RelativePanel

RelativePanel 已在 Windows 10 中引入，主要用于支持自适应布局，其中面板的子元素根据可用空间的不同布局。RelativePanel 通常用于视觉状态 ，用于切换布局配置，适应屏幕或窗口大小，方向或用例。子元素使用附加属性来定义它们相对于面板和彼此的位置。

<RelativePanel
    VerticalAlignment="Stretch"
    HorizontalAlignment="Stretch">
    <Rectangle
        x:Name="rectangle1"
        RelativePanel.AlignLeftWithPanel="True"
        Width="360"
        Height="50"
        Fill="Red"/>
    <Rectangle
        x:Name="rectangle2"
        RelativePanel.Below="rectangle1"
        Width="360"
        Height="50"
        Fill="Green" />
</RelativePanel>
<VisualStateManager.VisualStateGroups>
    <VisualStateGroup>
        <VisualState>
            <VisualState.StateTriggers>
                <!--VisualState to be triggered when window width is >=720 effective pixels.-->
                <AdaptiveTrigger
                    MinWindowWidth="720" />
            </VisualState.StateTriggers>
            <VisualState.Setters>
                <Setter
                    Target="rectangle2.(RelativePanel.Below)"
                    Value="{x:Null}" />
                <Setter
                    Target="rectangle2.(RelativePanel.RightOf)"
                    Value="rectangle1" />
                <Setter
                    Target="rectangle1.(RelativePanel.AlignLeftWithPanel)"
                    Value="False" />
                <Setter
                    Target="rectangle1.(RelativePanel.AlignVerticalCenterWithPanel)"
                    Value="True" />
                <Setter
                    Target="rectangle2.(RelativePanel.AlignVerticalCenterWithPanel)"
                    Value="True" />
            </VisualState.Setters>
        </VisualState>
    </VisualStateGroup>
</VisualStateManager.VisualStateGroups>