From 0912962f0e78a31fe24b955949543b75678d651c Mon Sep 17 00:00:00 2001
From: HuanCheng65 <22636177+HuanCheng65@users.noreply.github.com>
Date: Fri, 10 Mar 2023 14:39:20 +0800
Subject: [PATCH] =?UTF-8?q?pref:=20=E4=BC=98=E5=8C=96=20DataStore?=
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---
 .../com/huanchengfly/tieba/post/DataStore.kt  | 45 +++++++++++--------
 1 file changed, 26 insertions(+), 19 deletions(-)

diff --git a/app/src/main/java/com/huanchengfly/tieba/post/DataStore.kt b/app/src/main/java/com/huanchengfly/tieba/post/DataStore.kt
index 74358169..99410629 100644
--- a/app/src/main/java/com/huanchengfly/tieba/post/DataStore.kt
+++ b/app/src/main/java/com/huanchengfly/tieba/post/DataStore.kt
@@ -22,31 +22,38 @@ object DataStoreConst {
     const val DATA_STORE_NAME = "app_preferences"
 }
 
-val Context.dataStore: DataStore<Preferences> by preferencesDataStore(
-    name = DataStoreConst.DATA_STORE_NAME,
-    produceMigrations = { context ->
-        listOf(
-            SharedPreferencesMigration(context, "settings"),
-            object : DataMigration<Preferences> {
-                override suspend fun cleanUp() {}
+private val dataStoreInstance by lazy(mode = LazyThreadSafetyMode.SYNCHRONIZED) {
+    preferencesDataStore(
+        name = DataStoreConst.DATA_STORE_NAME,
+        produceMigrations = { context ->
+            listOf(
+                SharedPreferencesMigration(context, "settings"),
+                object : DataMigration<Preferences> {
+                    override suspend fun cleanUp() {}
 
-                override suspend fun migrate(currentData: Preferences): Preferences {
-                    return currentData.toMutablePreferences().apply {
-                        set(stringPreferencesKey("dark_theme"), "grey_dark")
-                    }.toPreferences()
-                }
+                    override suspend fun migrate(currentData: Preferences): Preferences {
+                        return currentData.toMutablePreferences().apply {
+                            set(stringPreferencesKey("dark_theme"), "grey_dark")
+                        }.toPreferences()
+                    }
 
-                override suspend fun shouldMigrate(currentData: Preferences): Boolean {
-                    return currentData[stringPreferencesKey("dark_theme")] == "dark"
+                    override suspend fun shouldMigrate(currentData: Preferences): Boolean {
+                        return currentData[stringPreferencesKey("dark_theme")] == "dark"
+                    }
                 }
-            }
-        )
-    }
-)
+            )
+        }
+    )
+}
+
+val Context.dataStore: DataStore<Preferences> by dataStoreInstance
 
 @SuppressLint("FlowOperatorInvokedInComposition")
 @Composable
-fun <T> DataStore<Preferences>.collectPreferenceAsState(key: Preferences.Key<T>, defaultValue: T): State<T> {
+fun <T> DataStore<Preferences>.collectPreferenceAsState(
+    key: Preferences.Key<T>,
+    defaultValue: T
+): State<T> {
     return data.map { it[key] ?: defaultValue }.collectAsState(initial = defaultValue)
 }