使ScrollViewer中的TextBlock自动缩放以适合

Question

I'm creating a Windows 8 Metro app. I have a TextBlock in a ScrollViewer . I'm wondering if it possible to programmatically change the ZoomFactor of the ScrollViewer to make the TextBlock auto-fit the width of the screen. Meaning, the longest line of the TextBlock fit the screen width (without wrapping).

Answer 1

Generally I find ViewBox to be the most useful way to scale xaml contents to fit a predetermined size. Simply leave your ScrollViewer and TextBlock with no size requirements (and turn wrapping off) and then put the ScrollViewer inside a ViewBox with Scale=Uniform (or possibly UniformToFit depending on your needs).

The TextBlock will cause the ScrollViewer to size appropriately for its contents, and then the ViewBox will scale the ScrollViewer to exactly fit in its own control extents. (Putting the ViewBox inside your root grid or as the root control of your page should cause it to fill the entire screen.)