source: branches/PersistentDataStructures/HeuristicLab.ExtLibs/HeuristicLab.AvalonEdit/5.0.1/AvalonEdit-5.0.1/Utils/DelayedEvents.cs

// Copyright (c) 2014 AlphaSierraPapa for the SharpDevelop Team
// 
// 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;

namespace ICSharpCode.AvalonEdit.Utils
{
  /// <summary>
  /// Maintains a list of delayed events to raise.
  /// </summary>
  sealed class DelayedEvents
  {
    struct EventCall
    {
      EventHandler handler;
      object sender;
      EventArgs e;
      
      public EventCall(EventHandler handler, object sender, EventArgs e)
      {
        this.handler = handler;
        this.sender = sender;
        this.e = e;
      }
      
      public void Call()
      {
        handler(sender, e);
      }
    }
    
    Queue<EventCall> eventCalls = new Queue<EventCall>();
    
    public void DelayedRaise(EventHandler handler, object sender, EventArgs e)
    {
      if (handler != null) {
        eventCalls.Enqueue(new EventCall(handler, sender, e));
      }
    }
    
    public void RaiseEvents()
    {
      while (eventCalls.Count > 0)
        eventCalls.Dequeue().Call();
    }
  }
}