WPF扩展器触发器 [英] WPF Expanders Triggers

问题描述

我有2个并排扩展器。
一次只能打开1个。

I have 2 expanders side by side. Only 1 can be opened at a time.

我想为他们直接在其定义中写触发器 ，例如：

I want to write Triggers for them directly in their definition like this:

<Expander x:Name="MenuOverView" ExpandDirection="Left">                 
                <Expander.Triggers>
                    <Trigger Property="IsExpanded" Value="False" SourceName="MenuDetailed">
                                <Setter Property="IsExpanded" Value="True" TargetName="MenuOverView" /> 
                    </Trigger>
                </Expander.Triggers>
</Expander>

<Expander x:Name="MenuDetailed" ExpandDirection="Right">                 
                <Expander.Triggers>
                    <Trigger Property="IsExpanded" Value="False" SourceName="MenuOverView">
                                <Setter Property="IsExpanded" Value="True" TargetName="MenuDetailed" />
                    </Trigger>
                </Expander.Triggers>
   </Expander>

这当然是错误的代码。
请问我该怎么做？

This is of course a bad code.. How can I do that please?

推荐答案

好的，我认为这是不可能的。
在这种情况下，我提供了一种解决方案：

OK I think that's not possible. I provide a solution in that case:

<!--Add this to the resources dictionary-->
<conv:BoolInverterConverter x:Key="boolInvertorConverter" />

...

<Expander x:Name="MenuOverView" ExpandDirection="Left" 
                      IsExpanded="{Binding ElementName=MenuDetailed, Converter={StaticResource boolInvertorConverter}, Path=IsExpanded}"                      
                      VerticalContentAlignment="Center"  >  

...

转换器代码：

public class BoolInverterConverter : System.Windows.Data.IValueConverter
        {
            #region IValueConverter Members

            public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
            {
                bool i;
                if (bool.TryParse(value.ToString(), out i) == false) return null;            

                return !i;
            }

            public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
            {
                bool i;
                if (bool.TryParse(value.ToString(), out i) == false) return null;

                return !i;
            }

            #endregion
        }

享受！

这篇关于WPF扩展器触发器的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！