content/browser/screen_orientation/screen_orientation_provider_android.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_BROWSER_SCREEN_ORIENTATION_SCREEN_ORIENTATION_PROVIDER_ANDROID_H_
   6 #define CONTENT_BROWSER_SCREEN_ORIENTATION_SCREEN_ORIENTATION_PROVIDER_ANDROID_H_
   7
   8 #include <jni.h>
   9
  10 #include "base/compiler_specific.h"
  11 #include "content/browser/screen_orientation/screen_orientation_provider.h"
  12 #include "content/public/browser/web_contents_observer.h"
  13
  14 namespace content {
  15
  16 class WebContentsImpl;
  17
  18 class ScreenOrientationProviderAndroid : public ScreenOrientationProvider,
  19                                          public WebContentsObserver {
  20  public:
  21   explicit ScreenOrientationProviderAndroid(
  22       ScreenOrientationDispatcherHost* dispatcher,
  23       WebContents* web_contents);
  24
  25   static bool Register(JNIEnv* env);
  26
  27   // ScreenOrientationProvider
  28   virtual void LockOrientation(int request_id,
  29                                blink::WebScreenOrientationLockType) OVERRIDE;
  30   virtual void UnlockOrientation() OVERRIDE;
  31   virtual void OnOrientationChange() OVERRIDE;
  32
  33   // WebContentsObserver
  34   virtual void DidToggleFullscreenModeForTab(bool entered_fullscreen) OVERRIDE;
  35
  36   // Ask the ScreenOrientationListener (Java) to start accurately listening to
  37   // the screen orientation. It keep track of the number of start request if it
  38   // is already running an accurate listening.
  39   static void StartAccurateListening();
  40
  41   // Ask the ScreenOrientationListener (Java) to stop accurately listening to
  42   // the screen orientation. It will actually stop only if the number of stop
  43   // requests matches the number of start requests.
  44   static void StopAccurateListening();
  45
  46  private:
  47   WebContentsImpl* web_contents_impl();
  48
  49   // Whether the passed |lock| matches the current orientation. In other words,
  50   // whether the orientation will need to change to match the |lock|.
  51   bool LockMatchesCurrentOrientation(blink::WebScreenOrientationLockType lock);
  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   virtual ~ScreenOrientationProviderAndroid();
  59
  60   // ScreenOrientationDispatcherHost owns ScreenOrientationProvider so
  61   // dispatcher_ should not point to an invalid memory.
  62   ScreenOrientationDispatcherHost* dispatcher_;
  63
  64   // Whether the ScreenOrientationProvider currently has a lock applied.
  65   bool lock_applied_;
  66
  67   struct LockInformation {
  68     LockInformation(int request_id, blink::WebScreenOrientationLockType lock);
  69     int request_id;
  70     blink::WebScreenOrientationLockType lock;
  71   };
  72   LockInformation* pending_lock_;
  73
  74   DISALLOW_COPY_AND_ASSIGN(ScreenOrientationProviderAndroid);
  75 };
  76
  77 } // namespace content
  78
  79 #endif // CONTENT_BROWSER_SCREEN_ORIENTATION_SCREEN_ORIENTATION_PROVIDER_ANDROID_H_