The Tor Browser: accessible/src/windows/msaa/HyperTextAccessibleWrap.cpp@97036ab72558

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.

     1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */

     2 /* vim:expandtab:shiftwidth=2:tabstop=2:

     3  */

     4 /* This Source Code Form is subject to the terms of the Mozilla Public

     5  * License, v. 2.0. If a copy of the MPL was not distributed with this

     6  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

     8 #include "HyperTextAccessibleWrap.h"

     9 #include "Accessible-inl.h"

    11 #include "nsEventShell.h"

    13 #include "mozilla/StaticPtr.h"

    15 using namespace mozilla;

    16 using namespace mozilla::a11y;

    18 StaticRefPtr<Accessible> HyperTextAccessibleWrap::sLastTextChangeAcc;

    19 StaticAutoPtr<nsString> HyperTextAccessibleWrap::sLastTextChangeString;

    20 uint32_t HyperTextAccessibleWrap::sLastTextChangeStart = 0;

    21 uint32_t HyperTextAccessibleWrap::sLastTextChangeEnd = 0;

    22 bool HyperTextAccessibleWrap::sLastTextChangeWasInsert = false;

    24 NS_IMPL_ISUPPORTS_INHERITED0(HyperTextAccessibleWrap,

    25                              HyperTextAccessible)

    27 STDMETHODIMP

    28 HyperTextAccessibleWrap::QueryInterface(REFIID aIID, void** aInstancePtr)

    29 {

    30   if (!aInstancePtr)

    31     return E_FAIL;

    33   *aInstancePtr = nullptr;

    35   if (IsTextRole()) {

    36     if (aIID == IID_IAccessibleText)

    37       *aInstancePtr =

    38         static_cast<IAccessibleText*>(static_cast<ia2AccessibleText*>(this));

    39     else if (aIID == IID_IAccessibleHypertext)

    40       *aInstancePtr = static_cast<IAccessibleHypertext*>(this);

    41     else if (aIID == IID_IAccessibleEditableText)

    42       *aInstancePtr = static_cast<IAccessibleEditableText*>(this);

    44     if (*aInstancePtr) {

    45       AddRef();

    46       return S_OK;

    47     }

    48   }

    50   return AccessibleWrap::QueryInterface(aIID, aInstancePtr);

    51 }

    53 nsresult

    54 HyperTextAccessibleWrap::HandleAccEvent(AccEvent* aEvent)

    55 {

    56   uint32_t eventType = aEvent->GetEventType();

    58   if (eventType == nsIAccessibleEvent::EVENT_TEXT_REMOVED ||

    59       eventType == nsIAccessibleEvent::EVENT_TEXT_INSERTED) {

    60     Accessible* accessible = aEvent->GetAccessible();

    61     if (accessible && accessible->IsHyperText()) {

    62       sLastTextChangeAcc = accessible;

    63       if (!sLastTextChangeString)

    64         sLastTextChangeString = new nsString();

    66       AccTextChangeEvent* event = downcast_accEvent(aEvent);

    67       event->GetModifiedText(*sLastTextChangeString);

    68       sLastTextChangeStart = event->GetStartOffset();

    69       sLastTextChangeEnd = sLastTextChangeStart + event->GetLength();

    70       sLastTextChangeWasInsert = event->IsTextInserted();

    71     }

    72   }

    74   return HyperTextAccessible::HandleAccEvent(aEvent);

    75 }

    77 nsresult

    78 HyperTextAccessibleWrap::GetModifiedText(bool aGetInsertedText,

    79                                          nsAString& aText,

    80                                          uint32_t* aStartOffset,

    81                                          uint32_t* aEndOffset)

    82 {

    83   aText.Truncate();

    84   *aStartOffset = 0;

    85   *aEndOffset = 0;

    87   if (!sLastTextChangeAcc)

    88     return NS_OK;

    90   if (aGetInsertedText != sLastTextChangeWasInsert)

    91     return NS_OK;

    93   if (sLastTextChangeAcc != this)

    94     return NS_OK;

    96   *aStartOffset = sLastTextChangeStart;

    97   *aEndOffset = sLastTextChangeEnd;

    98   aText.Append(*sLastTextChangeString);

   100   return NS_OK;

   101 }

The Tor Browser / file revision

accessible/src/windows/msaa/HyperTextAccessibleWrap.cpp@97036ab72558

accessible/src/windows/msaa/HyperTextAccessibleWrap.cpp