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Use compose to render Switch in Fabric
Summary: This change is a proof of concept to try Compose integration with RN component on Android by measuring and drawing Switch component through a Composable function. To interface Composable nodes with the view system, we use a "classic" view interoperability layer to plug Compose-based Switch into existing ViewManager and propagate props and events as we do with “classic” views. Fabric also requires initial measure during layout, which was implemented through custom background `Recomposer` and `LayoutNode` hacks to avoid creating full-blown view. Differential Revision: D31657259 fbshipit-source-id: ad5d2434d8c783d03f93b829e46e7e09ef5c4564
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ReactAndroid/src/main/java/com/facebook/react/kotlin/BackgroundMeasure.kt
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| /* | ||
| * Copyright (c) Meta Platforms, Inc. and affiliates. | ||
| * | ||
| * This source code is licensed under the MIT license found in the | ||
| * LICENSE file in the root directory of this source tree. | ||
| */ | ||
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| package com.facebook.react.kotlin | ||
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| import android.content.Context | ||
| import android.widget.FrameLayout | ||
| import androidx.compose.runtime.Composable | ||
| import androidx.compose.runtime.Composition | ||
| import androidx.compose.runtime.CompositionLocalProvider | ||
| import androidx.compose.runtime.MonotonicFrameClock | ||
| import androidx.compose.runtime.Recomposer | ||
| import androidx.compose.runtime.getValue | ||
| import androidx.compose.runtime.setValue | ||
| import androidx.compose.ui.focus.FocusDirection | ||
| import androidx.compose.ui.geometry.Offset | ||
| import androidx.compose.ui.geometry.Rect | ||
| import androidx.compose.ui.input.key.KeyEvent | ||
| import androidx.compose.ui.layout.Measurable | ||
| import androidx.compose.ui.platform.LocalContext | ||
| import androidx.compose.ui.platform.LocalDensity | ||
| import androidx.compose.ui.platform.LocalFontLoader | ||
| import androidx.compose.ui.platform.LocalLayoutDirection | ||
| import androidx.compose.ui.platform.LocalView | ||
| import androidx.compose.ui.platform.LocalViewConfiguration | ||
| import androidx.compose.ui.unit.Constraints | ||
| import androidx.compose.ui.unit.IntSize | ||
| import kotlinx.coroutines.CoroutineScope | ||
| import kotlinx.coroutines.CoroutineStart | ||
| import kotlinx.coroutines.Dispatchers | ||
| import kotlinx.coroutines.launch | ||
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| class BackgroundMeasure(private val context: Context) { | ||
| private val view = FrameLayout(context) | ||
| private val owner = | ||
| object : ComposeShims.BackgroundMeasureOwner(context) { | ||
| // These methods use inline classes, so we have to override them here | ||
| override fun calculateLocalPosition(positionInWindow: Offset): Offset = positionInWindow | ||
| override fun calculatePositionInWindow(localPosition: Offset): Offset = localPosition | ||
| override fun getFocusDirection(keyEvent: KeyEvent): FocusDirection? = null | ||
| override fun requestRectangleOnScreen(rect: Rect) {} | ||
| } | ||
| private val root = owner.root | ||
| private val applier = ComposeShims.createApplier(root) | ||
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| val clock = | ||
| object : MonotonicFrameClock { | ||
| override suspend fun <R> withFrameNanos(onFrame: (frameTimeNanos: Long) -> R): R = | ||
| onFrame(System.nanoTime()) | ||
| } | ||
| val coroutineContext = Dispatchers.Unconfined + clock | ||
| val recomposer = Recomposer(coroutineContext) | ||
| val composition = Composition(applier, recomposer) | ||
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| /** Synchronously (I hope?) measures Composable on a current thread (at least seems like so?) */ | ||
| fun measureComposable(constraints: Constraints, content: @Composable () -> Unit): IntSize { | ||
| composition.setContent { | ||
| CompositionLocalProvider( | ||
| // See ProvideCommonCompositionLocals or ProvideAndroidCompositionLocals for a full list | ||
| // Here I only added things until Text composable stopped crashing | ||
| LocalDensity.provides(owner.density), | ||
| LocalFontLoader.provides(owner.fontLoader), | ||
| LocalContext.provides(context), | ||
| LocalLayoutDirection.provides(owner.layoutDirection), | ||
| LocalViewConfiguration.provides(owner.viewConfiguration), | ||
| LocalView.provides(view), | ||
| content = content) | ||
| } | ||
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| val runRecomposeJob = | ||
| CoroutineScope(coroutineContext).launch(start = CoroutineStart.UNDISPATCHED) { | ||
| recomposer.runRecomposeAndApplyChanges() | ||
| } | ||
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| ComposeShims.attachOwner(root, owner) | ||
| owner.nodes.forEach { ComposeShims.setLayoutRequired(it) } | ||
| (root as Measurable).measure(constraints) | ||
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| runRecomposeJob.cancel() | ||
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| return IntSize(ComposeShims.getNodeWidth(root), ComposeShims.getNodeHeight(root)) | ||
| } | ||
| } |
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