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                         } else {
  76                                 w.AddAttribute (HtmlTextWriterAttribute.Href, Page.ClientScript.GetPostBackClientHyperlink (this, ""));
  77                         }
  78                 }
  79
  80 #if NET_2_0
  81                 [MonoTODO]
  82                 protected virtual void RaisePostBackEvent (string eventArgument)
  83                 {
  84                         throw new NotImplementedException ();
  85                 }
  86 #endif
  87
  88                 void IPostBackEventHandler.RaisePostBackEvent (string ea)
  89                 {
  90                         if (CausesValidation)
  91 #if NET_2_0
  92                                 Page.Validate (ValidationGroup);
  93 #else
  94                                 Page.Validate ();
  95 #endif
  96
  97                         OnClick (EventArgs.Empty);
  98                         OnCommand (new CommandEventArgs (CommandName, CommandArgument));
  99                 }
 100
 101                 protected override void AddParsedSubObject (object obj)
 102                 {
 103                         if (HasControls ()) {
 104                                 base.AddParsedSubObject (obj);
 105                                 return;
 106                         }
 107
 108                         LiteralControl lc = obj as LiteralControl;
 109
 110                         if (lc == null) {
 111                                 string s = Text;
 112                                 if (s.Length != 0) {
 113                                         Text = null;
 114                                         Controls.Add (new LiteralControl (s));
 115                                 }
 116                                 base.AddParsedSubObject (obj);
 117                         } else {
 118                                 Text = lc.Text;
 119                         }
 120                 }
 121
 122 #if NET_2_0
 123                 protected virtual PostBackOptions GetPostBackOptions ()
 124                 {
 125                         return new PostBackOptions(this, PostBackUrl, null, false, true,
 126                                                    false, true, CausesValidation,
 127                                                    ValidationGroup);
 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 #endif
 194                 public string CommandArgument {
 195                         get {
 196                                 return ViewState.GetString ("CommandArgument", "");
 197                         }
 198                         set {
 199                                 ViewState ["CommandArgument"] = value;
 200                         }
 201                 }
 202
 203                 [DefaultValue("")]
 204                 [WebSysDescription ("")]
 205                 [WebCategory ("Behavior")]
 206 #if NET_2_0
 207                 [Themeable (false)]
 208 #endif
 209                 public string CommandName {
 210                         get {
 211                                 return ViewState.GetString ("CommandName", "");
 212                         }
 213
 214                         set {
 215                                 ViewState ["CommandName"] = value;
 216                         }
 217
 218                 }
 219
 220 #if NET_2_0
 221                 [DefaultValue ("")]
 222                 [Themeable (false)]
 223                 [MonoTODO]
 224                 [WebSysDescription ("")]
 225                 [WebCategoryAttribute ("Behavior")]
 226                 public virtual string OnClientClick
 227                 {
 228                         get {
 229                                 throw new NotImplementedException ();
 230                         }
 231                         set {
 232                                 throw new NotImplementedException ();
 233                         }
 234                 }
 235
 236 #endif
 237
 238                 [Bindable(true)]
 239                 [DefaultValue("")]
 240                 [PersistenceMode(PersistenceMode.InnerDefaultProperty)]
 241 #if NET_2_0
 242                 [Localizable (true)]
 243 #endif
 244                 [WebSysDescription ("")]
 245                 [WebCategory ("Appearance")]
 246                 public virtual string Text {
 247                         get {
 248                                 return ViewState.GetString ("Text", "");
 249                         }
 250                         set {
 251                                 ViewState ["Text"] = value;
 252                                 if (HasControls ())
 253                                         Controls.Clear ();
 254                         }
 255                 }
 256
 257                 protected virtual void OnClick (EventArgs e)
 258                 {
 259                         EventHandler h = (EventHandler) Events [ClickEvent];
 260                         if (h != null)
 261                                 h (this, e);
 262                 }
 263                 static readonly object ClickEvent = new object ();
 264
 265                 [WebSysDescription ("")]
 266                 [WebCategory ("Action")]
 267                 public event EventHandler Click {
 268                         add { Events.AddHandler (ClickEvent, value); }
 269                         remove { Events.RemoveHandler (ClickEvent, value); }
 270                 }
 271
 272                 protected virtual void OnCommand (CommandEventArgs e)
 273                 {
 274                         CommandEventHandler h = (CommandEventHandler) Events [CommandEvent];
 275                         if (h != null)
 276                                 h (this, e);
 277
 278                         RaiseBubbleEvent (this, e);
 279                 }
 280                 static readonly object CommandEvent = new object ();
 281
 282                 [WebSysDescription ("")]
 283                 [WebCategory ("Action")]
 284                 public event CommandEventHandler Command {
 285                         add { Events.AddHandler (CommandEvent, value); }
 286                         remove { Events.RemoveHandler (CommandEvent, value); }
 287                 }
 288 #if NET_2_0
 289                 [Editor ("System.Web.UI.Design.UrlEditor, " + Consts.AssemblySystem_Design, "System.Drawing.Design.UITypeEditor, " + Consts.AssemblySystem_Drawing)]
 290                 [Themeable (false)]
 291                 [UrlProperty ("*.aspx")]
 292                 [DefaultValue ("")]
 293                 public virtual string PostBackUrl {
 294                         get {
 295                                 return ViewState.GetString ("PostBackUrl", String.Empty);
 296                         }
 297                         set {
 298                                 ViewState["PostBackUrl"] = value;
 299                         }
 300                 }
 301
 302                 [DefaultValue ("")]
 303                 [Themeable (false)]
 304                 [WebSysDescription ("")]
 305                 [WebCategoryAttribute ("Behavior")]
 306                 public virtual string ValidationGroup {
 307                         get {
 308                                 return ViewState.GetString ("ValidationGroup", "");
 309                         }
 310                         set {
 311                                 ViewState ["ValidationGroup"] = value;
 312                         }
 313                 }
 314 #endif
 315         }
 316 }
 317