From a0b47f3ca39f37bded5bcb704431021638196932 Mon Sep 17 00:00:00 2001
From: topjohnwu <topjohnwu@gmail.com>
Date: Mon, 29 Jun 2020 05:25:54 -0700
Subject: [PATCH] Precompute TextView in I/O thread for performance

---
 .../magisk/databinding/AdaptersGeneric.kt          | 14 ++++++++++++++
 app/src/main/res/layout/include_log_magisk.xml     |  2 +-
 2 files changed, 15 insertions(+), 1 deletion(-)

diff --git a/app/src/main/java/com/topjohnwu/magisk/databinding/AdaptersGeneric.kt b/app/src/main/java/com/topjohnwu/magisk/databinding/AdaptersGeneric.kt
index 0038cb7af..f845545b2 100644
--- a/app/src/main/java/com/topjohnwu/magisk/databinding/AdaptersGeneric.kt
+++ b/app/src/main/java/com/topjohnwu/magisk/databinding/AdaptersGeneric.kt
@@ -1,9 +1,14 @@
 package com.topjohnwu.magisk.databinding
 
 import android.view.View
+import android.widget.TextView
+import androidx.core.text.PrecomputedTextCompat
 import androidx.core.view.isGone
 import androidx.core.view.isInvisible
+import androidx.core.widget.TextViewCompat
 import androidx.databinding.BindingAdapter
+import com.topjohnwu.magisk.extensions.subscribeK
+import io.reactivex.Single
 
 @BindingAdapter("gone")
 fun setGone(view: View, gone: Boolean) {
@@ -24,3 +29,12 @@ fun setGoneUnless(view: View, goneUnless: Boolean) {
 fun setInvisibleUnless(view: View, invisibleUnless: Boolean) {
     setInvisible(view, invisibleUnless.not())
 }
+
+@BindingAdapter("precomputedText")
+fun setPrecomputedText(tv: TextView, text: CharSequence) {
+    Single.fromCallable {
+        PrecomputedTextCompat.create(text, TextViewCompat.getTextMetricsParams(tv))
+    }.subscribeK {
+        TextViewCompat.setPrecomputedText(tv, it);
+    }
+}
diff --git a/app/src/main/res/layout/include_log_magisk.xml b/app/src/main/res/layout/include_log_magisk.xml
index e481f314a..2fa83e3f6 100644
--- a/app/src/main/res/layout/include_log_magisk.xml
+++ b/app/src/main/res/layout/include_log_magisk.xml
@@ -27,7 +27,7 @@
                     android:layout_width="wrap_content"
                     android:layout_height="wrap_content"
                     android:fontFamily="monospace"
-                    android:text="@{viewModel.consoleText}"
+                    precomputedText="@{viewModel.consoleText}"
                     android:textAppearance="@style/AppearanceFoundation.Caption"
                     android:textSize="10sp"
                     android:paddingTop="@{viewModel.insets.top + (int) @dimen/internal_action_bar_size}"