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// Copyright 2020 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef COMPONENTS_MEDIA_CONTROL_BROWSER_MEDIA_BLOCKER_H_
#define COMPONENTS_MEDIA_CONTROL_BROWSER_MEDIA_BLOCKER_H_
#include "content/public/browser/web_contents_observer.h"
namespace media_control {
// This class implements a blocking mode for web applications. Media is
// unblocked by default.
// This is currently used in Chromecast internal code.
// TODO(crbug.com/40120884): Add comment about Fuchsia with implementation.
class MediaBlocker : public content::WebContentsObserver {
public:
// Observes WebContents.
explicit MediaBlocker(content::WebContents* web_contents);
~MediaBlocker() override;
MediaBlocker(const MediaBlocker&) = delete;
MediaBlocker& operator=(const MediaBlocker&) = delete;
// Sets if the web contents is allowed to load and play media or not.
// If media is unblocked, previously suspended elements should begin playing
// again.
void BlockMediaLoading(bool blocked);
bool media_loading_blocked() const { return media_loading_blocked_; }
private:
// content::WebContentsObserver implementation:
void RenderFrameCreated(content::RenderFrameHost* render_frame_host) final;
void RenderViewReady() final;
// Blocks or unblocks the render process from loading new media
// according to |media_loading_blocked_|.
void UpdateMediaLoadingBlockedState();
void UpdateRenderFrameMediaLoadingBlockedState(
content::RenderFrameHost* render_frame_host);
// Subclasses can override this function if additional handling for
// BlockMediaLoading is needed when the blocked state changes.
virtual void OnBlockMediaLoadingChanged() {}
// Subclasses can override this function if additional handling for
// RenderFrameCreated is needed.
virtual void OnRenderFrameCreated(
content::RenderFrameHost* render_frame_host) {}
// Whether or not media loading should be blocked. This value cache's the last
// call to BlockMediaLoading. Is false by default.
bool media_loading_blocked_ = false;
};
} // namespace media_control
#endif // COMPONENTS_MEDIA_CONTROL_BROWSER_MEDIA_BLOCKER_H_
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