Sync with latest from upstream repository

.gitignore

@@ -59,4 +59,4 @@ jsconfig.json
 dist/
 
 # generated by bob
-lib/
+/lib/

README.md

@@ -17,7 +17,7 @@ Check out our dedicated documentation page for info about this library, API refe
 
 ## Examples
 
-If you want to play with the API but don't feel like trying it on a real app, you can run the example project. Clone the repo, go to the `Example/` folder and run:
+If you want to play with the API but don't feel like trying it on a real app, you can run the example project. Clone the repo, go to the `examples/Example/` folder and run:
 
 ```bash
   yarn install

android/build.gradle

@@ -1,9 +1,14 @@
 apply plugin: 'com.android.library'
+apply plugin: 'kotlin-android'
 
 def safeExtGet(prop, fallback) {
     rootProject.ext.has(prop) ? rootProject.ext.get(prop) : fallback
 }
 
+repositories {
+    mavenCentral()
+}
+
 android {
     compileSdkVersion safeExtGet("compileSdkVersion", 28)
 
@@ -14,7 +19,7 @@ android {
         versionName "1.0"
     }
 
-    // Include "lib/" as sources, unfortunetely react-native link can't handle
+    // Include "lib/" as sources, unfortunately react-native link can't handle
     // setting up alternative gradle modules. We still have "lib" defined as a
     // standalone gradle module just to be used in AndroidNativeExample
     sourceSets {
@@ -26,4 +31,6 @@ dependencies {
     //noinspection GradleDynamicVersion
     implementation 'com.facebook.react:react-native:+'
     implementation 'androidx.appcompat:appcompat:1.2.0'
+    implementation "androidx.core:core-ktx:1.6.0"
+    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:1.5.20"
 }

android/lib/src/main/java/com/swmansion/gesturehandler/BaseGestureHandlerInteractionController.kt

@@ -0,0 +1,18 @@
+package com.swmansion.gesturehandler
+
+abstract class BaseGestureHandlerInteractionController : GestureHandlerInteractionController {
+  override fun shouldWaitForHandlerFailure(
+    handler: GestureHandler<*>,
+    otherHandler: GestureHandler<*>,
+  ) = false
+
+  override fun shouldRequireHandlerToWaitForFailure(
+    handler: GestureHandler<*>,
+    otherHandler: GestureHandler<*>,
+  ) = false
+
+  override fun shouldRecognizeSimultaneously(
+    handler: GestureHandler<*>,
+    otherHandler: GestureHandler<*>,
+  ) = false
+}

android/lib/src/main/java/com/swmansion/gesturehandler/FlingGestureHandler.kt

@@ -0,0 +1,93 @@
+package com.swmansion.gesturehandler
+
+import android.os.Handler
+import android.view.MotionEvent
+
+class FlingGestureHandler : GestureHandler<FlingGestureHandler>() {
+  var numberOfPointersRequired = DEFAULT_NUMBER_OF_TOUCHES_REQUIRED
+  var direction = DEFAULT_DIRECTION
+
+  private val maxDurationMs = DEFAULT_MAX_DURATION_MS
+  private val minAcceptableDelta = DEFAULT_MIN_ACCEPTABLE_DELTA
+  private var startX = 0f
+  private var startY = 0f
+  private var handler: Handler? = null
+  private var maxNumberOfPointersSimultaneously = 0
+  private val failDelayed = Runnable { fail() }
+
+  override fun resetConfig() {
+    super.resetConfig()
+    numberOfPointersRequired = DEFAULT_NUMBER_OF_TOUCHES_REQUIRED
+    direction = DEFAULT_DIRECTION
+  }
+
+  private fun startFling(event: MotionEvent) {
+    startX = event.rawX
+    startY = event.rawY
+    begin()
+    maxNumberOfPointersSimultaneously = 1
+    if (handler == null) {
+      handler = Handler() // lazy delegate?
+    } else {
+      handler!!.removeCallbacksAndMessages(null)
+    }
+    handler!!.postDelayed(failDelayed, maxDurationMs)
+  }
+
+  private fun tryEndFling(event: MotionEvent) = if (
+    maxNumberOfPointersSimultaneously == numberOfPointersRequired &&
+    (direction and DIRECTION_RIGHT != 0 &&
+      event.rawX - startX > minAcceptableDelta ||
+      direction and DIRECTION_LEFT != 0 &&
+      startX - event.rawX > minAcceptableDelta ||
+      direction and DIRECTION_UP != 0 &&
+      startY - event.rawY > minAcceptableDelta ||
+      direction and DIRECTION_DOWN != 0 &&
+      event.rawY - startY > minAcceptableDelta)) {
+    handler!!.removeCallbacksAndMessages(null)
+    activate()
+    end()
+    true
+  } else {
+    false
+  }
+
+
+  private fun endFling(event: MotionEvent) {
+    if (!tryEndFling(event)) {
+      fail()
+    }
+  }
+
+  override fun onHandle(event: MotionEvent) {
+    val state = state
+    if (state == STATE_UNDETERMINED) {
+      startFling(event)
+    }
+    if (state == STATE_BEGAN) {
+      tryEndFling(event)
+      if (event.pointerCount > maxNumberOfPointersSimultaneously) {
+        maxNumberOfPointersSimultaneously = event.pointerCount
+      }
+      val action = event.actionMasked
+      if (action == MotionEvent.ACTION_UP) {
+        endFling(event)
+      }
+    }
+  }
+
+  override fun onCancel() {
+    handler?.removeCallbacksAndMessages(null)
+  }
+
+  override fun onReset() {
+    handler?.removeCallbacksAndMessages(null)
+  }
+
+  companion object {
+    private const val DEFAULT_MAX_DURATION_MS: Long = 800
+    private const val DEFAULT_MIN_ACCEPTABLE_DELTA: Long = 160
+    private const val DEFAULT_DIRECTION = DIRECTION_RIGHT
+    private const val DEFAULT_NUMBER_OF_TOUCHES_REQUIRED = 1
+  }
+}