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

   1 //
   2 // System.Web.UI.WebControls.CheckBoxList.cs
   3 //
   4 // Authors:
   5 //   Gaurav Vaish (gvaish@iitk.ac.in)
   6 //   Andreas Nahr (ClassDevelopment@A-SoftTech.com)
   7 //
   8 // (C) Gaurav Vaish (2002)
   9 // (C) 2003 Andreas Nahr
  10 //
  11 \r
  12 using System;\r
  13 using System.Collections.Specialized;\r
  14 using System.ComponentModel;\r
  15 using System.Globalization;\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 CheckBoxList: ListControl, IRepeatInfoUser, INamingContainer, IPostBackDataHandler\r
  22         {\r
  23                 CheckBox checkBoxRepeater;\r
  24                 bool     isChangeNotified;\r
  25 \r
  26                 public CheckBoxList()\r
  27                 {\r
  28                         checkBoxRepeater = new CheckBox();\r
  29                         checkBoxRepeater.ID = "0";\r
  30                         checkBoxRepeater.EnableViewState = false;\r
  31                         Controls.Add (checkBoxRepeater);\r
  32                         isChangeNotified = false;\r
  33                 }\r
  34
  35                 [DefaultValue (-1), Bindable (true), WebCategory ("Layout")]
  36                 [WebSysDescription ("The border left within a CheckBox.")]\r
  37                 public virtual int CellPadding\r
  38                 {\r
  39                         get\r
  40                         {\r
  41                                 return (ControlStyleCreated ? ((TableStyle)ControlStyle).CellPadding : -1);\r
  42                         }\r
  43                         set\r
  44                         {\r
  45                                 ((TableStyle)ControlStyle).CellPadding = value;\r
  46                         }\r
  47                 }\r
  48
  49                 [DefaultValue (-1), Bindable (true), WebCategory ("Layout")]
  50                 [WebSysDescription ("The border left between CheckBoxes.")]\r
  51                 public virtual int CellSpacing\r
  52                 {\r
  53                         get\r
  54                         {\r
  55                                 return (ControlStyleCreated ? ((TableStyle)ControlStyle).CellSpacing : -1);\r
  56                         }\r
  57                         set\r
  58                         {\r
  59                                 ((TableStyle)ControlStyle).CellSpacing = value;\r
  60                         }\r
  61                 }\r
  62
  63                 [DefaultValue (0), Bindable (true), WebCategory ("Layout")]
  64                 [WebSysDescription ("The number of columns that should be used to display the CheckBoxes.")]\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
  82                 [DefaultValue (typeof (RepeatDirection), "Vertical"), Bindable (true), WebCategory ("Layout")]
  83                 [WebSysDescription ("The direction that is followed when doing the layout.")]\r
  84                 public virtual RepeatDirection RepeatDirection\r
  85                 {\r
  86                         get\r
  87                         {\r
  88                                 object o = ViewState["RepeatDirection"];\r
  89                                 if(o!=null)\r
  90                                         return (RepeatDirection)o;\r
  91                                 return RepeatDirection.Vertical;\r
  92                         }\r
  93                         set\r
  94                         {\r
  95                                 if(!System.Enum.IsDefined(typeof(RepeatDirection),value))\r
  96                                         throw new ArgumentException();\r
  97                                 ViewState["RepeatDirection"] = value;\r
  98                         }\r
  99                 }\r
 100
 101                 [DefaultValue (typeof (RepeatLayout), "Table"), Bindable (true), WebCategory ("Layout")]
 102                 [WebSysDescription ("The method used to create the layout.")]\r
 103                 public virtual RepeatLayout RepeatLayout\r
 104                 {\r
 105                         get\r
 106                         {\r
 107                                 object o = ViewState["RepeatLayout"];\r
 108                                 if(o!=null)\r
 109                                         return (RepeatLayout)o;\r
 110                                 return RepeatLayout.Table;\r
 111                         }\r
 112                         set\r
 113                         {\r
 114                                 if(!System.Enum.IsDefined(typeof(RepeatLayout), value))\r
 115                                         throw new ArgumentException();\r
 116                                 ViewState["RepeatLayout"] = value;\r
 117                         }\r
 118                 }\r
 119
 120                 [DefaultValue (typeof (TextAlign), "Right"), Bindable (true), WebCategory ("Appearance")]
 121                 [WebSysDescription ("The alignment of the CheckBox text.")]\r
 122                 public virtual TextAlign TextAlign\r
 123                 {\r
 124                         get\r
 125                         {\r
 126                                 object o = ViewState["TextAlign"];\r
 127                                 if(o!=null)\r
 128                                         return (TextAlign)o;\r
 129                                 return TextAlign.Right;\r
 130                         }\r
 131                         set\r
 132                         {\r
 133                                 if(!Enum.IsDefined(typeof(TextAlign), value))\r
 134                                         throw new ArgumentException();\r
 135                                 ViewState["TextAlign"] = value;\r
 136                         }\r
 137                 }\r
 138 \r
 139                 protected override Style CreateControlStyle()\r
 140                 {\r
 141                         return new TableStyle(ViewState);\r
 142                 }\r
 143 \r
 144                 protected override Control FindControl(string id, int pathOffset)\r
 145                 {\r
 146                         return this;\r
 147                 }\r
 148 \r
 149                 protected override void OnPreRender(EventArgs e)\r
 150                 {\r
 151                         checkBoxRepeater.AutoPostBack = AutoPostBack;\r
 152                         if(Page!=null)\r
 153                         {\r
 154                                 for(int i=0; i < Items.Count; i++)\r
 155                                 {\r
 156                                         if(Items[i].Selected)\r
 157                                         {\r
 158                                                 checkBoxRepeater.ID = i.ToString(NumberFormatInfo.InvariantInfo);\r
 159                                                 Page.RegisterRequiresPostBack(checkBoxRepeater);\r
 160                                         }\r
 161                                 }\r
 162                         }\r
 163                 }\r
 164 \r
 165                 protected override void Render(HtmlTextWriter writer)\r
 166                 {\r
 167                         RepeatInfo ri = new RepeatInfo();\r
 168                         checkBoxRepeater.TabIndex = TabIndex;\r
 169                         bool dirtyFlag = false;\r
 170                         short  tTabIndex = TabIndex;\r
 171                         Style s = (ControlStyleCreated ? ControlStyle : null);\r
 172                         if(TabIndex != 0)\r
 173                         {\r
 174                                 if(!ViewState.IsItemDirty("TabIndex"))\r
 175                                         dirtyFlag = true;\r
 176                                 TabIndex = 0;\r
 177                         }\r
 178                         ri.RepeatColumns = RepeatColumns;\r
 179                         ri.RepeatLayout  = RepeatLayout;\r
 180                         ri.RepeatDirection = RepeatDirection;\r
 181                         ri.RenderRepeater(writer, this, s, this);\r
 182                         if(tTabIndex != 0)\r
 183                         {\r
 184                                 TabIndex = tTabIndex;\r
 185                         }\r
 186                         if(dirtyFlag)\r
 187                         {\r
 188                                 ViewState.SetItemDirty("TabIndex", false);\r
 189                         }\r
 190                 }\r
 191
 192                 bool IPostBackDataHandler.LoadPostData(string postDataKey, NameValueCollection postCollection)
 193                 {
 194                         if (!Enabled)
 195                                 return false;
 196
 197                         int index = Int32.Parse(postDataKey.Substring(UniqueID.Length + 1));\r
 198                         if(index >= 0 && index < Items.Count)
 199                         {
 200                                 string v = postCollection [postDataKey];
 201                                 bool exists = (v != null);
 202                                 if(Items[index].Selected != exists)\r
 203                                 {\r
 204                                         Items[index].Selected = exists;\r
 205                                         if(!isChangeNotified)\r
 206                                         {\r
 207                                                 isChangeNotified = true;\r
 208                                                 return true;\r
 209                                         }\r
 210                                 }\r
 211                         }\r
 212                         return false;\r
 213                 }\r
 214 \r
 215                 void IPostBackDataHandler.RaisePostDataChangedEvent()\r
 216                 {\r
 217                         OnSelectedIndexChanged(EventArgs.Empty);\r
 218                 }\r
 219 \r
 220                 bool IRepeatInfoUser.HasFooter\r
 221                 {\r
 222                         get\r
 223                         {\r
 224                                 return false;\r
 225                         }\r
 226                 }\r
 227 \r
 228                 bool IRepeatInfoUser.HasHeader\r
 229                 {\r
 230                         get\r
 231                         {\r
 232                                 return false;\r
 233                         }\r
 234                 }\r
 235 \r
 236                 bool IRepeatInfoUser.HasSeparators\r
 237                 {\r
 238                         get\r
 239                         {\r
 240                                 return false;\r
 241                         }\r
 242                 }\r
 243 \r
 244                 int IRepeatInfoUser.RepeatedItemCount\r
 245                 {\r
 246                         get\r
 247                         {\r
 248                                 return Items.Count;\r
 249                         }\r
 250                 }\r
 251 \r
 252                 Style IRepeatInfoUser.GetItemStyle(ListItemType itemType, int repeatIndex)\r
 253                 {\r
 254                         return null;\r
 255                 }\r
 256 \r
 257                 void IRepeatInfoUser.RenderItem(ListItemType itemType, int repeatIndex, RepeatInfo repeatInfo, HtmlTextWriter writer)\r
 258                 {\r
 259                         checkBoxRepeater.ID = repeatIndex.ToString(NumberFormatInfo.InvariantInfo);\r
 260                         checkBoxRepeater.Text = Items[repeatIndex].Text;\r
 261                         checkBoxRepeater.TextAlign = TextAlign;\r
 262                         checkBoxRepeater.Checked = Items[repeatIndex].Selected;\r
 263                         checkBoxRepeater.Enabled = Enabled;\r
 264                         checkBoxRepeater.RenderControl(writer);\r
 265                 }\r
 266         }\r
 267 }\r