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

   1 //
   2 // System.Web.UI.WebControls.HyperLink.cs
   3 //
   4 // Authors:
   5 //   Gaurav Vaish (gvaish@iitk.ac.in)
   6 //   Gonzalo Paniagua Javier (gonzalo@ximian.com)
   7 //   Andreas Nahr (ClassDevelopment@A-SoftTech.com)
   8 //
   9 // (c) 2002 Ximian, Inc. (http://www.ximian.com)
  10 // (C) Gaurav Vaish (2002)
  11 // (C) 2003 Andreas Nahr
  12 //\r
  13 \r
  14 using System;\r
  15 using System.Web;\r
  16 using System.Web.UI;\r
  17 using System.ComponentModel;
  18 using System.ComponentModel.Design;\r
  19 \r
  20 namespace System.Web.UI.WebControls\r
  21 {\r
  22         [DefaultProperty("Text")]\r
  23         [ControlBuilder(typeof(HyperLinkControlBuilder))]\r
  24         [Designer("System.Web.UI.Design.WebControls.HyperLinkDesigner, " + Consts.AssemblySystem_Design, typeof (IDesigner))]\r
  25         [DataBindingHandler("System.Web.UI.Design.HyperLinkDataBindingHandler, " + Consts.AssemblySystem_Design)]\r
  26         [ParseChildren(false)]\r
  27         [ToolboxData("<{0}:HyperLink runat=\"server\">HyperLink</{0}:HyperLink>")]\r
  28         public class HyperLink: WebControl\r
  29         {\r
  30                 bool textSet;\r
  31 \r
  32                 public HyperLink(): base(HtmlTextWriterTag.A)\r
  33                 {\r
  34                 }\r
  35
  36                 [DefaultValue (""), Bindable (true), WebCategory ("Appearance")]
  37                 [Editor ("System.Web.UI.Design.ImageUrlEditor, " + Consts.AssemblySystem_Design, typeof (System.Drawing.Design.UITypeEditor))]
  38                 [WebSysDescription ("The URL to the image file.")]\r
  39                 public virtual string ImageUrl\r
  40                 {\r
  41                         get\r
  42                         {\r
  43                                 object o = ViewState["ImageUrl"];\r
  44                                 if(o!=null)\r
  45                                         return (string)o;\r
  46                                 return String.Empty;\r
  47                         }\r
  48                         set\r
  49                         {\r
  50                                 ViewState["ImageUrl"] = value;\r
  51                         }\r
  52                 }\r
  53
  54                 [DefaultValue (""), Bindable (true), WebCategory ("Navigation")]
  55                 [Editor ("System.Web.UI.Design.UrlEditor, " + Consts.AssemblySystem_Design, typeof (System.Drawing.Design.UITypeEditor))]
  56                 [WebSysDescription ("The URL to navigate to.")]\r
  57                 public string NavigateUrl\r
  58                 {\r
  59                         get\r
  60                         {\r
  61                                 object o = ViewState["NavigateUrl"];\r
  62                                 if(o!=null)\r
  63                                         return (string)o;\r
  64                                 return String.Empty;\r
  65                         }\r
  66                         set\r
  67                         {\r
  68                                 ViewState["NavigateUrl"] = value;\r
  69                         }\r
  70                 }\r
  71
  72                 [DefaultValue (""), Bindable (true), WebCategory ("Navigation")]
  73                 [TypeConverter (typeof (TargetConverter))]
  74                 [WebSysDescription ("The target frame in which the navigation target should be opened.")]\r
  75                 public string Target\r
  76                 {\r
  77                         get\r
  78                         {\r
  79                                 object o = ViewState["Target"];\r
  80                                 if(o!=null)\r
  81                                         return (string)o;\r
  82                                 return String.Empty;\r
  83                         }\r
  84                         set\r
  85                         {\r
  86                                 ViewState["Target"] = value;\r
  87                         }\r
  88                 }\r
  89
  90                 [DefaultValue (""), Bindable (true), WebCategory ("Appearance")]
  91                 [PersistenceMode (PersistenceMode.InnerDefaultProperty)]
  92                 [WebSysDescription ("The text that should be shown on this HyperLink.")]\r
  93                 public virtual string Text\r
  94                 {\r
  95                         get {\r
  96                                 object o = ViewState ["Text"];\r
  97                                 if (o != null)\r
  98                                         return (string) o;\r
  99 \r
 100                                 return String.Empty;\r
 101                         }\r
 102                         set {\r
 103                                 if (HasControls())\r
 104                                         Controls.Clear();\r
 105                                 ViewState["Text"] = value;\r
 106                                 textSet = true;\r
 107                         }\r
 108                 }\r
 109 \r
 110                 string InternalText\r
 111                 {\r
 112                         get { return Text; }\r
 113                         set { ViewState["Text"] = value; }\r
 114                 }\r
 115 \r
 116                 protected override void AddAttributesToRender(HtmlTextWriter writer)\r
 117                 {\r
 118                         base.AddAttributesToRender(writer);\r
 119                         if(NavigateUrl.Length > 0)\r
 120                         {
 121                                 string url = ResolveUrl (NavigateUrl);
 122                                 writer.AddAttribute(HtmlTextWriterAttribute.Href, url);\r
 123                         }\r
 124                         if(Target.Length > 0)\r
 125                         {\r
 126                                 writer.AddAttribute(HtmlTextWriterAttribute.Target, Target);\r
 127                         }\r
 128                 }\r
 129 \r
 130                 protected override void AddParsedSubObject(object obj)\r
 131                 {\r
 132                         if(HasControls())\r
 133                         {\r
 134                                 base.AddParsedSubObject(obj);\r
 135                                 return;\r
 136                         }\r
 137                         if(obj is LiteralControl)\r
 138                         {\r
 139                                 // This is a hack to workaround the behaviour of the code generator, which\r
 140                                 // may split a text in several LiteralControls if there's a special character\r
 141                                 // such as '<' in it.\r
 142                                 if (textSet) {\r
 143                                         Text = ((LiteralControl)obj).Text;\r
 144                                         textSet = false;\r
 145                                 } else {\r
 146                                         InternalText += ((LiteralControl)obj).Text;\r
 147                                 }\r
 148                                 //\r
 149 \r
 150                                 return;\r
 151                         }\r
 152                         if(Text.Length > 0)\r
 153                         {\r
 154                                 base.AddParsedSubObject(new LiteralControl (Text));\r
 155                                 Text = String.Empty;\r
 156                         }\r
 157                         base.AddParsedSubObject (obj);\r
 158                 }\r
 159 \r
 160                 protected override void LoadViewState(object savedState)\r
 161                 {\r
 162                         if(savedState != null)\r
 163                         {\r
 164                                 base.LoadViewState(savedState);\r
 165                                 object o = ViewState["Text"];\r
 166                                 if(o!=null)\r
 167                                         Text = (string)o;\r
 168                         }\r
 169                 }\r
 170 \r
 171                 protected override void RenderContents(HtmlTextWriter writer)\r
 172                 {\r
 173                         if(ImageUrl.Length > 0)\r
 174                         {\r
 175                                 Image img = new Image();\r
 176                                 img.ImageUrl = ResolveUrl(ImageUrl);\r
 177                                 if(ToolTip.Length > 0)\r
 178                                         img.ToolTip = ToolTip;\r
 179                                 if(Text.Length > 0)\r
 180                                         img.AlternateText = Text;\r
 181                                 img.RenderControl(writer);\r
 182                                 return;\r
 183                         }\r
 184                         if(HasControls())\r
 185                         {\r
 186                                 base.RenderContents(writer);\r
 187                                 return;\r
 188                         }\r
 189                         writer.Write(Text);\r
 190                 }\r
 191         }\r
 192 }\r