Workaround for missing Dispatchers.Main

Author: Thomas-Vos

compose/ui/ui-test/src/linuxMain/kotlin/androidx/compose/ui/test/Synchronization.linuxMain.kt

@@ -16,9 +16,9 @@
 
 package androidx.compose.ui.test
 
+import androidx.compose.ui.platform.ComposeUiMainDispatcher
 import kotlinx.cinterop.ExperimentalForeignApi
 import kotlinx.cinterop.cValue
-import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.runBlocking
 import platform.posix.nanosleep
 import platform.posix.timespec
@@ -32,7 +32,7 @@ internal actual fun <T> runOnUiThread(action: () -> T): T {
     return if (isOnUiThread()) {
         action()
     } else {
-        runBlocking(Dispatchers.Main) {
+        runBlocking(ComposeUiMainDispatcher) {
             action()
         }
     }

compose/ui/ui/src/darwinMain/kotlin/androidx/compose/ui/Actuals.darwin.kt

@@ -0,0 +1,23 @@
+/*
+ * Copyright 2023 The Android Open Source Project
+ *
+ * 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
+ *
+ *      http://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 androidx.compose.ui
+
+import kotlin.coroutines.CoroutineContext
+import kotlinx.coroutines.Dispatchers
+
+internal actual val PostDelayedDispatcher: CoroutineContext
+    get() = Dispatchers.Main

compose/ui/ui/src/nativeMain/kotlin/androidx/compose/ui/platform/GlobalSnapshotManager.native.kt renamed to compose/ui/ui/src/darwinMain/kotlin/androidx/compose/ui/platform/GlobalSnapshotManager.darwin.kt

@@ -18,8 +18,6 @@ package androidx.compose.ui
 
 import androidx.compose.ui.node.ModifierNodeElement
 import androidx.compose.ui.platform.InspectorInfo
-import kotlin.coroutines.CoroutineContext
-import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.CancellationException
 
 internal actual fun classKeyForObject(a: Any): Any {
@@ -33,6 +31,3 @@ internal actual fun InspectorInfo.tryPopulateReflectively(
     element: ModifierNodeElement<*>
 ) {
 }
-
-internal actual val PostDelayedDispatcher: CoroutineContext
-    get() = Dispatchers.Main

compose/ui/ui/src/jsNativeMain/kotlin/androidx/compose/ui/Actuals.jsNative.kt

@@ -0,0 +1,23 @@
+/*
+ * Copyright 2023 The Android Open Source Project
+ *
+ * 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
+ *
+ *      http://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 androidx.compose.ui
+
+import kotlin.coroutines.CoroutineContext
+import kotlinx.coroutines.Dispatchers
+
+internal actual val PostDelayedDispatcher: CoroutineContext
+    get() = Dispatchers.Main

compose/ui/ui/src/jsWasmMain/kotlin/androidx/compose/ui/Actuals.jsWasm.kt

@@ -0,0 +1,23 @@
+/*
+ * Copyright 2023 The Android Open Source Project
+ *
+ * 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
+ *
+ *      http://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 androidx.compose.ui
+
+import androidx.compose.ui.platform.ComposeUiMainDispatcher
+import kotlin.coroutines.CoroutineContext
+
+internal actual val PostDelayedDispatcher: CoroutineContext
+    get() = ComposeUiMainDispatcher

compose/ui/ui/src/linuxMain/kotlin/androidx/compose/ui/Actuals.linux.kt

@@ -0,0 +1,21 @@
+/*
+ * Copyright 2025 The Android Open Source Project
+ *
+ * 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
+ *
+ *      http://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 androidx.compose.ui.platform
+
+import kotlinx.coroutines.CoroutineDispatcher
+
+lateinit var ComposeUiMainDispatcher: CoroutineDispatcher // TODO: https://github.com/Kotlin/kotlinx.coroutines/issues/4286

compose/ui/ui/src/linuxMain/kotlin/androidx/compose/ui/platform/ComposeUiMainDispatcher.linux.kt

@@ -0,0 +1,21 @@
+/*
+ * Copyright 2020 The Android Open Source Project
+ *
+ * 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
+ *
+ *      http://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 androidx.compose.ui.platform
+
+import kotlinx.coroutines.CoroutineDispatcher
+
+internal actual val GlobalSnapshotManagerDispatcher: CoroutineDispatcher get() = ComposeUiMainDispatcher