The Tor Browser: accessible/src/html/HTMLListAccessible.cpp@97036ab72558 (annotated)

accessible/src/html/HTMLListAccessible.cpp@97036ab72558 (annotated)

accessible/src/html/HTMLListAccessible.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: 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 "HTMLListAccessible.h"
 #include "DocAccessible.h"
 #include "nsAccUtils.h"
 #include "Role.h"
 #include "States.h"
 #include "nsBlockFrame.h"
 #include "nsBulletFrame.h"
 using namespace mozilla;
 using namespace mozilla::a11y;
 ////////////////////////////////////////////////////////////////////////////////
 // HTMLListAccessible
 ////////////////////////////////////////////////////////////////////////////////
 NS_IMPL_ISUPPORTS_INHERITED0(HTMLListAccessible, HyperTextAccessible)
 role
 HTMLListAccessible::NativeRole()
 {
   if (mContent->Tag() == nsGkAtoms::dl)
     return roles::DEFINITION_LIST;
   return roles::LIST;
 }
 uint64_t
 HTMLListAccessible::NativeState()
 {
   return HyperTextAccessibleWrap::NativeState() | states::READONLY;
 }
 ////////////////////////////////////////////////////////////////////////////////
 // HTMLLIAccessible
 ////////////////////////////////////////////////////////////////////////////////
 HTMLLIAccessible::
   HTMLLIAccessible(nsIContent* aContent, DocAccessible* aDoc) :
   HyperTextAccessibleWrap(aContent, aDoc), mBullet(nullptr)
 {
   mType = eHTMLLiType;
   nsBlockFrame* blockFrame = do_QueryFrame(GetFrame());
   if (blockFrame && blockFrame->HasBullet()) {
     mBullet = new HTMLListBulletAccessible(mContent, mDoc);
     Document()->BindToDocument(mBullet, nullptr);
   }
 }
 NS_IMPL_ISUPPORTS_INHERITED0(HTMLLIAccessible, HyperTextAccessible)
 void
 HTMLLIAccessible::Shutdown()
 {
   mBullet = nullptr;
   HyperTextAccessibleWrap::Shutdown();
 }
 role
 HTMLLIAccessible::NativeRole()
 {
   if (mContent->Tag() == nsGkAtoms::dt)
     return roles::TERM;
   return roles::LISTITEM;
 }
 uint64_t
 HTMLLIAccessible::NativeState()
 {
   return HyperTextAccessibleWrap::NativeState() | states::READONLY;
 }
 NS_IMETHODIMP
 HTMLLIAccessible::GetBounds(int32_t* aX, int32_t* aY,
                             int32_t* aWidth, int32_t* aHeight)
 {
   nsresult rv = AccessibleWrap::GetBounds(aX, aY, aWidth, aHeight);
   if (NS_FAILED(rv) || !mBullet || mBullet->IsInside())
     return rv;
   int32_t bulletX = 0, bulletY = 0, bulletWidth = 0, bulletHeight = 0;
   rv = mBullet->GetBounds(&bulletX, &bulletY, &bulletWidth, &bulletHeight);
   NS_ENSURE_SUCCESS(rv, rv);
   *aWidth += *aX - bulletX;
   *aX = bulletX; // Move x coordinate of list item over to cover bullet as well
   return NS_OK;
 }
 ////////////////////////////////////////////////////////////////////////////////
 // HTMLLIAccessible: public
 void
 HTMLLIAccessible::UpdateBullet(bool aHasBullet)
 {
   if (aHasBullet == !!mBullet) {
     NS_NOTREACHED("Bullet and accessible are in sync already!");
     return;
   }
   DocAccessible* document = Document();
   if (aHasBullet) {
     mBullet = new HTMLListBulletAccessible(mContent, mDoc);
     document->BindToDocument(mBullet, nullptr);
     InsertChildAt(0, mBullet);
   } else {
     RemoveChild(mBullet);
     document->UnbindFromDocument(mBullet);
     mBullet = nullptr;
   }
   // XXXtodo: fire show/hide and reorder events. That's hard to make it
   // right now because coalescence happens by DOM node.
 }
 ////////////////////////////////////////////////////////////////////////////////
 // HTMLLIAccessible: Accessible protected
 void
 HTMLLIAccessible::CacheChildren()
 {
   if (mBullet)
     AppendChild(mBullet);
   // Cache children from subtree.
   AccessibleWrap::CacheChildren();
 }
 ////////////////////////////////////////////////////////////////////////////////
 // HTMLListBulletAccessible
 ////////////////////////////////////////////////////////////////////////////////
 HTMLListBulletAccessible::
   HTMLListBulletAccessible(nsIContent* aContent, DocAccessible* aDoc) :
   LeafAccessible(aContent, aDoc)
 {
   mStateFlags |= eSharedNode;
 }
 ////////////////////////////////////////////////////////////////////////////////
 // HTMLListBulletAccessible: Accessible
 nsIFrame*
 HTMLListBulletAccessible::GetFrame() const
 {
   nsBlockFrame* blockFrame = do_QueryFrame(mContent->GetPrimaryFrame());
   return blockFrame ? blockFrame->GetBullet() : nullptr;
 }
 ENameValueFlag
 HTMLListBulletAccessible::Name(nsString &aName)
 {
   aName.Truncate();
   // Native anonymous content, ARIA can't be used. Get list bullet text.
   nsBlockFrame* blockFrame = do_QueryFrame(mContent->GetPrimaryFrame());
   if (blockFrame) {
     blockFrame->GetBulletText(aName);
     // Append space otherwise bullets are jammed up against list text.
     aName.Append(' ');
   }
   return eNameOK;
 }
 role
 HTMLListBulletAccessible::NativeRole()
 {
   return roles::STATICTEXT;
 }
 uint64_t
 HTMLListBulletAccessible::NativeState()
 {
   return LeafAccessible::NativeState() | states::READONLY;
 }
 void
 HTMLListBulletAccessible::AppendTextTo(nsAString& aText, uint32_t aStartOffset,
                                        uint32_t aLength)
 {
   nsAutoString bulletText;
   nsBlockFrame* blockFrame = do_QueryFrame(mContent->GetPrimaryFrame());
   if (blockFrame)
     blockFrame->GetBulletText(bulletText);
   aText.Append(Substring(bulletText, aStartOffset, aLength));
 }
 ////////////////////////////////////////////////////////////////////////////////
 // HTMLListBulletAccessible: public
 bool
 HTMLListBulletAccessible::IsInside() const
 {
   nsBlockFrame* blockFrame = do_QueryFrame(mContent->GetPrimaryFrame());
   return blockFrame ? blockFrame->HasInsideBullet() : false;
 }

The Tor Browser / annotate

accessible/src/html/HTMLListAccessible.cpp@97036ab72558 (annotated)

accessible/src/html/HTMLListAccessible.cpp