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// Copyright 2016 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CHROMECAST_BROWSER_CAST_MEDIA_BLOCKER_H_
#define CHROMECAST_BROWSER_CAST_MEDIA_BLOCKER_H_
#include "base/macros.h"
#include "base/callback_forward.h"
#include "content/public/browser/web_contents_observer.h"
namespace content {
class WebContents;
} // namespace content
namespace chromecast {
namespace shell {
// This class implements a blocking mode for web applications and is used in
// Chromecast internal code. Media is unblocked by default.
class CastMediaBlocker : public content::WebContentsObserver {
public:
explicit CastMediaBlocker(content::WebContents* web_contents);
// Constructor for test. |suspend_cb| and |resume_cb| will be called when
// Suspend() and Resume() are called.
CastMediaBlocker(content::WebContents* web_contents,
const base::Closure& suspend_cb,
const base::Closure& resume_cb);
~CastMediaBlocker() override;
// Sets if the web contents is allowed to play media or not. If media is
// unblocked, previously suspended elements should begin playing again.
void BlockMediaLoading(bool blocked);
// content::WebContentsObserver implementation:
void MediaSessionStateChanged(bool is_controllable,
bool is_suspended) override;
protected:
bool media_loading_blocked() const { return blocked_; }
// Blocks or unblocks the render process from loading new media
// according to |media_loading_blocked_|.
virtual void UpdateMediaBlockedState() {}
private:
// Suspends or resumes the media session for the web contents.
void Suspend();
void Resume();
base::Closure suspend_cb_;
base::Closure resume_cb_;
// Whether or not media should be blocked. This value cache's the last call to
// BlockMediaLoading. Is false by default.
bool blocked_;
// Whether or not the user paused media on the page.
bool paused_by_user_;
// Whether or not media in the app can be controlled and if media is currently
// suspended. These variables cache arguments from MediaSessionStateChanged().
bool suspended_;
bool controllable_;
DISALLOW_COPY_AND_ASSIGN(CastMediaBlocker);
};
} // namespace shell
} // namespace chromecast
#endif // CHROMECAST_BROWSER_CAST_MEDIA_BLOCKER_H_