Input handling (#276)

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

@@ -2,10 +2,9 @@ package org.jetbrains.skiko.sample.js
 
 import kotlinx.browser.document
 import org.jetbrains.skia.Canvas
-import org.jetbrains.skia.Color4f
 import org.jetbrains.skia.Paint
 import org.jetbrains.skia.Rect
-import org.jetbrains.skiko.GenericRenderer
+import org.jetbrains.skiko.GenericSkikoApp
 import org.jetbrains.skiko.SkiaLayer
 import org.jetbrains.skiko.SkiaRenderer
 import org.jetbrains.skiko.wasm.onWasmReady
@@ -34,7 +33,7 @@ fun main() {
             } else {
                 BouncingBalls()
             }
-            skiaLayer.renderer = GenericRenderer(skiaLayer, app)
+            skiaLayer.renderer = GenericSkikoApp(skiaLayer, app)
             skiaLayer.setCanvas(canvas)
             skiaLayer.draw()
         }

samples/SkiaMultiplatformSample/src/commonMain/kotlin/org/jetbrains/skiko/sample/BouncingBalls.kt

 package org.jetbrains.skiko.sample
 
 import org.jetbrains.skia.*
-import org.jetbrains.skiko.SkiaRenderer
+import org.jetbrains.skiko.*
 import kotlin.math.PI
 import kotlin.math.cos
 import kotlin.math.sin
 
-class BouncingBalls: SkiaRenderer {
+class BouncingBalls: SkikoView {
     private data class Circle(var x: Float, var y: Float, var r: Float)
 
     companion object {
@@ -82,7 +82,7 @@ class BouncingBalls: SkiaRenderer {
         Color4f(1f, 0f, 0f, 0.8f).asPaint(),
         Color4f(1f, 0f, 1f, 0.8f).asPaint(),
         Color4f(0f, 1f, 1f, 0.8f).asPaint()
-    ))
+    )).toMutableList()
 
     override fun onRender(canvas: Canvas, width: Int, height: Int, currentTimestamp: Long) {
         val dtime = (currentTimestamp - prevTimestamp)
@@ -93,4 +93,26 @@ class BouncingBalls: SkiaRenderer {
             canvas.drawCircle(ball.circle.x, ball.circle.y, ball.circle.r, paint)
         }
     }
+
+    override fun onInputEvent(event: SkikoInputEvent) {
+        println("onInput: $event")
+    }
+
+    override fun onKeyboardEvent(event: SkikoKeyboardEvent) {
+        println("onKeyboard: $event")
+    }
+
+    override fun onPointerEvent(event: SkikoPointerEvent) {
+        if (event.isLeftClick) {
+            val paint = Color4f(1f, 0f, 0f, 0.8f).asPaint()
+            data += BouncingBall(
+                Circle(event.x.toFloat(), event.y.toFloat(), 25f), 172f, PI / 4) to paint
+        }
+        if (event.isRightClick && data.size > 0) {
+            data.removeLast()
+        }
+        // To avoid log spamming
+        //if (event.kind != SkikoMouseEventKind.MOVE)
+            println("onMouse: $event")
+    }
 }
\ No newline at end of file

samples/SkiaMultiplatformSample/src/commonMain/kotlin/org/jetbrains/skiko/sample/RotatingSquare.kt

 package org.jetbrains.skiko.sample
 
 import org.jetbrains.skia.*
-import org.jetbrains.skiko.SkiaRenderer
+import org.jetbrains.skiko.*
 
-class RotatingSquare : SkiaRenderer {
+class RotatingSquare : SkikoView {
     override fun onRender(canvas: Canvas, width: Int, height: Int, nanoTime: Long) {
         val angleDeg = (nanoTime / 5_000_000) % 360
         val paint = Paint().apply { color = Color.GREEN }
@@ -15,4 +15,16 @@ class RotatingSquare : SkiaRenderer {
         canvas.drawRect(rect, paint)
         canvas.restore()
     }
+
+    override fun onInputEvent(event: SkikoInputEvent) {
+        println("onInput: $event")
+    }
+
+    override fun onKeyboardEvent(event: SkikoKeyboardEvent) {
+        println("onKeyboard: $event")
+    }
+
+    override fun onPointerEvent(event: SkikoPointerEvent) {
+        println("onMouse: $event")
+    }
 }
\ No newline at end of file

samples/SkiaMultiplatformSample/src/iosMain/kotlin/org/jetbrains/skiko/sample/App.ios.kt

@@ -2,11 +2,13 @@
 package org.jetbrains.skiko.sample
 
 import kotlinx.cinterop.*
-import org.jetbrains.skiko.SkiaRenderer
+import org.jetbrains.skiko.GenericSkikoView
+import org.jetbrains.skiko.SkikoView
+import org.jetbrains.skiko.SkikoViewController
 import platform.UIKit.*
 import platform.Foundation.*
 
-fun makeApp(): SkiaRenderer = BouncingBalls()
+fun makeApp(): SkikoView = BouncingBalls()
 
 fun main() {
     val args = emptyArray<String>()
@@ -19,3 +21,28 @@ fun main() {
     }
 }
 
+class SkikoAppDelegate : UIResponder, UIApplicationDelegateProtocol {
+    companion object : UIResponderMeta(), UIApplicationDelegateProtocolMeta
+
+    @ObjCObjectBase.OverrideInit
+    constructor() : super()
+
+    private var _window: UIWindow? = null
+    override fun window() = _window
+    override fun setWindow(window: UIWindow?) {
+        _window = window
+    }
+
+    override fun application(application: UIApplication, didFinishLaunchingWithOptions: Map<Any?, *>?): Boolean {
+        window = UIWindow(frame = UIScreen.mainScreen.bounds)
+        window!!.rootViewController = SkikoViewController().apply {
+            setAppFactory { layer ->
+                GenericSkikoView(layer, makeApp()).also {
+                    layer.skikoView = it
+                }
+            }
+        }
+        window!!.makeKeyAndVisible()
+        return true
+    }
+}

samples/SkiaMultiplatformSample/src/iosMain/kotlin/org/jetbrains/skiko/sample/SkikoAppDelegate.kt

-package org.jetbrains.skiko.sample
-
-import kotlinx.cinterop.*
-import platform.UIKit.*
-
-class SkikoAppDelegate : UIResponder, UIApplicationDelegateProtocol {
-    companion object : UIResponderMeta(), UIApplicationDelegateProtocolMeta
-
-    @ObjCObjectBase.OverrideInit
-    constructor() : super()
-
-    private var _window: UIWindow? = null
-    override fun window() = _window
-    override fun setWindow(window: UIWindow?) {
-        _window = window
-    }
-
-    override fun application(application: UIApplication, didFinishLaunchingWithOptions: Map<Any?, *>?): Boolean {
-        window = UIWindow(frame = UIScreen.mainScreen.bounds)
-        window!!.rootViewController = SkikoViewController()
-        window!!.makeKeyAndVisible()
-        return true
-    }
-}
\ 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 org.jetbrains.skiko.GenericRenderer
+import org.jetbrains.skiko.GenericSkikoView
 import org.jetbrains.skiko.SkiaLayer
 import org.jetbrains.skiko.wasm.onWasmReady
 import org.w3c.dom.HTMLCanvasElement
@@ -9,9 +9,11 @@ import org.w3c.dom.HTMLCanvasElement
 fun main() {
     onWasmReady {
         val skiaLayer = SkiaLayer()
-        skiaLayer.renderer = GenericRenderer(skiaLayer, RotatingSquare())
+        val game = BouncingBalls()
+        skiaLayer.skikoView = GenericSkikoView(skiaLayer, game)
         val canvas = document.getElementById("SkikoTarget") as HTMLCanvasElement
+        canvas.setAttribute("tabindex", "0")
         skiaLayer.setCanvas(canvas)
-        skiaLayer.draw()
+        skiaLayer.needRedraw()
     }
 }

samples/SkiaMultiplatformSample/src/macosMain/kotlin/org/jetbrains/skiko/sample/App.macos.kt

@@ -5,14 +5,24 @@ import platform.AppKit.*
 import org.jetbrains.skia.*
 import org.jetbrains.skiko.*
 import kotlinx.cinterop.*
+import platform.Foundation.NSMakeRect
 
 fun makeApp() = BouncingBalls()
 
 fun main() {
     NSApplication.sharedApplication()
-    val layer = SkiaLayer()
-    val window = SkiaWindow(layer)
-    layer.renderer = GenericRenderer(layer, makeApp())
-    window.nsWindow.orderFrontRegardless()
+    val windowStyle = NSWindowStyleMaskTitled or
+                NSWindowStyleMaskMiniaturizable or
+                NSWindowStyleMaskClosable or
+                NSWindowStyleMaskResizable
+    val window = NSWindow(
+        contentRect = NSMakeRect(0.0, 0.0, 640.0, 480.0),
+        styleMask = windowStyle,
+        backing = NSBackingStoreBuffered,
+        defer = true)
+    val skiaLayer = SkiaLayer()
+    skiaLayer.skikoView = GenericSkikoView(skiaLayer, makeApp())
+    skiaLayer.initLayer(window)
+    window.orderFrontRegardless()
     NSApp?.run()
 }

skiko/src/commonMain/kotlin/org/jetbrains/skiko/Events.kt

+package org.jetbrains.skiko
+
+// Clicked mouse buttons bitmask.
+object SkikoMouseButtons {
+    const val NONE = 0
+    const val LEFT = 1 shl 0
+    const val RIGHT = 1 shl 1
+    const val MIDDLE = 1 shl 2
+}
+
+expect class SkikoPlatformInputEvent
+data class SkikoInputEvent(
+    val input: String,
+    val platform: SkikoPlatformInputEvent?
+)
+
+enum class SkikoKeyboardEventKind {
+    UP, DOWN
+}
+expect class SkikoPlatformKeyboardEvent
+data class SkikoKeyboardEvent(
+    val code: Int,
+    val kind: SkikoKeyboardEventKind,
+    val platform: SkikoPlatformKeyboardEvent?
+)
+
+enum class SkikoPointerEventKind {
+    UP, DOWN, MOVE
+}
+expect class SkikoPlatformPointerEvent
+data class SkikoPointerEvent(
+    val x: Double, val y: Double,
+    val buttonMask: Int,
+    val kind: SkikoPointerEventKind,
+    val platform: SkikoPlatformPointerEvent?
+)
+
+val SkikoPointerEvent.isLeftClick: Boolean
+    get() = (buttonMask and SkikoMouseButtons.LEFT) != 0 && (kind == SkikoPointerEventKind.UP)
+
+val SkikoPointerEvent.isRightClick: Boolean
+    get() = (buttonMask and SkikoMouseButtons.RIGHT) != 0 && (kind == SkikoPointerEventKind.UP)
+

skiko/src/commonMain/kotlin/org/jetbrains/skiko/SkiaLayer.kt

 package org.jetbrains.skiko
 
-import org.jetbrains.skia.Canvas
 import org.jetbrains.skia.Picture
 
 expect open class SkiaLayer {
@@ -9,25 +8,9 @@ expect open class SkiaLayer {
     var fullscreen: Boolean
     var transparency: Boolean
 
-    var renderer: SkiaRenderer?
+    var skikoView: SkikoView?
 
     fun needRedraw()
 }
 
-interface SkiaRenderer {
-    fun onRender(canvas: Canvas, width: Int, height: Int, nanoTime: Long)
-}
-
-open class GenericRenderer(
-    val layer: SkiaLayer,
-    val app: SkiaRenderer
-): SkiaRenderer {
-    override fun onRender(canvas: Canvas, width: Int, height: Int, nanoTime: Long) {
-        val contentScale = layer.contentScale
-        canvas.scale(contentScale, contentScale)
-        app.onRender(canvas, (width / contentScale).toInt(), (height / contentScale).toInt(), nanoTime)
-        layer.needRedraw()
-    }
-}
-
 internal class PictureHolder(val instance: Picture, val width: Int, val height: Int)

skiko/src/commonMain/kotlin/org/jetbrains/skiko/SkikoView.kt

+package org.jetbrains.skiko
+
+import org.jetbrains.skia.Canvas
+
+interface SkikoView {
+    // Input
+    fun onKeyboardEvent(event: SkikoKeyboardEvent)
+    fun onPointerEvent(event: SkikoPointerEvent)
+    fun onInputEvent(event: SkikoInputEvent)
+
+    // Rendering
+    fun onRender(canvas: Canvas, width: Int, height: Int, nanoTime: Long)
+}
+
+open class GenericSkikoView(
+        val layer: SkiaLayer,
+        val app: SkikoView
+    ): SkikoView {
+
+    override fun onRender(canvas: Canvas, width: Int, height: Int, nanoTime: Long) {
+        val contentScale = layer.contentScale
+        canvas.scale(contentScale, contentScale)
+        app.onRender(canvas, (width / contentScale).toInt(), (height / contentScale).toInt(), nanoTime)
+        // Request next frame immediately.
+        layer.needRedraw()
+    }
+
+    override fun onInputEvent(event: SkikoInputEvent) {
+        app.onInputEvent(event)
+    }
+
+    override fun onKeyboardEvent(event: SkikoKeyboardEvent) {
+        app.onKeyboardEvent(event)
+    }
+
+    override fun onPointerEvent(event: SkikoPointerEvent) {
+        app.onPointerEvent(event)
+    }
+}
+
+abstract class NoInputSkikoView: SkikoView {
+
+    override fun onInputEvent(event: SkikoInputEvent) {
+    }
+
+    override fun onKeyboardEvent(event: SkikoKeyboardEvent) {
+    }
+
+    override fun onPointerEvent(event: SkikoPointerEvent) {
+    }
+}

samples/SkiaMultiplatformSample/src/iosMain/kotlin/org/jetbrains/skiko/sample/SkikoViewController.kt → skiko/src/iosMain/kotlin/SkikoViewController.kt

-package org.jetbrains.skiko.sample
+package org.jetbrains.skiko
 
-import kotlinx.cinterop.*
-import kotlinx.coroutines.runBlocking
-import org.jetbrains.skiko.GenericRenderer
-import org.jetbrains.skiko.SkiaLayer
-import platform.CoreGraphics.CGRect
+import kotlinx.cinterop.ExportObjCClass
+import kotlinx.cinterop.useContents
 import platform.CoreGraphics.CGRectMake
-import platform.Foundation.*
-import platform.UIKit.*
 import platform.Foundation.NSCoder
+import platform.UIKit.UIEvent
+import platform.UIKit.UIScreen
+import platform.UIKit.UIViewController
+import platform.UIKit.setFrame
 
 @ExportObjCClass
 class SkikoViewController : UIViewController {
-
     @OverrideInit
     constructor() : super(nibName = null, bundle = null)
 
     @OverrideInit
     constructor(coder: NSCoder) : super(coder)
 
+    override fun touchesBegan(touches: Set<*>, withEvent: UIEvent?) {
+        println("touchesBegan: $withEvent")
+        super.touchesBegan(touches, withEvent)
+    }
+
+    override fun touchesEnded(touches: Set<*>, withEvent: UIEvent?) {
+        println("touchesEnded $withEvent")
+        super.touchesEnded(touches, withEvent)
+    }
+
+    internal lateinit var appFactory: (SkiaLayer) -> SkikoView
+    fun setAppFactory(appFactory: (SkiaLayer) -> SkikoView) {
+        this.appFactory = appFactory
+    }
+
     override fun viewDidLoad() {
         super.viewDidLoad()
 
         val (width, height) = UIScreen.mainScreen.bounds.useContents {
             this.size.width to this.size.height
         }
+        val layer = SkiaLayer().apply {
+            skikoView = appFactory(this)
+        }
         view.setFrame(CGRectMake(0.0, 0.0, width, height))
-        val layer = SkiaLayer(width.toFloat(), height.toFloat())
-        layer.renderer = GenericRenderer(layer, makeApp())
-        layer.initLayer(view)
+        layer.initLayer(this)
     }
 }

skiko/src/iosMain/kotlin/org/jetbrains/skiko/SkiaLayer.ios.kt

 package org.jetbrains.skiko
 
+import kotlinx.cinterop.ObjCAction
+import kotlinx.cinterop.useContents
 import org.jetbrains.skia.PictureRecorder
 import org.jetbrains.skia.Rect
 import org.jetbrains.skiko.context.MetalContextHandler
 import org.jetbrains.skiko.redrawer.MetalRedrawer
+import platform.Foundation.NSSelectorFromString
 import platform.UIKit.*
+import platform.darwin.NSObject
 
 actual open class SkiaLayer(
-    var width: Float, var height: Float,
     val properties: SkiaLayerProperties = makeDefaultSkiaLayerProperties()
-)
-{
+) {
     fun isShowing(): Boolean {
         return true
     }
@@ -34,16 +36,50 @@ actual open class SkiaLayer(
         redrawer?.needRedraw()
     }
 
+    val width: Float
+       get() = view.frame.useContents {
+           return@useContents size.width.toFloat()
+       }
+
+    val height: Float
+        get() = view.frame.useContents {
+            return@useContents size.height.toFloat()
+        }
+
     lateinit var view: UIView
+    // We need to keep reference to controller as Objective-C will only keep weak reference here.
+    lateinit private var controller: NSObject
+
+    fun initLayer(viewController: SkikoViewController) {
+        this.view = viewController.view
 
-    fun initLayer(view: UIView) {
-        println("SkiaLayer.initLayer")
-        this.view = view
+        // See https://developer.apple.com/documentation/uikit/touches_presses_and_gestures/using_responders_and_the_responder_chain_to_handle_events?language=objc
+        controller = object : NSObject() {
+            @ObjCAction
+            fun onTap(sender: UITapGestureRecognizer) {
+                val (x, y) = sender.locationInView(view).useContents {
+                    x to y
+                }
+                // TODO: rework events using https://developer.apple.com/documentation/uikit/uiresponder/1621142-touchesbegan?language=objc
+                skikoView?.onPointerEvent(
+                    SkikoPointerEvent(x, y,
+                        SkikoMouseButtons.LEFT, SkikoPointerEventKind.DOWN,
+                        null))
+                skikoView?.onPointerEvent(
+                    SkikoPointerEvent(x, y,
+                        SkikoMouseButtons.LEFT, SkikoPointerEventKind.UP,
+                null))
+            }
+
+        }
+        // We have ':' in selector to take care of function argument.
+        view.addGestureRecognizer(UITapGestureRecognizer(controller, NSSelectorFromString("onTap:")))
         redrawer = MetalRedrawer(this, properties)
         redrawer?.redrawImmediately()
     }
 
-    actual var renderer: SkiaRenderer? = null
+    actual var skikoView: SkikoView? = null
+
     internal var redrawer: MetalRedrawer? = null
     private var picture: PictureHolder? = null
     private val pictureRecorder = PictureRecorder()
@@ -55,7 +91,7 @@ actual open class SkiaLayer(
 
         val bounds = Rect.makeWH(pictureWidth, pictureHeight)
         val canvas = pictureRecorder.beginRecording(bounds)
-        renderer?.onRender(canvas, pictureWidth.toInt(), pictureHeight.toInt(), nanoTime)
+        skikoView?.onRender(canvas, pictureWidth.toInt(), pictureHeight.toInt(), nanoTime)
         val picture = pictureRecorder.finishRecordingAsPicture()
         this.picture = PictureHolder(picture, pictureWidth.toInt(), pictureHeight.toInt())
     }
@@ -75,3 +111,8 @@ actual open class SkiaLayer(
         }
     }
 }
+
+// TODO: do properly
+actual typealias SkikoPlatformInputEvent = UIEvent
+actual typealias SkikoPlatformKeyboardEvent = UIEvent
+actual typealias SkikoPlatformPointerEvent = UIEvent
\ No newline at end of file

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

@@ -2,6 +2,9 @@ package org.jetbrains.skiko
 
 import org.jetbrains.skiko.wasm.api.CanvasRenderer
 import org.w3c.dom.HTMLCanvasElement
+import org.w3c.dom.events.InputEvent
+import org.w3c.dom.events.KeyboardEvent
+import org.w3c.dom.events.MouseEvent
 
 actual open class SkiaLayer(properties: SkiaLayerProperties = makeDefaultSkiaLayerProperties()
 ) {
@@ -12,28 +15,89 @@ actual open class SkiaLayer(properties: SkiaLayerProperties = makeDefaultSkiaLay
         get() = 1.0f
     actual var fullscreen: Boolean
         get() = false
-        set(value) = throw Exception("Fullscreen is not supported!")
+        set(value) {
+            if (value) throw Exception("Fullscreen is not supported!")
+        }
     actual var transparency: Boolean
         get() = false
-        set(value) = throw Exception("Transparency is not supported!")
+        set(value) {
+            if (value) throw Exception("Transparency is not supported!")
+        }
 
     actual fun needRedraw() {
         draw()
     }
 
-    actual var renderer: SkiaRenderer? = null
+    actual var skikoView: SkikoView? = null
+
+    fun translatePointerEvent(
+        event: MouseEvent,
+        buttons: Boolean,
+        kind: SkikoPointerEventKind
+    ): SkikoPointerEvent {
+        var mask = SkikoMouseButtons.NONE
+        if (buttons && event.button.toInt() == 0)
+            mask = mask or SkikoMouseButtons.LEFT
+        // https://www.w3schools.com/jsref/event_button.asp
+        if (buttons && event.button.toInt() == 2)
+            mask = mask or SkikoMouseButtons.RIGHT
+        return SkikoPointerEvent(
+            event.offsetX, event.offsetY,
+            mask, kind, event
+        )
+    }
 
     fun setCanvas(htmlCanvas: HTMLCanvasElement) {
         state = object: CanvasRenderer(htmlCanvas) {
             override fun drawFrame(currentTimestamp: Double) {
-                // currentTimestamp is milliseconds.
-                val currentNanos = currentTimestamp * 1000000
-                renderer?.onRender(canvas, width, height, currentNanos.toLong())
+                // currentTimestamp is in milliseconds.
+                val currentNanos = currentTimestamp * 1_000_000
+                skikoView?.onRender(canvas, width, height, currentNanos.toLong())
             }
         }
+        // See https://www.w3schools.com/jsref/dom_obj_event.asp
+        // https://developer.mozilla.org/en-US/docs/Web/API/Pointer_events
+        htmlCanvas.addEventListener("pointerdown", { event ->
+            event as MouseEvent
+            skikoView?.onPointerEvent(translatePointerEvent(
+                event, true, SkikoPointerEventKind.DOWN))
+        })
+        htmlCanvas.addEventListener("pointerup", { event ->
+            event as MouseEvent
+            var mask = SkikoMouseButtons.NONE
+            skikoView?.onPointerEvent(translatePointerEvent(
+                event, true, SkikoPointerEventKind.UP))
+        })
+        htmlCanvas.addEventListener("pointermove", { event ->
+            event as MouseEvent
+            skikoView?.onPointerEvent(translatePointerEvent(
+                event, false, SkikoPointerEventKind.MOVE))
+        })
+        htmlCanvas.addEventListener("contextmenu", { event ->
+            event.preventDefault()
+        })
+        htmlCanvas.addEventListener("keydown", { event ->
+            event as KeyboardEvent
+            skikoView?.onKeyboardEvent(
+                    SkikoKeyboardEvent(
+                    event.keyCode, SkikoKeyboardEventKind.DOWN, event
+                )
+            )
+        })
+        htmlCanvas.addEventListener("keyup", { event ->
+            event as KeyboardEvent
+            skikoView?.onKeyboardEvent(SkikoKeyboardEvent(
+                event.keyCode, SkikoKeyboardEventKind.UP, event
+            ))
+        })
     }
 
     fun draw() {
         state?.draw()
     }
 }
+
+actual typealias SkikoPlatformInputEvent = InputEvent
+actual typealias SkikoPlatformKeyboardEvent = KeyboardEvent
+//  MouseEvent is base class of PointerEvent
+actual typealias SkikoPlatformPointerEvent = MouseEvent

skiko/src/jsMain/kotlin/org/jetbrains/skiko/wasm/api/CanvasRenderer.kt

@@ -12,7 +12,6 @@ import org.jetbrains.skiko.wasm.CreateWebGLContext
 import org.jetbrains.skiko.wasm.GL
 import org.w3c.dom.HTMLCanvasElement
 
-
 fun Surface.Companion.createFromGL(width: Int, height: Int) = makeFromBackendRenderTarget(
     DirectContext.makeGL(),
     BackendRenderTarget.makeGL(
@@ -31,7 +30,7 @@ abstract class CanvasRenderer constructor(htmlCanvas: HTMLCanvasElement, val wid
         GL.makeContextCurrent(contextPointer)
     }
 
-    val surface = Surface.createFromGL(width, height)
+    private val surface = Surface.createFromGL(width, height)
     val canvas: Canvas
         get() = surface.canvas
 

skiko/src/jvmMain/kotlin/org/jetbrains/skiko/SkiaLayer.jvm.kt

@@ -8,7 +8,6 @@ import org.jetbrains.skia.ColorType
 import org.jetbrains.skia.ColorSpace
 import org.jetbrains.skia.ClipMode
 import org.jetbrains.skia.ImageInfo
-import org.jetbrains.skia.Picture
 import org.jetbrains.skia.PictureRecorder
 import org.jetbrains.skia.Rect
 import org.jetbrains.skiko.context.ContextHandler
@@ -123,7 +122,8 @@ actual open class SkiaLayer internal constructor(
             backedLayer.fullscreen = value
         }
 
-    actual var renderer: SkiaRenderer? = null
+    actual var skikoView: SkikoView? = null
+
     val clipComponents = mutableListOf<ClipRectangle>()
 
     @Volatile
@@ -340,7 +340,7 @@ actual open class SkiaLayer internal constructor(
 
         try {
             isRendering = true
-            renderer?.onRender(canvas, pictureWidth, pictureHeight, nanoTime)
+            skikoView?.onRender(canvas, pictureWidth, pictureHeight, nanoTime)
         } finally {
             isRendering = false
         }
@@ -443,3 +443,8 @@ actual open class SkiaLayer internal constructor(
         return rounded.toInt()
     }
 }
+
+// InputEvent is abstract, so we wrap to match modality.
+actual class SkikoPlatformInputEvent(val wrapped: InputEvent)
+actual typealias SkikoPlatformKeyboardEvent = KeyEvent
+actual typealias SkikoPlatformPointerEvent = MouseEvent
\ No newline at end of file

skiko/src/jvmTest/kotlin/org/jetbrains/skiko/SkiaWindowPerformanceTest.kt

@@ -71,7 +71,7 @@ native crash in SkiaWindowTest "render single window"
         init {
             setSize(width, height)
             defaultCloseOperation = WindowConstants.DISPOSE_ON_CLOSE
-            layer.renderer = object : SkiaRenderer {
+            layer.skikoView = object : NoInputSkikoView() {
                 override fun onRender(canvas: Canvas, width: Int, height: Int, nanoTime: Long) {
                     if (canCollect && frameTimes.size < frameCount) {
                         frameTimes.add(System.nanoTime()) // we check the real time, not the time provided by the argument
@@ -181,7 +181,7 @@ j  org.jetbrains.skiko.redrawer.MacOsRedrawer$drawLayer$1.draw()V+7
         val smoothFPSCounter = FPSCounter(count = frameCheckCount)
         val onComplete = CompletableDeferred<Unit>()
 
-        fun renderer(window: SkiaWindow) = object : SkiaRenderer {
+        fun renderer(window: SkiaWindow) = object : NoInputSkikoView() {
             var t1 = Long.MAX_VALUE
             val refreshRate = window.graphicsConfiguration.device.displayMode.refreshRate
 
@@ -223,7 +223,7 @@ j  org.jetbrains.skiko.redrawer.MacOsRedrawer$drawLayer$1.draw()V+7
             window.isVisible = true
 
             delay(1000)
-            window.layer.renderer = renderer(window)
+            window.layer.skikoView = renderer(window)
             window.layer.needRedraw()
 
             onComplete.await()

skiko/src/jvmTest/kotlin/org/jetbrains/skiko/SkiaWindowTest.kt

@@ -54,15 +54,15 @@ class SkiaWindowTest {
             window.setLocation(200, 200)
             window.setSize(400, 200)
             window.defaultCloseOperation = WindowConstants.DISPOSE_ON_CLOSE
-            val renderer = RectRenderer(window.layer, 200, 100, Color.RED)
-            window.layer.renderer = renderer
+            val app = RectRenderer(window.layer, 200, 100, Color.RED)
+            window.layer.skikoView = app
             window.isUndecorated = true
             window.isVisible = true
 
             delay(1000)
             screenshots.assert(window.bounds, "frame1")
 
-            renderer.rectWidth = 100
+            app.rectWidth = 100
             window.layer.needRedraw()
             delay(1000)
             screenshots.assert(window.bounds, "frame2")
@@ -78,8 +78,8 @@ class SkiaWindowTest {
             window.setLocation(200, 200)
             window.preferredSize = Dimension(400, 200)
             window.defaultCloseOperation = WindowConstants.DISPOSE_ON_CLOSE
-            val renderer = RectRenderer(window.layer, 200, 100, Color.RED)
-            window.layer.renderer = renderer
+            val app = RectRenderer(window.layer, 200, 100, Color.RED)
+            window.layer.skikoView = app
             window.isUndecorated = true
             window.pack()
             window.paint(window.graphics)
@@ -88,7 +88,7 @@ class SkiaWindowTest {
             delay(1000)
             screenshots.assert(window.bounds, "frame1")
 
-            renderer.rectWidth = 100
+            app.rectWidth = 100
             window.layer.needRedraw()
             delay(1000)
             screenshots.assert(window.bounds, "frame2")
@@ -104,7 +104,7 @@ class SkiaWindowTest {
             window.setLocation(200, 200)
             window.setSize(40, 20)
             window.defaultCloseOperation = WindowConstants.DISPOSE_ON_CLOSE
-            window.layer.renderer = RectRenderer(window.layer, 20, 10, Color.RED)
+            window.layer.skikoView = RectRenderer(window.layer, 20, 10, Color.RED)
             window.isUndecorated = true
             window.isVisible = true
             delay(1000)
@@ -124,7 +124,7 @@ class SkiaWindowTest {
             setLocation(200,200)
             setSize(400, 200)
             defaultCloseOperation = WindowConstants.DISPOSE_ON_CLOSE
-            layer.renderer = RectRenderer(layer, 200, 100, color)
+            layer.skikoView = RectRenderer(layer, 200, 100, color)
             isUndecorated = true
             isVisible = true
         }
@@ -163,7 +163,7 @@ class SkiaWindowTest {
             window.setLocation(200, 200)
             window.setSize(40, 20)
             window.defaultCloseOperation = WindowConstants.DISPOSE_ON_CLOSE
-            window.layer.renderer = object : SkiaRenderer {
+            window.layer.skikoView = object : NoInputSkikoView() {
                 override fun onRender(canvas: Canvas, width: Int, height: Int, nanoTime: Long) {
                     renderCount++
                 }
@@ -194,7 +194,7 @@ class SkiaWindowTest {
             setLocation(200,200)
             setSize(40, 20)
             defaultCloseOperation = WindowConstants.DISPOSE_ON_CLOSE
-            layer.renderer = if (isAnimated) {
+            layer.skikoView = if (isAnimated) {
                 AnimatedBoxRenderer(layer, pixelsPerSecond = 20.0, size = 20.0)
             } else {
                 RectRenderer(layer, 20, 10, Color.RED)
@@ -238,7 +238,7 @@ class SkiaWindowTest {
             setLocation(200,200)
             setSize(400, 200)
             defaultCloseOperation = WindowConstants.DISPOSE_ON_CLOSE
-            layer.renderer = AnimatedBoxRenderer(layer, pixelsPerSecond = 20.0, size = 20.0)
+            layer.skikoView = AnimatedBoxRenderer(layer, pixelsPerSecond = 20.0, size = 20.0)
             isVisible = true
         }
 
@@ -262,7 +262,7 @@ class SkiaWindowTest {
             setSize(400, 200)
             preferredSize = Dimension(400, 200)
             defaultCloseOperation = WindowConstants.DISPOSE_ON_CLOSE
-            layer.renderer = object : SkiaRenderer {
+            layer.skikoView = object : NoInputSkikoView() {
                 override fun onRender(canvas: Canvas, width: Int, height: Int, nanoTime: Long) {
                 }
             }
@@ -364,15 +364,15 @@ class SkiaWindowTest {
             window.setLocation(200, 200)
             window.setSize(400, 200)
             window.defaultCloseOperation = WindowConstants.DISPOSE_ON_CLOSE
-            val renderer = RectRenderer(window.layer, 200, 100, Color.RED)
-            window.layer.renderer = renderer
+            val app = RectRenderer(window.layer, 200, 100, Color.RED)
+            window.layer.skikoView = app
             window.isUndecorated = true
             window.isVisible = true
 
             delay(1000)
             screenshots.assert(window.bounds, "frame1", "testFallbackToSoftware")
 
-            renderer.rectWidth = 100
+            app.rectWidth = 100
             window.layer.needRedraw()
             delay(1000)
             screenshots.assert(window.bounds, "frame2", "testFallbackToSoftware")
@@ -424,7 +424,7 @@ class SkiaWindowTest {
             window.setLocation(200, 200)
             window.setSize(400, 200)
             window.defaultCloseOperation = WindowConstants.DISPOSE_ON_CLOSE
-            window.layer.renderer = object : SkiaRenderer {
+            window.layer.skikoView = object : NoInputSkikoView() {
                 override fun onRender(canvas: Canvas, width: Int, height: Int, nanoTime: Long) {
                     drawCount++
 
@@ -470,7 +470,7 @@ class SkiaWindowTest {
 
             val paragraph by lazy { paragraph(window.layer.contentScale * 40, "=-+Нп") }
 
-            window.layer.renderer = object : SkiaRenderer {
+            window.layer.skikoView = object : NoInputSkikoView() {
                 override fun onRender(canvas: Canvas, width: Int, height: Int, nanoTime: Long) {
                     paragraph.layout(Float.POSITIVE_INFINITY)
                     paragraph.paint(canvas, 0f, 0f)
@@ -502,7 +502,7 @@ class SkiaWindowTest {
         var rectWidth: Int,
         var rectHeight: Int,
         private val rectColor: Color
-    ) : SkiaRenderer {
+    ) : NoInputSkikoView() {
         override fun onRender(canvas: Canvas, width: Int, height: Int, nanoTime: Long) {
             val dpi = layer.contentScale
             canvas.drawRect(Rect(0f, 0f, width.toFloat(), height.toFloat()), Paint().apply {
@@ -518,7 +518,7 @@ class SkiaWindowTest {
         private val layer: SkiaLayer,
         private val pixelsPerSecond: Double,
         private val size: Double
-    ) : SkiaRenderer {
+    ) : NoInputSkikoView() {
         private var oldNanoTime = Long.MAX_VALUE
         private var x = 0.0
 

skiko/src/linuxMain/kotlin/org/jetbrains/skiko/Actuals.linux.kt

@@ -7,7 +7,6 @@ internal actual fun createNativeContextHandler(layer: SkiaLayer, renderApi: Grap
     TODO()
 }
 
-
 internal actual fun createNativeRedrawer(
     layer: SkiaLayer,
     renderApi: GraphicsApi,

skiko/src/linuxMain/kotlin/org/jetbrains/skiko/SkiaLayer.linux.kt

@@ -15,5 +15,10 @@ actual open class SkiaLayer(properties: SkiaLayerProperties)  {
     actual fun needRedraw() {
         TODO("unimplemented")
     }
-    actual var renderer: SkiaRenderer? = null
+    actual var skikoView: SkikoView? = null
 }
+
+// TODO: do properly
+actual typealias SkikoPlatformInputEvent = Any
+actual typealias SkikoPlatformKeyboardEvent = Any
+actual typealias SkikoPlatformPointerEvent = Any
\ No newline at end of file

skiko/src/macosMain/kotlin/org/jetbrains/skiko/SkiaLayer.macos.kt

@@ -4,7 +4,7 @@ import kotlinx.cinterop.useContents
 import org.jetbrains.skiko.context.*
 import org.jetbrains.skia.*
 import org.jetbrains.skiko.redrawer.Redrawer
-import platform.AppKit.NSView
+import platform.AppKit.*
 import platform.Foundation.NSMakeRect
 
 actual open class SkiaLayer(
@@ -26,10 +26,10 @@ actual open class SkiaLayer(
             if (value) throw IllegalArgumentException("transparency unsupported")
         }
 
-    val nsView = NSView(NSMakeRect(0.0, 0.0, 640.0, 480.0))
+    lateinit var nsView: NSView
     var _contentScale: Float = 1.0f
 
-    actual var renderer: SkiaRenderer? = null
+    actual var skikoView: SkikoView? = null
 
     private var contextHandler = MacOSOpenGLContextHandler(this)
 
@@ -38,8 +38,75 @@ actual open class SkiaLayer(
     private var picture: PictureHolder? = null
     private val pictureRecorder = PictureRecorder()
 
-    fun initLayer() {
-        println("SkiaLayer.initLayer")
+    private fun eventToMouse(event: NSEvent, kind: SkikoPointerEventKind): SkikoPointerEvent {
+        var buttons = SkikoMouseButtons.NONE
+        val mask = event.buttonMask.toInt()
+        if ((mask and 1) != 0 || event.buttonNumber == 0L) {
+            buttons = buttons or SkikoMouseButtons.LEFT
+        }
+        if ((mask and 2) != 0 || event.buttonNumber == 1L) {
+            buttons = buttons or SkikoMouseButtons.RIGHT
+        }
+        var (x, y) = event.locationInWindow.useContents {
+            this.x to this.y
+        }
+        // Translate.
+        nsView.frame.useContents {
+           y = size.height - y
+        }
+        return SkikoPointerEvent(x, y, buttons, kind, event)
+    }
+
+    private fun eventToKeyboard(event: NSEvent, kind: SkikoKeyboardEventKind): SkikoKeyboardEvent {
+         return SkikoKeyboardEvent(event.keyCode.toInt(), kind, event)
+    }
+
+    fun initLayer(window: NSWindow) {
+        val (width, height) = window.contentLayoutRect.useContents {
+            this.size.width to this.size.height
+        }
+        nsView = object : NSView(NSMakeRect(0.0, 0.0, width, height)) {
+            private var trackingArea : NSTrackingArea? = null
+            override fun acceptsFirstResponder(): Boolean {
+                return true
+            }
+            override fun viewWillMoveToWindow(newWindow: NSWindow?) {
+                updateTrackingAreas()
+            }
+            override fun updateTrackingAreas() {
+                bounds.useContents {
+                    println("update tracking areas to ${this.size.width} ${this.size.height}")
+                }
+                trackingArea?.let { removeTrackingArea(it) }
+                trackingArea = NSTrackingArea(rect = bounds,
+                    options = NSMouseMoved or NSTrackingActiveAlways, // NSTrackingActiveInActiveApp,
+                    owner = nsView, userInfo = null)
+                nsView.addTrackingArea(trackingArea!!)
+            }
+
+            override fun rightMouseDown(event: NSEvent) {
+                skikoView?.onPointerEvent(eventToMouse(event, SkikoPointerEventKind.DOWN))
+            }
+            override fun rightMouseUp(event: NSEvent) {
+                skikoView?.onPointerEvent(eventToMouse(event, SkikoPointerEventKind.UP))
+            }
+            override fun mouseDown(event: NSEvent) {
+                skikoView?.onPointerEvent(eventToMouse(event, SkikoPointerEventKind.DOWN))
+            }
+            override fun mouseUp(event: NSEvent) {
+                skikoView?.onPointerEvent(eventToMouse(event, SkikoPointerEventKind.UP))
+            }
+            override fun mouseMoved(event: NSEvent) {
+                skikoView?.onPointerEvent(eventToMouse(event, SkikoPointerEventKind.MOVE))
+            }
+            override fun keyDown(event: NSEvent) {
+                skikoView?.onKeyboardEvent(eventToKeyboard(event, SkikoKeyboardEventKind.DOWN))
+            }
+            override fun keyUp(event: NSEvent) {
+                skikoView?.onKeyboardEvent(eventToKeyboard(event, SkikoKeyboardEventKind.UP))
+            }
+        }
+        window.contentView!!.addSubview(nsView)
         redrawer = createNativeRedrawer(this, GraphicsApi.OPENGL, properties)
         redrawer?.redrawImmediately()
     }
@@ -55,8 +122,6 @@ actual open class SkiaLayer(
     }
 
     fun update(nanoTime: Long) {
-        println("SkiaLayer.update")
-
         val width = nsView.frame.useContents { size.width }
         val height = nsView.frame.useContents { size.height }
 
@@ -65,7 +130,7 @@ actual open class SkiaLayer(
 
         val bounds = Rect.makeWH(pictureWidth.toFloat(), pictureHeight.toFloat())
         val canvas = pictureRecorder.beginRecording(bounds)
-        renderer?.onRender(canvas, pictureWidth.toInt(), pictureHeight.toInt(), nanoTime)
+        skikoView?.onRender(canvas, pictureWidth.toInt(), pictureHeight.toInt(), nanoTime)
 
         val picture = pictureRecorder.finishRecordingAsPicture()
         this.picture = PictureHolder(picture, pictureWidth.toInt(), pictureHeight.toInt())
@@ -74,7 +139,6 @@ actual open class SkiaLayer(
     private var initedCanvas = false
 
     fun draw() {
-        println("SkiaLayer.draw")
         contextHandler.apply {
             if (!initedCanvas) {
                 if (!initContext()) {
@@ -86,7 +150,6 @@ actual open class SkiaLayer(
             }
             clearCanvas()
             val picture = picture
-            println("SkiaLayer.draw: picture=$picture")
             if (picture != null) {
                 drawOnCanvas(picture.instance)
             }
@@ -95,3 +158,7 @@ actual open class SkiaLayer(
     }
 }
 
+// TODO: do properly
+actual typealias SkikoPlatformInputEvent = NSEvent
+actual typealias SkikoPlatformKeyboardEvent = NSEvent
+actual typealias SkikoPlatformPointerEvent = NSEvent

skiko/src/macosMain/kotlin/org/jetbrains/skiko/SkiaWindow.macos.kt

-package org.jetbrains.skiko
-
-import platform.AppKit.*
-import platform.Foundation.*
-
-class SkiaWindow(layer: SkiaLayer) {
-    private val windowStyle =
-        NSWindowStyleMaskTitled or
-        NSWindowStyleMaskMiniaturizable or
-        NSWindowStyleMaskClosable or
-        NSWindowStyleMaskResizable
-
-    // TODO: what's the proper way to create window here?
-    // Should we subclass NSWindow?
-    // Provide multiple constructors for SkiaWindow?
-    // Behave similar to Skiko/JVM?
-    val nsWindow = NSWindow(
-        contentRect = NSMakeRect(0.0, 0.0, 640.0, 480.0),
-        styleMask = windowStyle,
-        backing =  NSBackingStoreBuffered,
-        defer = true)
-
-    init {
-        nsWindow.contentView!!.addSubview(layer.nsView)
-        layer.initLayer()
-    }
-}

skiko/src/macosMain/kotlin/org/jetbrains/skiko/context/OpenGLContextHandler.macos.kt

@@ -9,7 +9,6 @@ import platform.OpenGLCommon.GLenum
 
 internal class MacOSOpenGLContextHandler(layer: SkiaLayer) : ContextHandler(layer) {
     override fun initContext(): Boolean {
-        println("MacOSOpenGLContextHandler.initContext")
         try {
             if (context == null) {
                 context = DirectContext.makeGL()
@@ -33,7 +32,6 @@ internal class MacOSOpenGLContextHandler(layer: SkiaLayer) : ContextHandler(laye
     }
 
     override fun initCanvas() {
-        println("MacOSOpenGLContextHandler.initCanvas")
         val scale = layer.contentScale
         val w = (layer.nsView.frame.useContents { size.width } * scale).toInt().coerceAtLeast(0)
         val h = (layer.nsView.frame.useContents { size.height } * scale).toInt().coerceAtLeast(0)

skiko/src/macosMain/kotlin/org/jetbrains/skiko/redrawer/OpenGLRedrawer.macos.kt

@@ -103,8 +103,6 @@ class MacosGLLayer(val layer: SkiaLayer, setNeedsDisplayOnBoundsChange: Boolean)
         displayTime: CPointer<CVTimeStamp>?
     ) {
         CGLSetCurrentContext(ctx);
-        println("MacosGLLayer::drawInCGLContext")
-
         performDraw()
 
         //context.flush() // TODO: I thought the below should call context.flush().