Check width of TextBlock after content changed

Question

I have some TextBlock, that can display very long string.

However, when TextBlock content width become greater than TextBlock own width, i want to cut some part of content and place "..." at the end instead.

I will display full content as TooTtip.

<TextBlock Text="{Binding Path=MyValue}" TextAlignment="Right" FontWeight="Bold" ToolTip="{Binding MyValue}" />

As far as i know TextBlock have no events, that can fire after content changed. Is there any good approach to listen something like contentChanged event on TextBlock, calculate text width, compare with control width and cut part of content that not fit?

I need to do it in codebehind, because viewmodel cant be changed some reasons that not matter.

Why not just set TextTrimming no either CharacterEllipsis or WordEllipsis? — Clemens
– Clemens, Commented Aug 19, 2015 at 9:31
You can write a converter which would contain that logic and pass right data to TextBlock. — Martin Heralecký
– Martin Heralecký, Commented Aug 19, 2015 at 9:31

user1666620 · Accepted Answer · 2015-08-19 09:32:14Z

You can use TextTrimming:

https://msdn.microsoft.com/en-us/library/system.windows.controls.textblock.texttrimming(v=vs.110).aspx

<TextBlock Text="{Binding Path=MyValue}" TextAlignment="Right" FontWeight="Bold" ToolTip="{Binding MyValue}" TextTrimming="WordEllipsis" />

or you can set it in codebehind:

myTextBlock.TextTrimming = TextTrimming.CharacterEllipsis;

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