1 /*

     2  * Copyright (C) 2009 Google Inc. All rights reserved.

     3  *

     4  * Redistribution and use in source and binary forms, with or without

     5  * modification, are permitted provided that the following conditions are

     6  * met:

     7  *

     8  *     * Redistributions of source code must retain the above copyright

     9  * notice, this list of conditions and the following disclaimer.

    10  *     * Redistributions in binary form must reproduce the above

    11  * copyright notice, this list of conditions and the following disclaimer

    12  * in the documentation and/or other materials provided with the

    13  * distribution.

    14  *     * Neither the name of Google Inc. nor the names of its

    15  * contributors may be used to endorse or promote products derived from

    16  * this software without specific prior written permission.

    17  *

    18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS

    19  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT

    20  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR

    21  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT

    22  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,

    23  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT

    24  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,

    25  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY

    26  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

    27  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE

    28  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

    29  */

    30 

    31 #ifndef WebAccessibilityCacheImpl_h

    32 #define WebAccessibilityCacheImpl_h

    33 

    34 #include "AccessibilityObjectWrapper.h"

    35 #include "WebAccessibilityCache.h"

    36 #include <wtf/HashMap.h>

    37 #include <wtf/PassRefPtr.h>

    38 

    39 namespace WebKit {

    40 

    41 // FIXME: Should be eliminated to use AXObjectCache instead.

    42 class WebAccessibilityCacheImpl : public WebKit::WebAccessibilityCache {

    43 public:

    44     virtual void initialize(WebView* view);

    45     virtual bool isInitialized() const { return m_initialized; }

    46 

    47     virtual WebAccessibilityObject getObjectById(int);

    48     virtual bool isValidId(int) const;

    49     virtual int addOrGetId(const WebKit::WebAccessibilityObject&);

    50 

    51     virtual void remove(int);

    52     virtual void clear();

    53 

    54 protected:

    55     friend class WebKit::WebAccessibilityCache;

    56 

    57     WebAccessibilityCacheImpl();

    58     ~WebAccessibilityCacheImpl();

    59 

    60 private:

    61     // FIXME: This can be just part of Chromium's AccessibilityObjectWrapper.

    62     class WeakHandle : public WebCore::AccessibilityObjectWrapper {

    63     public:

    64         static PassRefPtr<WeakHandle> create(WebCore::AccessibilityObject*);

    65         virtual void detach();

    66     private:

    67         WeakHandle(WebCore::AccessibilityObject*);

    68     };

    69 

    70     typedef HashMap<int, RefPtr<WeakHandle> > ObjectMap;

    71     typedef HashMap<WebCore::AccessibilityObject*, int> IdMap;

    72 

    73     // Hashmap for caching of elements in use by the AT, mapping id (int) to

    74     // WebAccessibilityObject.

    75     ObjectMap m_objectMap;

    76     // Hashmap for caching of elements in use by the AT, mapping a

    77     // AccessibilityObject pointer to its id (int). Needed for reverse lookup,

    78     // to ensure unnecessary duplicate entries are not created in the

    79     // ObjectMap and for focus changes in WebKit.

    80     IdMap m_idMap;

    81 

    82     // Unique identifier for retrieving an accessibility object from the page's

    83     // hashmaps. Id is always 0 for the root of the accessibility object

    84     // hierarchy (on a per-renderer process basis).

    85     int m_nextNewId;

    86 

    87     bool m_initialized;

    88 };

    89 

    90 }

    91 

    92 #endif