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firefox/accessible/windows/msaa/MsaaAccessible.cpp
Daniel Baumann 5e9a113729
Adding upstream version 140.0. 
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
2025-06-25 09:37:52 +02:00

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/* -*- 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 "EnumVariant.h"
#include "ia2AccessibleApplication.h"
#include "ia2AccessibleHypertext.h"
#include "ia2AccessibleImage.h"
#include "ia2AccessibleTable.h"
#include "ia2AccessibleTableCell.h"
#include "LocalAccessible-inl.h"
#include "mozilla/a11y/AccessibleWrap.h"
#include "mozilla/a11y/Compatibility.h"
#include "mozilla/a11y/DocAccessibleParent.h"
#include "MsaaAccessible.h"
#include "MsaaDocAccessible.h"
#include "MsaaRootAccessible.h"
#include "MsaaXULMenuAccessible.h"
#include "nsEventMap.h"
#include "nsViewManager.h"
#include "nsWinUtils.h"
#include "Relation.h"
#include "sdnAccessible.h"
#include "HyperTextAccessible-inl.h"
#include "ServiceProvider.h"
#include "ARIAMap.h"
#include "mozilla/PresShell.h"
using namespace mozilla;
using namespace mozilla::a11y;
static const VARIANT kVarChildIdSelf = {{{VT_I4}}};
// Used internally to safely get an MsaaAccessible from a COM pointer provided
// to us by a client.
static const GUID IID_MsaaAccessible = {
/* a94aded3-1a9c-4afc-a32c-d6b5c010046b */
0xa94aded3,
0x1a9c,
0x4afc,
{0xa3, 0x2c, 0xd6, 0xb5, 0xc0, 0x10, 0x04, 0x6b}};
MOZ_RUNINIT MsaaIdGenerator MsaaAccessible::sIDGen;
ITypeInfo* MsaaAccessible::gTypeInfo = nullptr;
/* static */
MsaaAccessible* MsaaAccessible::Create(Accessible* aAcc) {
// This should only ever be called in the parent process.
MOZ_ASSERT(XRE_IsParentProcess());
// The order of some of these is important! For example, when isRoot is true,
// IsDoc will also be true, so we must check IsRoot first. IsTable/Cell and
// IsHyperText are a similar case.
if (aAcc->IsRoot()) {
MOZ_ASSERT(aAcc->IsLocal());
return new MsaaRootAccessible(aAcc);
}
if (aAcc->IsDoc()) {
return new MsaaDocAccessible(aAcc);
}
if (aAcc->IsTable()) {
return new ia2AccessibleTable(aAcc);
}
if (aAcc->IsTableCell()) {
return new ia2AccessibleTableCell(aAcc);
}
if (aAcc->IsApplication()) {
MOZ_ASSERT(aAcc->IsLocal());
return new ia2AccessibleApplication(aAcc);
}
if (aAcc->IsImage()) {
return new ia2AccessibleImage(aAcc);
}
if (LocalAccessible* localAcc = aAcc->AsLocal()) {
if (localAcc->GetContent() &&
localAcc->GetContent()->IsXULElement(nsGkAtoms::menuitem)) {
return new MsaaXULMenuitemAccessible(aAcc);
}
}
if (aAcc->IsHyperText()) {
return new ia2AccessibleHypertext(aAcc);
}
return new MsaaAccessible(aAcc);
}
MsaaAccessible::MsaaAccessible(Accessible* aAcc) : mAcc(aAcc), mID(kNoID) {}
MsaaAccessible::~MsaaAccessible() {
MOZ_ASSERT(!mAcc, "MsaaShutdown wasn't called!");
if (mID != kNoID) {
sIDGen.ReleaseID(WrapNotNull(this));
}
}
void MsaaAccessible::MsaaShutdown() {
// Accessibles can be shut down twice in some cases. If that happens,
// MsaaShutdown will also be called twice because AccessibleWrap holds
// the reference until its destructor is called; see the comments in
// AccessibleWrap::Shutdown.
if (!mAcc) {
return;
}
if (mID != kNoID) {
auto doc = MsaaDocAccessible::GetFromOwned(mAcc);
MOZ_ASSERT(doc);
doc->RemoveID(mID);
}
mAcc = nullptr;
}
int32_t MsaaAccessible::GetChildIDFor(Accessible* aAccessible) {
// A child ID of the window is required, when we use NotifyWinEvent,
// so that the 3rd party application can call back and get the IAccessible
// the event occurred on.
if (!aAccessible) {
return 0;
}
auto doc = MsaaDocAccessible::GetFromOwned(aAccessible);
if (!doc) {
return 0;
}
uint32_t* id = &MsaaAccessible::GetFrom(aAccessible)->mID;
if (*id != kNoID) return *id;
*id = sIDGen.GetID();
doc->AddID(*id, aAccessible);
return *id;
}
HWND MsaaAccessible::GetHWNDFor(Accessible* aAccessible) {
if (!aAccessible) {
return nullptr;
}
LocalAccessible* localAcc = aAccessible->AsLocal();
if (!localAcc) {
RemoteAccessible* proxy = aAccessible->AsRemote();
if (!proxy) {
return nullptr;
}
// If window emulation is enabled, retrieve the emulated window from the
// containing document document proxy.
if (nsWinUtils::IsWindowEmulationStarted()) {
DocAccessibleParent* doc = proxy->Document();
HWND hWnd = doc->GetEmulatedWindowHandle();
if (hWnd) {
return hWnd;
}
}
// Accessibles in child processes are said to have the HWND of the window
// their tab is within. Popups are always in the parent process, and so
// never proxied, which means this is basically correct.
LocalAccessible* outerDoc = proxy->OuterDocOfRemoteBrowser();
if (!outerDoc) {
// In some cases, the outer document accessible may be unattached from its
// document at this point, if it is scheduled for removal. Do not assert
// in such case. An example: putting aria-hidden="true" on HTML:iframe
// element will destroy iframe's document asynchroniously, but
// the document may be a target of selection events until then, and thus
// it may attempt to deliever these events to MSAA clients.
return nullptr;
}
return GetHWNDFor(outerDoc);
}
DocAccessible* document = localAcc->Document();
if (!document) return nullptr;
// Popup lives in own windows, use its HWND until the popup window is
// hidden to make old JAWS versions work with collapsed comboboxes (see
// discussion in bug 379678).
nsIFrame* frame = localAcc->GetFrame();
if (frame) {
nsIWidget* widget = frame->GetNearestWidget();
if (widget && widget->IsVisible()) {
if (nsViewManager* vm = document->PresShellPtr()->GetViewManager()) {
nsCOMPtr<nsIWidget> rootWidget = vm->GetRootWidget();
// Make sure the accessible belongs to popup. If not then use
// document HWND (which might be different from root widget in the
// case of window emulation).
if (rootWidget != widget)
return static_cast<HWND>(widget->GetNativeData(NS_NATIVE_WINDOW));
}
}
}
return static_cast<HWND>(document->GetNativeWindow());
}
void MsaaAccessible::FireWinEvent(Accessible* aTarget, uint32_t aEventType) {
MOZ_ASSERT(XRE_IsParentProcess());
static_assert(sizeof(gWinEventMap) / sizeof(gWinEventMap[0]) ==
nsIAccessibleEvent::EVENT_LAST_ENTRY,
"MSAA event map skewed");
if (aEventType == 0 || aEventType >= std::size(gWinEventMap)) {
MOZ_ASSERT_UNREACHABLE("invalid event type");
return;
}
uint32_t winEvent = gWinEventMap[aEventType];
if (!winEvent) return;
int32_t childID = MsaaAccessible::GetChildIDFor(aTarget);
if (!childID) return; // Can't fire an event without a child ID
HWND hwnd = GetHWNDFor(aTarget);
if (!hwnd) {
return;
}
// Fire MSAA event for client area window.
::NotifyWinEvent(winEvent, hwnd, OBJID_CLIENT, childID);
}
AccessibleWrap* MsaaAccessible::LocalAcc() {
if (!mAcc || mAcc->IsRemote()) {
return nullptr;
}
auto acc = static_cast<AccessibleWrap*>(mAcc);
MOZ_ASSERT(!acc || !acc->IsDefunct(),
"mAcc defunct but MsaaShutdown wasn't called");
return acc;
}
/**
* This function is a helper for implementing IAccessible methods that accept
* a Child ID as a parameter. If the child ID is CHILDID_SELF, the function
* returns S_OK but a null *aOutInterface. Otherwise, *aOutInterface points
* to the resolved IAccessible.
*
* The CHILDID_SELF case is special because in that case we actually execute
* the implementation of the IAccessible method, whereas in the non-self case,
* we delegate the method call to that object for execution.
*
* A sample invocation of this would look like:
*
* RefPtr<IAccessible> accessible;
* HRESULT hr = ResolveChild(varChild, getter_AddRefs(accessible));
* if (FAILED(hr)) {
* return hr;
* }
*
* if (accessible) {
* return accessible->get_accFoo(kVarChildIdSelf, pszName);
* }
*
* // Implementation for CHILDID_SELF case goes here
*/
HRESULT
MsaaAccessible::ResolveChild(const VARIANT& aVarChild,
IAccessible** aOutInterface) {
MOZ_ASSERT(aOutInterface);
*aOutInterface = nullptr;
if (aVarChild.vt != VT_I4) {
return E_INVALIDARG;
}
if (!mAcc) {
return CO_E_OBJNOTCONNECTED;
}
if (aVarChild.lVal == CHILDID_SELF) {
return S_OK;
}
bool isDefunct = false;
RefPtr<IAccessible> accessible = GetIAccessibleFor(aVarChild, &isDefunct);
if (!accessible) {
return E_INVALIDARG;
}
if (isDefunct) {
return CO_E_OBJNOTCONNECTED;
}
accessible.forget(aOutInterface);
return S_OK;
}
static Accessible* GetAccessibleInSubtree(DocAccessible* aDoc, uint32_t aID) {
Accessible* child = MsaaDocAccessible::GetFrom(aDoc)->GetAccessibleByID(aID);
if (child) return child;
uint32_t childDocCount = aDoc->ChildDocumentCount();
for (uint32_t i = 0; i < childDocCount; i++) {
child = GetAccessibleInSubtree(aDoc->GetChildDocumentAt(i), aID);
if (child) return child;
}
return nullptr;
}
static Accessible* GetAccessibleInSubtree(DocAccessibleParent* aDoc,
uint32_t aID) {
Accessible* child = MsaaDocAccessible::GetFrom(aDoc)->GetAccessibleByID(aID);
if (child) {
return child;
}
size_t childDocCount = aDoc->ChildDocCount();
for (size_t i = 0; i < childDocCount; i++) {
child = GetAccessibleInSubtree(aDoc->ChildDocAt(i), aID);
if (child) {
return child;
}
}
return nullptr;
}
static bool IsInclusiveDescendantOf(DocAccessible* aAncestor,
DocAccessible* aDescendant) {
for (DocAccessible* doc = aDescendant; doc; doc = doc->ParentDocument()) {
if (doc == aAncestor) {
return true;
}
}
return false;
}
already_AddRefed<IAccessible> MsaaAccessible::GetIAccessibleFor(
const VARIANT& aVarChild, bool* aIsDefunct) {
if (aVarChild.vt != VT_I4) return nullptr;
VARIANT varChild = aVarChild;
MOZ_ASSERT(aIsDefunct);
*aIsDefunct = false;
RefPtr<IAccessible> result;
if (!mAcc) {
*aIsDefunct = true;
return nullptr;
}
if (varChild.lVal == CHILDID_SELF) {
result = this;
return result.forget();
}
if (varChild.ulVal != GetExistingID() && nsAccUtils::MustPrune(mAcc)) {
// This accessible should have no subtree in platform, return null for its
// children.
return nullptr;
}
if (varChild.lVal > 0) {
// Gecko child indices are 0-based in contrast to indices used in MSAA.
Accessible* xpAcc = mAcc->ChildAt(varChild.lVal - 1);
if (!xpAcc) {
return nullptr;
}
MOZ_ASSERT(xpAcc->IsRemote() || !xpAcc->AsLocal()->IsDefunct(),
"Shouldn't get a defunct child");
result = MsaaAccessible::GetFrom(xpAcc);
return result.forget();
}
// If lVal negative then it is treated as child ID and we should look for
// accessible through whole accessible subtree including subdocuments.
Accessible* doc = nullptr;
Accessible* child = nullptr;
auto id = static_cast<uint32_t>(varChild.lVal);
if (LocalAccessible* localAcc = mAcc->AsLocal()) {
DocAccessible* localDoc = localAcc->Document();
doc = localDoc;
child = GetAccessibleInSubtree(localDoc, id);
if (!child) {
// Search remote documents which are descendants of this local document.
const auto remoteDocs = DocManager::TopLevelRemoteDocs();
if (!remoteDocs) {
return nullptr;
}
for (DocAccessibleParent* remoteDoc : *remoteDocs) {
LocalAccessible* outerDoc = remoteDoc->OuterDocOfRemoteBrowser();
if (!outerDoc ||
!IsInclusiveDescendantOf(localDoc, outerDoc->Document())) {
continue;
}
child = GetAccessibleInSubtree(remoteDoc, id);
if (child) {
break;
}
}
}
} else {
DocAccessibleParent* remoteDoc = mAcc->AsRemote()->Document();
doc = remoteDoc;
child = GetAccessibleInSubtree(remoteDoc, id);
}
if (!child) {
return nullptr;
}
MOZ_ASSERT(child->IsRemote() || !child->AsLocal()->IsDefunct(),
"Shouldn't get a defunct child");
// If this method is being called on the document we searched, we can just
// return child.
if (mAcc == doc) {
result = MsaaAccessible::GetFrom(child);
return result.forget();
}
// Otherwise, this method was called on a descendant, so we searched an
// ancestor. We must check whether child is really a descendant. This is used
// for ARIA documents and popups.
Accessible* parent = child;
while (parent && parent != doc) {
if (parent == mAcc) {
result = MsaaAccessible::GetFrom(child);
return result.forget();
}
parent = parent->Parent();
}
return nullptr;
}
IDispatch* MsaaAccessible::NativeAccessible(Accessible* aAccessible) {
if (!aAccessible) {
NS_WARNING("Not passing in an aAccessible");
return nullptr;
}
RefPtr<IDispatch> disp;
disp = MsaaAccessible::GetFrom(aAccessible);
IDispatch* rawDisp;
disp.forget(&rawDisp);
return rawDisp;
}
ITypeInfo* MsaaAccessible::GetTI(LCID lcid) {
if (gTypeInfo) return gTypeInfo;
ITypeLib* typeLib = nullptr;
HRESULT hr = LoadRegTypeLib(LIBID_Accessibility, 1, 0, lcid, &typeLib);
if (FAILED(hr)) return nullptr;
hr = typeLib->GetTypeInfoOfGuid(IID_IAccessible, &gTypeInfo);
typeLib->Release();
if (FAILED(hr)) return nullptr;
return gTypeInfo;
}
/* static */
MsaaAccessible* MsaaAccessible::GetFrom(Accessible* aAcc) {
if (!aAcc) {
return nullptr;
}
if (RemoteAccessible* remoteAcc = aAcc->AsRemote()) {
return reinterpret_cast<MsaaAccessible*>(remoteAcc->GetWrapper());
}
return static_cast<AccessibleWrap*>(aAcc)->GetMsaa();
}
/* static */
Accessible* MsaaAccessible::GetAccessibleFrom(IUnknown* aUnknown) {
RefPtr<MsaaAccessible> msaa;
aUnknown->QueryInterface(IID_MsaaAccessible, getter_AddRefs(msaa));
if (!msaa) {
return nullptr;
}
return msaa->Acc();
}
// IUnknown methods
STDMETHODIMP
MsaaAccessible::QueryInterface(REFIID iid, void** ppv) {
if (!ppv) return E_INVALIDARG;
*ppv = nullptr;
if (IID_IClientSecurity == iid) {
// Some code might QI(IID_IClientSecurity) to detect whether or not we are
// a proxy. Right now that can potentially happen off the main thread, so we
// look for this condition immediately so that we don't trigger other code
// that might not be thread-safe.
return E_NOINTERFACE;
}
if (NS_WARN_IF(!NS_IsMainThread())) {
// Bug 1896816: JAWS sometimes traverses into Gecko UI from a file dialog
// thread. It shouldn't do that, but let's fail gracefully instead of
// crashing.
return RPC_E_WRONG_THREAD;
}
// These interfaces are always available. We can support querying to them
// even if the Accessible is dead.
if (IID_IUnknown == iid) {
*ppv = static_cast<IAccessible*>(this);
} else if (IID_MsaaAccessible == iid) {
*ppv = static_cast<MsaaAccessible*>(this);
} else if (IID_IDispatch == iid || IID_IAccessible == iid) {
*ppv = static_cast<IAccessible*>(this);
} else if (IID_IServiceProvider == iid) {
*ppv = new ServiceProvider(this);
} else {
HRESULT hr = ia2Accessible::QueryInterface(iid, ppv);
if (SUCCEEDED(hr)) {
return hr;
}
if (Compatibility::IsUiaEnabled()) {
hr = uiaRawElmProvider::QueryInterface(iid, ppv);
if (SUCCEEDED(hr)) {
return hr;
}
}
}
if (*ppv) {
(reinterpret_cast<IUnknown*>(*ppv))->AddRef();
return S_OK;
}
// For interfaces below this point, we have to query the Accessible to
// determine if they are available.
if (!mAcc) {
// mscom::Interceptor (and maybe other callers) expects either S_OK or
// E_NOINTERFACE, so don't return CO_E_OBJNOTCONNECTED like we normally
// would for a dead object.
return E_NOINTERFACE;
}
AccessibleWrap* localAcc = LocalAcc();
if (IID_IEnumVARIANT == iid) {
// We don't support this interface for leaf elements.
if (!mAcc->HasChildren() || nsAccUtils::MustPrune(mAcc)) {
return E_NOINTERFACE;
}
*ppv = static_cast<IEnumVARIANT*>(new ChildrenEnumVariant(this));
} else if (IID_ISimpleDOMNode == iid) {
if (mAcc->IsDoc() || (localAcc && !localAcc->HasOwnContent())) {
return E_NOINTERFACE;
}
*ppv = static_cast<ISimpleDOMNode*>(new sdnAccessible(WrapNotNull(this)));
}
if (!*ppv && localAcc) {
HRESULT hr = ia2AccessibleComponent::QueryInterface(iid, ppv);
if (SUCCEEDED(hr)) return hr;
}
if (!*ppv) {
HRESULT hr = ia2AccessibleHyperlink::QueryInterface(iid, ppv);
if (SUCCEEDED(hr)) return hr;
}
if (!*ppv) {
HRESULT hr = ia2AccessibleValue::QueryInterface(iid, ppv);
if (SUCCEEDED(hr)) return hr;
}
if (nullptr == *ppv) return E_NOINTERFACE;
(reinterpret_cast<IUnknown*>(*ppv))->AddRef();
return S_OK;
}
// IAccessible methods
STDMETHODIMP
MsaaAccessible::get_accParent(IDispatch __RPC_FAR* __RPC_FAR* ppdispParent) {
if (!ppdispParent) return E_INVALIDARG;
*ppdispParent = nullptr;
if (!mAcc) {
return CO_E_OBJNOTCONNECTED;
}
Accessible* xpParentAcc = mAcc->Parent();
if (!xpParentAcc) return S_FALSE;
*ppdispParent = NativeAccessible(xpParentAcc);
return S_OK;
}
STDMETHODIMP
MsaaAccessible::get_accChildCount(long __RPC_FAR* pcountChildren) {
if (!pcountChildren) return E_INVALIDARG;
*pcountChildren = 0;
if (!mAcc) return CO_E_OBJNOTCONNECTED;
if ((Compatibility::A11ySuppressionReasons() &
SuppressionReasons::Clipboard) &&
mAcc->IsDoc()) {
// Bug 1798098: Windows Suggested Actions (introduced in Windows 11 22H2)
// might walk the entire a11y tree using UIA whenever anything is copied to
// the clipboard. This causes an unacceptable hang. We prevent this tree
// walk by returning a 0 child count for documents, from which Windows might
// walk.
return S_OK;
}
if (nsAccUtils::MustPrune(mAcc)) {
return S_OK;
}
*pcountChildren = mAcc->ChildCount();
return S_OK;
}
STDMETHODIMP
MsaaAccessible::get_accChild(
/* [in] */ VARIANT varChild,
/* [retval][out] */ IDispatch __RPC_FAR* __RPC_FAR* ppdispChild) {
if (!ppdispChild) return E_INVALIDARG;
*ppdispChild = nullptr;
if (!mAcc) return CO_E_OBJNOTCONNECTED;
// IAccessible::accChild is used to return this accessible or child accessible
// at the given index or to get an accessible by child ID in the case of
// document accessible.
// The getting an accessible by child ID is used by
// AccessibleObjectFromEvent() called by AT when AT handles our MSAA event.
bool isDefunct = false;
RefPtr<IAccessible> child = GetIAccessibleFor(varChild, &isDefunct);
if (!child) {
return E_INVALIDARG;
}
if (isDefunct) {
return CO_E_OBJNOTCONNECTED;
}
child.forget(ppdispChild);
return S_OK;
}
STDMETHODIMP
MsaaAccessible::get_accName(
/* [optional][in] */ VARIANT varChild,
/* [retval][out] */ BSTR __RPC_FAR* pszName) {
if (!pszName || varChild.vt != VT_I4) return E_INVALIDARG;
*pszName = nullptr;
RefPtr<IAccessible> accessible;
HRESULT hr = ResolveChild(varChild, getter_AddRefs(accessible));
if (FAILED(hr)) {
return hr;
}
if (accessible) {
return accessible->get_accName(kVarChildIdSelf, pszName);
}
nsAutoString name;
Acc()->Name(name);
if (name.IsVoid()) return S_FALSE;
*pszName = ::SysAllocStringLen(name.get(), name.Length());
if (!*pszName) return E_OUTOFMEMORY;
return S_OK;
}
STDMETHODIMP
MsaaAccessible::get_accValue(
/* [optional][in] */ VARIANT varChild,
/* [retval][out] */ BSTR __RPC_FAR* pszValue) {
if (!pszValue) return E_INVALIDARG;
*pszValue = nullptr;
RefPtr<IAccessible> accessible;
HRESULT hr = ResolveChild(varChild, getter_AddRefs(accessible));
if (FAILED(hr)) {
return hr;
}
if (accessible) {
return accessible->get_accValue(kVarChildIdSelf, pszValue);
}
nsAutoString value;
Acc()->Value(value);
// See bug 438784: need to expose URL on doc's value attribute. For this,
// reverting part of fix for bug 425693 to make this MSAA method behave
// IAccessible2-style.
if (value.IsEmpty()) return S_FALSE;
*pszValue = ::SysAllocStringLen(value.get(), value.Length());
if (!*pszValue) return E_OUTOFMEMORY;
return S_OK;
}
STDMETHODIMP
MsaaAccessible::get_accDescription(VARIANT varChild,
BSTR __RPC_FAR* pszDescription) {
if (!pszDescription) return E_INVALIDARG;
*pszDescription = nullptr;
RefPtr<IAccessible> accessible;
HRESULT hr = ResolveChild(varChild, getter_AddRefs(accessible));
if (FAILED(hr)) {
return hr;
}
if (accessible) {
return accessible->get_accDescription(kVarChildIdSelf, pszDescription);
}
nsAutoString description;
Acc()->Description(description);
*pszDescription =
::SysAllocStringLen(description.get(), description.Length());
return *pszDescription ? S_OK : E_OUTOFMEMORY;
}
STDMETHODIMP
MsaaAccessible::get_accRole(
/* [optional][in] */ VARIANT varChild,
/* [retval][out] */ VARIANT __RPC_FAR* pvarRole) {
if (!pvarRole) return E_INVALIDARG;
VariantInit(pvarRole);
RefPtr<IAccessible> accessible;
HRESULT hr = ResolveChild(varChild, getter_AddRefs(accessible));
if (FAILED(hr)) {
return hr;
}
if (accessible) {
return accessible->get_accRole(kVarChildIdSelf, pvarRole);
}
a11y::role geckoRole;
#ifdef DEBUG
if (mAcc->IsLocal()) {
NS_ASSERTION(nsAccUtils::IsTextInterfaceSupportCorrect(mAcc->AsLocal()),
"Does not support Text when it should");
}
#endif
geckoRole = mAcc->Role();
uint32_t msaaRole = 0;
#define ROLE(_geckoRole, stringRole, ariaRole, atkRole, macRole, macSubrole, \
_msaaRole, ia2Role, androidClass, iosIsElement, uiaControlType, \
nameRule) \
case roles::_geckoRole: \
msaaRole = _msaaRole; \
break;
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 MSAA role a ROLE_OUTLINEITEM for consistency and compatibility. We need
// this because ARIA has a role of "row" for both grid and treegrid
if (geckoRole == roles::ROW) {
Accessible* xpParent = mAcc->Parent();
if (xpParent && xpParent->Role() == roles::TREE_TABLE)
msaaRole = ROLE_SYSTEM_OUTLINEITEM;
}
pvarRole->vt = VT_I4;
pvarRole->lVal = msaaRole;
return S_OK;
}
STDMETHODIMP
MsaaAccessible::get_accState(
/* [optional][in] */ VARIANT varChild,
/* [retval][out] */ VARIANT __RPC_FAR* pvarState) {
if (!pvarState) return E_INVALIDARG;
VariantInit(pvarState);
pvarState->vt = VT_I4;
pvarState->lVal = 0;
RefPtr<IAccessible> accessible;
HRESULT hr = ResolveChild(varChild, getter_AddRefs(accessible));
if (FAILED(hr)) {
return hr;
}
if (accessible) {
return accessible->get_accState(kVarChildIdSelf, pvarState);
}
// MSAA only has 31 states and the lowest 31 bits of our state bit mask
// are the same states as MSAA.
// Note: we map the following Gecko states to different MSAA states:
// REQUIRED -> ALERT_LOW
// ALERT -> ALERT_MEDIUM
// INVALID -> ALERT_HIGH
// CHECKABLE -> MARQUEED
uint64_t state = Acc()->State();
uint32_t msaaState = 0;
nsAccUtils::To32States(state, &msaaState, nullptr);
pvarState->lVal = msaaState;
return S_OK;
}
STDMETHODIMP
MsaaAccessible::get_accHelp(
/* [optional][in] */ VARIANT varChild,
/* [retval][out] */ BSTR __RPC_FAR* pszHelp) {
if (!pszHelp) return E_INVALIDARG;
*pszHelp = nullptr;
return S_FALSE;
}
STDMETHODIMP
MsaaAccessible::get_accHelpTopic(
/* [out] */ BSTR __RPC_FAR* pszHelpFile,
/* [optional][in] */ VARIANT varChild,
/* [retval][out] */ long __RPC_FAR* pidTopic) {
if (!pszHelpFile || !pidTopic) return E_INVALIDARG;
*pszHelpFile = nullptr;
*pidTopic = 0;
return S_FALSE;
}
STDMETHODIMP
MsaaAccessible::get_accKeyboardShortcut(
/* [optional][in] */ VARIANT varChild,
/* [retval][out] */ BSTR __RPC_FAR* pszKeyboardShortcut) {
if (!pszKeyboardShortcut) return E_INVALIDARG;
*pszKeyboardShortcut = nullptr;
RefPtr<IAccessible> accessible;
HRESULT hr = ResolveChild(varChild, getter_AddRefs(accessible));
if (FAILED(hr)) {
return hr;
}
if (accessible) {
return accessible->get_accKeyboardShortcut(kVarChildIdSelf,
pszKeyboardShortcut);
}
nsAutoString shortcut;
if (!mAcc->GetStringARIAAttr(nsGkAtoms::aria_keyshortcuts, shortcut)) {
KeyBinding keyBinding = mAcc->AccessKey();
if (keyBinding.IsEmpty()) {
if (LocalAccessible* localAcc = mAcc->AsLocal()) {
keyBinding = localAcc->KeyboardShortcut();
}
}
keyBinding.ToString(shortcut);
}
*pszKeyboardShortcut = ::SysAllocStringLen(shortcut.get(), shortcut.Length());
return *pszKeyboardShortcut ? S_OK : E_OUTOFMEMORY;
}
STDMETHODIMP
MsaaAccessible::get_accFocus(
/* [retval][out] */ VARIANT __RPC_FAR* pvarChild) {
if (!pvarChild) return E_INVALIDARG;
VariantInit(pvarChild);
// clang-format off
// VT_EMPTY: None. This object does not have the keyboard focus itself
// and does not contain a child that has the keyboard focus.
// VT_I4: lVal is CHILDID_SELF. The object itself has the keyboard focus.
// VT_I4: lVal contains the child ID of the child element with the keyboard focus.
// VT_DISPATCH: pdispVal member is the address of the IDispatch interface
// for the child object with the keyboard focus.
// clang-format on
if (!mAcc) {
return CO_E_OBJNOTCONNECTED;
}
// Return the current IAccessible child that has focus
Accessible* focusedAccessible = mAcc->FocusedChild();
if (focusedAccessible == mAcc) {
pvarChild->vt = VT_I4;
pvarChild->lVal = CHILDID_SELF;
} else if (focusedAccessible) {
pvarChild->vt = VT_DISPATCH;
pvarChild->pdispVal = NativeAccessible(focusedAccessible);
} else {
pvarChild->vt = VT_EMPTY; // No focus or focus is not a child
}
return S_OK;
}
/**
* This helper class implements IEnumVARIANT for a nsTArray containing
* accessible objects.
*/
class AccessibleEnumerator final : public IEnumVARIANT {
public:
explicit AccessibleEnumerator(const nsTArray<Accessible*>& aArray)
: mArray(aArray.Clone()), mCurIndex(0) {}
AccessibleEnumerator(const AccessibleEnumerator& toCopy)
: mArray(toCopy.mArray.Clone()), mCurIndex(toCopy.mCurIndex) {}
~AccessibleEnumerator() {}
// IUnknown
DECL_IUNKNOWN
// IEnumVARIANT
STDMETHODIMP Next(unsigned long celt, VARIANT FAR* rgvar,
unsigned long FAR* pceltFetched);
STDMETHODIMP Skip(unsigned long celt);
STDMETHODIMP Reset() {
mCurIndex = 0;
return S_OK;
}
STDMETHODIMP Clone(IEnumVARIANT FAR* FAR* ppenum);
private:
nsTArray<Accessible*> mArray;
uint32_t mCurIndex;
};
STDMETHODIMP
AccessibleEnumerator::QueryInterface(REFIID iid, void** ppvObject) {
if (iid == IID_IEnumVARIANT) {
*ppvObject = static_cast<IEnumVARIANT*>(this);
AddRef();
return S_OK;
}
if (iid == IID_IUnknown) {
*ppvObject = static_cast<IUnknown*>(this);
AddRef();
return S_OK;
}
*ppvObject = nullptr;
return E_NOINTERFACE;
}
STDMETHODIMP
AccessibleEnumerator::Next(unsigned long celt, VARIANT FAR* rgvar,
unsigned long FAR* pceltFetched) {
uint32_t length = mArray.Length();
HRESULT hr = S_OK;
// Can't get more elements than there are...
if (celt > length - mCurIndex) {
hr = S_FALSE;
celt = length - mCurIndex;
}
// Copy the elements of the array into rgvar.
for (uint32_t i = 0; i < celt; ++i, ++mCurIndex) {
rgvar[i].vt = VT_DISPATCH;
rgvar[i].pdispVal = MsaaAccessible::NativeAccessible(mArray[mCurIndex]);
}
if (pceltFetched) *pceltFetched = celt;
return hr;
}
STDMETHODIMP
AccessibleEnumerator::Clone(IEnumVARIANT FAR* FAR* ppenum) {
*ppenum = new AccessibleEnumerator(*this);
NS_ADDREF(*ppenum);
return S_OK;
}
STDMETHODIMP
AccessibleEnumerator::Skip(unsigned long celt) {
uint32_t length = mArray.Length();
// Check if we can skip the requested number of elements
if (celt > length - mCurIndex) {
mCurIndex = length;
return S_FALSE;
}
mCurIndex += celt;
return S_OK;
}
/**
* This method is called when a client wants to know which children of a node
* are selected. Note that this method can only find selected children for
* accessible object which implement SelectAccessible.
*
* The VARIANT return value arguement is expected to either contain a single
* IAccessible or an IEnumVARIANT of IAccessibles. We return the IEnumVARIANT
* regardless of the number of children selected, unless there are none selected
* in which case we return an empty VARIANT.
*
* We get the selected options from the select's accessible object and wrap
* those in an AccessibleEnumerator which we then put in the return VARIANT.
*
* returns a VT_EMPTY VARIANT if:
* - there are no selected children for this object
* - the object is not the type that can have children selected
*/
STDMETHODIMP
MsaaAccessible::get_accSelection(VARIANT __RPC_FAR* pvarChildren) {
if (!pvarChildren) return E_INVALIDARG;
VariantInit(pvarChildren);
pvarChildren->vt = VT_EMPTY;
if (!mAcc) {
return CO_E_OBJNOTCONNECTED;
}
Accessible* acc = Acc();
if (!acc->IsSelect()) {
return S_OK;
}
AutoTArray<Accessible*, 10> selectedItems;
acc->SelectedItems(&selectedItems);
uint32_t count = selectedItems.Length();
if (count == 1) {
pvarChildren->vt = VT_DISPATCH;
pvarChildren->pdispVal = NativeAccessible(selectedItems[0]);
} else if (count > 1) {
RefPtr<AccessibleEnumerator> pEnum =
new AccessibleEnumerator(selectedItems);
pvarChildren->vt =
VT_UNKNOWN; // this must be VT_UNKNOWN for an IEnumVARIANT
NS_ADDREF(pvarChildren->punkVal = pEnum);
}
// If count == 0, vt is already VT_EMPTY, so there's nothing else to do.
return S_OK;
}
STDMETHODIMP
MsaaAccessible::get_accDefaultAction(
/* [optional][in] */ VARIANT varChild,
/* [retval][out] */ BSTR __RPC_FAR* pszDefaultAction) {
if (!pszDefaultAction) return E_INVALIDARG;
*pszDefaultAction = nullptr;
RefPtr<IAccessible> accessible;
HRESULT hr = ResolveChild(varChild, getter_AddRefs(accessible));
if (FAILED(hr)) {
return hr;
}
if (accessible) {
return accessible->get_accDefaultAction(kVarChildIdSelf, pszDefaultAction);
}
nsAutoString defaultAction;
mAcc->ActionNameAt(0, defaultAction);
*pszDefaultAction =
::SysAllocStringLen(defaultAction.get(), defaultAction.Length());
return *pszDefaultAction ? S_OK : E_OUTOFMEMORY;
}
STDMETHODIMP
MsaaAccessible::accSelect(
/* [in] */ long flagsSelect,
/* [optional][in] */ VARIANT varChild) {
RefPtr<IAccessible> accessible;
HRESULT hr = ResolveChild(varChild, getter_AddRefs(accessible));
if (FAILED(hr)) {
return hr;
}
if (accessible) {
return accessible->accSelect(flagsSelect, kVarChildIdSelf);
}
if (flagsSelect & SELFLAG_TAKEFOCUS) {
mAcc->TakeFocus();
return S_OK;
}
if (flagsSelect & SELFLAG_TAKESELECTION) {
mAcc->TakeSelection();
return S_OK;
}
if (flagsSelect & SELFLAG_ADDSELECTION) {
mAcc->SetSelected(true);
return S_OK;
}
if (flagsSelect & SELFLAG_REMOVESELECTION) {
mAcc->SetSelected(false);
return S_OK;
}
return E_FAIL;
}
STDMETHODIMP
MsaaAccessible::accLocation(
/* [out] */ long __RPC_FAR* pxLeft,
/* [out] */ long __RPC_FAR* pyTop,
/* [out] */ long __RPC_FAR* pcxWidth,
/* [out] */ long __RPC_FAR* pcyHeight,
/* [optional][in] */ VARIANT varChild) {
if (!pxLeft || !pyTop || !pcxWidth || !pcyHeight) return E_INVALIDARG;
*pxLeft = 0;
*pyTop = 0;
*pcxWidth = 0;
*pcyHeight = 0;
RefPtr<IAccessible> accessible;
HRESULT hr = ResolveChild(varChild, getter_AddRefs(accessible));
if (FAILED(hr)) {
return hr;
}
if (accessible) {
return accessible->accLocation(pxLeft, pyTop, pcxWidth, pcyHeight,
kVarChildIdSelf);
}
LayoutDeviceIntRect rect = Acc()->Bounds();
*pxLeft = rect.X();
*pyTop = rect.Y();
*pcxWidth = rect.Width();
*pcyHeight = rect.Height();
return S_OK;
}
STDMETHODIMP
MsaaAccessible::accNavigate(
/* [in] */ long navDir,
/* [optional][in] */ VARIANT varStart,
/* [retval][out] */ VARIANT __RPC_FAR* pvarEndUpAt) {
if (!pvarEndUpAt) return E_INVALIDARG;
VariantInit(pvarEndUpAt);
RefPtr<IAccessible> accessible;
HRESULT hr = ResolveChild(varStart, getter_AddRefs(accessible));
if (FAILED(hr)) {
return hr;
}
if (accessible) {
return accessible->accNavigate(navDir, kVarChildIdSelf, pvarEndUpAt);
}
Accessible* navAccessible = nullptr;
Maybe<RelationType> xpRelation;
#define RELATIONTYPE(geckoType, stringType, atkType, msaaType, ia2Type) \
case msaaType: \
xpRelation.emplace(RelationType::geckoType); \
break;
switch (navDir) {
case NAVDIR_FIRSTCHILD:
if (!nsAccUtils::MustPrune(mAcc)) {
navAccessible = mAcc->FirstChild();
}
break;
case NAVDIR_LASTCHILD:
if (!nsAccUtils::MustPrune(mAcc)) {
navAccessible = mAcc->LastChild();
}
break;
case NAVDIR_NEXT:
navAccessible = mAcc->NextSibling();
break;
case NAVDIR_PREVIOUS:
navAccessible = mAcc->PrevSibling();
break;
case NAVDIR_DOWN:
case NAVDIR_LEFT:
case NAVDIR_RIGHT:
case NAVDIR_UP:
return E_NOTIMPL;
// MSAA relationship extensions to accNavigate
#include "RelationTypeMap.h"
default:
return E_INVALIDARG;
}
#undef RELATIONTYPE
pvarEndUpAt->vt = VT_EMPTY;
if (xpRelation) {
Relation rel = mAcc->RelationByType(*xpRelation);
navAccessible = rel.Next();
}
if (!navAccessible) return E_FAIL;
pvarEndUpAt->pdispVal = NativeAccessible(navAccessible);
pvarEndUpAt->vt = VT_DISPATCH;
return S_OK;
}
STDMETHODIMP
MsaaAccessible::accHitTest(
/* [in] */ long xLeft,
/* [in] */ long yTop,
/* [retval][out] */ VARIANT __RPC_FAR* pvarChild) {
if (!pvarChild) return E_INVALIDARG;
VariantInit(pvarChild);
if (!mAcc) {
return CO_E_OBJNOTCONNECTED;
}
// The MSAA documentation says accHitTest should return a child. However,
// clients call AccessibleObjectFromPoint, which ends up walking the
// descendants calling accHitTest on each one. Since clients want the
// deepest descendant anyway, it's faster and probably more accurate to
// just do this ourselves.
Accessible* accessible = mAcc->ChildAtPoint(
xLeft, yTop, Accessible::EWhichChildAtPoint::DeepestChild);
// if we got a child
if (accessible) {
if (accessible != mAcc && accessible->IsTextLeaf()) {
Accessible* parent = accessible->Parent();
if (parent != mAcc && parent->Role() == roles::LINK) {
// Bug 1843832: The UI Automation -> IAccessible2 proxy barfs if we
// return the text leaf child of a link when hit testing an ancestor of
// the link. Therefore, we return the link instead. MSAA clients which
// call AccessibleObjectFromPoint will still get to the text leaf, since
// AccessibleObjectFromPoint keeps calling accHitTest until it can't
// descend any further. We should remove this tragic hack once we have
// a native UIA implementation.
accessible = parent;
}
}
if (accessible == mAcc) {
pvarChild->vt = VT_I4;
pvarChild->lVal = CHILDID_SELF;
} else {
pvarChild->vt = VT_DISPATCH;
pvarChild->pdispVal = NativeAccessible(accessible);
}
} else {
// no child at that point
pvarChild->vt = VT_EMPTY;
return S_FALSE;
}
return S_OK;
}
STDMETHODIMP
MsaaAccessible::accDoDefaultAction(
/* [optional][in] */ VARIANT varChild) {
RefPtr<IAccessible> accessible;
HRESULT hr = ResolveChild(varChild, getter_AddRefs(accessible));
if (FAILED(hr)) {
return hr;
}
if (accessible) {
return accessible->accDoDefaultAction(kVarChildIdSelf);
}
return mAcc->DoAction(0) ? S_OK : E_INVALIDARG;
}
STDMETHODIMP
MsaaAccessible::put_accName(
/* [optional][in] */ VARIANT varChild,
/* [in] */ BSTR szName) {
return E_NOTIMPL;
}
STDMETHODIMP
MsaaAccessible::put_accValue(
/* [optional][in] */ VARIANT varChild,
/* [in] */ BSTR szValue) {
RefPtr<IAccessible> accessible;
HRESULT hr = ResolveChild(varChild, getter_AddRefs(accessible));
if (FAILED(hr)) {
return hr;
}
if (accessible) {
return accessible->put_accValue(kVarChildIdSelf, szValue);
}
HyperTextAccessibleBase* ht = mAcc->AsHyperTextBase();
if (!ht) {
return E_NOTIMPL;
}
uint32_t length = ::SysStringLen(szValue);
nsAutoString text(szValue, length);
ht->ReplaceText(text);
return S_OK;
}
// IDispatch methods
STDMETHODIMP
MsaaAccessible::GetTypeInfoCount(UINT* pctinfo) {
if (!pctinfo) return E_INVALIDARG;
*pctinfo = 1;
return S_OK;
}
STDMETHODIMP
MsaaAccessible::GetTypeInfo(UINT iTInfo, LCID lcid, ITypeInfo** ppTInfo) {
if (!ppTInfo) return E_INVALIDARG;
*ppTInfo = nullptr;
if (iTInfo != 0) return DISP_E_BADINDEX;
ITypeInfo* typeInfo = GetTI(lcid);
if (!typeInfo) return E_FAIL;
typeInfo->AddRef();
*ppTInfo = typeInfo;
return S_OK;
}
STDMETHODIMP
MsaaAccessible::GetIDsOfNames(REFIID riid, LPOLESTR* rgszNames, UINT cNames,
LCID lcid, DISPID* rgDispId) {
ITypeInfo* typeInfo = GetTI(lcid);
if (!typeInfo) return E_FAIL;
HRESULT hr = DispGetIDsOfNames(typeInfo, rgszNames, cNames, rgDispId);
return hr;
}
STDMETHODIMP
MsaaAccessible::Invoke(DISPID dispIdMember, REFIID riid, LCID lcid, WORD wFlags,
DISPPARAMS* pDispParams, VARIANT* pVarResult,
EXCEPINFO* pExcepInfo, UINT* puArgErr) {
ITypeInfo* typeInfo = GetTI(lcid);
if (!typeInfo) return E_FAIL;
return typeInfo->Invoke(static_cast<IAccessible*>(this), dispIdMember, wFlags,
pDispParams, pVarResult, pExcepInfo, puArgErr);
}
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