使用 ListBox（或其他 ItemsControl）托管 Caliburn 演示者

发布于 2024-08-12 13:35:13 字数 952 浏览 5 评论 0原文

如果我有一个 MultiPresenter 并且我使用 ListBox 来显示它托管的 Presenters，我如何让 Caliburn 发现并绑定项目的视图和视图模型？

例如，如果我有一个看起来像这样的简单视图：

<UserControl x:Class="MyProject.Views.CarView"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
    <Grid>
        <ListBox ItemsSource="{Binding Parts}" />
    </Grid>
</UserControl>

它绑定到 CarViewModel：

public class CarViewModel : MultiPresenter
{
    public BindableCollection<IPartViewModel> Parts { get; }
}

并且 Parts 集合包含实现 IPresenter< 的各种对象/code> 并具有相应的视图，例如 WheelViewModel 和 WheelView，以及 EngineViewModel 和 EngineView。

我希望 Caliburn 使用视图策略为我解决视图。这可能吗？在这种情况下，我需要做什么才能正确设置演示者的层次结构？

原文

If I have a MultiPresenter and I am using a ListBox to display the Presenters it is hosting, how do I get Caliburn to discover and bind the views and view models for the items?

For example, if I have a simple view that looks something like this:

<UserControl x:Class="MyProject.Views.CarView"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
    <Grid>
        <ListBox ItemsSource="{Binding Parts}" />
    </Grid>
</UserControl>

Which is bound to the CarViewModel:

public class CarViewModel : MultiPresenter
{
    public BindableCollection<IPartViewModel> Parts { get; }
}

And the Parts collection contains various objects that implement IPresenter and have corresponding views, e.g. WheelViewModel and WheelView, and EngineViewModel and EngineView.

I'd like Caliburn to resolve the views for me using the view strategy. Is this possible? What do I need to do to correctly set up the hierarchy of presenters in this case?

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流年已逝 2024-08-19 13:35:13

您不必为此更改演示者层次结构。我只建议您考虑使用 MultiPresenter.Presenters 属性来收集子 ViewModel 以及 MultiPresenter.Open 和 MultiPresenter.Shutdown 方法（如果需要）强制子 ViewModel 生命周期。

对于绑定问题，您应该为 ListBox 项定义模板：

<ListBox ItemsSource="{Binding Parts}">
    <ListBox.ItemTemplate>
        <DataTemplate>
            <ContentControl cal:View.Model="{Binding}" />
        </DataTemplate>
    </ListBox.ItemTemplate>
</ListBox>

使用 cal:View.Model 附加属性，框架负责为每个 ViewModel 创建适当的 View，将其绑定到 ViewModel 并将其注入到 ContentControl 中。

您还应该确保 View 和 ViewModel 的命名空间和类命名遵循 Caliburn 默认约定如果您希望框架正确推断您的视图。否则，您必须编写一个自定义 IViewStrategy（但这并不难）。

编辑：修复了 cal:View.Model 属性中的绑定表达式

You don't have to change presenter hierarchy for this. I only suggest you to consider using the MultiPresenter.Presenters property to collect child ViewModels and the MultiPresenter.Open and MultiPresenter.Shutdown methods if you need to enforce child ViewModels lifecycle.

For the binding issue, you should define the template for the ListBox items:

<ListBox ItemsSource="{Binding Parts}">
    <ListBox.ItemTemplate>
        <DataTemplate>
            <ContentControl cal:View.Model="{Binding}" />
        </DataTemplate>
    </ListBox.ItemTemplate>
</ListBox>

Using cal:View.Model attached property, the framework takes care of creating an appropriate View for each ViewModel, binding it to the ViewModel and injecting it into the ContentControl.

You should also make sure that your namespace and class naming for Views and ViewModels follows the Caliburn default convention if you want your Views to be correctly inferred by the framework. Otherwise, you have to write a custom IViewStrategy (it's not hard, though).

Edit: fixed binding expression in cal:View.Model property

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