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//===================================================================================
// 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;
using System.Collections.Specialized;
using System.ComponentModel;
using System.Windows;
using Microsoft.Practices.Composite.Regions;
namespace Microsoft.Practices.Composite.Presentation.Regions.Behaviors
{
/// <summary>
/// Defines a behavior that forwards the <see cref="RegionManager.RegionContextProperty"/>
/// to the views in the region.
/// </summary>
public class BindRegionContextToDependencyObjectBehavior : IRegionBehavior
{
/// <summary>
/// The key of this behavior.
/// </summary>
public const string BehaviorKey = "ContextToDependencyObject";
/// <summary>
/// Behavior's attached region.
/// </summary>
public IRegion Region { get; set; }
/// <summary>
/// Attaches the behavior to the specified region.
/// </summary>
public void Attach()
{
this.Region.Views.CollectionChanged += this.Views_CollectionChanged;
this.Region.PropertyChanged += this.Region_PropertyChanged;
SetContextToViews(this.Region.Views, this.Region.Context);
this.AttachNotifyChangeEvent(this.Region.Views);
}
private static void SetContextToViews(IEnumerable views, object context)
{
foreach (var view in views)
{
DependencyObject dependencyObjectView = view as DependencyObject;
if (dependencyObjectView != null)
{
ObservableObject<object> contextWrapper = RegionContext.GetObservableContext(dependencyObjectView);
contextWrapper.Value = context;
}
}
}
private void AttachNotifyChangeEvent(IEnumerable views)
{
foreach (var view in views)
{
var dependencyObject = view as DependencyObject;
if (dependencyObject != null)
{
ObservableObject<object> viewRegionContext = RegionContext.GetObservableContext(dependencyObject);
viewRegionContext.PropertyChanged += this.ViewRegionContext_OnPropertyChangedEvent;
}
}
}
private void DetachNotifyChangeEvent(IEnumerable views)
{
foreach (var view in views)
{
var dependencyObject = view as DependencyObject;
if (dependencyObject != null)
{
ObservableObject<object> viewRegionContext = RegionContext.GetObservableContext(dependencyObject);
viewRegionContext.PropertyChanged -= this.ViewRegionContext_OnPropertyChangedEvent;
}
}
}
private void ViewRegionContext_OnPropertyChangedEvent(object sender, PropertyChangedEventArgs args)
{
if (args.PropertyName == "Value")
{
var context = (ObservableObject<object>) sender;
this.Region.Context = context.Value;
}
}
private void Views_CollectionChanged(object sender, NotifyCollectionChangedEventArgs e)
{
if (e.Action == NotifyCollectionChangedAction.Add)
{
SetContextToViews(e.NewItems, this.Region.Context);
this.AttachNotifyChangeEvent(e.NewItems);
}
else if (e.Action == NotifyCollectionChangedAction.Remove && this.Region.Context != null)
{
SetContextToViews(e.OldItems, null);
this.DetachNotifyChangeEvent(e.OldItems);
}
}
private void Region_PropertyChanged(object sender, PropertyChangedEventArgs e)
{
if (e.PropertyName == "Context")
{
SetContextToViews(this.Region.Views, this.Region.Context);
}
}
}
}
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Daniel is a former senior engineer in Technology and Research at the Office of the CTO at Microsoft, working on next generation systems.
Previously Daniel was a nine-time Microsoft MVP and co-founder of
Outcoder, a Swiss software and consulting company.
Daniel is the author of Windows Phone 8 Unleashed and Windows Phone 7.5 Unleashed, both published by SAMS.
Daniel is the developer behind several acclaimed mobile apps including
Surfy Browser for Android and Windows Phone. Daniel is the creator of a number of popular open-source projects, most notably
Codon.
Would you like Daniel to bring value to your organisation?
Please contact
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