1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
|
/*
* Copyright (C) 2008 Apple Inc. All Rights Reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "AccessibilityController.h"
#include "AccessibilityUIElement.h"
#include "DumpRenderTree.h"
#include <JavaScriptCore/Assertions.h>
#include <WebCore/COMPtr.h>
#include <WebKit/WebKit.h>
#include <oleacc.h>
#include <string>
using namespace std;
AccessibilityController::AccessibilityController()
: m_focusEventHook(0)
, m_scrollingStartEventHook(0)
{
}
AccessibilityController::~AccessibilityController()
{
setLogFocusEvents(false);
}
AccessibilityUIElement AccessibilityController::focusedElement()
{
COMPtr<IAccessible> rootAccessible = rootElement().platformUIElement();
VARIANT vFocus;
if (FAILED(rootAccessible->get_accFocus(&vFocus)))
return 0;
if (V_VT(&vFocus) == VT_I4) {
ASSERT(V_I4(&vFocus) == CHILDID_SELF);
// The root accessible object is the focused object.
return rootAccessible;
}
ASSERT(V_VT(&vFocus) == VT_DISPATCH);
// We have an IDispatch; query for IAccessible.
return COMPtr<IAccessible>(Query, V_DISPATCH(&vFocus));
}
AccessibilityUIElement AccessibilityController::rootElement()
{
COMPtr<IWebView> view;
if (FAILED(frame->webView(&view)))
return 0;
COMPtr<IWebViewPrivate> viewPrivate(Query, view);
if (!viewPrivate)
return 0;
HWND webViewWindow;
if (FAILED(viewPrivate->viewWindow((OLE_HANDLE*)&webViewWindow)))
return 0;
// Get the root accessible object by querying for the accessible object for the
// WebView's window.
COMPtr<IAccessible> rootAccessible;
if (FAILED(AccessibleObjectFromWindow(webViewWindow, static_cast<DWORD>(OBJID_CLIENT), __uuidof(IAccessible), reinterpret_cast<void**>(&rootAccessible))))
return 0;
return rootAccessible;
}
static void CALLBACK logEventProc(HWINEVENTHOOK hWinEventHook, DWORD event, HWND hwnd, LONG idObject, LONG idChild, DWORD, DWORD)
{
// Get the accessible object for this event.
COMPtr<IAccessible> parentObject;
VARIANT vChild;
VariantInit(&vChild);
HRESULT hr = AccessibleObjectFromEvent(hwnd, idObject, idChild, &parentObject, &vChild);
ASSERT(SUCCEEDED(hr));
// Get the name of the focused element, and log it to stdout.
BSTR nameBSTR;
hr = parentObject->get_accName(vChild, &nameBSTR);
ASSERT(SUCCEEDED(hr));
wstring name(nameBSTR, ::SysStringLen(nameBSTR));
SysFreeString(nameBSTR);
switch (event) {
case EVENT_OBJECT_FOCUS:
printf("Received focus event for object '%S'.\n", name.c_str());
break;
case EVENT_SYSTEM_SCROLLINGSTART:
printf("Received scrolling start event for object '%S'.\n", name.c_str());
break;
default:
printf("Received unknown event for object '%S'.\n", name.c_str());
break;
}
}
void AccessibilityController::setLogFocusEvents(bool logFocusEvents)
{
if (!!m_focusEventHook == logFocusEvents)
return;
if (!logFocusEvents) {
UnhookWinEvent(m_focusEventHook);
m_focusEventHook = 0;
return;
}
// Ensure that accessibility is initialized for the WebView by querying for
// the root accessible object.
rootElement();
m_focusEventHook = SetWinEventHook(EVENT_OBJECT_FOCUS, EVENT_OBJECT_FOCUS, GetModuleHandle(0), logEventProc, GetCurrentProcessId(), 0, WINEVENT_INCONTEXT);
ASSERT(m_focusEventHook);
}
void AccessibilityController::setLogScrollingStartEvents(bool logScrollingStartEvents)
{
if (!!m_scrollingStartEventHook == logScrollingStartEvents)
return;
if (!logScrollingStartEvents) {
UnhookWinEvent(m_scrollingStartEventHook);
m_scrollingStartEventHook = 0;
return;
}
// Ensure that accessibility is initialized for the WebView by querying for
// the root accessible object.
rootElement();
m_scrollingStartEventHook = SetWinEventHook(EVENT_SYSTEM_SCROLLINGSTART, EVENT_SYSTEM_SCROLLINGSTART, GetModuleHandle(0), logEventProc, GetCurrentProcessId(), 0, WINEVENT_INCONTEXT);
ASSERT(m_scrollingStartEventHook);
}
|
