Refactor interop with js in k/js and k/wasm source sets (#843)

* Refactor interop with js in k/js and k/wasm source sets

* Make event conversion functions internal

The event conversion functions in the 'Convertors.js.kt' and 'Convertors.wasm.kt' files have been updated from public to internal.

* Disable local maven repository

* PR fixes

---------
Co-authored-by: Oleksandr.Karpovich <oleksandr.karpovich@jetbrains.com>

samples/SkiaJsSample/gradle.properties

 kotlin.code.style=official
-kotlin.version=1.9.20
-skiko.composite.build=1
\ No newline at end of file
+kotlin.version=1.9.21
+#skiko.composite.build=1
\ No newline at end of file

samples/SkiaJsSample/src/jsMain/kotlin/org/jetbrains/skiko/sample/js/App.js.kt

 package org.jetbrains.skiko.sample.js
 
+import kotlinx.browser.document
 import org.jetbrains.skiko.wasm.onWasmReady
 
 fun main() {
     onWasmReady(::runApp)
-}
\ No newline at end of file
+}
+
+actual fun findElementById(id: String): Any? = document.getElementById(id)
\ No newline at end of file

samples/SkiaJsSample/src/jsWasmMain/kotlin/org/jetbrains/skiko/sample/js/App.jsWasm.kt

 package org.jetbrains.skiko.sample.js
 
-import kotlinx.browser.document
 import org.jetbrains.skia.Canvas
 import org.jetbrains.skia.Paint
 import org.jetbrains.skia.Rect
 import org.jetbrains.skiko.GenericSkikoView
 import org.jetbrains.skiko.SkiaLayer
 import org.jetbrains.skiko.SkikoView
-import org.w3c.dom.HTMLCanvasElement
 
 private class DemoApp: SkikoView {
     private val paint = Paint()
@@ -25,7 +23,7 @@ private class DemoApp: SkikoView {
 internal fun runApp() {
     for (index in 1 .. 3) {
         val skiaLayer = SkiaLayer()
-        val canvas = document.getElementById("c$index") as HTMLCanvasElement
+        val canvas = findElementById("c$index")!!
         val app = if (index == 3) {
             DemoApp()
         } else {
@@ -35,4 +33,9 @@ internal fun runApp() {
         skiaLayer.attachTo(canvas)
         skiaLayer.needRedraw()
     }
-}
\ No newline at end of file
+}
+
+
+// Note: despite the actual implementation looks identical, it can't be common - there is no W3C common API
+// return type is Any because k/js and k/wasm don't have a common type for HTML elements
+expect fun findElementById(id: String): Any?
\ No newline at end of file

samples/SkiaJsSample/src/wasmJsMain/kotlin/org/jetbrains/skiko/sample/js/App.wasm.kt

 package org.jetbrains.skiko.sample.js
 
+import kotlinx.browser.document
+
 fun main() {
     runApp()
-}
\ No newline at end of file
+}
+
+actual fun findElementById(id: String): Any? = document.getElementById(id)
\ No newline at end of file

samples/SkiaMultiplatformSample/build.gradle.kts

@@ -22,6 +22,8 @@ repositories {
     google()
     mavenCentral()
     maven("https://maven.pkg.jetbrains.space/public/p/compose/dev")
+
+     // mavenLocal()
 }
 
 val osName = System.getProperty("os.name")

samples/SkiaMultiplatformSample/gradle.properties

 kotlin.code.style=official
 org.gradle.jvmargs=-Xmx3G -XX:MaxMetaspaceSize=512m
-kotlin.version=1.9.20
+kotlin.version=1.9.21
 #skiko.composite.build=1
\ No newline at end of file

samples/SkiaMultiplatformSample/src/jsMain/kotlin/org/jetbrains/skiko/sample/App.js.kt

 package org.jetbrains.skiko.sample
 
+import kotlinx.browser.document
 import kotlinx.browser.window
+import org.jetbrains.skiko.GenericSkikoView
+import org.jetbrains.skiko.SkiaLayer
 import org.jetbrains.skiko.wasm.onWasmReady
+import org.w3c.dom.HTMLCanvasElement
 
 fun main() {
     window.addEventListener("DOMContentLoaded", {
         onWasmReady(::runApp)
     })
 }
+
+internal fun runApp() {
+    val skiaLayer = SkiaLayer()
+    skiaLayer.onContentScaleChanged = { scale -> println(scale) }
+    val game = JsClocks(skiaLayer)
+    skiaLayer.skikoView = GenericSkikoView(skiaLayer, game)
+    val canvas = document.getElementById("SkikoTarget") as HTMLCanvasElement
+    canvas.setAttribute("tabindex", "0")
+    skiaLayer.attachTo(canvas)
+    skiaLayer.needRedraw()
+}
\ No newline at end of file

samples/SkiaMultiplatformSample/src/jsWasmMain/kotlin/org/jetbrains/skiko/sample/App.jsWasm.kt

-package org.jetbrains.skiko.sample
-
-import kotlinx.browser.document
-import org.jetbrains.skiko.*
-import org.w3c.dom.HTMLCanvasElement
-
-internal fun runApp() {
-    val skiaLayer = SkiaLayer()
-    onContentScaleChanged = { scale -> println(scale) }
-    val game = JsClocks(skiaLayer)
-    skiaLayer.skikoView = GenericSkikoView(skiaLayer, game)
-    val canvas = document.getElementById("SkikoTarget") as HTMLCanvasElement
-    canvas.setAttribute("tabindex", "0")
-    skiaLayer.attachTo(canvas)
-    skiaLayer.needRedraw()
-}
\ No newline at end of file

samples/SkiaMultiplatformSample/src/wasmJsMain/kotlin/org/jetbrains/skiko/sample/App.wasm.kt

 package org.jetbrains.skiko.sample
 
+import kotlinx.browser.document
+import org.jetbrains.skiko.GenericSkikoView
+import org.jetbrains.skiko.SkiaLayer
+import org.w3c.dom.HTMLCanvasElement
+
 fun main() {
     runApp()
 }
+
+internal fun runApp() {
+    val skiaLayer = SkiaLayer()
+    skiaLayer.onContentScaleChanged = { scale -> println(scale) }
+    val game = JsClocks(skiaLayer)
+    skiaLayer.skikoView = GenericSkikoView(skiaLayer, game)
+    val canvas = document.getElementById("SkikoTarget") as HTMLCanvasElement
+    canvas.setAttribute("tabindex", "0")
+    skiaLayer.attachTo(canvas)
+    skiaLayer.needRedraw()
+}
\ No newline at end of file

skiko/build.gradle.kts

@@ -542,14 +542,6 @@ project.tasks.withType<org.jetbrains.kotlin.gradle.dsl.KotlinJsCompile>().config
     )
 }
 
-if (supportJs && supportWasm) {
-    project.tasks.whenTaskAdded {
-        if (name == "compileJsWasmMainKotlinMetadata") {
-            enabled = false
-        }
-    }
-}
-
 tasks.findByName("publishSkikoWasmRuntimePublicationToComposeRepoRepository")
     ?.dependsOn("publishWasmJsPublicationToComposeRepoRepository")
 

skiko/src/jsMain/kotlin/org/jetbrains/skiko/Actuals.js.kt

 package org.jetbrains.skiko
 
-import org.w3c.dom.events.MouseEvent
+import org.w3c.dom.HTMLElement
 import org.w3c.dom.events.UIEvent
 
-internal actual fun getEventTimestamp(e: UIEvent): Long {
+internal fun getEventTimestamp(e: UIEvent): Long {
     return e.timeStamp.toLong()
-}
\ No newline at end of file
+}
+
+internal actual fun CursorManager_setCursor(component: Any, cursor: Cursor) {
+    (component as? HTMLElement)?.style?.cursor = cursor
+}
+
+internal actual fun CursorManager_getCursor(component: Any): Cursor? {
+    return (component as? HTMLElement)?.style?.cursor
+}
+
+internal actual fun getNavigatorInfo(): String =
+    js("navigator.userAgentData ? navigator.userAgentData.platform : navigator.platform") as String
\ No newline at end of file

skiko/src/jsMain/kotlin/org/jetbrains/skiko/CanvasRenderer.js.kt

+package org.jetbrains.skiko
+
+import org.jetbrains.skia.impl.NativePointer
+import org.jetbrains.skiko.wasm.GL
+
+internal actual fun makeGLContextCurrent(contextPointer: NativePointer) {
+    GL.makeContextCurrent(contextPointer)
+}
\ No newline at end of file

skiko/src/jsWasmMain/kotlin/org/jetbrains/skiko/Convertors.js.kt → skiko/src/jsMain/kotlin/org/jetbrains/skiko/Convertors.js.kt

 package org.jetbrains.skiko
 
-import org.w3c.dom.events.*
+import org.w3c.dom.events.KeyboardEvent
+import org.w3c.dom.events.MouseEvent
+import org.w3c.dom.events.WheelEvent
 
-private val SPECIAL_KEYS = setOf(
-    "Unidentified",
-    "Alt",
-    "AltGraph",
-    "Backspace",
-    "CapsLock",
-    "Control",
-    "Fn",
-    "FnLock",
-    "Hyper",
-    "Meta",
-    "NumLock",
-    "ScrollLock",
-    "Shift",
-    "Super",
-    "Symbol",
-    "SymbolLock",
-    "F1",
-    "F2",
-    "F3",
-    "F4",
-    "F5",
-    "F6",
-    "F7",
-    "F8",
-    "F9",
-    "F10",
-    "F11",
-    "F12",
-    "F13",
-    "F14",
-    "F15",
-    "F16",
-    "F17",
-    "F18",
-    "F19",
-    "F20",
-    "F21",
-    "F22",
-    "ArrowLeft",
-    "ArrowUp",
-    "ArrowRight",
-    "ArrowDown",
-    "Help",
-    "Home",
-    "Delete",
-    "End",
-    "PageUp",
-    "PageDown",
-    "Escape",
-    "Clear",
-    "Clear"
-)
-
-internal expect fun getEventTimestamp(e: UIEvent): Long
-
-fun toSkikoEvent(
+internal fun toSkikoEvent(
     event: MouseEvent,
     kind: SkikoPointerEventKind
 ): SkikoPointerEvent {
@@ -74,7 +20,7 @@ fun toSkikoEvent(
     )
 }
 
-fun toSkikoDragEvent(
+internal fun toSkikoDragEvent(
     event: MouseEvent
 ): SkikoPointerEvent {
     return SkikoPointerEvent(
@@ -89,7 +35,7 @@ fun toSkikoDragEvent(
     )
 }
 
-fun toSkikoTypeEvent(
+internal fun toSkikoTypeEvent(
     character: String,
     event: KeyboardEvent?,
 ): SkikoInputEvent? {
@@ -114,7 +60,7 @@ fun toSkikoTypeEvent(
 }
 
 
-fun toSkikoEvent(
+internal fun toSkikoEvent(
     event: KeyboardEvent,
     kind: SkikoKeyboardEventKind
 ): SkikoKeyboardEvent {
@@ -127,7 +73,7 @@ fun toSkikoEvent(
     )
 }
 
-fun toSkikoScrollEvent(
+internal fun toSkikoScrollEvent(
     event: WheelEvent,
 ): SkikoPointerEvent {
     return SkikoPointerEvent(
@@ -217,7 +163,7 @@ private fun toSkikoKey(event: KeyboardEvent): Int {
             key == SkikoKey.KEY_LEFT_SHIFT.platformKeyCode ||
             key == SkikoKey.KEY_LEFT_META.platformKeyCode
         )
-        key = key.or(0x80000000.toInt())
+            key = key.or(0x80000000.toInt())
     }
     return key
 }
\ No newline at end of file

skiko/src/jsMain/kotlin/org/jetbrains/skiko/SkiaLayer.js.kt

+package org.jetbrains.skiko
+
+import kotlinx.browser.window
+import org.jetbrains.skiko.w3c.HTMLCanvasElement
+import org.w3c.dom.events.KeyboardEvent
+import org.w3c.dom.events.MouseEvent
+import org.w3c.dom.events.WheelEvent
+
+internal actual fun SkiaLayer.bindCanvasEventsToSkikoView(
+    canvas: HTMLCanvasElement
+) {
+    val htmlCanvas = canvas.unsafeCast<org.w3c.dom.HTMLCanvasElement>()
+
+    htmlCanvas.addEventListener("mousedown", { event ->
+        event as MouseEvent
+        isPointerPressed = true
+        skikoView?.onPointerEvent(toSkikoEvent(event, SkikoPointerEventKind.DOWN))
+    })
+    htmlCanvas.addEventListener("mouseup", { event ->
+        event as MouseEvent
+        isPointerPressed = false
+        skikoView?.onPointerEvent(toSkikoEvent(event, SkikoPointerEventKind.UP))
+    })
+    htmlCanvas.addEventListener("mousemove", { event ->
+        event as MouseEvent
+        if (isPointerPressed) {
+            skikoView?.onPointerEvent(toSkikoDragEvent(event))
+        } else {
+            skikoView?.onPointerEvent(toSkikoEvent(event, SkikoPointerEventKind.MOVE))
+        }
+    })
+    htmlCanvas.addEventListener("wheel", { event ->
+        event as WheelEvent
+        skikoView?.onPointerEvent(toSkikoScrollEvent(event))
+    })
+    htmlCanvas.addEventListener("contextmenu", { event ->
+        event.preventDefault()
+    })
+    htmlCanvas.addEventListener("keydown", { event ->
+        event as KeyboardEvent
+        skikoView?.onKeyboardEvent(toSkikoEvent(event, SkikoKeyboardEventKind.DOWN))
+
+        toSkikoTypeEvent(event.key, event)?.let { inputEvent ->
+            skikoView?.input?.onInputEvent(inputEvent)
+        }
+    })
+    htmlCanvas.addEventListener("keyup", { event ->
+        event as KeyboardEvent
+        skikoView?.onKeyboardEvent(toSkikoEvent(event, SkikoKeyboardEventKind.UP))
+    })
+}
+
+actual typealias SkikoGesturePlatformEvent = Any
+actual typealias SkikoPlatformInputEvent = KeyboardEvent
+actual typealias SkikoPlatformKeyboardEvent = KeyboardEvent
+//  MouseEvent is base class of PointerEvent
+actual typealias SkikoPlatformPointerEvent = MouseEvent
+
+internal actual fun SkiaLayer.setOnChangeScaleNotifier() {
+    state?.initCanvas(desiredWidth, desiredHeight, contentScale, this.pixelGeometry)
+    window.matchMedia("(resolution: ${contentScale}dppx)")
+        .addEventListener("change", { setOnChangeScaleNotifier() }, true)
+    onContentScaleChanged?.invoke(contentScale)
+}
\ No newline at end of file

skiko/src/jsMain/kotlin/org/jetbrains/skiko/wasm/Wrapper.kt

 package org.jetbrains.skiko.wasm
 
 import org.jetbrains.skia.impl.NativePointer
-import org.w3c.dom.HTMLCanvasElement
+import org.jetbrains.skiko.w3c.HTMLCanvasElement
 import kotlin.js.*
 
 /**
@@ -40,7 +40,6 @@ internal external object GL : GLInterface {
     override fun makeContextCurrent(contextPointer: NativePointer): Boolean = definedExternally
 }
 
-
 internal actual fun createWebGLContext(canvas: HTMLCanvasElement, attr: ContextAttributes?): NativePointer {
     val contextAttributes = object : ContextAttributes {
         override val alpha = attr?.alpha ?: 1

skiko/src/jsWasmMain/kotlin/org/jetbrains/skia/Actuals.js.kt

 package org.jetbrains.skia
 
-import kotlinx.browser.window
+import org.jetbrains.skiko.w3c.window
 
 internal actual fun <R> commonSynchronized(lock: Any, block: () -> R) {
     block()

skiko/src/jsWasmMain/kotlin/org/jetbrains/skiko/Actuals.js.kt

 package org.jetbrains.skiko
 
-import org.w3c.dom.HTMLElement
+import org.jetbrains.skiko.w3c.window
 
 internal actual inline fun <R> maybeSynchronized(lock: Any, block: () -> R): R =
     block()
 
-actual fun currentNanoTime(): Long = (kotlinx.browser.window.performance.now() * 1_000_000).toLong()
+actual fun currentNanoTime(): Long = (window.performance.now() * 1_000_000).toLong()
 
 internal actual fun URIHandler_openUri(uri: String) {
-    kotlinx.browser.window.open(uri, target = "_blank")
+    window.open(uri, target = "_blank")
 }
 
 internal actual fun ClipboardManager_setText(text: String) {
-    kotlinx.browser.window.navigator.clipboard.writeText(text)
+    window.navigator.clipboard.writeText(text)
 }
 
 internal actual fun ClipboardManager_getText(): String? {
@@ -25,20 +25,6 @@ internal actual fun ClipboardManager_hasText(): Boolean = !ClipboardManager_getT
 
 actual typealias Cursor = String
 
-internal actual fun CursorManager_setCursor(component: Any, cursor: Cursor) {
-    if (component is HTMLElement) {
-        component.style.cursor = cursor
-    }
-}
-
-internal actual fun CursorManager_getCursor(component: Any): Cursor? {
-    return if (component is HTMLElement) {
-        component.style.cursor
-    } else {
-        null
-    }
-}
-
 internal actual fun getCursorById(id: PredefinedCursorsId): Cursor =
     when (id) {
         PredefinedCursorsId.DEFAULT -> "default"

skiko/src/jsWasmMain/kotlin/org/jetbrains/skiko/CanvasRenderer.kt

 package org.jetbrains.skiko
 
-import kotlinx.browser.window
 import org.jetbrains.skia.*
+import org.jetbrains.skia.impl.NativePointer
+import org.jetbrains.skiko.w3c.HTMLCanvasElement
+import org.jetbrains.skiko.w3c.window
 import org.jetbrains.skiko.wasm.createWebGLContext
-import org.jetbrains.skiko.wasm.GL
-import org.w3c.dom.HTMLCanvasElement
 
 /**
  * CanvasRenderer takes an [HTMLCanvasElement] instance and initializes
@@ -13,7 +13,9 @@ import org.w3c.dom.HTMLCanvasElement
  * After initialization [needRedraw] can be used to schedule a call to [drawFrame].
  * [drawFrame] has to be implemented to perform the actual drawing on [canvas].
  */
-abstract class CanvasRenderer constructor(val htmlCanvas: HTMLCanvasElement) {
+internal abstract class CanvasRenderer(
+    private val htmlCanvas: HTMLCanvasElement
+) {
     private val contextPointer = createWebGLContext(htmlCanvas)
     private val context: DirectContext
     private var surface: Surface? = null
@@ -39,7 +41,7 @@ abstract class CanvasRenderer constructor(val htmlCanvas: HTMLCanvasElement) {
         get() = htmlCanvas.height
 
     init {
-        GL.makeContextCurrent(contextPointer)
+        makeGLContextCurrent(contextPointer)
         context = DirectContext.makeGL()
     }
 
@@ -93,7 +95,7 @@ abstract class CanvasRenderer constructor(val htmlCanvas: HTMLCanvasElement) {
         redrawScheduled = true
         window.requestAnimationFrame { timestamp ->
             redrawScheduled = false
-            GL.makeContextCurrent(contextPointer)
+            makeGLContextCurrent(contextPointer)
             // `clear` and `resetMatrix` make canvas not accumulate previous effects
             canvas?.clear(Color.WHITE)
             canvas?.resetMatrix()
@@ -103,3 +105,5 @@ abstract class CanvasRenderer constructor(val htmlCanvas: HTMLCanvasElement) {
         }
     }
 }
+
+internal expect fun makeGLContextCurrent(contextPointer: NativePointer)
\ No newline at end of file

skiko/src/jsWasmMain/kotlin/org/jetbrains/skiko/Convertors.kt

+package org.jetbrains.skiko
+
+internal val SPECIAL_KEYS = setOf(
+    "Unidentified",
+    "Alt",
+    "AltGraph",
+    "Backspace",
+    "CapsLock",
+    "Control",
+    "Fn",
+    "FnLock",
+    "Hyper",
+    "Meta",
+    "NumLock",
+    "ScrollLock",
+    "Shift",
+    "Super",
+    "Symbol",
+    "SymbolLock",
+    "F1",
+    "F2",
+    "F3",
+    "F4",
+    "F5",
+    "F6",
+    "F7",
+    "F8",
+    "F9",
+    "F10",
+    "F11",
+    "F12",
+    "F13",
+    "F14",
+    "F15",
+    "F16",
+    "F17",
+    "F18",
+    "F19",
+    "F20",
+    "F21",
+    "F22",
+    "ArrowLeft",
+    "ArrowUp",
+    "ArrowRight",
+    "ArrowDown",
+    "Help",
+    "Home",
+    "Delete",
+    "End",
+    "PageUp",
+    "PageDown",
+    "Escape",
+    "Clear",
+    "Clear"
+)
\ No newline at end of file

skiko/src/jsWasmMain/kotlin/org/jetbrains/skiko/OsArch.js.kt

 package org.jetbrains.skiko
 
-import kotlinx.browser.window
+import org.jetbrains.skiko.w3c.window
 
 actual val hostOs: OS = detectHostOs()
 
@@ -22,9 +22,7 @@ actual val kotlinBackend: KotlinBackend
  * See https://developer.mozilla.org/en-US/docs/Web/API/NavigatorUAData/platform - new API,
  * but not supported in all browsers
  */
-private fun getNavigatorInfo(): String =
-    js("navigator.userAgentData ? navigator.userAgentData.platform : navigator.platform") //as String // k/wasm requires only 1 expression in a function calling `js`
-
+internal expect fun getNavigatorInfo(): String
 
 /**
  * In a browser, user platform can be obtained from different places:

skiko/src/jsWasmMain/kotlin/org/jetbrains/skiko/SkiaLayer.js.kt

 package org.jetbrains.skiko
 
-import kotlinx.browser.window
 import org.jetbrains.skia.Canvas
 import org.jetbrains.skia.PixelGeometry
-import org.w3c.dom.HTMLCanvasElement
-import org.w3c.dom.events.InputEvent
-import org.w3c.dom.events.KeyboardEvent
-import org.w3c.dom.events.MouseEvent
-import org.w3c.dom.events.WheelEvent
+import org.jetbrains.skiko.w3c.HTMLCanvasElement
+import org.jetbrains.skiko.w3c.window
 
 /**
  * Provides a way to render the content and to receive the input events.
@@ -17,7 +13,7 @@ import org.w3c.dom.events.WheelEvent
  * using [attachTo] method.
  */
 actual open class SkiaLayer {
-    private var state: CanvasRenderer? = null
+    internal var state: CanvasRenderer? = null
 
     /**
      * [GraphicsApi.WEBGL] is the only supported renderApi for k/js (browser).
@@ -72,10 +68,10 @@ actual open class SkiaLayer {
         // TODO: when switch to the frame dispatcher - stop it here.
     }
 
-    private var isPointerPressed = false
+    internal var isPointerPressed = false
 
-    private var desiredWidth = 0
-    private var desiredHeight = 0
+    internal var desiredWidth = 0
+    internal var desiredHeight = 0
 
     actual val component: Any?
         get() = this.htmlCanvas
@@ -86,7 +82,7 @@ actual open class SkiaLayer {
      * Initializes the [CanvasRenderer] and events listeners.
      * Delegates rendering and events processing to [skikoView].
      */
-    fun attachTo(htmlCanvas: HTMLCanvasElement, autoDetach: Boolean = true) {
+    private fun attachTo(htmlCanvas: HTMLCanvasElement, autoDetach: Boolean = true) {
         this.htmlCanvas = htmlCanvas
 
         // Scale canvas to allow high DPI rendering as suggested in
@@ -105,49 +101,7 @@ actual open class SkiaLayer {
         }.apply { initCanvas(desiredWidth, desiredHeight, contentScale, pixelGeometry) }
         // See https://www.w3schools.com/jsref/dom_obj_event.asp
         // https://developer.mozilla.org/en-US/docs/Web/API/Pointer_events
-        htmlCanvas.addEventListener("mousedown", { event ->
-            event as MouseEvent
-            isPointerPressed = true
-            skikoView?.onPointerEvent(toSkikoEvent(event, SkikoPointerEventKind.DOWN))
-        })
-        htmlCanvas.addEventListener("mouseup", { event ->
-            event as MouseEvent
-            isPointerPressed = false
-            skikoView?.onPointerEvent(toSkikoEvent(event, SkikoPointerEventKind.UP))
-        })
-        htmlCanvas.addEventListener("mousemove", { event ->
-            event as MouseEvent
-            if (isPointerPressed) {
-                skikoView?.onPointerEvent(toSkikoDragEvent(event))
-            } else {
-                skikoView?.onPointerEvent(toSkikoEvent(event, SkikoPointerEventKind.MOVE))
-            }
-        })
-        htmlCanvas.addEventListener("wheel", { event ->
-            event as WheelEvent
-            skikoView?.onPointerEvent(toSkikoScrollEvent(event))
-        })
-        htmlCanvas.addEventListener("contextmenu", { event ->
-            event.preventDefault()
-        })
-        htmlCanvas.addEventListener("keydown", { event ->
-            event as KeyboardEvent
-            skikoView?.onKeyboardEvent(toSkikoEvent(event, SkikoKeyboardEventKind.DOWN))
-
-            toSkikoTypeEvent(event.key, event)?.let { inputEvent ->
-                skikoView?.input?.onInputEvent(inputEvent)
-            }
-        })
-        htmlCanvas.addEventListener("keyup", { event ->
-            event as KeyboardEvent
-            skikoView?.onKeyboardEvent(toSkikoEvent(event, SkikoKeyboardEventKind.UP))
-        })
-    }
-
-    private fun setOnChangeScaleNotifier() {
-        state?.initCanvas(desiredWidth, desiredHeight, contentScale, this.pixelGeometry)
-        window.matchMedia("(resolution: ${contentScale}dppx)").addEventListener("change", { setOnChangeScaleNotifier() }, true)
-        onContentScaleChanged?.invoke(contentScale)
+        bindCanvasEventsToSkikoView(htmlCanvas)
     }
 
     internal actual fun draw(canvas: Canvas) {
@@ -156,12 +110,10 @@ actual open class SkiaLayer {
 
     actual val pixelGeometry: PixelGeometry
         get() = PixelGeometry.UNKNOWN
+
+    var onContentScaleChanged: ((Float) -> Unit)? = null
 }
 
-var onContentScaleChanged: ((Float) -> Unit)? = null
 
-actual typealias SkikoGesturePlatformEvent = Any
-actual typealias SkikoPlatformInputEvent = KeyboardEvent
-actual typealias SkikoPlatformKeyboardEvent = KeyboardEvent
-//  MouseEvent is base class of PointerEvent
-actual typealias SkikoPlatformPointerEvent = MouseEvent
+internal expect fun SkiaLayer.bindCanvasEventsToSkikoView(canvas: HTMLCanvasElement)
+internal expect fun SkiaLayer.setOnChangeScaleNotifier()

skiko/src/jsWasmMain/kotlin/org/jetbrains/skiko/w3c/W3CSubset.kt

+package org.jetbrains.skiko.w3c
+
+/**
+ * The purpose of this file is to facilitate shared W3C type declarations
+ * for use in both kotlin/js and kotlin/wasm code.
+ * Given that the Kotlin standard library does not provide common (shared between kotlin/js and kotlin/wasm) W3C API,
+ * this file serves to fill that void with custom partial declarations.
+ *
+ * These declarations do not cover all attributes and methods of the respective W3C types,
+ * but only those needed by our implementations.
+ */
+
+@Suppress("ClassName")
+internal external object window {
+    val devicePixelRatio: Double
+    val navigator: Navigator
+    val performance: Performance
+
+    fun requestAnimationFrame(block: (Double) -> Unit)
+    fun open(url: String?, target: String?)
+}
+
+internal external interface Performance {
+    fun now(): Double
+}
+
+internal external interface Navigator {
+    val language: String
+    val clipboard: Clipboard
+    val userAgent: String
+}
+
+internal external interface Clipboard {
+    fun writeText(text: String)
+}
+
+internal abstract external class HTMLCanvasElement {
+    internal var width: Int
+    internal var height: Int
+    internal val style: CSSStyleDeclaration
+}
+
+internal abstract external class CSSStyleDeclaration {
+    var width: String
+    var height: String
+}
\ No newline at end of file

skiko/src/jsWasmMain/kotlin/org/jetbrains/skiko/wasm/Wrapper.kt

 package org.jetbrains.skiko.wasm
 
 import org.jetbrains.skia.impl.NativePointer
-import org.w3c.dom.HTMLCanvasElement
-import kotlin.js.*
-
+import org.jetbrains.skiko.w3c.HTMLCanvasElement
 
 internal external interface ContextAttributes {
     val alpha: Int?

skiko/src/wasmJsMain/kotlin/org/jetbrains/skiko/Actuals.wasm.kt

 package org.jetbrains.skiko
 
-import org.w3c.dom.events.MouseEvent
+import org.w3c.dom.HTMLElement
 import org.w3c.dom.events.UIEvent
 
-internal actual fun getEventTimestamp(e: UIEvent): Long {
+internal fun getEventTimestamp(e: UIEvent): Long {
     // TODO: why can't do timestamp.toLong()
     return e.timeStamp.toInt().toLong()
-}
\ No newline at end of file
+}
+
+internal actual fun CursorManager_setCursor(component: Any, cursor: Cursor) {
+    (component as? HTMLElement)?.style?.cursor = cursor
+}
+
+internal actual fun CursorManager_getCursor(component: Any): Cursor? {
+    return (component as? HTMLElement)?.style?.cursor
+}
+
+internal actual fun getNavigatorInfo(): String =
+    js("navigator.userAgentData ? navigator.userAgentData.platform : navigator.platform")
\ No newline at end of file

skiko/src/wasmJsMain/kotlin/org/jetbrains/skiko/CanvasRenderer.wasmJs.kt

+package org.jetbrains.skiko
+
+import org.jetbrains.skia.impl.NativePointer
+import org.jetbrains.skiko.wasm.GL
+
+internal actual fun makeGLContextCurrent(contextPointer: NativePointer) {
+    GL.makeContextCurrent(contextPointer)
+}
\ No newline at end of file

skiko/src/wasmJsMain/kotlin/org/jetbrains/skiko/Convertors.wasm.kt

+package org.jetbrains.skiko
+
+import org.w3c.dom.events.KeyboardEvent
+import org.w3c.dom.events.MouseEvent
+import org.w3c.dom.events.WheelEvent
+
+internal fun toSkikoEvent(
+    event: MouseEvent,
+    kind: SkikoPointerEventKind
+): SkikoPointerEvent {
+    return SkikoPointerEvent(
+        x = event.offsetX,
+        y = event.offsetY,
+        pressedButtons = toSkikoPressedMouseButtons(event, kind),
+        button = toSkikoMouseButton(event),
+        modifiers = toSkikoModifiers(event),
+        kind = kind,
+        timestamp = getEventTimestamp(event),
+        platform = event
+    )
+}
+
+internal fun toSkikoDragEvent(
+    event: MouseEvent
+): SkikoPointerEvent {
+    return SkikoPointerEvent(
+        x = event.offsetX,
+        y = event.offsetY,
+        pressedButtons = SkikoMouseButtons(buttonsFlags),
+        button = toSkikoMouseButton(event),
+        modifiers = toSkikoModifiers(event),
+        kind = SkikoPointerEventKind.DRAG,
+        timestamp = getEventTimestamp(event),
+        platform = event
+    )
+}
+
+internal fun toSkikoTypeEvent(
+    character: String,
+    event: KeyboardEvent?,
+): SkikoInputEvent? {
+    return if (SPECIAL_KEYS.contains(character)) {
+        null
+    } else {
+        val input = when (character) {
+            "Enter" -> "\n"
+            "Tab" -> "\t"
+            else -> character
+        }
+        val key = if (event != null) SkikoKey.valueOf(event.keyCode) else SkikoKey.KEY_UNKNOWN
+        val modifiers = if  (event != null) toSkikoModifiers(event) else SkikoInputModifiers.EMPTY
+        SkikoInputEvent(
+            input,
+            key,
+            modifiers,
+            SkikoKeyboardEventKind.TYPE,
+            event
+        )
+    }
+}
+
+
+internal fun toSkikoEvent(
+    event: KeyboardEvent,
+    kind: SkikoKeyboardEventKind
+): SkikoKeyboardEvent {
+    return SkikoKeyboardEvent(
+        SkikoKey.valueOf(toSkikoKey(event)),
+        toSkikoModifiers(event),
+        kind,
+        getEventTimestamp(event),
+        event
+    )
+}
+
+internal fun toSkikoScrollEvent(
+    event: WheelEvent,
+): SkikoPointerEvent {
+    return SkikoPointerEvent(
+        x = event.offsetX,
+        y = event.offsetY,
+        deltaX = event.deltaX,
+        deltaY = event.deltaY,
+        pressedButtons = SkikoMouseButtons(buttonsFlags),
+        button = SkikoMouseButtons.NONE,
+        modifiers = toSkikoModifiers(event),
+        kind = SkikoPointerEventKind.SCROLL,
+        timestamp = getEventTimestamp(event),
+        platform = event
+    )
+}
+
+private var buttonsFlags = 0
+private fun toSkikoPressedMouseButtons(
+    event: MouseEvent,
+    kind: SkikoPointerEventKind
+): SkikoMouseButtons {
+    // https://www.w3schools.com/jsref/event_button.asp
+    val button = event.button.toInt()
+    if (kind == SkikoPointerEventKind.DOWN) {
+        buttonsFlags = buttonsFlags.or(getSkikoButtonValue(button))
+        return SkikoMouseButtons(buttonsFlags)
+    }
+    buttonsFlags = buttonsFlags.xor(getSkikoButtonValue(button))
+    return SkikoMouseButtons(buttonsFlags)
+}
+
+private fun toSkikoMouseButton(event: MouseEvent): SkikoMouseButtons {
+    return SkikoMouseButtons(getSkikoButtonValue(event.button.toInt()))
+}
+
+private fun getSkikoButtonValue(button: Int): Int {
+    return when (button) {
+        0 -> SkikoMouseButtons.LEFT.value
+        1 -> SkikoMouseButtons.MIDDLE.value
+        2 -> SkikoMouseButtons.RIGHT.value
+        3 -> SkikoMouseButtons.BUTTON_4.value
+        4 -> SkikoMouseButtons.BUTTON_5.value
+        else -> 0
+    }
+}
+
+private fun toSkikoModifiers(event: MouseEvent): SkikoInputModifiers {
+    var result = 0
+    if (event.altKey) {
+        result = result.or(SkikoInputModifiers.ALT.value)
+    }
+    if (event.shiftKey) {
+        result = result.or(SkikoInputModifiers.SHIFT.value)
+    }
+    if (event.ctrlKey) {
+        result = result.or(SkikoInputModifiers.CONTROL.value)
+    }
+    if (event.metaKey) {
+        result = result.or(SkikoInputModifiers.META.value)
+    }
+    return SkikoInputModifiers(result)
+}
+
+private fun toSkikoModifiers(event: KeyboardEvent): SkikoInputModifiers {
+    var result = 0
+    if (event.altKey) {
+        result = result.or(SkikoInputModifiers.ALT.value)
+    }
+    if (event.shiftKey) {
+        result = result.or(SkikoInputModifiers.SHIFT.value)
+    }
+    if (event.ctrlKey) {
+        result = result.or(SkikoInputModifiers.CONTROL.value)
+    }
+    if (event.metaKey) {
+        result = result.or(SkikoInputModifiers.META.value)
+    }
+    return SkikoInputModifiers(result)
+}
+
+private fun toSkikoKey(event: KeyboardEvent): Int {
+    var key = event.keyCode
+    val side = event.location
+    if (side == KeyboardEvent.DOM_KEY_LOCATION_RIGHT) {
+        if (
+            key == SkikoKey.KEY_LEFT_CONTROL.platformKeyCode ||
+            key == SkikoKey.KEY_LEFT_SHIFT.platformKeyCode ||
+            key == SkikoKey.KEY_LEFT_META.platformKeyCode
+        )
+            key = key.or(0x80000000.toInt())
+    }
+    return key
+}
\ No newline at end of file

skiko/src/wasmJsMain/kotlin/org/jetbrains/skiko/SkiaLayer.js.wasmJs.kt

+package org.jetbrains.skiko
+
+import kotlinx.browser.window
+import org.jetbrains.skiko.w3c.HTMLCanvasElement
+
+import org.w3c.dom.events.KeyboardEvent
+import org.w3c.dom.events.MouseEvent
+import org.w3c.dom.events.WheelEvent
+
+internal actual fun SkiaLayer.bindCanvasEventsToSkikoView(
+    canvas: HTMLCanvasElement
+) {
+    val htmlCanvas = canvas as org.w3c.dom.HTMLCanvasElement
+
+    htmlCanvas.addEventListener("mousedown", { event ->
+        event as MouseEvent
+        isPointerPressed = true
+        skikoView?.onPointerEvent(toSkikoEvent(event, SkikoPointerEventKind.DOWN))
+    })
+    htmlCanvas.addEventListener("mouseup", { event ->
+        event as MouseEvent
+        isPointerPressed = false
+        skikoView?.onPointerEvent(toSkikoEvent(event, SkikoPointerEventKind.UP))
+    })
+    htmlCanvas.addEventListener("mousemove", { event ->
+        event as MouseEvent
+        if (isPointerPressed) {
+            skikoView?.onPointerEvent(toSkikoDragEvent(event))
+        } else {
+            skikoView?.onPointerEvent(toSkikoEvent(event, SkikoPointerEventKind.MOVE))
+        }
+    })
+    htmlCanvas.addEventListener("wheel", { event ->
+        event as WheelEvent
+        skikoView?.onPointerEvent(toSkikoScrollEvent(event))
+    })
+    htmlCanvas.addEventListener("contextmenu", { event ->
+        event.preventDefault()
+    })
+    htmlCanvas.addEventListener("keydown", { event ->
+        event as KeyboardEvent
+        skikoView?.onKeyboardEvent(toSkikoEvent(event, SkikoKeyboardEventKind.DOWN))
+
+        toSkikoTypeEvent(event.key, event)?.let { inputEvent ->
+            skikoView?.input?.onInputEvent(inputEvent)
+        }
+    })
+    htmlCanvas.addEventListener("keyup", { event ->
+        event as KeyboardEvent
+        skikoView?.onKeyboardEvent(toSkikoEvent(event, SkikoKeyboardEventKind.UP))
+    })
+}
+
+actual typealias SkikoGesturePlatformEvent = Any
+actual typealias SkikoPlatformInputEvent = KeyboardEvent
+actual typealias SkikoPlatformKeyboardEvent = KeyboardEvent
+//  MouseEvent is base class of PointerEvent
+actual typealias SkikoPlatformPointerEvent = MouseEvent
+
+internal actual fun SkiaLayer.setOnChangeScaleNotifier() {
+    state?.initCanvas(desiredWidth, desiredHeight, contentScale, this.pixelGeometry)
+    window.matchMedia("(resolution: ${contentScale}dppx)")
+        .addEventListener("change", { setOnChangeScaleNotifier() }, true)
+    onContentScaleChanged?.invoke(contentScale)
+}
\ No newline at end of file

skiko/src/wasmJsMain/kotlin/org/jetbrains/skiko/wasm/GL.kt

@@ -2,7 +2,7 @@
 package org.jetbrains.skiko.wasm
 
 import org.jetbrains.skia.impl.NativePointer
-import org.w3c.dom.HTMLCanvasElement
+import org.jetbrains.skiko.w3c.HTMLCanvasElement
 import kotlin.js.*
 
 internal external object GL : GLInterface {
@@ -11,6 +11,6 @@ internal external object GL : GLInterface {
 }
 
 private external interface GLInterface {
-    fun createContext(context: HTMLCanvasElement, contextAttributes: ContextAttributes): NativePointer;
+    fun createContext(context: HTMLCanvasElement, contextAttributes: ContextAttributes): NativePointer
     fun makeContextCurrent(contextPointer: NativePointer): Boolean;
 }
\ No newline at end of file

skiko/src/wasmJsMain/kotlin/org/jetbrains/skiko/wasm/Wrapper.kt

 package org.jetbrains.skiko.wasm
 
 import org.jetbrains.skia.impl.NativePointer
-import org.w3c.dom.HTMLCanvasElement
+import org.jetbrains.skiko.w3c.HTMLCanvasElement
 
 @JsFun(
 """() => {