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

   1 //
   2 // System.Web.UI.WebControls.ImageButton.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 //\r
  11 \r
  12 using System;\r
  13 using System.Collections;\r
  14 using System.Collections.Specialized;\r
  15 using System.Web;\r
  16 using System.Web.UI;\r
  17 using System.ComponentModel;\r
  18 \r
  19 namespace System.Web.UI.WebControls\r
  20 {\r
  21         [DefaultEvent("Click")]\r
  22         public class ImageButton: Image, IPostBackDataHandler, IPostBackEventHandler\r
  23         {\r
  24                 private static readonly object ClickEvent   = new object();\r
  25                 private static readonly object CommandEvent = new object();\r
  26 \r
  27                 private int x, y;\r
  28 \r
  29                 public ImageButton(): base()\r
  30                 {\r
  31                 }\r
  32
  33                 [DefaultValue (true), Bindable (false), WebCategory ("Behavior")]
  34                 [WebSysDescription ("Determines if validation is performed when clicked.")]\r
  35                 public bool CausesValidation\r
  36                 {\r
  37                         get\r
  38                         {\r
  39                                 object o = ViewState["CausesValidation"];\r
  40                                 if(o!=null)\r
  41                                         return (bool)o;\r
  42                                 return true;\r
  43                         }\r
  44                         set\r
  45                         {\r
  46                                 ViewState["CausesValidation"] = value;\r
  47                         }\r
  48                 }\r
  49
  50                 [DefaultValue (""), Bindable (true), WebCategory ("Behavior")]
  51                 [WebSysDescription ("An argument for the Command of this control.")]\r
  52                 public string CommandArgument\r
  53                 {\r
  54                         get\r
  55                         {\r
  56                                 object o = ViewState["CommandArgument"];\r
  57                                 if(o!=null)\r
  58                                         return (string)o;\r
  59                                 return String.Empty;\r
  60                         }\r
  61                         set\r
  62                         {\r
  63                                 ViewState["CommandArgument"] = value;\r
  64                         }\r
  65                 }\r
  66
  67                 [DefaultValue (""), WebCategory ("Behavior")]
  68                 [WebSysDescription ("The name of the Command of this control.")]\r
  69                 public string CommandName\r
  70                 {\r
  71                         get\r
  72                         {\r
  73                                 object o = ViewState["CommandName"];\r
  74                                 if(o!=null)\r
  75                                         return (string)o;\r
  76                                 return String.Empty;\r
  77                         }\r
  78                         set\r
  79                         {\r
  80                                 ViewState["CommandName"] = value;\r
  81                         }\r
  82                 }\r
  83 \r
  84                 [Browsable (false)]
  85                 [DesignerSerializationVisibility (DesignerSerializationVisibility.Hidden)]
  86                 protected override HtmlTextWriterTag TagKey\r
  87                 {\r
  88                         get\r
  89                         {\r
  90                                 return HtmlTextWriterTag.Input;\r
  91                         }\r
  92                 }\r
  93
  94                 [WebCategory ("Action")]
  95                 [WebSysDescription ("Raised when the LinkButton is clicked.")]\r
  96                 public event ImageClickEventHandler Click\r
  97                 {\r
  98                         add\r
  99                         {\r
 100                                 Events.AddHandler(ClickEvent, value);\r
 101                         }\r
 102                         remove\r
 103                         {\r
 104                                 Events.RemoveHandler(ClickEvent, value);\r
 105                         }\r
 106                 }\r
 107
 108                 [WebCategory ("Action")]
 109                 [WebSysDescription ("Raised when a LinkButton Command is executed.")]\r
 110                 public event CommandEventHandler Command\r
 111                 {\r
 112                         add\r
 113                         {\r
 114                                 Events.AddHandler(CommandEvent, value);\r
 115                         }\r
 116                         remove\r
 117                         {\r
 118                                 Events.RemoveHandler(CommandEvent, value);\r
 119                         }\r
 120                 }\r
 121 \r
 122                 protected override void AddAttributesToRender(HtmlTextWriter writer)\r
 123                 {\r
 124                         writer.AddAttribute(HtmlTextWriterAttribute.Type, "image");\r
 125                         writer.AddAttribute(HtmlTextWriterAttribute.Name, UniqueID);\r
 126                         if(Page != null && CausesValidation)\r
 127                         {\r
 128                                 if(Page.Validators.Count > 0)\r
 129                                 {\r
 130                                         writer.AddAttribute(HtmlTextWriterAttribute.Onclick, Utils.GetClientValidatedEvent(Page));\r
 131                                         writer.AddAttribute("language", "javascript");\r
 132                                 }\r
 133                         }\r
 134                         base.AddAttributesToRender(writer);\r
 135                 }\r
 136 \r
 137                 protected virtual void OnClick(ImageClickEventArgs e)\r
 138                 {\r
 139                         if(Events != null)\r
 140                         {\r
 141                                 ImageClickEventHandler iceh = (ImageClickEventHandler)(Events[ClickEvent]);\r
 142                                 if(iceh != null)\r
 143                                         iceh(this, e);\r
 144                         }\r
 145                 }\r
 146 \r
 147                 protected virtual void OnCommand(CommandEventArgs e)\r
 148                 {\r
 149                         if(Events != null)\r
 150                         {\r
 151                                 CommandEventHandler ceh = (CommandEventHandler)(Events[CommandEvent]);\r
 152                                 if(ceh != null)\r
 153                                         ceh(this, e);\r
 154                                 RaiseBubbleEvent(this, e);\r
 155                         }\r
 156                 }\r
 157 \r
 158                 protected override void OnPreRender(EventArgs e)\r
 159                 {\r
 160                         if(Page != null)\r
 161                         {\r
 162                                 Page.RegisterRequiresPostBack(this);\r
 163                         }\r
 164                 }\r
 165 \r
 166                 bool IPostBackDataHandler.LoadPostData(string postDataKey, NameValueCollection postCollection)\r
 167                 {\r
 168                         string xCoord = postCollection[UniqueID + ".x"];\r
 169                         string yCoord = postCollection[UniqueID + ".y"];\r
 170                         string id = postCollection[UniqueID];
 171                         if(xCoord != null && yCoord != null && xCoord.Length > 0 && yCoord.Length > 0)\r
 172                         {\r
 173                                 x = Int32.Parse(xCoord);\r
 174                                 y = Int32.Parse(yCoord);\r
 175                                 Page.RegisterRequiresRaiseEvent(this);
 176                         } else if (id != null)
 177                         {
 178                                 //
 179                                 // This is a workaround for bug #49819. It appears that the .x and .y
 180                                 // values are not being posted, and only the x value is being posted
 181                                 // with the ctrl's id as the key.
 182                                 //
 183                                 x = Int32.Parse (id);
 184                                 Page.RegisterRequiresRaiseEvent (this);
 185                         }
 186                         return false;\r
 187                 }\r
 188 \r
 189                 void IPostBackDataHandler.RaisePostDataChangedEvent()\r
 190                 {\r
 191                 }\r
 192 \r
 193                 void IPostBackEventHandler.RaisePostBackEvent(string eventArgument)\r
 194                 {\r
 195                         if(CausesValidation)\r
 196                                 Page.Validate();\r
 197                         OnClick(new ImageClickEventArgs(x, y));\r
 198                         OnCommand(new CommandEventArgs(CommandName, CommandArgument));\r
 199                 }\r
 200         }\r
 201 }\r