Question

我将ListboxItem样式定义为：

<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
    <Style x:Key="VoidwalkerListBoxItem" TargetType="ListBoxItem">
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="ListBoxItem">
                    <Border
                        Name="_itemContainer"
                        Padding="0"
                        BorderBrush="Transparent"
                        BorderThickness="1"
                        SnapsToDevicePixels="true">
                        <ContentPresenter />
                    </Border>
                    <ControlTemplate.Triggers>
                        <!--
                            Is Selected Triggers
                        -->
                        <Trigger Property="IsSelected" Value="True">
                            <Setter TargetName="_itemContainer" Property="BorderBrush" Value="{DynamicResource VoidwalkerBorderBrush}" />
                            <Setter TargetName="_itemContainer" Property="Background" Value="Red" />
                        </Trigger>

                        <!--
                            Is Mouse Over Triggers
                        -->
                        <Trigger Property="IsMouseOver" Value="True">
                            <Setter TargetName="_itemContainer" Property="BorderBrush" Value="{DynamicResource VoidwalkerBorderBrush}" />
                        </Trigger>
                        <!--
                            Alternation Coloration Triggers
                        -->
                        <Trigger Property="ItemsControl.AlternationIndex" Value="0">
                            <Setter Property="Foreground" Value="{DynamicResource VoidwalkerForegroundBrush}" />
                            <Setter TargetName="_itemContainer" Property="Background" Value="{DynamicResource VoidwalkerContextBrush}" />
                        </Trigger>
                        <Trigger Property="ItemsControl.AlternationIndex" Value="1">
                            <Setter Property="Foreground" Value="{DynamicResource VoidwalkerForegroundBrush}" />
                            <Setter TargetName="_itemContainer" Property="Background" Value="{DynamicResource VoidwalkerControlBrush}" />
                        </Trigger>
                    </ControlTemplate.Triggers>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>
</ResourceDictionary>

基本上，我正在尝试做的是交替每个其他项目的背景颜色，这是有效的。这是一张图片：

然而，当我想要为所选项目的背景着色时会出现问题，在这种情况下，我选择红色用于测试目的，以及灰色边框画笔。结果如下：

如您所见，我选择了“项目009”，但背景未更改为红色。唯一改变的是边框颜色。如果我禁用AlternationIndex触发器，背景将正确着色。这让我相信，由于某种原因，AlternationIndex触发器优先于IsSelected触发器，或者在IsSelected Trigger之后触发，因此我看不到红色背景。

我的问题是：如何修复我的实现以绕过IsSelected触发器的明显覆盖，为我的背景着色着色，同时还保持所需的AlternationIndex着色？

Answer 1

等等......我觉得自己很蠢。你知道，从来没有一次我认为XAML可能有一个加载/声明顺序。显而易见的问题是触发器是在声明它们的顺序内触发的。这说得通。无论如何，我的问题的一个令人尴尬的简单解决方案如下......首先声明AlternationIndex触发器，然后在XAML中声明IsSelected触发器的最后一个。例如：

<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
    <Style x:Key="VoidwalkerListBoxItem" TargetType="ListBoxItem">
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="ListBoxItem">
                    <Border
                        Name="_itemContainer"
                        Padding="0"
                        BorderBrush="Transparent"
                        BorderThickness="1"
                        SnapsToDevicePixels="true">
                        <ContentPresenter />
                    </Border>
                    <ControlTemplate.Triggers>
                        <!--
                            Alternation Coloration Triggers
                        -->
                        <Trigger Property="ItemsControl.AlternationIndex" Value="0">
                            <Setter Property="Foreground" Value="{DynamicResource VoidwalkerForegroundBrush}" />
                            <Setter TargetName="_itemContainer" Property="Background" Value="{DynamicResource VoidwalkerContextBrush}" />
                        </Trigger>
                        <Trigger Property="ItemsControl.AlternationIndex" Value="1">
                            <Setter Property="Foreground" Value="{DynamicResource VoidwalkerForegroundBrush}" />
                            <Setter TargetName="_itemContainer" Property="Background" Value="{DynamicResource VoidwalkerControlBrush}" />
                        </Trigger>
                        <!--
                            Is Selected Triggers
                        -->
                        <Trigger Property="IsSelected" Value="True">
                            <Setter TargetName="_itemContainer" Property="BorderBrush" Value="{DynamicResource VoidwalkerBorderBrush}" />
                            <Setter TargetName="_itemContainer" Property="Background" Value="Red" />
                        </Trigger>

                        <!--
                            Is Mouse Over Triggers
                        -->
                        <Trigger Property="IsMouseOver" Value="True">
                            <Setter TargetName="_itemContainer" Property="BorderBrush" Value="{DynamicResource VoidwalkerBorderBrush}" />
                        </Trigger>

                    </ControlTemplate.Triggers>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>
</ResourceDictionary>

Server

ListBoxItem AlternationIndex触发器覆盖IsSelected触发器

1 个答案: