mcs/class/System.Web/System.Web.UI.WebControls/ListControl.cs

   1 /**\r
   2 * Namespace: System.Web.UI.WebControls\r
   3 * Class:     ListControl\r
   4 *\r
   5 * Author:  Gaurav Vaish\r
   6 * Maintainer: gvaish@iitk.ac.in\r
   7 * Contact: <my_scripts2001@yahoo.com>, <gvaish@iitk.ac.in>\r
   8 * Status:  10%\r
   9 *\r
  10 * (C) Gaurav Vaish (2001)\r
  11 */\r
  12 \r
  13 using System;\r
  14 using System.Collections;\r
  15 using System.ComponentModel;\r
  16 using System.Web;\r
  17 using System.Web.UI;\r
  18 \r
  19 namespace System.Web.UI.WebControls\r
  20 {\r
  21         public class ListControl: WebControl\r
  22         {\r
  23                 private static readonly object SelectedIndexChangedEvent = new object();\r
  24 \r
  25                 private object dataSource;\r
  26                 private ListItemCollection items;\r
  27                 \r
  28                 public ListControl(): base(HtmlTextWriterTag.Select)\r
  29                 {\r
  30                 }\r
  31                 \r
  32                 public event EventHandler SelectedIndexChanged\r
  33                 {\r
  34                         add\r
  35                         {\r
  36                                 Events.AddHandler(SelectedIndexChangedEvent, value);\r
  37                         }\r
  38                         remove\r
  39                         {\r
  40                                 Events.RemoveHandler(SelectedIndexChangedEvent, value);\r
  41                         }\r
  42                 }\r
  43                 \r
  44                 protected virtual void OnSelectedIndexChanged(EventArgs e)\r
  45                 {\r
  46                         if(Events!=null)\r
  47                                 {\r
  48                                         EventHandler eh = (EventHandler)(Events[SelectedIndexChangedEvent]);\r
  49                                         if(eh!=null)\r
  50                                                 eh(this, e);\r
  51                                 }\r
  52                 }\r
  53                 \r
  54                 public virtual bool AutoPostBack\r
  55                 {\r
  56                         get\r
  57                         {\r
  58                                 object o = ViewState["AutoPostBack"];\r
  59                                 if(o!=null)\r
  60                                         return (bool)o;\r
  61                                 return false;\r
  62                         }\r
  63                         set\r
  64                         {\r
  65                                 ViewState["AutoPostBack"] = value;\r
  66                         }\r
  67                 }\r
  68                 \r
  69                 public virtual string DataMember\r
  70                 {\r
  71                         get\r
  72                         {\r
  73                                 object o = ViewState["DataMember"];\r
  74                                 if(o!=null)\r
  75                                         return (string)o;\r
  76                                 return String.Empty;\r
  77                         }\r
  78                         set\r
  79                         {\r
  80                                 ViewState["DataMember"] = value;\r
  81                         }\r
  82                 }\r
  83                 \r
  84                 public virtual object DataSource\r
  85                 {\r
  86                         get\r
  87                         {\r
  88                                 return dataSource;\r
  89                         }\r
  90                         set\r
  91                         {\r
  92                                 if(value != null)\r
  93                                 {\r
  94                                         if(value is IListSource || value is IEnumerable)\r
  95                                         {\r
  96                                                 dataSource = value;\r
  97                                                 return;\r
  98                                         }\r
  99                                 }\r
 100                                 throw new ArgumentException(/*HttpRuntime.FormatResourceString(ID, "Invalid DataSource Type")*/);\r
 101                         }\r
 102                 }\r
 103                 \r
 104                 public virtual string DataTextField\r
 105                 {\r
 106                         get\r
 107                         {\r
 108                                 object o = ViewState["DataTextField"];\r
 109                                 if(o!=null)\r
 110                                         return (string)o;\r
 111                                 return String.Empty;\r
 112                         }\r
 113                         set\r
 114                         {\r
 115                                 ViewState["DataTextField"] = value;\r
 116                         }\r
 117                 }\r
 118                 \r
 119                 public virtual string DataTextFormatString\r
 120                 {\r
 121                         get\r
 122                         {\r
 123                                 object o = ViewState["DataTextFormatString"];\r
 124                                 if(o!=null)\r
 125                                         return (string)o;\r
 126                                 return String.Empty;\r
 127                         }\r
 128                         set\r
 129                         {\r
 130                                 ViewState["DataTextFormatString"] = value;\r
 131                         }\r
 132                 }\r
 133                 \r
 134                 public virtual string DataValueField\r
 135                 {\r
 136                         get\r
 137                         {\r
 138                                 object o = ViewState["DataValueField"];\r
 139                                 if(o!=null)\r
 140                                         return (string)o;\r
 141                                 return String.Empty;\r
 142                         }\r
 143                         set\r
 144                         {\r
 145                                 ViewState["DataValueField"] = value;\r
 146                         }\r
 147                 }\r
 148                 \r
 149                 public virtual ListItemCollection Items\r
 150                 {\r
 151                         get\r
 152                         {\r
 153                                 if(items==null)\r
 154                                 {\r
 155                                         items = new ListItemCollection();\r
 156                                         if(IsTrackingViewState)\r
 157                                         {\r
 158                                                 //items.TrackViewState();\r
 159                                         }\r
 160                                 }\r
 161                                 return items;\r
 162                         }\r
 163                 }\r
 164                 \r
 165                 public virtual int SelectedIndex\r
 166                 {\r
 167                         get\r
 168                         {\r
 169                                 object o = ViewState["SelectedIndex"];\r
 170                                 if(o!=null)\r
 171                                         return (int)o;\r
 172                                 return -1;\r
 173                         }\r
 174                         set\r
 175                         {\r
 176                                 ViewState["SelectedIndex"] = value;\r
 177                         }\r
 178                 }\r
 179                 \r
 180                 public virtual ListItem SelectedItem\r
 181                 {\r
 182                         get\r
 183                         {\r
 184                                 if(SelectedIndex > 0)\r
 185                                 {\r
 186                                         return Items[SelectedIndex];\r
 187                                 }\r
 188                                 return null;\r
 189                         }\r
 190                 }\r
 191                 \r
 192                 internal virtual ArrayList SelectedIndexes\r
 193                 {\r
 194                         get\r
 195                         {\r
 196                                 ArrayList retVal = new ArrayList();\r
 197                                 int index = 0;\r
 198                                 while(index < Items.Count)\r
 199                                 {\r
 200                                         retVal.Add(Items[index++]);\r
 201                                 }\r
 202                                 return retVal;\r
 203                         }\r
 204                 }\r
 205                 \r
 206                 internal void Select(ArrayList whatToSelect)\r
 207                 {\r
 208                         ClearSelection();\r
 209                         int i = 0;\r
 210                         while(i < whatToSelect.Count)\r
 211                         {\r
 212                                 int index = (int)whatToSelect[i++];                             \r
 213                                 if(index > 0)\r
 214                                 {\r
 215                                         Items[index].Selected = true;\r
 216                                 }\r
 217                         }\r
 218                 }\r
 219                 \r
 220                 public virtual void ClearSelection()\r
 221                 {\r
 222                         //TODO: Found it - an undocumented method\r
 223                 }\r
 224                 \r
 225                 protected override void LoadViewState(object savedState)\r
 226                 {\r
 227                         //TODO: Implement me\r
 228                         throw new NotImplementedException();\r
 229                 }\r
 230         }\r
 231 }\r