mcs/class/System.Web/System.Web.UI.HtmlControls/HtmlInputImage.cs

   1 /*      System.Web.UI.HtmlControls\r
   2 *       Authors\r
   3 *               Leen Toelen (toelen@hotmail.com)\r
   4 */\r
   5 \r
   6 using System;\r
   7 using System.Collections.Specialized;\r
   8 using System.ComponentModel;\r
   9 using System.Globalization;\r
  10 using System.Web;\r
  11 using System.Web.UI;\r
  12 \r
  13 namespace System.Web.UI.HtmlControls{\r
  14         \r
  15         [DefaultEvent("ServerClick")]\r
  16         public class HtmlInputImage : HtmlInputControl, IPostBackEventHandler, IPostBackDataHandler{\r
  17                 \r
  18                 private static readonly object EventServerClick = new object ();\r
  19                 private int _x, _y;\r
  20                 \r
  21                 public HtmlInputImage(): base("image"){}\r
  22                 \r
  23                 protected override void OnPreRender(EventArgs e){\r
  24                         if (Page != null && !Disabled){\r
  25                                 Page.RegisterRequiresPostBack(this);\r
  26                         }\r
  27                 }\r
  28                 \r
  29                 protected override void RenderAttributes(HtmlTextWriter writer)\r
  30                 {\r
  31                         base.RenderAttributes (writer);\r
  32                         // Anything else?\r
  33                 }\r
  34 \r
  35                 protected virtual void OnServerClick(ImageClickEventArgs e){\r
  36                         ImageClickEventHandler handler = (ImageClickEventHandler) Events[EventServerClick];\r
  37                         if (handler != null) handler (this, e);\r
  38                 }\r
  39                 \r
  40                 bool IPostBackDataHandler.LoadPostData (string postDataKey,\r
  41                                                        NameValueCollection postCollection)\r
  42                 {\r
  43                         string postX = postCollection[String.Concat(RenderedName,".x")];\r
  44                         string postY = postCollection[String.Concat(RenderedName,".y")];\r
  45                         if (postX != null && postY != null && postX.Length >= 0 && postY.Length >= 0){\r
  46                                 _x = Int32.Parse(postX, CultureInfo.InvariantCulture);\r
  47                                 _y = Int32.Parse(postY, CultureInfo.InvariantCulture);\r
  48                                 Page.RegisterRequiresRaiseEvent(this);\r
  49                         }\r
  50                         return false;\r
  51                 }\r
  52                 \r
  53                 void IPostBackEventHandler.RaisePostBackEvent (string eventArgument)\r
  54                 {\r
  55                         if (CausesValidation)\r
  56                                 Page.Validate();\r
  57                         OnServerClick (new ImageClickEventArgs(_x, _y));\r
  58                 }\r
  59                 \r
  60                 void IPostBackDataHandler.RaisePostDataChangedEvent ()\r
  61                 {\r
  62                 }\r
  63                 \r
  64                 [WebCategory("Action")]\r
  65                 [WebSysDescription("Fires when the image is clicked.")]\r
  66                 public event ImageClickEventHandler ServerClick{\r
  67                         add{\r
  68                                 Events.AddHandler(EventServerClick, value);\r
  69                         }\r
  70                         remove{\r
  71                                 Events.RemoveHandler(EventServerClick, value);\r
  72                         }\r
  73                 }\r
  74                 \r
  75                 [DefaultValue("")]\r
  76                 [WebCategory("Appearance")]\r
  77                 [DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]\r
  78                 public string Align{\r
  79                         get{\r
  80                                 string attr = Attributes["align"];\r
  81                                 if (attr != null) return attr;\r
  82                                 return String.Empty;\r
  83                         }\r
  84                         set{\r
  85                                 Attributes["align"] = AttributeToString(value);\r
  86                         }\r
  87                 }\r
  88                 \r
  89                 [DefaultValue("")]\r
  90                 [WebCategory("Appearance")]\r
  91                 [DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]\r
  92                 public string Alt{\r
  93                         get{\r
  94                                 string attr = Attributes["alt"];\r
  95                                 if (attr != null) return attr;\r
  96                                 return String.Empty;\r
  97                         }\r
  98                         set{\r
  99                                 Attributes["alt"] = AttributeToString(value);\r
 100                         }\r
 101                 }\r
 102                 \r
 103                 [DefaultValue("")]\r
 104                 [WebCategory("Appearance")]\r
 105                 [DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]\r
 106                 public int Border{\r
 107                         get{\r
 108                                 string attr = Attributes["border"];\r
 109                                 if (attr != null) return Int32.Parse(attr,CultureInfo.InvariantCulture);\r
 110                                 return -1;\r
 111                         }\r
 112                         set{\r
 113                                 Attributes["border"] = AttributeToString(value);\r
 114                         }\r
 115                 }\r
 116                 \r
 117                 [DefaultValue(true)]\r
 118                 [WebCategory("Behavior")]\r
 119                 public bool CausesValidation{\r
 120                         get{\r
 121                                 object causesVal = ViewState["CausesValidation"];\r
 122                                 if (causesVal != null) return (Boolean) causesVal;\r
 123                                 return true;\r
 124                         }\r
 125                         set{\r
 126                                 ViewState["CausesValidation"] = (Boolean) value;\r
 127                         }\r
 128                 }\r
 129                 \r
 130                 [DefaultValue("")]\r
 131                 [WebCategory("Appearance")]\r
 132                 [DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]\r
 133                 public string Src{\r
 134                         get{\r
 135                                 string attr = Attributes["src"];\r
 136                                 if (attr != null) return attr;\r
 137                                 return String.Empty;\r
 138                         }\r
 139                         set{\r
 140                                 Attributes["src"] = AttributeToString(value);\r
 141                         }\r
 142                 }\r
 143         } // class HtmlInputImage\r
 144 } // namespace System.Web.UI.HtmlControls\r
 145 \r