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