我有一个设计要求，如图像（虽然这是简化版） .

我需要按钮的最终x坐标和要对齐的图像，按钮需要向左扩展，具体取决于绑定的文本 .

我做了什么：

<RelativeLayout Padding="0,0,0,0" Margin="0,0,0,0"
            VerticalOptions="FillAndExpand"
            HorizontalOptions="FillAndExpand">

   //other children

 <Image Source="circle.png"
         Aspect="AspectFit"
         x:Name="circleImg"
         RelativeLayout.YConstraint="{ConstraintExpression Type=RelativeToParent,
                  Property=Width, Factor=0.48, Constant=0}"
         RelativeLayout.XConstraint="{ConstraintExpression Type=RelativeToParent,
                  Property=Width, Factor=0.811, Constant=0}"
         RelativeLayout.WidthConstraint="{ConstraintExpression Type=RelativeToParent,Property=Width, Factor=0.1593, Constant = 0}"
         RelativeLayout.HeightConstraint="{ConstraintExpression Type=RelativeToParent,Property=Width, Factor=0.1593, Constant = 0}">
    </Image>


 <Button 
           Text="{Binding ButtonText}"
           TextColor="White"
           BorderColor="Transparent"
           RelativeLayout.YConstraint="{ConstraintExpression Type=RelativeToParent,
              Property=Height, Factor=0.0, Constant=0}"
           RelativeLayout.XConstraint="{ConstraintExpression Type=RelativeToView,
              ElementName=circleImg, Property=X, Factor=1, Constant=0}"
           RelativeLayout.WidthConstraint="{ConstraintExpression Type=RelativeToParent,Property=Width, Factor=0.1593, Constant = 0}"/>

   //other children


</RelativeLayout>

这给了我一个按钮，开始与图像的起始位置对齐，宽度等于图像 . 但是，如果绑定文本很长，则文本会被截断 . 我试过 VerticalOptions="EndAndExpand" ，但它不起作用 .

有没有办法可以指定按钮的结束x坐标，而不是它的开始，并使其向左展开？

enter image description here

xaml xamarin xamarin.forms relativelayout