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 #if NET_2_0
  67                         string onclick = OnClientClick;
  68                         onclick = ClientScriptManager.EnsureEndsWithSemicolon (onclick);
  69                         if (Attributes ["onclick"] != null) {
  70                                 onclick = ClientScriptManager.EnsureEndsWithSemicolon (onclick + Attributes ["onclick"]);
  71                                 Attributes.Remove ("onclick");
  72                         }
  73
  74                         if (onclick.Length > 0)
  75                                 w.AddAttribute (HtmlTextWriterAttribute.Onclick, onclick);
  76
  77                         if (Enabled && Page != null) {
  78                                 PostBackOptions options = GetPostBackOptions ();
  79                                 string href = Page.ClientScript.GetPostBackEventReference (options, true);
  80                                 w.AddAttribute (HtmlTextWriterAttribute.Href, href);
  81                         }
  82                         base.AddAttributesToRender (w);
  83 #else
  84                         base.AddAttributesToRender (w);
  85                         if (Page == null || !Enabled)
  86                                 return;
  87
  88                         if (CausesValidation && Page.AreValidatorsUplevel ()) {
  89                                 ClientScriptManager csm = new ClientScriptManager (Page);
  90                                 w.AddAttribute (HtmlTextWriterAttribute.Href,
  91                                                 String.Format ("javascript:{{if (typeof(Page_ClientValidate) == 'function') Page_ClientValidate(); {0};}}",
  92                                                                csm.GetPostBackEventReference (this, String.Empty)));
  93                         } else {
  94                                 w.AddAttribute (HtmlTextWriterAttribute.Href, Page.ClientScript.GetPostBackClientHyperlink (this, ""));
  95                         }
  96 #endif
  97                 }
  98
  99 #if NET_2_0
 100                 protected virtual
 101 #endif
 102                 void RaisePostBackEvent (string eventArgument)
 103                 {
 104                         if (CausesValidation)
 105 #if NET_2_0
 106                                 Page.Validate (ValidationGroup);
 107 #else
 108                                 Page.Validate ();
 109 #endif
 110
 111                         OnClick (EventArgs.Empty);
 112                         OnCommand (new CommandEventArgs (CommandName, CommandArgument));
 113                 }
 114
 115                 void IPostBackEventHandler.RaisePostBackEvent (string ea)
 116                 {
 117                         RaisePostBackEvent (ea);
 118                 }
 119
 120                 protected override void AddParsedSubObject (object obj)
 121                 {
 122                         if (HasControls ()) {
 123                                 base.AddParsedSubObject (obj);
 124                                 return;
 125                         }
 126
 127                         LiteralControl lc = obj as LiteralControl;
 128
 129                         if (lc == null) {
 130                                 string s = Text;
 131                                 if (s.Length != 0) {
 132                                         Text = null;
 133                                         Controls.Add (new LiteralControl (s));
 134                                 }
 135                                 base.AddParsedSubObject (obj);
 136                         } else {
 137                                 Text = lc.Text;
 138                         }
 139                 }
 140
 141 #if NET_2_0
 142                 protected virtual PostBackOptions GetPostBackOptions ()
 143                 {
 144                         PostBackOptions options = new PostBackOptions (this);
 145                         options.ActionUrl = (PostBackUrl.Length > 0 ? Page.ResolveClientUrl (PostBackUrl) : null);
 146                         options.ValidationGroup = null;
 147                         options.Argument = "";
 148                         options.ClientSubmit = true;
 149                         options.RequiresJavaScriptProtocol = true;
 150                         options.PerformValidation = CausesValidation && Page != null && Page.AreValidatorsUplevel (ValidationGroup);
 151                         if (options.PerformValidation)
 152                                 options.ValidationGroup = ValidationGroup;
 153
 154                         return options;
 155                 }
 156 #endif
 157
 158                 protected override void LoadViewState (object savedState)
 159                 {
 160                         base.LoadViewState (savedState);
 161
 162                         // Make sure we clear child controls when this happens
 163                         if (ViewState ["Text"] != null)
 164                                 Text = (string) ViewState ["Text"];
 165                 }
 166
 167                 [MonoTODO ("Why override?")]
 168 #if NET_2_0
 169                 protected internal
 170 #else
 171                 protected
 172 #endif
 173                 override void OnPreRender (EventArgs e)
 174                 {
 175                         base.OnPreRender (e);
 176                 }
 177
 178 #if NET_2_0
 179                 protected internal
 180 #else
 181                 protected
 182 #endif
 183                 override void RenderContents (HtmlTextWriter writer)
 184                 {
 185                         if (HasControls ())
 186                                 base.RenderContents (writer);
 187                         else
 188                                 writer.Write (Text);
 189                 }
 190
 191
 192 #if ONLY_1_1
 193                 [Bindable(false)]
 194 #endif
 195                 [DefaultValue(true)]
 196                 [WebSysDescription ("")]
 197                 [WebCategory ("Behavior")]
 198 #if NET_2_0
 199                 [Themeable (false)]
 200                 public virtual
 201 #else
 202                 public
 203 #endif
 204                 bool CausesValidation {
 205                         get {
 206                                 return ViewState.GetBool ("CausesValidation", true);
 207                         }
 208                         set {
 209                                 ViewState ["CausesValidation"] = value;
 210                         }
 211
 212                 }
 213
 214                 [Bindable(true)]
 215                 [DefaultValue("")]
 216                 [WebSysDescription ("")]
 217                 [WebCategory ("Behavior")]
 218 #if NET_2_0
 219                 [Themeable (false)]
 220 #endif
 221                 public string CommandArgument {
 222                         get {
 223                                 return ViewState.GetString ("CommandArgument", "");
 224                         }
 225                         set {
 226                                 ViewState ["CommandArgument"] = value;
 227                         }
 228                 }
 229
 230                 [DefaultValue("")]
 231                 [WebSysDescription ("")]
 232                 [WebCategory ("Behavior")]
 233 #if NET_2_0
 234                 [Themeable (false)]
 235 #endif
 236                 public string CommandName {
 237                         get {
 238                                 return ViewState.GetString ("CommandName", "");
 239                         }
 240
 241                         set {
 242                                 ViewState ["CommandName"] = value;
 243                         }
 244
 245                 }
 246
 247 #if NET_2_0
 248                 [DefaultValue ("")]
 249                 [Themeable (false)]
 250                 [WebSysDescription ("")]
 251                 [WebCategoryAttribute ("Behavior")]
 252                 public virtual string OnClientClick
 253                 {
 254                         get {
 255                                 return ViewState.GetString ("OnClientClick", "");
 256                         }
 257                         set {
 258                                 ViewState ["OnClientClick"] = value;
 259                         }
 260                 }
 261
 262 #endif
 263
 264                 [Bindable(true)]
 265                 [DefaultValue("")]
 266                 [PersistenceMode(PersistenceMode.InnerDefaultProperty)]
 267 #if NET_2_0
 268                 [Localizable (true)]
 269 #endif
 270                 [WebSysDescription ("")]
 271                 [WebCategory ("Appearance")]
 272                 public virtual string Text {
 273                         get {
 274                                 return ViewState.GetString ("Text", "");
 275                         }
 276                         set {
 277                                 ViewState ["Text"] = value;
 278                                 if (HasControls ())
 279                                         Controls.Clear ();
 280                         }
 281                 }
 282
 283                 protected virtual void OnClick (EventArgs e)
 284                 {
 285                         EventHandler h = (EventHandler) Events [ClickEvent];
 286                         if (h != null)
 287                                 h (this, e);
 288                 }
 289                 static readonly object ClickEvent = new object ();
 290
 291                 [WebSysDescription ("")]
 292                 [WebCategory ("Action")]
 293                 public event EventHandler Click {
 294                         add { Events.AddHandler (ClickEvent, value); }
 295                         remove { Events.RemoveHandler (ClickEvent, value); }
 296                 }
 297
 298                 protected virtual void OnCommand (CommandEventArgs e)
 299                 {
 300                         CommandEventHandler h = (CommandEventHandler) Events [CommandEvent];
 301                         if (h != null)
 302                                 h (this, e);
 303
 304                         RaiseBubbleEvent (this, e);
 305                 }
 306                 static readonly object CommandEvent = new object ();
 307
 308                 [WebSysDescription ("")]
 309                 [WebCategory ("Action")]
 310                 public event CommandEventHandler Command {
 311                         add { Events.AddHandler (CommandEvent, value); }
 312                         remove { Events.RemoveHandler (CommandEvent, value); }
 313                 }
 314 #if NET_2_0
 315                 [Editor ("System.Web.UI.Design.UrlEditor, " + Consts.AssemblySystem_Design, "System.Drawing.Design.UITypeEditor, " + Consts.AssemblySystem_Drawing)]
 316                 [Themeable (false)]
 317                 [UrlProperty ("*.aspx")]
 318                 [DefaultValue ("")]
 319                 public virtual string PostBackUrl {
 320                         get {
 321                                 return ViewState.GetString ("PostBackUrl", String.Empty);
 322                         }
 323                         set {
 324                                 ViewState["PostBackUrl"] = value;
 325                         }
 326                 }
 327
 328                 [DefaultValue ("")]
 329                 [Themeable (false)]
 330                 [WebSysDescription ("")]
 331                 [WebCategoryAttribute ("Behavior")]
 332                 public virtual string ValidationGroup {
 333                         get {
 334                                 return ViewState.GetString ("ValidationGroup", "");
 335                         }
 336                         set {
 337                                 ViewState ["ValidationGroup"] = value;
 338                         }
 339                 }
 340 #endif
 341         }
 342 }
 343
 344