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

   1 //
   2 // System.Web.UI.WebControls.LinkButton.cs
   3 //
   4 // Authors:
   5 //      Ben Maurer (bmaurer@novell.com)
   6 //
   7 // (C) 2005 Novell, Inc (http://www.novell.com)
   8 //
   9 // Permission is hereby granted, free of charge, to any person obtaining
  10 // a copy of this software and associated documentation files (the
  11 // "Software"), to deal in the Software without restriction, including
  12 // without limitation the rights to use, copy, modify, merge, publish,
  13 // distribute, sublicense, and/or sell copies of the Software, and to
  14 // permit persons to whom the Software is furnished to do so, subject to
  15 // the following conditions:
  16 //
  17 // The above copyright notice and this permission notice shall be
  18 // included in all copies or substantial portions of the Software.
  19 //
  20 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  21 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  22 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  23 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  24 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  25 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  26 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  27 //
  28
  29 using System.ComponentModel;
  30 using System.Security.Permissions;
  31
  32 namespace System.Web.UI.WebControls {
  33
  34         // CAS
  35         [AspNetHostingPermissionAttribute (SecurityAction.LinkDemand, Level = AspNetHostingPermissionLevel.Minimal)]
  36         [AspNetHostingPermissionAttribute (SecurityAction.InheritanceDemand, Level = AspNetHostingPermissionLevel.Minimal)]
  37         // attributes
  38         [ControlBuilder(typeof(LinkButtonControlBuilder))]
  39         [DataBindingHandler("System.Web.UI.Design.TextDataBindingHandler, " + Consts.AssemblySystem_Design)]
  40         [DefaultEvent("Click")]
  41         [DefaultProperty("Text")]
  42         [Designer("System.Web.UI.Design.WebControls.LinkButtonDesigner, " + Consts.AssemblySystem_Design, "System.ComponentModel.Design.IDesigner")]
  43         [ParseChildren(false)]
  44 #if NET_2_0
  45         [SupportsEventValidation]
  46         [ToolboxData("<{0}:LinkButton runat=\"server\">LinkButton</{0}:LinkButton>")]
  47 #else
  48         [ToolboxData("<{0}:LinkButton runat=server>LinkButton</{0}:LinkButton>")]
  49 #endif
  50         public class LinkButton : WebControl, IPostBackEventHandler
  51 #if NET_2_0
  52         , IButtonControl
  53 #endif
  54         {
  55
  56                 public LinkButton () : base (HtmlTextWriterTag.A)
  57                 {
  58                 }
  59
  60
  61                 protected override void AddAttributesToRender (HtmlTextWriter w)
  62                 {
  63                         if (Page != null)
  64                                 Page.VerifyRenderingInServerForm (this);
  65
  66                         base.AddAttributesToRender (w);
  67                         if (Page == null || !Enabled)
  68                                 return;
  69
  70                         if (CausesValidation && Page.AreValidatorsUplevel ()) {
  71                                 ClientScriptManager csm = new ClientScriptManager (Page);
  72                                 w.AddAttribute (HtmlTextWriterAttribute.Href,
  73                                                 String.Format ("javascript:{{if (typeof(Page_ClientValidate) != 'function' ||  Page_ClientValidate()) {0};}}",
  74                                                                csm.GetPostBackEventReference (this, String.Empty)));
  75                                 w.AddAttribute ("language", "javascript");
  76                         } else {
  77                                 w.AddAttribute (HtmlTextWriterAttribute.Href, Page.ClientScript.GetPostBackClientHyperlink (this, ""));
  78                         }
  79                 }
  80
  81 #if NET_2_0
  82                 [MonoTODO]
  83                 protected virtual void RaisePostBackEvent (string eventArgument)
  84                 {
  85                         throw new NotImplementedException ();
  86                 }
  87 #endif
  88
  89                 void IPostBackEventHandler.RaisePostBackEvent (string ea)
  90                 {
  91                         if (CausesValidation)
  92 #if NET_2_0
  93                                 Page.Validate (ValidationGroup);
  94 #else
  95                                 Page.Validate ();
  96 #endif
  97
  98                         OnClick (EventArgs.Empty);
  99                         OnCommand (new CommandEventArgs (CommandName, CommandArgument));
 100                 }
 101
 102                 protected override void AddParsedSubObject (object obj)
 103                 {
 104                         if (HasControls ()) {
 105                                 base.AddParsedSubObject (obj);
 106                                 return;
 107                         }
 108
 109                         LiteralControl lc = obj as LiteralControl;
 110
 111                         if (lc == null) {
 112                                 string s = Text;
 113                                 if (s.Length != 0) {
 114                                         Text = null;
 115                                         Controls.Add (new LiteralControl (s));
 116                                 }
 117                                 base.AddParsedSubObject (obj);
 118                         } else {
 119                                 Text = lc.Text;
 120                         }
 121                 }
 122
 123 #if NET_2_0
 124                 [MonoTODO]
 125                 protected virtual PostBackOptions GetPostBackOptions ()
 126                 {
 127                         throw new NotImplementedException ();
 128                 }
 129 #endif
 130
 131                 protected override void LoadViewState (object savedState)
 132                 {
 133                         base.LoadViewState (savedState);
 134
 135                         // Make sure we clear child controls when this happens
 136                         if (ViewState ["Text"] != null)
 137                                 Text = (string) ViewState ["Text"];
 138                 }
 139
 140                 [MonoTODO ("Why override?")]
 141 #if NET_2_0
 142                 protected internal
 143 #else
 144                 protected
 145 #endif
 146                 override void OnPreRender (EventArgs e)
 147                 {
 148                         base.OnPreRender (e);
 149                 }
 150
 151 #if NET_2_0
 152                 protected internal
 153 #else
 154                 protected
 155 #endif
 156                 override void RenderContents (HtmlTextWriter writer)
 157                 {
 158                         if (HasControls ())
 159                                 base.RenderContents (writer);
 160                         else
 161                                 writer.Write (Text);
 162                 }
 163
 164
 165 #if ONLY_1_1
 166                 [Bindable(false)]
 167 #endif
 168                 [DefaultValue(true)]
 169                 [WebSysDescription ("")]
 170                 [WebCategory ("Behavior")]
 171 #if NET_2_0
 172                 [Themeable (false)]
 173                 public virtual
 174 #else
 175                 public
 176 #endif
 177                 bool CausesValidation {
 178                         get {
 179                                 return ViewState.GetBool ("CausesValidation", true);
 180                         }
 181                         set {
 182                                 ViewState ["CausesValidation"] = value;
 183                         }
 184
 185                 }
 186
 187                 [Bindable(true)]
 188                 [DefaultValue("")]
 189                 [WebSysDescription ("")]
 190                 [WebCategory ("Behavior")]
 191 #if NET_2_0
 192                 [Themeable (false)]
 193                 public virtual
 194 #else
 195                 public
 196 #endif
 197                 string CommandArgument {
 198                         get {
 199                                 return ViewState.GetString ("CommandArgument", "");
 200                         }
 201                         set {
 202                                 ViewState ["CommandArgument"] = value;
 203                         }
 204                 }
 205
 206                 [DefaultValue("")]
 207                 [WebSysDescription ("")]
 208                 [WebCategory ("Behavior")]
 209 #if NET_2_0
 210                 [Themeable (false)]
 211                 public virtual
 212 #else
 213                 public
 214 #endif
 215                 string CommandName {
 216                         get {
 217                                 return ViewState.GetString ("CommandName", "");
 218                         }
 219
 220                         set {
 221                                 ViewState ["CommandName"] = value;
 222                         }
 223
 224                 }
 225
 226 #if NET_2_0
 227                 [DefaultValue ("")]
 228                 [Themeable (false)]
 229                 [MonoTODO]
 230                 [WebSysDescription ("")]
 231                 [WebCategoryAttribute ("Behavior")]
 232                 public virtual string OnClientClick
 233                 {
 234                         get {
 235                                 throw new NotImplementedException ();
 236                         }
 237                         set {
 238                                 throw new NotImplementedException ();
 239                         }
 240                 }
 241
 242 #endif
 243
 244                 [Bindable(true)]
 245                 [DefaultValue("")]
 246                 [PersistenceMode(PersistenceMode.InnerDefaultProperty)]
 247 #if NET_2_0
 248                 [Localizable (true)]
 249 #endif
 250                 [WebSysDescription ("")]
 251                 [WebCategory ("Appearance")]
 252                 public virtual string Text {
 253                         get {
 254                                 return ViewState.GetString ("Text", "");
 255                         }
 256                         set {
 257                                 ViewState ["Text"] = value;
 258                                 if (HasControls ())
 259                                         Controls.Clear ();
 260                         }
 261                 }
 262
 263                 protected virtual void OnClick (EventArgs e)
 264                 {
 265                         EventHandler h = (EventHandler) Events [ClickEvent];
 266                         if (h != null)
 267                                 h (this, e);
 268                 }
 269                 static readonly object ClickEvent = new object ();
 270
 271                 [WebSysDescription ("")]
 272                 [WebCategory ("Action")]
 273                 public event EventHandler Click {
 274                         add { Events.AddHandler (ClickEvent, value); }
 275                         remove { Events.RemoveHandler (ClickEvent, value); }
 276                 }
 277
 278                 protected virtual void OnCommand (CommandEventArgs e)
 279                 {
 280                         CommandEventHandler h = (CommandEventHandler) Events [CommandEvent];
 281                         if (h != null)
 282                                 h (this, e);
 283
 284                         RaiseBubbleEvent (this, e);
 285                 }
 286                 static readonly object CommandEvent = new object ();
 287
 288                 [WebSysDescription ("")]
 289                 [WebCategory ("Action")]
 290                 public event CommandEventHandler Command {
 291                         add { Events.AddHandler (CommandEvent, value); }
 292                         remove { Events.RemoveHandler (CommandEvent, value); }
 293                 }
 294 #if NET_2_0
 295                 [Editor ("System.Web.UI.Design.UrlEditor, " + Consts.AssemblySystem_Design, "System.Drawing.Design.UITypeEditor, " + Consts.AssemblySystem_Drawing)]
 296                 [Themeable (false)]
 297                 [UrlProperty ("*.aspx")]
 298                 [DefaultValue ("")]
 299                 [MonoTODO]
 300                 public string PostBackUrl {
 301                         get {
 302                                 throw new NotImplementedException ();
 303                         }
 304                         set {
 305                                 throw new NotImplementedException ();
 306                         }
 307                 }
 308
 309                 [DefaultValue ("")]
 310                 [Themeable (false)]
 311                 [WebSysDescription ("")]
 312                 [WebCategoryAttribute ("Behavior")]
 313                 public string ValidationGroup {
 314                         get {
 315                                 return ViewState.GetString ("ValidationGroup", "");
 316                         }
 317                         set {
 318                                 ViewState ["ValidationGroup"] = value;
 319                         }
 320                 }
 321 #endif
 322         }
 323 }
 324