TextTrimming from left

Question

Is there a way to specify text trimming on a TextBlock to be from the left side?

I've manage to accomplish two out of three scenarios (the third being the one I need):

1. Regular trimming

   <TextBlock 
       VerticalAlignment="Center" 
       Width="80" 
       TextTrimming="WordEllipsis"
       Text="A very long text that requires trimming" />
   
   // Result: "A very long te..."
   

2. Left trimming

   <TextBlock 
       VerticalAlignment="Center" 
       Width="80" 
       FlowDirection="RightToLeft"
       TextTrimming="WordEllipsis"
       Text="A very long text that requires trimming." />
   
   // Result: "...A very long te"
   

3. Left trimming where the end of the text is seen

   // Desired result: "...uires trimming"
   

Does anyone know if this is possible? Thanks.

Answer 1

You can't do this out-of-the-box, but I can think of two things that might work:

1) Create an attached property for TextBlock called something like LeftTrimmingText. Then, you would set this property instead of the Text property. E.g.

  <TextBlock my:TextBlockHelper.LeftTrimmingText="A very long text that requires trimming." />

The attached property would calculate how many characters could actually be displayed, and then set the Text property of the TextBlock accordingly.

2) Create your own class which wraps a TextBlock, and add your own properties to take care of the required logic.

I think the first option is easier.