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

   1 /**\r
   2  * Namespace: System.Web.UI.WebControls\r
   3  * Class:     Button\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:  20%\r
   9  * \r
  10  * (C) Gaurav Vaish (2001)\r
  11  */\r
  12 \r
  13 using System;\r
  14 using System.ComponentModel;\r
  15 using System.Web;\r
  16 using System.Web.UI;\r
  17 \r
  18 namespace System.Web.UI.WebControls\r
  19 {\r
  20         public class Button : WebControl, IPostBackEventHandler\r
  21         {\r
  22                 private static readonly object ClickEvent   = new object();\r
  23                 private static readonly object CommandEvent = new object();\r
  24 \r
  25                 //private EventHandlerList ehList;\r
  26 \r
  27                 public Button()\r
  28                 {\r
  29                         // TODO: Initialization\r
  30                 }\r
  31 \r
  32                 [Bindable(true)]\r
  33                 public bool CausesValidation\r
  34                 {\r
  35                         get\r
  36                         {\r
  37                                 Object cv = ViewState["CausesValidation"];\r
  38                                 if(cv!=null)\r
  39                                         return (Boolean)cv;\r
  40                                 return true;\r
  41                         }\r
  42                         set\r
  43                         {\r
  44                                 //causesValidation = value;\r
  45                                 ViewState["CausesValidation"] = value;\r
  46                         }\r
  47                 }\r
  48 \r
  49                 [Bindable(true)]\r
  50                 public string CommandArgument\r
  51                 {\r
  52                         get\r
  53                         {\r
  54                                 //return commandArgument;\r
  55                                 string ca = (string) ViewState["CommandArgument"];\r
  56                                 if(ca!=null)\r
  57                                         return ca;\r
  58                                 return String.Empty;\r
  59                         }\r
  60                         set\r
  61                         {\r
  62                                 //commandArgument = value;\r
  63                                 ViewState["CommandArgument"] = value;\r
  64                         }\r
  65                 }\r
  66 \r
  67                 public string CommandName\r
  68                 {\r
  69                         get\r
  70                         {\r
  71                                 string cn = (string)ViewState["CommandName"];\r
  72                                 if(cn!=null)\r
  73                                         return cn;\r
  74                                 return String.Empty;\r
  75                         }\r
  76                         set\r
  77                         {\r
  78                                 ViewState["CommandArgument"] = value;\r
  79                         }\r
  80                 }\r
  81 \r
  82                 [\r
  83                         Bindable(true),\r
  84                         DefaultValueAttribute("")\r
  85                 ]\r
  86                 //[WebSysDescriptionAttribute("Button_Text")]\r
  87                 //[WebCategoryAttribute("Appearance")]\r
  88                 public string Text\r
  89                 {\r
  90                         get\r
  91                         {\r
  92                                 string text = (string)ViewState["Text"];\r
  93                                 if(text!=null)\r
  94                                         return text;\r
  95                                 return String.Empty;\r
  96                         }\r
  97                         set\r
  98                         {\r
  99                                 ViewState["Text"] = value;\r
 100                         }\r
 101                 }\r
 102 \r
 103                 public event EventHandler Click\r
 104                 {\r
 105                         add\r
 106                         {\r
 107                                 Events.AddHandler(ClickEvent, value);\r
 108                         }\r
 109                         remove\r
 110                         {\r
 111                                 Events.RemoveHandler(ClickEvent, value);\r
 112                         }\r
 113                 }\r
 114 \r
 115                 public event CommandEventHandler Command\r
 116                 {\r
 117                         add\r
 118                         {\r
 119                                 Events.AddHandler(CommandEvent, value);\r
 120                         }\r
 121                         remove\r
 122                         {\r
 123                                 Events.RemoveHandler(CommandEvent, value);\r
 124                         }\r
 125                 }\r
 126                 \r
 127                 protected virtual void OnClick(EventArgs e)\r
 128                 {\r
 129                         if(Events != null)\r
 130                         {\r
 131                                 EventHandler eh = (EventHandler)(Events[ClickEvent]);\r
 132                                 if(eh!= null)\r
 133                                         eh(this,e);\r
 134                         }\r
 135                 }\r
 136 \r
 137                 protected virtual void OnCommand(CommandEventArgs e)\r
 138                 {\r
 139                         if(Events != null)\r
 140                         {\r
 141                                 EventHandler eh = (EventHandler)(Events[CommandEvent]);\r
 142                                 if(eh!= null)\r
 143                                         eh(this,e);\r
 144                         }\r
 145                 }\r
 146                 \r
 147                 public void RaisePostBackEvent(string eventArgument)\r
 148                 {\r
 149                         /* Will have to see what work needs to be done before I actually call OnClick\r
 150                          * Basically I have to see what is to be done with the string argument\r
 151                         */\r
 152                         if(CausesValidation)\r
 153                         {\r
 154                                 Page.Validate();\r
 155                                 OnClick(new EventArgs());\r
 156                                 OnCommand(new CommandEventArgs(CommandName, CommandArgument));\r
 157                         }\r
 158                 }\r
 159                 \r
 160                 protected override void AddAttributesToRender(HtmlTextWriter writer)\r
 161                 {\r
 162                         //??\r
 163                         writer.AddAttribute(HtmlTextWriterAttribute.Type,"submit");\r
 164                         writer.AddAttribute(HtmlTextWriterAttribute.Name,base.UniqueID);\r
 165                         writer.AddAttribute(HtmlTextWriterAttribute.Value,Text);\r
 166                         if(Page!=null)\r
 167                         {\r
 168                                 if(CausesValidation)\r
 169                                 {\r
 170                                         //Page.Validators.Count\r
 171                                         //writer.AddAttribute(HtmlTextWriterAttribute.OnClick, <<The validationcode>>);\r
 172                                         writer.AddAttribute("language","javascript");\r
 173                                 }\r
 174                         }\r
 175                         throw new NotImplementedException();\r
 176                 }\r
 177                 \r
 178                 protected override void RenderContents(HtmlTextWriter writer)\r
 179                 {\r
 180                         // Preventing subclasses to do anything\r
 181                 }\r
 182         }\r
 183 }\r