1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
3 /* This Source Code Form is subject to the terms of the Mozilla Public
4 * License, v. 2.0. If a copy of the MPL was not distributed with this
5 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
6
7 #if defined(MOZILLA_INTERNAL_API)
8 #error This code is NOT for internal Gecko use!
9 #endif // defined(MOZILLA_INTERNAL_API)
10
11 #include "AccessibleHandlerControl.h"
12
13 #include "AccessibleHandler.h"
14
15 #include "AccessibleEventId.h"
16
17 #include "mozilla/Move.h"
18 #include "mozilla/RefPtr.h"
19
20 namespace mozilla {
21 namespace a11y {
22
23 mscom::SingletonFactory<AccessibleHandlerControl> gControlFactory;
24
25 namespace detail {
26
TextChange()27 TextChange::TextChange() : mIA2UniqueId(0), mIsInsert(false), mText() {}
28
TextChange(long aIA2UniqueId,bool aIsInsert,NotNull<IA2TextSegment * > aText)29 TextChange::TextChange(long aIA2UniqueId, bool aIsInsert,
30 NotNull<IA2TextSegment*> aText)
31 : mIA2UniqueId(aIA2UniqueId),
32 mIsInsert(aIsInsert),
33 mText{BSTRCopy(aText->text), aText->start, aText->end} {}
34
TextChange(TextChange && aOther)35 TextChange::TextChange(TextChange&& aOther) : mText() { *this = Move(aOther); }
36
TextChange(const TextChange & aOther)37 TextChange::TextChange(const TextChange& aOther) : mText() { *this = aOther; }
38
operator =(TextChange && aOther)39 TextChange& TextChange::operator=(TextChange&& aOther) {
40 mIA2UniqueId = aOther.mIA2UniqueId;
41 mIsInsert = aOther.mIsInsert;
42 aOther.mIA2UniqueId = 0;
43 ::SysFreeString(mText.text);
44 mText = aOther.mText;
45 aOther.mText.text = nullptr;
46 return *this;
47 }
48
operator =(const TextChange & aOther)49 TextChange& TextChange::operator=(const TextChange& aOther) {
50 mIA2UniqueId = aOther.mIA2UniqueId;
51 mIsInsert = aOther.mIsInsert;
52 ::SysFreeString(mText.text);
53 mText = {BSTRCopy(aOther.mText.text), aOther.mText.start, aOther.mText.end};
54 return *this;
55 }
56
~TextChange()57 TextChange::~TextChange() { ::SysFreeString(mText.text); }
58
59 HRESULT
GetOld(long aIA2UniqueId,NotNull<IA2TextSegment * > aOutOldSegment)60 TextChange::GetOld(long aIA2UniqueId, NotNull<IA2TextSegment*> aOutOldSegment) {
61 if (mIsInsert || aIA2UniqueId != mIA2UniqueId) {
62 return S_OK;
63 }
64
65 return SegCopy(*aOutOldSegment, mText);
66 }
67
68 HRESULT
GetNew(long aIA2UniqueId,NotNull<IA2TextSegment * > aOutNewSegment)69 TextChange::GetNew(long aIA2UniqueId, NotNull<IA2TextSegment*> aOutNewSegment) {
70 if (!mIsInsert || aIA2UniqueId != mIA2UniqueId) {
71 return S_OK;
72 }
73
74 return SegCopy(*aOutNewSegment, mText);
75 }
76
BSTRCopy(const BSTR & aIn)77 /* static */ BSTR TextChange::BSTRCopy(const BSTR& aIn) {
78 return ::SysAllocStringLen(aIn, ::SysStringLen(aIn));
79 }
80
SegCopy(IA2TextSegment & aDest,const IA2TextSegment & aSrc)81 /* static */ HRESULT TextChange::SegCopy(IA2TextSegment& aDest,
82 const IA2TextSegment& aSrc) {
83 aDest = {BSTRCopy(aSrc.text), aSrc.start, aSrc.end};
84 if (aSrc.text && !aDest.text) {
85 return E_OUTOFMEMORY;
86 }
87 if (!::SysStringLen(aDest.text)) {
88 return S_FALSE;
89 }
90 return S_OK;
91 }
92
93 } // namespace detail
94
95 HRESULT
Create(AccessibleHandlerControl ** aOutObject)96 AccessibleHandlerControl::Create(AccessibleHandlerControl** aOutObject) {
97 if (!aOutObject) {
98 return E_INVALIDARG;
99 }
100
101 RefPtr<AccessibleHandlerControl> ctl(new AccessibleHandlerControl());
102 ctl.forget(aOutObject);
103 return S_OK;
104 }
105
AccessibleHandlerControl()106 AccessibleHandlerControl::AccessibleHandlerControl()
107 : mIsRegistered(false),
108 mCacheGen(0),
109 mIA2Proxy(mscom::RegisterProxy(L"ia2marshal.dll")),
110 mHandlerProxy(mscom::RegisterProxy()) {
111 MOZ_ASSERT(mIA2Proxy);
112 }
113
IMPL_IUNKNOWN1(AccessibleHandlerControl,IHandlerControl)114 IMPL_IUNKNOWN1(AccessibleHandlerControl, IHandlerControl)
115
116 HRESULT
117 AccessibleHandlerControl::Invalidate() {
118 ++mCacheGen;
119 return S_OK;
120 }
121
122 HRESULT
OnTextChange(long aHwnd,long aIA2UniqueId,VARIANT_BOOL aIsInsert,IA2TextSegment * aText)123 AccessibleHandlerControl::OnTextChange(long aHwnd, long aIA2UniqueId,
124 VARIANT_BOOL aIsInsert,
125 IA2TextSegment* aText) {
126 if (!aText) {
127 return E_INVALIDARG;
128 }
129
130 mTextChange = detail::TextChange(aIA2UniqueId, aIsInsert, WrapNotNull(aText));
131 NotifyWinEvent(aIsInsert ? IA2_EVENT_TEXT_INSERTED : IA2_EVENT_TEXT_REMOVED,
132 reinterpret_cast<HWND>(static_cast<uintptr_t>(aHwnd)),
133 OBJID_CLIENT, aIA2UniqueId);
134 return S_OK;
135 }
136
137 HRESULT
GetNewText(long aIA2UniqueId,NotNull<IA2TextSegment * > aOutNewText)138 AccessibleHandlerControl::GetNewText(long aIA2UniqueId,
139 NotNull<IA2TextSegment*> aOutNewText) {
140 return mTextChange.GetNew(aIA2UniqueId, aOutNewText);
141 }
142
143 HRESULT
GetOldText(long aIA2UniqueId,NotNull<IA2TextSegment * > aOutOldText)144 AccessibleHandlerControl::GetOldText(long aIA2UniqueId,
145 NotNull<IA2TextSegment*> aOutOldText) {
146 return mTextChange.GetOld(aIA2UniqueId, aOutOldText);
147 }
148
149 HRESULT
GetHandlerTypeInfo(ITypeInfo ** aOutTypeInfo)150 AccessibleHandlerControl::GetHandlerTypeInfo(ITypeInfo** aOutTypeInfo) {
151 if (!mHandlerProxy) {
152 return E_UNEXPECTED;
153 }
154
155 return mHandlerProxy->GetTypeInfoForGuid(CLSID_AccessibleHandler,
156 aOutTypeInfo);
157 }
158
159 HRESULT
Register(NotNull<IGeckoBackChannel * > aGecko)160 AccessibleHandlerControl::Register(NotNull<IGeckoBackChannel*> aGecko) {
161 if (mIsRegistered) {
162 return S_OK;
163 }
164
165 long pid = static_cast<long>(::GetCurrentProcessId());
166 HRESULT hr = aGecko->put_HandlerControl(pid, this);
167 mIsRegistered = SUCCEEDED(hr);
168 MOZ_ASSERT(mIsRegistered);
169 return hr;
170 }
171
172 } // namespace a11y
173 } // namespace mozilla
174