DO NOT MERGE New back affordance small polish nits am: 92e8dafec8

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/21483766

Change-Id: I0a72d025dc0e18c2eefe2f5e5a53a3197f3b4630
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>

3 files changed, 69 insertions, 61 deletions

diff --git a/packages/SystemUI/src/com/android/systemui/navigationbar/gestural/BackPanel.kt b/packages/SystemUI/src/com/android/systemui/navigationbar/gestural/BackPanel.kt
index f335733b430c..c76cfbdfe48c 100644
--- a/packages/SystemUI/src/com/android/systemui/navigationbar/gestural/BackPanel.kt
+++ b/packages/SystemUI/src/com/android/systemui/navigationbar/gestural/BackPanel.kt
@@ -2,19 +2,15 @@ package com.android.systemui.navigationbar.gestural
 
 import android.content.Context
 import android.content.res.Configuration
-import android.content.res.TypedArray
 import android.graphics.Canvas
 import android.graphics.Paint
 import android.graphics.Path
 import android.graphics.RectF
 import android.util.MathUtils.min
-import android.util.TypedValue
 import android.view.View
-import androidx.appcompat.view.ContextThemeWrapper
 import androidx.dynamicanimation.animation.FloatPropertyCompat
 import androidx.dynamicanimation.animation.SpringAnimation
 import androidx.dynamicanimation.animation.SpringForce
-import com.android.internal.R.style.Theme_DeviceDefault
 import com.android.internal.util.LatencyTracker
 import com.android.settingslib.Utils
 import com.android.systemui.navigationbar.gestural.BackPanelController.DelayedOnAnimationEndListener
@@ -159,26 +155,21 @@ class BackPanel(
         val isDeviceInNightTheme = resources.configuration.uiMode and
                 Configuration.UI_MODE_NIGHT_MASK == Configuration.UI_MODE_NIGHT_YES
 
-        val colorControlActivated = ContextThemeWrapper(context, Theme_DeviceDefault)
-                .run {
-                    val typedValue = TypedValue()
-                    val a: TypedArray = obtainStyledAttributes(typedValue.data,
-                            intArrayOf(android.R.attr.colorControlActivated))
-                    val color = a.getColor(0, 0)
-                    a.recycle()
-                    color
-                }
-
-        val colorPrimary =
-                Utils.getColorAttrDefaultColor(context, com.android.internal.R.attr.colorPrimary)
-
-        arrowPaint.color = Utils.getColorAccentDefaultColor(context)
+        arrowPaint.color = Utils.getColorAttrDefaultColor(context,
+            if (isDeviceInNightTheme) {
+                com.android.internal.R.attr.colorAccentPrimary
+            } else {
+                com.android.internal.R.attr.textColorPrimary
+            }
+        )
 
-        arrowBackgroundPaint.color = if (isDeviceInNightTheme) {
-            colorPrimary
-        } else {
-            colorControlActivated
-        }
+        arrowBackgroundPaint.color = Utils.getColorAttrDefaultColor(context,
+            if (isDeviceInNightTheme) {
+                com.android.internal.R.attr.colorSurface
+            } else {
+                com.android.internal.R.attr.colorAccentSecondary
+            }
+        )
     }
 
     inner class AnimatedFloat(
@@ -414,9 +405,9 @@ class BackPanel(
     ) {
         horizontalTranslation.updateRestingPosition(restingParams.horizontalTranslation)
         scale.updateRestingPosition(restingParams.scale)
-        arrowAlpha.updateRestingPosition(restingParams.arrowDimens.alpha)
         backgroundAlpha.updateRestingPosition(restingParams.backgroundDimens.alpha)
 
+        arrowAlpha.updateRestingPosition(restingParams.arrowDimens.alpha, animate)
         arrowLength.updateRestingPosition(restingParams.arrowDimens.length, animate)
         arrowHeight.updateRestingPosition(restingParams.arrowDimens.height, animate)
         scalePivotX.updateRestingPosition(restingParams.backgroundDimens.width, animate)
diff --git a/packages/SystemUI/src/com/android/systemui/navigationbar/gestural/BackPanelController.kt b/packages/SystemUI/src/com/android/systemui/navigationbar/gestural/BackPanelController.kt
index 367d12547b9f..ce1c8daf1d45 100644
--- a/packages/SystemUI/src/com/android/systemui/navigationbar/gestural/BackPanelController.kt
+++ b/packages/SystemUI/src/com/android/systemui/navigationbar/gestural/BackPanelController.kt
@@ -55,12 +55,12 @@ private const val PX_PER_MS = 1
 
 internal const val MIN_DURATION_ACTIVE_ANIMATION = 300L
 private const val MIN_DURATION_CANCELLED_ANIMATION = 200L
-private const val MIN_DURATION_COMMITTED_ANIMATION = 200L
+private const val MIN_DURATION_COMMITTED_ANIMATION = 120L
 private const val MIN_DURATION_INACTIVE_BEFORE_FLUNG_ANIMATION = 50L
 private const val MIN_DURATION_CONSIDERED_AS_FLING = 100L
 
 private const val FAILSAFE_DELAY_MS = 350L
-private const val POP_ON_FLING_DELAY = 160L
+private const val POP_ON_FLING_DELAY = 140L
 
 internal val VIBRATE_ACTIVATED_EFFECT =
         VibrationEffect.createPredefined(VibrationEffect.EFFECT_CLICK)
@@ -148,8 +148,6 @@ class BackPanelController internal constructor(
     private var gestureSinceActionDown = 0L
     private var gestureEntryTime = 0L
     private var gestureActiveTime = 0L
-    private var gestureInactiveOrEntryTime = 0L
-    private var gestureArrowStrokeVisibleTime = 0L
 
     private val elapsedTimeSinceActionDown
         get() = SystemClock.uptimeMillis() - gestureSinceActionDown
@@ -441,34 +439,44 @@ class BackPanelController internal constructor(
 
         updateArrowStateOnMove(yTranslation, xTranslation)
 
-        when (currentState) {
-            GestureState.ACTIVE -> {
-                stretchActiveBackIndicator(fullScreenProgress(xTranslation))
-            }
-            GestureState.ENTRY -> {
-                val progress = staticThresholdProgress(xTranslation)
-                stretchEntryBackIndicator(progress)
-
-                params.arrowStrokeAlphaSpring.get(progress).takeIf { it.isNewState }?.let {
-                    mView.popArrowAlpha(0f, it.value)
-                }
-            }
-            GestureState.INACTIVE -> {
-                val progress = reactivationThresholdProgress(totalTouchDelta)
-                stretchInactiveBackIndicator(progress)
+        val gestureProgress = when (currentState) {
+            GestureState.ACTIVE -> fullScreenProgress(xTranslation)
+            GestureState.ENTRY -> staticThresholdProgress(xTranslation)
+            GestureState.INACTIVE -> reactivationThresholdProgress(totalTouchDelta)
+            else -> null
+        }
 
-                params.arrowStrokeAlphaSpring.get(progress).takeIf { it.isNewState }?.let {
-                    gestureArrowStrokeVisibleTime = SystemClock.uptimeMillis()
-                    mView.popArrowAlpha(0f, it.value)
-                }
+        gestureProgress?.let {
+            when (currentState) {
+                GestureState.ACTIVE -> stretchActiveBackIndicator(gestureProgress)
+                GestureState.ENTRY -> stretchEntryBackIndicator(gestureProgress)
+                GestureState.INACTIVE -> stretchInactiveBackIndicator(gestureProgress)
+                else -> {}
             }
-            else -> {}
         }
 
-        // set y translation
+        setArrowStrokeAlpha(gestureProgress)
         setVerticalTranslation(yOffset)
     }
 
+    private fun setArrowStrokeAlpha(gestureProgress: Float?) {
+        val strokeAlphaProgress = when (currentState) {
+            GestureState.ENTRY -> gestureProgress
+            GestureState.INACTIVE -> gestureProgress
+            GestureState.ACTIVE,
+            GestureState.FLUNG,
+            GestureState.COMMITTED -> 1f
+            GestureState.CANCELLED,
+            GestureState.GONE -> 0f
+        }
+
+        strokeAlphaProgress?.let { progress ->
+            params.arrowStrokeAlphaSpring.get(progress).takeIf { it.isNewState }?.let {
+                mView.popArrowAlpha(0f, it.value)
+            }
+        }
+    }
+
     private fun setVerticalTranslation(yOffset: Float) {
         val yTranslation = abs(yOffset)
         val maxYOffset = (mView.height - params.entryIndicator.backgroundDimens.height) / 2f
@@ -599,7 +607,7 @@ class BackPanelController internal constructor(
 
     private fun isFlungAwayFromEdge(endX: Float, startX: Float = touchDeltaStartX): Boolean {
         val minDistanceConsideredForFling = ViewConfiguration.get(context).scaledTouchSlop
-        val flingDistance = abs(endX - startX)
+        val flingDistance = if (mView.isLeftPanel) endX - startX else startX - endX
         val isPastFlingVelocity = isDragAwayFromEdge(
                 velocityPxPerSecThreshold =
                 ViewConfiguration.get(context).scaledMinimumFlingVelocity)
@@ -764,7 +772,7 @@ class BackPanelController internal constructor(
                             GestureState.ENTRY,
                             GestureState.INACTIVE -> params.entryIndicator.arrowDimens
                             GestureState.ACTIVE -> params.activeIndicator.arrowDimens
-                            GestureState.FLUNG,
+                            GestureState.FLUNG -> params.flungIndicator.arrowDimens
                             GestureState.COMMITTED -> params.committedIndicator.arrowDimens
                             GestureState.CANCELLED -> params.cancelledIndicator.arrowDimens
                         },
@@ -825,7 +833,6 @@ class BackPanelController internal constructor(
 
                 updateRestingArrowDimens()
                 gestureEntryTime = SystemClock.uptimeMillis()
-                gestureInactiveOrEntryTime = SystemClock.uptimeMillis()
             }
             GestureState.ACTIVE -> {
                 previousXTranslationOnActiveOffset = previousXTranslation
@@ -857,7 +864,13 @@ class BackPanelController internal constructor(
             }
 
             GestureState.INACTIVE -> {
-                gestureInactiveOrEntryTime = SystemClock.uptimeMillis()
+
+                // Typically entering INACTIVE means
+                // totalTouchDelta <= deactivationSwipeTriggerThreshold
+                // but because we can also independently enter this state
+                // if touch Y >> touch X, we force it to deactivationSwipeTriggerThreshold
+                // so that gesture progress in this state is consistent regardless of entry
+                totalTouchDelta = params.deactivationSwipeTriggerThreshold
 
                 val startingVelocity = convertVelocityToSpringStartingVelocity(
                         valueOnFastVelocity = -1.05f,
diff --git a/packages/SystemUI/src/com/android/systemui/navigationbar/gestural/EdgePanelParams.kt b/packages/SystemUI/src/com/android/systemui/navigationbar/gestural/EdgePanelParams.kt
index 0c0002221244..d46333a50c8d 100644
--- a/packages/SystemUI/src/com/android/systemui/navigationbar/gestural/EdgePanelParams.kt
+++ b/packages/SystemUI/src/com/android/systemui/navigationbar/gestural/EdgePanelParams.kt
@@ -9,8 +9,8 @@ import com.android.systemui.R
 data class EdgePanelParams(private var resources: Resources) {
 
     data class ArrowDimens(
-            val length: Float = 0f,
-            val height: Float = 0f,
+            val length: Float? = 0f,
+            val height: Float? = 0f,
             val alpha: Float = 0f,
             var alphaSpring: SpringForce? = null,
             val heightSpring: SpringForce? = null,
@@ -139,17 +139,17 @@ data class EdgePanelParams(private var resources: Resources) {
 
         entryWidthInterpolator = PathInterpolator(.19f, 1.27f, .71f, .86f)
         entryWidthTowardsEdgeInterpolator = PathInterpolator(1f, -3f, 1f, 1.2f)
-        activeWidthInterpolator = PathInterpolator(.15f, .48f, .46f, .89f)
+        activeWidthInterpolator = PathInterpolator(.32f, 0f, .16f, .94f)
         arrowAngleInterpolator = entryWidthInterpolator
         translationInterpolator = PathInterpolator(0.2f, 1.0f, 1.0f, 1.0f)
         farCornerInterpolator = PathInterpolator(.03f, .19f, .14f, 1.09f)
         edgeCornerInterpolator = PathInterpolator(0f, 1.11f, .85f, .84f)
         heightInterpolator = PathInterpolator(1f, .05f, .9f, -0.29f)
 
-        val showArrowOnProgressValue = .2f
+        val showArrowOnProgressValue = .23f
         val showArrowOnProgressValueFactor = 1.05f
 
-        val entryActiveHorizontalTranslationSpring = createSpring(675f, 0.8f)
+        val entryActiveHorizontalTranslationSpring = createSpring(800f, 0.8f)
         val activeCommittedArrowLengthSpring = createSpring(1500f, 0.29f)
         val activeCommittedArrowHeightSpring = createSpring(1500f, 0.29f)
         val flungCommittedEdgeCornerSpring = createSpring(10000f, 1f)
@@ -178,7 +178,7 @@ data class EdgePanelParams(private var resources: Resources) {
                         height = getDimen(R.dimen.navigation_edge_entry_background_height),
                         edgeCornerRadius = getDimen(R.dimen.navigation_edge_entry_edge_corners),
                         farCornerRadius = getDimen(R.dimen.navigation_edge_entry_far_corners),
-                        alphaSpring = createSpring(900f, 1f),
+                        alphaSpring = createSpring(1100f, 1f),
                         widthSpring = createSpring(450f, 0.65f),
                         heightSpring = createSpring(1500f, 0.45f),
                         farCornerRadiusSpring = createSpring(300f, 0.5f),
@@ -232,7 +232,7 @@ data class EdgePanelParams(private var resources: Resources) {
                                 getDimen(R.dimen.navigation_edge_pre_threshold_edge_corners),
                         farCornerRadius =
                                 getDimen(R.dimen.navigation_edge_pre_threshold_far_corners),
-                        widthSpring = createSpring(200f, 0.65f),
+                        widthSpring = createSpring(250f, 0.65f),
                         heightSpring = createSpring(1500f, 0.45f),
                         farCornerRadiusSpring = createSpring(200f, 1f),
                         edgeCornerRadiusSpring = createSpring(150f, 0.5f),
@@ -244,6 +244,8 @@ data class EdgePanelParams(private var resources: Resources) {
                 arrowDimens = activeIndicator.arrowDimens.copy(
                         lengthSpring = activeCommittedArrowLengthSpring,
                         heightSpring = activeCommittedArrowHeightSpring,
+                        length = null,
+                        height = null,
                 ),
                 backgroundDimens = activeIndicator.backgroundDimens.copy(
                         alpha = 0f,
@@ -255,13 +257,15 @@ data class EdgePanelParams(private var resources: Resources) {
                         farCornerRadiusSpring = flungCommittedFarCornerSpring,
                 ),
                 scale = 0.85f,
-                scaleSpring = createSpring(650f, 1f),
+                scaleSpring = createSpring(1150f, 1f),
         )
 
         flungIndicator = committedIndicator.copy(
                 arrowDimens = committedIndicator.arrowDimens.copy(
                         lengthSpring = createSpring(850f, 0.46f),
                         heightSpring = createSpring(850f, 0.46f),
+                        length = activeIndicator.arrowDimens.length,
+                        height = activeIndicator.arrowDimens.height
                 ),
                 backgroundDimens = committedIndicator.backgroundDimens.copy(
                         widthSpring = flungCommittedWidthSpring,