/V4/StockTrader RI/Desktop/StockTraderRI.Infrastructure/Behaviors/DialogActivationBehavior.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.Specialized;

using System.Windows;

using Microsoft.Practices.Prism.Regions;

using Microsoft.Practices.Prism.Regions.Behaviors;



namespace StockTraderRI.Infrastructure.Behaviors

{

    /// <summary>

    /// Defines a behavior that creates a Dialog to display the active view of the target <see cref="IRegion"/>.

    /// </summary>

    public abstract class DialogActivationBehavior : RegionBehavior, IHostAwareRegionBehavior

    {

        /// <summary>

        /// The key of this behavior

        /// </summary>

        public const string BehaviorKey = "DialogActivation";



        private IWindow contentDialog;



        /// <summary>

        /// Gets or sets the <see cref="DependencyObject"/> that the <see cref="IRegion"/> is attached to.

        /// </summary>

        /// <value>A <see cref="DependencyObject"/> that the <see cref="IRegion"/> is attached to.

        /// This is usually a <see cref="FrameworkElement"/> that is part of the tree.</value>

        public DependencyObject HostControl { get; set; }



        /// <summary>

        /// Performs the logic after the behavior has been attached.

        /// </summary>

        protected override void OnAttach()

        {

            this.Region.ActiveViews.CollectionChanged += this.ActiveViews_CollectionChanged;

        }



        /// <summary>

        /// Override this method to create an instance of the <see cref="IWindow"/> that 

        /// will be shown when a view is activated.

        /// </summary>

        /// <returns>

        /// An instance of <see cref="IWindow"/> that will be shown when a 

        /// view is activated on the target <see cref="IRegion"/>.

        /// </returns>

        protected abstract IWindow CreateWindow();



        private void ActiveViews_CollectionChanged(object sender, NotifyCollectionChangedEventArgs e)

        {

            if (e.Action == NotifyCollectionChangedAction.Add)

            {

                this.CloseContentDialog();

                this.PrepareContentDialog(e.NewItems[0]);

            }

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

            {

                this.CloseContentDialog();

            }

        }



        private Style GetStyleForView()

        {

            return this.HostControl.GetValue(RegionPopupBehaviors.ContainerWindowStyleProperty) as Style;

        }



        private void PrepareContentDialog(object view)

        {

            this.contentDialog = this.CreateWindow();

            this.contentDialog.Content = view;

            this.contentDialog.Owner = this.HostControl;

            this.contentDialog.Closed += this.ContentDialogClosed;

            this.contentDialog.Style = this.GetStyleForView();

            this.contentDialog.Show();

        }



        private void CloseContentDialog()

        {

            if (this.contentDialog != null)

            {

                this.contentDialog.Closed -= this.ContentDialogClosed;

                this.contentDialog.Close();

                this.contentDialog.Content = null;

                this.contentDialog.Owner = null;

            }

        }



        private void ContentDialogClosed(object sender, System.EventArgs e)

        {

            this.Region.Deactivate(this.contentDialog.Content);

            this.CloseContentDialog();

        }

    }

}