Is it expected for a `VisualTransformation` to aff...

# compose

[Vaios Tsitsonis]

Is it expected for a VisualTransformation to affect the new value that was returned from onValueChange? I created a VisualTransformation and added it on a TextField but it seems that when i modify (add or delete) a character on a specific position it may affect character on another position.

[Zach Klippenstein (he/him) [MOD]]

Not sure I understand your question – if you add/remove chars, it would affect the position of all chars after it.

[Vaios Tsitsonis]

I created a VisualTransformation and i have the following effect: The expected format is XX XXXX XXX (To be precise this format changes dynamically based on country selection but for now i am testing this format). I have typed 210 and the cursor is on last position. I type the next character. Let’s say it is 9. The expected behavior is for onValueChange to return this value 2109 but it returns 2190. If I remove the VisualTransformation it works as expected, so it seems that somehow it creates the problem

[Zach Klippenstein (he/him) [MOD]]

VisualTransformations are famously tricky to write correctly, and in some cases impossible. If possible, use InputTransformation and OutputTransformation in the new BasicTextField instead.

[Vaios Tsitsonis]

The problem is that I need to use OutlinedTextField and i do not see any way to delegate these values to BasicTextField. Does it have to do with my current compose version?

[Zach Klippenstein (he/him) [MOD]]

It was added to material3 in 1.4, which just entered beta.