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

   1 /**\r
   2  * Namespace: System.Web.UI.WebControls\r
   3  * Class:     HyperLinkColumn\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  * Implementation: yes\r
   9  * Status:  5%\r
  10  *\r
  11  * (C) Gaurav Vaish (2002)\r
  12  */\r
  13 \r
  14 using System;\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 HyperLinkColumn: DataGridColumn\r
  22         {\r
  23                 PropertyDescriptor textFieldDescriptor;\r
  24                 PropertyDescriptor urlFieldDescriptor;\r
  25 \r
  26                 public HyperLinkColumn(): base()\r
  27                 {\r
  28                 }\r
  29 \r
  30                 public virtual string DataNavigateUrlField\r
  31                 {\r
  32                         get\r
  33                         {\r
  34                                 object o = ViewState["DataNavigateUrlField"];\r
  35                                 if(o != null)\r
  36                                         return (string)o;\r
  37                                 return String.Empty;\r
  38                         }\r
  39                         set\r
  40                         {\r
  41                                 ViewState["DataNavigateUrlField"] = value;\r
  42                         }\r
  43                 }\r
  44 \r
  45                 public virtual string DataNavigateUrlFormatString\r
  46                 {\r
  47                         get\r
  48                         {\r
  49                                 object o = ViewState["DataNavigateUrlFormatString"];\r
  50                                 if(o != null)\r
  51                                         return (string)o;\r
  52                                 return String.Empty;\r
  53                         }\r
  54                         set\r
  55                         {\r
  56                                 ViewState["DataNavigateUrlFormatString"] = value;\r
  57                         }\r
  58                 }\r
  59 \r
  60                 public virtual string DataTextField\r
  61                 {\r
  62                         get\r
  63                         {\r
  64                                 object o = ViewState["DataTextField"];\r
  65                                 if(o != null)\r
  66                                         return (string)o;\r
  67                                 return String.Empty;\r
  68                         }\r
  69                         set\r
  70                         {\r
  71                                 ViewState["DataTextField"] = value;\r
  72                         }\r
  73                 }\r
  74 \r
  75                 public virtual string DataTextFormatString\r
  76                 {\r
  77                         get\r
  78                         {\r
  79                                 object o = ViewState["DataTextFormatString"];\r
  80                                 if(o != null)\r
  81                                         return (string)o;\r
  82                                 return String.Empty;\r
  83                         }\r
  84                         set\r
  85                         {\r
  86                                 ViewState["DataTextFormatString"] = value;\r
  87                         }\r
  88                 }\r
  89 \r
  90                 public virtual string NavigateUrl\r
  91                 {\r
  92                         get\r
  93                         {\r
  94                                 object o = ViewState["NavigateUrl"];\r
  95                                 if(o != null)\r
  96                                         return (string)o;\r
  97                                 return String.Empty;\r
  98                         }\r
  99                         set\r
 100                         {\r
 101                                 ViewState["NavigateUrl"] = value;\r
 102                         }\r
 103                 }\r
 104 \r
 105                 public virtual string Target\r
 106                 {\r
 107                         get\r
 108                         {\r
 109                                 object o = ViewState["Target"];\r
 110                                 if(o != null)\r
 111                                         return (string)o;\r
 112                                 return String.Empty;\r
 113                         }\r
 114                         set\r
 115                         {\r
 116                                 ViewState["Target"] = value;\r
 117                         }\r
 118                 }\r
 119 \r
 120                 public virtual string Text\r
 121                 {\r
 122                         get\r
 123                         {\r
 124                                 object o = ViewState["Text"];\r
 125                                 if(o != null)\r
 126                                         return (string)o;\r
 127                                 return String.Empty;\r
 128                         }\r
 129                         set\r
 130                         {\r
 131                                 ViewState["Text"] = value;\r
 132                         }\r
 133                 }\r
 134 \r
 135                 public override void Initialize()\r
 136                 {\r
 137                         textFieldDescriptor = null;\r
 138                         urlFieldDescriptor  = null;\r
 139                 }\r
 140 \r
 141                 public override void InitializeCell(TableCell cell, int columnIndex, ListItemType itemType)\r
 142                 {\r
 143                         base.InitializeCell(cell, columnIndex, itemType);\r
 144                         if(Enum.IsDefined(typeof(ListItemType), itemType) && itemType != ListItemType.Footer)\r
 145                         {\r
 146                                 HyperLink toDisplay = new HyperLink();\r
 147                                 toDisplay.Text                 = Text;\r
 148                                 toDisplay.NavigateUrl          = NavigateUrl;\r
 149                                 toDisplay.Target               = Target;\r
 150                                 if(DataTextField.Length > 0 || DataNavigateUrlField.Length>0)\r
 151                                 {\r
 152                                         toDisplay.DataBinding += new EventHandler(OnDataBindHyperLinkColumn);\r
 153                                 }\r
 154                                 cell.Controls.Add(toDisplay);\r
 155                         }\r
 156                 }\r
 157 \r
 158                 private void OnDataBindHyperLinkColumn(object sender, EventArgs e)\r
 159                 {\r
 160                         HyperLink link = (HyperLink)sender;\r
 161                         object item    = ((DataGridItem)link.NamingContainer).DataItem;\r
 162                         if(textFieldDescriptor == null && urlFieldDescriptor == null)\r
 163                         {\r
 164                                 textFieldDescriptor = TypeDescriptor.GetProperties(item).Find(DataTextField, true);\r
 165                                 if(textFieldDescriptor == null && !DesignMode)\r
 166                                         throw new HttpException(HttpRuntime.FormatResourceString("Field_Not_Found", DataTextField));\r
 167                                 urlFieldDescriptor = TypeDescriptor.GetProperties(item).Find(DataNavigateUrlField, true);\r
 168                                 if(urlFieldDescriptor == null && !DesignMode)\r
 169                                         throw new HttpException(HttpRuntime.FormatResourceString("Field_Not_Found", DataNavigateUrlField));\r
 170                         }\r
 171 \r
 172                         if(textFieldDescriptor != null)\r
 173                         {\r
 174                                 link.Text = FormatDataTextValue(textFieldDescriptor.GetValue(item));\r
 175                         } else\r
 176                         {\r
 177                                 link.Text = "Sample_DataBound_Text";\r
 178                         }\r
 179 \r
 180                         if(urlFieldDescriptor != null)\r
 181                         {\r
 182                                 link.NavigateUrl = FormatDataNavigateUrlValue(urlFieldDescriptor.GetValue(item));\r
 183                         } else\r
 184                         {\r
 185                                 link.NavigateUrl = "url";\r
 186                         }\r
 187                 }\r
 188 \r
 189                 protected virtual string FormatDataNavigateUrlValue(object dataUrlValue)\r
 190                 {\r
 191                         string retVal = String.Empty;\r
 192                         if(dataUrlValue != null)\r
 193                         {\r
 194                                 if(DataNavigateUrlFormatString.Length > 0)\r
 195                                 {\r
 196                                         retVal = String.Format(DataNavigateUrlFormatString, dataUrlValue);\r
 197                                 } else\r
 198                                 {\r
 199                                         retVal = dataUrlValue.ToString();\r
 200                                 }\r
 201                         }\r
 202                         return retVal;\r
 203                 }\r
 204 \r
 205                 protected virtual string FormatDataTextValue(object dataTextValue)\r
 206                 {\r
 207                         string retVal = String.Empty;\r
 208                         if(dataTextValue != null)\r
 209                         {\r
 210                                 if(DataTextFormatString.Length > 0)\r
 211                                 {\r
 212                                         retVal = String.Format(DataTextFormatString, dataTextValue);\r
 213                                 } else\r
 214                                 {\r
 215                                         retVal = dataTextValue.ToString();\r
 216                                 }\r
 217                         }\r
 218                         return retVal;\r
 219                 }\r
 220         }\r
 221 }\r