WPF ItemsControl 派生自定义控件帮助

发布于 2024-11-04 11:25:08 字数 1347 浏览 0 评论 0原文

我想编写一个 ItemsControl 派生自定义控件。这部分是出于需要，部分是作为学习练习 - 请不要建议我使用 Style、DataTemplate、ControlTemplate、ListBox 等...即，请不要质疑这种需要 - 只要假设它是真实的。
我在网上搜索并发现了很多有用的 ItemControl 信息，但没有明确的示例。当我在 VS 中创建新的自定义控件时，我得到了几乎空的代码和带有

默认 Generic.xaml（此处最少要添加什么？）：

<Style TargetType="{x:Type local:MyItemsControlDerivedClass}">
    <Setter Property="Template">
        <Setter.Value>
            <ControlTemplate TargetType="{x:Type local:MyItemsControlDerivedClass}">
                <Border Background="{TemplateBinding Background}"
                        BorderBrush="{TemplateBinding BorderBrush}"
                        BorderThickness="{TemplateBinding BorderThickness}">        

                </Border>
            </ControlTemplate>
        </Setter.Value>
    </Setter>
</Style>

原文

I would like to write a ItemsControl derived custom control. This is partially from need and partially as a learning exercise - please don't suggest I Style, DataTemplate, ControlTemplate a ListBox etc... I.e. please don't question the need - just assume its genuine.
I've trolled the web and found lots of useful ItemControl info but no clear cut examples.
When I create I new Custom Control in VS I get practically empty code behind and Generic.xaml with a <Style> block where its possible to set ControlTemplates, DataTemplates, Presenters etc via <Setter Property="Template"> etc. But what is the minimum xaml/code needed here to get a control that will bind to an ObservableCollection to ItemsSoruce to display as a list? Put another way: whats the canoical form of a ItemsControl derived custom control?
Do I need an ItemsPresenter? Do I have to specify a stack pannel in the ControlTemplate? Do I have to set TargetType on the <Setter Property="ItemTemplate">? etc.
Spoon feeding prefered eg saying: its easy and I just need to intergrate the DataTemplate over the vector space of item control containers with respect to the panel presenter yada yada... aint a great help.
Further info: The control is a display only orientated ie there is no concept of selected item etc.
Thanks in advance!

Default Generic.xaml (whats minimum to add here?):

<Style TargetType="{x:Type local:MyItemsControlDerivedClass}">
    <Setter Property="Template">
        <Setter.Value>
            <ControlTemplate TargetType="{x:Type local:MyItemsControlDerivedClass}">
                <Border Background="{TemplateBinding Background}"
                        BorderBrush="{TemplateBinding BorderBrush}"
                        BorderThickness="{TemplateBinding BorderThickness}">        

                </Border>
            </ControlTemplate>
        </Setter.Value>
    </Setter>
</Style>

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油饼 2024-11-11 11:25:08

只需看一下默认样式（遵循默认WPF 主题 链接）：

例如 ListBox：

<Setter Property="Template">
    <Setter.Value>
        <ControlTemplate TargetType="{x:Type ListBox}">
            <Border Name="Bd"
                    Background="{TemplateBinding Background}"
                    BorderBrush="{TemplateBinding BorderBrush}"
                    BorderThickness="{TemplateBinding BorderThickness}"
                    SnapsToDevicePixels="true"
                    Padding="1">
                <ScrollViewer Padding="{TemplateBinding Padding}"
                              Focusable="false">
                    <ItemsPresenter SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}"/>
                </ScrollViewer>
            </Border>
            <ControlTemplate.Triggers>
                <Trigger Property="IsEnabled"
                         Value="false">
                    <Setter TargetName="Bd"
                            Property="Background"
                            Value="{DynamicResource {x:Static SystemColors.ControlBrushKey}}"/>
                </Trigger>
                <Trigger Property="IsGrouping"
                         Value="true">
                    <Setter Property="ScrollViewer.CanContentScroll"
                            Value="false"/>
                </Trigger>
            </ControlTemplate.Triggers>
        </ControlTemplate>
    </Setter.Value>
</Setter>

Just take a look at the default styles (follow the Default WPF Themes link):

e.g. ListBox:

<Setter Property="Template">
    <Setter.Value>
        <ControlTemplate TargetType="{x:Type ListBox}">
            <Border Name="Bd"
                    Background="{TemplateBinding Background}"
                    BorderBrush="{TemplateBinding BorderBrush}"
                    BorderThickness="{TemplateBinding BorderThickness}"
                    SnapsToDevicePixels="true"
                    Padding="1">
                <ScrollViewer Padding="{TemplateBinding Padding}"
                              Focusable="false">
                    <ItemsPresenter SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}"/>
                </ScrollViewer>
            </Border>
            <ControlTemplate.Triggers>
                <Trigger Property="IsEnabled"
                         Value="false">
                    <Setter TargetName="Bd"
                            Property="Background"
                            Value="{DynamicResource {x:Static SystemColors.ControlBrushKey}}"/>
                </Trigger>
                <Trigger Property="IsGrouping"
                         Value="true">
                    <Setter Property="ScrollViewer.CanContentScroll"
                            Value="false"/>
                </Trigger>
            </ControlTemplate.Triggers>
        </ControlTemplate>
    </Setter.Value>
</Setter>

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忘年祭陌 2024-11-11 11:25:08

按照 HB 建议添加默认样式即可工作并使控件可用（项目显示）。删除 ItemsPresenter（ScrollViewer 内）会破坏控件（无内容显示）。这篇文章解释了发生了什么：
http://drwpf.com/blog/2009/ 05/12/itemscontrol-l-is-for-lookless/
本质上，ControlTemplate 必须具有：
a) ItemPresenter 或
b) IsItemsHost 属性设置为 true 的面板。
也就是说，您需要添加到麦粒肿的最低限度是一个带有以下任一内容的 ControlTemplate：

或