electron/atom/browser/api/atom_api_system_preferences_mac.mm

// Copyright (c) 2016 GitHub, Inc.
// Use of this source code is governed by the MIT license that can be
// found in the LICENSE file.

#include "atom/browser/api/atom_api_system_preferences.h"

#include <map>

#import <Cocoa/Cocoa.h>

#include "base/strings/sys_string_conversions.h"

namespace atom {

namespace api {

namespace {

int g_next_id = 0;

// The map to convert |id| to |int|.
std::map<int, id> g_id_map;

}  // namespace

int SystemPreferences::SubscribeNotification(const std::string& name,
                                             const base::Closure& callback) {
  int request_id = g_next_id++;
  __block base::Closure copied_callback = callback;
  g_id_map[request_id] = [[NSDistributedNotificationCenter defaultCenter]
      addObserverForName:base::SysUTF8ToNSString(name)
      object:nil
      queue:nil
      usingBlock:^(NSNotification* notification) {
        copied_callback.Run();
      }
  ];
  return request_id;
}

void SystemPreferences::UnsubscribeNotification(int request_id) {
  auto iter = g_id_map.find(request_id);
  if (iter != g_id_map.end()) {
    id observer = iter->second;
    [[NSDistributedNotificationCenter defaultCenter] removeObserver:observer];
    g_id_map.erase(iter);
  }
}

bool SystemPreferences::IsDarkMode() {
  NSString* mode = [[NSUserDefaults standardUserDefaults]
      stringForKey:@"AppleInterfaceStyle"];
  return [mode isEqualToString:@"Dark"];
}

}  // namespace api

}  // namespace atom