зеркало из https://github.com/mozilla/gecko-dev.git
291 строка
10 KiB
C++
291 строка
10 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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#include "Accessible-inl.h"
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#include "DocAccessibleChild.h"
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#include "DocAccessibleWrap.h"
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#include "nsIDocShell.h"
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#include "nsLayoutUtils.h"
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#include "nsAccessibilityService.h"
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#include "nsAccUtils.h"
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#include "nsIPersistentProperties2.h"
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#include "Pivot.h"
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#include "SessionAccessibility.h"
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#include "TraversalRule.h"
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#include "mozilla/PresShell.h"
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#include "mozilla/a11y/DocAccessiblePlatformExtChild.h"
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using namespace mozilla;
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using namespace mozilla::a11y;
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const uint32_t kCacheRefreshInterval = 500;
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#define UNIQUE_ID(acc) \
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!acc || (acc->IsDoc() && acc->AsDoc()->IPCDoc()) \
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? 0 \
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: reinterpret_cast<uint64_t>(acc->UniqueID())
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////////////////////////////////////////////////////////////////////////////////
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// DocAccessibleWrap
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////////////////////////////////////////////////////////////////////////////////
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DocAccessibleWrap::DocAccessibleWrap(Document* aDocument, PresShell* aPresShell)
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: DocAccessible(aDocument, aPresShell) {
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if (aDocument->GetBrowsingContext()->IsTopContent()) {
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// The top-level content document gets this special ID.
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mID = kNoID;
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} else {
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mID = AcquireID();
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}
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}
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DocAccessibleWrap::~DocAccessibleWrap() {}
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AccessibleWrap* DocAccessibleWrap::GetAccessibleByID(int32_t aID) const {
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if (AccessibleWrap* acc = mIDToAccessibleMap.Get(aID)) {
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return acc;
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}
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// If the ID is not in the hash table, check the IDs of the child docs.
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for (uint32_t i = 0; i < ChildDocumentCount(); i++) {
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auto childDoc = reinterpret_cast<AccessibleWrap*>(GetChildDocumentAt(i));
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if (childDoc->VirtualViewID() == aID) {
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return childDoc;
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}
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}
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return nullptr;
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}
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void DocAccessibleWrap::DoInitialUpdate() {
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DocAccessible::DoInitialUpdate();
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CacheViewport(true);
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}
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nsresult DocAccessibleWrap::HandleAccEvent(AccEvent* aEvent) {
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switch (aEvent->GetEventType()) {
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case nsIAccessibleEvent::EVENT_SCROLLING_END:
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CacheViewport(false);
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break;
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case nsIAccessibleEvent::EVENT_SCROLLING:
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UpdateFocusPathBounds();
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break;
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default:
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break;
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}
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return DocAccessible::HandleAccEvent(aEvent);
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}
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void DocAccessibleWrap::CacheViewportCallback(nsITimer* aTimer,
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void* aDocAccParam) {
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RefPtr<DocAccessibleWrap> docAcc(
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dont_AddRef(reinterpret_cast<DocAccessibleWrap*>(aDocAccParam)));
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if (!docAcc || docAcc->HasShutdown()) {
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return;
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}
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PresShell* presShell = docAcc->PresShellPtr();
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nsIFrame* rootFrame = presShell->GetRootFrame();
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if (!rootFrame) {
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return;
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}
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nsTArray<nsIFrame*> frames;
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nsIScrollableFrame* sf = presShell->GetRootScrollFrameAsScrollable();
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nsRect scrollPort = sf ? sf->GetScrollPortRect() : rootFrame->GetRect();
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nsLayoutUtils::GetFramesForArea(
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RelativeTo{presShell->GetRootFrame()}, scrollPort, frames,
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nsLayoutUtils::FrameForPointOption::OnlyVisible);
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AccessibleHashtable inViewAccs;
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for (size_t i = 0; i < frames.Length(); i++) {
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nsIContent* content = frames.ElementAt(i)->GetContent();
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if (!content) {
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continue;
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}
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Accessible* visibleAcc = docAcc->GetAccessibleOrContainer(content);
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if (!visibleAcc) {
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continue;
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}
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for (Accessible* acc = visibleAcc; acc && acc != docAcc->Parent();
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acc = acc->Parent()) {
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if (inViewAccs.Contains(acc->UniqueID())) {
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break;
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}
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inViewAccs.Put(acc->UniqueID(), RefPtr{acc});
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}
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}
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if (IPCAccessibilityActive()) {
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DocAccessibleChild* ipcDoc = docAcc->IPCDoc();
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nsTArray<BatchData> cacheData(inViewAccs.Count());
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for (auto iter = inViewAccs.Iter(); !iter.Done(); iter.Next()) {
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Accessible* accessible = iter.Data();
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nsAutoString name;
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accessible->Name(name);
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nsAutoString textValue;
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accessible->Value(textValue);
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nsAutoString nodeID;
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static_cast<AccessibleWrap*>(accessible)->WrapperDOMNodeID(nodeID);
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nsAutoString description;
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accessible->Description(description);
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cacheData.AppendElement(BatchData(
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accessible->Document()->IPCDoc(), UNIQUE_ID(accessible),
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accessible->State(), accessible->Bounds(), accessible->ActionCount(),
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name, textValue, nodeID, description, UnspecifiedNaN<double>(),
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UnspecifiedNaN<double>(), UnspecifiedNaN<double>(),
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UnspecifiedNaN<double>(), nsTArray<Attribute>()));
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}
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ipcDoc->SendBatch(eBatch_Viewport, cacheData);
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} else if (SessionAccessibility* sessionAcc =
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SessionAccessibility::GetInstanceFor(docAcc)) {
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nsTArray<AccessibleWrap*> accessibles(inViewAccs.Count());
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for (auto iter = inViewAccs.Iter(); !iter.Done(); iter.Next()) {
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accessibles.AppendElement(
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static_cast<AccessibleWrap*>(iter.Data().get()));
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}
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sessionAcc->ReplaceViewportCache(accessibles);
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}
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if (docAcc->mCachePivotBoundaries) {
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a11y::Pivot pivot(docAcc);
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TraversalRule rule(java::SessionAccessibility::HTML_GRANULARITY_DEFAULT);
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Accessible* first = pivot.First(rule);
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Accessible* last = pivot.Last(rule);
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// If first/last are null, pass the root document as pivot boundary.
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if (IPCAccessibilityActive()) {
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DocAccessibleChild* ipcDoc = docAcc->IPCDoc();
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ipcDoc->GetPlatformExtension()->SendSetPivotBoundaries(
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first ? first->Document()->IPCDoc() : ipcDoc, UNIQUE_ID(first),
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last ? last->Document()->IPCDoc() : ipcDoc, UNIQUE_ID(last));
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} else if (SessionAccessibility* sessionAcc =
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SessionAccessibility::GetInstanceFor(docAcc)) {
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sessionAcc->UpdateAccessibleFocusBoundaries(
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first ? static_cast<AccessibleWrap*>(first) : docAcc,
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last ? static_cast<AccessibleWrap*>(last) : docAcc);
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}
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docAcc->mCachePivotBoundaries = false;
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}
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if (docAcc->mCacheRefreshTimer) {
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docAcc->mCacheRefreshTimer = nullptr;
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}
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}
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void DocAccessibleWrap::CacheViewport(bool aCachePivotBoundaries) {
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mCachePivotBoundaries |= aCachePivotBoundaries;
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if (VirtualViewID() == kNoID && !mCacheRefreshTimer) {
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NS_NewTimerWithFuncCallback(getter_AddRefs(mCacheRefreshTimer),
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CacheViewportCallback, this,
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kCacheRefreshInterval, nsITimer::TYPE_ONE_SHOT,
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"a11y::DocAccessibleWrap::CacheViewport");
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if (mCacheRefreshTimer) {
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NS_ADDREF_THIS(); // Kung fu death grip
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}
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}
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}
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DocAccessibleWrap* DocAccessibleWrap::GetTopLevelContentDoc(
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AccessibleWrap* aAccessible) {
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DocAccessibleWrap* doc =
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static_cast<DocAccessibleWrap*>(aAccessible->Document());
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while (doc && doc->VirtualViewID() != kNoID) {
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doc = static_cast<DocAccessibleWrap*>(doc->ParentDocument());
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}
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return doc;
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}
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void DocAccessibleWrap::CacheFocusPath(AccessibleWrap* aAccessible) {
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mFocusPath.Clear();
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if (IPCAccessibilityActive()) {
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DocAccessibleChild* ipcDoc = IPCDoc();
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nsTArray<BatchData> cacheData;
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for (AccessibleWrap* acc = aAccessible; acc && acc != this->Parent();
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acc = static_cast<AccessibleWrap*>(acc->Parent())) {
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nsAutoString name;
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acc->Name(name);
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nsAutoString textValue;
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acc->Value(textValue);
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nsAutoString nodeID;
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acc->WrapperDOMNodeID(nodeID);
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nsAutoString description;
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acc->Description(description);
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nsCOMPtr<nsIPersistentProperties> props = acc->Attributes();
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nsTArray<Attribute> attributes;
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nsAccUtils::PersistentPropertiesToArray(props, &attributes);
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cacheData.AppendElement(
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BatchData(acc->Document()->IPCDoc(), UNIQUE_ID(acc), acc->State(),
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acc->Bounds(), acc->ActionCount(), name, textValue, nodeID,
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description, acc->CurValue(), acc->MinValue(),
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acc->MaxValue(), acc->Step(), attributes));
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mFocusPath.Put(acc->UniqueID(), RefPtr{acc});
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}
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ipcDoc->SendBatch(eBatch_FocusPath, cacheData);
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} else if (SessionAccessibility* sessionAcc =
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SessionAccessibility::GetInstanceFor(this)) {
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nsTArray<AccessibleWrap*> accessibles;
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for (AccessibleWrap* acc = aAccessible; acc && acc != this->Parent();
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acc = static_cast<AccessibleWrap*>(acc->Parent())) {
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accessibles.AppendElement(acc);
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mFocusPath.Put(acc->UniqueID(), RefPtr{acc});
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}
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sessionAcc->ReplaceFocusPathCache(accessibles);
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}
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}
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void DocAccessibleWrap::UpdateFocusPathBounds() {
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if (!mFocusPath.Count()) {
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return;
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}
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if (IPCAccessibilityActive()) {
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DocAccessibleChild* ipcDoc = IPCDoc();
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nsTArray<BatchData> boundsData(mFocusPath.Count());
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for (auto iter = mFocusPath.Iter(); !iter.Done(); iter.Next()) {
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Accessible* accessible = iter.Data();
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if (!accessible || accessible->IsDefunct()) {
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MOZ_ASSERT_UNREACHABLE("Focus path cached accessible is gone.");
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continue;
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}
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boundsData.AppendElement(
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BatchData(accessible->Document()->IPCDoc(), UNIQUE_ID(accessible), 0,
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accessible->Bounds(), 0, nsString(), nsString(), nsString(),
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nsString(), UnspecifiedNaN<double>(),
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UnspecifiedNaN<double>(), UnspecifiedNaN<double>(),
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UnspecifiedNaN<double>(), nsTArray<Attribute>()));
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}
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ipcDoc->SendBatch(eBatch_BoundsUpdate, boundsData);
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} else if (SessionAccessibility* sessionAcc =
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SessionAccessibility::GetInstanceFor(this)) {
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nsTArray<AccessibleWrap*> accessibles(mFocusPath.Count());
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for (auto iter = mFocusPath.Iter(); !iter.Done(); iter.Next()) {
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Accessible* accessible = iter.Data();
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if (!accessible || accessible->IsDefunct()) {
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MOZ_ASSERT_UNREACHABLE("Focus path cached accessible is gone.");
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continue;
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}
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accessibles.AppendElement(static_cast<AccessibleWrap*>(accessible));
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}
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sessionAcc->UpdateCachedBounds(accessibles);
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}
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}
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#undef UNIQUE_ID |