Introduce ElementThemeApp to avoid code duplication.

app/src/main/kotlin/io/element/android/x/MainActivity.kt

@@ -26,9 +26,6 @@ import androidx.compose.foundation.layout.fillMaxSize
 import androidx.compose.material3.MaterialTheme
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.CompositionLocalProvider
-import androidx.compose.runtime.collectAsState
-import androidx.compose.runtime.getValue
-import androidx.compose.runtime.remember
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.platform.LocalUriHandler
 import androidx.core.splashscreen.SplashScreen.Companion.installSplashScreen
@@ -38,16 +35,13 @@ import androidx.lifecycle.repeatOnLifecycle
 import com.bumble.appyx.core.integration.NodeHost
 import com.bumble.appyx.core.integrationpoint.NodeActivity
 import com.bumble.appyx.core.plugin.NodeReadyObserver
-import io.element.android.compound.theme.ElementTheme
-import io.element.android.compound.theme.Theme
-import io.element.android.compound.theme.isDark
-import io.element.android.compound.theme.mapToTheme
 import io.element.android.features.lockscreen.api.LockScreenEntryPoint
 import io.element.android.features.lockscreen.api.LockScreenLockState
 import io.element.android.features.lockscreen.api.LockScreenService
 import io.element.android.features.lockscreen.api.handleSecureFlag
 import io.element.android.libraries.architecture.bindings
 import io.element.android.libraries.core.log.logger.LoggerTag
+import io.element.android.libraries.designsystem.theme.ElementThemeApp
 import io.element.android.libraries.designsystem.utils.snackbar.LocalSnackbarDispatcher
 import io.element.android.x.di.AppBindings
 import io.element.android.x.intent.SafeUriHandler
@@ -74,14 +68,8 @@ class MainActivity : NodeActivity() {
 
     @Composable
     private fun MainContent(appBindings: AppBindings) {
-        val theme by remember {
-            appBindings.preferencesStore().getThemeFlow().mapToTheme()
-        }
-            .collectAsState(initial = Theme.System)
         val migrationState = appBindings.migrationEntryPoint().present()
-        ElementTheme(
-            darkTheme = theme.isDark()
-        ) {
+        ElementThemeApp(appBindings.preferencesStore()) {
             CompositionLocalProvider(
                 LocalSnackbarDispatcher provides appBindings.snackbarDispatcher(),
                 LocalUriHandler provides SafeUriHandler(this),

features/call/impl/src/main/kotlin/io/element/android/features/call/impl/ui/ElementCallActivity.kt

@@ -30,15 +30,8 @@ import androidx.activity.compose.setContent
 import androidx.activity.result.ActivityResultLauncher
 import androidx.activity.result.contract.ActivityResultContracts
 import androidx.appcompat.app.AppCompatActivity
-import androidx.compose.runtime.collectAsState
-import androidx.compose.runtime.getValue
 import androidx.compose.runtime.mutableStateOf
-import androidx.compose.runtime.remember
 import androidx.core.content.IntentCompat
-import io.element.android.compound.theme.ElementTheme
-import io.element.android.compound.theme.Theme
-import io.element.android.compound.theme.isDark
-import io.element.android.compound.theme.mapToTheme
 import io.element.android.features.call.api.CallType
 import io.element.android.features.call.impl.DefaultElementCallEntryPoint
 import io.element.android.features.call.impl.di.CallBindings
@@ -46,6 +39,7 @@ import io.element.android.features.call.impl.pip.PictureInPicturePresenter
 import io.element.android.features.call.impl.services.CallForegroundService
 import io.element.android.features.call.impl.utils.CallIntentDataParser
 import io.element.android.libraries.architecture.bindings
+import io.element.android.libraries.designsystem.theme.ElementThemeApp
 import io.element.android.libraries.preferences.api.store.AppPreferencesStore
 import javax.inject.Inject
 
@@ -94,14 +88,8 @@ class ElementCallActivity : AppCompatActivity(), CallScreenNavigator {
         requestAudioFocus()
 
         setContent {
-            val theme by remember {
-                appPreferencesStore.getThemeFlow().mapToTheme()
-            }
-                .collectAsState(initial = Theme.System)
             val pipState = pictureInPicturePresenter.present()
-            ElementTheme(
-                darkTheme = theme.isDark()
-            ) {
+            ElementThemeApp(appPreferencesStore) {
                 val state = presenter.present()
                 CallScreenView(
                     state = state,

features/call/impl/src/main/kotlin/io/element/android/features/call/impl/ui/IncomingCallActivity.kt

@@ -20,15 +20,8 @@ import android.os.Bundle
 import android.view.WindowManager
 import androidx.activity.compose.setContent
 import androidx.appcompat.app.AppCompatActivity
-import androidx.compose.runtime.collectAsState
-import androidx.compose.runtime.getValue
-import androidx.compose.runtime.remember
 import androidx.core.content.IntentCompat
 import androidx.lifecycle.lifecycleScope
-import io.element.android.compound.theme.ElementTheme
-import io.element.android.compound.theme.Theme
-import io.element.android.compound.theme.isDark
-import io.element.android.compound.theme.mapToTheme
 import io.element.android.features.call.api.CallType
 import io.element.android.features.call.api.ElementCallEntryPoint
 import io.element.android.features.call.impl.di.CallBindings
@@ -36,6 +29,7 @@ import io.element.android.features.call.impl.notifications.CallNotificationData
 import io.element.android.features.call.impl.utils.ActiveCallManager
 import io.element.android.features.call.impl.utils.CallState
 import io.element.android.libraries.architecture.bindings
+import io.element.android.libraries.designsystem.theme.ElementThemeApp
 import io.element.android.libraries.preferences.api.store.AppPreferencesStore
 import kotlinx.coroutines.flow.filter
 import kotlinx.coroutines.flow.launchIn
@@ -79,13 +73,7 @@ class IncomingCallActivity : AppCompatActivity() {
         val notificationData = intent?.let { IntentCompat.getParcelableExtra(it, EXTRA_NOTIFICATION_DATA, CallNotificationData::class.java) }
         if (notificationData != null) {
             setContent {
-                val theme by remember {
-                    appPreferencesStore.getThemeFlow().mapToTheme()
-                }
-                    .collectAsState(initial = Theme.System)
-                ElementTheme(
-                    darkTheme = theme.isDark()
-                ) {
+                ElementThemeApp(appPreferencesStore) {
                     IncomingCallScreen(
                         notificationData = notificationData,
                         onAnswer = ::onAnswer,

features/lockscreen/impl/src/main/kotlin/io/element/android/features/lockscreen/impl/unlock/activity/PinUnlockActivity.kt

@@ -23,20 +23,14 @@ import androidx.activity.OnBackPressedCallback
 import androidx.activity.compose.setContent
 import androidx.activity.enableEdgeToEdge
 import androidx.appcompat.app.AppCompatActivity
-import androidx.compose.runtime.collectAsState
-import androidx.compose.runtime.getValue
-import androidx.compose.runtime.remember
 import androidx.lifecycle.lifecycleScope
-import io.element.android.compound.theme.ElementTheme
-import io.element.android.compound.theme.Theme
-import io.element.android.compound.theme.isDark
-import io.element.android.compound.theme.mapToTheme
 import io.element.android.features.lockscreen.api.LockScreenLockState
 import io.element.android.features.lockscreen.api.LockScreenService
 import io.element.android.features.lockscreen.impl.unlock.PinUnlockPresenter
 import io.element.android.features.lockscreen.impl.unlock.PinUnlockView
 import io.element.android.features.lockscreen.impl.unlock.di.PinUnlockBindings
 import io.element.android.libraries.architecture.bindings
+import io.element.android.libraries.designsystem.theme.ElementThemeApp
 import io.element.android.libraries.preferences.api.store.AppPreferencesStore
 import kotlinx.coroutines.launch
 import javax.inject.Inject
@@ -57,13 +51,7 @@ class PinUnlockActivity : AppCompatActivity() {
         super.onCreate(savedInstanceState)
         bindings<PinUnlockBindings>().inject(this)
         setContent {
-            val theme by remember {
-                appPreferencesStore.getThemeFlow().mapToTheme()
-            }
-                .collectAsState(initial = Theme.System)
-            ElementTheme(
-                darkTheme = theme.isDark()
-            ) {
+            ElementThemeApp(appPreferencesStore) {
                 val state = presenter.present()
                 PinUnlockView(state = state, isInAppUnlock = false)
             }

libraries/designsystem/build.gradle.kts

@@ -42,6 +42,7 @@ android {
         implementation(libs.coil.compose)
         implementation(libs.vanniktech.blurhash)
         implementation(projects.libraries.architecture)
+        implementation(projects.libraries.preferences.api)
         implementation(projects.libraries.testtags)
         implementation(projects.libraries.uiStrings)
 

libraries/designsystem/src/main/kotlin/io/element/android/libraries/designsystem/theme/ElementThemeApp.kt

@@ -0,0 +1,46 @@
+/*
+ * Copyright (c) 2024 New Vector Ltd
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package io.element.android.libraries.designsystem.theme
+
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.collectAsState
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.remember
+import io.element.android.compound.theme.ElementTheme
+import io.element.android.compound.theme.Theme
+import io.element.android.compound.theme.isDark
+import io.element.android.compound.theme.mapToTheme
+import io.element.android.libraries.preferences.api.store.AppPreferencesStore
+
+/**
+ * Theme to use for all the regular screens of the application.
+ * Will manage the light / dark theme based on the user preference.
+ */
+@Composable
+fun ElementThemeApp(
+    appPreferencesStore: AppPreferencesStore,
+    content: @Composable () -> Unit,
+) {
+    val theme by remember {
+        appPreferencesStore.getThemeFlow().mapToTheme()
+    }
+        .collectAsState(initial = Theme.System)
+    ElementTheme(
+        darkTheme = theme.isDark(),
+        content = content,
+    )
+}