如何有条件地插入定制的ListView列表项的复选框？ [英] How to conditionally insert a Checkbox in a list item of a customized ListView?

问题描述

我尽量让一个自定义的ListView它如果需要用一些东西，最初的复选框填充每个列表项。当前未显示复选框，所以我想的东西ContentControl中我的code是莫名其妙的错误。

 ＆LT; ListView控件的xmlns =htt​​p://schemas.microsoft.com/winfx/2006/xaml/$p$psentation
           的xmlns：X =htt​​p://schemas.microsoft.com/winfx/2006/xaml＆GT;
＆LT; ListView.View＆GT;
    ＆LT;＆GridView的GT;
        ＆LT; GridViewColumn＆GT;
            ＆LT; GridViewColumn.CellTemplate＆GT;
                ＆LT;＆DataTemplate的GT;
                    ＆LT;  - 每个列表项：[复选框]标签 - ＆GT;
                    ＆LT; StackPanel的方向=横向＆GT;
                        ＆LT;！ - 在code用于可选的复选框 - ＆GT;
                        ＆LT;＆ContentControl中GT;
                            ＆LT; ContentControl.Style＆GT;
                                ＆LT;风格的TargetType =ContentControl中＆GT;
                                    ＆LT; Style.Triggers＆GT;
                                        ＆LT; D​​ataTrigger绑定={结合IsCheckable}VALUE =真＆GT;
                                            ＆LT; setter属性=模板＆GT;
                                                ＆LT; Setter.Value＆GT;
                                                    ＆LT;＆控件模板GT;
                                                        ＆LT;复选框器isChecked ={绑定路径= SomeProperty}/＆GT;
                                                    ＆LT; /控件模板＆GT;
                                                ＆LT; /Setter.Value>
                                            ＆LT; /二传手＆GT;
                                        ＆LT; / DataTrigger＆GT;
                                    ＆LT; /Style.Triggers>
                                ＆LT; /样式和GT;
                            ＆LT; /ContentControl.Style>
                        ＆LT; / ContentControl中＆GT;
                        ＆LT;！ - 非可选测试标签 - ＆GT;
                        ＆LT;标签内容=考试内容/＆GT;
                    ＆LT; / StackPanel的＆GT;
                ＆LT; / DataTemplate中＆GT;
            ＆LT; /GridViewColumn.CellTemplate>
        ＆LT; / GridViewColumn＆GT;
    ＆LT; /ListView.View>
＆LT; /＆的ListView GT;
 

在code背后：

公共部分类MyListView：{的ListView
    公共MyListView（）{
        的InitializeComponent（）;
    }    公共BOOL IsCheckable
    {
        {返回（布尔）的GetValue（IsCheckableProperty）; }
        集合{的SetValue（IsCheckableProperty，值）; }
    }    公共静态只读的DependencyProperty IsCheckableProperty =
        DependencyProperty.Register（
        IsCheckable
        typeof运算（布尔）
        typeof运算（AppropriatenessWidget）
        新UIPropertyMetadata（假））;
}


解决方案

{结合IsCheckable} 绑定到的DataContext 不控制，使用，例如：

{结合IsCheckable，
         的RelativeSource = {的RelativeSource AncestorType =本地：MyListView}}


此外，我怀疑这子类的做法是一个好主意，这样可以很容易地通过处理一个基本的的DataContext 。

I try to make a customized ListView which fills each list item with some stuff and an initial Checkbox if desired. Currently no Checkbox is displayed so I guess my code of the ContentControl stuff is somehow erroneous.

<ListView  xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
           xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
<ListView.View>
    <GridView>
        <GridViewColumn>
            <GridViewColumn.CellTemplate>
                <DataTemplate>
                    <!-- Each list item: [Checkbox] Label -->
                    <StackPanel Orientation="Horizontal">
                        <!-- The code for the optional check box -->
                        <ContentControl>
                            <ContentControl.Style>
                                <Style TargetType="ContentControl">
                                    <Style.Triggers>
                                        <DataTrigger Binding="{Binding IsCheckable}" Value="True">
                                            <Setter Property="Template">
                                                <Setter.Value>
                                                    <ControlTemplate>
                                                        <CheckBox IsChecked="{Binding Path=SomeProperty}" />
                                                    </ControlTemplate>
                                                </Setter.Value>
                                            </Setter>
                                        </DataTrigger>
                                    </Style.Triggers>
                                </Style>
                            </ContentControl.Style>
                        </ContentControl>
                        <!-- The non-optional test label -->
                        <Label Content="Test Content" />
                    </StackPanel>
                </DataTemplate>
            </GridViewColumn.CellTemplate>
        </GridViewColumn>
    </ListView.View>
</ListView>

The Code behind:

public partial class MyListView : ListView {
    public MyListView () {
        InitializeComponent();
    }

    public bool IsCheckable
    {
        get { return (bool)GetValue(IsCheckableProperty); }
        set { SetValue(IsCheckableProperty, value); }
    }

    public static readonly DependencyProperty IsCheckableProperty =
        DependencyProperty.Register(
        "IsCheckable", 
        typeof(bool), 
        typeof(AppropriatenessWidget), 
        new UIPropertyMetadata(false));
}

解决方案

{Binding IsCheckable} binds to the DataContext not the control, use for example:

{Binding IsCheckable,
         RelativeSource={RelativeSource AncestorType=local:MyListView}}

Also i doubt that this subclassing approach is such a good idea, this could easily be handled via an underlying DataContext.

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