Shrlalgo.RvKits/Melskin/Controls/ToolTip.xaml

<ResourceDictionary
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:assists="clr-namespace:Melskin.Assists">

    <Style TargetType="ToolTip">
        <Setter Property="Background" Value="{DynamicResource BackgroundFloatingBrush}" />
        <Setter Property="Foreground" Value="{DynamicResource TextPrimaryBrush}" />
        <Setter Property="Padding" Value="8" />
        <Setter Property="ToolTipService.InitialShowDelay" Value="0" />
        <Setter Property="assists:ControlAssist.CornerRadius" Value="6" />
        <Setter Property="HasDropShadow" Value="True" />
        <Setter Property="Placement" Value="Bottom" />
        <Setter Property="SnapsToDevicePixels" Value="True" />

        <!--  推荐设置一个默认值  -->
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="ToolTip">
                    <Grid>
                        <!--  箭头  -->
                        <Path
                            x:Name="Arrow"
                            Fill="{TemplateBinding Background}"
                            Stretch="Uniform" />

                        <!--  内容区域  -->
                        <Border
                            x:Name="ContentBorder"
                            Padding="{TemplateBinding Padding}"
                            Background="{TemplateBinding Background}"
                            CornerRadius="{TemplateBinding assists:ControlAssist.CornerRadius}"
                            Effect="{DynamicResource PopupShadow}">
                            <ContentPresenter />
                        </Border>
                    </Grid>
                    <ControlTemplate.Triggers>
                        <!--  当在上方显示时 (Placement=Top)，箭头在下方  -->
                        <Trigger Property="Placement" Value="Top">
                            <Setter TargetName="ContentBorder" Property="Margin" Value="0,0,0,5" />
                            <Setter TargetName="Arrow" Property="Data" Value="M 0,0 L 5,5 L 10,0 Z" />
                            <Setter TargetName="Arrow" Property="Width" Value="10" />
                            <Setter TargetName="Arrow" Property="Height" Value="5" />
                            <Setter TargetName="Arrow" Property="VerticalAlignment" Value="Bottom" />
                            <Setter TargetName="Arrow" Property="HorizontalAlignment" Value="Center" />
                        </Trigger>
                        <!--  当在下方显示时 (Placement=Bottom)，箭头在上方  -->
                        <Trigger Property="Placement" Value="Bottom">
                            <Setter TargetName="ContentBorder" Property="Margin" Value="0,5,0,0" />
                            <Setter TargetName="Arrow" Property="Data" Value="M 0,5 L 5,0 L 10,5 Z" />
                            <Setter TargetName="Arrow" Property="Width" Value="10" />
                            <Setter TargetName="Arrow" Property="Height" Value="5" />
                            <Setter TargetName="Arrow" Property="VerticalAlignment" Value="Top" />
                            <Setter TargetName="Arrow" Property="HorizontalAlignment" Value="Center" />
                        </Trigger>
                        <!--  当在左侧显示时 (Placement=Left)，箭头在右方  -->
                        <Trigger Property="Placement" Value="Left">
                            <Setter TargetName="ContentBorder" Property="Margin" Value="0,0,5,0" />
                            <Setter TargetName="Arrow" Property="Data" Value="M 0,0 L 5,5 L 0,10 Z" />
                            <Setter TargetName="Arrow" Property="Width" Value="5" />
                            <Setter TargetName="Arrow" Property="Height" Value="10" />
                            <Setter TargetName="Arrow" Property="VerticalAlignment" Value="Center" />
                            <Setter TargetName="Arrow" Property="HorizontalAlignment" Value="Right" />
                        </Trigger>
                        <!--  当在右侧显示时 (Placement=Right)，箭头在左方  -->
                        <Trigger Property="Placement" Value="Right">
                            <Setter TargetName="ContentBorder" Property="Margin" Value="5,0,0,0" />
                            <Setter TargetName="Arrow" Property="Data" Value="M 5,0 L 0,5 L 5,10 Z" />
                            <Setter TargetName="Arrow" Property="Width" Value="5" />
                            <Setter TargetName="Arrow" Property="Height" Value="10" />
                            <Setter TargetName="Arrow" Property="VerticalAlignment" Value="Center" />
                            <Setter TargetName="Arrow" Property="HorizontalAlignment" Value="Left" />
                        </Trigger>
                    </ControlTemplate.Triggers>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>
</ResourceDictionary>