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

   1 //
   2 // System.Web.UI.WebControls.Literal.cs
   3 //
   4 // Authors:
   5 //      Jackson Harper (jackson@ximian.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.Collections;
  30 using System.ComponentModel;
  31 using System.Drawing;
  32 using System.Globalization;
  33 using System.Collections.Specialized;
  34 using System.Security.Permissions;
  35 using System.Web.Util;
  36
  37 namespace System.Web.UI.WebControls {
  38
  39         // CAS
  40         [AspNetHostingPermissionAttribute (SecurityAction.LinkDemand, Level = AspNetHostingPermissionLevel.Minimal)]
  41         [AspNetHostingPermissionAttribute (SecurityAction.InheritanceDemand, Level = AspNetHostingPermissionLevel.Minimal)]
  42         // attributes
  43         [ValidationProperty("SelectedItem")]
  44         [SupportsEventValidation]
  45         public class ListBox : ListControl, IPostBackDataHandler {
  46
  47                 public ListBox ()
  48                 {
  49                 }
  50
  51                 [Browsable(false)]
  52 #if HAVE_CONTROL_ADAPTERS
  53                 public virtual new
  54 #else
  55                 public override
  56 #endif
  57                 Color BorderColor {
  58                         get { return base.BorderColor; }
  59                         set { base.BorderColor = value; }
  60                 }
  61
  62                 [Browsable(false)]
  63 #if HAVE_CONTROL_ADAPTERS
  64                 public virtual new
  65 #else
  66                 public override
  67 #endif
  68                 BorderStyle BorderStyle {
  69                         get { return base.BorderStyle; }
  70                         set { base.BorderStyle = value; }
  71                 }
  72
  73                 [Browsable(false)]
  74 #if HAVE_CONTROL_ADAPTERS
  75                 public virtual new
  76 #else
  77                 public override
  78 #endif
  79                 Unit BorderWidth {
  80                         get { return base.BorderWidth; }
  81                         set { base.BorderWidth = value; }
  82                 }
  83
  84                 [DefaultValue(4)]
  85                 [WebSysDescription ("")]
  86                 [WebCategory ("Appearance")]
  87                 public virtual int Rows {
  88                         get {
  89                                 return ViewState.GetInt ("Rows", 4);
  90                         }
  91                         set {
  92                                 if (value < 1 || value > 2000)
  93                                         throw new ArgumentOutOfRangeException ("value");
  94                                 ViewState ["Rows"] = value;
  95                         }
  96                 }
  97
  98                 [DefaultValue(ListSelectionMode.Single)]
  99                 [WebSysDescription ("")]
 100                 [WebCategory ("Behavior")]
 101                 public virtual ListSelectionMode SelectionMode {
 102                         get {
 103                                 return (ListSelectionMode) ViewState.GetInt ("SelectionMode",
 104                                                 (int) ListSelectionMode.Single);
 105                         }
 106                         set {
 107                                 if (!Enum.IsDefined (typeof (ListSelectionMode), value))
 108                                         throw new ArgumentOutOfRangeException ("value");
 109                                 ViewState ["SelectionMode"] = value;
 110                         }
 111                 }
 112
 113
 114                 public virtual int[] GetSelectedIndices ()
 115                 {
 116                         return (int []) GetSelectedIndicesInternal ().ToArray (typeof (int));
 117                 }
 118
 119                 protected override void AddAttributesToRender (HtmlTextWriter writer)
 120                 {
 121                         if (Page != null)
 122                                 Page.VerifyRenderingInServerForm (this);
 123
 124                         if (ID != null)
 125                                 writer.AddAttribute (HtmlTextWriterAttribute.Name, UniqueID);
 126
 127                         if (AutoPostBack) {
 128                                 string onchange = Page.ClientScript.GetPostBackEventReference (GetPostBackOptions (), true);
 129                                 onchange = String.Concat ("setTimeout('", onchange.Replace ("\\", "\\\\").Replace ("'", "\\'"), "', 0)");
 130                                 writer.AddAttribute (HtmlTextWriterAttribute.Onchange, BuildScriptAttribute ("onchange", onchange));
 131                         }
 132
 133                         if (SelectionMode == ListSelectionMode.Multiple)
 134                                 writer.AddAttribute (HtmlTextWriterAttribute.Multiple,
 135                                                 "multiple", false);
 136                         writer.AddAttribute (HtmlTextWriterAttribute.Size,
 137                                         Rows.ToString (Helpers.InvariantCulture));
 138
 139                         base.AddAttributesToRender (writer);
 140                 }
 141
 142                 PostBackOptions GetPostBackOptions () {
 143                         PostBackOptions options = new PostBackOptions (this);
 144                         options.ActionUrl = null;
 145                         options.ValidationGroup = null;
 146                         options.Argument = String.Empty;
 147                         options.RequiresJavaScriptProtocol = false;
 148                         options.ClientSubmit = true;
 149                         options.PerformValidation = CausesValidation && Page != null && Page.AreValidatorsUplevel (ValidationGroup);
 150                         if (options.PerformValidation)
 151                                 options.ValidationGroup = ValidationGroup;
 152
 153                         return options;
 154                 }
 155
 156
 157                 protected internal
 158                 override void OnPreRender (EventArgs e)
 159                 {
 160                         base.OnPreRender (e);
 161                         Page page = Page;
 162                         if (page != null && IsEnabled)
 163                                 page.RegisterRequiresPostBack (this);
 164                 }
 165
 166                 protected virtual
 167                 bool LoadPostData (string postDataKey, NameValueCollection postCollection)
 168                 {
 169                         EnsureDataBound ();
 170                         string [] values = postCollection.GetValues (postDataKey);
 171                         if (values == null || values.Length == 0) {
 172                                 int prev_index = SelectedIndex;
 173                                 SelectedIndex = -1;
 174                                 return (prev_index != -1);
 175                         }
 176                         ValidateEvent (UniqueID, values [0]);
 177
 178                         if (SelectionMode == ListSelectionMode.Single)
 179                                 return SelectSingle (values);
 180                         return SelectMultiple (values);
 181                 }
 182
 183                 bool SelectSingle (string [] values)
 184                 {
 185                         string val = values [0];
 186                         int idx = Items.IndexOf (val);
 187                         int prev_index = SelectedIndex;
 188                         if (idx != prev_index) {
 189                                 // This will set both the index value and the item.Selected property
 190                                 SelectedIndex = idx;
 191                                 return true;
 192                         }
 193                         return false;
 194                 }
 195
 196                 bool SelectMultiple (string [] values)
 197                 {
 198                         ArrayList prev_selected = GetSelectedIndicesInternal ();
 199                         ClearSelection ();
 200                         foreach (string val in values) {
 201                                 ListItem item = Items.FindByValue (val);
 202                                 if (item != null)
 203                                         item.Selected = true;
 204                         }
 205
 206                         ArrayList new_selection = GetSelectedIndicesInternal ();
 207                         int i = prev_selected.Count;
 208                         if (new_selection.Count != i)
 209                                 return true;
 210
 211                         while (--i >= 0) {
 212                                 if ((int) prev_selected [i] != (int) new_selection [i])
 213                                         return true;
 214                         }
 215
 216                         return false;
 217                 }
 218
 219                 protected virtual
 220                 void RaisePostDataChangedEvent ()
 221                 {
 222                         if (CausesValidation)
 223                                 Page.Validate (ValidationGroup);
 224                         OnSelectedIndexChanged (EventArgs.Empty);
 225                 }
 226
 227                 bool IPostBackDataHandler.LoadPostData (string postDataKey,
 228                                                         NameValueCollection postCollection)
 229                 {
 230                         return LoadPostData (postDataKey, postCollection);
 231                 }
 232
 233                 void IPostBackDataHandler.RaisePostDataChangedEvent ()
 234                 {
 235                         RaisePostDataChangedEvent ();
 236                 }
 237                 internal override bool MultiSelectOk ()
 238                 {
 239                         return this.SelectionMode == ListSelectionMode.Multiple;
 240                 }
 241         }
 242 }
 243
 244
 245