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 //
  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
  33 using System;
  34 using System.Web;
  35 using System.Web.UI;
  36 using System.ComponentModel;
  37
  38 namespace System.Web.UI.WebControls
  39 {
  40         [DefaultProperty("ImageUrl")]
  41         public class Image : WebControl
  42         {
  43                 public Image(): base(HtmlTextWriterTag.Img)
  44                 {
  45                 }
  46
  47                 [DefaultValue (""), Bindable (true), WebCategory ("Appearance")]
  48                 [WebSysDescription ("An alternative text that is shown if the image cannot be displayed.")]
  49                 public virtual string AlternateText
  50                 {
  51                         get
  52                         {
  53                                 object o = ViewState["AlternateText"];
  54                                 if(o!=null)
  55                                         return (string)o;
  56                                 return String.Empty;
  57                         }
  58                         set
  59                         {
  60                                 ViewState["AlternateText"] = value;
  61                         }
  62                 }
  63
  64                 [Browsable (false), EditorBrowsable (EditorBrowsableState.Never)]
  65                 public override bool Enabled
  66                 {
  67                         get
  68                         {
  69                                 return base.Enabled;
  70                         }
  71                         set
  72                         {
  73                                 base.Enabled = value;
  74                         }
  75                 }
  76
  77                 [Browsable (false), EditorBrowsable (EditorBrowsableState.Never)]
  78                 [DesignerSerializationVisibility (DesignerSerializationVisibility.Hidden)]
  79                 public override FontInfo Font
  80                 {
  81                         get
  82                         {
  83                                 return base.Font;
  84                         }
  85                 }
  86
  87                 [DefaultValue (typeof (ImageAlign), "NotSet"), Bindable (true), WebCategory ("Layout")]
  88                 [WebSysDescription ("The alignment of the image.")]
  89                 public virtual ImageAlign ImageAlign
  90                 {
  91                         get
  92                         {
  93                                 object o = ViewState["ImageAlign"];
  94                                 if(o!=null)
  95                                         return (ImageAlign)o;
  96                                 return ImageAlign.NotSet;
  97                         }
  98                         set
  99                         {
 100                                 ViewState["ImageAlign"] = value;
 101                         }
 102                 }
 103
 104                 [DefaultValue (""), Bindable (true), WebCategory ("Appearance")]
 105                 [Editor ("System.Web.UI.Design.ImageUrlEditor, " + Consts.AssemblySystem_Design, typeof (System.Drawing.Design.UITypeEditor))]
 106                 [WebSysDescription ("The URL to the image file.")]
 107                 public virtual string ImageUrl
 108                 {
 109                         get
 110                         {
 111                                 object o = ViewState["ImageUrl"];
 112                                 if(o!=null)
 113                                         return (string)o;
 114                                 return String.Empty;
 115                         }
 116                         set
 117                         {
 118                                 ViewState["ImageUrl"] = value;
 119                         }
 120                 }
 121
 122                 protected override void AddAttributesToRender(HtmlTextWriter writer)
 123                 {
 124                         base.AddAttributesToRender(writer);
 125                         if(ImageUrl.Length > 0)
 126                         {
 127                                 writer.AddAttribute(HtmlTextWriterAttribute.Src, ResolveUrl(ImageUrl));
 128                         }
 129                         if(AlternateText.Length > 0)
 130                         {
 131                                 writer.AddAttribute(HtmlTextWriterAttribute.Alt, AlternateText);
 132                         }
 133                         if(BorderWidth.IsEmpty)
 134                         {
 135                                 writer.AddAttribute(HtmlTextWriterAttribute.Border, "0");
 136                         }
 137                         if(ImageAlign != ImageAlign.NotSet)
 138                         {
 139                                 writer.AddAttribute(HtmlTextWriterAttribute.Align, Enum.Format(typeof(ImageAlign), ImageAlign, "G"));
 140                         }
 141                 }
 142
 143                 protected override void RenderContents(HtmlTextWriter writer)
 144                 {
 145                 }
 146         }
 147 }