palemoon-dev/platform/accessible/ipc/DocAccessibleChildBase.h

/* -*- Mode: C++; tab-width: 2; 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/. */

#ifndef mozilla_a11y_DocAccessibleChildBase_h
#define mozilla_a11y_DocAccessibleChildBase_h

#include "mozilla/a11y/DocAccessible.h"
#include "mozilla/a11y/PDocAccessibleChild.h"
#include "mozilla/Unused.h"
#include "nsISupportsImpl.h"

namespace mozilla {
namespace a11y {

class Accessible;
class AccShowEvent;

class DocAccessibleChildBase : public PDocAccessibleChild
{
public:
  explicit DocAccessibleChildBase(DocAccessible* aDoc)
    : mDoc(aDoc)
  {
    MOZ_COUNT_CTOR(DocAccessibleChildBase);
  }

  ~DocAccessibleChildBase()
  {
    // Shutdown() should have been called, but maybe it isn't if the process is
    // killed?
    MOZ_ASSERT(!mDoc);
    if (mDoc) {
      mDoc->SetIPCDoc(nullptr);
    }

    MOZ_COUNT_DTOR(DocAccessibleChildBase);
  }

  virtual void Shutdown()
  {
    DetachDocument();
    SendShutdown();
  }

  void ShowEvent(AccShowEvent* aShowEvent);

  virtual void ActorDestroy(ActorDestroyReason) override
  {
    if (!mDoc) {
      return;
    }

    mDoc->SetIPCDoc(nullptr);
    mDoc = nullptr;
  }

protected:
  static uint32_t InterfacesFor(Accessible* aAcc);
  static void SerializeTree(Accessible* aRoot, nsTArray<AccessibleData>& aTree);

  virtual void MaybeSendShowEvent(ShowEventData& aData, bool aFromUser)
  { Unused << SendShowEvent(aData, aFromUser); }

  void DetachDocument()
  {
    if (mDoc) {
      mDoc->SetIPCDoc(nullptr);
      mDoc = nullptr;
    }
  }

  DocAccessible*  mDoc;
};

} // namespace a11y
} // namespace mozilla

#endif // mozilla_a11y_DocAccessibleChildBase_h