Fix minimumFontScale with adjustsFontSizeToFit in the New Architecture
#58492
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,174 @@ | ||
| /* | ||
| * Copyright (c) Meta Platforms, Inc. and affiliates. | ||
| * | ||
| * This source code is licensed under the MIT license found in the | ||
| * LICENSE file in the root directory of this source tree. | ||
| */ | ||
|
|
||
| package com.facebook.react.views.text | ||
|
|
||
| import android.text.Layout | ||
| import android.text.SpannableString | ||
| import android.text.Spanned | ||
| import android.text.TextPaint | ||
| import com.facebook.react.common.ReactConstants | ||
| import com.facebook.react.uimanager.DisplayMetricsHolder | ||
| import com.facebook.react.uimanager.PixelUtil.dpToPx | ||
| import com.facebook.react.views.text.internal.span.ReactAbsoluteSizeSpan | ||
| import com.facebook.yoga.YogaMeasureMode | ||
| import org.assertj.core.api.Assertions.assertThat | ||
| import org.junit.After | ||
| import org.junit.Before | ||
| import org.junit.Test | ||
| import org.junit.runner.RunWith | ||
| import org.robolectric.RobolectricTestRunner | ||
| import org.robolectric.RuntimeEnvironment | ||
|
|
||
| @RunWith(RobolectricTestRunner::class) | ||
| class TextLayoutManagerMinimumFontScaleTest { | ||
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| @Before | ||
| fun setUp() { | ||
| DisplayMetricsHolder.initDisplayMetricsIfNotInitialized(RuntimeEnvironment.getApplication()) | ||
| } | ||
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| @After | ||
| fun tearDown() { | ||
| DisplayMetricsHolder.setScreenDisplayMetrics(null) | ||
| } | ||
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| @Test | ||
| fun `minimumFontScale limits how far the font shrinks relative to the largest font size`() { | ||
| val text = spannableWithFontSize(LARGE_FONT_SIZE) | ||
|
|
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| adjustToUnsatisfiableHeight(text, minimumFontScale = 0.5f) | ||
|
|
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| assertThat(largestFontSize(text)).isEqualTo((LARGE_FONT_SIZE * 0.5f).toInt()) | ||
| } | ||
|
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| @Test | ||
| fun `minimumFontScale is applied to the largest font size in the spannable`() { | ||
| val text = SpannableString("Small text and LARGE TEXT") | ||
| text.setSpan(ReactAbsoluteSizeSpan(SMALL_FONT_SIZE), 0, 14, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE) | ||
| text.setSpan( | ||
| ReactAbsoluteSizeSpan(LARGE_FONT_SIZE), | ||
| 15, | ||
| text.length, | ||
| Spanned.SPAN_EXCLUSIVE_EXCLUSIVE, | ||
| ) | ||
|
|
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| adjustToUnsatisfiableHeight(text, minimumFontScale = 0.5f) | ||
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| assertThat(largestFontSize(text)).isEqualTo((LARGE_FONT_SIZE * 0.5f).toInt()) | ||
| } | ||
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| @Test | ||
| fun `missing minimumFontScale shrinks down to the 4dp floor`() { | ||
| val text = spannableWithFontSize(LARGE_FONT_SIZE) | ||
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| adjustToUnsatisfiableHeight(text, minimumFontScale = Float.NaN) | ||
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| assertThat(largestFontSize(text)).isEqualTo(4.dpToPx().toInt()) | ||
| } | ||
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| @Test | ||
| fun `zero minimumFontScale shrinks down to the 4dp floor`() { | ||
| val text = spannableWithFontSize(LARGE_FONT_SIZE) | ||
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| adjustToUnsatisfiableHeight(text, minimumFontScale = 0f) | ||
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| assertThat(largestFontSize(text)).isEqualTo(4.dpToPx().toInt()) | ||
| } | ||
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| @Test | ||
| fun `minimumFontScale never shrinks below the 4dp floor`() { | ||
| val text = spannableWithFontSize(LARGE_FONT_SIZE) | ||
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| adjustToUnsatisfiableHeight(text, minimumFontScale = 0.01f) | ||
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| assertThat(largestFontSize(text)).isEqualTo(4.dpToPx().toInt()) | ||
| } | ||
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| @Test | ||
| fun `explicit minimumFontSize is used as the floor`() { | ||
| val text = spannableWithFontSize(LARGE_FONT_SIZE) | ||
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| adjustToUnsatisfiableHeight(text, minimumFontSize = 12f, minimumFontScale = Float.NaN) | ||
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| assertThat(largestFontSize(text)).isEqualTo(12) | ||
| } | ||
|
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| @Test | ||
| fun `explicit minimumFontSize takes precedence over minimumFontScale`() { | ||
| val text = spannableWithFontSize(LARGE_FONT_SIZE) | ||
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| adjustToUnsatisfiableHeight(text, minimumFontSize = 12f, minimumFontScale = 0.5f) | ||
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| assertThat(largestFontSize(text)).isEqualTo(12) | ||
| } | ||
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| @Test | ||
| fun `text that already fits is not shrunk`() { | ||
| val text = spannableWithFontSize(LARGE_FONT_SIZE) | ||
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| TextLayoutManager.adjustSpannableFontToFit( | ||
| text, | ||
| 10_000f, | ||
| YogaMeasureMode.EXACTLY, | ||
| 10_000f, | ||
| YogaMeasureMode.EXACTLY, | ||
| Float.NaN, | ||
| 0.5f, | ||
| ReactConstants.UNSET, | ||
| true, | ||
| Layout.BREAK_STRATEGY_SIMPLE, | ||
| Layout.HYPHENATION_FREQUENCY_NONE, | ||
| Layout.Alignment.ALIGN_NORMAL, | ||
| 0, | ||
| newPaint(), | ||
| ) | ||
|
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| assertThat(largestFontSize(text)).isEqualTo(LARGE_FONT_SIZE) | ||
| } | ||
|
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| // Uses a height no font size can satisfy so the text is shrunk all the way to the minimum. | ||
| private fun adjustToUnsatisfiableHeight( | ||
| text: SpannableString, | ||
| minimumFontScale: Float, | ||
| minimumFontSize: Float = Float.NaN, | ||
| ) { | ||
| TextLayoutManager.adjustSpannableFontToFit( | ||
| text, | ||
| 10_000f, | ||
| YogaMeasureMode.EXACTLY, | ||
| 1f, | ||
| YogaMeasureMode.EXACTLY, | ||
| minimumFontSize, | ||
| minimumFontScale, | ||
| ReactConstants.UNSET, | ||
| true, | ||
| Layout.BREAK_STRATEGY_SIMPLE, | ||
| Layout.HYPHENATION_FREQUENCY_NONE, | ||
| Layout.Alignment.ALIGN_NORMAL, | ||
| 0, | ||
| newPaint(), | ||
| ) | ||
| } | ||
|
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| private fun spannableWithFontSize(fontSize: Int): SpannableString { | ||
| val text = SpannableString("Hello") | ||
| text.setSpan(ReactAbsoluteSizeSpan(fontSize), 0, text.length, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE) | ||
| return text | ||
| } | ||
|
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| private fun newPaint(): TextPaint = | ||
| TextPaint(TextPaint.ANTI_ALIAS_FLAG).apply { textSize = LARGE_FONT_SIZE.toFloat() } | ||
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| private fun largestFontSize(text: Spanned): Int = | ||
| text.getSpans(0, text.length, ReactAbsoluteSizeSpan::class.java).maxOfOrNull { it.size } ?: 0 | ||
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| private companion object { | ||
| const val SMALL_FONT_SIZE = 10 | ||
| const val LARGE_FONT_SIZE = 40 | ||
| } | ||
| } |
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This is a public API change - please avoid. Can you add back the old API as deprecated?
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setMinimumFontSize()was added back as deprecated, andsetMinimumFontScale()was added alongside it.minimumFontSizestill takes precedence when explicitly set, so existing callers keep the old behavior.