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  * Contact: <my_scripts2001@yahoo.com>, <gvaish@iitk.ac.in>\r
   7  * Status:  20%\r
   8  * \r
   9  * (C) Gaurav Vaish (2001)\r
  10  */\r
  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 Button : WebControl, IPostBackEventHandler\r
  20         {\r
  21                 private static readonly object ClickEvent   = new object();\r
  22                 private static readonly object CommandEvent = new object();\r
  23 \r
  24                 //private EventHandlerList ehList;\r
  25 \r
  26                 public Button()\r
  27                 {\r
  28                         // TODO: Initialization\r
  29                 }\r
  30 \r
  31                 [Bindable(true)]\r
  32                 public bool CausesValidation\r
  33                 {\r
  34                         get\r
  35                         {\r
  36                                 Object cv = ViewState["CausesValidation"];\r
  37                                 if(cv!=null)\r
  38                                         return (Boolean)cv;\r
  39                                 return true;\r
  40                         }\r
  41                         set\r
  42                         {\r
  43                                 //causesValidation = value;\r
  44                                 ViewState["CausesValidation"] = value;\r
  45                         }\r
  46                 }\r
  47 \r
  48                 [Bindable(true)]\r
  49                 public string CommandArgument\r
  50                 {\r
  51                         get\r
  52                         {\r
  53                                 //return commandArgument;\r
  54                                 string ca = (string) ViewState["CommandArgument"];\r
  55                                 if(ca!=null)\r
  56                                         return ca;\r
  57                                 return String.Empty;\r
  58                         }\r
  59                         set\r
  60                         {\r
  61                                 //commandArgument = value;\r
  62                                 ViewState["CommandArgument"] = value;\r
  63                         }\r
  64                 }\r
  65 \r
  66                 public string CommandName\r
  67                 {\r
  68                         get\r
  69                         {\r
  70                                 string cn = (string)ViewState["CommandName"];\r
  71                                 if(cn!=null)\r
  72                                         return cn;\r
  73                                 return String.Empty;\r
  74                         }\r
  75                         set\r
  76                         {\r
  77                                 ViewState["CommandArgument"] = value;\r
  78                         }\r
  79                 }\r
  80 \r
  81                 [\r
  82                         Bindable(true),\r
  83                         DefaultValueAttribute("")\r
  84                 ]\r
  85                 //[WebSysDescriptionAttribute("Button_Text")]\r
  86                 //[WebCategoryAttribute("Appearance")]\r
  87                 public string Text\r
  88                 {\r
  89                         get\r
  90                         {\r
  91                                 string text = (string)ViewState["Text"];\r
  92                                 if(text!=null)\r
  93                                         return text;\r
  94                                 return String.Empty;\r
  95                         }\r
  96                         set\r
  97                         {\r
  98                                 ViewState["Text"] = value;\r
  99                         }\r
 100                 }\r
 101 \r
 102                 public event EventHandler Click\r
 103                 {\r
 104                         add\r
 105                         {\r
 106                                 Events.AddHandler(ClickEvent, value);\r
 107                         }\r
 108                         remove\r
 109                         {\r
 110                                 Events.RemoveHandler(ClickEvent, value);\r
 111                         }\r
 112                 }\r
 113 \r
 114                 public event CommandEventHandler Command\r
 115                 {\r
 116                         add\r
 117                         {\r
 118                                 Events.AddHandler(CommandEvent, value);\r
 119                         }\r
 120                         remove\r
 121                         {\r
 122                                 Events.RemoveHandler(CommandEvent, value);\r
 123                         }\r
 124                 }\r
 125                 \r
 126                 protected virtual void OnClick(EventArgs e)\r
 127                 {\r
 128                         if(Events != null)\r
 129                         {\r
 130                                 EventHandler eh = (EventHandler)(Events[ClickEvent]);\r
 131                                 if(eh!= null)\r
 132                                         eh(this,e);\r
 133                         }\r
 134                 }\r
 135 \r
 136                 protected virtual void OnCommand(CommandEventArgs e)\r
 137                 {\r
 138                         if(Events != null)\r
 139                         {\r
 140                                 EventHandler eh = (EventHandler)(Events[CommandEvent]);\r
 141                                 if(eh!= null)\r
 142                                         eh(this,e);\r
 143                         }\r
 144                 }\r
 145                 \r
 146                 public void RaisePostBackEvent(string eventArgument)\r
 147                 {\r
 148                         /* Will have to see what work needs to be done before I actually call OnClick\r
 149                          * Basically I have to see what is to be done with the string argument\r
 150                         */\r
 151                         if(CausesValidation)\r
 152                         {\r
 153                                 Page.Validate();\r
 154                                 OnClick(new EventArgs());\r
 155                                 OnCommand(new CommandEventArgs(CommandName, CommandArgument));\r
 156                         }\r
 157                 }\r
 158                 \r
 159                 protected override void AddAttributesToRender(HtmlTextWriter writer)\r
 160                 {\r
 161                         //??\r
 162                         writer.AddAttribute(HtmlTextWriterAttribute.Type,"submit");\r
 163                         writer.AddAttribute(HtmlTextWriterAttribute.Name,base.UniqueID);\r
 164                         writer.AddAttribute(HtmlTextWriterAttribute.Value,Text);\r
 165                         if(Page!=null)\r
 166                         {\r
 167                                 if(CausesValidation)\r
 168                                 {\r
 169                                         //Page.Validators.Count\r
 170                                         //writer.AddAttribute(HtmlTextWriterAttribute.OnClick, <<The validationcode>>);\r
 171                                         writer.AddAttribute("language","javascript");\r
 172                                 }\r
 173                         }\r
 174                 }\r
 175                 \r
 176                 protected override void RenderContents(HtmlTextWriter writer)\r
 177                 {\r
 178                         // Preventing\r
 179                 }\r
 180         }\r
 181 }\r