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 * 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

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package sun.lwawt.macosx;

import java.awt.Component;

import java.beans.PropertyChangeEvent;

import java.beans.PropertyChangeListener;

import javax.accessibility.Accessible;

import javax.accessibility.AccessibleContext;

import javax.swing.JProgressBar;

import javax.swing.JTabbedPane;

import javax.swing.JSlider;

import javax.swing.event.ChangeEvent;

import javax.swing.event.ChangeListener;

import static javax.accessibility.AccessibleContext.ACCESSIBLE_ACTIVE_DESCENDANT_PROPERTY;

import static javax.accessibility.AccessibleContext.ACCESSIBLE_CARET_PROPERTY;

import static javax.accessibility.AccessibleContext.ACCESSIBLE_SELECTION_PROPERTY;

import static javax.accessibility.AccessibleContext.ACCESSIBLE_STATE_PROPERTY;

import static javax.accessibility.AccessibleContext.ACCESSIBLE_TEXT_PROPERTY;

import static javax.accessibility.AccessibleContext.ACCESSIBLE_NAME_PROPERTY;

import javax.accessibility.AccessibleRole;

import javax.accessibility.AccessibleState;

import sun.awt.AWTAccessor;

class CAccessible extends CFRetainedResource implements Accessible {

    public static CAccessible getCAccessible(final Accessible a) {

        if (a == null) return null;

        AccessibleContext context = a.getAccessibleContext();

        AWTAccessor.AccessibleContextAccessor accessor

                = AWTAccessor.getAccessibleContextAccessor();

        final CAccessible cachedCAX = (CAccessible) accessor.getNativeAXResource(context);

        if (cachedCAX != null) {

            return cachedCAX;

        }

        final CAccessible newCAX = new CAccessible(a);

        accessor.setNativeAXResource(context, newCAX);

        return newCAX;

    }

    private static native void unregisterFromCocoaAXSystem(long ptr);

    private static native void valueChanged(long ptr);

    private static native void selectedTextChanged(long ptr);

    private static native void selectionChanged(long ptr);

    private static native void titleChanged(long ptr);

    private static native void menuOpened(long ptr);

    private static native void menuClosed(long ptr);

    private static native void menuItemSelected(long ptr);

    private Accessible accessible;

    private AccessibleContext activeDescendant;

    private CAccessible(final Accessible accessible) {

        super(0L, true); // real pointer will be poked in by native

        if (accessible == null) throw new NullPointerException();

        this.accessible = accessible;

        if (accessible instanceof Component) {

            addNotificationListeners((Component)accessible);

        }

    }

    @Override

    protected synchronized void dispose() {

        if (ptr != 0) unregisterFromCocoaAXSystem(ptr);

        super.dispose();

    }

    @Override

    public AccessibleContext getAccessibleContext() {

        return accessible.getAccessibleContext();

    }

    public void addNotificationListeners(Component c) {

        if (c instanceof Accessible) {

            AccessibleContext ac = ((Accessible)c).getAccessibleContext();

            ac.addPropertyChangeListener(new AXChangeNotifier());

        }

        if (c instanceof JProgressBar) {

            JProgressBar pb = (JProgressBar) c;

            pb.addChangeListener(new AXProgressChangeNotifier());

        } else if (c instanceof JSlider) {

            JSlider slider = (JSlider) c;

            slider.addChangeListener(new AXProgressChangeNotifier());

        }

    }

    private class AXChangeNotifier implements PropertyChangeListener {

        @Override

        public void propertyChange(PropertyChangeEvent e) {

            String name = e.getPropertyName();

            if ( ptr != 0 ) {

                Object newValue = e.getNewValue();

                Object oldValue = e.getOldValue();

                if (name.compareTo(ACCESSIBLE_CARET_PROPERTY) == 0) {

                    selectedTextChanged(ptr);

                } else if (name.compareTo(ACCESSIBLE_TEXT_PROPERTY) == 0) {

                    valueChanged(ptr);

                } else if (name.compareTo(ACCESSIBLE_SELECTION_PROPERTY) == 0) {

                    selectionChanged(ptr);

                } else if (name.compareTo(ACCESSIBLE_ACTIVE_DESCENDANT_PROPERTY) == 0 ) {

                    if (newValue instanceof AccessibleContext) {

                        activeDescendant = (AccessibleContext)newValue;

                    }

                } else if (name.compareTo(ACCESSIBLE_STATE_PROPERTY) == 0) {

                    AccessibleContext thisAC = accessible.getAccessibleContext();

                    AccessibleRole thisRole = thisAC.getAccessibleRole();

                    Accessible parentAccessible = thisAC.getAccessibleParent();

                    AccessibleRole parentRole = null;

                    if (parentAccessible != null) {

                        parentRole = parentAccessible.getAccessibleContext().getAccessibleRole();

                    }

                    // At least for now don't handle combo box menu state changes.

                    // This may change when later fixing issues which currently

                    // exist for combo boxes, but for now the following is only

                    // for JPopupMenus, not for combobox menus.

                    if (parentRole != AccessibleRole.COMBO_BOX) {

                        if (thisRole == AccessibleRole.POPUP_MENU) {

                            if ( newValue != null &&

                                 ((AccessibleState)newValue) == AccessibleState.VISIBLE ) {

                                    menuOpened(ptr);

                            } else if ( oldValue != null &&

                                        ((AccessibleState)oldValue) == AccessibleState.VISIBLE ) {

                                menuClosed(ptr);

                            }

                        } else if (thisRole == AccessibleRole.MENU_ITEM) {

                            if ( newValue != null &&

                                 ((AccessibleState)newValue) == AccessibleState.FOCUSED ) {

                                menuItemSelected(ptr);

                            }

                        }

                    }

                    // Do send check box state changes to native side

                    if (thisRole == AccessibleRole.CHECK_BOX) {

                        valueChanged(ptr);

                    }

                } else if (name.compareTo(ACCESSIBLE_NAME_PROPERTY) == 0) {

                    //for now trigger only for JTabbedPane.

                    if (e.getSource() instanceof JTabbedPane) {

                        titleChanged(ptr);

                    }

                }

            }

        }

    }

    private class AXProgressChangeNotifier implements ChangeListener {

        @Override

        public void stateChanged(ChangeEvent e) {

            if (ptr != 0) valueChanged(ptr);

        }

    }

    static Accessible getSwingAccessible(final Accessible a) {

        return (a instanceof CAccessible) ? ((CAccessible)a).accessible : a;

    }

    static AccessibleContext getActiveDescendant(final Accessible a) {

        return (a instanceof CAccessible) ? ((CAccessible)a).activeDescendant : null;

    }

}