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Diffstat (limited to '')
| -rw-r--r-- | accessible/windows/ia2/ia2Accessible.cpp | 632 |
1 files changed, 632 insertions, 0 deletions
diff --git a/accessible/windows/ia2/ia2Accessible.cpp b/accessible/windows/ia2/ia2Accessible.cpp new file mode 100644 index 0000000000..b042e41913 --- /dev/null +++ b/accessible/windows/ia2/ia2Accessible.cpp @@ -0,0 +1,632 @@ +/* -*- 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 "Accessible2_i.c" +#include "Accessible2_2_i.c" +#include "Accessible2_3_i.c" +#include "AccessibleRole.h" +#include "AccessibleStates.h" + +#include "Compatibility.h" +#include "ia2AccessibleRelation.h" +#include "IUnknownImpl.h" +#include "nsCoreUtils.h" +#include "nsIAccessibleTypes.h" +#include "mozilla/a11y/PDocAccessible.h" +#include "Relation.h" +#include "TextRange-inl.h" +#include "nsAccessibilityService.h" + +#include "mozilla/PresShell.h" +#include "nsIPersistentProperties2.h" +#include "nsISimpleEnumerator.h" + +using namespace mozilla; +using namespace mozilla::a11y; + +template <typename String> +static void EscapeAttributeChars(String& aStr); + +//////////////////////////////////////////////////////////////////////////////// +// ia2Accessible +//////////////////////////////////////////////////////////////////////////////// + +STDMETHODIMP +ia2Accessible::QueryInterface(REFIID iid, void** ppv) { + if (!ppv) return E_INVALIDARG; + + *ppv = nullptr; + + // NOTE: If any new versions of IAccessible2 are added here, they should + // also be added to the IA2 Handler in + // /accessible/ipc/win/handler/AccessibleHandler.cpp + + if (IID_IAccessible2_3 == iid) + *ppv = static_cast<IAccessible2_3*>(this); + else if (IID_IAccessible2_2 == iid) + *ppv = static_cast<IAccessible2_2*>(this); + else if (IID_IAccessible2 == iid) + *ppv = static_cast<IAccessible2*>(this); + + if (*ppv) { + (reinterpret_cast<IUnknown*>(*ppv))->AddRef(); + return S_OK; + } + + return E_NOINTERFACE; +} + +//////////////////////////////////////////////////////////////////////////////// +// IAccessible2 + +STDMETHODIMP +ia2Accessible::get_nRelations(long* aNRelations) { + if (!aNRelations) return E_INVALIDARG; + *aNRelations = 0; + + AccessibleWrap* acc = static_cast<AccessibleWrap*>(this); + if (acc->IsDefunct()) return CO_E_OBJNOTCONNECTED; + + MOZ_ASSERT(!acc->IsProxy()); + + for (uint32_t idx = 0; idx < ArrayLength(sRelationTypePairs); idx++) { + if (sRelationTypePairs[idx].second == IA2_RELATION_NULL) continue; + + Relation rel = acc->RelationByType(sRelationTypePairs[idx].first); + if (rel.Next()) (*aNRelations)++; + } + return S_OK; +} + +STDMETHODIMP +ia2Accessible::get_relation(long aRelationIndex, + IAccessibleRelation** aRelation) { + if (!aRelation || aRelationIndex < 0) return E_INVALIDARG; + *aRelation = nullptr; + + AccessibleWrap* acc = static_cast<AccessibleWrap*>(this); + if (acc->IsDefunct()) return CO_E_OBJNOTCONNECTED; + + MOZ_ASSERT(!acc->IsProxy()); + + long relIdx = 0; + for (uint32_t idx = 0; idx < ArrayLength(sRelationTypePairs); idx++) { + if (sRelationTypePairs[idx].second == IA2_RELATION_NULL) continue; + + RelationType relationType = sRelationTypePairs[idx].first; + Relation rel = acc->RelationByType(relationType); + RefPtr<ia2AccessibleRelation> ia2Relation = + new ia2AccessibleRelation(relationType, &rel); + if (ia2Relation->HasTargets()) { + if (relIdx == aRelationIndex) { + acc->AssociateCOMObjectForDisconnection(ia2Relation); + ia2Relation.forget(aRelation); + return S_OK; + } + + relIdx++; + } + } + + return E_INVALIDARG; +} + +STDMETHODIMP +ia2Accessible::get_relations(long aMaxRelations, + IAccessibleRelation** aRelation, + long* aNRelations) { + if (!aRelation || !aNRelations || aMaxRelations <= 0) return E_INVALIDARG; + *aNRelations = 0; + + AccessibleWrap* acc = static_cast<AccessibleWrap*>(this); + if (acc->IsDefunct()) return CO_E_OBJNOTCONNECTED; + + MOZ_ASSERT(!acc->IsProxy()); + + for (uint32_t idx = 0; + idx < ArrayLength(sRelationTypePairs) && *aNRelations < aMaxRelations; + idx++) { + if (sRelationTypePairs[idx].second == IA2_RELATION_NULL) continue; + + RelationType relationType = sRelationTypePairs[idx].first; + Relation rel = acc->RelationByType(relationType); + RefPtr<ia2AccessibleRelation> ia2Rel = + new ia2AccessibleRelation(relationType, &rel); + if (ia2Rel->HasTargets()) { + acc->AssociateCOMObjectForDisconnection(ia2Rel); + ia2Rel.forget(aRelation + (*aNRelations)); + (*aNRelations)++; + } + } + return S_OK; +} + +STDMETHODIMP +ia2Accessible::role(long* aRole) { + if (!aRole) return E_INVALIDARG; + *aRole = 0; + + AccessibleWrap* acc = static_cast<AccessibleWrap*>(this); + if (acc->IsDefunct()) return CO_E_OBJNOTCONNECTED; + +#define ROLE(_geckoRole, stringRole, atkRole, macRole, macSubrole, msaaRole, \ + ia2Role, androidClass, nameRule) \ + case roles::_geckoRole: \ + *aRole = ia2Role; \ + break; + + a11y::role geckoRole; + MOZ_ASSERT(!acc->IsProxy()); + geckoRole = acc->Role(); + switch (geckoRole) { +#include "RoleMap.h" + default: + MOZ_CRASH("Unknown role."); + } + +#undef ROLE + + // Special case, if there is a ROLE_ROW inside of a ROLE_TREE_TABLE, then call + // the IA2 role a ROLE_OUTLINEITEM. + MOZ_ASSERT(!acc->IsProxy()); + if (geckoRole == roles::ROW) { + Accessible* xpParent = acc->Parent(); + if (xpParent && xpParent->Role() == roles::TREE_TABLE) + *aRole = ROLE_SYSTEM_OUTLINEITEM; + } + + return S_OK; +} + +// XXX Use MOZ_CAN_RUN_SCRIPT_BOUNDARY for now due to bug 1543294. +MOZ_CAN_RUN_SCRIPT_BOUNDARY STDMETHODIMP +ia2Accessible::scrollTo(enum IA2ScrollType aScrollType) { + AccessibleWrap* acc = static_cast<AccessibleWrap*>(this); + if (acc->IsDefunct()) return CO_E_OBJNOTCONNECTED; + + MOZ_ASSERT(!acc->IsProxy()); + RefPtr<PresShell> presShell = acc->Document()->PresShellPtr(); + nsCOMPtr<nsIContent> content = acc->GetContent(); + nsCoreUtils::ScrollTo(presShell, content, aScrollType); + + return S_OK; +} + +STDMETHODIMP +ia2Accessible::scrollToPoint(enum IA2CoordinateType aCoordType, long aX, + long aY) { + AccessibleWrap* acc = static_cast<AccessibleWrap*>(this); + if (acc->IsDefunct()) return CO_E_OBJNOTCONNECTED; + + uint32_t geckoCoordType = + (aCoordType == IA2_COORDTYPE_SCREEN_RELATIVE) + ? nsIAccessibleCoordinateType::COORDTYPE_SCREEN_RELATIVE + : nsIAccessibleCoordinateType::COORDTYPE_PARENT_RELATIVE; + + MOZ_ASSERT(!acc->IsProxy()); + acc->ScrollToPoint(geckoCoordType, aX, aY); + + return S_OK; +} + +STDMETHODIMP +ia2Accessible::get_groupPosition(long* aGroupLevel, long* aSimilarItemsInGroup, + long* aPositionInGroup) { + if (!aGroupLevel || !aSimilarItemsInGroup || !aPositionInGroup) + return E_INVALIDARG; + + *aGroupLevel = 0; + *aSimilarItemsInGroup = 0; + *aPositionInGroup = 0; + + AccessibleWrap* acc = static_cast<AccessibleWrap*>(this); + if (acc->IsDefunct()) return CO_E_OBJNOTCONNECTED; + + GroupPos groupPos = acc->GroupPosition(); + + // Group information for accessibles having level only (like html headings + // elements) isn't exposed by this method. AT should look for 'level' object + // attribute. + if (!groupPos.setSize && !groupPos.posInSet) return S_FALSE; + + *aGroupLevel = groupPos.level; + *aSimilarItemsInGroup = groupPos.setSize; + *aPositionInGroup = groupPos.posInSet; + + return S_OK; +} + +STDMETHODIMP +ia2Accessible::get_states(AccessibleStates* aStates) { + if (!aStates) return E_INVALIDARG; + *aStates = 0; + + // XXX: bug 344674 should come with better approach that we have here. + + AccessibleWrap* acc = static_cast<AccessibleWrap*>(this); + if (acc->IsDefunct()) { + *aStates = IA2_STATE_DEFUNCT; + return S_OK; + } + + uint64_t state; + MOZ_ASSERT(!acc->IsProxy()); + state = acc->State(); + + if (state & states::INVALID) *aStates |= IA2_STATE_INVALID_ENTRY; + if (state & states::REQUIRED) *aStates |= IA2_STATE_REQUIRED; + + // The following IA2 states are not supported by Gecko + // IA2_STATE_ARMED + // IA2_STATE_MANAGES_DESCENDANTS + // IA2_STATE_ICONIFIED + // IA2_STATE_INVALID // This is not a state, it is the absence of a state + + if (state & states::ACTIVE) *aStates |= IA2_STATE_ACTIVE; + if (state & states::DEFUNCT) *aStates |= IA2_STATE_DEFUNCT; + if (state & states::EDITABLE) *aStates |= IA2_STATE_EDITABLE; + if (state & states::HORIZONTAL) *aStates |= IA2_STATE_HORIZONTAL; + if (state & states::MODAL) *aStates |= IA2_STATE_MODAL; + if (state & states::MULTI_LINE) *aStates |= IA2_STATE_MULTI_LINE; + if (state & states::OPAQUE1) *aStates |= IA2_STATE_OPAQUE; + if (state & states::SELECTABLE_TEXT) *aStates |= IA2_STATE_SELECTABLE_TEXT; + if (state & states::SINGLE_LINE) *aStates |= IA2_STATE_SINGLE_LINE; + if (state & states::STALE) *aStates |= IA2_STATE_STALE; + if (state & states::SUPPORTS_AUTOCOMPLETION) + *aStates |= IA2_STATE_SUPPORTS_AUTOCOMPLETION; + if (state & states::TRANSIENT) *aStates |= IA2_STATE_TRANSIENT; + if (state & states::VERTICAL) *aStates |= IA2_STATE_VERTICAL; + if (state & states::CHECKED) *aStates |= IA2_STATE_CHECKABLE; + if (state & states::PINNED) *aStates |= IA2_STATE_PINNED; + + return S_OK; +} + +STDMETHODIMP +ia2Accessible::get_extendedRole(BSTR* aExtendedRole) { + if (!aExtendedRole) return E_INVALIDARG; + + *aExtendedRole = nullptr; + return E_NOTIMPL; +} + +STDMETHODIMP +ia2Accessible::get_localizedExtendedRole(BSTR* aLocalizedExtendedRole) { + if (!aLocalizedExtendedRole) return E_INVALIDARG; + + *aLocalizedExtendedRole = nullptr; + return E_NOTIMPL; +} + +STDMETHODIMP +ia2Accessible::get_nExtendedStates(long* aNExtendedStates) { + if (!aNExtendedStates) return E_INVALIDARG; + + *aNExtendedStates = 0; + return E_NOTIMPL; +} + +STDMETHODIMP +ia2Accessible::get_extendedStates(long aMaxExtendedStates, + BSTR** aExtendedStates, + long* aNExtendedStates) { + if (!aExtendedStates || !aNExtendedStates) return E_INVALIDARG; + + *aExtendedStates = nullptr; + *aNExtendedStates = 0; + return E_NOTIMPL; +} + +STDMETHODIMP +ia2Accessible::get_localizedExtendedStates(long aMaxLocalizedExtendedStates, + BSTR** aLocalizedExtendedStates, + long* aNLocalizedExtendedStates) { + if (!aLocalizedExtendedStates || !aNLocalizedExtendedStates) + return E_INVALIDARG; + + *aLocalizedExtendedStates = nullptr; + *aNLocalizedExtendedStates = 0; + return E_NOTIMPL; +} + +STDMETHODIMP +ia2Accessible::get_uniqueID(long* aUniqueID) { + if (!aUniqueID) return E_INVALIDARG; + + AccessibleWrap* acc = static_cast<AccessibleWrap*>(this); + *aUniqueID = AccessibleWrap::GetChildIDFor(acc); + return S_OK; +} + +STDMETHODIMP +ia2Accessible::get_windowHandle(HWND* aWindowHandle) { + if (!aWindowHandle) return E_INVALIDARG; + *aWindowHandle = 0; + + AccessibleWrap* acc = static_cast<AccessibleWrap*>(this); + if (acc->IsDefunct()) return CO_E_OBJNOTCONNECTED; + + *aWindowHandle = AccessibleWrap::GetHWNDFor(acc); + return S_OK; +} + +STDMETHODIMP +ia2Accessible::get_indexInParent(long* aIndexInParent) { + if (!aIndexInParent) return E_INVALIDARG; + *aIndexInParent = -1; + + AccessibleWrap* acc = static_cast<AccessibleWrap*>(this); + if (acc->IsDefunct()) return CO_E_OBJNOTCONNECTED; + + MOZ_ASSERT(!acc->IsProxy()); + *aIndexInParent = acc->IndexInParent(); + + if (*aIndexInParent == -1) return S_FALSE; + + return S_OK; +} + +STDMETHODIMP +ia2Accessible::get_locale(IA2Locale* aLocale) { + if (!aLocale) return E_INVALIDARG; + + // Language codes consist of a primary code and a possibly empty series of + // subcodes: language-code = primary-code ( "-" subcode )* + // Two-letter primary codes are reserved for [ISO639] language abbreviations. + // Any two-letter subcode is understood to be a [ISO3166] country code. + + AccessibleWrap* acc = static_cast<AccessibleWrap*>(this); + if (acc->IsDefunct()) return CO_E_OBJNOTCONNECTED; + + nsAutoString lang; + acc->Language(lang); + + // If primary code consists from two letters then expose it as language. + int32_t offset = lang.FindChar('-', 0); + if (offset == -1) { + if (lang.Length() == 2) { + aLocale->language = ::SysAllocString(lang.get()); + return S_OK; + } + } else if (offset == 2) { + aLocale->language = ::SysAllocStringLen(lang.get(), 2); + + // If the first subcode consists from two letters then expose it as + // country. + offset = lang.FindChar('-', 3); + if (offset == -1) { + if (lang.Length() == 5) { + aLocale->country = ::SysAllocString(lang.get() + 3); + return S_OK; + } + } else if (offset == 5) { + aLocale->country = ::SysAllocStringLen(lang.get() + 3, 2); + } + } + + // Expose as a string if primary code or subcode cannot point to language or + // country abbreviations or if there are more than one subcode. + aLocale->variant = ::SysAllocString(lang.get()); + return S_OK; +} + +STDMETHODIMP +ia2Accessible::get_attributes(BSTR* aAttributes) { + if (!aAttributes) return E_INVALIDARG; + *aAttributes = nullptr; + + AccessibleWrap* acc = static_cast<AccessibleWrap*>(this); + if (acc->IsDefunct()) return CO_E_OBJNOTCONNECTED; + + // The format is name:value;name:value; with \ for escaping these + // characters ":;=,\". + if (!acc->IsProxy()) { + nsCOMPtr<nsIPersistentProperties> attributes = acc->Attributes(); + return ConvertToIA2Attributes(attributes, aAttributes); + } + + MOZ_ASSERT(!acc->IsProxy()); + return E_UNEXPECTED; +} + +//////////////////////////////////////////////////////////////////////////////// +// IAccessible2_2 + +STDMETHODIMP +ia2Accessible::get_attribute(BSTR name, VARIANT* aAttribute) { + if (!aAttribute) return E_INVALIDARG; + + return E_NOTIMPL; +} + +STDMETHODIMP +ia2Accessible::get_accessibleWithCaret(IUnknown** aAccessible, + long* aCaretOffset) { + if (!aAccessible || !aCaretOffset) return E_INVALIDARG; + + *aAccessible = nullptr; + *aCaretOffset = -1; + + AccessibleWrap* acc = static_cast<AccessibleWrap*>(this); + if (acc->IsDefunct()) return CO_E_OBJNOTCONNECTED; + + int32_t caretOffset = -1; + Accessible* accWithCaret = SelectionMgr()->AccessibleWithCaret(&caretOffset); + if (!accWithCaret || acc->Document() != accWithCaret->Document()) + return S_FALSE; + + Accessible* child = accWithCaret; + while (!child->IsDoc() && child != acc) child = child->Parent(); + + if (child != acc) return S_FALSE; + + *aAccessible = + static_cast<IAccessible2*>(static_cast<AccessibleWrap*>(accWithCaret)); + (*aAccessible)->AddRef(); + *aCaretOffset = caretOffset; + return S_OK; +} + +STDMETHODIMP +ia2Accessible::get_relationTargetsOfType(BSTR aType, long aMaxTargets, + IUnknown*** aTargets, + long* aNTargets) { + if (!aTargets || !aNTargets || aMaxTargets < 0) return E_INVALIDARG; + *aNTargets = 0; + + Maybe<RelationType> relationType; + for (uint32_t idx = 0; idx < ArrayLength(sRelationTypePairs); idx++) { + if (wcscmp(aType, sRelationTypePairs[idx].second) == 0) { + relationType.emplace(sRelationTypePairs[idx].first); + break; + } + } + if (!relationType) return E_INVALIDARG; + + AccessibleWrap* acc = static_cast<AccessibleWrap*>(this); + if (acc->IsDefunct()) return CO_E_OBJNOTCONNECTED; + + nsTArray<Accessible*> targets; + MOZ_ASSERT(!acc->IsProxy()); + Relation rel = acc->RelationByType(*relationType); + Accessible* target = nullptr; + while ( + (target = rel.Next()) && + (aMaxTargets == 0 || static_cast<long>(targets.Length()) < aMaxTargets)) { + targets.AppendElement(target); + } + + *aNTargets = targets.Length(); + *aTargets = + static_cast<IUnknown**>(::CoTaskMemAlloc(sizeof(IUnknown*) * *aNTargets)); + if (!*aTargets) return E_OUTOFMEMORY; + + for (int32_t i = 0; i < *aNTargets; i++) { + AccessibleWrap* target = static_cast<AccessibleWrap*>(targets[i]); + (*aTargets)[i] = static_cast<IAccessible2*>(target); + (*aTargets)[i]->AddRef(); + } + + return S_OK; +} + +STDMETHODIMP +ia2Accessible::get_selectionRanges(IA2Range** aRanges, long* aNRanges) { + if (!aRanges || !aNRanges) return E_INVALIDARG; + + *aNRanges = 0; + + AccessibleWrap* acc = static_cast<AccessibleWrap*>(this); + if (acc->IsDefunct()) return CO_E_OBJNOTCONNECTED; + + AutoTArray<TextRange, 1> ranges; + acc->Document()->SelectionRanges(&ranges); + ranges.RemoveElementsBy([acc](auto& range) { return !range.Crop(acc); }); + + *aNRanges = ranges.Length(); + *aRanges = + static_cast<IA2Range*>(::CoTaskMemAlloc(sizeof(IA2Range) * *aNRanges)); + if (!*aRanges) return E_OUTOFMEMORY; + + for (uint32_t idx = 0; idx < static_cast<uint32_t>(*aNRanges); idx++) { + AccessibleWrap* anchor = + static_cast<AccessibleWrap*>(ranges[idx].StartContainer()); + (*aRanges)[idx].anchor = static_cast<IAccessible2*>(anchor); + anchor->AddRef(); + + (*aRanges)[idx].anchorOffset = ranges[idx].StartOffset(); + + AccessibleWrap* active = + static_cast<AccessibleWrap*>(ranges[idx].EndContainer()); + (*aRanges)[idx].active = static_cast<IAccessible2*>(active); + active->AddRef(); + + (*aRanges)[idx].activeOffset = ranges[idx].EndOffset(); + } + + return S_OK; +} + +//////////////////////////////////////////////////////////////////////////////// +// Helpers + +template <typename String> +static inline void EscapeAttributeChars(String& aStr) { + int32_t offset = 0; + static const char kCharsToEscape[] = ":;=,\\"; + while ((offset = aStr.FindCharInSet(kCharsToEscape, offset)) != kNotFound) { + aStr.Insert('\\', offset); + offset += 2; + } +} + +HRESULT +ia2Accessible::ConvertToIA2Attributes(nsTArray<Attribute>* aAttributes, + BSTR* aIA2Attributes) { + nsString attrStr; + size_t attrCount = aAttributes->Length(); + for (size_t i = 0; i < attrCount; i++) { + EscapeAttributeChars(aAttributes->ElementAt(i).Name()); + EscapeAttributeChars(aAttributes->ElementAt(i).Value()); + AppendUTF8toUTF16(aAttributes->ElementAt(i).Name(), attrStr); + attrStr.Append(':'); + attrStr.Append(aAttributes->ElementAt(i).Value()); + attrStr.Append(';'); + } + + if (attrStr.IsEmpty()) return S_FALSE; + + *aIA2Attributes = ::SysAllocStringLen(attrStr.get(), attrStr.Length()); + return *aIA2Attributes ? S_OK : E_OUTOFMEMORY; +} + +HRESULT +ia2Accessible::ConvertToIA2Attributes(nsIPersistentProperties* aAttributes, + BSTR* aIA2Attributes) { + *aIA2Attributes = nullptr; + + // The format is name:value;name:value; with \ for escaping these + // characters ":;=,\". + + if (!aAttributes) return S_FALSE; + + nsCOMPtr<nsISimpleEnumerator> propEnum; + aAttributes->Enumerate(getter_AddRefs(propEnum)); + if (!propEnum) return E_FAIL; + + nsAutoString strAttrs; + + bool hasMore = false; + while (NS_SUCCEEDED(propEnum->HasMoreElements(&hasMore)) && hasMore) { + nsCOMPtr<nsISupports> propSupports; + propEnum->GetNext(getter_AddRefs(propSupports)); + + nsCOMPtr<nsIPropertyElement> propElem(do_QueryInterface(propSupports)); + if (!propElem) return E_FAIL; + + nsAutoCString name; + if (NS_FAILED(propElem->GetKey(name))) return E_FAIL; + + EscapeAttributeChars(name); + + nsAutoString value; + if (NS_FAILED(propElem->GetValue(value))) return E_FAIL; + + EscapeAttributeChars(value); + + AppendUTF8toUTF16(name, strAttrs); + strAttrs.Append(':'); + strAttrs.Append(value); + strAttrs.Append(';'); + } + + if (strAttrs.IsEmpty()) return S_FALSE; + + *aIA2Attributes = ::SysAllocStringLen(strAttrs.get(), strAttrs.Length()); + return *aIA2Attributes ? S_OK : E_OUTOFMEMORY; +} |