Some improvements to home to overview transition for 0 button mode

- Peek in overview further, and with more overshoot
- Fade out and scale down workspace faster while swiping up
- Scale and translate workspace slower when letting go to enter
  overview (so it doesn't zoom out at warp speed)
- Fade in all apps shelf sooner

Bug: 132455160
Change-Id: Ieafad0ccf9bb587889bc35d536627661db10e358

2 files changed, 24 insertions, 3 deletions

diff --git a/quickstep/src/com/android/launcher3/uioverrides/states/AllAppsState.java b/quickstep/src/com/android/launcher3/uioverrides/states/AllAppsState.java
index ab24f5f5a..85a954507 100644
--- a/quickstep/src/com/android/launcher3/uioverrides/states/AllAppsState.java
+++ b/quickstep/src/com/android/launcher3/uioverrides/states/AllAppsState.java
@@ -23,6 +23,7 @@ import com.android.launcher3.Launcher;
 import com.android.launcher3.LauncherState;
 import com.android.launcher3.allapps.AllAppsContainerView;
 import com.android.launcher3.userevent.nano.LauncherLogProto.ContainerType;
+import com.android.quickstep.SysUINavigationMode;
 
 /**
  * Definition for AllApps state
@@ -63,7 +64,13 @@ public class AllAppsState extends LauncherState {
     public ScaleAndTranslation getWorkspaceScaleAndTranslation(Launcher launcher) {
         ScaleAndTranslation scaleAndTranslation = LauncherState.OVERVIEW
                 .getWorkspaceScaleAndTranslation(launcher);
-        scaleAndTranslation.scale = 1;
+        if (SysUINavigationMode.getMode(launcher) == SysUINavigationMode.Mode.NO_BUTTON) {
+            float normalScale = 1;
+            // Scale down halfway to where we'd be in overview, to prepare for a potential pause.
+            scaleAndTranslation.scale = (scaleAndTranslation.scale + normalScale) / 2;
+        } else {
+            scaleAndTranslation.scale = 1;
+        }
         return scaleAndTranslation;
     }
 
diff --git a/quickstep/src/com/android/quickstep/views/ShelfScrimView.java b/quickstep/src/com/android/quickstep/views/ShelfScrimView.java
index 36521e5cc..b6ddb5fd1 100644
--- a/quickstep/src/com/android/quickstep/views/ShelfScrimView.java
+++ b/quickstep/src/com/android/quickstep/views/ShelfScrimView.java
@@ -18,6 +18,7 @@ package com.android.quickstep.views;
 import static com.android.launcher3.LauncherState.BACKGROUND_APP;
 import static com.android.launcher3.LauncherState.OVERVIEW;
 import static com.android.launcher3.anim.Interpolators.ACCEL;
+import static com.android.launcher3.anim.Interpolators.ACCEL_2;
 import static com.android.launcher3.anim.Interpolators.LINEAR;
 import static com.android.launcher3.icons.GraphicsUtils.setColorAlphaBound;
 
@@ -29,6 +30,7 @@ import android.graphics.Path;
 import android.graphics.Path.Direction;
 import android.graphics.Path.Op;
 import android.util.AttributeSet;
+import android.view.animation.Interpolator;
 
 import com.android.launcher3.DeviceProfile;
 import com.android.launcher3.R;
@@ -69,6 +71,9 @@ public class ShelfScrimView extends ScrimView implements NavigationModeChangeLis
     private int mMidAlpha;
     private float mMidProgress;
 
+    private Interpolator mBeforeMidProgressColorInterpolator = ACCEL;
+    private Interpolator mAfterMidProgressColorInterpolator = ACCEL;
+
     private float mShiftRange;
 
     private final float mShelfOffset;
@@ -120,6 +125,15 @@ public class ShelfScrimView extends ScrimView implements NavigationModeChangeLis
     @Override
     public void onNavigationModeChanged(Mode newMode) {
         mSysUINavigationMode = newMode;
+        // Note that these interpolators are inverted because progress goes 1 to 0.
+        if (mSysUINavigationMode == Mode.NO_BUTTON) {
+            // Show the shelf more quickly before reaching overview progress.
+            mBeforeMidProgressColorInterpolator = ACCEL_2;
+            mAfterMidProgressColorInterpolator = ACCEL;
+        } else {
+            mBeforeMidProgressColorInterpolator = ACCEL;
+            mAfterMidProgressColorInterpolator = Interpolators.clampToProgress(ACCEL, 0.5f, 1f);
+        }
     }
 
     @Override
@@ -171,7 +185,7 @@ public class ShelfScrimView extends ScrimView implements NavigationModeChangeLis
             mRemainingScreenColor = 0;
 
             int alpha = Math.round(Utilities.mapToRange(
-                    mProgress, mMidProgress, 1, mMidAlpha, 0, ACCEL));
+                    mProgress, mMidProgress, 1, mMidAlpha, 0, mBeforeMidProgressColorInterpolator));
             mShelfColor = setColorAlphaBound(mEndScrim, alpha);
         } else {
             mDragHandleOffset += mShiftRange * (mMidProgress - mProgress);
@@ -179,7 +193,7 @@ public class ShelfScrimView extends ScrimView implements NavigationModeChangeLis
             // Note that these ranges and interpolators are inverted because progress goes 1 to 0.
             int alpha = Math.round(
                     Utilities.mapToRange(mProgress, (float) 0, mMidProgress, (float) mEndAlpha,
-                            (float) mMidAlpha, Interpolators.clampToProgress(ACCEL, 0.5f, 1f)));
+                            (float) mMidAlpha, mAfterMidProgressColorInterpolator));
             mShelfColor = setColorAlphaBound(mEndScrim, alpha);
 
             int remainingScrimAlpha = Math.round(