src/ElmSharp/ElmSharp/ItemObject.cs

   1 using System;
   2 using System.Collections.Generic;
   3 using System.Linq;
   4 using System.Text;
   5 using System.Threading.Tasks;
   6
   7 namespace ElmSharp
   8 {
   9     public class ItemObject
  10     {
  11         private static Dictionary<int, ItemObject> s_IdToItemTable = new Dictionary<int, ItemObject>();
  12         private static Dictionary<IntPtr, ItemObject> s_HandleToItemTable = new Dictionary<IntPtr, ItemObject>();
  13         private static int s_globalId = 0;
  14
  15         Interop.Evas.SmartCallback _deleteCallback;
  16         IntPtr _handle = IntPtr.Zero;
  17
  18         protected ItemObject(IntPtr handle)
  19         {
  20             _deleteCallback = DeleteCallbackHandler;
  21             Id = GetNextId();
  22             s_IdToItemTable[Id] = this;
  23             Handle = handle;
  24         }
  25
  26         ~ItemObject()
  27         {
  28             if (Handle != IntPtr.Zero)
  29                 Interop.Elementary.elm_object_item_del(Handle);
  30         }
  31
  32         public int Id { get; private set; }
  33
  34         internal IntPtr Handle
  35         {
  36             get
  37             {
  38                 return _handle;
  39             }
  40             set
  41             {
  42                 if (_handle == value)
  43                     return;
  44
  45                 if (_handle != IntPtr.Zero)
  46                 {
  47                     UnsetDeleteCallback();
  48                 }
  49                 _handle = value;
  50                 SetDeleteCallback();
  51                 s_HandleToItemTable[Handle] = this;
  52             }
  53         }
  54
  55         internal event EventHandler Deleted;
  56
  57         public void Delete()
  58         {
  59             Interop.Elementary.elm_object_item_del(Handle);
  60             _handle = IntPtr.Zero;
  61         }
  62
  63         public void SetPartContent(string part, EvasObject content)
  64         {
  65             SetPartContent(part, content, false);
  66         }
  67
  68         public void SetPartContent(string part, EvasObject content, bool preserveOldContent)
  69         {
  70             if (preserveOldContent)
  71             {
  72                 Interop.Elementary.elm_object_item_part_content_unset(Handle, part);
  73             }
  74             Interop.Elementary.elm_object_item_part_content_set(Handle, part, content);
  75         }
  76
  77         public void SetPartText(string part, string text)
  78         {
  79             Interop.Elementary.elm_object_item_part_text_set(Handle, part, text);
  80         }
  81
  82         public string GetPartText(string part)
  83         {
  84             return Interop.Elementary.elm_object_item_part_text_get(Handle, part);
  85         }
  86
  87         public static implicit operator IntPtr(ItemObject obj)
  88         {
  89             if (obj == null)
  90                 return IntPtr.Zero;
  91             return obj.Handle;
  92         }
  93
  94         protected virtual void OnInvalidate() { }
  95
  96         internal static ItemObject GetItemById(int id)
  97         {
  98             ItemObject value;
  99             s_IdToItemTable.TryGetValue(id, out value);
 100             return value;
 101         }
 102
 103         internal static ItemObject GetItemByHandle(IntPtr handle)
 104         {
 105             ItemObject value;
 106             s_HandleToItemTable.TryGetValue(handle, out value);
 107             return value;
 108         }
 109
 110         void DeleteCallbackHandler(IntPtr data, IntPtr obj, IntPtr info)
 111         {
 112             Deleted?.Invoke(this, EventArgs.Empty);
 113             OnInvalidate();
 114             _handle = IntPtr.Zero;
 115         }
 116
 117         void UnsetDeleteCallback()
 118         {
 119             Interop.Elementary.elm_object_item_del_cb_set(Handle, null);
 120         }
 121
 122         void SetDeleteCallback()
 123         {
 124             if (Handle != IntPtr.Zero)
 125                 Interop.Elementary.elm_object_item_del_cb_set(Handle, _deleteCallback);
 126         }
 127
 128         static int GetNextId()
 129         {
 130             return s_globalId++;
 131         }
 132     }
 133 }