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// 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.
//
// Copyright (c) 2005-2010 Novell, Inc. (http://www.novell.com)
//
// Authors:
// Peter Bartok (pbartok@novell.com)
//
//
using System.Collections.Specialized;
using System.ComponentModel;
using System.Drawing;
using System.Security.Permissions;
namespace System.Web.UI.WebControls
{
// CAS
[AspNetHostingPermissionAttribute (SecurityAction.LinkDemand, Level = AspNetHostingPermissionLevel.Minimal)]
[AspNetHostingPermissionAttribute (SecurityAction.InheritanceDemand, Level = AspNetHostingPermissionLevel.Minimal)]
// attributes
[ValidationProperty("SelectedItem")]
[SupportsEventValidation]
public class DropDownList : ListControl, IPostBackDataHandler
{
#region Public Constructors
public DropDownList() {
}
#endregion // Public Constructors
#region Public Instance Properties
[Browsable(false)]
public override Color BorderColor {
get { return base.BorderColor; }
set { base.BorderColor = value; }
}
[Browsable(false)]
public override BorderStyle BorderStyle {
get { return base.BorderStyle; }
set { base.BorderStyle = value; }
}
[Browsable(false)]
public override Unit BorderWidth {
get { return base.BorderWidth; }
set { base.BorderWidth = value; }
}
[DefaultValue(0)]
[DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
[WebSysDescription ("")]
[WebCategory ("Misc")]
public override int SelectedIndex {
get {
int selected;
selected = base.SelectedIndex;
if ((selected != -1) || (Items.Count == 0))
return selected;
Items[0].Selected = true;
return 0;
}
set { base.SelectedIndex = value; }
}
public override bool SupportsDisabledAttribute {
get { return RenderingCompatibilityLessThan40; }
}
#endregion // Public Instance Properties
#region Protected Instance Methods
protected override void AddAttributesToRender(HtmlTextWriter writer)
{
Page page = Page;
if (page != null)
page.VerifyRenderingInServerForm (this);
if (writer == null)
return;
if (!String.IsNullOrEmpty (UniqueID))
writer.AddAttribute (HtmlTextWriterAttribute.Name, this.UniqueID, true);
if (!IsEnabled && SelectedIndex == -1)
SelectedIndex = 1;
if (AutoPostBack) {
string onchange = page != null ? page.ClientScript.GetPostBackEventReference (GetPostBackOptions (), true) : String.Empty;
onchange = String.Concat ("setTimeout('", onchange.Replace ("\\", "\\\\").Replace ("'", "\\'"), "', 0)");
writer.AddAttribute (HtmlTextWriterAttribute.Onchange, BuildScriptAttribute ("onchange", onchange));
}
base.AddAttributesToRender(writer);
}
PostBackOptions GetPostBackOptions ()
{
PostBackOptions options = new PostBackOptions (this);
options.ActionUrl = null;
options.ValidationGroup = null;
options.Argument = String.Empty;
options.RequiresJavaScriptProtocol = false;
options.ClientSubmit = true;
Page page = Page;
options.PerformValidation = CausesValidation && page != null && page.AreValidatorsUplevel (ValidationGroup);
if (options.PerformValidation)
options.ValidationGroup = ValidationGroup;
return options;
}
protected override ControlCollection CreateControlCollection ()
{
return base.CreateControlCollection();
}
protected internal override void VerifyMultiSelect ()
{
throw new HttpException ("DropDownList only may have a single selected item");
}
#endregion // Protected Instance Methods
#region Interface Methods
protected virtual bool LoadPostData (string postDataKey, NameValueCollection postCollection)
{
EnsureDataBound ();
int index = Items.IndexOf(postCollection[postDataKey]);
ValidateEvent (postDataKey, postCollection [postDataKey]);
if (index != this.SelectedIndex) {
SelectedIndex = index;
return true;
}
return false;
}
protected virtual void RaisePostDataChangedEvent ()
{
if (CausesValidation) {
Page page = Page;
if (page != null)
page.Validate (ValidationGroup);
}
OnSelectedIndexChanged(EventArgs.Empty);
}
bool IPostBackDataHandler.LoadPostData (string postDataKey, NameValueCollection postCollection)
{
return LoadPostData (postDataKey, postCollection);
}
void IPostBackDataHandler.RaisePostDataChangedEvent ()
{
RaisePostDataChangedEvent ();
}
#endregion // Interface Methods
}
}
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