зеркало из https://github.com/mozilla/gecko-dev.git
345 строки
11 KiB
C++
345 строки
11 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef mozilla_a11y_DocAccessibleParent_h
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#define mozilla_a11y_DocAccessibleParent_h
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#include "nsAccessibilityService.h"
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#include "mozilla/a11y/PDocAccessibleParent.h"
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#include "mozilla/a11y/ProxyAccessible.h"
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#include "mozilla/Tuple.h"
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#include "nsClassHashtable.h"
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#include "nsHashKeys.h"
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#include "nsISupportsImpl.h"
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namespace mozilla {
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namespace a11y {
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class xpcAccessibleGeneric;
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#if !defined(XP_WIN)
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class DocAccessiblePlatformExtParent;
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#endif
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/*
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* These objects live in the main process and comunicate with and represent
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* an accessible document in a content process.
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*/
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class DocAccessibleParent : public ProxyAccessible,
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public PDocAccessibleParent {
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public:
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NS_INLINE_DECL_REFCOUNTING(DocAccessibleParent);
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DocAccessibleParent()
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: ProxyAccessible(this),
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mParentDoc(kNoParentDoc),
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#if defined(XP_WIN)
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mEmulatedWindowHandle(nullptr),
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#endif // defined(XP_WIN)
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mTopLevel(false),
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mTopLevelInContentProcess(false),
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mShutdown(false) {
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sMaxDocID++;
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mActorID = sMaxDocID;
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MOZ_ASSERT(!LiveDocs().Get(mActorID));
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LiveDocs().Put(mActorID, this);
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}
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/**
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* Set this as a top level document; i.e. it is not embedded by another remote
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* document. This also means it is a top level document in its content
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* process.
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* Tab documents are top level documents.
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*/
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void SetTopLevel() {
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mTopLevel = true;
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mTopLevelInContentProcess = true;
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}
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bool IsTopLevel() const { return mTopLevel; }
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/**
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* Set this as a top level document in its content process.
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* Note that this could be an out-of-process iframe embedded by a remote
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* embedder document. In that case, IsToplevel() will return false, but
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* IsTopLevelInContentProcess() will return true.
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*/
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void SetTopLevelInContentProcess() { mTopLevelInContentProcess = true; }
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bool IsTopLevelInContentProcess() const { return mTopLevelInContentProcess; }
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bool IsShutdown() const { return mShutdown; }
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/**
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* Mark this actor as shutdown without doing any cleanup. This should only
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* be called on actors that have just been initialized, so probably only from
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* RecvPDocAccessibleConstructor.
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*/
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void MarkAsShutdown() {
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MOZ_ASSERT(mChildDocs.IsEmpty());
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MOZ_ASSERT(mAccessibles.Count() == 0);
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mShutdown = true;
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}
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/*
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* Called when a message from a document in a child process notifies the main
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* process it is firing an event.
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*/
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virtual mozilla::ipc::IPCResult RecvEvent(const uint64_t& aID,
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const uint32_t& aType) override;
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virtual mozilla::ipc::IPCResult RecvShowEvent(const ShowEventData& aData,
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const bool& aFromUser) override;
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virtual mozilla::ipc::IPCResult RecvHideEvent(const uint64_t& aRootID,
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const bool& aFromUser) override;
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mozilla::ipc::IPCResult RecvStateChangeEvent(const uint64_t& aID,
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const uint64_t& aState,
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const bool& aEnabled) final;
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mozilla::ipc::IPCResult RecvCaretMoveEvent(
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const uint64_t& aID,
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#if defined(XP_WIN)
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const LayoutDeviceIntRect& aCaretRect,
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#endif
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const int32_t& aOffset) final;
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virtual mozilla::ipc::IPCResult RecvTextChangeEvent(
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const uint64_t& aID, const nsString& aStr, const int32_t& aStart,
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const uint32_t& aLen, const bool& aIsInsert,
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const bool& aFromUser) override;
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#if defined(XP_WIN)
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virtual mozilla::ipc::IPCResult RecvSyncTextChangeEvent(
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const uint64_t& aID, const nsString& aStr, const int32_t& aStart,
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const uint32_t& aLen, const bool& aIsInsert,
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const bool& aFromUser) override;
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virtual mozilla::ipc::IPCResult RecvFocusEvent(
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const uint64_t& aID, const LayoutDeviceIntRect& aCaretRect) override;
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#endif // defined(XP_WIN)
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virtual mozilla::ipc::IPCResult RecvSelectionEvent(
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const uint64_t& aID, const uint64_t& aWidgetID,
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const uint32_t& aType) override;
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MOZ_CAN_RUN_SCRIPT_BOUNDARY
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virtual mozilla::ipc::IPCResult RecvVirtualCursorChangeEvent(
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const uint64_t& aID, const uint64_t& aOldPositionID,
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const int32_t& aOldStartOffset, const int32_t& aOldEndOffset,
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const uint64_t& aNewPositionID, const int32_t& aNewStartOffset,
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const int32_t& aNewEndOffset, const int16_t& aReason,
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const int16_t& aBoundaryType, const bool& aFromUser) override;
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virtual mozilla::ipc::IPCResult RecvScrollingEvent(
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const uint64_t& aID, const uint64_t& aType, const uint32_t& aScrollX,
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const uint32_t& aScrollY, const uint32_t& aMaxScrollX,
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const uint32_t& aMaxScrollY) override;
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#if !defined(XP_WIN)
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virtual mozilla::ipc::IPCResult RecvAnnouncementEvent(
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const uint64_t& aID, const nsString& aAnnouncement,
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const uint16_t& aPriority) override;
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#endif
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mozilla::ipc::IPCResult RecvRoleChangedEvent(const a11y::role& aRole) final;
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virtual mozilla::ipc::IPCResult RecvBindChildDoc(
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PDocAccessibleParent* aChildDoc, const uint64_t& aID) override;
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void Unbind() {
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if (DocAccessibleParent* parent = ParentDoc()) {
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parent->RemoveChildDoc(this);
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}
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SetParent(nullptr);
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}
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virtual mozilla::ipc::IPCResult RecvShutdown() override;
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void Destroy();
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virtual void ActorDestroy(ActorDestroyReason aWhy) override {
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MOZ_ASSERT(CheckDocTree());
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if (!mShutdown) Destroy();
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}
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/*
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* Return the main processes representation of the parent document (if any)
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* of the document this object represents.
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*/
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DocAccessibleParent* ParentDoc() const;
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static const uint64_t kNoParentDoc = UINT64_MAX;
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/*
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* Called when a document in a content process notifies the main process of a
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* new child document.
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*/
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ipc::IPCResult AddChildDoc(DocAccessibleParent* aChildDoc, uint64_t aParentID,
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bool aCreating = true);
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/*
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* Called when the document in the content process this object represents
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* notifies the main process a child document has been removed.
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*/
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void RemoveChildDoc(DocAccessibleParent* aChildDoc) {
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ProxyAccessible* parent = aChildDoc->Parent();
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MOZ_ASSERT(parent);
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if (parent) {
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aChildDoc->Parent()->ClearChildDoc(aChildDoc);
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}
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DebugOnly<bool> result = mChildDocs.RemoveElement(aChildDoc->mActorID);
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aChildDoc->mParentDoc = kNoParentDoc;
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MOZ_ASSERT(result);
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}
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void RemoveAccessible(ProxyAccessible* aAccessible) {
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MOZ_DIAGNOSTIC_ASSERT(mAccessibles.GetEntry(aAccessible->ID()));
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mAccessibles.RemoveEntry(aAccessible->ID());
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}
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/**
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* Return the accessible for given id.
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*/
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ProxyAccessible* GetAccessible(uintptr_t aID) {
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if (!aID) return this;
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ProxyEntry* e = mAccessibles.GetEntry(aID);
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return e ? e->mProxy : nullptr;
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}
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const ProxyAccessible* GetAccessible(uintptr_t aID) const {
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return const_cast<DocAccessibleParent*>(this)->GetAccessible(aID);
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}
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size_t ChildDocCount() const { return mChildDocs.Length(); }
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const DocAccessibleParent* ChildDocAt(size_t aIdx) const {
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return const_cast<DocAccessibleParent*>(this)->ChildDocAt(aIdx);
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}
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DocAccessibleParent* ChildDocAt(size_t aIdx) {
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return LiveDocs().Get(mChildDocs[aIdx]);
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}
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#if defined(XP_WIN)
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void MaybeInitWindowEmulation();
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/**
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* Note that an OuterDocAccessible can be created before the
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* DocAccessibleParent or vice versa. Therefore, this must be conditionally
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* called when either of these is created.
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* @param aOuterDoc The OuterDocAccessible to be returned as the parent of
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* this document. Only GetNativeInterface() is called on this, so it
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* may be a ProxyAccessibleWrap or similar.
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*/
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void SendParentCOMProxy(Accessible* aOuterDoc);
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virtual mozilla::ipc::IPCResult RecvGetWindowedPluginIAccessible(
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const WindowsHandle& aHwnd, IAccessibleHolder* aPluginCOMProxy) override;
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/**
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* Set emulated native window handle for a document.
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* @param aWindowHandle emulated native window handle
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*/
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void SetEmulatedWindowHandle(HWND aWindowHandle);
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HWND GetEmulatedWindowHandle() const { return mEmulatedWindowHandle; }
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#endif
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#if !defined(XP_WIN)
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virtual mozilla::ipc::IPCResult RecvBatch(
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const uint64_t& aBatchType, nsTArray<BatchData>&& aData) override;
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virtual bool DeallocPDocAccessiblePlatformExtParent(
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PDocAccessiblePlatformExtParent* aActor) override;
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virtual PDocAccessiblePlatformExtParent*
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AllocPDocAccessiblePlatformExtParent() override;
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DocAccessiblePlatformExtParent* GetPlatformExtension();
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#endif
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/**
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* If this is an iframe document rendered in a different process to its
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* embedder, return the DocAccessibleParent and id for the embedder
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* accessible. Otherwise, return null and 0.
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*/
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Tuple<DocAccessibleParent*, uint64_t> GetRemoteEmbedder();
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private:
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~DocAccessibleParent() {
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LiveDocs().Remove(mActorID);
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MOZ_ASSERT(mChildDocs.Length() == 0);
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MOZ_ASSERT(!ParentDoc());
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}
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class ProxyEntry : public PLDHashEntryHdr {
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public:
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explicit ProxyEntry(const void*) : mProxy(nullptr) {}
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ProxyEntry(ProxyEntry&& aOther) : mProxy(aOther.mProxy) {
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aOther.mProxy = nullptr;
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}
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~ProxyEntry() { delete mProxy; }
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typedef uint64_t KeyType;
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typedef const void* KeyTypePointer;
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bool KeyEquals(const void* aKey) const {
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return mProxy->ID() == (uint64_t)aKey;
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}
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static const void* KeyToPointer(uint64_t aKey) { return (void*)aKey; }
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static PLDHashNumber HashKey(const void* aKey) { return (uint64_t)aKey; }
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enum { ALLOW_MEMMOVE = true };
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ProxyAccessible* mProxy;
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};
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uint32_t AddSubtree(ProxyAccessible* aParent,
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const nsTArray<AccessibleData>& aNewTree, uint32_t aIdx,
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uint32_t aIdxInParent);
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MOZ_MUST_USE bool CheckDocTree() const;
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xpcAccessibleGeneric* GetXPCAccessible(ProxyAccessible* aProxy);
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nsTArray<uint64_t> mChildDocs;
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uint64_t mParentDoc;
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#if defined(XP_WIN)
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// The handle associated with the emulated window that contains this document
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HWND mEmulatedWindowHandle;
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# if defined(MOZ_SANDBOX)
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mscom::PreservedStreamPtr mParentProxyStream;
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mscom::PreservedStreamPtr mDocProxyStream;
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# endif // defined(MOZ_SANDBOX)
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#endif // defined(XP_WIN)
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/*
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* Conceptually this is a map from IDs to proxies, but we store the ID in the
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* proxy object so we can't use a real map.
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*/
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nsTHashtable<ProxyEntry> mAccessibles;
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uint64_t mActorID;
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bool mTopLevel;
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bool mTopLevelInContentProcess;
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bool mShutdown;
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struct PendingChildDoc {
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PendingChildDoc(DocAccessibleParent* aChildDoc, uint64_t aParentID)
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: mChildDoc(aChildDoc), mParentID(aParentID) {}
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RefPtr<DocAccessibleParent> mChildDoc;
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uint64_t mParentID;
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};
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// We use nsTArray because there will be very few entries.
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nsTArray<PendingChildDoc> mPendingChildDocs;
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static uint64_t sMaxDocID;
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static nsDataHashtable<nsUint64HashKey, DocAccessibleParent*>& LiveDocs() {
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static nsDataHashtable<nsUint64HashKey, DocAccessibleParent*> sLiveDocs;
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return sLiveDocs;
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}
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};
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} // namespace a11y
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} // namespace mozilla
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#endif
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