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// NotifyCollections.cs
// John Sohn (jsohn@columbus.rr.com)
//
// Copyright (c) 2002 John Sohn
//
// This file is part of Monodoc, a multilingual API documentation tool.
//
// Monodoc is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 2 of the License, or
// (at your option) any later version.
//
// Monodoc is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Monodoc; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 US
using System;
using System.Collections;
namespace Mono.Doc.Core
{
public delegate void CollectionModifiedEventHandler(object sender);
public interface INotifyCollection
{
event CollectionModifiedEventHandler Modified;
void BeginUpdate();
void EndUpdate();
void SetModifiedEvent();
}
public class NotifyCollectionHandler
{
private bool callModifiedEvent = true;
private bool changedDuringUpdate = false;
INotifyCollection collection;
public NotifyCollectionHandler(INotifyCollection collection)
{
this.collection = collection;
}
public void BeginUpdate()
{
callModifiedEvent = false;
changedDuringUpdate = false;
}
public void EndUpdate()
{
// call the event if changes occured between the
// begin/end update calls
if (changedDuringUpdate)
{
collection.SetModifiedEvent();
}
changedDuringUpdate = false;
callModifiedEvent = true;
}
public void OnModified()
{
// if in the middle of begin/end update
// save the event call until EndUpdate()
if (!callModifiedEvent)
{
changedDuringUpdate = true;
}
else
{
collection.SetModifiedEvent();
}
}
}
}
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