The Tor Browser: accessible/src/base/SelectionManager.cpp@97036ab72558 (annotated)

accessible/src/base/SelectionManager.cpp@97036ab72558 (annotated)

accessible/src/base/SelectionManager.cpp

Tue, 06 Jan 2015 21:39:09 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Tue, 06 Jan 2015 21:39:09 +0100
branch: TOR_BUG_9701
changeset 8: 97036ab72558
permissions: -rw-r--r--

Conditionally force memory storage according to privacy.thirdparty.isolate;
This solves Tor bug #9701, complying with disk avoidance documented in
https://www.torproject.org/projects/torbrowser/design/#disk-avoidance.

 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
 /* 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 "mozilla/a11y/SelectionManager.h"
 #include "DocAccessible-inl.h"
 #include "nsAccessibilityService.h"
 #include "nsAccUtils.h"
 #include "nsCoreUtils.h"
 #include "nsEventShell.h"
 #include "nsIAccessibleTypes.h"
 #include "nsIDOMDocument.h"
 #include "nsIPresShell.h"
 #include "mozilla/dom/Selection.h"
 #include "mozilla/dom/Element.h"
 using namespace mozilla;
 using namespace mozilla::a11y;
 using mozilla::dom::Selection;
 struct mozilla::a11y::SelData MOZ_FINAL
 {
   SelData(Selection* aSel, int32_t aReason) :
     mSel(aSel), mReason(aReason) {}
   nsRefPtr<Selection> mSel;
   int16_t mReason;
   NS_INLINE_DECL_REFCOUNTING(SelData)
 private:
   // Private destructor, to discourage deletion outside of Release():
   ~SelData() {}
 };
 void
 SelectionManager::ClearControlSelectionListener()
 {
   if (!mCurrCtrlFrame)
     return;
   const nsFrameSelection* frameSel = mCurrCtrlFrame->GetConstFrameSelection();
   NS_ASSERTION(frameSel, "No frame selection for the element!");
   mCurrCtrlFrame = nullptr;
   if (!frameSel)
     return;
   // Remove 'this' registered as selection listener for the normal selection.
   Selection* normalSel =
     frameSel->GetSelection(nsISelectionController::SELECTION_NORMAL);
   normalSel->RemoveSelectionListener(this);
   // Remove 'this' registered as selection listener for the spellcheck
   // selection.
   Selection* spellSel =
     frameSel->GetSelection(nsISelectionController::SELECTION_SPELLCHECK);
   spellSel->RemoveSelectionListener(this);
 }
 void
 SelectionManager::SetControlSelectionListener(dom::Element* aFocusedElm)
 {
   // When focus moves such that the caret is part of a new frame selection
   // this removes the old selection listener and attaches a new one for
   // the current focus.
   ClearControlSelectionListener();
   mCurrCtrlFrame = aFocusedElm->GetPrimaryFrame();
   if (!mCurrCtrlFrame)
     return;
   const nsFrameSelection* frameSel = mCurrCtrlFrame->GetConstFrameSelection();
   NS_ASSERTION(frameSel, "No frame selection for focused element!");
   if (!frameSel)
     return;
   // Register 'this' as selection listener for the normal selection.
   Selection* normalSel =
     frameSel->GetSelection(nsISelectionController::SELECTION_NORMAL);
   normalSel->AddSelectionListener(this);
   // Register 'this' as selection listener for the spell check selection.
   Selection* spellSel =
     frameSel->GetSelection(nsISelectionController::SELECTION_SPELLCHECK);
   spellSel->AddSelectionListener(this);
 }
 void
 SelectionManager::AddDocSelectionListener(nsIPresShell* aPresShell)
 {
   const nsFrameSelection* frameSel = aPresShell->ConstFrameSelection();
   // Register 'this' as selection listener for the normal selection.
   Selection* normalSel =
     frameSel->GetSelection(nsISelectionController::SELECTION_NORMAL);
   normalSel->AddSelectionListener(this);
   // Register 'this' as selection listener for the spell check selection.
   Selection* spellSel =
     frameSel->GetSelection(nsISelectionController::SELECTION_SPELLCHECK);
   spellSel->AddSelectionListener(this);
 }
 void
 SelectionManager::RemoveDocSelectionListener(nsIPresShell* aPresShell)
 {
   const nsFrameSelection* frameSel = aPresShell->ConstFrameSelection();
   // Remove 'this' registered as selection listener for the normal selection.
   Selection* normalSel =
     frameSel->GetSelection(nsISelectionController::SELECTION_NORMAL);
   normalSel->RemoveSelectionListener(this);
   // Remove 'this' registered as selection listener for the spellcheck
   // selection.
   Selection* spellSel =
     frameSel->GetSelection(nsISelectionController::SELECTION_SPELLCHECK);
   spellSel->RemoveSelectionListener(this);
 }
 void
 SelectionManager::ProcessTextSelChangeEvent(AccEvent* aEvent)
 {
   // Fire selection change event if it's not pure caret-move selection change,
   // i.e. the accessible has or had not collapsed selection.
   AccTextSelChangeEvent* event = downcast_accEvent(aEvent);
   if (!event->IsCaretMoveOnly())
     nsEventShell::FireEvent(aEvent);
   // Fire caret move event if there's a caret in the selection.
   nsINode* caretCntrNode =
     nsCoreUtils::GetDOMNodeFromDOMPoint(event->mSel->GetFocusNode(),
                                         event->mSel->FocusOffset());
   if (!caretCntrNode)
     return;
   HyperTextAccessible* caretCntr = nsAccUtils::GetTextContainer(caretCntrNode);
   NS_ASSERTION(caretCntr,
                "No text container for focus while there's one for common ancestor?!");
   if (!caretCntr)
     return;
   int32_t caretOffset = caretCntr->CaretOffset();
   if (caretOffset != -1) {
     nsRefPtr<AccCaretMoveEvent> caretMoveEvent =
       new AccCaretMoveEvent(caretCntr, caretOffset, aEvent->FromUserInput());
     nsEventShell::FireEvent(caretMoveEvent);
   }
 }
 NS_IMETHODIMP
 SelectionManager::NotifySelectionChanged(nsIDOMDocument* aDOMDocument,
                                          nsISelection* aSelection,
                                          int16_t aReason)
 {
   NS_ENSURE_ARG(aDOMDocument);
   nsCOMPtr<nsIDocument> documentNode(do_QueryInterface(aDOMDocument));
   DocAccessible* document = GetAccService()->GetDocAccessible(documentNode);
 #ifdef A11Y_LOG
   if (logging::IsEnabled(logging::eSelection))
     logging::SelChange(aSelection, document, aReason);
 #endif
   // Don't fire events until document is loaded.
   if (document && document->IsContentLoaded()) {
     // Selection manager has longer lifetime than any document accessible,
     // so that we are guaranteed that the notification is processed before
     // the selection manager is destroyed.
     nsRefPtr<SelData> selData =
       new SelData(static_cast<Selection*>(aSelection), aReason);
     document->HandleNotification<SelectionManager, SelData>
       (this, &SelectionManager::ProcessSelectionChanged, selData);
   }
   return NS_OK;
 }
 void
 SelectionManager::ProcessSelectionChanged(SelData* aSelData)
 {
   Selection* selection = aSelData->mSel;
   if (!selection->GetPresShell())
     return;
   const nsRange* range = selection->GetAnchorFocusRange();
   nsINode* cntrNode = nullptr;
   if (range)
     cntrNode = range->GetCommonAncestor();
   if (!cntrNode) {
     cntrNode = selection->GetFrameSelection()->GetAncestorLimiter();
     if (!cntrNode) {
       cntrNode = selection->GetPresShell()->GetDocument();
       NS_ASSERTION(aSelData->mSel->GetPresShell()->ConstFrameSelection() == selection->GetFrameSelection(),
                    "Wrong selection container was used!");
     }
   }
   HyperTextAccessible* text = nsAccUtils::GetTextContainer(cntrNode);
   if (!text) {
     NS_NOTREACHED("We must reach document accessible implementing text interface!");
     return;
   }
   if (selection->GetType() == nsISelectionController::SELECTION_NORMAL) {
     nsRefPtr<AccEvent> event =
       new AccTextSelChangeEvent(text, selection, aSelData->mReason);
     text->Document()->FireDelayedEvent(event);
   } else if (selection->GetType() == nsISelectionController::SELECTION_SPELLCHECK) {
     // XXX: fire an event for container accessible of the focus/anchor range
     // of the spelcheck selection.
     text->Document()->FireDelayedEvent(nsIAccessibleEvent::EVENT_TEXT_ATTRIBUTE_CHANGED,
                                        text);
   }
 }

The Tor Browser / annotate

accessible/src/base/SelectionManager.cpp@97036ab72558 (annotated)

accessible/src/base/SelectionManager.cpp