Migrate custom emoji prefs to repo pattern (#2767)

app/src/main/java/com/geeksville/mesh/ui/common/EmojiPickerViewModel.kt

@@ -0,0 +1,33 @@
+/*
+ * Copyright (c) 2025 Meshtastic LLC
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package com.geeksville.mesh.ui.common
+
+import androidx.lifecycle.ViewModel
+import com.geeksville.mesh.android.prefs.CustomEmojiPrefs
+import dagger.hilt.android.lifecycle.HiltViewModel
+import javax.inject.Inject
+
+@HiltViewModel
+class EmojiPickerViewModel @Inject constructor(private val customEmojiPrefs: CustomEmojiPrefs) : ViewModel() {
+
+    var customEmojiFrequency: String?
+        get() = customEmojiPrefs.customEmojiFrequency
+        set(value) {
+            customEmojiPrefs.customEmojiFrequency = value
+        }
+}

app/src/main/java/com/geeksville/mesh/ui/common/components/EmojiPicker.kt

@@ -28,17 +28,29 @@ import androidx.compose.runtime.Composable
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.viewinterop.AndroidView
 import androidx.emoji2.emojipicker.RecentEmojiProviderAdapter
+import androidx.hilt.navigation.compose.hiltViewModel
+import com.geeksville.mesh.ui.common.EmojiPickerViewModel
 import com.geeksville.mesh.util.CustomRecentEmojiProvider
 
 @Composable
-fun EmojiPicker(onDismiss: () -> Unit = {}, onConfirm: (String) -> Unit) {
+fun EmojiPicker(
+    viewModel: EmojiPickerViewModel = hiltViewModel(),
+    onDismiss: () -> Unit = {},
+    onConfirm: (String) -> Unit,
+) {
     Column(verticalArrangement = Arrangement.Bottom) {
         BackHandler { onDismiss() }
         AndroidView(
             factory = { context ->
                 androidx.emoji2.emojipicker.EmojiPickerView(context).apply {
                     clipToOutline = true
-                    setRecentEmojiProvider(RecentEmojiProviderAdapter(CustomRecentEmojiProvider(context)))
+                    setRecentEmojiProvider(
+                        RecentEmojiProviderAdapter(
+                            CustomRecentEmojiProvider(viewModel.customEmojiFrequency) { updatedValue ->
+                                viewModel.customEmojiFrequency = updatedValue
+                            },
+                        ),
+                    )
                     setOnEmojiPickedListener { emoji ->
                         onDismiss()
                         onConfirm(emoji.emoji)

app/src/main/java/com/geeksville/mesh/util/CustomRecentEmojiProvider.kt

@@ -17,19 +17,18 @@
 
 package com.geeksville.mesh.util
 
-import android.content.Context
 import androidx.emoji2.emojipicker.RecentEmojiAsyncProvider
 import com.google.common.util.concurrent.Futures
 import com.google.common.util.concurrent.ListenableFuture
 
 /** Define a custom recent emoji provider which shows most frequently used emoji */
-class CustomRecentEmojiProvider(context: Context) : RecentEmojiAsyncProvider {
-
-    private val sharedPreferences = context.getSharedPreferences(RECENT_EMOJI_LIST_FILE_NAME, Context.MODE_PRIVATE)
+class CustomRecentEmojiProvider(
+    private val customEmojiFrequency: String?,
+    private val onUpdateCustomEmojiFrequency: (updatedValue: String) -> Unit,
+) : RecentEmojiAsyncProvider {
 
     private val emoji2Frequency: MutableMap<String, Int> by lazy {
-        sharedPreferences
-            .getString(PREF_KEY_CUSTOM_EMOJI_FREQ, null)
+        customEmojiFrequency
             ?.split(SPLIT_CHAR)
             ?.associate { entry ->
                 entry.split(KEY_VALUE_DELIMITER, limit = 2).takeIf { it.size == 2 }?.let { it[0] to it[1].toInt() }
@@ -43,19 +42,10 @@ class CustomRecentEmojiProvider(context: Context) : RecentEmojiAsyncProvider {
 
     override fun recordSelection(emoji: String) {
         emoji2Frequency[emoji] = (emoji2Frequency[emoji] ?: 0) + 1
-        saveToPreferences()
-    }
-
-    private fun saveToPreferences() {
-        sharedPreferences
-            .edit()
-            .putString(PREF_KEY_CUSTOM_EMOJI_FREQ, emoji2Frequency.entries.joinToString(SPLIT_CHAR))
-            .apply()
+        onUpdateCustomEmojiFrequency(emoji2Frequency.entries.joinToString(SPLIT_CHAR))
     }
 
     companion object {
-        private const val PREF_KEY_CUSTOM_EMOJI_FREQ = "pref_key_custom_emoji_freq"
-        private const val RECENT_EMOJI_LIST_FILE_NAME = "org.geeksville.emoji.prefs"
         private const val SPLIT_CHAR = ","
         private const val KEY_VALUE_DELIMITER = "="
     }