Improve scroll speed and add scrollToIndex

detox/android/detox/src/full/java/com/wix/detox/espresso/DetoxAction.java

@@ -7,6 +7,7 @@
 import com.wix.detox.espresso.action.DetoxMultiTap;
 import com.wix.detox.espresso.action.RNClickAction;
 import com.wix.detox.espresso.action.ScreenshotResult;
+import com.wix.detox.espresso.action.ScrollToIndexAction;
 import com.wix.detox.espresso.action.TakeViewScreenshotAction;
 import com.wix.detox.espresso.action.GetAttributesAction;
 import com.wix.detox.action.common.MotionDir;
@@ -97,8 +98,8 @@ public void perform(UiController uiController, View view) {
     /**
      * Scrolls the View in a direction by the Density Independent Pixel amount.
      *
-     * @param direction Direction to scroll (see {@link MotionDir})
-     * @param amountInDP Density Independent Pixels
+     * @param direction           Direction to scroll (see {@link MotionDir})
+     * @param amountInDP          Density Independent Pixels
      * @param startOffsetPercentX Percentage denoting where X-swipe should start, with respect to the scrollable view.
      * @param startOffsetPercentY Percentage denoting where Y-swipe should start, with respect to the scrollable view.
      */
@@ -114,8 +115,8 @@ public static ViewAction scrollInDirection(final int direction, final double amo
      * where the scrolling-edge is reached, by throwing the {@link StaleActionException} exception (i.e.
      * so as to make this use case manageable by the user).
      *
-     * @param direction Direction to scroll (see {@link MotionDir})
-     * @param amountInDP Density Independent Pixels
+     * @param direction           Direction to scroll (see {@link MotionDir})
+     * @param amountInDP          Density Independent Pixels
      * @param startOffsetPercentX Percentage denoting where X-swipe should start, with respect to the scrollable view.
      * @param startOffsetPercentY Percentage denoting where Y-swipe should start, with respect to the scrollable view.
      */
@@ -128,9 +129,9 @@ public static ViewAction scrollInDirectionStaleAtEdge(final int direction, final
     /**
      * Swipes the View in a direction.
      *
-     * @param direction Direction to swipe (see {@link MotionDir})
-     * @param fast true if fast, false if slow
-     * @param normalizedOffset or "swipe amount" between 0.0 and 1.0, relative to the screen width/height
+     * @param direction                Direction to swipe (see {@link MotionDir})
+     * @param fast                     true if fast, false if slow
+     * @param normalizedOffset         or "swipe amount" between 0.0 and 1.0, relative to the screen width/height
      * @param normalizedStartingPointX X coordinate of swipe starting point (between 0.0 and 1.0), relative to the view width
      * @param normalizedStartingPointY Y coordinate of swipe starting point (between 0.0 and 1.0), relative to the view height
      */
@@ -143,6 +144,10 @@ public static ViewAction getAttributes() {
         return new GetAttributesAction();
     }
 
+    public static ViewAction scrollToIndex(int index) {
+        return new ScrollToIndexAction(index);
+    }
+
     public static ViewAction takeViewScreenshot() {
         return new ViewActionWithResult<String>() {
             private final TakeViewScreenshotAction action = new TakeViewScreenshotAction();

detox/android/detox/src/main/java/com/wix/detox/espresso/action/ScrollToIndexAction.kt

@@ -0,0 +1,126 @@
+package com.wix.detox.espresso.action
+
+import android.view.View
+import android.view.ViewGroup
+import androidx.test.espresso.UiController
+import androidx.test.espresso.ViewAction
+import androidx.test.espresso.matcher.ViewMatchers
+import com.facebook.react.views.scroll.ReactHorizontalScrollView
+import com.facebook.react.views.scroll.ReactScrollView
+import com.wix.detox.action.common.MOTION_DIR_DOWN
+import com.wix.detox.action.common.MOTION_DIR_LEFT
+import com.wix.detox.action.common.MOTION_DIR_RIGHT
+import com.wix.detox.action.common.MOTION_DIR_UP
+import com.wix.detox.espresso.scroll.ScrollEdgeException
+import com.wix.detox.espresso.scroll.ScrollHelper
+import org.hamcrest.Matcher
+import org.hamcrest.Matchers
+
+class ScrollToIndexAction(private val index: Int) : ViewAction {
+    override fun getConstraints(): Matcher<View> {
+        return Matchers.anyOf(
+            Matchers.allOf(
+                ViewMatchers.isAssignableFrom(
+                    View::class.java
+                ), Matchers.instanceOf(
+                    ReactScrollView::class.java
+                )
+            ),
+            Matchers.allOf(
+                ViewMatchers.isAssignableFrom(
+                    View::class.java
+                ), Matchers.instanceOf(ReactHorizontalScrollView::class.java)
+            )
+        )
+    }
+
+    override fun getDescription(): String {
+        return "scrollToIndex"
+    }
+
+    override fun perform(uiController: UiController?, view: View?) {
+        if (index < 0) return
+
+        val offsetPercent = 0.4f
+        val reactScrollView = view as ViewGroup
+        val internalContainer = reactScrollView.getChildAt(0) as ViewGroup
+        val childCount = internalContainer.childCount
+        if (index >= childCount) return
+
+        val isHorizontalScrollView = getIsHorizontalScrollView(reactScrollView)
+        val targetPosition = getTargetPosition(isHorizontalScrollView, internalContainer, index)
+        var currentPosition = getCurrentPosition(isHorizontalScrollView, reactScrollView)
+        val jumpSize = getTargetDimension(isHorizontalScrollView, internalContainer, index)
+        val scrollDirection =
+            getScrollDirection(isHorizontalScrollView, currentPosition, targetPosition)
+
+        // either we'll find the target view or we'll hit the edge of the scrollview
+
+        // either we'll find the target view or we'll hit the edge of the scrollview
+        while (true) {
+            if (Math.abs(currentPosition - targetPosition) < jumpSize) {
+                // we found the target view
+                return
+            }
+            currentPosition = try {
+                ScrollHelper.perform(
+                    uiController,
+                    view,
+                    scrollDirection,
+                    jumpSize.toDouble(),
+                    offsetPercent,
+                    offsetPercent
+                )
+                getCurrentPosition(isHorizontalScrollView, reactScrollView)
+            } catch (e: ScrollEdgeException) {
+                // we hit the edge
+                return
+            }
+        }
+    }
+
+}
+
+private fun getScrollDirection(
+    isHorizontalScrollView: Boolean,
+    currentPosition: Int,
+    targetPosition: Int
+): Int {
+    return if (isHorizontalScrollView) {
+        if (currentPosition < targetPosition) MOTION_DIR_RIGHT else MOTION_DIR_LEFT
+    } else {
+        if (currentPosition < targetPosition) MOTION_DIR_DOWN else MOTION_DIR_UP
+    }
+}
+
+private fun getIsHorizontalScrollView(scrollView: ViewGroup): Boolean {
+    return scrollView.canScrollHorizontally(1) || scrollView.canScrollHorizontally(-1)
+}
+
+private fun getCurrentPosition(isHorizontalScrollView: Boolean, scrollView: ViewGroup): Int {
+    return if (isHorizontalScrollView) scrollView.scrollX else scrollView.scrollY
+}
+
+private fun getTargetDimension(
+    isHorizontalScrollView: Boolean,
+    internalContainer: ViewGroup,
+    index: Int
+): Int {
+    return if (isHorizontalScrollView) internalContainer.getChildAt(index).measuredWidth else internalContainer.getChildAt(
+        index
+    ).measuredHeight
+}
+
+private fun getTargetPosition(
+    isHorizontalScrollView: Boolean,
+    internalContainer: ViewGroup,
+    index: Int
+): Int {
+    var necessaryTarget = 0
+    for (childIndex in 0 until index) {
+        necessaryTarget += if (isHorizontalScrollView) internalContainer.getChildAt(childIndex).measuredWidth else internalContainer.getChildAt(
+            childIndex
+        ).measuredHeight
+    }
+    return necessaryTarget
+}

detox/android/detox/src/main/java/com/wix/detox/espresso/scroll/FlinglessSwiper.kt

@@ -92,7 +92,7 @@ class FlinglessSwiper @JvmOverloads constructor(
 
     companion object {
 //        private const val LOG_TAG = "DetoxBatchedSwiper"
-        private const val VELOCITY_SAFETY_RATIO = .85f
+        private const val VELOCITY_SAFETY_RATIO = .99f
         private const val FAST_EVENTS_RATIO = .75f
     }
 }

detox/android/detox/src/testFull/java/com/wix/detox/espresso/scroll/FlinglessSwiperSpec.kt

@@ -66,10 +66,10 @@ object FlinglessSwiperSpec: Spek({
         }
 
         describe("move") {
-            val SWIPER_VELOCITY = 85f
+            val SWIPER_VELOCITY = 99f
 
             beforeEachTest {
-                whenever(viewConfig.scaledMinimumFlingVelocity).doReturn(100) // i.e. we expect the swiper to apply a safety margin of 85%, hence actual velocity = 85 px/sec
+                whenever(viewConfig.scaledMinimumFlingVelocity).doReturn(100) // i.e. we expect the swiper to apply a safety margin of 99%, hence actual velocity = 99 px/sec
             }
 
             it("should obtain a move event") {
@@ -121,7 +121,7 @@ object FlinglessSwiperSpec: Spek({
 
                     with(uut()) {
                         startAt(0f, 0f)
-                        moveTo(0f, 42.5f)
+                        moveTo(0f, SWIPER_VELOCITY/2)
                     }
 
                     verify(motionEvents).obtainMoveEvent(any(), eq(expectedEventTime), any(), any())
@@ -162,7 +162,7 @@ object FlinglessSwiperSpec: Spek({
                     }
 
                     verify(motionEvents, times(3)).obtainMoveEvent(any(), eq(swipeStartTime + 10L), any(), any())
-                    verify(motionEvents, times(1)).obtainMoveEvent(any(), eq(swipeStartTime + 1000L), any(), any())
+                    verify(motionEvents, times(1)).obtainMoveEvent(any(), eq(swipeStartTime + 858), any(), any())
                 }
             }
         }
@@ -190,9 +190,9 @@ object FlinglessSwiperSpec: Spek({
 
                 with(uut()) {
                     startAt(666f, 999f)
-                    finishAt(666f + 85f, 999f + 85f)
+                    finishAt(666f + 99f, 999f + 99f)
                 }
-                verify(motionEvents).obtainUpEvent(downEvent, expectedEventTime, 666f + 85f, 999f + 85f)
+                verify(motionEvents).obtainUpEvent(downEvent, expectedEventTime, 666f + 99f, 999f + 99f)
             }
 
             it("should finish by flushing all events to ui controller") {

detox/index.d.ts

@@ -1032,6 +1032,14 @@ declare global {
               startPositionY?: number,
             ): Promise<void>;
 
+            /**
+             * Scroll to index.
+             * @example await element(by.id('scrollView')).scrollToIndex(10);
+             */
+            scrollToIndex(
+              index: Number
+            ): Promise<void>;
+
             /**
              * Scroll to edge.
              * @example await element(by.id('scrollView')).scrollTo('bottom');

detox/src/android/AndroidExpect.test.js

@@ -189,6 +189,7 @@ describe('AndroidExpect', () => {
         await e.element(e.by.id('ScrollView161')).scrollTo('top');
         await e.element(e.by.id('ScrollView161')).scrollTo('left');
         await e.element(e.by.id('ScrollView161')).scrollTo('right');
+        await e.element(e.by.id('ScrollView161')).scrollToIndex(0);
       });
 
       it('should not scroll given bad args', async () => {

detox/src/android/actions/native.js

@@ -117,6 +117,13 @@ class GetAttributes extends Action {
   }
 }
 
+class ScrollToIndex extends Action {
+  constructor(index) {
+    super();
+    this._call = invoke.callDirectly(DetoxActionApi.scrollToIndex(index));
+  }
+}
+
 class TakeElementScreenshot extends Action {
   constructor() {
     super();
@@ -140,4 +147,5 @@ module.exports = {
   ScrollEdgeAction,
   SwipeAction,
   TakeElementScreenshot,
+  ScrollToIndex,
 };

detox/src/android/core/NativeElement.js

@@ -79,6 +79,11 @@ class NativeElement {
     return await new ActionInteraction(this._invocationManager, this, new actions.ScrollEdgeAction(edge)).execute();
   }
 
+  async scrollToIndex(index) {
+    this._selectElementWithMatcher(this._originalMatcher._extendToDescendantScrollViews());
+    return await new ActionInteraction(this._invocationManager, this, new actions.ScrollToIndex(index)).execute();
+  }
+
   /**
    * @param {'up' | 'right' | 'down' | 'left'} direction
    * @param {'slow' | 'fast'} [speed]

detox/src/android/espressoapi/DetoxAction.js

@@ -179,6 +179,21 @@ class DetoxAction {
     };
   }
 
+  static scrollToIndex(index) {
+    if (typeof index !== "number") throw new Error("index should be a number, but got " + (index + (" (" + (typeof index + ")"))));
+    return {
+      target: {
+        type: "Class",
+        value: "com.wix.detox.espresso.DetoxAction"
+      },
+      method: "scrollToIndex",
+      args: [{
+        type: "Integer",
+        value: index
+      }]
+    };
+  }
+
   static takeViewScreenshot() {
     return {
       target: {

detox/test/e2e/03.actions-scroll.test.js

@@ -71,4 +71,36 @@ describe('Actions - Scroll', () => {
     await element(by.id('toggleScrollOverlays')).tap();
     await expect(element(by.text('HText6'))).not.toBeVisible();
   });
+
+  it(':android: should be able to scrollToIndex on horizontal scrollviews', async () => {
+    // should ignore out of bounds children
+    await element(by.id('ScrollViewH')).scrollToIndex(3000);
+    await element(by.id('ScrollViewH')).scrollToIndex(-1);
+    await expect(element(by.text('HText1'))).toBeVisible();
+
+    await expect(element(by.text('HText8'))).not.toBeVisible();
+    await element(by.id('ScrollViewH')).scrollToIndex(7);
+    await expect(element(by.text('HText8'))).toBeVisible();
+    await expect(element(by.text('HText1'))).not.toBeVisible();
+
+    await element(by.id('ScrollViewH')).scrollToIndex(0);
+    await expect(element(by.text('HText1'))).toBeVisible();
+    await expect(element(by.text('HText8'))).not.toBeVisible();
+  });
+
+  it(':android: should be able to scrollToIndex on vertical scrollviews', async () => {
+    // should ignore out of bounds children
+    await element(by.id('ScrollView161')).scrollToIndex(3000);
+    await element(by.id('ScrollView161')).scrollToIndex(-1);
+    await expect(element(by.text('Text1'))).toBeVisible();
+
+    await element(by.id('ScrollView161')).scrollToIndex(11);
+    await expect(element(by.text('Text12'))).toBeVisible();
+
+    await element(by.id('ScrollView161')).scrollToIndex(0);
+    await expect(element(by.text('Text1'))).toBeVisible();
+
+    await element(by.id('ScrollView161')).scrollToIndex(7);
+    await expect(element(by.text('Text8'))).toBeVisible();
+  });
 });

docs/APIRef.ActionsOnElement.md

@@ -12,6 +12,7 @@ Use [expectations](APIRef.Expect.md) to verify element states.
 - [`.longPressAndDrag()`](#longpressanddragduration-normalizedpositionx-normalizedpositiony-targetelement-normalizedtargetpositionx-normalizedtargetpositiony-speed-holdduration--ios-only) **iOS only**
 - [`.swipe()`](#swipedirection-speed-normalizedoffset-normalizedstartingpointx-normalizedstartingpointy)
 - [`.pinch()`](#pinchscale-speed-angle--ios-only) **iOS only**
+- [`.scrollToIndex()`](#scrolltoindexindex--android-only) **Android only**  
 - [`.scroll()`](#scrolloffset-direction-startpositionx-startpositiony)
   - [`whileElement()`](#whileelementelement)
 - [`.scrollTo()`](#scrolltoedge)
@@ -106,6 +107,15 @@ await element(by.id('PinchableScrollView')).pinch(1.1); //Zooms in a little bit
 await element(by.id('PinchableScrollView')).pinch(2.0); //Zooms in a lot
 await element(by.id('PinchableScrollView')).pinch(0.001); //Zooms out a lot
 ```
+### `scrollToIndex(index)`  Android only
+
+Scrolls until it reaches the element with the provided index. This works for ReactScrollView and ReactHorizontalScrollView.
+
+`index`—the index of the target element <br/>
+
+```js
+await element(by.id('scrollView')).scrollToIndex(0);
+```
 ### `scroll(offset, direction, startPositionX, startPositionY)`
 
 Simulates a scroll on the element with the provided options.
@@ -318,4 +328,4 @@ Simulates a pinch on the element with the provided options.
 
 ```js
 await element(by.id('PinchableScrollView')).pinchWithAngle('outward', 'slow', 0);
-```
+```