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

   1 /*      System.Web.UI.HtmlControls
   2 *       Authors
   3 *               Leen Toelen (toelen@hotmail.com)
   4 */
   5
   6 using System;
   7 using System.Collections.Specialized;
   8 using System.ComponentModel;
   9 using System.Globalization;
  10 using System.Web;
  11 using System.Web.UI;
  12
  13 namespace System.Web.UI.HtmlControls{
  14
  15         [DefaultEvent("ServerClick")]
  16         public class HtmlInputImage : HtmlInputControl, IPostBackEventHandler, IPostBackDataHandler{
  17
  18                 private static readonly object EventServerClick = new object ();
  19                 private int _x, _y;
  20
  21                 public HtmlInputImage(): base("image"){}
  22
  23                 protected override void OnPreRender(EventArgs e){
  24                         if (Page != null && !Disabled){
  25                                 Page.RegisterRequiresPostBack(this);
  26                         }
  27                 }
  28
  29                 protected override void RenderAttributes(HtmlTextWriter writer)
  30                 {
  31                         base.RenderAttributes (writer);
  32                         // Anything else?
  33                 }
  34
  35                 protected virtual void OnServerClick(ImageClickEventArgs e){
  36                         ImageClickEventHandler handler = (ImageClickEventHandler) Events[EventServerClick];
  37                         if (handler != null) handler (this, e);
  38                 }
  39
  40                 bool IPostBackDataHandler.LoadPostData (string postDataKey,
  41                                                        NameValueCollection postCollection)
  42                 {
  43                         string postX = postCollection[String.Concat(RenderedName,".x")];
  44                         string postY = postCollection[String.Concat(RenderedName,".y")];
  45                         if (postX != null && postY != null && postX.Length >= 0 && postY.Length >= 0){
  46                                 _x = Int32.Parse(postX, CultureInfo.InvariantCulture);
  47                                 _y = Int32.Parse(postY, CultureInfo.InvariantCulture);
  48                                 Page.RegisterRequiresRaiseEvent(this);
  49                         }
  50                         return false;
  51                 }
  52
  53                 void IPostBackEventHandler.RaisePostBackEvent (string eventArgument)
  54                 {
  55                         if (CausesValidation)
  56                                 Page.Validate();
  57                         OnServerClick (new ImageClickEventArgs(_x, _y));
  58                 }
  59
  60                 void IPostBackDataHandler.RaisePostDataChangedEvent ()
  61                 {
  62                 }
  63
  64                 [WebCategory("Action")]
  65                 [WebSysDescription("Fires when the image is clicked.")]
  66                 public event ImageClickEventHandler ServerClick{
  67                         add{
  68                                 Events.AddHandler(EventServerClick, value);
  69                         }
  70                         remove{
  71                                 Events.RemoveHandler(EventServerClick, value);
  72                         }
  73                 }
  74
  75                 [DefaultValue("")]
  76                 [WebCategory("Appearance")]
  77                 [DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
  78                 public string Align{
  79                         get{
  80                                 string attr = Attributes["align"];
  81                                 if (attr != null) return attr;
  82                                 return String.Empty;
  83                         }
  84                         set{
  85                                 Attributes["align"] = AttributeToString(value);
  86                         }
  87                 }
  88
  89                 [DefaultValue("")]
  90                 [WebCategory("Appearance")]
  91                 [DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
  92                 public string Alt{
  93                         get{
  94                                 string attr = Attributes["alt"];
  95                                 if (attr != null) return attr;
  96                                 return String.Empty;
  97                         }
  98                         set{
  99                                 Attributes["alt"] = AttributeToString(value);
 100                         }
 101                 }
 102
 103                 [DefaultValue("")]
 104                 [WebCategory("Appearance")]
 105                 [DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
 106                 public int Border{
 107                         get{
 108                                 string attr = Attributes["border"];
 109                                 if (attr != null) return Int32.Parse(attr,CultureInfo.InvariantCulture);
 110                                 return -1;
 111                         }
 112                         set{
 113                                 Attributes["border"] = AttributeToString(value);
 114                         }
 115                 }
 116
 117                 [DefaultValue(true)]
 118                 [WebCategory("Behavior")]
 119                 public bool CausesValidation{
 120                         get{
 121                                 object causesVal = ViewState["CausesValidation"];
 122                                 if (causesVal != null) return (Boolean) causesVal;
 123                                 return true;
 124                         }
 125                         set{
 126                                 ViewState["CausesValidation"] = (Boolean) value;
 127                         }
 128                 }
 129
 130                 [DefaultValue("")]
 131                 [WebCategory("Appearance")]
 132                 [DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
 133                 public string Src{
 134                         get{
 135                                 string attr = Attributes["src"];
 136                                 if (attr != null) return attr;
 137                                 return String.Empty;
 138                         }
 139                         set{
 140                                 Attributes["src"] = AttributeToString(value);
 141                         }
 142                 }
 143         } // class HtmlInputImage
 144 } // namespace System.Web.UI.HtmlControls
 145