MPP: Window.awaitAnimationFrame extension

Author: elizarov

js/js-stub/src/main/kotlin/Performance.kt

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+/*
+ * Copyright 2016-2017 JetBrains s.r.o.
+ *
+ * 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 org.w3c.performance
+
+public abstract class Performance {
+    abstract fun now(): Double
+}

js/js-stub/src/main/kotlin/Window.kt

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+/*
+ * Copyright 2016-2017 JetBrains s.r.o.
+ *
+ * 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 org.w3c.dom
+
+public abstract class Window

js/kotlinx-coroutines-core-js/src/main/kotlin/kotlinx/coroutines/experimental/Window.kt

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+/*
+ * Copyright 2016-2017 JetBrains s.r.o.
+ *
+ * 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 kotlinx.coroutines.experimental
+
+import org.w3c.dom.Window
+
+/**
+ * Suspends coroutine until next JS animation frame and returns frame time on resumption.
+ * The time is consistent with [window.performance.now()][org.w3c.performance.Performance.now].
+ * This function is cancellable. If the [Job] of the current coroutine is completed while this suspending
+ * function is waiting, this function immediately resumes with [CancellationException].
+ */
+public suspend fun Window.awaitAnimationFrame(): Double = suspendCancellableCoroutine { cont ->
+    val handle = requestAnimationFrame { timestamp ->
+        with(cont) { DefaultDispatcher.resumeUndispatched(timestamp) }
+    }
+    cont.invokeOnCompletion {
+        cancelAnimationFrame(handle)
+    }
+}