src/Tizen.System.Information/RuntimeInfo/RuntimeInfoEventHandler.cs

   1 /*
   2 * Copyright (c) 2016 - 2017 Samsung Electronics Co., Ltd All Rights Reserved
   3 *
   4 * Licensed under the Apache License, Version 2.0 (the License);
   5 * you may not use this file except in compliance with the License.
   6 * You may obtain a copy of the License at
   7 *
   8 * http://www.apache.org/licenses/LICENSE-2.0
   9 *
  10 * Unless required by applicable law or agreed to in writing, software
  11 * distributed under the License is distributed on an AS IS BASIS,
  12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13 * See the License for the specific language governing permissions and
  14 * limitations under the License.
  15 */
  16
  17 using System;
  18
  19 namespace Tizen.System
  20 {
  21     internal class RuntimeInfoEventHandler
  22     {
  23         private RuntimeInfoKey Key;
  24         private event EventHandler<RuntimeFeatureStatusChangedEventArgs> Handler;
  25
  26         internal RuntimeInfoEventHandler(RuntimeInfoKey key)
  27         {
  28             Key = key;
  29             Handler = null;
  30         }
  31
  32         private static Interop.RuntimeInfo.RuntimeInformationChangedCallback __callback;
  33
  34         internal event EventHandler<RuntimeFeatureStatusChangedEventArgs> EventHandler
  35         {
  36             add
  37             {
  38                 if (Handler == null)
  39                 {
  40                     __callback = (RuntimeInfoKey num, IntPtr userData) =>
  41                     {
  42                         string strKey = "Invalid";
  43
  44                         if (num > 0 && Information.EnumStringMapping.ContainsKey(num))
  45                         {
  46                             strKey = Information.EnumStringMapping[num];
  47                         }
  48
  49                         RuntimeFeatureStatusChangedEventArgs eventArgs = new RuntimeFeatureStatusChangedEventArgs()
  50                         {
  51                             Key = Information.HttpPrefix + Information.RuntimeInfoStringKeyPrefix + strKey
  52                         };
  53
  54                         Handler?.Invoke(null, eventArgs);
  55                     };
  56
  57                     InformationError ret = Interop.RuntimeInfo.SetRuntimeInfoChangedCallback(Key, __callback, IntPtr.Zero);
  58                     if (ret != InformationError.None)
  59                     {
  60                         Log.Error(InformationErrorFactory.LogTag, "Interop failed to add event handler");
  61                         InformationErrorFactory.ThrowException(ret);
  62                     }
  63                 }
  64                 Handler += value;
  65             }
  66             remove
  67             {
  68                 Handler -= value;
  69                 if (Handler == null)
  70                 {
  71                     InformationError ret = Interop.RuntimeInfo.UnsetRuntimeInfoChangedCallback(Key);
  72                     if (ret != InformationError.None)
  73                     {
  74                         Log.Error(InformationErrorFactory.LogTag, "Interop failed to add event handler");
  75                         InformationErrorFactory.ThrowException(ret);
  76                     }
  77                 }
  78             }
  79         }
  80     }
  81 }