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Diffstat (limited to 'accessible/windows/msaa/DocAccessibleWrap.cpp')
| -rw-r--r-- | accessible/windows/msaa/DocAccessibleWrap.cpp | 210 |
1 files changed, 210 insertions, 0 deletions
diff --git a/accessible/windows/msaa/DocAccessibleWrap.cpp b/accessible/windows/msaa/DocAccessibleWrap.cpp new file mode 100644 index 0000000000..c4d696ae3c --- /dev/null +++ b/accessible/windows/msaa/DocAccessibleWrap.cpp @@ -0,0 +1,210 @@ +/* -*- 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 "DocAccessibleWrap.h" + +#include "Compatibility.h" +#include "mozilla/PresShell.h" +#include "mozilla/dom/BrowserChild.h" +#include "DocAccessibleChild.h" +#include "nsWinUtils.h" +#include "Role.h" +#include "RootAccessible.h" +#include "sdnDocAccessible.h" +#include "Statistics.h" + +#include "nsIDocShell.h" +#include "nsIInterfaceRequestorUtils.h" + +using namespace mozilla; +using namespace mozilla::a11y; + +//////////////////////////////////////////////////////////////////////////////// +// DocAccessibleWrap +//////////////////////////////////////////////////////////////////////////////// + +DocAccessibleWrap::DocAccessibleWrap(dom::Document* aDocument, + PresShell* aPresShell) + : DocAccessible(aDocument, aPresShell), mHWND(nullptr) {} + +DocAccessibleWrap::~DocAccessibleWrap() {} + +IMPL_IUNKNOWN_QUERY_HEAD(DocAccessibleWrap) +if (aIID == IID_ISimpleDOMDocument) { + statistics::ISimpleDOMUsed(); + *aInstancePtr = static_cast<ISimpleDOMDocument*>(new sdnDocAccessible(this)); + static_cast<IUnknown*>(*aInstancePtr)->AddRef(); + return S_OK; +} +IMPL_IUNKNOWN_QUERY_TAIL_INHERITED(HyperTextAccessibleWrap) + +STDMETHODIMP +DocAccessibleWrap::get_accParent( + /* [retval][out] */ IDispatch __RPC_FAR* __RPC_FAR* ppdispParent) { + if (IsDefunct()) { + return CO_E_OBJNOTCONNECTED; + } + + // We might be a top-level document in a content process. + DocAccessibleChild* ipcDoc = IPCDoc(); + if (ipcDoc && static_cast<dom::BrowserChild*>(ipcDoc->Manager()) + ->GetTopLevelDocAccessibleChild() == ipcDoc) { + // Emulated window proxy is only set for the top level content document when + // emulation is enabled. + RefPtr<IDispatch> dispParent = ipcDoc->GetEmulatedWindowIAccessible(); + if (!dispParent) { + dispParent = ipcDoc->GetParentIAccessible(); + } + + if (!dispParent) { + return S_FALSE; + } + + dispParent.forget(ppdispParent); + return S_OK; + } + + // In the parent process, return window system accessible object for root + // document accessibles, as well as tab document accessibles if window + // emulation is enabled. + if (XRE_IsParentProcess() && + (!ParentDocument() || + (nsWinUtils::IsWindowEmulationStarted() && + nsCoreUtils::IsTopLevelContentDocInProcess(DocumentNode())))) { + HWND hwnd = static_cast<HWND>(GetNativeWindow()); + if (hwnd && !ParentDocument()) { + nsIFrame* frame = GetFrame(); + if (frame) { + nsIWidget* widget = frame->GetNearestWidget(); + if (widget->WindowType() == eWindowType_child && !widget->GetParent()) { + // Bug 1427304: Windows opened with popup=yes (such as the WebRTC + // sharing indicator) get two HWNDs. The root widget is associated + // with the inner HWND, but the outer HWND still answers to + // WM_GETOBJECT queries. This means that getting the parent of the + // oleacc window accessible for the inner HWND returns this + // root accessible. Thus, to avoid a loop, we must never return the + // oleacc window accessible for the inner HWND. Instead, we use the + // outer HWND here. + HWND parentHwnd = ::GetParent(hwnd); + if (parentHwnd) { + MOZ_ASSERT(::GetWindowLongW(parentHwnd, GWL_STYLE) & WS_POPUP, + "Parent HWND should be a popup!"); + hwnd = parentHwnd; + } + } + } + } + if (hwnd && + SUCCEEDED(::AccessibleObjectFromWindow( + hwnd, OBJID_WINDOW, IID_IAccessible, (void**)ppdispParent))) { + return S_OK; + } + } + + return DocAccessible::get_accParent(ppdispParent); +} + +STDMETHODIMP +DocAccessibleWrap::get_accValue(VARIANT aVarChild, BSTR __RPC_FAR* aValue) { + if (!aValue) return E_INVALIDARG; + *aValue = nullptr; + + // For backwards-compat, we still support old MSAA hack to provide URL in + // accValue Check for real value first + HRESULT hr = AccessibleWrap::get_accValue(aVarChild, aValue); + if (FAILED(hr) || *aValue || aVarChild.lVal != CHILDID_SELF) return hr; + + // If document is being used to create a widget, don't use the URL hack + roles::Role role = Role(); + if (role != roles::DOCUMENT && role != roles::APPLICATION && + role != roles::DIALOG && role != roles::ALERT && + role != roles::NON_NATIVE_DOCUMENT) + return hr; + + nsAutoString url; + URL(url); + if (url.IsEmpty()) return S_FALSE; + + *aValue = ::SysAllocStringLen(url.get(), url.Length()); + return *aValue ? S_OK : E_OUTOFMEMORY; +} + +//////////////////////////////////////////////////////////////////////////////// +// Accessible + +void DocAccessibleWrap::Shutdown() { + // Do window emulation specific shutdown if emulation was started. + if (nsWinUtils::IsWindowEmulationStarted()) { + // Destroy window created for root document. + if (mDocFlags & eTopLevelContentDocInProcess) { + MOZ_ASSERT(XRE_IsParentProcess()); + HWND hWnd = static_cast<HWND>(mHWND); + ::RemovePropW(hWnd, kPropNameDocAcc); + ::DestroyWindow(hWnd); + } + + mHWND = nullptr; + } + + DocAccessible::Shutdown(); +} + +//////////////////////////////////////////////////////////////////////////////// +// DocAccessible public + +void* DocAccessibleWrap::GetNativeWindow() const { + if (XRE_IsContentProcess()) { + DocAccessibleChild* ipcDoc = IPCDoc(); + if (!ipcDoc) { + return nullptr; + } + + return ipcDoc->GetNativeWindowHandle(); + } else if (mHWND) { + return mHWND; + } + return DocAccessible::GetNativeWindow(); +} + +//////////////////////////////////////////////////////////////////////////////// +// DocAccessible protected + +void DocAccessibleWrap::DoInitialUpdate() { + DocAccessible::DoInitialUpdate(); + + if (nsWinUtils::IsWindowEmulationStarted()) { + // Create window for tab document. + if (mDocFlags & eTopLevelContentDocInProcess) { + MOZ_ASSERT(XRE_IsParentProcess()); + a11y::RootAccessible* rootDocument = RootAccessible(); + bool isActive = true; + nsIntRect rect(CW_USEDEFAULT, CW_USEDEFAULT, 0, 0); + if (Compatibility::IsDolphin()) { + rect = Bounds(); + nsIntRect rootRect = rootDocument->Bounds(); + rect.MoveToX(rootRect.X() - rect.X()); + rect.MoveByY(-rootRect.Y()); + + auto* bc = mDocumentNode->GetBrowsingContext(); + isActive = bc && bc->IsActive(); + } + + RefPtr<DocAccessibleWrap> self(this); + nsWinUtils::NativeWindowCreateProc onCreate([self](HWND aHwnd) -> void { + ::SetPropW(aHwnd, kPropNameDocAcc, + reinterpret_cast<HANDLE>(self.get())); + }); + + HWND parentWnd = reinterpret_cast<HWND>(rootDocument->GetNativeWindow()); + mHWND = nsWinUtils::CreateNativeWindow( + kClassNameTabContent, parentWnd, rect.X(), rect.Y(), rect.Width(), + rect.Height(), isActive, &onCreate); + } else { + DocAccessible* parentDocument = ParentDocument(); + if (parentDocument) mHWND = parentDocument->GetNativeWindow(); + } + } +} |