WPF - 绑定用户控件可见性属性 [英] WPF - Bind UserControl visibility to a property

问题描述

我绑定到的ObservableCollection一个ListView。数据从网络加载，然后加入到集合中。下载需要几秒钟，我想表明数据加载用户。

I have a ListView bound to ObservableCollection. Data are loaded from the internet and then added to collection. The download takes few seconds and I want to indicate user that the data is loading.

我创建了一个用户控件，表示活动。我把它的ControlTemplate内。

I created an UserControl that indicates activity. I placed it inside of ControlTemplate.

<ControlTemplate x:Key="ListViewControlTemplate1" TargetType="{x:Type ListView}">
    <Grid>
        <local:ActivityIndicatorControl 
            HorizontalAlignment="Center" 
            Height="Auto" 
            Margin="0" 
            VerticalAlignment="Center"/>
    </Grid>
</ControlTemplate>

我要绑定 ActivityIndi​​catorControl 的可见性属性，比方说布尔IsLoading 并将其设置为可见/折叠水涨船高。

I would like to bind Visibility of ActivityIndicatorControl to a property, let's say bool IsLoading and set it to Visible/Collapsed correspondingly.

谢谢！

推荐答案

我会推荐使用<一个href=\"http://msdn.microsoft.com/en-us/library/system.windows.data.ivalueconverter.aspx\"><$c$c>IValueConverter接受你的布尔值，并返回能见度枚举的成员。

I would recommend using a IValueConverter to accept your boolean, and return a member of Visibility enumeration.

下面是一个很好的例子：<一href=\"http://jeffhandley.com/archive/2008/10/27/binding-converters---visibilityconverter.aspx\">http://jeffhandley.com/archive/2008/10/27/binding-converters---visibilityconverter.aspx

Here is a good example of one: http://jeffhandley.com/archive/2008/10/27/binding-converters---visibilityconverter.aspx

该XAML是这样的：

首先，定义资源的转换器（把这个资源字典）：

First you define a resource for the converter (put this in a resource dictionary):

<local:BooleanToVisibiltyConverter x:Key="myBoolToVisibilityConverter" />

，然后改变你的模板是这样的：

And then change your template like this:

<ControlTemplate x:Key="ListViewControlTemplate1" TargetType="{x:Type ListView}">
    <Grid Visibility="{Binding IsLoading, Converter={StaticResource myBoolToVisibilityConverter}}>
        <local:ActivityIndicatorControl 
            HorizontalAlignment="Center" 
            Height="Auto" 
            Margin="0" 
            VerticalAlignment="Center"/>
    </Grid>
</ControlTemplate>

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