很多应用都需要多窗口支持，例如IM通讯工具，多窗口显示也能够提高的操作的灵活性，这个论据可以参考windows OS，但Silverlight中却没有内置提供多窗口显示支持，我们只能自己开发个“窗口”控件了，其实这样也好，省得还要去掉Windows窗口那些默认的显示效果；开发Silverlight或者WPF的人都喜欢用Prism来作为开发框架（Prism2.2发布了，全面支持Silverlight4 ）；本文讨论的是解决在Prism中使用多窗口的问题。

Prism是靠一堆统一管理的“Region”来动态显示模块界面的：先在需要显示界面的地方放个Region

 <ItemsControl x:Name="MainRegion" Grid.Row="0" VerticalAlignment="Center" Regions:RegionManager.RegionName="MainRegion" Width="400" Height="300"/>

然后在模块文件（继承自IModule）中

this.regionManager.Regions["MainRegion"].Add(view);

这样就可以把指定的模块显示在指定的区域当中了。 Prism提供了三种类型的Region，分别是ContentControl、ItemsControl、Selector，偏偏没有用来显示“多窗口”的，我就找啊找啊，终于在这个项目http://compositewpfcontrib.codeplex.com/ 中找到了一个WPF的WindowRegionAdapter，所以我就依葫芦画瓢，给弄出个Silverlight的WindowRegionAdapter。

代码

 

using System; using System.Net; using System.Windows; using System.Windows.Controls; using System.Windows.Documents; using System.Windows.Ink; using System.Windows.Input; using System.Windows.Media; using System.Windows.Media.Animation; using System.Windows.Shapes; using Microsoft.Practices.Composite.Regions; using Microsoft.Practices.Composite.Presentation.Regions; using System.Collections.Specialized;

 

namespace CompositeTest1.Common.Utilities {     public class SLWindowRegionAdapter : RegionAdapterBase<Grid>     {         public SLWindowRegionAdapter(IRegionBehaviorFactory regionBehaviorFactory)             : base(regionBehaviorFactory)         { }

        protected override void Adapt(IRegion region, Grid regionTarget)         {         }

        protected override IRegion CreateRegion()         {             return new SingleActiveRegion();         }         protected override void AttachBehaviors(IRegion region, Grid regionTarget)         {             base.AttachBehaviors(region, regionTarget);             WindowRegionBehavior behavior = new WindowRegionBehavior(regionTarget, region);             behavior.Attach();         }     }     public class WindowRegionBehavior     {         private readonly WeakReference _ownerWeakReference;         private readonly WeakReference _regionWeakReference;

        public WindowRegionBehavior(Grid owner, IRegion region)         {             _ownerWeakReference = new WeakReference(owner);             _regionWeakReference = new WeakReference(region);         }

        public void Attach()         {             IRegion region = _regionWeakReference.Target as IRegion;             if (region != null)             {                 region.Views.CollectionChanged += new NotifyCollectionChangedEventHandler(Views_CollectionChanged);                 region.ActiveViews.CollectionChanged += new NotifyCollectionChangedEventHandler(ActiveViews_CollectionChanged);             }         }

        public void Detach()         {             IRegion region = _regionWeakReference.Target as IRegion;             if (region != null)             {                 region.Views.CollectionChanged -= Views_CollectionChanged;                 region.ActiveViews.CollectionChanged -= ActiveViews_CollectionChanged;             }         }

        void window_LostFocus(object sender, RoutedEventArgs e)         {             IRegion region = _regionWeakReference.Target as IRegion;             System.Windows.Controls.Window window = sender as System.Windows.Controls.Window;             if (window != null && region != null)                 if (region.Views.Contains(window.Content))                     region.Deactivate(window.Content);         }

        void window_GotFocus(object sender, RoutedEventArgs e)         {             IRegion region = _regionWeakReference.Target as IRegion;             System.Windows.Controls.Window window = sender as System.Windows.Controls.Window;             if (window != null && !region.ActiveViews.Contains(window.Content) && region.Views.Contains(window.Content))                 region.Activate(window.Content);         }         private void window_Closed(object sender, EventArgs e)         {             System.Windows.Controls.Window window = sender as System.Windows.Controls.Window;             IRegion region = _regionWeakReference.Target as IRegion;

            if (window != null && region != null)                 if (region.Views.Contains(window.Content))                     region.Remove(window.Content);              Grid owner = _ownerWeakReference.Target as Grid;              StackPanel spanel = owner.FindName("SLWindow") as StackPanel;              if (spanel != null)              {                  Button btn = spanel.FindName(window.Name.ToString().TrimEnd('M')) as Button;                  spanel.Children.Remove(btn);              }         }

        private void ActiveViews_CollectionChanged(object sender, NotifyCollectionChangedEventArgs e)         {             Grid owner = _ownerWeakReference.Target as Grid;

            if (owner == null)             {                 Detach();                 return;             }

            if (e.Action == NotifyCollectionChangedAction.Add)             {                 foreach (object view in e.NewItems)                 {                     System.Windows.Controls.Window window = GetContainerWindow(owner, view);                     if (window != null)                     {                         window.Focus();                     }                 }             }         }

        private void Views_CollectionChanged(object sender, NotifyCollectionChangedEventArgs e)         {             Grid owner = _ownerWeakReference.Target as Grid;             if (owner == null)             {                 Detach();                 return;             }             if (e.Action == NotifyCollectionChangedAction.Add)             {                 foreach (object view in e.NewItems)                 {                     System.Windows.Controls.Window window = new System.Windows.Controls.Window();                     window.GotFocus += new RoutedEventHandler(window_GotFocus);                     window.LostFocus += new RoutedEventHandler(window_LostFocus);                     window.Closed += new EventHandler(window_Closed);                     window.Content = view;

                                      StackPanel spanel = owner.FindName("SLWindow") as StackPanel;                     if (spanel != null)                     {                         int index = spanel.Children.Count + 1;                         Button btn = new Button() { Name = "Window" + index, Content = "窗口" + index };                         window.Name = "Window" + index+"M";                         window.TitleContent = "窗口" + index;                         btn.Tag = window;                         btn.Click += new RoutedEventHandler(btn_Click);                         spanel.Children.Add(btn);                     }                                         window.Container = owner;                     window.Show(DialogMode.Default);                 }             }             else if (e.Action == NotifyCollectionChangedAction.Remove)             {                 foreach (object view in e.OldItems)                 {                     System.Windows.Controls.Window window = GetContainerWindow(owner, view);

                    if (window != null)                         window.Close();                 }             }         }

        void btn_Click(object sender, RoutedEventArgs e)         {             Button btn = sender as Button;             System.Windows.Controls.Window window = btn.Tag as System.Windows.Controls.Window;             if (window != null)             {                 window.Visibility = window.Visibility == Visibility.Visible ? Visibility.Collapsed : Visibility.Visible;             }         }

        private System.Windows.Controls.Window GetContainerWindow(Grid owner, object view)         {             foreach (UIElement ui in owner.Children)             {                 System.Windows.Controls.Window window = ui as System.Windows.Controls.Window;                 if (window != null && window.Content == view)                     return window;             }             return null;         }     } } 

自定义的RegionAdapter要实现RegionAdapterBase<T>,这个T就是要承载Region的容器owner，我们的Window控件是需要一个Grid的容器的，所以就是RegionAdapterBase<Grid>，注意里面并没有直接实现Adapt方法，而是在重载AttachBehaviors方法中实现了对region.Views和region.ActiveViews的管理，并实现了窗口操作对View的影响，里面我还加了个类似于Windows任务栏的功能，当然实现的不完善，需要改进。

我们需要把自定义的RegionAdapter介绍给Prism中，让Prism认识他，通过在Bootstrapper中重载ConfigureRegionAdapterMappings方法实现

代码

 

  protected override RegionAdapterMappings ConfigureRegionAdapterMappings()         {             RegionAdapterMappings regionAdapterMappings = Container.TryResolve<RegionAdapterMappings>();             IRegionBehaviorFactory regionBehaviorFactory = Container.TryResolve<IRegionBehaviorFactory>();             if (regionAdapterMappings != null && regionBehaviorFactory != null)             {                 regionAdapterMappings.RegisterMapping(typeof(Grid), new SLWindowRegionAdapter(regionBehaviorFactory));             }             return base.ConfigureRegionAdapterMappings();         }

然后在我需要承载弹出窗口的Grid更改成

<Grid x:Name="contentGrid" Grid.Row="1" Regions:RegionManager.RegionName="SLWindow">

然后在要呈现弹出窗口的地方

 IRegion region = this.regionManager.Regions["SLWindow"];             if (region != null)                 region.Add(view);

搞定，看效果： 1、自动载入模块A，在模块A中弹出窗口显示模块A中的其他View

2、手动载入模块B，并在新的窗口中显示模块B的View