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| 1 // Copyright (c) 2006-2008 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2006-2008 The Chromium Authors. All rights reserved. |
| 2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
| 3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
| 4 | 4 |
| 5 #ifndef CHROME_BROWSER_BROWSER_ACCESSIBILITY_MANAGER_H_ | 5 #ifndef CHROME_BROWSER_BROWSER_ACCESSIBILITY_MANAGER_H_ |
| 6 #define CHROME_BROWSER_BROWSER_ACCESSIBILITY_MANAGER_H_ | 6 #define CHROME_BROWSER_BROWSER_ACCESSIBILITY_MANAGER_H_ |
| 7 | 7 |
| 8 #include <oaidl.h> // Needed for VARIANT structure. | 8 #include <oaidl.h> // Needed for VARIANT structure. |
| 9 #include <hash_map> | 9 #include <hash_map> |
| 10 | 10 |
| 11 #include "base/singleton.h" | 11 #include "base/singleton.h" |
| 12 #include "chrome/common/accessibility.h" | |
| 13 #include "chrome/common/notification_observer.h" | 12 #include "chrome/common/notification_observer.h" |
| 13 #include "webkit/glue/webaccessibility.h" |
| 14 | 14 |
| 15 class BrowserAccessibility; | 15 class BrowserAccessibility; |
| 16 class RenderProcessHost; | 16 class RenderProcessHost; |
| 17 class RenderWidgetHost; | 17 class RenderWidgetHost; |
| 18 | 18 |
| 19 //////////////////////////////////////////////////////////////////////////////// | 19 //////////////////////////////////////////////////////////////////////////////// |
| 20 // | 20 // |
| 21 // BrowserAccessibilityManager | 21 // BrowserAccessibilityManager |
| 22 // | 22 // |
| 23 // Used to manage instance creation and memory handling for browser side | 23 // Used to manage instance creation and memory handling for browser side |
| 24 // accessibility. A singleton class. It implements NotificationObserver to | 24 // accessibility. A singleton class. It implements NotificationObserver to |
| 25 // ensure that a termination of a renderer process gets propagated to the | 25 // ensure that a termination of a renderer process gets propagated to the |
| 26 // active BrowserAccessibility instances calling into it. Each such instance | 26 // active BrowserAccessibility instances calling into it. Each such instance |
| 27 // will upon such an event be set to an inactive state, failing calls from the | 27 // will upon such an event be set to an inactive state, failing calls from the |
| 28 // assistive technology gracefully. | 28 // assistive technology gracefully. |
| 29 //////////////////////////////////////////////////////////////////////////////// | 29 //////////////////////////////////////////////////////////////////////////////// |
| 30 class BrowserAccessibilityManager : public NotificationObserver { | 30 class BrowserAccessibilityManager : public NotificationObserver { |
| 31 public: | 31 public: |
| 32 // Gets the singleton BrowserAccessibilityManager object. The first time this | 32 // Gets the singleton BrowserAccessibilityManager object. The first time this |
| 33 // method is called, a CacheManagerHost object is constructed and returned. | 33 // method is called, a CacheManagerHost object is constructed and returned. |
| 34 // Subsequent calls will return the same object. | 34 // Subsequent calls will return the same object. |
| 35 static BrowserAccessibilityManager* GetInstance(); | 35 static BrowserAccessibilityManager* GetInstance(); |
| 36 | 36 |
| 37 // Creates an instance of BrowserAccessibility, initializes it and sets the | 37 // Creates an instance of BrowserAccessibility, initializes it and sets the |
| 38 // iaccessible_id and parent_id. | 38 // [acc_obj_id], which is used for IPC communication, and [instance_id], |
| 39 // which is used to identify the mapping between accessibility instance and |
| 40 // RenderProcess. |
| 39 STDMETHODIMP CreateAccessibilityInstance(REFIID iid, | 41 STDMETHODIMP CreateAccessibilityInstance(REFIID iid, |
| 40 int iaccessible_id, | 42 int acc_obj_id, |
| 41 int instance_id, | 43 int instance_id, |
| 42 void** interface_ptr); | 44 void** interface_ptr); |
| 43 | 45 |
| 44 // Composes and sends a message for requesting needed accessibility | 46 // Composes and sends a message for requesting needed accessibility |
| 45 // information. Unused LONG input parameters should be NULL, and the VARIANT | 47 // information. Unused LONG input parameters should be NULL, and the VARIANT |
| 46 // an empty, valid instance. | 48 // [var_id] an empty, valid instance. |
| 47 bool RequestAccessibilityInfo(int iaccessible_id, | 49 bool RequestAccessibilityInfo(int acc_obj_id, |
| 48 int instance_id, | 50 int instance_id, |
| 49 int iaccessible_func_id, | 51 int acc_func_id, |
| 50 VARIANT var_id, | 52 int child_id, |
| 51 LONG input1, | 53 long input1, |
| 52 LONG input2); | 54 long input2); |
| 53 | 55 |
| 54 // Wrapper function, for cleaner code. | 56 // Wrapper function, for cleaner code. |
| 55 const AccessibilityOutParams& response(); | 57 const webkit_glue::WebAccessibility::OutParams& response(); |
| 56 | 58 |
| 57 // Retrieves the parent HWND connected to the provided id. | 59 // Retrieves the parent HWND connected to the provided id. |
| 58 HWND parent_hwnd(int id); | 60 HWND parent_hwnd(int id); |
| 59 | 61 |
| 60 // Mutator, needed since constructor does not take any arguments, and to keep | 62 // Mutator, needed since constructor does not take any arguments, and to keep |
| 61 // instance accessor clean. | 63 // instance accessor clean. |
| 62 int SetMembers(BrowserAccessibility* browser_acc, | 64 int SetMembers(BrowserAccessibility* browser_acc, |
| 63 HWND parent_hwnd, | 65 HWND parent_hwnd, |
| 64 RenderWidgetHost* render_widget_host); | 66 RenderWidgetHost* render_widget_host); |
| 65 | 67 |
| 66 // NotificationObserver implementation. | 68 // NotificationObserver implementation. |
| 67 virtual void Observe(NotificationType type, | 69 virtual void Observe(NotificationType type, |
| 68 const NotificationSource& source, | 70 const NotificationSource& source, |
| 69 const NotificationDetails& details); | 71 const NotificationDetails& details); |
| 70 | 72 |
| 71 protected: | 73 protected: |
| 72 // This class is a singleton. Do not instantiate directly. | 74 // This class is a singleton. Do not instantiate directly. |
| 73 BrowserAccessibilityManager(); | 75 BrowserAccessibilityManager(); |
| 74 friend struct DefaultSingletonTraits<BrowserAccessibilityManager>; | 76 friend struct DefaultSingletonTraits<BrowserAccessibilityManager>; |
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| 94 // Caching of the unique member variables used to handle browser accessibility | 96 // Caching of the unique member variables used to handle browser accessibility |
| 95 // requests from multiple processes. | 97 // requests from multiple processes. |
| 96 InstanceMap instance_map_; | 98 InstanceMap instance_map_; |
| 97 int instance_id_; | 99 int instance_id_; |
| 98 | 100 |
| 99 // Reverse mapping to track which RenderProcessHosts are active. If a | 101 // Reverse mapping to track which RenderProcessHosts are active. If a |
| 100 // RenderProcessHost is found to be terminated, it should be removed from this | 102 // RenderProcessHost is found to be terminated, it should be removed from this |
| 101 // mapping, and the connected BrowserAccessibility ids/instances invalidated. | 103 // mapping, and the connected BrowserAccessibility ids/instances invalidated. |
| 102 RenderProcessHostMap render_process_host_map_; | 104 RenderProcessHostMap render_process_host_map_; |
| 103 | 105 |
| 104 AccessibilityOutParams out_params_; | 106 webkit_glue::WebAccessibility::OutParams out_params_; |
| 105 | 107 |
| 106 DISALLOW_COPY_AND_ASSIGN(BrowserAccessibilityManager); | 108 DISALLOW_COPY_AND_ASSIGN(BrowserAccessibilityManager); |
| 107 }; | 109 }; |
| 108 #endif // CHROME_BROWSER_BROWSER_ACCESSIBILITY_MANAGER_H_ | 110 #endif // CHROME_BROWSER_BROWSER_ACCESSIBILITY_MANAGER_H_ |
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