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

   1 /**\r
   2 * Namespace: System.Web.UI.WebControls\r
   3 * Class:     CheckBoxList\r
   4 *\r
   5 * Author:  Gaurav Vaish\r
   6 * Maintainer: gvaish@iitk.ac.in\r
   7 * Contact: <gvaish@iitk.ac.in>\r
   8 * Implementation: yes\r
   9 * Status:  100%\r
  10 *\r
  11 * (C) Gaurav Vaish (2001)\r
  12 */\r
  13 \r
  14 using System;\r
  15 using System.Collections.Specialized;\r
  16 using System.ComponentModel;\r
  17 using System.Globalization;\r
  18 using System.Web;\r
  19 using System.Web.UI;\r
  20 \r
  21 namespace System.Web.UI.WebControls\r
  22 {\r
  23         [DefaultEvent("SelectedIndexChanged")]\r
  24         [DefaultProperty("DataSource")]\r
  25         [ParseChildren(true, "Items")]\r
  26         [PersistChildren(false)]\r
  27         public class CheckBoxList: ListControl, IRepeatInfoUser, INamingContainer, IPostBackDataHandler\r
  28         {\r
  29                 CheckBox checkBoxRepeater;\r
  30                 bool     isChangeNotified;\r
  31 \r
  32                 public CheckBoxList()\r
  33                 {\r
  34                         checkBoxRepeater = new CheckBox();\r
  35                         checkBoxRepeater.ID = "0";\r
  36                         checkBoxRepeater.EnableViewState = false;\r
  37                         checkBoxRepeater.Controls.Add(this);\r
  38                         isChangeNotified = false;\r
  39                 }\r
  40 \r
  41                 public virtual int CellPadding\r
  42                 {\r
  43                         get\r
  44                         {\r
  45                                 return (ControlStyleCreated ? ((TableStyle)ControlStyle).CellPadding : -1);\r
  46                         }\r
  47                         set\r
  48                         {\r
  49                                 ((TableStyle)ControlStyle).CellPadding = value;\r
  50                         }\r
  51                 }\r
  52 \r
  53                 public virtual int CellSpacing\r
  54                 {\r
  55                         get\r
  56                         {\r
  57                                 return (ControlStyleCreated ? ((TableStyle)ControlStyle).CellSpacing : -1);\r
  58                         }\r
  59                         set\r
  60                         {\r
  61                                 ((TableStyle)ControlStyle).CellSpacing = value;\r
  62                         }\r
  63                 }\r
  64 \r
  65                 public virtual int RepeatColumns\r
  66                 {\r
  67                         get\r
  68                         {\r
  69                                 object o = ViewState["RepeatColumns"];\r
  70                                 if(o!=null)\r
  71                                         return (int)o;\r
  72                                 return 0;\r
  73                         }\r
  74                         set\r
  75                         {\r
  76                                 if(value < 0)\r
  77                                         throw new ArgumentOutOfRangeException();\r
  78                                 ViewState["RepeatColumns"] = value;\r
  79                         }\r
  80                 }\r
  81 \r
  82                 public virtual RepeatDirection RepeatDirection\r
  83                 {\r
  84                         get\r
  85                         {\r
  86                                 object o = ViewState["RepeatDirection"];\r
  87                                 if(o!=null)\r
  88                                         return (RepeatDirection)o;\r
  89                                 return RepeatDirection.Vertical;\r
  90                         }\r
  91                         set\r
  92                         {\r
  93                                 if(!System.Enum.IsDefined(typeof(RepeatDirection),value))\r
  94                                         throw new ArgumentException();\r
  95                                 ViewState["RepeatDirection"] = value;\r
  96                         }\r
  97                 }\r
  98 \r
  99                 public virtual RepeatLayout RepeatLayout\r
 100                 {\r
 101                         get\r
 102                         {\r
 103                                 object o = ViewState["RepeatLayout"];\r
 104                                 if(o!=null)\r
 105                                         return (RepeatLayout)o;\r
 106                                 return RepeatLayout.Table;\r
 107                         }\r
 108                         set\r
 109                         {\r
 110                                 if(!System.Enum.IsDefined(typeof(RepeatLayout), value))\r
 111                                         throw new ArgumentException();\r
 112                                 ViewState["RepeatLayout"] = value;\r
 113                         }\r
 114                 }\r
 115 \r
 116                 public virtual TextAlign TextAlign\r
 117                 {\r
 118                         get\r
 119                         {\r
 120                                 object o = ViewState["TextAlign"];\r
 121                                 if(o!=null)\r
 122                                         return (TextAlign)o;\r
 123                                 return TextAlign.Right;\r
 124                         }\r
 125                         set\r
 126                         {\r
 127                                 if(!Enum.IsDefined(typeof(TextAlign), value))\r
 128                                         throw new ArgumentException();\r
 129                                 ViewState["TextAlign"] = value;\r
 130                         }\r
 131                 }\r
 132 \r
 133                 protected override Style CreateControlStyle()\r
 134                 {\r
 135                         return new TableStyle(ViewState);\r
 136                 }\r
 137 \r
 138                 protected override Control FindControl(string id, int pathOffset)\r
 139                 {\r
 140                         return this;\r
 141                 }\r
 142 \r
 143                 protected override void OnPreRender(EventArgs e)\r
 144                 {\r
 145                         checkBoxRepeater.AutoPostBack = AutoPostBack;\r
 146                         if(Page!=null)\r
 147                         {\r
 148                                 for(int i=0; i < Items.Count; i++)\r
 149                                 {\r
 150                                         if(Items[i].Selected)\r
 151                                         {\r
 152                                                 checkBoxRepeater.ID = i.ToString(NumberFormatInfo.InvariantInfo);\r
 153                                                 Page.RegisterRequiresPostBack(checkBoxRepeater);\r
 154                                         }\r
 155                                 }\r
 156                         }\r
 157                 }\r
 158 \r
 159                 protected override void Render(HtmlTextWriter writer)\r
 160                 {\r
 161                         RepeatInfo ri = new RepeatInfo();\r
 162                         checkBoxRepeater.TabIndex = TabIndex;\r
 163                         bool dirtyFlag = false;\r
 164                         short  tTabIndex = TabIndex;\r
 165                         Style s = (ControlStyleCreated ? ControlStyle : null);\r
 166                         if(TabIndex > 0)\r
 167                         {\r
 168                                 if(!ViewState.IsItemDirty("TabIndex"))\r
 169                                         dirtyFlag = true;\r
 170                                 TabIndex = 0;\r
 171                         }\r
 172                         ri.RepeatColumns = RepeatColumns;\r
 173                         ri.RepeatLayout  = RepeatLayout;\r
 174                         ri.RepeatDirection = RepeatDirection;\r
 175                         ri.RenderRepeater(writer, this, s, this);\r
 176                         if(tTabIndex > 0)\r
 177                         {\r
 178                                 TabIndex = tTabIndex;\r
 179                         }\r
 180                         if(dirtyFlag)\r
 181                         {\r
 182                                 ViewState.SetItemDirty("TabIndex", false);\r
 183                         }\r
 184                 }\r
 185 \r
 186                 bool IPostBackDataHandler.LoadPostData(string postDataKey, NameValueCollection postCollection)\r
 187                 {\r
 188                         int index = Int32.Parse(postDataKey.Substring(UniqueID.Length + 1));\r
 189                         if(index >= 0 && index < Items.Count)\r
 190                         {\r
 191                                 bool exists = (postCollection[postDataKey]!=null);\r
 192                                 if(Items[index].Selected != exists)\r
 193                                 {\r
 194                                         Items[index].Selected = exists;\r
 195                                         if(!isChangeNotified)\r
 196                                         {\r
 197                                                 isChangeNotified = true;\r
 198                                                 return true;\r
 199                                         }\r
 200                                 }\r
 201                         }\r
 202                         return false;\r
 203                 }\r
 204 \r
 205                 void IPostBackDataHandler.RaisePostDataChangedEvent()\r
 206                 {\r
 207                         OnSelectedIndexChanged(EventArgs.Empty);\r
 208                 }\r
 209 \r
 210                 bool IRepeatInfoUser.HasFooter\r
 211                 {\r
 212                         get\r
 213                         {\r
 214                                 return false;\r
 215                         }\r
 216                 }\r
 217 \r
 218                 bool IRepeatInfoUser.HasHeader\r
 219                 {\r
 220                         get\r
 221                         {\r
 222                                 return false;\r
 223                         }\r
 224                 }\r
 225 \r
 226                 bool IRepeatInfoUser.HasSeparators\r
 227                 {\r
 228                         get\r
 229                         {\r
 230                                 return false;\r
 231                         }\r
 232                 }\r
 233 \r
 234                 int IRepeatInfoUser.RepeatedItemCount\r
 235                 {\r
 236                         get\r
 237                         {\r
 238                                 return Items.Count;\r
 239                         }\r
 240                 }\r
 241 \r
 242                 Style IRepeatInfoUser.GetItemStyle(ListItemType itemType, int repeatIndex)\r
 243                 {\r
 244                         return null;\r
 245                 }\r
 246 \r
 247                 void IRepeatInfoUser.RenderItem(ListItemType itemType, int repeatIndex, RepeatInfo repeatInfo, HtmlTextWriter writer)\r
 248                 {\r
 249                         checkBoxRepeater.ID = repeatIndex.ToString(NumberFormatInfo.InvariantInfo);\r
 250                         checkBoxRepeater.Text = Items[repeatIndex].Text;\r
 251                         checkBoxRepeater.TextAlign = TextAlign;\r
 252                         checkBoxRepeater.Checked = Items[repeatIndex].Selected;\r
 253                         checkBoxRepeater.RenderControl(writer);\r
 254                 }\r
 255         }\r
 256 }\r