Add spring to workspace scale when going from Hint state to Normal state.

Bug: 151768994
Change-Id: If03d39e5ef6319355a7691d60fc0152de2fc3cec
diff --git a/quickstep/recents_ui_overrides/src/com/android/launcher3/uioverrides/states/QuickstepAtomicAnimationFactory.java b/quickstep/recents_ui_overrides/src/com/android/launcher3/uioverrides/states/QuickstepAtomicAnimationFactory.java
index ba8656d..a0af797 100644
--- a/quickstep/recents_ui_overrides/src/com/android/launcher3/uioverrides/states/QuickstepAtomicAnimationFactory.java
+++ b/quickstep/recents_ui_overrides/src/com/android/launcher3/uioverrides/states/QuickstepAtomicAnimationFactory.java
@@ -24,6 +24,7 @@
 import static com.android.launcher3.LauncherState.NORMAL;
 import static com.android.launcher3.LauncherState.OVERVIEW;
 import static com.android.launcher3.LauncherState.OVERVIEW_PEEK;
+import static com.android.launcher3.WorkspaceStateTransitionAnimation.getSpringScaleAnimator;
 import static com.android.launcher3.anim.Interpolators.ACCEL;
 import static com.android.launcher3.anim.Interpolators.DEACCEL;
 import static com.android.launcher3.anim.Interpolators.DEACCEL_1_7;
@@ -90,6 +91,10 @@
     protected static final int NEXT_INDEX = RecentsAtomicAnimationFactory.NEXT_INDEX
             + MY_ANIM_COUNT;
 
+    // Due to use of physics, duration may differ between devices so we need to calculate and
+    // cache the value.
+    private int mHintToNormalDuration = -1;
+
     public static final long ATOMIC_DURATION_FROM_PAUSED_TO_OVERVIEW = 300;
 
     public QuickstepAtomicAnimationFactory(QuickstepLauncher activity) {
@@ -221,6 +226,14 @@
             config.setInterpolator(ANIM_OVERVIEW_TRANSLATE_X, translationInterpolator);
             config.setInterpolator(ANIM_OVERVIEW_TRANSLATE_Y, translationInterpolator);
             config.setInterpolator(ANIM_OVERVIEW_FADE, OVERSHOOT_1_2);
+        } else if (fromState == HINT_STATE && toState == NORMAL) {
+            config.setInterpolator(ANIM_DEPTH, DEACCEL_3);
+            if (mHintToNormalDuration == -1) {
+                ValueAnimator va = getSpringScaleAnimator(mActivity, mActivity.getWorkspace(),
+                        toState.getWorkspaceScaleAndTranslation(mActivity).scale);
+                mHintToNormalDuration = (int) va.getDuration();
+            }
+            config.duration = Math.max(config.duration, mHintToNormalDuration);
         }
     }
 }
diff --git a/quickstep/recents_ui_overrides/src/com/android/launcher3/uioverrides/touchcontrollers/NoButtonNavbarToOverviewTouchController.java b/quickstep/recents_ui_overrides/src/com/android/launcher3/uioverrides/touchcontrollers/NoButtonNavbarToOverviewTouchController.java
index 4cc8256..9316938 100644
--- a/quickstep/recents_ui_overrides/src/com/android/launcher3/uioverrides/touchcontrollers/NoButtonNavbarToOverviewTouchController.java
+++ b/quickstep/recents_ui_overrides/src/com/android/launcher3/uioverrides/touchcontrollers/NoButtonNavbarToOverviewTouchController.java
@@ -26,6 +26,7 @@
 
 import android.animation.Animator;
 import android.animation.AnimatorSet;
+import android.animation.ObjectAnimator;
 import android.animation.ValueAnimator;
 import android.graphics.PointF;
 import android.util.Log;
@@ -35,6 +36,7 @@
 import com.android.launcher3.LauncherState;
 import com.android.launcher3.Utilities;
 import com.android.launcher3.anim.AnimationSuccessListener;
+import com.android.launcher3.graphics.OverviewScrim;
 import com.android.launcher3.statemanager.StateManager;
 import com.android.launcher3.states.StateAnimationConfig;
 import com.android.launcher3.testing.TestProtocol;
@@ -65,6 +67,9 @@
     // The last recorded displacement before we reached overview.
     private PointF mStartDisplacement = new PointF();
 
+    // Normal to Hint animation has flag SKIP_OVERVIEW, so we update this scrim with this animator.
+    private ObjectAnimator mNormalToHintOverviewScrimAnimator;
+
     public NoButtonNavbarToOverviewTouchController(Launcher l) {
         super(l);
         mRecentsView = l.getOverviewPanel();
@@ -110,11 +115,31 @@
     @Override
     public void onDragStart(boolean start, float startDisplacement) {
         super.onDragStart(start, startDisplacement);
-
+        if (mFromState == NORMAL && mToState == HINT_STATE) {
+            mNormalToHintOverviewScrimAnimator = ObjectAnimator.ofFloat(
+                    mLauncher.getDragLayer().getOverviewScrim(),
+                    OverviewScrim.SCRIM_PROGRESS,
+                    mFromState.getOverviewScrimAlpha(mLauncher),
+                    mToState.getOverviewScrimAlpha(mLauncher));
+        }
         mReachedOverview = false;
     }
 
     @Override
+    protected void updateProgress(float fraction) {
+        super.updateProgress(fraction);
+        if (mNormalToHintOverviewScrimAnimator != null) {
+            mNormalToHintOverviewScrimAnimator.setCurrentFraction(fraction);
+        }
+    }
+
+    @Override
+    public void onDragEnd(float velocity) {
+        super.onDragEnd(velocity);
+        mNormalToHintOverviewScrimAnimator = null;
+    }
+
+    @Override
     protected void updateSwipeCompleteAnimation(ValueAnimator animator, long expectedDuration,
             LauncherState targetState, float velocity, boolean isFling) {
         super.updateSwipeCompleteAnimation(animator, expectedDuration, targetState, velocity,
@@ -132,6 +157,7 @@
         if (mCurrentAnimation == null) {
             return;
         }
+        mNormalToHintOverviewScrimAnimator = null;
         mCurrentAnimation.dispatchOnCancelWithoutCancelRunnable(() -> {
             mLauncher.getStateManager().goToState(OVERVIEW, true, () -> {
                 mReachedOverview = true;
diff --git a/res/values/config.xml b/res/values/config.xml
index 4cbc597..ca25325 100644
--- a/res/values/config.xml
+++ b/res/values/config.xml
@@ -144,6 +144,10 @@
     <item name="staggered_stiffness" type="dimen" format="float">150</item>
     <dimen name="unlock_staggered_velocity_dp_per_s">3dp</dimen>
 
+    <item name="hint_scale_damping_ratio" type="dimen" format="float">0.7</item>
+    <item name="hint_scale_stiffness" type="dimen" format="float">200</item>
+    <dimen name="hint_scale_velocity_dp_per_s">0.3dp</dimen>
+
     <!-- Swipe up to home related -->
     <dimen name="swipe_up_fling_min_visible_change">18dp</dimen>
     <dimen name="swipe_up_y_overshoot">10dp</dimen>
@@ -175,6 +179,10 @@
 
         <item>@dimen/swipe_up_fling_min_visible_change</item>
         <item>@dimen/swipe_up_y_overshoot</item>
+
+        <item>@dimen/hint_scale_damping_ratio</item>
+        <item>@dimen/hint_scale_stiffness</item>
+        <item>@dimen/hint_scale_velocity_dp_per_s</item>
     </array>
 
     <string-array name="live_wallpapers_remove_sysui_scrims">
diff --git a/src/com/android/launcher3/WorkspaceStateTransitionAnimation.java b/src/com/android/launcher3/WorkspaceStateTransitionAnimation.java
index 06a73db..cd938e1 100644
--- a/src/com/android/launcher3/WorkspaceStateTransitionAnimation.java
+++ b/src/com/android/launcher3/WorkspaceStateTransitionAnimation.java
@@ -16,6 +16,8 @@
 
 package com.android.launcher3;
 
+import static androidx.dynamicanimation.animation.DynamicAnimation.MIN_VISIBLE_CHANGE_SCALE;
+
 import static com.android.launcher3.LauncherAnimUtils.DRAWABLE_ALPHA;
 import static com.android.launcher3.LauncherAnimUtils.SCALE_PROPERTY;
 import static com.android.launcher3.LauncherAnimUtils.VIEW_ALPHA;
@@ -23,11 +25,13 @@
 import static com.android.launcher3.LauncherAnimUtils.VIEW_TRANSLATE_Y;
 import static com.android.launcher3.LauncherState.FLAG_HAS_SYS_UI_SCRIM;
 import static com.android.launcher3.LauncherState.FLAG_WORKSPACE_HAS_BACKGROUNDS;
+import static com.android.launcher3.LauncherState.HINT_STATE;
 import static com.android.launcher3.LauncherState.HOTSEAT_ICONS;
+import static com.android.launcher3.LauncherState.NORMAL;
 import static com.android.launcher3.anim.Interpolators.LINEAR;
 import static com.android.launcher3.anim.Interpolators.ZOOM_OUT;
 import static com.android.launcher3.anim.PropertySetter.NO_ANIM_PROPERTY_SETTER;
-import static com.android.launcher3.graphics.WorkspaceAndHotseatScrim.SCRIM_PROGRESS;
+import static com.android.launcher3.graphics.Scrim.SCRIM_PROGRESS;
 import static com.android.launcher3.graphics.WorkspaceAndHotseatScrim.SYSUI_PROGRESS;
 import static com.android.launcher3.states.StateAnimationConfig.ANIM_HOTSEAT_SCALE;
 import static com.android.launcher3.states.StateAnimationConfig.ANIM_HOTSEAT_TRANSLATE;
@@ -35,6 +39,7 @@
 import static com.android.launcher3.states.StateAnimationConfig.ANIM_WORKSPACE_SCALE;
 import static com.android.launcher3.states.StateAnimationConfig.ANIM_WORKSPACE_TRANSLATE;
 
+import android.animation.ValueAnimator;
 import android.view.View;
 import android.view.animation.Interpolator;
 
@@ -43,8 +48,11 @@
 import com.android.launcher3.allapps.AllAppsContainerView;
 import com.android.launcher3.anim.PendingAnimation;
 import com.android.launcher3.anim.PropertySetter;
+import com.android.launcher3.anim.SpringAnimationBuilder;
 import com.android.launcher3.graphics.WorkspaceAndHotseatScrim;
 import com.android.launcher3.states.StateAnimationConfig;
+import com.android.launcher3.util.DynamicResource;
+import com.android.systemui.plugins.ResourceProvider;
 
 /**
  * Manages the animations between each of the workspace states.
@@ -104,17 +112,32 @@
         View qsbView = qsbScaleView.getSearchView();
         if (playAtomicComponent) {
             Interpolator scaleInterpolator = config.getInterpolator(ANIM_WORKSPACE_SCALE, ZOOM_OUT);
-            propertySetter.setFloat(mWorkspace, SCALE_PROPERTY, mNewScale, scaleInterpolator);
+            LauncherState fromState = mLauncher.getStateManager().getState();
+            boolean shouldSpring = propertySetter instanceof PendingAnimation
+                    && fromState == HINT_STATE && state == NORMAL;
+            if (shouldSpring) {
+                ((PendingAnimation) propertySetter).add(getSpringScaleAnimator(mLauncher,
+                        mWorkspace, mNewScale));
+            } else {
+                propertySetter.setFloat(mWorkspace, SCALE_PROPERTY, mNewScale, scaleInterpolator);
+            }
 
             setPivotToScaleWithWorkspace(hotseat);
             setPivotToScaleWithWorkspace(qsbScaleView);
             float hotseatScale = hotseatScaleAndTranslation.scale;
-            Interpolator hotseatScaleInterpolator = config.getInterpolator(ANIM_HOTSEAT_SCALE,
-                    scaleInterpolator);
-            propertySetter.setFloat(hotseat, SCALE_PROPERTY, hotseatScale,
-                    hotseatScaleInterpolator);
-            propertySetter.setFloat(qsbScaleView, SCALE_PROPERTY, qsbScaleAndTranslation.scale,
-                    hotseatScaleInterpolator);
+            if (shouldSpring) {
+                PendingAnimation pa = (PendingAnimation) propertySetter;
+                pa.add(getSpringScaleAnimator(mLauncher, hotseat, hotseatScale));
+                pa.add(getSpringScaleAnimator(mLauncher, qsbScaleView,
+                        qsbScaleAndTranslation.scale));
+            } else {
+                Interpolator hotseatScaleInterpolator = config.getInterpolator(ANIM_HOTSEAT_SCALE,
+                        scaleInterpolator);
+                propertySetter.setFloat(hotseat, SCALE_PROPERTY, hotseatScale,
+                        hotseatScaleInterpolator);
+                propertySetter.setFloat(qsbScaleView, SCALE_PROPERTY, qsbScaleAndTranslation.scale,
+                        hotseatScaleInterpolator);
+            }
 
             float hotseatIconsAlpha = (elements & HOTSEAT_ICONS) != 0 ? 1 : 0;
             propertySetter.setViewAlpha(hotseat, hotseatIconsAlpha, fadeInterpolator);
@@ -191,4 +214,24 @@
                     pageAlpha, fadeInterpolator);
         }
     }
+
+    /**
+     * Returns a spring based animator for the scale property of {@param v}.
+     */
+    public static ValueAnimator getSpringScaleAnimator(Launcher launcher, View v, float scale) {
+        ResourceProvider rp = DynamicResource.provider(launcher);
+        float damping = rp.getFloat(R.dimen.hint_scale_damping_ratio);
+        float stiffness = rp.getFloat(R.dimen.hint_scale_stiffness);
+        float velocityPxPerS = rp.getDimension(R.dimen.hint_scale_velocity_dp_per_s);
+
+        return new SpringAnimationBuilder(v.getContext())
+                .setStiffness(stiffness)
+                .setDampingRatio(damping)
+                .setMinimumVisibleChange(MIN_VISIBLE_CHANGE_SCALE)
+                .setEndValue(scale)
+                .setStartValue(SCALE_PROPERTY.get(v))
+                .setStartVelocity(velocityPxPerS)
+                .build(v, SCALE_PROPERTY);
+
+    }
 }
\ No newline at end of file
diff --git a/src/com/android/launcher3/states/HintState.java b/src/com/android/launcher3/states/HintState.java
index 9ea8436..b8a184f 100644
--- a/src/com/android/launcher3/states/HintState.java
+++ b/src/com/android/launcher3/states/HintState.java
@@ -39,8 +39,18 @@
     }
 
     @Override
+    protected float getDepthUnchecked(Context context) {
+        return 0.15f;
+    }
+
+    @Override
+    public float getOverviewScrimAlpha(Launcher launcher) {
+        return 0.4f;
+    }
+
+    @Override
     public ScaleAndTranslation getWorkspaceScaleAndTranslation(Launcher launcher) {
-        return new ScaleAndTranslation(0.9f, 0, 0);
+        return new ScaleAndTranslation(0.92f, 0, 0);
     }
 
     @Override