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 \r
  12 using System;\r
  13 using System.Web;\r
  14 using System.Web.UI;\r
  15 using System.ComponentModel;\r
  16 \r
  17 namespace System.Web.UI.WebControls\r
  18 {\r
  19         [DefaultProperty("ImageUrl")]\r
  20         public class Image : WebControl\r
  21         {\r
  22                 public Image(): base(HtmlTextWriterTag.Img)\r
  23                 {\r
  24                 }\r
  25
  26                 [DefaultValue (""), Bindable (true), WebCategory ("Appearance")]
  27                 [WebSysDescription ("An alternative text that is shown if the image cannot be displayed.")]\r
  28                 public virtual string AlternateText\r
  29                 {\r
  30                         get\r
  31                         {\r
  32                                 object o = ViewState["AlternateText"];\r
  33                                 if(o!=null)\r
  34                                         return (string)o;\r
  35                                 return String.Empty;\r
  36                         }\r
  37                         set\r
  38                         {\r
  39                                 ViewState["AlternateText"] = value;\r
  40                         }\r
  41                 }\r
  42
  43                 [Browsable (false), EditorBrowsable (EditorBrowsableState.Never)]\r
  44                 public override bool Enabled\r
  45                 {\r
  46                         get\r
  47                         {\r
  48                                 return base.Enabled;\r
  49                         }\r
  50                         set\r
  51                         {\r
  52                                 base.Enabled = value;\r
  53                         }\r
  54                 }\r
  55
  56                 [Browsable (false), EditorBrowsable (EditorBrowsableState.Never)]
  57                 [DesignerSerializationVisibility (DesignerSerializationVisibility.Hidden)]\r
  58                 public override FontInfo Font\r
  59                 {\r
  60                         get\r
  61                         {\r
  62                                 return base.Font;\r
  63                         }\r
  64                 }\r
  65
  66                 [DefaultValue (typeof (ImageAlign), "NotSet"), Bindable (true), WebCategory ("Layout")]
  67                 [WebSysDescription ("The alignment of the image.")]\r
  68                 public virtual ImageAlign ImageAlign\r
  69                 {\r
  70                         get\r
  71                         {\r
  72                                 object o = ViewState["ImageAlign"];\r
  73                                 if(o!=null)\r
  74                                         return (ImageAlign)o;\r
  75                                 return ImageAlign.NotSet;\r
  76                         }\r
  77                         set\r
  78                         {\r
  79                                 ViewState["ImageAlign"] = value;\r
  80                         }\r
  81                 }\r
  82
  83                 [DefaultValue (""), Bindable (true), WebCategory ("Appearance")]
  84                 [Editor ("System.Web.UI.Design.ImageUrlEditor, " + Consts.AssemblySystem_Design, typeof (System.Drawing.Design.UITypeEditor))]
  85                 [WebSysDescription ("The URL to the image file.")]\r
  86                 public virtual string ImageUrl\r
  87                 {\r
  88                         get\r
  89                         {\r
  90                                 object o = ViewState["ImageUrl"];\r
  91                                 if(o!=null)\r
  92                                         return (string)o;\r
  93                                 return String.Empty;\r
  94                         }\r
  95                         set\r
  96                         {\r
  97                                 ViewState["ImageUrl"] = value;\r
  98                         }\r
  99                 }\r
 100 \r
 101                 protected override void AddAttributesToRender(HtmlTextWriter writer)\r
 102                 {\r
 103                         base.AddAttributesToRender(writer);\r
 104                         if(ImageUrl.Length > 0)\r
 105                         {\r
 106                                 writer.AddAttribute(HtmlTextWriterAttribute.Src, ResolveUrl(ImageUrl));\r
 107                         }\r
 108                         if(AlternateText.Length > 0)\r
 109                         {\r
 110                                 writer.AddAttribute(HtmlTextWriterAttribute.Alt, AlternateText);\r
 111                         }\r
 112                         if(BorderWidth.IsEmpty)\r
 113                         {\r
 114                                 writer.AddAttribute(HtmlTextWriterAttribute.Border, "0");\r
 115                         }\r
 116                         if(ImageAlign != ImageAlign.NotSet)\r
 117                         {\r
 118                                 writer.AddAttribute(HtmlTextWriterAttribute.Align, Enum.Format(typeof(ImageAlign), ImageAlign, "G"));\r
 119                         }\r
 120                 }\r
 121 \r
 122                 protected override void RenderContents(HtmlTextWriter writer)\r
 123                 {\r
 124                 }\r
 125         }\r
 126 }\r