layout/base/ZoomConstraintsClient.h

   1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
   3 /* This Source Code Form is subject to the terms of the Mozilla Public
   4  * License, v. 2.0. If a copy of the MPL was not distributed with this
   5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   6
   7 #ifndef ZoomConstraintsClient_h_
   8 #define ZoomConstraintsClient_h_
   9
  10 #include "mozilla/layers/ScrollableLayerGuid.h"
  11 #include "mozilla/layers/ZoomConstraints.h"
  12 #include "mozilla/Maybe.h"
  13 #include "nsCOMPtr.h"
  14 #include "nsIDOMEventListener.h"
  15 #include "nsIObserver.h"
  16
  17 namespace mozilla {
  18 class PresShell;
  19 namespace dom {
  20 class Document;
  21 class EventTarget;
  22 }  // namespace dom
  23 }  // namespace mozilla
  24
  25 class ZoomConstraintsClient final : public nsIDOMEventListener,
  26                                     public nsIObserver {
  27  public:
  28   NS_DECL_ISUPPORTS
  29   NS_DECL_NSIDOMEVENTLISTENER
  30   NS_DECL_NSIOBSERVER
  31
  32   ZoomConstraintsClient();
  33
  34  private:
  35   ~ZoomConstraintsClient();
  36
  37  public:
  38   void Init(mozilla::PresShell* aPresShell, mozilla::dom::Document* aDocument);
  39   void Destroy();
  40   void ScreenSizeChanged();
  41
  42   bool GetAllowZoom() const { return mZoomConstraints.mAllowZoom; }
  43
  44  private:
  45   void RefreshZoomConstraints();
  46
  47   RefPtr<mozilla::dom::Document> mDocument;
  48   // raw ref since the presShell owns this
  49   mozilla::PresShell* MOZ_NON_OWNING_REF mPresShell;
  50   nsCOMPtr<mozilla::dom::EventTarget> mEventTarget;
  51   mozilla::Maybe<mozilla::layers::ScrollableLayerGuid> mGuid;
  52   mozilla::layers::ZoomConstraints mZoomConstraints;
  53 };
  54
  55 #endif