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
|
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "AccessibleWrap.h"
#include "mozilla/a11y/DocAccessibleParent.h"
#include "AccEvent.h"
#include "nsAccUtils.h"
#include "nsIAccessibleEvent.h"
#include "nsIWidget.h"
#include "nsWindowsHelpers.h"
#include "mozilla/a11y/HyperTextAccessible.h"
#include "mozilla/a11y/RemoteAccessible.h"
#include "ServiceProvider.h"
#include "sdnAccessible.h"
#include "LocalAccessible-inl.h"
using namespace mozilla;
using namespace mozilla::a11y;
/* For documentation of the accessibility architecture,
* see http://lxr.mozilla.org/seamonkey/source/accessible/accessible-docs.html
*/
////////////////////////////////////////////////////////////////////////////////
// AccessibleWrap
////////////////////////////////////////////////////////////////////////////////
AccessibleWrap::AccessibleWrap(nsIContent* aContent, DocAccessible* aDoc)
: LocalAccessible(aContent, aDoc) {}
NS_IMPL_ISUPPORTS_INHERITED0(AccessibleWrap, LocalAccessible)
void AccessibleWrap::Shutdown() {
if (mMsaa) {
mMsaa->MsaaShutdown();
// Don't release mMsaa here because this will cause its id to be released
// immediately, which will result in immediate reuse, causing problems
// for clients. Instead, we release it in the destructor.
}
LocalAccessible::Shutdown();
}
//-----------------------------------------------------
// IUnknown interface methods - see iunknown.h for documentation
//-----------------------------------------------------
MsaaAccessible* AccessibleWrap::GetMsaa() {
if (!mMsaa) {
mMsaa = MsaaAccessible::Create(this);
}
return mMsaa;
}
void AccessibleWrap::GetNativeInterface(void** aOutAccessible) {
RefPtr<IAccessible> result = GetMsaa();
return result.forget(aOutAccessible);
}
////////////////////////////////////////////////////////////////////////////////
// AccessibleWrap
//------- Helper methods ---------
bool AccessibleWrap::IsRootForHWND() {
if (IsRoot()) {
return true;
}
HWND thisHwnd = MsaaAccessible::GetHWNDFor(this);
AccessibleWrap* parent = static_cast<AccessibleWrap*>(LocalParent());
MOZ_ASSERT(parent);
HWND parentHwnd = MsaaAccessible::GetHWNDFor(parent);
return thisHwnd != parentHwnd;
}
/* static */
void AccessibleWrap::UpdateSystemCaretFor(
Accessible* aAccessible, const LayoutDeviceIntRect& aCaretRect) {
if (LocalAccessible* localAcc = aAccessible->AsLocal()) {
// XXX We need the widget for LocalAccessible, so we have to call
// HyperTextAccessible::GetCaretRect. We should find some way of avoiding
// the need for the widget.
UpdateSystemCaretFor(localAcc);
} else {
UpdateSystemCaretFor(aAccessible->AsRemote(), aCaretRect);
}
}
/* static */
void AccessibleWrap::UpdateSystemCaretFor(LocalAccessible* aAccessible) {
// Move the system caret so that Windows Tablet Edition and tradional ATs with
// off-screen model can follow the caret
::DestroyCaret();
HyperTextAccessible* text = aAccessible->AsHyperText();
if (!text) return;
nsIWidget* widget = nullptr;
LayoutDeviceIntRect caretRect = text->GetCaretRect(&widget);
if (!widget) {
return;
}
HWND caretWnd =
reinterpret_cast<HWND>(widget->GetNativeData(NS_NATIVE_WINDOW));
UpdateSystemCaretFor(caretWnd, caretRect);
}
/* static */
void AccessibleWrap::UpdateSystemCaretFor(
RemoteAccessible* aProxy, const LayoutDeviceIntRect& aCaretRect) {
::DestroyCaret();
// The HWND should be the real widget HWND, not an emulated HWND.
// We get the HWND from the proxy's outer doc to bypass window emulation.
LocalAccessible* outerDoc = aProxy->OuterDocOfRemoteBrowser();
UpdateSystemCaretFor(MsaaAccessible::GetHWNDFor(outerDoc), aCaretRect);
}
/* static */
void AccessibleWrap::UpdateSystemCaretFor(
HWND aCaretWnd, const LayoutDeviceIntRect& aCaretRect) {
if (!aCaretWnd || aCaretRect.IsEmpty()) {
return;
}
// Create invisible bitmap for caret, otherwise its appearance interferes
// with Gecko caret
nsAutoBitmap caretBitMap(CreateBitmap(1, aCaretRect.Height(), 1, 1, nullptr));
if (::CreateCaret(aCaretWnd, caretBitMap, 1,
aCaretRect.Height())) { // Also destroys the last caret
::ShowCaret(aCaretWnd);
POINT clientPoint{aCaretRect.X(), aCaretRect.Y()};
::ScreenToClient(aCaretWnd, &clientPoint);
::SetCaretPos(clientPoint.x, clientPoint.y);
}
}
|
