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Migrate com.facebook.react.views.text.FontMetricsUtil to Kotlin (#47510)
Summary: Pull Request resolved: https://github.com/facebook/react-native/pull/47510 As per title. Changelog: [Internal] Reviewed By: tdn120 Differential Revision: D65598073 fbshipit-source-id: 401750f2df9bd434a8310f107f46a686bfa6601c
This commit is contained in:
Fabrizio Cucci
committed by
Facebook GitHub Bot
Facebook GitHub Bot
parent
e64513bf4e
commit
697a422bf5
@@ -7200,9 +7200,9 @@ public final class com/facebook/react/views/text/DefaultStyleValuesUtil {
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public static final fun getDefaultTextColorHint (Landroid/content/Context;)Landroid/content/res/ColorStateList;
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}
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public class com/facebook/react/views/text/FontMetricsUtil {
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public fun <init> ()V
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public static fun getFontMetrics (Ljava/lang/CharSequence;Landroid/text/Layout;Landroid/text/TextPaint;Landroid/content/Context;)Lcom/facebook/react/bridge/WritableArray;
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public final class com/facebook/react/views/text/FontMetricsUtil {
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public static final field INSTANCE Lcom/facebook/react/views/text/FontMetricsUtil;
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public static final fun getFontMetrics (Ljava/lang/CharSequence;Landroid/text/Layout;Landroid/text/TextPaint;Landroid/content/Context;)Lcom/facebook/react/bridge/WritableArray;
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}
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public abstract class com/facebook/react/views/text/ReactBaseTextShadowNode : com/facebook/react/uimanager/LayoutShadowNode {
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-65
@@ -1,65 +0,0 @@
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/*
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* Copyright (c) Meta Platforms, Inc. and affiliates.
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*
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* This source code is licensed under the MIT license found in the
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* LICENSE file in the root directory of this source tree.
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*/
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package com.facebook.react.views.text;
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import android.content.Context;
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import android.graphics.Rect;
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import android.text.Layout;
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import android.text.TextPaint;
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import android.util.DisplayMetrics;
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import com.facebook.react.bridge.Arguments;
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import com.facebook.react.bridge.WritableArray;
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import com.facebook.react.bridge.WritableMap;
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public class FontMetricsUtil {
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private static final String CAP_HEIGHT_MEASUREMENT_TEXT = "T";
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private static final String X_HEIGHT_MEASUREMENT_TEXT = "x";
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private static final float AMPLIFICATION_FACTOR = 100;
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public static WritableArray getFontMetrics(
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CharSequence text, Layout layout, TextPaint paint, Context context) {
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DisplayMetrics dm = context.getResources().getDisplayMetrics();
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WritableArray lines = Arguments.createArray();
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// To calculate xHeight and capHeight we have to render an "x" and "T" and manually measure
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// their height.
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// In order to get more precision than Android offers, we blow up the text size by 100 and
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// measure it.
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// Luckily, text size affects rendering linearly, so we can do this trick.
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TextPaint paintCopy = new TextPaint(paint);
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paintCopy.setTextSize(paintCopy.getTextSize() * AMPLIFICATION_FACTOR);
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Rect capHeightBounds = new Rect();
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paintCopy.getTextBounds(
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CAP_HEIGHT_MEASUREMENT_TEXT, 0, CAP_HEIGHT_MEASUREMENT_TEXT.length(), capHeightBounds);
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double capHeight = capHeightBounds.height() / AMPLIFICATION_FACTOR / dm.density;
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Rect xHeightBounds = new Rect();
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paintCopy.getTextBounds(
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X_HEIGHT_MEASUREMENT_TEXT, 0, X_HEIGHT_MEASUREMENT_TEXT.length(), xHeightBounds);
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double xHeight = xHeightBounds.height() / AMPLIFICATION_FACTOR / dm.density;
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for (int i = 0; i < layout.getLineCount(); i++) {
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boolean endsWithNewLine = text.length() > 0 && text.charAt(layout.getLineEnd(i) - 1) == '\n';
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float lineWidth = endsWithNewLine ? layout.getLineMax(i) : layout.getLineWidth(i);
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Rect bounds = new Rect();
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layout.getLineBounds(i, bounds);
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WritableMap line = Arguments.createMap();
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line.putDouble("x", layout.getLineLeft(i) / dm.density);
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line.putDouble("y", bounds.top / dm.density);
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line.putDouble("width", lineWidth / dm.density);
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line.putDouble("height", bounds.height() / dm.density);
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line.putDouble("descender", layout.getLineDescent(i) / dm.density);
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line.putDouble("ascender", -layout.getLineAscent(i) / dm.density);
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line.putDouble("baseline", layout.getLineBaseline(i) / dm.density);
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line.putDouble("capHeight", capHeight);
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line.putDouble("xHeight", xHeight);
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line.putString(
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"text", text.subSequence(layout.getLineStart(i), layout.getLineEnd(i)).toString());
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lines.pushMap(line);
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}
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return lines;
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}
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}
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+72
@@ -0,0 +1,72 @@
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/*
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* Copyright (c) Meta Platforms, Inc. and affiliates.
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*
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* This source code is licensed under the MIT license found in the
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* LICENSE file in the root directory of this source tree.
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*/
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package com.facebook.react.views.text
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import android.content.Context
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import android.graphics.Rect
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import android.text.Layout
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import android.text.TextPaint
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import com.facebook.react.bridge.Arguments
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import com.facebook.react.bridge.WritableArray
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public object FontMetricsUtil {
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private const val CAP_HEIGHT_MEASUREMENT_TEXT = "T"
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private const val X_HEIGHT_MEASUREMENT_TEXT = "x"
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private const val AMPLIFICATION_FACTOR = 100f
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@JvmStatic
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public fun getFontMetrics(
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text: CharSequence,
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layout: Layout,
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paint: TextPaint,
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context: Context
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): WritableArray {
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val dm = context.resources.displayMetrics
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val lines = Arguments.createArray()
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// To calculate xHeight and capHeight we have to render an "x" and "T" and manually measure
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// their height. In order to get more precision than Android offers, we blow up the text size by
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// 100 and
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// measure it. Luckily, text size affects rendering linearly, so we can do this trick.
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val paintCopy = TextPaint(paint).apply { textSize *= AMPLIFICATION_FACTOR }
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val capHeightBounds = Rect()
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paintCopy.getTextBounds(
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CAP_HEIGHT_MEASUREMENT_TEXT, 0, CAP_HEIGHT_MEASUREMENT_TEXT.length, capHeightBounds)
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val capHeight = capHeightBounds.height() / AMPLIFICATION_FACTOR / dm.density
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val xHeightBounds = Rect()
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paintCopy.getTextBounds(
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X_HEIGHT_MEASUREMENT_TEXT, 0, X_HEIGHT_MEASUREMENT_TEXT.length, xHeightBounds)
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val xHeight = xHeightBounds.height() / AMPLIFICATION_FACTOR / dm.density
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for (i in 0 until layout.lineCount) {
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val endsWithNewLine = text.isNotEmpty() && text[layout.getLineEnd(i) - 1] == '\n'
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val lineWidth = if (endsWithNewLine) layout.getLineMax(i) else layout.getLineWidth(i)
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val bounds = Rect()
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layout.getLineBounds(i, bounds)
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val line =
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Arguments.createMap().apply {
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putDouble("x", (layout.getLineLeft(i) / dm.density).toDouble())
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putDouble("y", (bounds.top / dm.density).toDouble())
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putDouble("width", (lineWidth / dm.density).toDouble())
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putDouble("height", (bounds.height() / dm.density).toDouble())
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putDouble("descender", (layout.getLineDescent(i) / dm.density).toDouble())
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putDouble("ascender", (-layout.getLineAscent(i) / dm.density).toDouble())
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putDouble("baseline", (layout.getLineBaseline(i) / dm.density).toDouble())
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putDouble("capHeight", capHeight.toDouble())
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putDouble("xHeight", xHeight.toDouble())
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putString(
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"text", text.subSequence(layout.getLineStart(i), layout.getLineEnd(i)).toString())
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}
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lines.pushMap(line)
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}
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return lines
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}
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}
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