src/content/public/browser/screen_orientation_provider.h

   1 // Copyright 2014 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef CONTENT_PUBLIC_BROWSER_SCREEN_ORIENTATION_PROVIDER_H_
   6 #define CONTENT_PUBLIC_BROWSER_SCREEN_ORIENTATION_PROVIDER_H_
   7
   8 #include "base/macros.h"
   9 #include "base/memory/scoped_ptr.h"
  10 #include "content/common/content_export.h"
  11 #include "content/public/browser/web_contents_observer.h"
  12 #include "third_party/WebKit/public/platform/WebScreenOrientationLockType.h"
  13
  14 namespace content {
  15
  16 class ScreenOrientationDelegate;
  17 class ScreenOrientationDispatcherHost;
  18 class WebContents;
  19
  20 // Handles screen orientation lock/unlock. Platforms which wish to provide
  21 // custom implementations can provide a factory for ScreenOrientationDelegate.
  22 class CONTENT_EXPORT ScreenOrientationProvider : public WebContentsObserver {
  23  public:
  24   ScreenOrientationProvider(ScreenOrientationDispatcherHost* dispatcher_host,
  25                             WebContents* web_contents);
  26   ~ScreenOrientationProvider() override;
  27
  28   // Lock the screen orientation to |orientations|.
  29   void LockOrientation(int request_id,
  30                        blink::WebScreenOrientationLockType lock_orientation);
  31
  32   // Unlock the screen orientation.
  33   void UnlockOrientation();
  34
  35   // Inform about a screen orientation update. It is called to let the provider
  36   // know if a lock has been resolved.
  37   void OnOrientationChange();
  38
  39   // Provide a delegate which creates delegates for platform implementations.
  40   // The delegate is not owned by ScreenOrientationProvider.
  41   static void SetDelegate(ScreenOrientationDelegate* delegate_);
  42
  43   // WebContentsObserver
  44   void DidToggleFullscreenModeForTab(bool entered_fullscreen) override;
  45
  46  private:
  47   struct LockInformation {
  48     LockInformation(int request_id, blink::WebScreenOrientationLockType lock);
  49     int request_id;
  50     blink::WebScreenOrientationLockType lock;
  51   };
  52
  53   // Returns the lock type that should be associated with 'natural' lock.
  54   // Returns WebScreenOrientationLockDefault if the natural lock type can't be
  55   // found.
  56   blink::WebScreenOrientationLockType GetNaturalLockType() const;
  57
  58   // Whether the passed |lock| matches the current orientation. In other words,
  59   // whether the orientation will need to change to match the |lock|.
  60   bool LockMatchesCurrentOrientation(blink::WebScreenOrientationLockType lock);
  61
  62   // Not owned, responsible for platform implementations.
  63   static ScreenOrientationDelegate* delegate_;
  64
  65   // ScreenOrientationDispatcherHost owns ScreenOrientationProvider.
  66   ScreenOrientationDispatcherHost* dispatcher_;
  67
  68   // Whether the ScreenOrientationProvider currently has a lock applied.
  69   bool lock_applied_;
  70
  71   // Locks that require orientation changes are not completed until
  72   // OnOrientationChange.
  73   scoped_ptr<LockInformation> pending_lock_;
  74
  75   DISALLOW_COPY_AND_ASSIGN(ScreenOrientationProvider);
  76 };
  77
  78 } // namespace content
  79
  80 #endif // CONTENT_PUBLIC_BROWSER_SCREEN_ORIENTATION_PROVIDER_H_