Chaniging all-apps scrim

> Converting the scrim to View, to better avoid overdraw
> Overview and Spring loaded state have different scrim alpha
> When going from overview to all-apps, there is a color scrim drawn over the overview panel.
  The slef color is merged with this color to prevent overdraw, and the remaining screen is drawn
  with a cut-out round rect path

Bug: 79111591
Change-Id: I26801fde13dd6adb4b06110bbe8087e35cc31847

18 files changed, 390 insertions, 240 deletions

diff --git a/quickstep/res/layout/scrim_view.xml b/quickstep/res/layout/scrim_view.xml
new file mode 100644
index 000000000..2cc37f9cc
--- /dev/null
+++ b/quickstep/res/layout/scrim_view.xml
@@ -0,0 +1,20 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Copyright (C) 2018 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.
+-->
+<com.android.quickstep.views.ShelfScrimView
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:id="@+id/scrim_view" />
\ No newline at end of file
diff --git a/quickstep/src/com/android/launcher3/uioverrides/AllAppsScrim.java b/quickstep/src/com/android/launcher3/uioverrides/AllAppsScrim.java
deleted file mode 100644
index 3c741b337..000000000
--- a/quickstep/src/com/android/launcher3/uioverrides/AllAppsScrim.java
+++ /dev/null
@@ -1,154 +0,0 @@
-/*
- * Copyright (C) 2018 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.launcher3.uioverrides;
-
-import static com.android.launcher3.anim.Interpolators.ACCEL_2;
-import static com.android.launcher3.anim.Interpolators.DEACCEL_2;
-
-import android.graphics.Canvas;
-import android.graphics.Color;
-import android.graphics.Paint;
-import android.support.v4.graphics.ColorUtils;
-
-import com.android.launcher3.DeviceProfile;
-import com.android.launcher3.Launcher;
-import com.android.launcher3.R;
-import com.android.launcher3.Utilities;
-import com.android.launcher3.allapps.AllAppsContainerView;
-import com.android.launcher3.graphics.ViewScrim;
-import com.android.launcher3.util.Themes;
-
-/**
- * Scrim used for all-apps and shelf in Overview
- * In transposed layout, it behaves as a simple color scrim.
- * In portrait layout, it draws a rounded rect such that
- *    From normal state to overview state, the shelf just fades in and does not move
- *    From overview state to all-apps state the self moves up and fades in to cover the screen
- */
-public class AllAppsScrim extends ViewScrim<AllAppsContainerView> {
-
-    private static final int THRESHOLD_ALPHA_DARK = 102;
-    private static final int THRESHOLD_ALPHA_LIGHT = 46;
-
-    private final Launcher mLauncher;
-    private final int mEndColor;
-
-    private int mProgressColor;
-
-    // In transposed layout, we simply draw a flat color.
-    private boolean mDrawingFlatColor;
-
-    private final Paint mVerticalPaint;
-    private float mVerticalProgress;
-
-    private final int mEndAlpha;
-    private final int mThresholdAlpha;
-    private final float mRadius;
-    private final float mTopPadding;
-
-    // Max vertical progress after which the scrim stops moving.
-    private float mMoveThreshold;
-    // Minimum visible size of the scrim.
-    private int mMinSize;
-    private float mDrawFactor = 0;
-
-    public AllAppsScrim(AllAppsContainerView view) {
-        super(view);
-        mLauncher = Launcher.getLauncher(view.getContext());
-        mEndColor = Themes.getAttrColor(mLauncher, R.attr.allAppsScrimColor);
-        mProgressColor = mEndColor;
-
-        mEndAlpha = Color.alpha(mEndColor);
-        mThresholdAlpha = Themes.getAttrBoolean(mLauncher, R.attr.isMainColorDark)
-                ? THRESHOLD_ALPHA_DARK : THRESHOLD_ALPHA_LIGHT;
-        mRadius = mLauncher.getResources().getDimension(R.dimen.shelf_surface_radius);
-        mTopPadding = mLauncher.getResources().getDimension(R.dimen.shelf_surface_top_padding);
-
-        mVerticalPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
-        mVerticalPaint.setColor(ColorUtils.setAlphaComponent(mEndColor, 255));
-
-        // Just assume the easiest UI for now, until we have the proper layout information.
-        mDrawingFlatColor = true;
-    }
-
-    @Override
-    protected void onProgressChanged() {
-        mProgressColor = ColorUtils.setAlphaComponent(mEndColor,
-                Math.round(DEACCEL_2.getInterpolation(mProgress) * Color.alpha(mEndColor)));
-    }
-
-    @Override
-    public void draw(Canvas canvas, int width, int height) {
-        if (mDrawingFlatColor) {
-            if (mProgress > 0) {
-                canvas.drawColor(mProgressColor);
-            }
-            return;
-        }
-
-        if (mVerticalPaint.getAlpha() == 0) {
-            return;
-        } else if (mDrawFactor <= 0) {
-            canvas.drawPaint(mVerticalPaint);
-        } else {
-            float top = (height - mMinSize) * mDrawFactor - mTopPadding;
-            canvas.drawRoundRect(0, top - mRadius, width, height + mRadius,
-                    mRadius, mRadius, mVerticalPaint);
-        }
-    }
-
-    public void reInitUi() {
-        DeviceProfile dp = mLauncher.getDeviceProfile();
-        mDrawingFlatColor = dp.isVerticalBarLayout();
-
-        if (!mDrawingFlatColor) {
-            float swipeLength = OverviewState.getDefaultSwipeHeight(mLauncher);
-            mMoveThreshold = 1 - swipeLength / mLauncher.getAllAppsController().getShiftRange();
-            mMinSize = dp.hotseatBarSizePx + dp.getInsets().bottom;
-            onVerticalProgress(mVerticalProgress);
-        }
-        invalidate();
-    }
-
-    public void onVerticalProgress(float progress) {
-        mVerticalProgress = progress;
-        if (mDrawingFlatColor) {
-            return;
-        }
-
-        float drawFactor;
-        int alpha;
-        if (mVerticalProgress >= mMoveThreshold) {
-            drawFactor = 1;
-            alpha = mVerticalProgress >= 1 ? 0 : Math.round(mThresholdAlpha
-                    * ACCEL_2.getInterpolation((1 - mVerticalProgress) / (1 - mMoveThreshold)));
-        } else if (mVerticalProgress <= 0) {
-            drawFactor = 0;
-            alpha = mEndAlpha;
-        } else {
-            drawFactor = mVerticalProgress / mMoveThreshold;
-            alpha = mEndAlpha - Math.round((mEndAlpha - mThresholdAlpha) * drawFactor);
-        }
-        alpha = Utilities.boundToRange(alpha, 0, 255);
-        if (alpha != mVerticalPaint.getAlpha() || drawFactor != mDrawFactor) {
-            mVerticalPaint.setAlpha(alpha);
-            mDrawFactor = drawFactor;
-            invalidate();
-        }
-    }
-
-}
diff --git a/quickstep/src/com/android/launcher3/uioverrides/AllAppsState.java b/quickstep/src/com/android/launcher3/uioverrides/AllAppsState.java
index 5a216f6d3..e31805c7e 100644
--- a/quickstep/src/com/android/launcher3/uioverrides/AllAppsState.java
+++ b/quickstep/src/com/android/launcher3/uioverrides/AllAppsState.java
@@ -31,7 +31,7 @@ import com.android.launcher3.userevent.nano.LauncherLogProto.ContainerType;
  */
 public class AllAppsState extends LauncherState {
 
-    private static final int STATE_FLAGS = FLAG_DISABLE_ACCESSIBILITY | FLAG_ALL_APPS_SCRIM;
+    private static final int STATE_FLAGS = FLAG_DISABLE_ACCESSIBILITY;
 
     private static final PageAlphaProvider PAGE_ALPHA_PROVIDER = new PageAlphaProvider(DEACCEL_2) {
         @Override
diff --git a/quickstep/src/com/android/launcher3/uioverrides/FastOverviewState.java b/quickstep/src/com/android/launcher3/uioverrides/FastOverviewState.java
index 89dd87993..0451653f4 100644
--- a/quickstep/src/com/android/launcher3/uioverrides/FastOverviewState.java
+++ b/quickstep/src/com/android/launcher3/uioverrides/FastOverviewState.java
@@ -24,9 +24,8 @@ import com.android.quickstep.views.RecentsView;
  */
 public class FastOverviewState extends OverviewState {
 
-    private static final int STATE_FLAGS = FLAG_SHOW_SCRIM | FLAG_DISABLE_RESTORE
-            | FLAG_DISABLE_INTERACTION | FLAG_OVERVIEW_UI | FLAG_HIDE_BACK_BUTTON
-            | FLAG_DISABLE_ACCESSIBILITY;
+    private static final int STATE_FLAGS = FLAG_DISABLE_RESTORE | FLAG_DISABLE_INTERACTION
+            | FLAG_OVERVIEW_UI | FLAG_HIDE_BACK_BUTTON | FLAG_DISABLE_ACCESSIBILITY;
 
     public FastOverviewState(int id) {
         super(id, QuickScrubController.QUICK_SCRUB_START_DURATION, STATE_FLAGS);
diff --git a/quickstep/src/com/android/launcher3/uioverrides/OverviewState.java b/quickstep/src/com/android/launcher3/uioverrides/OverviewState.java
index 5bdf1b5e9..91e1e7faa 100644
--- a/quickstep/src/com/android/launcher3/uioverrides/OverviewState.java
+++ b/quickstep/src/com/android/launcher3/uioverrides/OverviewState.java
@@ -34,7 +34,7 @@ import com.android.quickstep.views.RecentsView;
  */
 public class OverviewState extends LauncherState {
 
-    private static final int STATE_FLAGS = FLAG_SHOW_SCRIM | FLAG_WORKSPACE_ICONS_CAN_BE_DRAGGED
+    private static final int STATE_FLAGS = FLAG_WORKSPACE_ICONS_CAN_BE_DRAGGED
             | FLAG_DISABLE_RESTORE | FLAG_OVERVIEW_UI | FLAG_DISABLE_ACCESSIBILITY;
 
     public OverviewState(int id) {
@@ -101,6 +101,11 @@ public class OverviewState extends LauncherState {
     }
 
     @Override
+    public float getWorkspaceScrimAlpha(Launcher launcher) {
+        return 0.5f;
+    }
+
+    @Override
     public float getVerticalProgress(Launcher launcher) {
         if ((getVisibleElements(launcher) & ALL_APPS_HEADER_EXTRA) == 0) {
             // We have no all apps content, so we're still at the fully down progress.
diff --git a/quickstep/src/com/android/quickstep/views/ShelfScrimView.java b/quickstep/src/com/android/quickstep/views/ShelfScrimView.java
new file mode 100644
index 000000000..aa0467211
--- /dev/null
+++ b/quickstep/src/com/android/quickstep/views/ShelfScrimView.java
@@ -0,0 +1,196 @@
+/*
+ * Copyright (C) 2018 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.quickstep.views;
+
+import static android.support.v4.graphics.ColorUtils.compositeColors;
+import static android.support.v4.graphics.ColorUtils.setAlphaComponent;
+
+import static com.android.launcher3.LauncherState.OVERVIEW;
+import static com.android.launcher3.anim.Interpolators.ACCEL_2;
+
+import android.content.Context;
+import android.graphics.Canvas;
+import android.graphics.Color;
+import android.graphics.Paint;
+import android.graphics.Path;
+import android.graphics.Path.Direction;
+import android.graphics.Path.Op;
+import android.util.AttributeSet;
+
+import com.android.launcher3.DeviceProfile;
+import com.android.launcher3.Launcher;
+import com.android.launcher3.R;
+import com.android.launcher3.uioverrides.OverviewState;
+import com.android.launcher3.util.Themes;
+import com.android.launcher3.views.ScrimView;
+
+/**
+ * Scrim used for all-apps and shelf in Overview
+ * In transposed layout, it behaves as a simple color scrim.
+ * In portrait layout, it draws a rounded rect such that
+ *    From normal state to overview state, the shelf just fades in and does not move
+ *    From overview state to all-apps state the shelf moves up and fades in to cover the screen
+ */
+public class ShelfScrimView extends ScrimView {
+
+    private static final int THRESHOLD_ALPHA_DARK = 102;
+    private static final int THRESHOLD_ALPHA_LIGHT = 46;
+
+    private final Launcher mLauncher;
+
+    // In transposed layout, we simply draw a flat color.
+    private boolean mDrawingFlatColor;
+
+    // For shelf mode
+    private final int mEndAlpha;
+    private final int mThresholdAlpha;
+    private final float mRadius;
+    private final float mTopPadding;
+    private final float mMaxScrimAlpha;
+    private final Paint mPaint;
+
+    // Max vertical progress after which the scrim stops moving.
+    private float mMoveThreshold;
+    // Minimum visible size of the scrim.
+    private int mMinSize;
+
+    private float mScrimMoveFactor = 0;
+    private int mShelfColor;
+    private int mRemainingScreenColor;
+
+    private final Path mTempPath = new Path();
+    private final Path mRemainingScreenPath = new Path();
+    private boolean mRemainingScreenPathValid = false;
+
+    public ShelfScrimView(Context context, AttributeSet attrs) {
+        super(context, attrs);
+
+        mLauncher = Launcher.getLauncher(context);
+        mMaxScrimAlpha = OVERVIEW.getWorkspaceScrimAlpha(mLauncher);
+
+        mEndAlpha = Color.alpha(mEndScrim);
+        mThresholdAlpha = Themes.getAttrBoolean(mLauncher, R.attr.isMainColorDark)
+                ? THRESHOLD_ALPHA_DARK : THRESHOLD_ALPHA_LIGHT;
+        mRadius = mLauncher.getResources().getDimension(R.dimen.shelf_surface_radius);
+        mTopPadding = mLauncher.getResources().getDimension(R.dimen.shelf_surface_top_padding);
+        mPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
+
+        // Just assume the easiest UI for now, until we have the proper layout information.
+        mDrawingFlatColor = true;
+    }
+
+    @Override
+    protected void onSizeChanged(int w, int h, int oldw, int oldh) {
+        super.onSizeChanged(w, h, oldw, oldh);
+        mRemainingScreenPathValid = false;
+    }
+
+    @Override
+    public void reInitUi() {
+        DeviceProfile dp = mLauncher.getDeviceProfile();
+        mDrawingFlatColor = dp.isVerticalBarLayout();
+
+        if (!mDrawingFlatColor) {
+            float swipeLength = OverviewState.getDefaultSwipeHeight(mLauncher);
+            mMoveThreshold = 1 - swipeLength / mLauncher.getAllAppsController().getShiftRange();
+            mMinSize = dp.hotseatBarSizePx + dp.getInsets().bottom;
+            mRemainingScreenPathValid = false;
+            updateColors();
+        }
+        invalidate();
+    }
+
+
+    @Override
+    public void updateColors() {
+        super.updateColors();
+        if (mDrawingFlatColor) {
+            return;
+        }
+
+        if (mProgress >= mMoveThreshold) {
+            mScrimMoveFactor = 1;
+
+            if (mProgress >= 1) {
+                mShelfColor = 0;
+            } else {
+                int alpha = Math.round(mThresholdAlpha * ACCEL_2.getInterpolation(
+                        (1 - mProgress) / (1 - mMoveThreshold)));
+                mShelfColor = setAlphaComponent(mEndScrim, alpha);
+            }
+            mRemainingScreenColor = 0;
+        } else if (mProgress <= 0) {
+            mScrimMoveFactor = 0;
+            mShelfColor = mCurrentFlatColor;
+            mRemainingScreenColor = 0;
+
+        } else {
+            mScrimMoveFactor = mProgress / mMoveThreshold;
+            mRemainingScreenColor = setAlphaComponent(mScrimColor,
+                    Math.round((1 - mScrimMoveFactor) * mMaxScrimAlpha * 255));
+
+            // Merge the remainingScreenColor and shelfColor in one to avoid overdraw.
+            int alpha = mEndAlpha - Math.round((mEndAlpha - mThresholdAlpha) * mScrimMoveFactor);
+            mShelfColor = compositeColors(setAlphaComponent(mEndScrim, alpha),
+                    mRemainingScreenColor);
+        }
+    }
+
+    @Override
+    protected void onDraw(Canvas canvas) {
+        if (mDrawingFlatColor) {
+            if (mCurrentFlatColor != 0) {
+                canvas.drawColor(mCurrentFlatColor);
+            }
+            return;
+        }
+
+        if (mShelfColor == 0) {
+            return;
+        } else if (mScrimMoveFactor <= 0) {
+            canvas.drawColor(mShelfColor);
+            return;
+        }
+
+        float minTop = getHeight() - mMinSize;
+        float top = minTop * mScrimMoveFactor - mTopPadding - mRadius;
+
+        // Draw the scrim over the remaining screen if needed.
+        if (mRemainingScreenColor != 0) {
+            if (!mRemainingScreenPathValid) {
+                mTempPath.reset();
+                // Using a arbitrary '+10' in the bottom to avoid any left-overs at the
+                // corners due to rounding issues.
+                mTempPath.addRoundRect(0, minTop, getWidth(), getHeight() + mRadius + 10,
+                        mRadius, mRadius, Direction.CW);
+
+                mRemainingScreenPath.reset();
+                mRemainingScreenPath.addRect(0, 0, getWidth(), getHeight(), Direction.CW);
+                mRemainingScreenPath.op(mTempPath, Op.DIFFERENCE);
+            }
+
+            float offset = minTop - top;
+            canvas.translate(0, -offset);
+            mPaint.setColor(mRemainingScreenColor);
+            canvas.drawPath(mRemainingScreenPath, mPaint);
+            canvas.translate(0, offset);
+        }
+
+        mPaint.setColor(mShelfColor);
+        canvas.drawRoundRect(0, top, getWidth(), getHeight() + mRadius,
+                mRadius, mRadius, mPaint);
+    }
+}
diff --git a/res/layout/launcher.xml b/res/layout/launcher.xml
index 6556adffc..cd8a4253b 100644
--- a/res/layout/launcher.xml
+++ b/res/layout/launcher.xml
@@ -57,6 +57,9 @@
             android:id="@+id/drop_target_bar"
             layout="@layout/drop_target_bar" />
 
+        <include android:id="@+id/scrim_view"
+            layout="@layout/scrim_view" />
+
         <include
             android:id="@+id/apps_view"
             layout="@layout/all_apps"
diff --git a/res/layout/scrim_view.xml b/res/layout/scrim_view.xml
new file mode 100644
index 000000000..a604d569d
--- /dev/null
+++ b/res/layout/scrim_view.xml
@@ -0,0 +1,20 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Copyright (C) 2018 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.
+-->
+<com.android.launcher3.views.ScrimView
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:id="@+id/scrim_view" />
\ No newline at end of file
diff --git a/res/values/config.xml b/res/values/config.xml
index 6158f29b3..d5bb131ef 100644
--- a/res/values/config.xml
+++ b/res/values/config.xml
@@ -41,9 +41,6 @@
     <item type="id" name="drag_event_parity" />
 
 <!-- AllApps & Launcher transitions -->
-    <!-- The alpha of the AppsCustomize bg in spring loaded mode -->
-    <integer name="config_workspaceScrimAlpha">76</integer>
-
     <!-- Out of 100, the percent to shrink the workspace during spring loaded mode. -->
     <integer name="config_workspaceSpringLoadShrinkPercentage">90</integer>
 
diff --git a/src/com/android/launcher3/LauncherState.java b/src/com/android/launcher3/LauncherState.java
index 4697b82f8..f548095ef 100644
--- a/src/com/android/launcher3/LauncherState.java
+++ b/src/com/android/launcher3/LauncherState.java
@@ -52,17 +52,15 @@ public class LauncherState {
     public static final int ALL_APPS_CONTENT = 1 << 4;
     public static final int DRAG_HANDLE_INDICATOR = 1 << 5;
 
-    protected static final int FLAG_SHOW_SCRIM = 1 << 0;
-    protected static final int FLAG_MULTI_PAGE = 1 << 1;
-    protected static final int FLAG_DISABLE_ACCESSIBILITY = 1 << 2;
-    protected static final int FLAG_DISABLE_RESTORE = 1 << 3;
-    protected static final int FLAG_WORKSPACE_ICONS_CAN_BE_DRAGGED = 1 << 4;
-    protected static final int FLAG_DISABLE_PAGE_CLIPPING = 1 << 5;
-    protected static final int FLAG_PAGE_BACKGROUNDS = 1 << 6;
-    protected static final int FLAG_ALL_APPS_SCRIM = 1 << 7;
-    protected static final int FLAG_DISABLE_INTERACTION = 1 << 8;
-    protected static final int FLAG_OVERVIEW_UI = 1 << 9;
-    protected static final int FLAG_HIDE_BACK_BUTTON = 1 << 10;
+    protected static final int FLAG_MULTI_PAGE = 1 << 0;
+    protected static final int FLAG_DISABLE_ACCESSIBILITY = 1 << 1;
+    protected static final int FLAG_DISABLE_RESTORE = 1 << 2;
+    protected static final int FLAG_WORKSPACE_ICONS_CAN_BE_DRAGGED = 1 << 3;
+    protected static final int FLAG_DISABLE_PAGE_CLIPPING = 1 << 4;
+    protected static final int FLAG_PAGE_BACKGROUNDS = 1 << 5;
+    protected static final int FLAG_DISABLE_INTERACTION = 1 << 6;
+    protected static final int FLAG_OVERVIEW_UI = 1 << 7;
+    protected static final int FLAG_HIDE_BACK_BUTTON = 1 << 8;
 
     protected static final PageAlphaProvider DEFAULT_ALPHA_PROVIDER =
             new PageAlphaProvider(ACCEL_2) {
@@ -116,9 +114,7 @@ public class LauncherState {
      *
      * @see WorkspaceStateTransitionAnimation
      */
-    public final boolean hasScrim;
     public final boolean hasWorkspacePageBackground;
-    public final boolean hasAllAppsScrim;
 
     public final int transitionDuration;
 
@@ -153,10 +149,7 @@ public class LauncherState {
         this.containerType = containerType;
         this.transitionDuration = transitionDuration;
 
-        this.hasScrim = (flags & FLAG_SHOW_SCRIM) != 0;
         this.hasWorkspacePageBackground = (flags & FLAG_PAGE_BACKGROUNDS) != 0;
-        this.hasAllAppsScrim = (flags & FLAG_ALL_APPS_SCRIM) != 0;
-
         this.hasMultipleVisiblePages = (flags & FLAG_MULTI_PAGE) != 0;
         this.workspaceAccessibilityFlag = (flags & FLAG_DISABLE_ACCESSIBILITY) != 0
                 ? IMPORTANT_FOR_ACCESSIBILITY_NO_HIDE_DESCENDANTS
@@ -215,6 +208,10 @@ public class LauncherState {
         return 1f;
     }
 
+    public float getWorkspaceScrimAlpha(Launcher launcher) {
+        return 0;
+    }
+
     public String getDescription(Launcher launcher) {
         return launcher.getWorkspace().getCurrentPageDescription();
     }
diff --git a/src/com/android/launcher3/WorkspaceStateTransitionAnimation.java b/src/com/android/launcher3/WorkspaceStateTransitionAnimation.java
index 77a45bfc0..8d3d459cc 100644
--- a/src/com/android/launcher3/WorkspaceStateTransitionAnimation.java
+++ b/src/com/android/launcher3/WorkspaceStateTransitionAnimation.java
@@ -96,9 +96,7 @@ public class WorkspaceStateTransitionAnimation {
 
         // Set scrim
         propertySetter.setFloat(ViewScrim.get(mWorkspace), ViewScrim.PROGRESS,
-                state.hasScrim ? 1 : 0, Interpolators.LINEAR);
-        propertySetter.setFloat(ViewScrim.get(mLauncher.getAppsView()), ViewScrim.PROGRESS,
-                state.hasAllAppsScrim ? 1 : 0, Interpolators.LINEAR);
+                state.getWorkspaceScrimAlpha(mLauncher), Interpolators.LINEAR);
     }
 
     public void applyChildState(LauncherState state, CellLayout cl, int childIndex) {
diff --git a/src/com/android/launcher3/allapps/AllAppsContainerView.java b/src/com/android/launcher3/allapps/AllAppsContainerView.java
index 211d98f8e..f8648bba0 100644
--- a/src/com/android/launcher3/allapps/AllAppsContainerView.java
+++ b/src/com/android/launcher3/allapps/AllAppsContainerView.java
@@ -47,7 +47,6 @@ import com.android.launcher3.Launcher;
 import com.android.launcher3.R;
 import com.android.launcher3.Utilities;
 import com.android.launcher3.config.FeatureFlags;
-import com.android.launcher3.uioverrides.AllAppsScrim;
 import com.android.launcher3.keyboard.FocusedItemDecorator;
 import com.android.launcher3.userevent.nano.LauncherLogProto.Target;
 import com.android.launcher3.util.ItemInfoMatcher;
@@ -110,9 +109,6 @@ public class AllAppsContainerView extends SpringRelativeLayout implements DragSo
 
         mAllAppsStore.addUpdateListener(this::onAppsUpdated);
 
-        // Attach a scrim to be drawn behind all-apps and hotseat
-        new AllAppsScrim(this).attach();
-
         addSpringView(R.id.all_apps_header);
         addSpringView(R.id.apps_list_view);
         addSpringView(R.id.all_apps_tabs_view_pager);
diff --git a/src/com/android/launcher3/allapps/AllAppsTransitionController.java b/src/com/android/launcher3/allapps/AllAppsTransitionController.java
index 53d3da6cd..6d70a08bd 100644
--- a/src/com/android/launcher3/allapps/AllAppsTransitionController.java
+++ b/src/com/android/launcher3/allapps/AllAppsTransitionController.java
@@ -26,9 +26,8 @@ import com.android.launcher3.R;
 import com.android.launcher3.anim.AnimationSuccessListener;
 import com.android.launcher3.anim.AnimatorSetBuilder;
 import com.android.launcher3.anim.PropertySetter;
-import com.android.launcher3.uioverrides.AllAppsScrim;
-import com.android.launcher3.graphics.ViewScrim;
 import com.android.launcher3.util.Themes;
+import com.android.launcher3.views.ScrimView;
 
 /**
  * Handles AllApps view transition.
@@ -57,7 +56,7 @@ public class AllAppsTransitionController implements StateHandler, OnDeviceProfil
     };
 
     private AllAppsContainerView mAppsView;
-    private AllAppsScrim mAllAppsScrim;
+    private ScrimView mScrimView;
 
     private final Launcher mLauncher;
     private final boolean mIsDarkTheme;
@@ -117,7 +116,7 @@ public class AllAppsTransitionController implements StateHandler, OnDeviceProfil
      */
     public void setProgress(float progress) {
         mProgress = progress;
-        mAllAppsScrim.onVerticalProgress(progress);
+        mScrimView.setProgress(progress);
         float shiftCurrent = progress * mShiftRange;
 
         mAppsView.setTranslationY(shiftCurrent);
@@ -209,8 +208,7 @@ public class AllAppsTransitionController implements StateHandler, OnDeviceProfil
 
     public void setupViews(AllAppsContainerView appsView) {
         mAppsView = appsView;
-        mAllAppsScrim = (AllAppsScrim) ViewScrim.get(mAppsView);
-        mAllAppsScrim.reInitUi();
+        mScrimView = mLauncher.findViewById(R.id.scrim_view);
     }
 
     /**
@@ -220,8 +218,8 @@ public class AllAppsTransitionController implements StateHandler, OnDeviceProfil
         mScrollRangeDelta = delta;
         mShiftRange = mLauncher.getDeviceProfile().heightPx - mScrollRangeDelta;
 
-        if (mAllAppsScrim != null) {
-            mAllAppsScrim.reInitUi();
+        if (mScrimView != null) {
+            mScrimView.reInitUi();
         }
     }
 
diff --git a/src/com/android/launcher3/graphics/WorkspaceAndHotseatScrim.java b/src/com/android/launcher3/graphics/WorkspaceAndHotseatScrim.java
index 5c991e966..136528db2 100644
--- a/src/com/android/launcher3/graphics/WorkspaceAndHotseatScrim.java
+++ b/src/com/android/launcher3/graphics/WorkspaceAndHotseatScrim.java
@@ -61,7 +61,6 @@ public class WorkspaceAndHotseatScrim extends ViewScrim<Workspace> implements
 
     private int mFullScrimColor;
 
-    private final int mMaxAlpha;
     private int mAlpha = 0;
 
     public WorkspaceAndHotseatScrim(Workspace view) {
@@ -69,7 +68,6 @@ public class WorkspaceAndHotseatScrim extends ViewScrim<Workspace> implements
         mLauncher = Launcher.getLauncher(view.getContext());
         mWallpaperColorInfo = WallpaperColorInfo.getInstance(mLauncher);
 
-        mMaxAlpha = mLauncher.getResources().getInteger(R.integer.config_workspaceScrimAlpha);
         mMaskHeight = Utilities.pxFromDp(ALPHA_MASK_BITMAP_DP,
                 view.getResources().getDisplayMetrics());
 
@@ -108,7 +106,7 @@ public class WorkspaceAndHotseatScrim extends ViewScrim<Workspace> implements
 
     @Override
     protected void onProgressChanged() {
-        mAlpha = Math.round(mMaxAlpha * mProgress);
+        mAlpha = Math.round(255 * mProgress);
     }
 
     @Override
@@ -126,9 +124,9 @@ public class WorkspaceAndHotseatScrim extends ViewScrim<Workspace> implements
     public void onExtractedColorsChanged(WallpaperColorInfo wallpaperColorInfo) {
         // for super light wallpaper it needs to be darken for contrast to workspace
         // for dark wallpapers the text is white so darkening works as well
-        mFullScrimColor = ColorUtils.compositeColors(DARK_SCRIM_COLOR,
-                wallpaperColorInfo.getMainColor());
-        mBottomMaskPaint.setColor(mFullScrimColor);
+        mBottomMaskPaint.setColor(ColorUtils.compositeColors(DARK_SCRIM_COLOR,
+                wallpaperColorInfo.getMainColor()));
+        mFullScrimColor = wallpaperColorInfo.getMainColor();
     }
 
     public Bitmap createDitheredAlphaMask() {
diff --git a/src/com/android/launcher3/states/SpringLoadedState.java b/src/com/android/launcher3/states/SpringLoadedState.java
index 90d3821a3..aa7d0d5a3 100644
--- a/src/com/android/launcher3/states/SpringLoadedState.java
+++ b/src/com/android/launcher3/states/SpringLoadedState.java
@@ -33,7 +33,7 @@ import com.android.launcher3.userevent.nano.LauncherLogProto.ContainerType;
  */
 public class SpringLoadedState extends LauncherState {
 
-    private static final int STATE_FLAGS = FLAG_SHOW_SCRIM | FLAG_MULTI_PAGE |
+    private static final int STATE_FLAGS = FLAG_MULTI_PAGE |
             FLAG_DISABLE_ACCESSIBILITY | FLAG_DISABLE_RESTORE | FLAG_WORKSPACE_ICONS_CAN_BE_DRAGGED |
             FLAG_DISABLE_PAGE_CLIPPING | FLAG_PAGE_BACKGROUNDS | FLAG_HIDE_BACK_BUTTON;
 
@@ -86,6 +86,11 @@ public class SpringLoadedState extends LauncherState {
     }
 
     @Override
+    public float getWorkspaceScrimAlpha(Launcher launcher) {
+        return 0.3f;
+    }
+
+    @Override
     public void onStateDisabled(final Launcher launcher) {
         launcher.getWorkspace().getPageIndicator().setShouldAutoHide(true);
 
diff --git a/src/com/android/launcher3/views/ScrimView.java b/src/com/android/launcher3/views/ScrimView.java
new file mode 100644
index 000000000..b49b56568
--- /dev/null
+++ b/src/com/android/launcher3/views/ScrimView.java
@@ -0,0 +1,111 @@
+/*
+ * Copyright (C) 2018 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.launcher3.views;
+
+import static android.support.v4.graphics.ColorUtils.compositeColors;
+import static android.support.v4.graphics.ColorUtils.setAlphaComponent;
+
+import android.content.Context;
+import android.graphics.Canvas;
+import android.graphics.Color;
+import android.graphics.Rect;
+import android.util.AttributeSet;
+import android.view.View;
+
+import com.android.launcher3.Insettable;
+import com.android.launcher3.R;
+import com.android.launcher3.uioverrides.WallpaperColorInfo;
+import com.android.launcher3.uioverrides.WallpaperColorInfo.OnChangeListener;
+import com.android.launcher3.util.Themes;
+
+/**
+ * Simple scrim which draws a flat color
+ */
+public class ScrimView extends View implements Insettable, OnChangeListener {
+
+    private final WallpaperColorInfo mWallpaperColorInfo;
+    protected final int mEndScrim;
+
+    protected float mMaxScrimAlpha;
+
+    protected float mProgress = 1;
+    protected int mScrimColor;
+
+    protected int mCurrentFlatColor;
+    protected int mEndFlatColor;
+    protected int mEndFlatColorAlpha;
+
+    public ScrimView(Context context, AttributeSet attrs) {
+        super(context, attrs);
+        mWallpaperColorInfo = WallpaperColorInfo.getInstance(context);
+        mEndScrim = Themes.getAttrColor(context, R.attr.allAppsScrimColor);
+
+        mMaxScrimAlpha = 0.7f;
+    }
+
+    @Override
+    public void setInsets(Rect insets) { }
+
+    @Override
+    protected void onAttachedToWindow() {
+        super.onAttachedToWindow();
+        mWallpaperColorInfo.addOnChangeListener(this);
+        onExtractedColorsChanged(mWallpaperColorInfo);
+    }
+
+    @Override
+    protected void onDetachedFromWindow() {
+        super.onDetachedFromWindow();
+        mWallpaperColorInfo.removeOnChangeListener(this);
+    }
+
+    @Override
+    public boolean hasOverlappingRendering() {
+        return false;
+    }
+
+    @Override
+    public void onExtractedColorsChanged(WallpaperColorInfo wallpaperColorInfo) {
+        mScrimColor = wallpaperColorInfo.getMainColor();
+        mEndFlatColor = compositeColors(mEndScrim, setAlphaComponent(
+                mScrimColor, Math.round(mMaxScrimAlpha * 255)));
+        mEndFlatColorAlpha = Color.alpha(mEndFlatColor);
+        updateColors();
+        invalidate();
+    }
+
+    public void setProgress(float progress) {
+        if (mProgress != progress) {
+            mProgress = progress;
+            updateColors();
+            invalidate();
+        }
+    }
+
+    public void reInitUi() { }
+
+    protected void updateColors() {
+        mCurrentFlatColor = mProgress >= 1 ? 0 : setAlphaComponent(
+                mEndFlatColor, Math.round((1 - mProgress) * mEndFlatColorAlpha));
+    }
+
+    @Override
+    protected void onDraw(Canvas canvas) {
+        if (mCurrentFlatColor != 0) {
+            canvas.drawColor(mCurrentFlatColor);
+        }
+    }
+}
diff --git a/src_ui_overrides/com/android/launcher3/uioverrides/AllAppsScrim.java b/src_ui_overrides/com/android/launcher3/uioverrides/AllAppsScrim.java
deleted file mode 100644
index e970c5beb..000000000
--- a/src_ui_overrides/com/android/launcher3/uioverrides/AllAppsScrim.java
+++ /dev/null
@@ -1,39 +0,0 @@
-/*
- * Copyright (C) 2018 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.launcher3.uioverrides;
-
-import static com.android.launcher3.anim.Interpolators.ACCEL_1_5;
-
-import com.android.launcher3.R;
-import com.android.launcher3.allapps.AllAppsContainerView;
-import com.android.launcher3.graphics.ColorScrim;
-import com.android.launcher3.util.Themes;
-
-public class AllAppsScrim extends ColorScrim {
-
-    public AllAppsScrim(AllAppsContainerView view) {
-        super(view, Themes.getAttrColor(view.getContext(), R.attr.allAppsScrimColor), ACCEL_1_5);
-    }
-
-    public void reInitUi() {
-        // No op
-    }
-
-    public void onVerticalProgress(float progress) {
-        // No op
-    }
-}
diff --git a/src_ui_overrides/com/android/launcher3/uioverrides/AllAppsState.java b/src_ui_overrides/com/android/launcher3/uioverrides/AllAppsState.java
index 6366b2d8f..4a2f544e8 100644
--- a/src_ui_overrides/com/android/launcher3/uioverrides/AllAppsState.java
+++ b/src_ui_overrides/com/android/launcher3/uioverrides/AllAppsState.java
@@ -34,7 +34,7 @@ public class AllAppsState extends LauncherState {
 
     private static final float PARALLAX_COEFFICIENT = .125f;
 
-    private static final int STATE_FLAGS = FLAG_DISABLE_ACCESSIBILITY | FLAG_ALL_APPS_SCRIM;
+    private static final int STATE_FLAGS = FLAG_DISABLE_ACCESSIBILITY;
 
     private static final PageAlphaProvider PAGE_ALPHA_PROVIDER = new PageAlphaProvider(DEACCEL_2) {
         @Override