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Merge pull request #891 from mannodermaus/fix/top-bar-text-break-in-l…
…arge-font-size Introduce auto sizing for all app bar title components
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...c/commonMain/kotlin/io/github/droidkaigi/confsched/designsystem/component/AutoSizeText.kt
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,127 @@ | ||
| package io.github.droidkaigi.confsched.designsystem.component | ||
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|
||
| import androidx.compose.foundation.layout.BoxWithConstraints | ||
| import androidx.compose.foundation.layout.BoxWithConstraintsScope | ||
| import androidx.compose.material3.LocalTextStyle | ||
| import androidx.compose.material3.Text | ||
| import androidx.compose.runtime.Composable | ||
| import androidx.compose.runtime.remember | ||
| 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.semantics.semantics | ||
| import androidx.compose.ui.text.Paragraph | ||
| import androidx.compose.ui.text.TextStyle | ||
| import androidx.compose.ui.text.style.TextAlign | ||
| import androidx.compose.ui.unit.Constraints | ||
| import androidx.compose.ui.unit.TextUnit | ||
| import androidx.compose.ui.unit.TextUnitType | ||
| import androidx.compose.ui.unit.em | ||
| import androidx.compose.ui.unit.sp | ||
| import kotlin.math.ceil | ||
|
|
||
| /** | ||
| * A [Text] component that automatically downsizes its font size to fit its content, | ||
| * with the upper bound being defined by the font size of its [style]. | ||
| */ | ||
| @Composable | ||
| fun AutoSizeText( | ||
| text: String, | ||
| modifier: Modifier = Modifier, | ||
| textAlign: TextAlign = TextAlign.Unspecified, | ||
| maxLines: Int = Int.MAX_VALUE, | ||
| style: TextStyle = LocalTextStyle.current, | ||
| color: Color = Color.Unspecified, | ||
| ) { | ||
| BoxWithConstraints( | ||
| modifier = modifier.semantics(mergeDescendants = true) {}, | ||
| contentAlignment = when (textAlign) { | ||
| TextAlign.Left, TextAlign.Start -> Alignment.CenterStart | ||
| TextAlign.Center -> Alignment.Center | ||
| TextAlign.Right, TextAlign.End -> Alignment.CenterEnd | ||
| TextAlign.Justify -> Alignment.Center | ||
| else -> Alignment.CenterStart | ||
| }, | ||
| ) { | ||
| Text( | ||
| text = text, | ||
| color = color, | ||
| fontSize = rememberFontSize(text, style, color, textAlign, maxLines), | ||
| style = style, | ||
| maxLines = maxLines, | ||
| textAlign = textAlign, | ||
| ) | ||
| } | ||
| } | ||
|
|
||
| @Composable | ||
| private fun BoxWithConstraintsScope.rememberFontSize( | ||
| text: String, | ||
| style: TextStyle, | ||
| color: Color, | ||
| textAlign: TextAlign, | ||
| maxLines: Int, | ||
| ): TextUnit { | ||
| val density = LocalDensity.current | ||
| val fontFamilyResolver = LocalFontFamilyResolver.current | ||
|
|
||
| return remember(text, style.fontSize, textAlign, maxLines, density, maxWidth, maxHeight) { | ||
| // Helper function to calculate if a given text size | ||
| // would cause an overflow when placed into this BoxWithConstraints | ||
| val hasOverflowWhenPlaced: TextUnit.() -> Boolean = { | ||
| val finalStyle = style.merge( | ||
| TextStyle( | ||
| color = color, | ||
| fontSize = this, | ||
| textAlign = textAlign, | ||
| ), | ||
| ) | ||
|
|
||
| with(density) { | ||
| Paragraph( | ||
| text = text, | ||
| style = finalStyle, | ||
| maxLines = maxLines, | ||
| constraints = Constraints(maxWidth = ceil(maxWidth.toPx()).toInt()), | ||
| density = this, | ||
| fontFamilyResolver = fontFamilyResolver, | ||
| ).run { | ||
| didExceedMaxLines || maxHeight < height.toDp() || maxWidth < minIntrinsicWidth.toDp() | ||
| } | ||
| } | ||
| } | ||
|
|
||
| // If the original text size fits already without overflowing, | ||
| // then there is no need to do anything | ||
| if (!style.fontSize.hasOverflowWhenPlaced()) { | ||
| return@remember style.fontSize | ||
| } | ||
|
|
||
| // Otherwise, find the biggest font size that still fits using binary search | ||
| var lo = 1 | ||
| var hi = style.fontSize.value.toInt() | ||
| val type = style.fontSize.type | ||
|
|
||
| while (lo <= hi) { | ||
| val mid = lo + (hi - lo) / 2 | ||
| if (mid.asTextUnit(type).hasOverflowWhenPlaced()) { | ||
| hi = mid - 1 | ||
| } else { | ||
| lo = mid + 1 | ||
| } | ||
| } | ||
|
|
||
| // After the binary search, the right pointer is the largest size | ||
| // that still works without overflowing the box | ||
| hi.asTextUnit(type) | ||
| } | ||
| } | ||
|
|
||
| private fun Int.asTextUnit(type: TextUnitType) = when (type) { | ||
| TextUnitType.Sp -> this.sp | ||
| TextUnitType.Em -> this.em | ||
| TextUnitType.Unspecified -> TextUnit.Unspecified | ||
| else -> error("Invalid TextUnitType: $type") | ||
| } |
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