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1 // Copyright 2014 The Chromium Authors. All rights reserved. | |
2 // Use of this source code is governed by a BSD-style license that can be | |
3 // found in the LICENSE file. | |
4 | |
5 #include "content/browser/accessibility/accessibility_event_recorder.h" | |
6 | |
7 #include <oleacc.h> | |
8 | |
9 #include <string> | |
10 | |
11 #include "base/strings/string_number_conversions.h" | |
12 #include "base/strings/string_util.h" | |
13 #include "base/strings/stringprintf.h" | |
14 #include "base/strings/utf_string_conversions.h" | |
15 #include "base/win/scoped_bstr.h" | |
16 #include "base/win/scoped_comptr.h" | |
17 #include "base/win/scoped_variant.h" | |
18 #include "content/browser/accessibility/accessibility_tree_formatter_utils_win.h
" | |
19 #include "content/browser/accessibility/browser_accessibility_manager.h" | |
20 #include "content/browser/accessibility/browser_accessibility_win.h" | |
21 #include "third_party/iaccessible2/ia2_api_all.h" | |
22 #include "ui/base/win/atl_module.h" | |
23 | |
24 namespace content { | |
25 | |
26 namespace { | |
27 | |
28 std::string RoleVariantToString(const base::win::ScopedVariant& role) { | |
29 if (role.type() == VT_I4) { | |
30 return base::UTF16ToUTF8(IAccessibleRoleToString(V_I4(&role))); | |
31 } else if (role.type() == VT_BSTR) { | |
32 return base::UTF16ToUTF8( | |
33 base::string16(V_BSTR(&role), SysStringLen(V_BSTR(&role)))); | |
34 } | |
35 return std::string(); | |
36 } | |
37 | |
38 HRESULT QueryIAccessible2(IAccessible* accessible, IAccessible2** accessible2) { | |
39 base::win::ScopedComPtr<IServiceProvider> service_provider; | |
40 HRESULT hr = accessible->QueryInterface(service_provider.Receive()); | |
41 return SUCCEEDED(hr) ? | |
42 service_provider->QueryService(IID_IAccessible2, accessible2) : hr; | |
43 } | |
44 | |
45 std::string BstrToUTF8(BSTR bstr) { | |
46 base::string16 str16(bstr, SysStringLen(bstr)); | |
47 return base::UTF16ToUTF8(str16); | |
48 } | |
49 | |
50 std::string AccessibilityEventToStringUTF8(int32 event_id) { | |
51 return base::UTF16ToUTF8(AccessibilityEventToString(event_id)); | |
52 } | |
53 | |
54 } // namespace | |
55 | |
56 class AccessibilityEventRecorderWin : public AccessibilityEventRecorder { | |
57 public: | |
58 explicit AccessibilityEventRecorderWin(BrowserAccessibilityManager* manager); | |
59 virtual ~AccessibilityEventRecorderWin(); | |
60 | |
61 // Callback registered by SetWinEventHook. Just calls OnWinEventHook. | |
62 static void CALLBACK WinEventHookThunk( | |
63 HWINEVENTHOOK handle, | |
64 DWORD event, | |
65 HWND hwnd, | |
66 LONG obj_id, | |
67 LONG child_id, | |
68 DWORD event_thread, | |
69 DWORD event_time); | |
70 | |
71 private: | |
72 // Called by the thunk registered by SetWinEventHook. Retrives accessibility | |
73 // info about the node the event was fired on and appends a string to | |
74 // the event log. | |
75 void OnWinEventHook(HWINEVENTHOOK handle, | |
76 DWORD event, | |
77 HWND hwnd, | |
78 LONG obj_id, | |
79 LONG child_id, | |
80 DWORD event_thread, | |
81 DWORD event_time); | |
82 | |
83 HWINEVENTHOOK win_event_hook_handle_; | |
84 static AccessibilityEventRecorderWin* instance_; | |
85 }; | |
86 | |
87 // static | |
88 AccessibilityEventRecorderWin* | |
89 AccessibilityEventRecorderWin::instance_ = nullptr; | |
90 | |
91 // static | |
92 AccessibilityEventRecorder* AccessibilityEventRecorder::Create( | |
93 BrowserAccessibilityManager* manager) { | |
94 return new AccessibilityEventRecorderWin(manager); | |
95 } | |
96 | |
97 // static | |
98 void CALLBACK AccessibilityEventRecorderWin::WinEventHookThunk( | |
99 HWINEVENTHOOK handle, | |
100 DWORD event, | |
101 HWND hwnd, | |
102 LONG obj_id, | |
103 LONG child_id, | |
104 DWORD event_thread, | |
105 DWORD event_time) { | |
106 if (instance_) { | |
107 instance_->OnWinEventHook(handle, event, hwnd, obj_id, child_id, | |
108 event_thread, event_time); | |
109 } | |
110 } | |
111 | |
112 AccessibilityEventRecorderWin::AccessibilityEventRecorderWin( | |
113 BrowserAccessibilityManager* manager) | |
114 : AccessibilityEventRecorder(manager) { | |
115 CHECK(!instance_) << "There can be only one instance of" | |
116 << " WinAccessibilityEventMonitor at a time."; | |
117 instance_ = this; | |
118 win_event_hook_handle_ = SetWinEventHook( | |
119 EVENT_MIN, | |
120 EVENT_MAX, | |
121 GetModuleHandle(NULL), | |
122 &AccessibilityEventRecorderWin::WinEventHookThunk, | |
123 GetCurrentProcessId(), | |
124 0, // Hook all threads | |
125 WINEVENT_INCONTEXT); | |
126 } | |
127 | |
128 AccessibilityEventRecorderWin::~AccessibilityEventRecorderWin() { | |
129 UnhookWinEvent(win_event_hook_handle_); | |
130 instance_ = NULL; | |
131 } | |
132 | |
133 void AccessibilityEventRecorderWin::OnWinEventHook( | |
134 HWINEVENTHOOK handle, | |
135 DWORD event, | |
136 HWND hwnd, | |
137 LONG obj_id, | |
138 LONG child_id, | |
139 DWORD event_thread, | |
140 DWORD event_time) { | |
141 base::win::ScopedComPtr<IAccessible> browser_accessible; | |
142 HRESULT hr = AccessibleObjectFromWindow( | |
143 hwnd, | |
144 obj_id, | |
145 IID_IAccessible, | |
146 reinterpret_cast<void**>(browser_accessible.Receive())); | |
147 CHECK(SUCCEEDED(hr)) << "Failure accessing accessible object from hwnd " | |
148 << hwnd << " obj_id=" << obj_id << " child_id=" | |
149 << child_id; | |
150 | |
151 base::win::ScopedVariant childid_variant(child_id); | |
152 base::win::ScopedComPtr<IDispatch> dispatch; | |
153 hr = browser_accessible->get_accChild(childid_variant, dispatch.Receive()); | |
154 CHECK(SUCCEEDED(hr)); | |
155 base::win::ScopedComPtr<IAccessible> iaccessible; | |
156 dispatch.QueryInterface(iaccessible.Receive()); | |
157 | |
158 base::win::ScopedVariant childid_self(CHILDID_SELF); | |
159 base::win::ScopedVariant role; | |
160 iaccessible->get_accRole(childid_self, role.Receive()); | |
161 base::win::ScopedBstr name_bstr; | |
162 iaccessible->get_accName(childid_self, name_bstr.Receive()); | |
163 base::win::ScopedBstr value_bstr; | |
164 iaccessible->get_accValue(childid_self, value_bstr.Receive()); | |
165 | |
166 std::string log = base::StringPrintf( | |
167 "%s on role=%s", | |
168 AccessibilityEventToStringUTF8(event).c_str(), | |
169 RoleVariantToString(role).c_str()); | |
170 if (name_bstr.Length() > 0) | |
171 log += base::StringPrintf(" name=\"%s\"", BstrToUTF8(name_bstr).c_str()); | |
172 if (value_bstr.Length() > 0) | |
173 log += base::StringPrintf(" value=\"%s\"", BstrToUTF8(value_bstr).c_str()); | |
174 | |
175 event_logs_.push_back(log); | |
176 } | |
177 | |
178 } // namespace content | |
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