full_screen_window_detector.h

Enable keyboard shortcuts

/*

 *  Copyright (c) 2014 The WebRTC project authors. All Rights Reserved.

 *  Use of this source code is governed by a BSD-style license

 *  that can be found in the LICENSE file in the root of the source

 *  tree. An additional intellectual property rights grant can be found

 *  in the file PATENTS.  All contributing project authors may

 *  be found in the AUTHORS file in the root of the source tree.

*/

#ifndef MODULES_DESKTOP_CAPTURE_FULL_SCREEN_WINDOW_DETECTOR_H_

#define MODULES_DESKTOP_CAPTURE_FULL_SCREEN_WINDOW_DETECTOR_H_

#include <memory>

#include "api/function_view.h"

#include "api/ref_counted_base.h"

#include "api/scoped_refptr.h"

#include "modules/desktop_capture/desktop_capturer.h"

#include "modules/desktop_capture/full_screen_application_handler.h"

namespace webrtc {

// This is a way to handle switch to full-screen mode for application in some

// specific cases:

// - Chrome on MacOS creates a new window in full-screen mode to

//   show a tab full-screen and minimizes the old window.

// - PowerPoint creates new windows in full-screen mode when user goes to

//   presentation mode (Slide Show Window, Presentation Window).

//

// To continue capturing in these cases, we try to find the new full-screen

// window using criteria provided by application specific

// FullScreenApplicationHandler.

class FullScreenWindowDetector

    : public rtc::RefCountedNonVirtual<FullScreenWindowDetector> {

 public:

  using ApplicationHandlerFactory =

      std::function<std::unique_ptr<FullScreenApplicationHandler>(

          DesktopCapturer::SourceId sourceId)>;

  FullScreenWindowDetector(

      ApplicationHandlerFactory application_handler_factory);

  FullScreenWindowDetector(const FullScreenWindowDetector&) = delete;

  FullScreenWindowDetector& operator=(const FullScreenWindowDetector&) = delete;

  // Returns the full-screen window in place of the original window if all the

  // criteria provided by FullScreenApplicationHandler are met, or 0 if no such

  // window found.

  DesktopCapturer::SourceId FindFullScreenWindow(

      DesktopCapturer::SourceId original_source_id);

  // The caller should call this function periodically, implementation will

  // update internal state no often than twice per second

  void UpdateWindowListIfNeeded(

      DesktopCapturer::SourceId original_source_id,

      rtc::FunctionView<bool(DesktopCapturer::SourceList*)> get_sources);

  static rtc::scoped_refptr<FullScreenWindowDetector>

  CreateFullScreenWindowDetector();

 protected:

  std::unique_ptr<FullScreenApplicationHandler> app_handler_;

 private:

  void CreateApplicationHandlerIfNeeded(DesktopCapturer::SourceId source_id);

  ApplicationHandlerFactory application_handler_factory_;

  int64_t last_update_time_ms_;

  DesktopCapturer::SourceId previous_source_id_;

  // Save the source id when we fail to create an instance of

  // CreateApplicationHandlerIfNeeded to avoid redundant attempt to do it again.

  DesktopCapturer::SourceId no_handler_source_id_;

  DesktopCapturer::SourceList window_list_;

};

}  // namespace webrtc

#endif  // MODULES_DESKTOP_CAPTURE_FULL_SCREEN_WINDOW_DETECTOR_H_