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         public bool IsEnabled
  35         {
  36             get { return !Interop.Elementary.elm_object_item_disabled_get(Handle); }
  37             set { Interop.Elementary.elm_object_item_disabled_set(Handle, !value); }
  38         }
  39
  40         internal IntPtr Handle
  41         {
  42             get
  43             {
  44                 return _handle;
  45             }
  46             set
  47             {
  48                 if (_handle == value)
  49                     return;
  50
  51                 if (_handle != IntPtr.Zero)
  52                 {
  53                     UnsetDeleteCallback();
  54                 }
  55                 _handle = value;
  56                 SetDeleteCallback();
  57                 s_HandleToItemTable[Handle] = this;
  58             }
  59         }
  60
  61         public event EventHandler Deleted;
  62
  63         public void Delete()
  64         {
  65             Interop.Elementary.elm_object_item_del(Handle);
  66             _handle = IntPtr.Zero;
  67         }
  68
  69         public void SetPartContent(string part, EvasObject content)
  70         {
  71             SetPartContent(part, content, false);
  72         }
  73
  74         public void SetPartContent(string part, EvasObject content, bool preserveOldContent)
  75         {
  76             if (preserveOldContent)
  77             {
  78                 Interop.Elementary.elm_object_item_part_content_unset(Handle, part);
  79             }
  80             Interop.Elementary.elm_object_item_part_content_set(Handle, part, content);
  81         }
  82
  83         public void SetPartText(string part, string text)
  84         {
  85             Interop.Elementary.elm_object_item_part_text_set(Handle, part, text);
  86         }
  87
  88         public string GetPartText(string part)
  89         {
  90             return Interop.Elementary.elm_object_item_part_text_get(Handle, part);
  91         }
  92
  93         public static implicit operator IntPtr(ItemObject obj)
  94         {
  95             if (obj == null)
  96                 return IntPtr.Zero;
  97             return obj.Handle;
  98         }
  99
 100         protected virtual void OnInvalidate() { }
 101
 102         internal static ItemObject GetItemById(int id)
 103         {
 104             ItemObject value;
 105             s_IdToItemTable.TryGetValue(id, out value);
 106             return value;
 107         }
 108
 109         internal static ItemObject GetItemByHandle(IntPtr handle)
 110         {
 111             ItemObject value;
 112             s_HandleToItemTable.TryGetValue(handle, out value);
 113             return value;
 114         }
 115
 116         void DeleteCallbackHandler(IntPtr data, IntPtr obj, IntPtr info)
 117         {
 118             Deleted?.Invoke(this, EventArgs.Empty);
 119             OnInvalidate();
 120             _handle = IntPtr.Zero;
 121         }
 122
 123         void UnsetDeleteCallback()
 124         {
 125             Interop.Elementary.elm_object_item_del_cb_set(Handle, null);
 126         }
 127
 128         void SetDeleteCallback()
 129         {
 130             if (Handle != IntPtr.Zero)
 131                 Interop.Elementary.elm_object_item_del_cb_set(Handle, _deleteCallback);
 132         }
 133
 134         static int GetNextId()
 135         {
 136             return s_globalId++;
 137         }
 138     }
 139 }