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

   1 //
   2 // System.Web.UI.WebControls.ButtonColumn.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.ComponentModel;\r
  14 using System.Web;\r
  15 using System.Web.UI;\r
  16 \r
  17 namespace System.Web.UI.WebControls\r
  18 {\r
  19         public class ButtonColumn : DataGridColumn\r
  20         {\r
  21                 private PropertyDescriptor textFieldDescriptor;\r
  22                 \r
  23                 public ButtonColumn(): base()\r
  24                 {\r
  25                 }\r
  26 \r
  27                 public override void Initialize()\r
  28                 {\r
  29                         base.Initialize();\r
  30                         textFieldDescriptor = null;\r
  31                 }\r
  32                 \r
  33                 public override void InitializeCell(TableCell cell, int columnIndex, ListItemType itemType)\r
  34                 {\r
  35                         base.InitializeCell(cell, columnIndex, itemType);\r
  36                         if (Enum.IsDefined(typeof(ListItemType), itemType) &&\r
  37                             itemType != ListItemType.Footer &&\r
  38                             itemType != ListItemType.Header)\r
  39                         {\r
  40                                 WebControl toDisplay = null;\r
  41                                 if(ButtonType == ButtonColumnType.PushButton)\r
  42                                 {\r
  43                                         Button b = new Button();\r
  44                                         b.Text = Text;\r
  45                                         b.CommandName = CommandName;\r
  46                                         b.CausesValidation = false;\r
  47                                         toDisplay = b;\r
  48                                 } else\r
  49                                 {\r
  50                                         LinkButton lb = new DataGridLinkButton();\r
  51                                         lb.Text = Text;\r
  52                                         lb.CommandName = CommandName;\r
  53                                         lb.CausesValidation = false;\r
  54                                         toDisplay = lb;\r
  55                                 }\r
  56                                 if(DataTextField.Length > 0)\r
  57                                 {\r
  58                                         toDisplay.DataBinding += new EventHandler(OnDataBindButtonColumn);\r
  59                                 }\r
  60                                 cell.Controls.Add(toDisplay);\r
  61                         }\r
  62                 }\r
  63                 \r
  64                 private void OnDataBindButtonColumn(object sender, EventArgs e)\r
  65                 {\r
  66                         Control ctrl = (Control)sender;\r
  67                         object item = ((DataGridItem)ctrl.NamingContainer).DataItem;\r
  68                         if(textFieldDescriptor == null)\r
  69                         {\r
  70                                 textFieldDescriptor = TypeDescriptor.GetProperties(item).Find(DataTextField, true);\r
  71                                 if(textFieldDescriptor == null && !DesignMode)\r
  72                                         throw new HttpException(HttpRuntime.FormatResourceString("Field_Not_Found", DataTextField));\r
  73                         }\r
  74                         string text;\r
  75                         if(textFieldDescriptor != null)\r
  76                         {\r
  77                                 text = FormatDataTextValue(textFieldDescriptor.GetValue(item));\r
  78                         } else\r
  79                         {\r
  80                                 text = "Sample_DataBound_Text";\r
  81                         }\r
  82                         if(ctrl is LinkButton)\r
  83                         {\r
  84                                 ((LinkButton)ctrl).Text = text;\r
  85                         }\r
  86                         else\r
  87                         {\r
  88                                 ((Button)ctrl).Text = text;\r
  89                         }\r
  90                 }\r
  91                 \r
  92                 protected virtual string FormatDataTextValue(object dataTextValue)\r
  93                 {\r
  94                         string retVal = null;\r
  95                         if(dataTextValue != null)\r
  96                         {\r
  97                                 if(DataTextFormatString.Length > 0)\r
  98                                 {\r
  99                                         retVal = String.Format(DataTextFormatString, dataTextValue);\r
 100                                 }\r
 101                                 else\r
 102                                 {\r
 103                                         retVal = dataTextValue.ToString();\r
 104                                 }\r
 105                         }\r
 106                         return retVal;\r
 107                 }
 108
 109                 // LAMESPEC The framework uses Description values for metadata here. However they should be WebSysDescriptions
 110                 // because all metadata in this namespace has WebSysDescriptions\r
 111
 112                 [DefaultValue (typeof (ButtonColumnType), "LinkButton"), WebCategory ("Misc")]
 113                 [Description ("The type of button used in this column.")]\r
 114                 public virtual ButtonColumnType ButtonType\r
 115                 {\r
 116                         get\r
 117                         {\r
 118                                 object o = ViewState["ButtonType"];\r
 119                                 if(o!=null)\r
 120                                         return (ButtonColumnType)o;\r
 121                                 return ButtonColumnType.LinkButton;\r
 122                         }\r
 123                         set\r
 124                         {\r
 125                                 if(!System.Enum.IsDefined(typeof(ButtonColumnType), value))\r
 126                                         throw new ArgumentException();\r
 127                                 ViewState["ButtonType"] = value;\r
 128                         }\r
 129                 }\r
 130
 131                 [DefaultValue (""), WebCategory ("Misc")]
 132                 [Description ("The command assigned to this column.")]\r
 133                 public virtual string CommandName\r
 134                 {\r
 135                         get\r
 136                         {\r
 137                                 string cn = (string)ViewState["CommandName"];\r
 138                                 if(cn!=null)\r
 139                                         return cn;\r
 140                                 return String.Empty;\r
 141                         }\r
 142                         set\r
 143                         {\r
 144                                 ViewState["CommandName"] = value;\r
 145                         }\r
 146                 }\r
 147
 148                 [DefaultValue (""), WebCategory ("Misc")]
 149                 [Description ("The datafield that is bound to the text property.")]\r
 150                 public virtual string DataTextField\r
 151                 {\r
 152                         get\r
 153                         {\r
 154                                 string dtf = (string)ViewState["DataTextField"];\r
 155                                 if(dtf!=null)\r
 156                                         return dtf;\r
 157                                 return String.Empty;\r
 158                         }\r
 159                         set\r
 160                         {\r
 161                                 ViewState["DataTextField"] = value;\r
 162                         }\r
 163                 }\r
 164
 165                 [DefaultValue (""), WebCategory ("Misc")]
 166                 [Description ("A format that is applied to the bound text property.")]\r
 167                 public virtual string DataTextFormatString\r
 168                 {\r
 169                         get\r
 170                         {\r
 171                                 string dtfs = (string)ViewState["DataTextFormatString"];\r
 172                                 if(dtfs!=null)\r
 173                                         return dtfs;\r
 174                                 return String.Empty;\r
 175                         }\r
 176                         set\r
 177                         {\r
 178                                 ViewState["DataTextFormatString"] = value;\r
 179                         }\r
 180                 }\r
 181
 182                 [DefaultValue (""), WebCategory ("Misc")]
 183                 [Description ("The text used for this button.")]\r
 184                 public virtual string Text\r
 185                 {\r
 186                         get\r
 187                         {\r
 188                                 string text = (string)ViewState["Text"];\r
 189                                 if(text!=null)\r
 190                                         return text;\r
 191                                 return String.Empty;\r
 192                         }\r
 193                         set\r
 194                         {\r
 195                                 ViewState["Text"] = value;\r
 196                         }\r
 197                 }\r
 198         }\r
 199 }\r