WPF 中 ListBoxItem 上的虚线边框 [英] Dotted border on ListBoxItem in WPF

问题描述

如何将 ListBoxItems 上的默认边框设为虚线边框?请参阅以下样式设置方式:

How can I make the default border on my ListBoxItems a dotted border? See following way of styling it:

<Grid.Resources>
    <Style TargetType="{x:Type ListBoxItem}">
        <Setter Property="Height" Value="30" />
        <Setter Property="BorderThickness" Value="0,0,0,1" />
        <Setter Property="BorderBrush" Value="Silver" />
        <Setter Property="Content" Value="" />
        <Style.Triggers>
            <Trigger Property="ItemsControl.AlternationIndex" Value="3">
                <Setter Property="BorderBrush" Value="Black"></Setter>
            </Trigger>
        </Style.Triggers>
    </Style>
</Grid.Resources>

这里我将 AlternationIndex 0、1 和 2 设置为虚线边框而不是实线.这怎么办?

Here I make the AlternationIndex 0, 1 and 2 to a dotted border instead of a solid line. How can this be done?

推荐答案

试试这个:

<Window.Resources>
        <SolidColorBrush x:Key="SelectedBackgroundBrush" Color="#DDD" />
        <SolidColorBrush x:Key="DisabledForegroundBrush" Color="#888" />
        <SolidColorBrush x:Key="DisabledBackgroundBrush" Color="#EEE" />
        <!-- SimpleStyles: ListBoxItem -->
        <Style TargetType="ListBoxItem" x:Key="ListBoxItemTemplate">
            <Setter Property="SnapsToDevicePixels" Value="true"/>
            <Setter Property="OverridesDefaultStyle" Value="true"/>
            <Setter Property="Template">
                <Setter.Value>
                    <ControlTemplate TargetType="ListBoxItem">
                        <Grid>
                            <Rectangle x:Name="Rectangle" Fill="Transparent" Stroke="Black" 
                                       StrokeDashCap="Square" StrokeThickness="0" SnapsToDevicePixels="True">
                                <Rectangle.StrokeDashArray>
                                    <sys:Double>5</sys:Double>
                                </Rectangle.StrokeDashArray>
                            </Rectangle>
                            <Border 
                                Name="Border"
                                Padding="2"
                                BorderThickness="{Binding RelativeSource={RelativeSource TemplatedParent}, Path=BorderThickness}"
                                BorderBrush="{Binding RelativeSource={RelativeSource TemplatedParent}, Path=BorderBrush}">
                                <ContentPresenter />
                            </Border>
                        </Grid>
                        <ControlTemplate.Triggers>
                            <Trigger Property="IsSelected" Value="true">
                                <Setter TargetName="Rectangle" Property="StrokeThickness" Value="1" />
                                <Setter TargetName="Border" Property="BorderThickness" Value="0" />
                            </Trigger>
                            <Trigger Property="IsSelected" Value="true">
                                <Setter TargetName="Rectangle" Property="Fill" Value="{StaticResource SelectedBackgroundBrush}" />
                            </Trigger>
                            <Trigger Property="IsEnabled" Value="false">
                                <Setter Property="Foreground" Value="{StaticResource DisabledForegroundBrush}" />
                            </Trigger>
                        </ControlTemplate.Triggers>
                    </ControlTemplate>
                </Setter.Value>
            </Setter>
        </Style>

        <Style TargetType="{x:Type ListBoxItem}" BasedOn="{StaticResource ListBoxItemTemplate}">
            <Setter Property="Height" Value="30" />
            <Setter Property="BorderThickness" Value="0,0,0,1" />
            <Setter Property="BorderBrush" Value="Silver" />
            <Style.Triggers>
                <Trigger Property="ItemsControl.AlternationIndex" Value="3">
                    <Setter Property="BorderBrush" Value="Black"></Setter>
                </Trigger>
            </Style.Triggers>
        </Style>

    </Window.Resources>
    <StackPanel>
        <ListBox>
            <ListBoxItem Content="Item 1" />
            <ListBoxItem Content="Item 2" />
            <ListBoxItem Content="Item 3" />
            <ListBoxItem Content="Item 4" />
        </ListBox>
    </StackPanel>

所以我在控件模板中的实际边框下方放置了一个矩形.矩形的边框可以是虚线、虚线或 w/e(为了使虚线更小，只需将部分更改为 2，1 不明显).因此，矩形边框厚度的默认值为0，但选择时，我将厚度设置为1，因此它是可见的.我还制作了一些边框属性以绑定到其模板化父级，因此它看起来就像您在样式中设置的一样(刷银色，厚度 0,0,0,1).

So I put a rectangle bellow the actual border in the control template. The rectangle can have its border be dotted, or dashed or w/e (to make the dash smaller just change the part to 2, 1 is not noticeable). So the default value of the rectangle's border thickness is 0, but when selected I set the thickness to 1 so it's visible. I made some border properties to be binded to its templated parent too, so it can look like what you set on your style (brush silver, thickness 0,0,0,1).

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