Easter egg for touchpad gestures tutorial (ff31d335) · Commits · e / os / android_frameworks_base

packages/SystemUI/multivalentTests/src/com/android/systemui/touchpad/tutorial/ui/gesture/EasterEggGestureTest.kt

0 → 100644

+156 −0

Original line number	Diff line number	Diff line
		/*
		* Copyright (C) 2024 The Android Open Source Project
		*
		* 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 com.android.systemui.touchpad.tutorial.ui.gesture

		import android.view.MotionEvent
		import androidx.test.ext.junit.runners.AndroidJUnit4
		import androidx.test.filters.SmallTest
		import com.android.systemui.SysuiTestCase
		import com.android.systemui.touchpad.tutorial.ui.gesture.MultiFingerGesture.Companion.SWIPE_DISTANCE
		import com.google.common.truth.Truth.assertThat
		import kotlin.math.cos
		import kotlin.math.sin
		import org.junit.Test
		import org.junit.runner.RunWith

		@SmallTest
		@RunWith(AndroidJUnit4::class)
		class EasterEggGestureTest : SysuiTestCase() {

		private data class Point(val x: Float, val y: Float)

		private var triggered = false
		private val handler =
		TouchpadGestureHandler(
		BackGestureMonitor(
		gestureDistanceThresholdPx = SWIPE_DISTANCE.toInt(),
		gestureStateChangedCallback = {},
		),
		EasterEggGestureMonitor(callback = { triggered = true }),
		)

		@Test
		fun easterEggTriggeredAfterThreeCircles() {
		assertStateAfterTwoFingerGesture(
		gesturePath = generateCircularGesturePoints(circlesCount = 3),
		wasTriggered = true,
		)
		}

		@Test
		fun easterEggTriggeredAfterThreeImperfectCircles() {
		assertStateAfterTwoFingerGesture(
		gesturePath =
		generateCircularGesturePoints(circlesCount = 3, radiusNoiseFraction = 0.2),
		wasTriggered = true,
		)
		}

		@Test
		fun easterEggTriggeredAfterFiveCircles() {
		assertStateAfterTwoFingerGesture(
		gesturePath = generateCircularGesturePoints(circlesCount = 5),
		wasTriggered = true,
		)
		}

		@Test
		fun easterEggNotTriggeredAfterTwoCircles() {
		assertStateAfterTwoFingerGesture(
		gesturePath = generateCircularGesturePoints(circlesCount = 2),
		wasTriggered = false,
		)
		}

		@Test
		fun easterEggNotTriggeredAfterVariousSwipes() {
		val allSwipeGestures =
		listOf(
		// two finger gestures
		TwoFingerGesture.swipeUp(),
		TwoFingerGesture.swipeDown(),
		TwoFingerGesture.swipeLeft(),
		TwoFingerGesture.swipeRight(),
		// three finger gestures
		ThreeFingerGesture.swipeUp(),
		ThreeFingerGesture.swipeDown(),
		ThreeFingerGesture.swipeLeft(),
		ThreeFingerGesture.swipeRight(),
		// four finger gestures
		FourFingerGesture.swipeUp(),
		FourFingerGesture.swipeDown(),
		FourFingerGesture.swipeLeft(),
		FourFingerGesture.swipeRight(),
		)
		allSwipeGestures.forEach { gesture ->
		assertStateAfterEvents(events = gesture, wasTriggered = false)
		}
		}

		private fun assertStateAfterEvents(events: List<MotionEvent>, wasTriggered: Boolean) {
		events.forEach { handler.onMotionEvent(it) }
		assertThat(triggered).isEqualTo(wasTriggered)
		}

		private fun assertStateAfterTwoFingerGesture(gesturePath: List<Point>, wasTriggered: Boolean) {
		val events = TwoFingerGesture.createEvents { gesturePath.forEach { (x, y) -> move(x, y) } }
		assertStateAfterEvents(events = events, wasTriggered = wasTriggered)
		}

		/**
		* Generates list of points that would make up clockwise circular motion with given [radius].
		* [circlesCount] determines how many full circles gesture should perform. [radiusNoiseFraction]
		* can introduce noise to mimic real-world gesture which is not perfect - shape will be still
		* circular but radius at any given point can be deviate from given radius by
		* [radiusNoiseFraction].
		*/
		private fun generateCircularGesturePoints(
		circlesCount: Int,
		radiusNoiseFraction: Double? = null,
		radius: Float = 100f,
		): List<Point> {
		val pointsPerCircle = 50
		val angleStep = 360 / pointsPerCircle
		val angleBuffer = 20 // buffer to make sure we're doing a bit more than 360 degree
		val totalAngle = circlesCount * (360 + angleBuffer)
		// Because all gestures in tests should start at (DEFAULT_X, DEFAULT_Y) we need to shift
		// circle center x coordinate by radius
		val centerX = -radius
		val centerY = 0f

		val events = mutableListOf<Point>()
		val randomNoise: (Double) -> Double =
		if (radiusNoiseFraction == null) {
		{ 0.0 }
		} else {
		{ radianAngle -> sin(radianAngle * 2) * radiusNoiseFraction }
		}

		var currentAngle = 0f
		// as cos(0) == 1 and sin(0) == 0 we start gesture at position of (radius, 0) and go
		// clockwise - first Y increases and X decreases
		while (currentAngle < totalAngle) {
		val radianAngle = Math.toRadians(currentAngle.toDouble())
		val radiusWithNoise = radius * (1 + randomNoise(radianAngle).toFloat())
		val x = centerX + radiusWithNoise * cos(radianAngle).toFloat()
		val y = centerY + radiusWithNoise * sin(radianAngle).toFloat()
		events.add(Point(x, y))
		currentAngle += angleStep
		}
		return events
		}
		}

packages/SystemUI/multivalentTests/src/com/android/systemui/touchpad/tutorial/ui/gesture/TouchpadGestureHandlerTest.kt

+3 −2

Original line number	Diff line number	Diff line
		@@ -41,8 +41,9 @@ class TouchpadGestureHandlerTest : SysuiTestCase() {
		TouchpadGestureHandler(
		BackGestureMonitor(
		gestureDistanceThresholdPx = SWIPE_DISTANCE.toInt(),
		gestureStateChangedCallback = { gestureState = it }
		)
		gestureStateChangedCallback = { gestureState = it },
		),
		EasterEggGestureMonitor {},
		)

		@Test

packages/SystemUI/src/com/android/systemui/touchpad/tutorial/ui/composable/GestureTutorialScreen.kt

+34 −7

Original line number	Diff line number	Diff line
		@@ -18,20 +18,25 @@ package com.android.systemui.touchpad.tutorial.ui.composable

		import android.content.res.Resources
		import androidx.activity.compose.BackHandler
		import androidx.compose.animation.core.Animatable
		import androidx.compose.animation.core.tween
		import androidx.compose.foundation.layout.Box
		import androidx.compose.foundation.layout.BoxScope
		import androidx.compose.foundation.layout.fillMaxSize
		import androidx.compose.runtime.Composable
		import androidx.compose.runtime.LaunchedEffect
		import androidx.compose.runtime.getValue
		import androidx.compose.runtime.mutableStateOf
		import androidx.compose.runtime.remember
		import androidx.compose.runtime.setValue
		import androidx.compose.ui.Modifier
		import androidx.compose.ui.graphics.graphicsLayer
		import androidx.compose.ui.input.pointer.pointerInteropFilter
		import androidx.compose.ui.platform.LocalContext
		import com.android.systemui.inputdevice.tutorial.ui.composable.ActionTutorialContent
		import com.android.systemui.inputdevice.tutorial.ui.composable.TutorialActionState
		import com.android.systemui.inputdevice.tutorial.ui.composable.TutorialScreenConfig
		import com.android.systemui.touchpad.tutorial.ui.gesture.EasterEggGestureMonitor
		import com.android.systemui.touchpad.tutorial.ui.gesture.GestureState
		import com.android.systemui.touchpad.tutorial.ui.gesture.GestureState.FINISHED
		import com.android.systemui.touchpad.tutorial.ui.gesture.GestureState.IN_PROGRESS
		@@ -44,7 +49,7 @@ interface GestureMonitorProvider {
		@Composable
		fun rememberGestureMonitor(
		resources: Resources,
		gestureStateChangedCallback: (GestureState) -> Unit
		gestureStateChangedCallback: (GestureState) -> Unit,
		): TouchpadGestureMonitor
		}

		@@ -57,7 +62,7 @@ class DistanceBasedGestureMonitorProvider(
		@Composable
		override fun rememberGestureMonitor(
		resources: Resources,
		gestureStateChangedCallback: (GestureState) -> Unit
		gestureStateChangedCallback: (GestureState) -> Unit,
		): TouchpadGestureMonitor {
		val distanceThresholdPx =
		resources.getDimensionPixelSize(
		@@ -86,17 +91,25 @@ fun GestureTutorialScreen(
		) {
		BackHandler(onBack = onBack)
		var gestureState by remember { mutableStateOf(NOT_STARTED) }
		var easterEggTriggered by remember { mutableStateOf(false) }
		val gestureMonitor =
		gestureMonitorProvider.rememberGestureMonitor(
		resources = LocalContext.current.resources,
		gestureStateChangedCallback = { gestureState = it }
		gestureStateChangedCallback = { gestureState = it },
		)
		val gestureHandler = remember(gestureMonitor) { TouchpadGestureHandler(gestureMonitor) }
		TouchpadGesturesHandlingBox(gestureHandler, gestureState) {
		val easterEggMonitor = EasterEggGestureMonitor { easterEggTriggered = true }
		val gestureHandler =
		remember(gestureMonitor) { TouchpadGestureHandler(gestureMonitor, easterEggMonitor) }
		TouchpadGesturesHandlingBox(
		gestureHandler,
		gestureState,
		easterEggTriggered,
		resetEasterEggFlag = { easterEggTriggered = false },
		) {
		ActionTutorialContent(
		gestureState.toTutorialActionState(),
		onDoneButtonClicked,
		screenConfig
		screenConfig,
		)
		}
		}
		@@ -105,9 +118,22 @@ fun GestureTutorialScreen(
		private fun TouchpadGesturesHandlingBox(
		gestureHandler: TouchpadGestureHandler,
		gestureState: GestureState,
		easterEggTriggered: Boolean,
		resetEasterEggFlag: () -> Unit,
		modifier: Modifier = Modifier,
		content: @Composable BoxScope.() -> Unit
		content: @Composable BoxScope.() -> Unit,
		) {
		val rotationAnimation = remember { Animatable(0f) }
		LaunchedEffect(easterEggTriggered) {
		if (easterEggTriggered \|\| rotationAnimation.isRunning) {
		rotationAnimation.snapTo(0f)
		rotationAnimation.animateTo(
		targetValue = 360f,
		animationSpec = tween(durationMillis = 2000),
		)
		resetEasterEggFlag()
		}
		}
		Box(
		modifier =
		modifier
		@@ -124,6 +150,7 @@ private fun TouchpadGesturesHandlingBox(
		}
		}
		)
		.graphicsLayer { rotationZ = rotationAnimation.value }
		) {
		content()
		}

packages/SystemUI/src/com/android/systemui/touchpad/tutorial/ui/gesture/EasterEggGestureMonitor.kt

0 → 100644

+151 −0

Original line number	Diff line number	Diff line
		/*
		* Copyright (C) 2024 The Android Open Source Project
		*
		* 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 com.android.systemui.touchpad.tutorial.ui.gesture

		import android.view.MotionEvent
		import com.android.systemui.touchpad.tutorial.ui.gesture.EasterEggGestureMonitor.Companion.CIRCLES_COUNT_THRESHOLD
		import kotlin.math.abs
		import kotlin.math.atan2
		import kotlin.math.pow
		import kotlin.math.sqrt

		/**
		* Monitor recognizing easter egg gesture, that is at least [CIRCLES_COUNT_THRESHOLD] circles
		* clockwise within one gesture. It tries to be on the safer side of not triggering gesture if we're
		* not sure if full circle was done.
		*/
		class EasterEggGestureMonitor(private val callback: () -> Unit) {

		private var last: Point = Point(0f, 0f)
		private var cumulativeAngle: Float = 0f
		private var lastAngle: Float? = null
		private var circleCount: Int = 0

		private class Point(val x: Float, val y: Float)

		private val points = mutableListOf<Point>()

		fun processTouchpadEvent(event: MotionEvent) {
		when (event.action) {
		MotionEvent.ACTION_DOWN -> {
		reset()
		last = Point(event.x, event.y)
		points.add(Point(event.x, event.y))
		}
		MotionEvent.ACTION_MOVE -> {
		val current = Point(event.x, event.y)
		points.add(current)

		if (distanceBetween(last, current) > MIN_MOTION_EVENT_DISTANCE_PX) {
		val currentAngle = calculateAngle(last, current)
		if (lastAngle == null) {
		// we can't start calculating angle changes before having calculated first
		// angle which serves as a reference point
		lastAngle = currentAngle
		} else {
		val deltaAngle = currentAngle - lastAngle!!

		cumulativeAngle += normalizeAngleDelta(deltaAngle)
		lastAngle = currentAngle
		last = current

		val fullCircleCompleted = cumulativeAngle >= 2 * Math.PI
		if (fullCircleCompleted) {
		cumulativeAngle = 0f
		circleCount += 1
		}
		}
		}
		}
		MotionEvent.ACTION_UP -> {
		// without checking if gesture is circular we can have gesture doing arches back and
		// forth that finally reaches full circle angle
		if (circleCount >= CIRCLES_COUNT_THRESHOLD && wasGestureCircular(points)) {
		callback()
		}
		reset()
		}
		MotionEvent.ACTION_CANCEL -> {
		reset()
		}
		}
		}

		private fun reset() {
		cumulativeAngle = 0f
		lastAngle = null
		circleCount = 0
		points.clear()
		}

		private fun normalizeAngleDelta(deltaAngle: Float): Float {
		// Normalize the deltaAngle to [-PI, PI] range
		val normalizedDelta =
		if (deltaAngle > Math.PI) {
		deltaAngle - (2 * Math.PI).toFloat()
		} else if (deltaAngle < -Math.PI) {
		deltaAngle + (2 * Math.PI).toFloat()
		} else {
		deltaAngle
		}
		return normalizedDelta
		}

		private fun wasGestureCircular(points: List<Point>): Boolean {
		val center =
		Point(
		x = points.map { it.x }.average().toFloat(),
		y = points.map { it.y }.average().toFloat(),
		)
		val radius = points.map { distanceBetween(it, center) }.average().toFloat()
		for (point in points) {
		val distance = distanceBetween(point, center)
		if (abs(distance - radius) > RADIUS_DEVIATION_TOLERANCE * radius) {
		return false
		}
		}
		return true
		}

		private fun distanceBetween(point: Point, center: Point) =
		sqrt((point.x - center.x).toDouble().pow(2.0) + (point.y - center.y).toDouble().pow(2.0))

		private fun calculateAngle(point1: Point, point2: Point): Float {
		return atan2(point2.y - point1.y, point2.x - point1.x)
		}

		companion object {
		/**
		* How much we allow any one point to deviate from average radius. In other words it's a
		* modifier of how difficult is to trigger the gesture. The smaller value the harder it is
		* to trigger. 0.6f seems quite high but:
		* 1. this is just extra check after circles were verified with movement angle
		* 2. it's because of how touchpad events work - they're approximating movement, so doing
		* smooth circle is ~impossible. Rounded corners square is probably the best thing that
		* user can do
		*/
		private const val RADIUS_DEVIATION_TOLERANCE: Float = 0.7f
		private const val CIRCLES_COUNT_THRESHOLD = 3

		/**
		* Min distance required between motion events to have angular difference calculated. This
		* value is a tradeoff between: minimizing the noise and delaying circle recognition (high
		* value) versus performing calculations very/too often (low value).
		*/
		private const val MIN_MOTION_EVENT_DISTANCE_PX = 10
		}
		}

packages/SystemUI/src/com/android/systemui/touchpad/tutorial/ui/gesture/TouchpadGestureHandler.kt

+6 −1

Original line number	Diff line number	Diff line
		@@ -25,6 +25,7 @@ import android.view.MotionEvent
		*/
		class TouchpadGestureHandler(
		private val gestureMonitor: TouchpadGestureMonitor,
		private val easterEggGestureMonitor: EasterEggGestureMonitor,
		) {

		fun onMotionEvent(event: MotionEvent): Boolean {
		@@ -36,7 +37,11 @@ class TouchpadGestureHandler(
		event.actionMasked == MotionEvent.ACTION_DOWN &&
		event.isButtonPressed(MotionEvent.BUTTON_PRIMARY)
		return if (isFromTouchpad && !buttonClick) {
		if (isTwoFingerSwipe(event)) {
		easterEggGestureMonitor.processTouchpadEvent(event)
		} else {
		gestureMonitor.processTouchpadEvent(event)
		}
		true
		} else {
		false