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Implement adjustsFontSizeToFit on Android (#26389)
Summary: This adds support for `adjustsFontSizeToFit` and `minimumFontScale` on Android. The implementation tries to match closely the behaviour on iOS (hardcoded 4px min size for example). It uses a simpler linear algorithm for now, opened to improving it now if it is a deal breaker or in a follow up. See https://twitter.com/janicduplessis/status/1171147709979516929 for a more detailed thread about the implementation ## Changelog [Android] [Added] - Implement `adjustsFontSizeToFit` on Android Pull Request resolved: #26389 Test Plan: Tested by adding the existing `adjustsFontSizeToFit` example from the iOS text page to android. Also added a case for limiting size by using `maxHeight` instead of `numberOfLines`. Reviewed By: mdvacca Differential Revision: D17285473 Pulled By: JoshuaGross fbshipit-source-id: 43dbdb05e2d6418e9a390d11f921518bfa58e697
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‎RNTester/js/examples/Text/TextExample.android.js

+128-1
Original file line numberDiff line numberDiff line change
@@ -16,7 +16,7 @@ const React = require('react');
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const TextInlineView = require('../../components/TextInlineView');
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const TextLegend = require('../../components/TextLegend');
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const {StyleSheet, Text, View} = require('react-native');
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const {LayoutAnimation, StyleSheet, Text, View} = require('react-native');
2020

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class Entity extends React.Component<{|children: React.Node|}> {
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render() {
@@ -70,10 +70,137 @@ class AttributeToggler extends React.Component<{...}, $FlowFixMeState> {
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}
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}
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type AdjustingFontSizeProps = $ReadOnly<{||}>;
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type AdjustingFontSizeState = {|
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dynamicText: string,
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shouldRender: boolean,
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|};
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class AdjustingFontSize extends React.Component<
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AdjustingFontSizeProps,
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AdjustingFontSizeState,
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> {
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state = {
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dynamicText: '',
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shouldRender: true,
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};
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reset = () => {
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LayoutAnimation.easeInEaseOut();
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this.setState({
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shouldRender: false,
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});
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setTimeout(() => {
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LayoutAnimation.easeInEaseOut();
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this.setState({
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dynamicText: '',
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shouldRender: true,
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});
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}, 300);
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};
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addText = () => {
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this.setState({
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dynamicText:
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this.state.dynamicText +
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(Math.floor((Math.random() * 10) % 2) ? ' foo' : ' bar'),
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});
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};
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removeText = () => {
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this.setState({
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dynamicText: this.state.dynamicText.slice(
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0,
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this.state.dynamicText.length - 4,
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),
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});
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};
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render() {
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if (!this.state.shouldRender) {
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return <View />;
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}
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return (
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<View>
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<Text
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ellipsizeMode="tail"
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numberOfLines={1}
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style={{fontSize: 36, marginVertical: 6}}>
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Truncated text is baaaaad.
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</Text>
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<Text
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numberOfLines={1}
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adjustsFontSizeToFit={true}
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style={{fontSize: 40, marginVertical: 6}}>
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Shrinking to fit available space is much better!
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</Text>
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<Text
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adjustsFontSizeToFit={true}
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numberOfLines={1}
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style={{fontSize: 30, marginVertical: 6}}>
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{'Add text to me to watch me shrink!' + ' ' + this.state.dynamicText}
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</Text>
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<Text
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adjustsFontSizeToFit={true}
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numberOfLines={4}
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style={{fontSize: 20, marginVertical: 6}}>
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{'Multiline text component shrinking is supported, watch as this reeeeaaaally loooooong teeeeeeext grooooows and then shriiiinks as you add text to me! ioahsdia soady auydoa aoisyd aosdy ' +
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' ' +
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this.state.dynamicText}
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</Text>
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<Text
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adjustsFontSizeToFit={true}
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style={{fontSize: 20, marginVertical: 6, maxHeight: 50}}>
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{'Text limited by height, watch as this reeeeaaaally loooooong teeeeeeext grooooows and then shriiiinks as you add text to me! ioahsdia soady auydoa aoisyd aosdy ' +
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' ' +
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this.state.dynamicText}
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</Text>
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<Text
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adjustsFontSizeToFit={true}
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numberOfLines={1}
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style={{marginVertical: 6}}>
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<Text style={{fontSize: 14}}>
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{'Differently sized nested elements will shrink together. '}
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</Text>
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<Text style={{fontSize: 20}}>
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{'LARGE TEXT! ' + this.state.dynamicText}
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</Text>
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</Text>
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<View
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style={{
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flexDirection: 'row',
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justifyContent: 'space-around',
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marginTop: 5,
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marginVertical: 6,
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}}>
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<Text style={{backgroundColor: '#ffaaaa'}} onPress={this.reset}>
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Reset
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</Text>
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<Text style={{backgroundColor: '#aaaaff'}} onPress={this.removeText}>
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Remove Text
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</Text>
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<Text style={{backgroundColor: '#aaffaa'}} onPress={this.addText}>
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Add Text
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</Text>
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</View>
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</View>
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);
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}
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}
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class TextExample extends React.Component<{...}> {
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render(): React.Node {
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return (
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<RNTesterPage title="<Text>">
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<RNTesterBlock title="Dynamic Font Size Adjustment">
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<AdjustingFontSize />
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</RNTesterBlock>
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<RNTesterBlock title="Wrap">
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<Text>
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The text should wrap if it goes on multiple lines. See, this is

‎RNTester/js/examples/Text/TextExample.ios.js

+8
Original file line numberDiff line numberDiff line change
@@ -222,6 +222,14 @@ class AdjustingFontSize extends React.Component<
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this.state.dynamicText}
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</Text>
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<Text
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adjustsFontSizeToFit={true}
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style={{fontSize: 20, marginVertical: 6, maxHeight: 50}}>
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{'Text limited by height, watch as this reeeeaaaally loooooong teeeeeeext grooooows and then shriiiinks as you add text to me! ioahsdia soady auydoa aoisyd aosdy ' +
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' ' +
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this.state.dynamicText}
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</Text>
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<Text
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adjustsFontSizeToFit={true}
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numberOfLines={1}

‎ReactAndroid/src/main/java/com/facebook/react/uimanager/ViewProps.java

+2
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@@ -90,6 +90,8 @@ public class ViewProps {
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public static final String NEEDS_OFFSCREEN_ALPHA_COMPOSITING = "needsOffscreenAlphaCompositing";
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public static final String NUMBER_OF_LINES = "numberOfLines";
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public static final String ELLIPSIZE_MODE = "ellipsizeMode";
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public static final String ADJUSTS_FONT_SIZE_TO_FIT = "adjustsFontSizeToFit";
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public static final String MINIMUM_FONT_SCALE = "minimumFontScale";
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public static final String ON = "on";
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public static final String RESIZE_MODE = "resizeMode";
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public static final String RESIZE_METHOD = "resizeMethod";

‎ReactAndroid/src/main/java/com/facebook/react/views/text/ReactBaseTextShadowNode.java

+18-1
Original file line numberDiff line numberDiff line change
@@ -337,7 +337,6 @@ protected Spannable spannedFromShadowNode(
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(Build.VERSION.SDK_INT < Build.VERSION_CODES.M) ? 0 : Layout.HYPHENATION_FREQUENCY_NONE;
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protected int mJustificationMode =
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(Build.VERSION.SDK_INT < Build.VERSION_CODES.O) ? 0 : Layout.JUSTIFICATION_MODE_NONE;
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protected TextTransform mTextTransform = TextTransform.UNSET;
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protected float mTextShadowOffsetDx = 0;
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protected float mTextShadowOffsetDy = 0;
@@ -347,6 +346,8 @@ protected Spannable spannedFromShadowNode(
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protected boolean mIsUnderlineTextDecorationSet = false;
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protected boolean mIsLineThroughTextDecorationSet = false;
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protected boolean mIncludeFontPadding = true;
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protected boolean mAdjustsFontSizeToFit = false;
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protected float mMinimumFontScale = 0;
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/**
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* mFontStyle can be {@link Typeface#NORMAL} or {@link Typeface#ITALIC}. mFontWeight can be {@link
@@ -627,4 +628,20 @@ public void setTextTransform(@Nullable String textTransform) {
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}
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markUpdated();
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}
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@ReactProp(name = ViewProps.ADJUSTS_FONT_SIZE_TO_FIT)
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public void setAdjustFontSizeToFit(boolean adjustsFontSizeToFit) {
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if (adjustsFontSizeToFit != mAdjustsFontSizeToFit) {
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mAdjustsFontSizeToFit = adjustsFontSizeToFit;
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markUpdated();
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}
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}
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@ReactProp(name = ViewProps.MINIMUM_FONT_SCALE)
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public void setMinimumFontScale(float minimumFontScale) {
642+
if (minimumFontScale != mMinimumFontScale) {
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mMinimumFontScale = minimumFontScale;
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markUpdated();
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}
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}
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}

‎ReactAndroid/src/main/java/com/facebook/react/views/text/ReactTextAnchorViewManager.java

+5
Original file line numberDiff line numberDiff line change
@@ -60,6 +60,11 @@ public void setEllipsizeMode(ReactTextView view, @Nullable String ellipsizeMode)
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}
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}
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@ReactProp(name = ViewProps.ADJUSTS_FONT_SIZE_TO_FIT)
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public void setAdjustFontSizeToFit(ReactTextView view, boolean adjustsFontSizeToFit) {
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view.setAdjustFontSizeToFit(adjustsFontSizeToFit);
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}
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@ReactProp(name = ViewProps.TEXT_ALIGN_VERTICAL)
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public void setTextAlignVertical(ReactTextView view, @Nullable String textAlignVertical) {
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if (textAlignVertical == null || "auto".equals(textAlignVertical)) {

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