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//
// AsyncPostBackTrigger.cs
//
// Author:
// Igor Zelmanovich <igorz@mainsoft.com>
//
// (C) 2007 Mainsoft, Inc. http://www.mainsoft.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;
using System.Collections.Generic;
using System.Text;
using System.ComponentModel;
using System.Reflection;
namespace System.Web.UI
{
public class AsyncPostBackTrigger : UpdatePanelControlTrigger
{
static readonly MethodInfo _eventHandler = typeof (AsyncPostBackTrigger).GetMethod ("OnEvent");
static readonly char[] _controlIdSeparators = {'_', '$'};
string _eventName;
public new string ControlID {
get {
return base.ControlID;
}
set {
base.ControlID = value;
}
}
[DefaultValue ("")]
[Category ("Behavior")]
public string EventName {
get {
if (_eventName == null)
return String.Empty;
return _eventName;
}
set {
_eventName = value;
}
}
protected internal override bool HasTriggered ()
{
Control ctrl = FindTargetControl (true);
string ctrlUniqueID = ctrl != null ? ctrl.UniqueID : null;
if (ctrlUniqueID == null)
return false;
string asyncPostBackElementID = Owner.ScriptManager.AsyncPostBackSourceElementID;
if (String.Compare (asyncPostBackElementID, ctrlUniqueID, StringComparison.Ordinal) == 0)
return true;
else {
int sep = asyncPostBackElementID.IndexOfAny (_controlIdSeparators);
if (sep > -1 && String.Compare (asyncPostBackElementID, 0, ctrlUniqueID, 0, ctrlUniqueID.Length, StringComparison.Ordinal) == 0)
return true;
}
return false;
}
protected internal override void Initialize ()
{
Control c = FindTargetControl (true);
ScriptManager sm = Owner.ScriptManager;
string eventName = EventName;
if (String.IsNullOrEmpty (eventName)) {
object[] attrs = c.GetType ().GetCustomAttributes (typeof (DefaultEventAttribute), true);
if (attrs != null && attrs.Length > 0) {
var dea = attrs [0] as DefaultEventAttribute;
if (dea != null)
eventName = dea.Name;
}
}
if (!String.IsNullOrEmpty (eventName)) {
EventInfo evi = c.GetType ().GetEvent (eventName, BindingFlags.Instance | BindingFlags.Public | BindingFlags.IgnoreCase);
if (evi == null)
throw new InvalidOperationException (String.Format ("Could not find an event named '{0}' on associated control '{1}' for the trigger in UpdatePanel '{2}'.", eventName, c.ID, Owner.ID));
Delegate d = null;
try {
d = Delegate.CreateDelegate (evi.EventHandlerType, this, _eventHandler);
}
catch (ArgumentException) {
throw new InvalidOperationException (String.Format ("The event '{0}' in '{1}' for the control '{2}' does not match a standard event handler signature.", eventName, c.GetType (), c.ID));
}
evi.AddEventHandler (c, d);
}
sm.RegisterAsyncPostBackControl (c);
}
public void OnEvent (object sender, EventArgs e)
{
UpdatePanel owner = Owner;
if (owner != null && owner.UpdateMode != UpdatePanelUpdateMode.Always)
owner.Update ();
}
public override string ToString () {
return String.Format ("AsyncPostBackTrigger: {0}.{1}", ControlID, EventName);
}
}
}
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