xxfast · xxfast · May 28, 2024 · May 26, 2024
diff --git a/.idea/runConfigurations/browser.xml → .idea/runConfigurations/browserJs.xml b/.idea/runConfigurations/browser.xml → .idea/runConfigurations/browserJs.xml
diff --git a/.idea/runConfigurations/browserWasmJs.xml b/.idea/runConfigurations/browserWasmJs.xml
diff --git a/app/build.gradle.kts b/app/build.gradle.kts
@@ -1,6 +1,7 @@
 import org.jetbrains.compose.desktop.application.dsl.TargetFormat.Deb
 import org.jetbrains.compose.desktop.application.dsl.TargetFormat.Dmg
 import org.jetbrains.compose.desktop.application.dsl.TargetFormat.Msi
+import org.jetbrains.kotlin.gradle.targets.js.dsl.ExperimentalWasmDsl
 
 plugins {
   kotlin("multiplatform")
@@ -58,6 +59,12 @@ kotlin {
     binaries.executable()
   }
 
+  @OptIn(ExperimentalWasmDsl::class)
+  wasmJs {
+    browser()
+    binaries.executable()
+  }
+
   sourceSets {
     val commonMain by getting {
       dependencies {

diff --git a/app/src/wasmJsMain/kotlin/io/github/xxfast/decompose/router/app/Application.kt b/app/src/wasmJsMain/kotlin/io/github/xxfast/decompose/router/app/Application.kt
@@ -0,0 +1,25 @@
+package io.github.xxfast.decompose.router.app
+
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.runtime.CompositionLocalProvider
+import androidx.compose.ui.ExperimentalComposeUiApi
+import androidx.compose.ui.window.CanvasBasedWindow
+import io.github.xxfast.decompose.router.LocalRouterContext
+import io.github.xxfast.decompose.router.RouterContext
+import io.github.xxfast.decompose.router.screens.HomeScreen
+import io.github.xxfast.decompose.router.defaultRouterContext
+
+@OptIn(ExperimentalComposeUiApi::class)
+fun main() {
+  val rootRouterContext: RouterContext = defaultRouterContext()
+
+  CanvasBasedWindow(canvasElementId = "ComposeTarget") {
+    CompositionLocalProvider(
+      LocalRouterContext provides rootRouterContext,
+    ) {
+      MaterialTheme {
+        HomeScreen()
+      }
+    }
+  }
+}
diff --git a/app/src/wasmJsMain/resources/index.html b/app/src/wasmJsMain/resources/index.html
@@ -0,0 +1,15 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <meta charset="UTF-8">
+    <title>App</title>
+    <script src="skiko.js"></script>
+    <link href="styles.css" rel="stylesheet" type="text/css"/>
+</head>
+<body>
+<div id="ComposeTargetContainer">
+    <canvas id="ComposeTarget"></canvas>
+    <script src="app.js"></script>
+</div>
+</body>
+</html>
diff --git a/app/src/wasmJsMain/resources/styles.css b/app/src/wasmJsMain/resources/styles.css
@@ -0,0 +1,14 @@
+html, body {
+    height: 100%;
+    margin: 0px;
+    padding: 0px;
+}
+
+canvas {
+  width: 100vw;
+  height: 100vh;
+  display: block;
+  position: fixed;
+  top: 0;
+  left: 0;
+}
diff --git a/decompose-router/build.gradle.kts b/decompose-router/build.gradle.kts
@@ -1,4 +1,5 @@
 import org.jetbrains.kotlin.gradle.ExperimentalKotlinGradlePluginApi
+import org.jetbrains.kotlin.gradle.targets.js.dsl.ExperimentalWasmDsl
 
 plugins {
   kotlin("multiplatform")
@@ -28,6 +29,11 @@ kotlin {
     browser()
   }
 
+  @OptIn(ExperimentalWasmDsl::class)
+  wasmJs {
+    browser()
+  }
+
   sourceSets {
     val commonMain by getting {
       dependencies {
@@ -58,8 +64,6 @@ kotlin {
       }
     }
 
-    val jsMain by getting
-
     val androidMain by getting {
       dependencies {
         implementation(compose.material3)
@@ -83,6 +87,12 @@ kotlin {
         implementation(libs.compose.ui.test.manifest)
       }
     }
+
+    val jsMain by getting {
+      dependencies {
+        implementation("org.jetbrains.kotlin-wrappers:kotlin-browser:1.0.0-pre.752")
+      }
+    }
   }
 }
 

diff --git a/decompose-router/src/jsMain/kotlin/io/github/xxfast/decompose/router/DefaultRouterContext.kt b/decompose-router/src/jsMain/kotlin/io/github/xxfast/decompose/router/DefaultRouterContext.kt
@@ -5,7 +5,8 @@ import com.arkivanov.essenty.lifecycle.LifecycleRegistry
 import com.arkivanov.essenty.lifecycle.resume
 import com.arkivanov.essenty.lifecycle.stop
 import kotlinx.browser.document
-import org.w3c.dom.Document
+import web.dom.DocumentVisibilityState
+import web.dom.document as webDocument
 
 fun defaultRouterContext(): RouterContext {
   val backDispatcher = BackDispatcher()
@@ -16,11 +17,12 @@ fun defaultRouterContext(): RouterContext {
 
 // Attaches the LifecycleRegistry to the document
 private fun LifecycleRegistry.attachToDocument() {
-  fun onVisibilityChanged() = if (document.visibilityState == "visible") resume() else stop()
+  fun onVisibilityChanged() =
+    if (webDocument.visibilityState == DocumentVisibilityState.visible) resume()
+    else stop()
+
   onVisibilityChanged()
-  document.addEventListener(type = "visibilitychange", callback = { onVisibilityChanged() })
-}
 
-private val Document.visibilityState: String
-  get() = asDynamic().visibilityState.unsafeCast<String>()
+  document.addEventListener("visibilitychange", callback = { onVisibilityChanged() })
+}
 
diff --git a/...se-router/src/wasmJsMain/kotlin/io/github/xxfast/decompose/router/DefaultRouterContext.kt b/...se-router/src/wasmJsMain/kotlin/io/github/xxfast/decompose/router/DefaultRouterContext.kt
@@ -0,0 +1,27 @@
+package io.github.xxfast.decompose.router
+
+import com.arkivanov.essenty.backhandler.BackDispatcher
+import com.arkivanov.essenty.lifecycle.LifecycleRegistry
+import com.arkivanov.essenty.lifecycle.resume
+import com.arkivanov.essenty.lifecycle.stop
+import kotlinx.browser.document
+import org.w3c.dom.Document
+
+fun defaultRouterContext(): RouterContext {
+  val backDispatcher = BackDispatcher()
+  val lifecycle = LifecycleRegistry()
+  lifecycle.attachToDocument()
+  return RouterContext(lifecycle = lifecycle, backHandler = backDispatcher)
+}
+
+// Attaches the LifecycleRegistry to the document
+private fun LifecycleRegistry.attachToDocument() {
+  fun onVisibilityChanged() = if (visibilityState(document) == "visible") resume() else stop()
+  onVisibilityChanged()
+  document.addEventListener(type = "visibilitychange", callback = { onVisibilityChanged() })
+}
+
+// Workaround for Document#visibilityState not available in Wasm
+// From https://github.com/arkivanov/Minesweeper/blob/8270ffb0c75bf032b6d4da673c0bb2b01c9496ec/composeApp/src/wasmJsMain/kotlin/Main.kt#L47
+@JsFun("(document) => document.visibilityState")
+private external fun visibilityState(document: Document): String
diff --git a/decompose-router/src/wasmJsMain/kotlin/io/github/xxfast/decompose/router/Key.kt b/decompose-router/src/wasmJsMain/kotlin/io/github/xxfast/decompose/router/Key.kt
@@ -0,0 +1,7 @@
+package io.github.xxfast.decompose.router
+
+import kotlin.reflect.KClass
+
+// TODO: Given that we don't have tree-shaking on js - yet, should be safe to use simpleName here
+actual val KClass<*>.key: String get() =
+  requireNotNull(simpleName) { "Unable to use name of $this as the default key"}
diff --git a/gradle.properties b/gradle.properties
@@ -8,9 +8,11 @@ android.nonTransitiveRClass=true
 #MPP
 kotlin.mpp.enableCInteropCommonization=true
 kotlin.android.buildTypeAttribute.keep=true
+
 # Compose-multiplatform
 org.jetbrains.compose.experimental.uikit.enabled=true
 org.jetbrains.compose.experimental.jscanvas.enabled=true
+org.jetbrains.compose.experimental.wasm.enabled=true
 
 # Optin to new Android source set layout
 # https://kotlinlang.org/docs/whatsnew18.html#kotlin-multiplatform-a-new-android-source-set-layout