wpf - 如何防止 WPF 触发器在退出时重置原始值

Question

我使用触发器有一个鼠标悬停选择 ListView :

<ListView.ItemContainerStyle>
    <Style TargetType="{x:Type ListViewItem}">
        <Style.Triggers>
            <Trigger Property="IsMouseOver" Value="True">
                <Setter Property="IsSelected" Value="True" />
            </Trigger>
        </Style.Triggers>
    </Style>
</ListView.ItemContainerStyle>

但是，当鼠标移出时，触发器设置 IsSelected返回 false，这在此处是不需要的。有没有办法让触发器只在进入时设置而不是在退出时重置？

Answer 1

这是什么EventTriggers是给:

Unlike Trigger, EventTrigger has no concept of termination of state, so the action will not be undone once the condition that raised the event is no longer true.

例如，在您的情况下:

<EventTrigger RoutedEvent="MouseEnter">
    <BeginStoryboard>
        <Storyboard>
            <BooleanAnimationUsingKeyFrames Storyboard.TargetProperty="IsSelected">
                <DiscreteBooleanKeyFrame KeyTime="0" Value="True" />
            </BooleanAnimationUsingKeyFrames>
        </Storyboard>
    </BeginStoryboard>
</EventTrigger>