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Introduce AutoSizeText component & use it for the top bar title of al…
…l main screens
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...c/commonMain/kotlin/io/github/droidkaigi/confsched/droidkaigiui/component/AutoSizeText.kt
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,142 @@ | ||
| package io.github.droidkaigi.confsched.droidkaigiui.component | ||
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| import androidx.compose.foundation.layout.BoxWithConstraints | ||
| import androidx.compose.material3.LocalTextStyle | ||
| import androidx.compose.material3.Text | ||
| import androidx.compose.runtime.Composable | ||
| import androidx.compose.ui.Alignment | ||
| import androidx.compose.ui.Modifier | ||
| import androidx.compose.ui.graphics.Color | ||
| import androidx.compose.ui.platform.LocalDensity | ||
| import androidx.compose.ui.platform.LocalFontFamilyResolver | ||
| import androidx.compose.ui.text.Paragraph | ||
| import androidx.compose.ui.text.TextLayoutResult | ||
| import androidx.compose.ui.text.TextStyle | ||
| import androidx.compose.ui.text.font.FontFamily | ||
| import androidx.compose.ui.text.font.FontStyle | ||
| import androidx.compose.ui.text.font.FontWeight | ||
| import androidx.compose.ui.text.style.TextAlign | ||
| import androidx.compose.ui.text.style.TextDecoration | ||
| import androidx.compose.ui.unit.Constraints | ||
| import androidx.compose.ui.unit.Dp | ||
| import androidx.compose.ui.unit.TextUnit | ||
| import androidx.compose.ui.unit.dp | ||
| import androidx.compose.ui.unit.isFinite | ||
| import androidx.compose.ui.unit.isSpecified | ||
| import androidx.compose.ui.unit.isUnspecified | ||
| import androidx.compose.ui.unit.sp | ||
| import kotlin.math.absoluteValue | ||
| import kotlin.math.ceil | ||
|
|
||
| /** | ||
| * A text component that automatically resizes its font size to fit its content, | ||
| * up to the given [maxFontSize]. (If you don't want to limit the upper bounds | ||
| * of the text size, use [TextUnit.Unspecified] for that parameter.) | ||
| * | ||
| * Adapted from Alchitry on Stack Overflow, licensed under CC BY-SA 4.0: | ||
| * https://stackoverflow.com/a/71416530 | ||
| */ | ||
| @Composable | ||
| fun AutoSizeText( | ||
| text: String, | ||
| modifier: Modifier = Modifier, | ||
| acceptableError: Dp = 5.dp, | ||
| color: Color = Color.Unspecified, | ||
| fontStyle: FontStyle? = null, | ||
| fontWeight: FontWeight? = null, | ||
| fontFamily: FontFamily? = null, | ||
| letterSpacing: TextUnit = TextUnit.Unspecified, | ||
| textDecoration: TextDecoration? = null, | ||
| textAlign: TextAlign? = null, | ||
| contentAlignment: Alignment? = null, | ||
| lineHeight: TextUnit = TextUnit.Unspecified, | ||
| maxLines: Int = Int.MAX_VALUE, | ||
| onTextLayout: (TextLayoutResult) -> Unit = {}, | ||
| style: TextStyle = LocalTextStyle.current, | ||
| maxFontSize: TextUnit = style.fontSize, | ||
| ) { | ||
| val alignment: Alignment = contentAlignment ?: when (textAlign) { | ||
| TextAlign.Left -> Alignment.TopStart | ||
| TextAlign.Right -> Alignment.TopEnd | ||
| TextAlign.Center -> Alignment.Center | ||
| TextAlign.Justify -> Alignment.TopCenter | ||
| TextAlign.Start -> Alignment.TopStart | ||
| TextAlign.End -> Alignment.TopEnd | ||
| else -> Alignment.TopStart | ||
| } | ||
| BoxWithConstraints(modifier = modifier, contentAlignment = alignment) { | ||
| var shrunkFontSize = if (maxFontSize.isSpecified) maxFontSize else 100.sp | ||
|
|
||
| val calculateIntrinsics = @Composable { | ||
| val mergedStyle = style.merge( | ||
| TextStyle( | ||
| color = color, | ||
| fontSize = shrunkFontSize, | ||
| fontWeight = fontWeight, | ||
| textAlign = textAlign ?: TextAlign.Unspecified, | ||
| lineHeight = lineHeight, | ||
| fontFamily = fontFamily, | ||
| textDecoration = textDecoration, | ||
| fontStyle = fontStyle, | ||
| letterSpacing = letterSpacing, | ||
| ), | ||
| ) | ||
| Paragraph( | ||
| text = text, | ||
| style = mergedStyle, | ||
| constraints = Constraints(maxWidth = ceil(LocalDensity.current.run { maxWidth.toPx() }).toInt()), | ||
| density = LocalDensity.current, | ||
| fontFamilyResolver = LocalFontFamilyResolver.current, | ||
| spanStyles = listOf(), | ||
| placeholders = listOf(), | ||
| maxLines = maxLines, | ||
| ellipsis = false, | ||
| ) | ||
| } | ||
|
|
||
| var intrinsics = calculateIntrinsics() | ||
|
|
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| val targetWidth = maxWidth - acceptableError / 2f | ||
|
|
||
| check(targetWidth.isFinite || maxFontSize.isSpecified) { | ||
| "maxFontSize must be specified if the target with isn't finite!" | ||
| } | ||
|
|
||
| with(LocalDensity.current) { | ||
| // this loop will attempt to quickly find the correct size font by scaling it by the error | ||
| // it only runs if the max font size isn't specified or the font must be smaller | ||
| // minIntrinsicWidth is "The width for text if all soft wrap opportunities were taken." | ||
| if (maxFontSize.isUnspecified || targetWidth < intrinsics.minIntrinsicWidth.toDp()) { | ||
| while ((targetWidth - intrinsics.minIntrinsicWidth.toDp()).toPx().absoluteValue.toDp() > acceptableError / 2f) { | ||
| shrunkFontSize *= targetWidth.toPx() / intrinsics.minIntrinsicWidth | ||
| intrinsics = calculateIntrinsics() | ||
| } | ||
| } | ||
| // checks if the text fits in the bounds and scales it by 90% until it does | ||
| while (intrinsics.didExceedMaxLines || maxHeight < intrinsics.height.toDp() || maxWidth < intrinsics.minIntrinsicWidth.toDp()) { | ||
| shrunkFontSize *= 0.9f | ||
| intrinsics = calculateIntrinsics() | ||
| } | ||
| } | ||
|
|
||
| if (maxFontSize.isSpecified && shrunkFontSize > maxFontSize) { | ||
| shrunkFontSize = maxFontSize | ||
| } | ||
|
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| Text( | ||
| text = text, | ||
| color = color, | ||
| fontSize = shrunkFontSize, | ||
| fontStyle = fontStyle, | ||
| fontWeight = fontWeight, | ||
| fontFamily = fontFamily, | ||
| letterSpacing = letterSpacing, | ||
| textDecoration = textDecoration, | ||
| textAlign = textAlign, | ||
| lineHeight = lineHeight, | ||
| onTextLayout = onTextLayout, | ||
| maxLines = maxLines, | ||
| style = style, | ||
| ) | ||
| } | ||
| } |
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