/V4/StockTrader RI/Desktop/StockTraderRI/Controls/ResearchControl.cs

//===================================================================================

// Microsoft patterns & practices

// Composite Application Guidance for Windows Presentation Foundation and Silverlight

//===================================================================================

// Copyright (c) Microsoft Corporation.  All rights reserved.

// THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY

// OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT

// LIMITED TO THE IMPLIED WARRANTIES OF MERCHANTABILITY AND

// FITNESS FOR A PARTICULAR PURPOSE.

//===================================================================================

// The example companies, organizations, products, domain names,

// e-mail addresses, logos, people, places, and events depicted

// herein are fictitious.  No association with any real company,

// organization, product, domain name, email address, logo, person,

// places, or events is intended or should be inferred.

//===================================================================================

using System.Collections.ObjectModel;

using System.Collections.Specialized;

using System.Windows;

using System.Windows.Controls;

using System;



namespace StockTraderRI.Controls

{

    /// <summary>

    /// Custom ItemsControl with Header.

    /// </summary>

    public class ResearchControl : ItemsControl

    {

        public static readonly DependencyProperty HeadersProperty =

            DependencyProperty.Register("Headers", typeof(ObservableCollection<object>), typeof(ResearchControl), null);



        public ResearchControl()

        {

            this.Headers = new ObservableCollection<object>();

        }



        public ObservableCollection<object> Headers

        {

            get { return (ObservableCollection<object>)GetValue(HeadersProperty); }

            private set { SetValue(HeadersProperty, value); }

        }



        protected override void OnItemsChanged(NotifyCollectionChangedEventArgs e)

        {

            if (e == null)

            {

                throw new ArgumentNullException("e");

            }



            base.OnItemsChanged(e);

            if (e.Action == NotifyCollectionChangedAction.Add)

            {

                object newItem = e.NewItems[0];

                DependencyObject header = GetHeader(newItem as FrameworkElement);

                this.Headers.Insert(e.NewStartingIndex, header);

            }

            else if (e.Action == NotifyCollectionChangedAction.Remove)

            {

                this.Headers.RemoveAt(e.OldStartingIndex);

            }

        }



        private static DependencyObject GetHeader(FrameworkElement view)

        {

            if (view != null)

            {

                DataTemplate template = view.Resources["HeaderIcon"] as DataTemplate;

                if (template != null)

                {

                    return template.LoadContent();

                }

            }



            return null;

        }

    }

}