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

   1 //\r
   2 // System.Web.UI.HtmlControls.HtmlControl.cs\r
   3 //\r
   4 // Author\r
   5 //   Bob Smith <bob@thestuff.net>\r
   6 //\r
   7 //\r
   8 // (C) Bob Smith\r
   9 //\r
  10 \r
  11 using System;\r
  12 using System.ComponentModel;
  13 using System.ComponentModel.Design;\r
  14 using System.Globalization;\r
  15 using System.Web;\r
  16 using System.Web.UI;\r
  17 \r
  18 namespace System.Web.UI.HtmlControls{\r
  19         \r
  20         [ToolboxItem(false)]
  21         [Designer ("System.Web.UI.Design.HtmlIntrinsicControlDesigner, " + Consts.AssemblySystem_Design, typeof (IDesigner))]\r
  22         public abstract class HtmlControl : Control, IAttributeAccessor\r
  23         {\r
  24                 internal string _tagName;\r
  25                 private AttributeCollection _attributes;\r
  26
  27                 \r
  28                 public HtmlControl() : this ("span") {}\r
  29                 \r
  30                 public HtmlControl(string tag)\r
  31                 {\r
  32                         _tagName = tag;\r
  33                 }\r
  34                 \r
  35                 protected override ControlCollection CreateControlCollection ()\r
  36                 {\r
  37                         return new EmptyControlCollection (this);\r
  38                 }\r
  39 \r
  40                 internal static string AttributeToString(int n){\r
  41                         if (n != -1)return n.ToString(NumberFormatInfo.InvariantInfo);\r
  42                         return null;\r
  43                 }\r
  44                 \r
  45                 internal static string AttributeToString(string s){\r
  46                         if (s != null && s.Length != 0) return s;\r
  47                         return null;\r
  48                 }\r
  49                 \r
  50                 internal void PreProcessRelativeReference(HtmlTextWriter writer, string attribName){\r
  51                         string attr = Attributes[attribName];\r
  52                         if (attr != null){\r
  53                                 if (attr.Length != 0){\r
  54                                         try{\r
  55                                                 attr = ResolveUrl(attr);\r
  56                                         }\r
  57                                         catch (Exception) {\r
  58                                                 throw new HttpException(attribName + " property had malformed url");\r
  59                                         }\r
  60                                         writer.WriteAttribute(attribName, attr);\r
  61                                         Attributes.Remove(attribName);\r
  62                                 }\r
  63                         }\r
  64                 }\r
  65                 \r
  66                 string System.Web.UI.IAttributeAccessor.GetAttribute(string name){\r
  67                         return Attributes[name];\r
  68                 }\r
  69                 \r
  70                 void System.Web.UI.IAttributeAccessor.SetAttribute(string name, string value){\r
  71                         Attributes[name] = value;\r
  72                 }\r
  73                 \r
  74                 protected virtual void RenderBeginTag (HtmlTextWriter writer)\r
  75                 {\r
  76                         writer.WriteBeginTag (TagName);\r
  77                         RenderAttributes (writer);\r
  78                         writer.Write ('>');\r
  79                 }\r
  80 \r
  81                 protected override void Render (HtmlTextWriter writer)\r
  82                 {\r
  83                         RenderBeginTag (writer);\r
  84                 }\r
  85                 \r
  86                 protected virtual void RenderAttributes(HtmlTextWriter writer){\r
  87                         if (ID != null){\r
  88                                 writer.WriteAttribute("id",ClientID);\r
  89                         }\r
  90                         Attributes.Render(writer);\r
  91                 }\r
  92                 \r
  93                 [Browsable(false)]\r
  94                 [DesignerSerializationVisibility (DesignerSerializationVisibility.Hidden)]\r
  95                 public AttributeCollection Attributes\r
  96                 {\r
  97                         get { \r
  98                                 if (_attributes == null)\r
  99                                         _attributes = new AttributeCollection (ViewState);\r
 100                                 return _attributes;\r
 101                         }\r
 102                 }\r
 103 \r
 104                 [DefaultValue("")]\r
 105                 [DesignerSerializationVisibility (DesignerSerializationVisibility.Hidden)]\r
 106                 [WebCategory("Behavior")]\r
 107                 public bool Disabled\r
 108                 {\r
 109                         get {
 110                                 string disableAttr = Attributes["disabled"] as string;
 111                                 return (disableAttr != null);
 112                         }\r
 113                         set {
 114                                 if (!value)
 115                                         Attributes.Remove ("disabled");
 116                                 else
 117                                         Attributes["disabled"] = "disabled";
 118                         }\r
 119                 }\r
 120 \r
 121                 [Browsable(false)]\r
 122                 [DesignerSerializationVisibility (DesignerSerializationVisibility.Hidden)]\r
 123                 public CssStyleCollection Style\r
 124                 {\r
 125                         get { return Attributes.CssStyle; }\r
 126                 }\r
 127 \r
 128                 [DefaultValue("")]\r
 129                 [DesignerSerializationVisibility (DesignerSerializationVisibility.Hidden)]\r
 130                 [WebCategory("Appearance")]\r
 131                 public virtual string TagName\r
 132                 {\r
 133                         get { return _tagName; }\r
 134                 }\r
 135 \r
 136                 protected override bool ViewStateIgnoresCase \r
 137                 {\r
 138                         get {\r
 139                                 return true;\r
 140                         }\r
 141                 }\r
 142         }\r
 143 }\r