Compose UI for native Linux

annotation/annotation-compatibility-stub/build.gradle

@@ -35,9 +35,7 @@ androidXComposeMultiplatform {
     js()
     wasm()
     darwin()
-
-    linuxX64()
-    linuxArm64()
+    linux()
 }
 
 kotlin {

annotation/annotation/build.gradle

@@ -19,9 +19,7 @@ androidXComposeMultiplatform {
     js()
     wasm()
     darwin()
-
-    linuxX64()
-    linuxArm64()
+    linux()
 }
 
 kotlin {

buildSrc/private/src/main/kotlin/androidx/build/AndroidXComposeMultiplatformExtensionImpl.kt

@@ -190,8 +190,7 @@ open class AndroidXComposeMultiplatformExtensionImpl @Inject constructor(
         iosArm64("uikitArm64")
         iosSimulatorArm64("uikitSimArm64")
 
-        val commonMain = sourceSets.getByName("commonMain")
-        val nativeMain = sourceSets.create("nativeMain")
+        val nativeMain = getOrCreateNativeMain()
         val darwinMain = sourceSets.create("darwinMain")
         val macosMain = sourceSets.create("macosMain")
         val macosX64Main = sourceSets.getByName("macosX64Main")
@@ -200,7 +199,6 @@ open class AndroidXComposeMultiplatformExtensionImpl @Inject constructor(
         val uikitX64Main = sourceSets.getByName("uikitX64Main")
         val uikitArm64Main = sourceSets.getByName("uikitArm64Main")
         val uikitSimArm64Main = sourceSets.getByName("uikitSimArm64Main")
-        nativeMain.dependsOn(commonMain)
         darwinMain.dependsOn(nativeMain)
         macosMain.dependsOn(darwinMain)
         macosX64Main.dependsOn(macosMain)
@@ -210,8 +208,7 @@ open class AndroidXComposeMultiplatformExtensionImpl @Inject constructor(
         uikitArm64Main.dependsOn(uikitMain)
         uikitSimArm64Main.dependsOn(uikitMain)
 
-        val commonTest = sourceSets.getByName("commonTest")
-        val nativeTest = sourceSets.create("nativeTest")
+        val nativeTest = getOrCreateNativeTest()
         val darwinTest = sourceSets.create("darwinTest")
         val macosTest = sourceSets.create("macosTest")
         val macosX64Test = sourceSets.getByName("macosX64Test")
@@ -220,7 +217,6 @@ open class AndroidXComposeMultiplatformExtensionImpl @Inject constructor(
         val uikitX64Test = sourceSets.getByName("uikitX64Test")
         val uikitArm64Test = sourceSets.getByName("uikitArm64Test")
         val uikitSimArm64Test = sourceSets.getByName("uikitSimArm64Test")
-        nativeTest.dependsOn(commonTest)
         darwinTest.dependsOn(nativeTest)
         macosTest.dependsOn(darwinTest)
         macosX64Test.dependsOn(macosTest)
@@ -231,12 +227,25 @@ open class AndroidXComposeMultiplatformExtensionImpl @Inject constructor(
         uikitSimArm64Test.dependsOn(uikitTest)
     }
 
-    override fun linuxX64(): Unit = multiplatformExtension.run {
+    override fun linux(): Unit = multiplatformExtension.run {
         linuxX64()
-    }
-
-    override fun linuxArm64(): Unit = multiplatformExtension.run {
         linuxArm64()
+
+        val nativeMain = getOrCreateNativeMain()
+        val linuxMain = sourceSets.create("linuxMain")
+        val linuxX64Main = sourceSets.getByName("linuxX64Main")
+        val linuxArm64Main = sourceSets.getByName("linuxArm64Main")
+        linuxMain.dependsOn(nativeMain)
+        linuxX64Main.dependsOn(linuxMain)
+        linuxArm64Main.dependsOn(linuxMain)
+
+        val nativeTest = getOrCreateNativeTest()
+        val linuxTest = sourceSets.create("linuxTest")
+        val linuxX64Test = sourceSets.getByName("linuxX64Test")
+        val linuxArm64Test = sourceSets.getByName("linuxArm64Test")
+        linuxTest.dependsOn(nativeTest)
+        linuxX64Test.dependsOn(linuxTest)
+        linuxArm64Test.dependsOn(linuxTest)
     }
 
     private fun getOrCreateJvmMain(): KotlinSourceSet =
@@ -245,6 +254,12 @@ open class AndroidXComposeMultiplatformExtensionImpl @Inject constructor(
     private fun getOrCreateJvmTest(): KotlinSourceSet =
         getOrCreateSourceSet("jvmTest", "commonTest")
 
+    private fun getOrCreateNativeMain(): KotlinSourceSet =
+        getOrCreateSourceSet("nativeMain", "commonMain")
+
+    private fun getOrCreateNativeTest(): KotlinSourceSet =
+        getOrCreateSourceSet("nativeTest", "commonTest")
+
     private fun getOrCreateSourceSet(
         name: String,
         dependsOnSourceSetName: String

buildSrc/public/src/main/kotlin/androidx/build/AndroidXComposeMultiplatformExtension.kt

@@ -56,15 +56,9 @@ abstract class AndroidXComposeMultiplatformExtension {
 
     /**
      * Provides the default target configuration and source set dependencies
-     * for all linuxX64 native targets.
+     * for all linux native targets.
      */
-    abstract fun linuxX64(): Unit
-
-    /**
-     * Provides the default target configuration and source set dependencies
-     * for all linuxArm64 native targets.
-     */
-    abstract fun linuxArm64(): Unit
+    abstract fun linux(): Unit
 
     /**
      * Configures native compilation tasks with flags to link required frameworks

buildSrc/src/main/kotlin/ComposePlatforms.kt

@@ -111,7 +111,7 @@ enum class ComposePlatforms(vararg val alternativeNames: String) {
         val GENERATE_KLIB = WEB + LINUX_NATIVE + WINDOWS_NATIVE + DARWIN
 
         val SKIKO_SUPPORT =
-            EnumSet.of(KotlinMultiplatform) + JVM_BASED + UI_KIT + MACOS_NATIVE + WEB
+            EnumSet.of(KotlinMultiplatform) + JVM_BASED + UI_KIT + MACOS_NATIVE + LINUX_NATIVE + WEB
 
         val ALL = EnumSet.allOf(ComposePlatforms::class.java) - IOS
         val ALL_AOSP = EnumSet.allOf(ComposePlatforms::class.java) - UI_KIT

collection/collection-compatibility-stub/build.gradle

@@ -35,9 +35,7 @@ androidXComposeMultiplatform {
     js()
     wasm()
     darwin()
-
-    linuxX64()
-    linuxArm64()
+    linux()
 }
 
 kotlin {

collection/collection/build.gradle

@@ -35,9 +35,7 @@ androidXComposeMultiplatform {
     js()
     wasm()
     darwin()
-
-    linuxX64()
-    linuxArm64()
+    linux()
 }
 
 kotlin {

compose/animation/animation-core/build.gradle

@@ -74,6 +74,7 @@ if (AndroidXComposePlugin.isMultiplatformEnabled(project)) {
         darwin()
         js()
         wasm()
+        linux()
     }
 
     kotlin {

compose/animation/animation-graphics/build.gradle

@@ -71,6 +71,7 @@ if(AndroidXComposePlugin.isMultiplatformEnabled(project)) {
         darwin()
         js()
         wasm()
+        linux()
     }
 
     kotlin {

compose/animation/animation/build.gradle

@@ -72,6 +72,7 @@ if(AndroidXComposePlugin.isMultiplatformEnabled(project)) {
         darwin()
         js()
         wasm()
+        linux()
     }
 
     kotlin {

compose/foundation/foundation-layout/build.gradle

@@ -78,6 +78,7 @@ if(AndroidXComposePlugin.isMultiplatformEnabled(project)) {
         darwin()
         js()
         wasm()
+        linux()
     }
 
     kotlin {
@@ -122,6 +123,7 @@ if(AndroidXComposePlugin.isMultiplatformEnabled(project)) {
             desktopMain.dependsOn(notMobileMain)
             macosMain.dependsOn(notMobileMain)
             jsWasmMain.dependsOn(notMobileMain)
+            linuxMain.dependsOn(notMobileMain)
 
             jsMain {
                 dependsOn(jsWasmMain)

compose/foundation/foundation/build.gradle

@@ -94,6 +94,7 @@ if (AndroidXComposePlugin.isMultiplatformEnabled(project)) {
         darwin()
         js()
         wasm()
+        linux()
 
         configureDarwinFlags()
     }

compose/foundation/foundation/src/linuxMain/kotlin/androidx/compose/foundation/Clickable.linux.kt

@@ -0,0 +1,20 @@
+/*
+ * Copyright 2024 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.foundation
+
+// TODO: b/168524931 - should this depend on the input device?
+internal actual val TapIndicationDelay: Long = 0L

compose/foundation/foundation/src/linuxMain/kotlin/androidx/compose/foundation/Overscroll.linux.kt

@@ -0,0 +1,27 @@
+/*
+ * 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.foundation
+
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.CompositionLocalAccessorScope
+
+@Composable
+internal actual fun rememberPlatformOverscrollEffect(): OverscrollEffect? =
+    null
+
+internal actual fun CompositionLocalAccessorScope.defaultOverscrollFactory(): OverscrollFactory? =
+    null

compose/foundation/foundation/src/linuxMain/kotlin/androidx/compose/foundation/RequestFocusOnClick.linux.kt

@@ -0,0 +1,19 @@
+/*
+ * 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.foundation
+
+internal actual fun isRequestFocusOnClickEnabled(): Boolean = true

compose/foundation/foundation/src/linuxMain/kotlin/androidx/compose/foundation/gestures/LinuxScrollable.linux.kt

@@ -0,0 +1,44 @@
+/*
+ * Copyright 2022 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.foundation.gestures
+
+import androidx.compose.ui.geometry.Offset
+import androidx.compose.ui.input.pointer.PointerEvent
+import androidx.compose.ui.node.CompositionLocalConsumerModifierNode
+import androidx.compose.ui.unit.Density
+import androidx.compose.ui.unit.IntSize
+import androidx.compose.ui.unit.dp
+import androidx.compose.ui.util.fastFold
+import kotlin.math.sqrt
+
+internal actual fun CompositionLocalConsumerModifierNode.platformScrollConfig(): ScrollConfig =
+    LinuxScrollConfig
+
+private object LinuxScrollConfig : ScrollConfig {
+    // See https://developer.apple.com/documentation/appkit/nsevent/1535387-scrollingdeltay
+    override fun Density.calculateMouseWheelScroll(event: PointerEvent, bounds: IntSize): Offset {
+        // 64 dp value is taken from ViewConfiguration.java, replace with better solution
+
+        val verticalScrollFactor = -64.dp.toPx()
+
+        val horizontalScrollFactor = -64.dp.toPx()
+
+        return event.changes
+            .fastFold(Offset.Zero) { acc, c -> acc + c.scrollDelta }
+            .let { Offset(it.x * horizontalScrollFactor, it.y * verticalScrollFactor) }
+    }
+}

compose/foundation/foundation/src/linuxMain/kotlin/androidx/compose/foundation/gestures/Scrollable.linux.kt

@@ -0,0 +1,36 @@
+/*
+ * Copyright 2024 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.foundation.gestures
+
+import androidx.compose.animation.SplineBasedFloatDecayAnimationSpec
+import androidx.compose.animation.core.generateDecayAnimationSpec
+import androidx.compose.animation.rememberSplineBasedDecay
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.remember
+
+internal actual fun platformDefaultFlingBehavior(): ScrollableDefaultFlingBehavior =
+    DefaultFlingBehavior(
+        SplineBasedFloatDecayAnimationSpec(UnityDensity).generateDecayAnimationSpec()
+    )
+
+@Composable
+internal actual fun rememberPlatformDefaultFlingBehavior(): FlingBehavior {
+    val flingSpec = rememberSplineBasedDecay<Float>()
+    return remember(flingSpec) {
+        DefaultFlingBehavior(flingSpec)
+    }
+}

compose/foundation/foundation/src/linuxMain/kotlin/androidx/compose/foundation/internal/ClipboardUtils.linux.kt

@@ -0,0 +1,38 @@
+/*
+ * 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.
+ */
+
+@file:OptIn(ExperimentalComposeUiApi::class)
+
+package androidx.compose.foundation.internal
+
+import androidx.compose.ui.ExperimentalComposeUiApi
+import androidx.compose.ui.platform.ClipEntry
+import androidx.compose.ui.text.AnnotatedString
+
+
+internal actual suspend fun ClipEntry.readText(): String? {
+    return null
+}
+
+internal actual suspend fun ClipEntry.readAnnotatedString(): AnnotatedString? {
+ return null
+}
+
+internal actual fun AnnotatedString?.toClipEntry(): ClipEntry? {
+    return null
+}
+
+internal actual fun ClipEntry?.hasText(): Boolean = false