class/System.Web/System.Web.UI.WebControls/ImageMap.cs

   1 //
   2 // System.Web.UI.WebControls.ImageMap.cs
   3 //
   4 // Authors:
   5 //      Lluis Sanchez Gual (lluis@novell.com)
   6 //
   7 // (C) 2005 Novell, Inc (http://www.novell.com)
   8 //
   9
  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 #if NET_2_0
  32
  33 using System.ComponentModel;
  34 using System.Security.Permissions;
  35
  36 namespace System.Web.UI.WebControls
  37 {
  38         [ParseChildren (true, "HotSpots")]
  39         [DefaultProperty ("HotSpots")]
  40         [DefaultEvent ("Click")]
  41         [AspNetHostingPermissionAttribute (SecurityAction.LinkDemand, Level = AspNetHostingPermissionLevel.Minimal)]
  42         [AspNetHostingPermissionAttribute (SecurityAction.InheritanceDemand, Level = AspNetHostingPermissionLevel.Minimal)]
  43         [SupportsEventValidation]
  44         public class ImageMap: Image, IPostBackEventHandler
  45         {
  46                 HotSpotCollection spots;
  47
  48                 static readonly object ClickEvent = new object();
  49
  50                 [Category ("Action")]
  51                 public event ImageMapEventHandler Click
  52                 {
  53                         add { Events.AddHandler (ClickEvent, value); }
  54                         remove { Events.RemoveHandler (ClickEvent, value); }
  55                 }
  56
  57                 protected virtual void OnClick (ImageMapEventArgs e)
  58                 {
  59                         if (Events != null) {
  60                                 ImageMapEventHandler eh = (ImageMapEventHandler) Events [ClickEvent];
  61                                 if (eh!= null) eh (this, e);
  62                         }
  63                 }
  64
  65                 [DefaultValueAttribute (HotSpotMode.NotSet)]
  66                 public virtual HotSpotMode HotSpotMode {
  67                         get {
  68                                 object o = ViewState ["HotSpotMode"];
  69                                 return o != null ? (HotSpotMode) o : HotSpotMode.NotSet;
  70                         }
  71                         set {
  72                                 ViewState ["HotSpotMode"] = value;
  73                         }
  74                 }
  75
  76                 [DefaultValueAttribute ("")]
  77                 public virtual string Target {
  78                         get {
  79                                 object o = ViewState ["Target"];
  80                                 return o != null ? (string) o : "";
  81                         }
  82                         set {
  83                                 ViewState ["Target"] = value;
  84                         }
  85                 }
  86
  87                 [NotifyParentPropertyAttribute (true)]
  88                 [PersistenceModeAttribute (PersistenceMode.InnerDefaultProperty)]
  89                 [DesignerSerializationVisibilityAttribute (DesignerSerializationVisibility.Content)]
  90                 public HotSpotCollection HotSpots {
  91                         get {
  92                                 if (spots == null) {
  93                                         spots = new HotSpotCollection ();
  94                                         if (IsTrackingViewState)
  95                                                 ((IStateManager)spots).TrackViewState ();
  96                                 }
  97                                 return spots;
  98                         }
  99                 }
 100
 101                 protected override void TrackViewState ()
 102                 {
 103                         base.TrackViewState ();
 104                         if (spots != null) ((IStateManager)spots).TrackViewState ();
 105                 }
 106
 107                 protected override object SaveViewState ()
 108                 {
 109                         object ob1 = base.SaveViewState ();
 110                         object ob2 = spots != null ? ((IStateManager)spots).SaveViewState () : null;
 111
 112                         if (ob1 != null || ob2 != null)
 113                                 return new Pair (ob1, ob2);
 114                         else
 115                                 return null;
 116                 }
 117
 118                 protected override void LoadViewState (object savedState)
 119                 {
 120                         if (savedState == null) {
 121                                 base.LoadViewState (null);
 122                                 return;
 123                         }
 124
 125                         Pair pair = (Pair) savedState;
 126                         base.LoadViewState (pair.First);
 127                         ((IStateManager)HotSpots).LoadViewState (pair.Second);
 128                 }
 129
 130                 public void RaisePostBackEvent (string eventArgument)
 131                 {
 132                         ValidateEvent (UniqueID, eventArgument);
 133                         HotSpot spot = HotSpots [int.Parse (eventArgument)];
 134                         OnClick (new ImageMapEventArgs (spot.PostBackValue));
 135                 }
 136
 137                 protected override void AddAttributesToRender (HtmlTextWriter writer)
 138                 {
 139                         base.AddAttributesToRender (writer);
 140                         if (spots != null && spots.Count > 0)
 141                                 writer.AddAttribute (HtmlTextWriterAttribute.Usemap, "#ImageMap" + ClientID);
 142                 }
 143
 144                 protected internal override void Render (HtmlTextWriter writer)
 145                 {
 146                         base.Render (writer);
 147
 148                         if (spots != null && spots.Count > 0) {
 149                                 writer.AddAttribute (HtmlTextWriterAttribute.Name, "ImageMap" + ClientID);
 150                                 writer.RenderBeginTag (HtmlTextWriterTag.Map);
 151                                 for (int n=0; n<spots.Count; n++) {
 152                                         HotSpot spot = spots [n];
 153                                         writer.AddAttribute (HtmlTextWriterAttribute.Shape, spot.MarkupName);
 154                                         writer.AddAttribute (HtmlTextWriterAttribute.Coords, spot.GetCoordinates ());
 155                                         writer.AddAttribute (HtmlTextWriterAttribute.Title, spot.AlternateText);
 156                                         writer.AddAttribute (HtmlTextWriterAttribute.Alt, spot.AlternateText);
 157                                         if (spot.AccessKey.Length > 0)
 158                                                 writer.AddAttribute (HtmlTextWriterAttribute.Accesskey, spot.AccessKey);
 159                                         if (spot.TabIndex != 0)
 160                                                 writer.AddAttribute (HtmlTextWriterAttribute.Tabindex, spot.TabIndex.ToString ());
 161
 162                                         HotSpotMode mode = spot.HotSpotMode != HotSpotMode.NotSet ? spot.HotSpotMode : HotSpotMode;
 163                                         switch (mode) {
 164                                                 case HotSpotMode.Inactive:
 165                                                         writer.AddAttribute ("nohref", "true", false);
 166                                                         break;
 167                                                 case HotSpotMode.Navigate:
 168                                                         string target = spot.Target.Length > 0 ? spot.Target : Target;
 169                                                         if (!String.IsNullOrEmpty (target))
 170                                                                 writer.AddAttribute (HtmlTextWriterAttribute.Target, target);
 171 #if TARGET_J2EE
 172                                                         string navUrl = ResolveClientUrl (spot.NavigateUrl, String.Compare (target, "_blank", StringComparison.InvariantCultureIgnoreCase) != 0);
 173 #else
 174                                                         string navUrl = ResolveClientUrl (spot.NavigateUrl);
 175 #endif
 176                                                         writer.AddAttribute (HtmlTextWriterAttribute.Href, navUrl);
 177                                                         break;
 178                                                 case HotSpotMode.PostBack:
 179                                                         writer.AddAttribute (HtmlTextWriterAttribute.Href, Page.ClientScript.GetPostBackClientHyperlink (this, n.ToString(), true));
 180                                                         break;
 181                                         }
 182
 183                                         writer.RenderBeginTag (HtmlTextWriterTag.Area);
 184                                         writer.RenderEndTag ();
 185                                 }
 186                                 writer.RenderEndTag ();
 187                         }
 188                 }
 189         }
 190 }
 191
 192 #endif