ZoomConstraintsClient.h

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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */

/* vim: set ts=8 sts=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/. */

#ifndef ZoomConstraintsClient_h_

#define ZoomConstraintsClient_h_

#include "mozilla/layers/ScrollableLayerGuid.h"

#include "mozilla/layers/ZoomConstraints.h"

#include "mozilla/Maybe.h"

#include "nsCOMPtr.h"

#include "nsIDOMEventListener.h"

#include "nsIObserver.h"

namespace mozilla {

class PresShell;

namespace dom {

class Document;

class EventTarget;

}  // namespace dom

}  // namespace mozilla

class ZoomConstraintsClient final : public nsIDOMEventListener,

                                    public nsIObserver {

 public:

  NS_DECL_ISUPPORTS

  NS_DECL_NSIDOMEVENTLISTENER

  NS_DECL_NSIOBSERVER

  ZoomConstraintsClient();

 private:

  ~ZoomConstraintsClient();

 public:

  void Init(mozilla::PresShell* aPresShell, mozilla::dom::Document* aDocument);

  void Destroy();

  void ScreenSizeChanged();

  bool GetAllowZoom() const { return mZoomConstraints.mAllowZoom; }

 private:

  void RefreshZoomConstraints();

  RefPtr<mozilla::dom::Document> mDocument;

  // raw ref since the presShell owns this

  mozilla::PresShell* MOZ_NON_OWNING_REF mPresShell;

  nsCOMPtr<mozilla::dom::EventTarget> mEventTarget;

  mozilla::Maybe<mozilla::layers::ScrollableLayerGuid> mGuid;

  mozilla::layers::ZoomConstraints mZoomConstraints;

};

#endif