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

   1 //
   2 // System.Web.UI.WebControls.Image.cs
   3 //
   4 // Authors:
   5 //   Gaurav Vaish (gvaish@iitk.ac.in)
   6 //   Andreas Nahr (ClassDevelopment@A-SoftTech.com)
   7 //
   8 // (C) Gaurav Vaish (2002)
   9 // (C) 2003 Andreas Nahr
  10 //\r
  11
  12 //
  13 // Permission is hereby granted, free of charge, to any person obtaining
  14 // a copy of this software and associated documentation files (the
  15 // "Software"), to deal in the Software without restriction, including
  16 // without limitation the rights to use, copy, modify, merge, publish,
  17 // distribute, sublicense, and/or sell copies of the Software, and to
  18 // permit persons to whom the Software is furnished to do so, subject to
  19 // the following conditions:
  20 //
  21 // The above copyright notice and this permission notice shall be
  22 // included in all copies or substantial portions of the Software.
  23 //
  24 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  25 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  26 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  27 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  28 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  29 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  30 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  31 //
  32 \r
  33 using System;\r
  34 using System.Web;\r
  35 using System.Web.UI;\r
  36 using System.ComponentModel;\r
  37 \r
  38 namespace System.Web.UI.WebControls\r
  39 {\r
  40         [DefaultProperty("ImageUrl")]\r
  41         public class Image : WebControl\r
  42         {\r
  43                 public Image(): base(HtmlTextWriterTag.Img)\r
  44                 {\r
  45                 }\r
  46 \r
  47 #if NET_2_0\r
  48                 [Localizable (true)]\r
  49 #endif
  50                 [DefaultValue (""), Bindable (true), WebCategory ("Appearance")]
  51                 [WebSysDescription ("An alternative text that is shown if the image cannot be displayed.")]\r
  52                 public virtual string AlternateText\r
  53                 {\r
  54                         get\r
  55                         {\r
  56                                 object o = ViewState["AlternateText"];\r
  57                                 if(o!=null)\r
  58                                         return (string)o;\r
  59                                 return String.Empty;\r
  60                         }\r
  61                         set\r
  62                         {\r
  63                                 ViewState["AlternateText"] = value;\r
  64                         }\r
  65                 }\r
  66
  67                 [Browsable (false), EditorBrowsable (EditorBrowsableState.Never)]\r
  68                 public override bool Enabled\r
  69                 {\r
  70                         get\r
  71                         {\r
  72                                 return base.Enabled;\r
  73                         }\r
  74                         set\r
  75                         {\r
  76                                 base.Enabled = value;\r
  77                         }\r
  78                 }\r
  79
  80                 [Browsable (false), EditorBrowsable (EditorBrowsableState.Never)]
  81                 [DesignerSerializationVisibility (DesignerSerializationVisibility.Hidden)]\r
  82                 public override FontInfo Font\r
  83                 {\r
  84                         get\r
  85                         {\r
  86                                 return base.Font;\r
  87                         }\r
  88                 }\r
  89
  90 #if !NET_2_0\r
  91                 [Bindable (true)]\r
  92 #endif\r
  93                 [DefaultValue (typeof (ImageAlign), "NotSet"), WebCategory ("Layout")]
  94                 [WebSysDescription ("The alignment of the image.")]\r
  95                 public virtual ImageAlign ImageAlign\r
  96                 {\r
  97                         get\r
  98                         {\r
  99                                 object o = ViewState["ImageAlign"];\r
 100                                 if(o!=null)\r
 101                                         return (ImageAlign)o;\r
 102                                 return ImageAlign.NotSet;\r
 103                         }\r
 104                         set\r
 105                         {\r
 106                                 ViewState["ImageAlign"] = value;\r
 107                         }\r
 108                 }\r
 109
 110 #if NET_2_0\r
 111                 [Localizable (true)]\r
 112                 [UrlProperty]\r
 113 #endif\r
 114                 [DefaultValue (""), Bindable (true), WebCategory ("Appearance")]
 115                 [Editor ("System.Web.UI.Design.ImageUrlEditor, " + Consts.AssemblySystem_Design, typeof (System.Drawing.Design.UITypeEditor))]
 116                 [WebSysDescription ("The URL to the image file.")]\r
 117                 public virtual string ImageUrl\r
 118                 {\r
 119                         get\r
 120                         {\r
 121                                 object o = ViewState["ImageUrl"];\r
 122                                 if(o!=null)\r
 123                                         return (string)o;\r
 124                                 return String.Empty;\r
 125                         }\r
 126                         set\r
 127                         {\r
 128                                 ViewState["ImageUrl"] = value;\r
 129                         }\r
 130                 }\r
 131                 \r
 132 #if NET_1_1\r
 133                 [WebCategory ("Accessibility")]\r
 134                 [DefaultValueAttribute ("")]\r
 135 #if NET_2_0
 136                 [UrlPropertyAttribute]\r
 137                 [EditorAttribute ("System.Web.UI.Design.UrlEditor, System.Design, Version=2.0.3600.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a", "System.Drawing.Design.UITypeEditor, System.Drawing, Version=2.0.3600.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a")]\r
 138 #endif
 139                 public string DescriptionUrl {\r
 140                         get {\r
 141                                 object o = ViewState["DescriptionUrl"];\r
 142                                 if(o!=null)\r
 143                                         return (string)o;\r
 144                                 return String.Empty;\r
 145                         }\r
 146                         set {\r
 147                                 ViewState["DescriptionUrl"] = value;\r
 148                         }\r
 149                 }\r
 150                 \r
 151                 [DefaultValueAttribute (false)]\r
 152                 [WebCategory ("Accessibility")]\r
 153                 public bool GenerateEmptyAlternateText {\r
 154                         get {\r
 155                                 object o = ViewState["GenerateEmptyAlternateText"];\r
 156                                 if(o!=null)\r
 157                                         return (bool)o;\r
 158                                 return false;\r
 159                         }\r
 160                         set {\r
 161                                 ViewState["GenerateEmptyAlternateText"] = value;\r
 162                         }\r
 163                 }\r
 164                 \r
 165 #endif          \r
 166 \r
 167                 protected override void AddAttributesToRender(HtmlTextWriter writer)\r
 168                 {\r
 169                         base.AddAttributesToRender(writer);\r
 170                         if(ImageUrl.Length > 0)\r
 171                         {\r
 172                                 writer.AddAttribute(HtmlTextWriterAttribute.Src, ResolveUrl(ImageUrl));\r
 173                         }\r
 174 \r
 175 #if NET_1_1\r
 176                         if (DescriptionUrl.Length > 0)\r
 177                                 writer.AddAttribute ("longdesc", DescriptionUrl);\r
 178                                 \r
 179                         if (AlternateText.Length > 0 || GenerateEmptyAlternateText)\r
 180                                 writer.AddAttribute(HtmlTextWriterAttribute.Alt, AlternateText);\r
 181 #else\r
 182                         if (AlternateText.Length > 0)\r
 183                                 writer.AddAttribute(HtmlTextWriterAttribute.Alt, AlternateText);\r
 184 #endif\r
 185                         \r
 186                         if(BorderWidth.IsEmpty)\r
 187                         {\r
 188                                 writer.AddAttribute(HtmlTextWriterAttribute.Border, "0");\r
 189                         }\r
 190                         if(ImageAlign != ImageAlign.NotSet)\r
 191                         {\r
 192                                 writer.AddAttribute(HtmlTextWriterAttribute.Align, Enum.Format(typeof(ImageAlign), ImageAlign, "G"));\r
 193                         }\r
 194                 }\r
 195 \r
 196                 protected override void RenderContents(HtmlTextWriter writer)\r
 197                 {\r
 198                 }\r
 199         }\r
 200 }\r