棱镜4 - 局部范围RegionManager [英] Prism 4 - locally scoped RegionManager
问题描述
我有Silverlight 4的应用与PRISM 4,我使用MEF。
I have silverlight 4 application with PRISM 4, I'm using MEF.
我的壳定义了模块被加载一个主区域,我想模块有自己RegionManager,使得它们限定区域在本地RegionManager代替全球位置。我想这个地方RegionManager由容器(类型IRegionManager)来解决时,模块内。
My Shell defines one main region in which modules are loaded, I want modules to have their own RegionManager, so regions that they define are places in local RegionManager instead of global. And I want this local RegionManager to be resolved by container (for type IRegionManager) when inside the module.
不过从文档的方法:
IRegion detailsRegion = this.regionManager.Regions["DetailsRegion"];
View view = new View();
bool createRegionManagerScope = true;
IRegionManager detailsRegionManager = detailsRegion.Add(view, null,
createRegionManagerScope);
我不工作,从子视图内解决IRegionManager时,我仍然得到GlobalRegionManager。
Doesnt work for me, when resolving IRegionManager from inside child view I still get GlobalRegionManager.
推荐答案
我是在相同的情况下,你,我有一个嵌套的区域经理,但所有的子观点仍然得到全球区域经理。我想出了什么,我认为一个合理的解决方案。
I was in the same situation as you, I had a nested region manager, but all of the child views were still getting the global region manager. I came up with what I consider a reasonable solution.
首先,我定义一个接口:
First I define an interface:
/// <summary>
/// An interface which is aware of the current region manager.
/// </summary>
public interface IRegionManagerAware
{
/// <summary>
/// Gets or sets the current region manager.
/// </summary>
/// <value>
/// The current region manager.
/// </value>
IRegionManager RegionManager { get; set; }
}
然后我设置一个 RegionBehavior
像这样:
/// <summary>
/// A behaviour class which attaches the current scoped <see cref="IRegionManager"/> to views and their data contexts.
/// </summary>
public class RegionAwareBehaviour : RegionBehavior
{
/// <summary>
/// The key to identify this behaviour.
/// </summary>
public const string RegionAwareBehaviourKey = "RegionAwareBehaviour";
/// <summary>
/// Override this method to perform the logic after the behaviour has been attached.
/// </summary>
protected override void OnAttach()
{
Region.Views.CollectionChanged += RegionViewsChanged;
}
private void RegionViewsChanged(object sender, NotifyCollectionChangedEventArgs e)
{
Contract.Requires<ArgumentNullException>(e != null);
if (e.NewItems != null)
foreach (var item in e.NewItems)
MakeViewAware(item);
}
private void MakeViewAware(object view)
{
Contract.Requires<ArgumentNullException>(view != null);
var frameworkElement = view as FrameworkElement;
if (frameworkElement != null)
MakeDataContextAware(frameworkElement);
MakeAware(view);
}
private void MakeDataContextAware(FrameworkElement frameworkElement)
{
Contract.Requires<ArgumentNullException>(frameworkElement != null);
if (frameworkElement.DataContext != null)
MakeAware(frameworkElement.DataContext);
}
private void MakeAware(object target)
{
Contract.Requires<ArgumentNullException>(target != null);
var scope = target as IRegionManagerAware;
if (scope != null)
scope.RegionManager = Region.RegionManager;
}
}
然后将此运用到你的引导程序的所有国家和地区:
Then apply this to all regions in your bootstrapper:
protected override IRegionBehaviorFactory ConfigureDefaultRegionBehaviors()
{
var behaviours = base.ConfigureDefaultRegionBehaviors();
behaviours.AddIfMissing(RegionAwareBehaviour.RegionAwareBehaviourKey, typeof(RegionAwareBehaviour));
return behaviours;
}
然后,所有你需要做的是落实 IRegionManagerAware
在您的视图/视图模型,大概像这样:
Then all you have to do is implement IRegionManagerAware
on your view/viewmodel, probably like so:
public class MyView : IRegionManagerAware
{
IRegionManager RegionManager { set; get; }
}
当此视图添加到区域
然后,行为将正确地设置在 RegionManager
属性设置为当前范围区域经理。
Then when this view is added to a region, the behaviour will correctly set the RegionManager
property to the currently scoped region manager.
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