accessible/src/msaa/HyperTextAccessibleWrap.cpp
author David Anderson <danderson@mozilla.com>
Wed, 22 Aug 2012 16:09:24 -0700
changeset 113574 c4f83d9d8243f3f853a5356188164a5fddee2b5a
parent 113402 7aa128dbd1a9e5b9272376aa9a1f4aa23afd8787
parent 108991 a16372ce30b5f6b747246b01fcd215a4bf3b6342
child 122283 5cb2cc9be615d66b1eb96843a4c8c45b9b60e29d
permissions -rw-r--r--
Merge from mozilla-central.

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim:expandtab:shiftwidth=2:tabstop=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 "HyperTextAccessibleWrap.h"

#include "nsEventShell.h"

NS_IMPL_ISUPPORTS_INHERITED0(HyperTextAccessibleWrap,
                             HyperTextAccessible)

STDMETHODIMP
HyperTextAccessibleWrap::QueryInterface(REFIID aIID, void** aInstancePtr)
{
  if (!aInstancePtr)
    return E_FAIL;

  *aInstancePtr = NULL;

  if (IsTextRole()) {
    if (aIID == IID_IAccessibleText)
      *aInstancePtr =
        static_cast<IAccessibleText*>(static_cast<ia2AccessibleText*>(this));
    else if (aIID == IID_IAccessibleHypertext)
      *aInstancePtr = static_cast<IAccessibleHypertext*>(this);
    else if (aIID == IID_IAccessibleEditableText)
      *aInstancePtr = static_cast<IAccessibleEditableText*>(this);

    if (*aInstancePtr) {
      AddRef();
      return S_OK;
    }
  }

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

nsresult
HyperTextAccessibleWrap::HandleAccEvent(AccEvent* aEvent)
{
  uint32_t eventType = aEvent->GetEventType();

  if (eventType == nsIAccessibleEvent::EVENT_TEXT_REMOVED ||
      eventType == nsIAccessibleEvent::EVENT_TEXT_INSERTED) {
    Accessible* accessible = aEvent->GetAccessible();
    if (accessible) {
      nsCOMPtr<nsIWinAccessNode> winAccessNode(do_QueryObject(accessible));
      if (winAccessNode) {
        void *instancePtr = NULL;
        nsresult rv = winAccessNode->QueryNativeInterface(IID_IAccessibleText,
                                                          &instancePtr);
        if (NS_SUCCEEDED(rv)) {
          NS_IF_RELEASE(gTextEvent);
          NS_IF_ADDREF(gTextEvent = downcast_accEvent(aEvent));

          (static_cast<IUnknown*>(instancePtr))->Release();
        }
      }
    }
  }

  return HyperTextAccessible::HandleAccEvent(aEvent);
}

nsresult
HyperTextAccessibleWrap::GetModifiedText(bool aGetInsertedText,
                                         nsAString& aText,
                                         uint32_t* aStartOffset,
                                         uint32_t* aEndOffset)
{
  aText.Truncate();
  *aStartOffset = 0;
  *aEndOffset = 0;

  if (!gTextEvent)
    return NS_OK;

  bool isInserted = gTextEvent->IsTextInserted();
  if (aGetInsertedText != isInserted)
    return NS_OK;

  Accessible* targetAcc = gTextEvent->GetAccessible();
  if (targetAcc != this)
    return NS_OK;

  *aStartOffset = gTextEvent->GetStartOffset();
  *aEndOffset = *aStartOffset + gTextEvent->GetLength();
  gTextEvent->GetModifiedText(aText);

  return NS_OK;
}