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/Maybe.h"
  12 #include "nsCOMPtr.h"
  13 #include "nsIDOMEventListener.h"
  14 #include "nsIObserver.h"
  15
  16 namespace mozilla {
  17 class PresShell;
  18 namespace dom {
  19 class EventTarget;
  20 }  // namespace dom
  21 }  // namespace mozilla
  22
  23 class ZoomConstraintsClient final : public nsIDOMEventListener,
  24                                     public nsIObserver {
  25  public:
  26   NS_DECL_ISUPPORTS
  27   NS_DECL_NSIDOMEVENTLISTENER
  28   NS_DECL_NSIOBSERVER
  29
  30   ZoomConstraintsClient();
  31
  32  private:
  33   ~ZoomConstraintsClient();
  34
  35  public:
  36   void Init(mozilla::PresShell* aPresShell, mozilla::dom::Document* aDocument);
  37   void Destroy();
  38   void ScreenSizeChanged();
  39
  40  private:
  41   void RefreshZoomConstraints();
  42
  43   RefPtr<mozilla::dom::Document> mDocument;
  44   // raw ref since the presShell owns this
  45   mozilla::PresShell* MOZ_NON_OWNING_REF mPresShell;
  46   nsCOMPtr<mozilla::dom::EventTarget> mEventTarget;
  47   mozilla::Maybe<mozilla::layers::ScrollableLayerGuid> mGuid;
  48 };
  49
  50 #endif