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/* Copyright (c) 2008, Dr. WPF
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* * The name Dr. WPF may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY Dr. WPF ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL Dr. WPF BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows.Controls;
using System.Windows;
using System.Collections.Specialized;
using System.Windows.Media;
namespace DrWPF.Windows.Controls
{
/// <summary>
/// This panel maintains a collection of conceptual children that are neither logical
/// children nor visual children of the panel. This allows those visuals to be connected
/// to other parts of the UI, if necessary, or even to remain disconnected.
/// </summary>
public abstract class ConceptualPanel : Panel
{
public ConceptualPanel()
{
Loaded += OnLoaded;
}
void OnLoaded(object sender, RoutedEventArgs e)
{
Loaded -= OnLoaded;
(Children as DisconnectedUIElementCollection).Initialize();
}
protected override sealed UIElementCollection CreateUIElementCollection(FrameworkElement logicalParent)
{
DisconnectedUIElementCollection children = new DisconnectedUIElementCollection(this);
children.CollectionChanged += new NotifyCollectionChangedEventHandler(OnChildrenCollectionChanged);
return children;
}
protected virtual void OnChildAdded(UIElement child)
{
}
protected virtual void OnChildRemoved(UIElement child)
{
}
/// <summary>
/// For simplicity, this class will listen to change notifications on the DisconnectedUIElementCollection
/// and provide them to descendants through the OnChildAdded and OnChildRemoved members.
/// </summary>
private void OnChildrenCollectionChanged(object sender, NotifyCollectionChangedEventArgs e)
{
switch (e.Action)
{
case NotifyCollectionChangedAction.Add:
OnChildAdded(e.NewItems[0] as UIElement);
break;
case NotifyCollectionChangedAction.Remove:
OnChildRemoved(e.OldItems[0] as UIElement);
break;
}
}
protected override int VisualChildrenCount
{
get { return _visualChildren.Count; }
}
protected override Visual GetVisualChild(int index)
{
if (index < 0 || index >= _visualChildren.Count)
throw new ArgumentOutOfRangeException();
return _visualChildren[index];
}
protected override void OnVisualChildrenChanged(DependencyObject visualAdded, DependencyObject visualRemoved)
{
if (visualAdded is Visual)
{
_visualChildren.Add(visualAdded as Visual);
}
if (visualRemoved is Visual)
{
_visualChildren.Remove(visualRemoved as Visual);
}
base.OnVisualChildrenChanged(visualAdded, visualRemoved);
}
private readonly List<Visual> _visualChildren = new List<Visual>();
}
}
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