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Android textTransform style support (#20572)
Summary: Issue #2088 (closed, but a bit pre-emptively imo, since Android support was skipped) Related (merged) iOS PR #18387 Related documentation PR facebook/react-native-website#500 The basic desire is to have a declarative mechanism to transform text content to uppercase or lowercase or titlecase ("capitalized"). Pull Request resolved: #20572 Differential Revision: D9311716 Pulled By: hramos fbshipit-source-id: dfbb855117196958e7ae5e980700d31be07a448d
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83 changes: 83 additions & 0 deletions
83
ReactAndroid/src/main/java/com/facebook/react/views/text/CustomTextTransformSpan.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,83 @@ | ||
| /** | ||
| * Copyright (c) 2015-present, Facebook, Inc. | ||
| * | ||
| * This source code is licensed under the MIT license found in the | ||
| * LICENSE file in the root directory of this source tree. | ||
| */ | ||
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| package com.facebook.react.views.text; | ||
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| import android.graphics.Canvas; | ||
| import android.graphics.Paint; | ||
| import android.text.style.ReplacementSpan; | ||
| import java.text.BreakIterator; | ||
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| public class CustomTextTransformSpan extends ReplacementSpan { | ||
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| /** | ||
| * A {@link ReplacementSpan} that allows declarative changing of text casing. | ||
| * CustomTextTransformSpan will change e.g. "foo" to "FOO", when passed UPPERCASE. | ||
| * | ||
| * This needs to be a Span in order to achieve correctly nested transforms | ||
| * (for Text nodes within Text nodes, each with separate needed transforms) | ||
| */ | ||
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| private final TextTransform mTransform; | ||
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| public CustomTextTransformSpan(TextTransform transform) { | ||
| mTransform = transform; | ||
| } | ||
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| @Override | ||
| public void draw(Canvas canvas, CharSequence text, int start, int end, float x, int top, int y, int bottom, Paint paint) { | ||
| CharSequence transformedText = transformText(text); | ||
| canvas.drawText(transformedText, start, end, x, y, paint); | ||
| } | ||
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| @Override | ||
| public int getSize(Paint paint, CharSequence text, int start, int end, Paint.FontMetricsInt fm) { | ||
| CharSequence transformedText = transformText(text); | ||
| return Math.round(paint.measureText(transformedText, start, end)); | ||
| } | ||
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| private CharSequence transformText(CharSequence text) { | ||
| CharSequence transformed; | ||
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| switch(mTransform) { | ||
| case UPPERCASE: | ||
| transformed = (CharSequence) text.toString().toUpperCase(); | ||
| break; | ||
| case LOWERCASE: | ||
| transformed = (CharSequence) text.toString().toLowerCase(); | ||
| break; | ||
| case CAPITALIZE: | ||
| transformed = (CharSequence) capitalize(text.toString()); | ||
| break; | ||
| default: | ||
| transformed = text; | ||
| } | ||
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| return transformed; | ||
| } | ||
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| private String capitalize(String text) { | ||
| BreakIterator wordIterator = BreakIterator.getWordInstance(); | ||
| wordIterator.setText(text); | ||
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| StringBuilder res = new StringBuilder(text.length()); | ||
| int start = wordIterator.first(); | ||
| for (int end = wordIterator.next(); end != BreakIterator.DONE; end = wordIterator.next()) { | ||
| String word = text.substring(start, end); | ||
| if (Character.isLetterOrDigit(word.charAt(0))) { | ||
| res.append(Character.toUpperCase(word.charAt(0))); | ||
| res.append(word.substring(1).toLowerCase()); | ||
| } else { | ||
| res.append(word); | ||
| } | ||
| start = end; | ||
| } | ||
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| return res.toString(); | ||
| } | ||
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| } |
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13
ReactAndroid/src/main/java/com/facebook/react/views/text/TextTransform.java
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,13 @@ | ||
| /** | ||
| * Copyright (c) 2015-present, Facebook, Inc. | ||
| * | ||
| * This source code is licensed under the MIT license found in the | ||
| * LICENSE file in the root directory of this source tree. | ||
| */ | ||
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| package com.facebook.react.views.text; | ||
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| /** | ||
| * Types of text transforms for CustomTextTransformSpan | ||
| */ | ||
| public enum TextTransform { NONE, UPPERCASE, LOWERCASE, CAPITALIZE, UNSET }; |
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