Is there such thing as an auto size text view in c...

# compose

[Colton Idle]

Is there such thing as an auto size text view in compose? I searched cs.android.com without being able to find anything related to compose.

Like this?

https://www.youtube.com/watch?v=JYrpEAz_A1U▾

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

I don’t think it’s built in right now but theoretically shouldn’t be too hard to build.

[ste]

@Zach Klippenstein (he/him) [MOD] probably using NativePaint.breakText?

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

I think you can do it without dropping down to any native stuff

[Shakil Karim]

@Zach Klippenstein (he/him) [MOD] Is this correct approach ??

@Composable
@InternalTextApi
fun calculateTextSize(constraints: Constraints, text: AnnotatedString, textSize: TextUnit): TextUnit {
    val textDelegate = TextDelegate(
        text = text,
        style = MaterialTheme.typography.h6.copy(fontSize = textSize),
        maxLines = 1,
        density = LocalDensity.current,
        resourceLoader = object : Font.ResourceLoader {
            override fun load(font: Font): Any {
                return false
            }
        }
    )
    val layoutResult = textDelegate.layout(constraints, LayoutDirection.Ltr)

    return if (layoutResult.didOverflowHeight) {
        Log.d("TAG", "Delegate text size again $textSize")
        calculateTextSize(constraints, text, textSize - 2.sp)
    } else {
        Log.d("TAG", "Delegate text size done $textSize")
        //debug { "Delegate text size done $textSize" }
        textSize
    }

}

[Chris Sinco [G]]

@Siyamed may have insight

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

I don’t think recursion is the best approach – you can start with a known text size, measure, then calculate how much to adjust the text size based on the difference between the measured size and the constraints

[Shakil Karim]

@Zach Klippenstein (he/him) [MOD] Can you please help, how can I achieve this part? "calculate how much to adjust the text size based on the difference between the measured size and the constraints"?

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

Pick a size, measure with that, then scale the size proportional to the difference between that and constraints