEditableText() {
            
            if (disposed)
                return null;
            
            try {
                XAccessibleEditableText unoAccessibleText = (XAccessibleEditableText) 
                    UnoRuntime.queryInterface(XAccessibleEditableText.class,
                    unoAccessibleComponent);
                if (unoAccessibleText != null) {
                    return new AccessibleEditableTextImpl(unoAccessibleText);
                } else {
                    return null;
                }
            } catch (com.sun.star.uno.RuntimeException e) {
                return null;
            }
        }
        
        /** Gets the AccessibleAction associated with this object that has a graphical representation */
        public javax.accessibility.AccessibleAction getAccessibleAction() {
            try {
                XAccessibleAction unoAccessibleAction = (XAccessibleAction)
                    UnoRuntime.queryInterface(XAccessibleAction.class, unoAccessibleComponent);
                return (unoAccessibleAction != null) ? 
                    new AccessibleActionImpl(unoAccessibleAction) : null;
            } catch (com.sun.star.uno.RuntimeException e) {
                return null;
            }
        }
        
        /** Returns the relation set of this object */
        public javax.accessibility.AccessibleRelationSet getAccessibleRelationSet() {
            try {
                XAccessibleRelationSet unoAccessibleRelationSet = 
                    unoAccessible.getAccessibleContext().getAccessibleRelationSet();
                if (unoAccessibleRelationSet == null) {
                    return super.getAccessibleRelationSet();
                }
                
                javax.accessibility.AccessibleRelationSet relationSet = new javax.accessibility.AccessibleRelationSet();
                int count = unoAccessibleRelationSet.getRelationCount();
                for (int i = 0; i < count; i++) {
                    AccessibleRelation unoAccessibleRelation = unoAccessibleRelationSet.getRelation(i);
                    switch (unoAccessibleRelation.RelationType) {
                        case AccessibleRelationType.CONTROLLED_BY:
                            relationSet.add(new javax.accessibility.AccessibleRelation(
                                javax.accessibility.AccessibleRelation.CONTROLLED_BY,
                                getAccessibleComponents(unoAccessibleRelation.TargetSet)));
                            break;
                        case AccessibleRelationType.CONTROLLER_FOR:
                            relationSet.add(new javax.accessibility.AccessibleRelation(
                                javax.accessibility.AccessibleRelation.CONTROLLER_FOR,
                                getAccessibleComponents(unoAccessibleRelation.TargetSet)));
                            break;
                        case AccessibleRelationType.LABELED_BY:
                            relationSet.add(new javax.accessibility.AccessibleRelation(
                                javax.accessibility.AccessibleRelation.LABELED_BY,
                                getAccessibleComponents(unoAccessibleRelation.TargetSet)));
                            break;
                        case AccessibleRelationType.MEMBER_OF:
                            relationSet.add(new javax.accessibility.AccessibleRelation(
                                javax.accessibility.AccessibleRelation.MEMBER_OF,
                                getAccessibleComponents(unoAccessibleRelation.TargetSet)));
                            break;
                        case AccessibleRelationType.CONTENT_FLOWS_TO:
                            relationSet.add(new javax.accessibility.AccessibleRelation(
                                "flowsTo",
                                getAccessibleComponents(unoAccessibleRelation.TargetSet)));
                            break;
                        case AccessibleRelationType.CONTENT_FLOWS_FROM:
                            relationSet.add(new javax.accessibility.AccessibleRelation(
                                "flowsFrom",
                                getAccessibleComponents(unoAccessibleRelation.TargetSet)));
                            break;
                        default:
                            break;
                    }
                }
                return relationSet;
            } catch (com.sun.star.lang.IndexOutOfBoundsException e) {
                return super.getAccessibleRelationSet();
            } catch (com.sun.star.uno.RuntimeException e) {
                return super.getAccessibleRelationSet();
            }
        }
    }
}