From e89d23c9f4853b285cf20ca9fcf473c9bcda308e Mon Sep 17 00:00:00 2001
From: Nick Gerleman <ngerlem@meta.com>
Date: Fri, 24 Mar 2023 12:31:22 -0700
Subject: [PATCH] Minimize EditText Spans 6/9: letterSpacing (#36548)

Summary:
Pull Request resolved: https://github.com/facebook/react-native/pull/36548

This is part of a series of changes to minimize the number of spans committed to EditText, as a mitigation for platform issues on Samsung devices. See this [GitHub thread]( https://github.com/facebook/react-native/issues/35936#issuecomment-1411437789) for greater context on the platform behavior.

This change lets us set `letterSpacing` on the EditText instead of using our custom span.

Changelog:
[Android][Fixed] - Minimize EditText Spans 6/N: letterSpacing

Reviewed By: rshest

Differential Revision: D44240777

fbshipit-source-id: 9bd10c3261257037d8cacf37971011aaa94d1a77
---
 .../views/text/CustomLetterSpacingSpan.java   |  4 ++++
 .../react/views/textinput/ReactEditText.java  | 23 ++++++++++++++++++-
 2 files changed, 26 insertions(+), 1 deletion(-)

diff --git a/ReactAndroid/src/main/java/com/facebook/react/views/text/CustomLetterSpacingSpan.java b/ReactAndroid/src/main/java/com/facebook/react/views/text/CustomLetterSpacingSpan.java
index 3b9cf58e33d3a1..d537cd5dccc101 100644
--- a/ReactAndroid/src/main/java/com/facebook/react/views/text/CustomLetterSpacingSpan.java
+++ b/ReactAndroid/src/main/java/com/facebook/react/views/text/CustomLetterSpacingSpan.java
@@ -37,6 +37,10 @@ public void updateMeasureState(TextPaint paint) {
     apply(paint);
   }
 
+  public float getSpacing() {
+    return mLetterSpacing;
+  }
+
   private void apply(TextPaint paint) {
     if (!Float.isNaN(mLetterSpacing)) {
       paint.setLetterSpacing(mLetterSpacing);
diff --git a/ReactAndroid/src/main/java/com/facebook/react/views/textinput/ReactEditText.java b/ReactAndroid/src/main/java/com/facebook/react/views/textinput/ReactEditText.java
index 36a0a3da104392..fe6a3b14693e99 100644
--- a/ReactAndroid/src/main/java/com/facebook/react/views/textinput/ReactEditText.java
+++ b/ReactAndroid/src/main/java/com/facebook/react/views/textinput/ReactEditText.java
@@ -726,6 +726,18 @@ public boolean test(ReactUnderlineSpan span) {
             return (getPaintFlags() & Paint.UNDERLINE_TEXT_FLAG) != 0;
           }
         });
+
+    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
+      stripSpansOfKind(
+          sb,
+          CustomLetterSpacingSpan.class,
+          new SpanPredicate<CustomLetterSpacingSpan>() {
+            @Override
+            public boolean test(CustomLetterSpacingSpan span) {
+              return span.getSpacing() == mTextAttributes.getEffectiveLetterSpacing();
+            }
+          });
+    }
   }
 
   private <T> void stripSpansOfKind(
@@ -767,6 +779,13 @@ private void restoreStyleEquivalentSpans(SpannableStringBuilder workingText) {
       spans.add(new ReactUnderlineSpan());
     }
 
+    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
+      float effectiveLetterSpacing = mTextAttributes.getEffectiveLetterSpacing();
+      if (!Float.isNaN(effectiveLetterSpacing)) {
+        spans.add(new CustomLetterSpacingSpan(effectiveLetterSpacing));
+      }
+    }
+
     for (Object span : spans) {
       workingText.setSpan(span, 0, workingText.length(), spanFlags);
     }
@@ -1119,7 +1138,9 @@ protected void applyTextAttributes() {
 
     float effectiveLetterSpacing = mTextAttributes.getEffectiveLetterSpacing();
     if (!Float.isNaN(effectiveLetterSpacing)) {
-      setLetterSpacing(effectiveLetterSpacing);
+      if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
+        setLetterSpacing(effectiveLetterSpacing);
+      }
     }
   }