动态路径WPF的风格触发

问题描述

在下面的样式，是有办法使绑定路径通用的，所以这种风格可以由多个用户使用，每个提供不同的绑定路径？

 ＆LT;风格X：键=OptionalBackground
       的TargetType ={X：类型数据presenter：CellValue presenter}
       支持算法FMP ={StaticResource的OptionalFieldCell presenter}＆GT;
    ＆LT; Style.Triggers＆GT;
        ＆LT; D​​ataTrigger绑定={绑定的RelativeSource = {自我的RelativeSource}，
                                       路径= Record.DataItem.IsEditAllowed}
                     值=FALSE＆GT;
            ＆LT; setter属性=背景VALUE ={StaticResource的ReadOnlyField}/＆GT;
        ＆LT; / DataTrigger＆GT;
    ＆LT; /Style.Triggers>
＆LT; /样式和GT;
 

解决方案

您可以从风格派生创造一个速记符号，看起来像这样：

 ＆lt;局部：BackgroundStyle
    X：键=OptionalBackground
    的TargetType ={X：类型数据presenter：CellValue presenter}
    支持算法FMP ={StaticResource的OptionalFieldCell presenter}
    PATH =Record.DataItem.IsEditAllowed
    VALUE ={StaticResource的ReadOnlyField}/＆GT;
 

和用于本实施例的实施方案可能是：

 公共类BackgroundStyle：样式，ISupportInitialize接口
{
    公共字符串路径{搞定;组; }
    公共对象值{搞定;组; }    公共无效BeginInit在（）{}    公共无效EndInit在（）
    {
        VAR触发=新DataTrigger
        {
            绑定=新绑定
            {
                路径=新的PropertyPath（路径）
                的RelativeSource =新的RelativeSource（RelativeSourceMode.Self）
            }，
        };
        trigger.Setters.Add（新二传手（Control.BackgroundProperty，值））;
        Triggers.Add（触发）;
    }
}
 

In the following style, is there a way to make the Binding Path generic so that this style can be used by multiple consumers, each supplying a different binding path?

<Style x:Key="OptionalBackground"
       TargetType="{x:Type DataPresenter:CellValuePresenter}"
       BasedOn="{StaticResource OptionalFieldCellPresenter}">
    <Style.Triggers>
        <DataTrigger Binding="{Binding RelativeSource={RelativeSource Self},
                                       Path=Record.DataItem.IsEditAllowed}"
                     Value="False">
            <Setter Property="Background" Value="{StaticResource ReadOnlyField}" />
        </DataTrigger>
    </Style.Triggers>
</Style>

解决方案

You can derive from Style to create a shorthand notation that looks like this:

<local:BackgroundStyle
    x:Key="OptionalBackground"
    TargetType="{x:Type DataPresenter:CellValuePresenter}"
    BasedOn="{StaticResource OptionalFieldCellPresenter}"
    Path="Record.DataItem.IsEditAllowed"
    Value="{StaticResource ReadOnlyField}"/>

and an implementation for this example might be:

public class BackgroundStyle : Style, ISupportInitialize
{
    public string Path { get; set; }
    public object Value { get; set; }

    public void BeginInit() { }

    public void EndInit()
    {
        var trigger = new DataTrigger
        {
            Binding = new Binding
            {
                Path = new PropertyPath(Path),
                RelativeSource = new RelativeSource(RelativeSourceMode.Self)
            },
        };
        trigger.Setters.Add(new Setter(Control.BackgroundProperty, Value));
        Triggers.Add(trigger);
    }
}

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