WPF - ItemTemplate 未按预期运行 [英] WPF - ItemTemplate not acting as expected

问题描述

我有一个 UserControl 用于显示 UIElement 的列表.该控件由单个 ItemsControl 组成，它的 ItemPanelTemplate 切换为水平 StackPanel，其 ItemsSource 绑定到 <UserControl 公开的code>DependencyProperty 及其在UserControl.Resources 中设置的ItemTemplate.

I have a UserControl which I'm using to display a list of UIElements. The control consists of a single ItemsControl with it's ItemPanelTemplate switched for a horizontal StackPanel, its ItemsSource bound to a DependencyProperty exposed by the UserControl and its ItemTemplate set in the UserControl.Resources.

一切正常，除了 ItemTemplate 从未得到应用，我不明白为什么.完整来源如下.

Everything works fine except the ItemTemplate never get's applied and I can't see why. The full source is below.

UserControl.xaml -

UserControl.xaml -

<UserControl x:Name="UC" x:FieldModifier="private" x:Class="ContentSliderControl.ContentSlider"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
<UserControl.Resources>

    <DataTemplate x:Key="pageTemplate">
        <Border CornerRadius="10" Padding="5" Height="200" Width="200" Background="#333">
            <ContentControl Content="{Binding}"/>
        </Border>
    </DataTemplate>

    <ItemsPanelTemplate x:Key="template">
        <StackPanel IsItemsHost="True"
            Orientation="Horizontal"
            ScrollViewer.HorizontalScrollBarVisibility="Disabled"
            ScrollViewer.VerticalScrollBarVisibility="Disabled"/>
    </ItemsPanelTemplate>
</UserControl.Resources>

<ItemsControl ItemsPanel="{StaticResource template}" 
              ItemTemplate="{StaticResource pageTemplate}" 
              ItemsSource="{Binding ElementName=UC,Path=Pages}"/>

UserControl.xaml.cs -

UserControl.xaml.cs -

[ContentProperty("Pages")]
public partial class ContentSlider : UserControl
{


    public List<UIElement> Pages
    {
        get { return (List<UIElement>)GetValue(PagesProperty); }
        //set { SetValue(PagesProperty, value); }
    }

    // Using a DependencyProperty as the backing store for Pages.  This enables animation, styling, binding, etc...
    public static readonly DependencyProperty PagesProperty =
        DependencyProperty.Register("Pages", typeof(List<UIElement>), typeof(ContentSlider), new UIPropertyMetadata(null));



    public ContentSlider()
    {
        InitializeComponent();
    }
}

}

我像这样在主窗口中使用控件 -

I consume the control in my main window like this -

    <slider:ContentSlider >
    <slider:ContentSlider.Pages>
        <Button>1</Button>
        <Button>2</Button>
        <Button>3</Button>
        <Button>4</Button>
    </slider:ContentSlider.Pages>
</slider:ContentSlider>

按钮看起来不错，但不在 200px 方形边框内.

The buttons appear fine but not inside the 200px square border.

任何帮助将不胜感激.谢谢.

Any help would be greatlly appriciated. Thanks.

推荐答案

因为是UIElement的列表，只有在item不能直接显示的情况下才会应用item模板.

It's because it's a list of UIElement, the item template is only applied if the items can't be displayed directly.

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