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

   1 //
   2 // System.Web.UI.HtmlControls.HtmlControl.cs
   3 //
   4 // Author
   5 //   Bob Smith <bob@thestuff.net>
   6 //
   7 //
   8 // (C) Bob Smith
   9 // Copyright (C) 2005-2010 Novell, Inc (http://www.novell.com)
  10 //
  11 // Permission is hereby granted, free of charge, to any person obtaining
  12 // a copy of this software and associated documentation files (the
  13 // "Software"), to deal in the Software without restriction, including
  14 // without limitation the rights to use, copy, modify, merge, publish,
  15 // distribute, sublicense, and/or sell copies of the Software, and to
  16 // permit persons to whom the Software is furnished to do so, subject to
  17 // the following conditions:
  18 //
  19 // The above copyright notice and this permission notice shall be
  20 // included in all copies or substantial portions of the Software.
  21 //
  22 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  23 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  24 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  25 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  26 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  27 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  28 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  29 //
  30
  31 using System.ComponentModel;
  32 using System.ComponentModel.Design;
  33 using System.Globalization;
  34 using System.Security.Permissions;
  35
  36 namespace System.Web.UI.HtmlControls{
  37
  38         // CAS
  39         [AspNetHostingPermission (SecurityAction.LinkDemand, Level = AspNetHostingPermissionLevel.Minimal)]
  40         [AspNetHostingPermission (SecurityAction.InheritanceDemand, Level = AspNetHostingPermissionLevel.Minimal)]
  41         // attributes
  42         [ToolboxItem(false)]
  43         [Designer ("System.Web.UI.Design.HtmlIntrinsicControlDesigner, " + Consts.AssemblySystem_Design,
  44                         "System.ComponentModel.Design.IDesigner")]
  45         public abstract class HtmlControl : Control, IAttributeAccessor
  46         {
  47                 internal string _tagName;
  48                 AttributeCollection _attributes;
  49
  50                 protected HtmlControl() : this ("span") {}
  51
  52                 protected HtmlControl(string tag)
  53                 {
  54                         _tagName = tag;
  55                 }
  56
  57                 protected override ControlCollection CreateControlCollection ()
  58                 {
  59                         return new EmptyControlCollection (this);
  60                 }
  61
  62                 internal static string AttributeToString(int n){
  63                         if (n != -1)return n.ToString(NumberFormatInfo.InvariantInfo);
  64                         return null;
  65                 }
  66
  67                 internal static string AttributeToString(string s){
  68                         if (s != null && s.Length != 0) return s;
  69                         return null;
  70                 }
  71
  72                 internal void PreProcessRelativeReference(HtmlTextWriter writer, string attribName){
  73                         string attr = Attributes[attribName];
  74                         if (attr != null){
  75                                 if (attr.Length != 0){
  76                                         try{
  77                                                 attr = ResolveClientUrl(attr);
  78                                         }
  79                                         catch (Exception) {
  80                                                 throw new HttpException(attribName + " property had malformed url");
  81                                         }
  82                                         writer.WriteAttribute(attribName, attr);
  83                                         Attributes.Remove(attribName);
  84                                 }
  85                         }
  86                 }
  87
  88                 /* keep these two methods in sync with the
  89                  * IAttributeAccessor iface methods below */
  90                 protected virtual string GetAttribute (string name)
  91                 {
  92                         return Attributes[name];
  93                 }
  94
  95                 protected virtual void SetAttribute (string name, string value)
  96                 {
  97                         Attributes[name] = value;
  98                 }
  99
 100                 string System.Web.UI.IAttributeAccessor.GetAttribute(string name){
 101                         return Attributes[name];
 102                 }
 103
 104                 void System.Web.UI.IAttributeAccessor.SetAttribute(string name, string value){
 105                         Attributes[name] = value;
 106                 }
 107
 108                 protected virtual void RenderBeginTag (HtmlTextWriter writer)
 109                 {
 110                         writer.WriteBeginTag (TagName);
 111                         RenderAttributes (writer);
 112                         writer.Write ('>');
 113                 }
 114
 115                 protected internal override void Render (HtmlTextWriter writer)
 116                 {
 117                         RenderBeginTag (writer);
 118                 }
 119
 120                 protected virtual void RenderAttributes(HtmlTextWriter writer){
 121                         if (ID != null){
 122                                 writer.WriteAttribute("id",ClientID);
 123                         }
 124                         Attributes.Render(writer);
 125                 }
 126
 127                 [Browsable(false)]
 128                 [DesignerSerializationVisibility (DesignerSerializationVisibility.Hidden)]
 129                 public AttributeCollection Attributes {
 130                         get {
 131                                 if (_attributes == null)
 132                                         _attributes = new AttributeCollection (ViewState);
 133                                 return _attributes;
 134                         }
 135                 }
 136
 137                 [DefaultValue(false)]
 138                 [DesignerSerializationVisibility (DesignerSerializationVisibility.Hidden)]
 139                 [WebSysDescription("")]
 140                 [WebCategory("Behavior")]
 141                 [TypeConverter (typeof(MinimizableAttributeTypeConverter))]
 142                 public bool Disabled {
 143                         get {
 144                                 string disableAttr = Attributes["disabled"] as string;
 145                                 return (disableAttr != null);
 146                         }
 147                         set {
 148                                 if (!value)
 149                                         Attributes.Remove ("disabled");
 150                                 else
 151                                         Attributes["disabled"] = "disabled";
 152                         }
 153                 }
 154
 155                 [Browsable(false)]
 156                 [DesignerSerializationVisibility (DesignerSerializationVisibility.Hidden)]
 157                 public CssStyleCollection Style {
 158                         get { return Attributes.CssStyle; }
 159                 }
 160
 161                 [DefaultValue("")]
 162                 [DesignerSerializationVisibility (DesignerSerializationVisibility.Hidden)]
 163                 [WebSysDescription("")]
 164                 [WebCategory("Appearance")]
 165                 public virtual string TagName {
 166                         get { return _tagName; }
 167                 }
 168
 169                 protected override bool ViewStateIgnoresCase {
 170                         get {
 171                                 return true;
 172                         }
 173                 }
 174         }
 175 }