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_PLATFORM_WINDOWS_DISPLAY_MANAGER_H_
#define FLUTTER_SHELL_PLATFORM_WINDOWS_DISPLAY_MANAGER_H_
 
#include <windows.h>
#include <memory>
#include <vector>
 
#include "flutter/shell/platform/embedder/embedder.h"
#include "flutter/shell/platform/windows/windows_proc_table.h"
 
namespace flutter {
 
class FlutterWindowsEngine;
class DisplayManagerWin32 {
 public:
  explicit DisplayManagerWin32(FlutterWindowsEngine* engine);
  ~DisplayManagerWin32();
 
  // Updates the display information and notifies the engine
  void UpdateDisplays();
 
  // Handles Windows messages related to display changes
  // Returns true if the message was handled and should not be further processed
  bool HandleWindowMessage(HWND hwnd,
                           UINT message,
                           WPARAM wparam,
                           LPARAM lparam,
                           LRESULT* result);
 
  // Finds the display information associated with the id.
  std::optional<FlutterEngineDisplay> FindById(FlutterEngineDisplayId id);
 
  // Get the display information for all displays
  std::vector<FlutterEngineDisplay> GetDisplays() const;
 
 private:
  // Called by EnumDisplayMonitors once for each display.
  static BOOL CALLBACK EnumMonitorCallback(HMONITOR monitor,
                                           HDC hdc,
                                           LPRECT rect,
                                           LPARAM data);
 
  // Helper method that creates a |FlutterEngineDisplay| from the
  // provided |monitor|.
  std::optional<FlutterEngineDisplay> FromMonitor(HMONITOR monitor) const;
 
  FlutterWindowsEngine* engine_;
 
  std::shared_ptr<WindowsProcTable> win32_;
};
}  // namespace flutter
#endif  // FLUTTER_SHELL_PLATFORM_WINDOWS_DISPLAY_MANAGER_H_