display_manager.h

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// Copyright 2013 The Flutter 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 FLUTTER_SHELL_COMMON_DISPLAY_MANAGER_H_
#define FLUTTER_SHELL_COMMON_DISPLAY_MANAGER_H_
 
#include <mutex>
#include <vector>
 
#include "flutter/shell/common/display.h"
 
namespace flutter {
 
/// Manages lifecycle of the connected displays. This class is thread-safe.
class DisplayManager {
 public:
  DisplayManager();
 
  ~DisplayManager();
 
  /// Returns the display refresh rate of the main display. In cases where there
  /// is only one display connected, it will return that. We do not yet support
  /// cases where there are multiple displays.
  ///
  /// When there are no registered displays, it returns
  /// `kUnknownDisplayRefreshRate`.
  double GetMainDisplayRefreshRate() const;
 
  /// Handles the display updates.
  void HandleDisplayUpdates(std::vector<std::unique_ptr<Display>> displays);
 
 private:
  /// Guards `displays_` vector.
  mutable std::mutex displays_mutex_;
  std::vector<std::unique_ptr<Display>> displays_;
};
 
}  // namespace flutter
 
#endif  // FLUTTER_SHELL_COMMON_DISPLAY_MANAGER_H_