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

   1 /**\r
   2  * Namespace: System.Web.UI.WebControls\r
   3  * Class:     HyperLink\r
   4  *\r
   5  * Author:  Gaurav Vaish\r
   6  * Maintainer: gvaish@iitk.ac.in\r
   7  * Contact: gvaish@iitk.ac.in, myscripts_2001@yahoo.com\r
   8  * Implementation: yes\r
   9  * Status:  100%\r
  10  *\r
  11  * (C) Gaurav Vaish (2001)\r
  12  */\r
  13 \r
  14 using System;\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         [DefaultProperty("Text")]\r
  22         //[Designer(??)]\r
  23         [ControlBuilder(typeof(HyperLinkControlBuilder))]\r
  24         //[DataBindingHandler("??")]\r
  25         [ParseChildren(false)]\r
  26         [ToolboxData("<{0}:HyperLink runat=\"server\">HyperLink</{0}:HyperLink>")]\r
  27         public class HyperLink: WebControl\r
  28         {\r
  29                 bool textSet;\r
  30 \r
  31                 public HyperLink(): base(HtmlTextWriterTag.A)\r
  32                 {\r
  33                 }\r
  34 \r
  35                 public virtual string ImageUrl\r
  36                 {\r
  37                         get\r
  38                         {\r
  39                                 object o = ViewState["ImageUrl"];\r
  40                                 if(o!=null)\r
  41                                         return (string)o;\r
  42                                 return String.Empty;\r
  43                         }\r
  44                         set\r
  45                         {\r
  46                                 ViewState["ImageUrl"] = value;\r
  47                         }\r
  48                 }\r
  49 \r
  50                 public string NavigateUrl\r
  51                 {\r
  52                         get\r
  53                         {\r
  54                                 object o = ViewState["NavigateUrl"];\r
  55                                 if(o!=null)\r
  56                                         return (string)o;\r
  57                                 return String.Empty;\r
  58                         }\r
  59                         set\r
  60                         {\r
  61                                 ViewState["NavigateUrl"] = value;\r
  62                         }\r
  63                 }\r
  64 \r
  65                 public string Target\r
  66                 {\r
  67                         get\r
  68                         {\r
  69                                 object o = ViewState["Target"];\r
  70                                 if(o!=null)\r
  71                                         return (string)o;\r
  72                                 return String.Empty;\r
  73                         }\r
  74                         set\r
  75                         {\r
  76                                 ViewState["Target"] = value;\r
  77                         }\r
  78                 }\r
  79 \r
  80                 public virtual string Text\r
  81                 {\r
  82                         get {\r
  83                                 object o = ViewState ["Text"];\r
  84                                 if (o != null)\r
  85                                         return (string) o;\r
  86 \r
  87                                 return String.Empty;\r
  88                         }\r
  89                         set {\r
  90                                 ViewState["Text"] = value;\r
  91                                 textSet = true;\r
  92                         }\r
  93                 }\r
  94 \r
  95                 string InternalText\r
  96                 {\r
  97                         get { return Text; }\r
  98                         set { ViewState["Text"] = value; }\r
  99                 }\r
 100 \r
 101                 protected override void AddAttributesToRender(HtmlTextWriter writer)\r
 102                 {\r
 103                         base.AddAttributesToRender(writer);\r
 104                         if(NavigateUrl.Length > 0)\r
 105                         {\r
 106                                 writer.AddAttribute(HtmlTextWriterAttribute.Href, NavigateUrl);\r
 107                         }\r
 108                         if(Target.Length > 0)\r
 109                         {\r
 110                                 writer.AddAttribute(HtmlTextWriterAttribute.Target, Target);\r
 111                         }\r
 112                 }\r
 113 \r
 114                 protected override void AddParsedSubObject(object obj)\r
 115                 {\r
 116                         if(HasControls())\r
 117                         {\r
 118                                 base.AddParsedSubObject(obj);\r
 119                                 return;\r
 120                         }\r
 121                         if(obj is LiteralControl)\r
 122                         {\r
 123                                 // This is a hack to workaround the behaviour of the code generator, which\r
 124                                 // may split a text in several LiteralControls if there's a special character\r
 125                                 // such as '<' in it.\r
 126                                 if (textSet) {\r
 127                                         Text = ((LiteralControl)obj).Text;\r
 128                                         textSet = false;\r
 129                                 } else {\r
 130                                         InternalText += ((LiteralControl)obj).Text;\r
 131                                 }\r
 132                                 //\r
 133 \r
 134                                 return;\r
 135                         }\r
 136                         if(Text.Length > 0)\r
 137                         {\r
 138                                 base.AddParsedSubObject(new LiteralControl (Text));\r
 139                                 Text = String.Empty;\r
 140                         }\r
 141                         base.AddParsedSubObject (obj);\r
 142                 }\r
 143 \r
 144                 protected override void LoadViewState(object savedState)\r
 145                 {\r
 146                         if(savedState != null)\r
 147                         {\r
 148                                 base.LoadViewState(savedState);\r
 149                                 object o = ViewState["Text"];\r
 150                                 if(o!=null)\r
 151                                         Text = (string)o;\r
 152                         }\r
 153                 }\r
 154 \r
 155                 protected override void RenderContents(HtmlTextWriter writer)\r
 156                 {\r
 157                         if(ImageUrl.Length > 0)\r
 158                         {\r
 159                                 Image img = new Image();\r
 160                                 img.ImageUrl = ResolveUrl(ImageUrl);\r
 161                                 if(ToolTip.Length > 0)\r
 162                                         img.ToolTip = ToolTip;\r
 163                                 if(Text.Length > 0)\r
 164                                         img.AlternateText = Text;\r
 165                                 img.RenderControl(writer);\r
 166                                 return;\r
 167                         }\r
 168                         if(HasControls())\r
 169                         {\r
 170                                 base.RenderContents(writer);\r
 171                                 return;\r
 172                         }\r
 173                         writer.Write(Text);\r
 174                 }\r
 175         }\r
 176 }\r