HtmlInputCheckBox.cs :  » 2.6.4-mono-.net-core » System.Web » System » Web » UI » HtmlControls » C# / CSharp Open Source

//
// System.Web.UI.HtmlControls.HtmlInputCheckBox.cs
//
// Author:
//  Dick Porter  <dick@ximian.com>
//
// Copyright (C) 2005-2010 Novell, Inc (http://www.novell.com)
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
// 
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//

using System.ComponentModel;
using System.Collections.Specialized;
using System.Security.Permissions;

namespace System.Web.UI.HtmlControls{
  // CAS
  [AspNetHostingPermission (SecurityAction.LinkDemand, Level = AspNetHostingPermissionLevel.Minimal)]
  [AspNetHostingPermission (SecurityAction.InheritanceDemand, Level = AspNetHostingPermissionLevel.Minimal)]
  // attributes
  [DefaultEvent ("ServerChange")]
  [SupportsEventValidation]
  public class HtmlInputCheckBox : HtmlInputControl, IPostBackDataHandler
  {
    static readonly object EventServerChange = new object ();
    
    public HtmlInputCheckBox () : base ("checkbox")
    {
    }

    [DefaultValue ("")]
    [DesignerSerializationVisibility (DesignerSerializationVisibility.Hidden)]
    [WebSysDescription("")]
    [WebCategory("Misc")]
    [TypeConverter (typeof(MinimizableAttributeTypeConverter))]
    public bool Checked {
      get {
        string check = Attributes["checked"];

        if (check == null) {
          return (false);
        }

        return (true);
      }
      set {
        if (value == false) {
          Attributes.Remove ("checked");
        } else {
          Attributes["checked"] = "checked";
        }
      }
    }

    [WebSysDescription("")]
    [WebCategory("Action")]
    public event EventHandler ServerChange {
      add {
        Events.AddHandler (EventServerChange, value);
      }
      remove {
        Events.RemoveHandler (EventServerChange, value);
      }
    }

    protected override void RenderAttributes (HtmlTextWriter writer)
    {
      Page page = Page;
      if (page != null)
        page.ClientScript.RegisterForEventValidation (UniqueID);
      base.RenderAttributes (writer);
    }

    protected internal override void OnPreRender (EventArgs e)
    {
      base.OnPreRender (e);

      Page page = Page;
      if (page != null && !Disabled) {
        page.RegisterRequiresPostBack (this);
        page.RegisterEnabledControl (this);
      }
    }

    protected virtual void OnServerChange (EventArgs e)
    {
      EventHandler handler = (EventHandler)Events[EventServerChange];

      if (handler != null)
        handler (this, e);
    }

    bool LoadPostDataInternal (string postDataKey, NameValueCollection postCollection)
    {
      string postedValue = postCollection[postDataKey];
      bool postedBool = ((postedValue != null) &&
             (postedValue.Length > 0));

      if (Checked != postedBool) {
        Checked = postedBool;
        return (true);
      }
      
      return (false);
    }

    void RaisePostDataChangedEventInternal ()
    {
      OnServerChange (EventArgs.Empty);
    }

    protected virtual bool LoadPostData (string postDataKey, NameValueCollection postCollection)
    {
      return LoadPostDataInternal (postDataKey, postCollection);
    }

    protected virtual void RaisePostDataChangedEvent ()
    {
      ValidateEvent (UniqueID, String.Empty);
      RaisePostDataChangedEventInternal ();
    }
    
    bool IPostBackDataHandler.LoadPostData (string postDataKey, NameValueCollection postCollection)
    {
      return LoadPostData (postDataKey, postCollection);
    }

    void IPostBackDataHandler.RaisePostDataChangedEvent ()
    {
      RaisePostDataChangedEvent();
    }
  }
}