Converting widget panel into a floating view

> The widget panel is only inflated when needed
> Using the swipe up/down interaction for widgets tray
> Removing additional view wrappers from all-apps
> Widget tray is preserved across activity recreation
> Launcher no longer has WIDGET state, the actual code around
  the states will be removed in a follow-up cl

Bug: 67678570
Bug: 67585158
Change-Id: Ia29a7c33ec81e6c53cc24e2906b7022b6f41755b

8 files changed, 615 insertions, 510 deletions

diff --git a/src/com/android/launcher3/widget/BaseWidgetSheet.java b/src/com/android/launcher3/widget/BaseWidgetSheet.java
new file mode 100644
index 000000000..ee5dd66bd
--- /dev/null
+++ b/src/com/android/launcher3/widget/BaseWidgetSheet.java
@@ -0,0 +1,288 @@
+/*
+ * Copyright (C) 2017 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.widget;
+
+import android.animation.Animator;
+import android.animation.AnimatorListenerAdapter;
+import android.animation.ObjectAnimator;
+import android.animation.PropertyValuesHolder;
+import android.content.Context;
+import android.graphics.Point;
+import android.util.AttributeSet;
+import android.util.Property;
+import android.view.MotionEvent;
+import android.view.View;
+import android.view.View.OnClickListener;
+import android.view.View.OnLongClickListener;
+import android.view.animation.AccelerateInterpolator;
+import android.view.animation.DecelerateInterpolator;
+import android.widget.Toast;
+
+import com.android.launcher3.AbstractFloatingView;
+import com.android.launcher3.DeleteDropTarget;
+import com.android.launcher3.DragSource;
+import com.android.launcher3.DropTarget.DragObject;
+import com.android.launcher3.ItemInfo;
+import com.android.launcher3.Launcher;
+import com.android.launcher3.LauncherAnimUtils;
+import com.android.launcher3.R;
+import com.android.launcher3.Utilities;
+import com.android.launcher3.dragndrop.DragOptions;
+import com.android.launcher3.folder.Folder;
+import com.android.launcher3.graphics.GradientView;
+import com.android.launcher3.touch.SwipeDetector;
+import com.android.launcher3.userevent.nano.LauncherLogProto.ContainerType;
+import com.android.launcher3.userevent.nano.LauncherLogProto.Target;
+import com.android.launcher3.util.SystemUiController;
+import com.android.launcher3.util.Themes;
+
+/**
+ * Base class for various widgets popup
+ */
+abstract class BaseWidgetSheet extends AbstractFloatingView
+        implements OnClickListener, OnLongClickListener, DragSource, SwipeDetector.Listener {
+
+
+    protected static Property<BaseWidgetSheet, Float> TRANSLATION_SHIFT =
+            new Property<BaseWidgetSheet, Float>(Float.class, "translationShift") {
+
+                @Override
+                public Float get(BaseWidgetSheet view) {
+                    return view.mTranslationShift;
+                }
+
+                @Override
+                public void set(BaseWidgetSheet view, Float value) {
+                    view.setTranslationShift(value);
+                }
+            };
+    protected static final float TRANSLATION_SHIFT_CLOSED = 1f;
+    protected static final float TRANSLATION_SHIFT_OPENED = 0f;
+
+    /* Touch handling related member variables. */
+    private Toast mWidgetInstructionToast;
+
+    protected final Launcher mLauncher;
+    protected final SwipeDetector.ScrollInterpolator mScrollInterpolator;
+    protected final SwipeDetector mSwipeDetector;
+    protected final ObjectAnimator mOpenCloseAnimator;
+
+    protected View mContent;
+    protected GradientView mGradientView;
+
+    // range [0, 1], 0=> completely open, 1=> completely closed
+    protected float mTranslationShift = TRANSLATION_SHIFT_CLOSED;
+
+    protected boolean mNoIntercept;
+
+    public BaseWidgetSheet(Context context, AttributeSet attrs, int defStyleAttr) {
+        super(context, attrs, defStyleAttr);
+        mLauncher = Launcher.getLauncher(context);
+
+        mScrollInterpolator = new SwipeDetector.ScrollInterpolator();
+        mSwipeDetector = new SwipeDetector(context, this, SwipeDetector.VERTICAL);
+
+        mOpenCloseAnimator = LauncherAnimUtils.ofPropertyValuesHolder(this);
+        mOpenCloseAnimator.addListener(new AnimatorListenerAdapter() {
+            @Override
+            public void onAnimationEnd(Animator animation) {
+                mSwipeDetector.finishedScrolling();
+            }
+        });
+    }
+
+    @Override
+    public final void onClick(View v) {
+        // Let the user know that they have to long press to add a widget
+        if (mWidgetInstructionToast != null) {
+            mWidgetInstructionToast.cancel();
+        }
+
+        CharSequence msg = Utilities.wrapForTts(
+                getContext().getText(R.string.long_press_widget_to_add),
+                getContext().getString(R.string.long_accessible_way_to_add));
+        mWidgetInstructionToast = Toast.makeText(getContext(), msg, Toast.LENGTH_SHORT);
+        mWidgetInstructionToast.show();
+    }
+
+    @Override
+    public final boolean onLongClick(View v) {
+        if (!mLauncher.isDraggingEnabled()) return false;
+
+        if (v instanceof WidgetCell) {
+            return beginDraggingWidget((WidgetCell) v);
+        }
+        return true;
+    }
+
+    protected void setTranslationShift(float translationShift) {
+        mTranslationShift = translationShift;
+        mGradientView.setAlpha(1 - mTranslationShift);
+        mContent.setTranslationY(mTranslationShift * mContent.getHeight());
+    }
+
+    private boolean beginDraggingWidget(WidgetCell v) {
+        // Get the widget preview as the drag representation
+        WidgetImageView image = v.getWidgetView();
+
+        // If the ImageView doesn't have a drawable yet, the widget preview hasn't been loaded and
+        // we abort the drag.
+        if (image.getBitmap() == null) {
+            return false;
+        }
+
+        int[] loc = new int[2];
+        mLauncher.getDragLayer().getLocationInDragLayer(image, loc);
+
+        new PendingItemDragHelper(v).startDrag(
+                image.getBitmapBounds(), image.getBitmap().getWidth(), image.getWidth(),
+                new Point(loc[0], loc[1]), this, new DragOptions());
+        close(true);
+        return true;
+    }
+
+    //
+    // Drag related handling methods that implement {@link DragSource} interface.
+    //
+
+    @Override
+    public void onDropCompleted(View target, DragObject d, boolean isFlingToDelete,
+            boolean success) {
+        if (isFlingToDelete || !success || (target != mLauncher.getWorkspace() &&
+                !(target instanceof DeleteDropTarget) && !(target instanceof Folder))) {
+            // Exit spring loaded mode if we have not successfully dropped or have not handled the
+            // drop in Workspace
+            mLauncher.exitSpringLoadedDragModeDelayed(true,
+                    Launcher.EXIT_SPRINGLOADED_MODE_SHORT_TIMEOUT, null);
+        }
+        mLauncher.unlockScreenOrientation(false);
+
+        if (!success) {
+            d.deferDragViewCleanupPostAnimation = false;
+        }
+    }
+
+
+    @Override
+    public boolean onControllerInterceptTouchEvent(MotionEvent ev) {
+        if (ev.getAction() == MotionEvent.ACTION_UP && !mNoIntercept) {
+            // If we got ACTION_UP without ever returning true on intercept,
+            // the user never started dragging the bottom sheet.
+            if (!mLauncher.getDragLayer().isEventOverView(mContent, ev)) {
+                close(true);
+                return false;
+            }
+        }
+
+        if (mNoIntercept) {
+            return false;
+        }
+
+        int directionsToDetectScroll = mSwipeDetector.isIdleState() ?
+                SwipeDetector.DIRECTION_NEGATIVE : 0;
+        mSwipeDetector.setDetectableScrollConditions(
+                directionsToDetectScroll, false);
+        mSwipeDetector.onTouchEvent(ev);
+        return mSwipeDetector.isDraggingOrSettling();
+    }
+
+    @Override
+    public boolean onControllerTouchEvent(MotionEvent ev) {
+        return mSwipeDetector.onTouchEvent(ev);
+    }
+
+    /* SwipeDetector.Listener */
+
+    @Override
+    public void onDragStart(boolean start) { }
+
+    @Override
+    public boolean onDrag(float displacement, float velocity) {
+        float range = mContent.getHeight();
+        displacement = Utilities.boundToRange(displacement, 0, range);
+        setTranslationShift(displacement / range);
+        return true;
+    }
+
+    @Override
+    public void onDragEnd(float velocity, boolean fling) {
+        if ((fling && velocity > 0) || mTranslationShift > 0.5f) {
+            mScrollInterpolator.setVelocityAtZero(velocity);
+            mOpenCloseAnimator.setDuration(SwipeDetector.calculateDuration(
+                    velocity, TRANSLATION_SHIFT_CLOSED - mTranslationShift));
+            close(true);
+        } else {
+            mOpenCloseAnimator.setValues(PropertyValuesHolder.ofFloat(
+                    TRANSLATION_SHIFT, TRANSLATION_SHIFT_OPENED));
+            mOpenCloseAnimator.setDuration(
+                    SwipeDetector.calculateDuration(velocity, mTranslationShift))
+                    .setInterpolator(new DecelerateInterpolator());
+            mOpenCloseAnimator.start();
+        }
+    }
+
+    protected void handleClose(boolean animate, long defaultDuration) {
+        if (!mIsOpen || mOpenCloseAnimator.isRunning()) {
+            return;
+        }
+        if (animate) {
+            mOpenCloseAnimator.setValues(
+                    PropertyValuesHolder.ofFloat(TRANSLATION_SHIFT, TRANSLATION_SHIFT_CLOSED));
+            mOpenCloseAnimator.addListener(new AnimatorListenerAdapter() {
+                @Override
+                public void onAnimationEnd(Animator animation) {
+                    onCloseComplete();
+                }
+            });
+            if (mSwipeDetector.isIdleState()) {
+                mOpenCloseAnimator
+                        .setDuration(defaultDuration)
+                        .setInterpolator(new AccelerateInterpolator());
+            } else {
+                mOpenCloseAnimator.setInterpolator(mScrollInterpolator);
+            }
+            mOpenCloseAnimator.start();
+        } else {
+            setTranslationShift(TRANSLATION_SHIFT_CLOSED);
+            onCloseComplete();
+        }
+    }
+
+    protected void onCloseComplete() {
+        mIsOpen = false;
+        mLauncher.getDragLayer().removeView(this);
+        mLauncher.getSystemUiController().updateUiState(
+                SystemUiController.UI_STATE_WIDGET_BOTTOM_SHEET, 0);
+    }
+
+    protected void setupNavBarColor() {
+        boolean isSheetDark = Themes.getAttrBoolean(mLauncher, R.attr.isMainColorDark);
+        mLauncher.getSystemUiController().updateUiState(
+                SystemUiController.UI_STATE_WIDGET_BOTTOM_SHEET,
+                isSheetDark ? SystemUiController.FLAG_DARK_NAV : SystemUiController.FLAG_LIGHT_NAV);
+    }
+
+    @Override
+    public void fillInLogContainerData(View v, ItemInfo info, Target target, Target targetParent) {
+        targetParent.containerType = ContainerType.WIDGETS;
+    }
+
+    @Override
+    public final void logActionCommand(int command) {
+        // TODO: be more specific
+        mLauncher.getUserEventDispatcher().logActionCommand(command, ContainerType.WIDGETS);
+    }
+}
diff --git a/src/com/android/launcher3/widget/WidgetCell.java b/src/com/android/launcher3/widget/WidgetCell.java
index 40dbd523c..2ba55ab97 100644
--- a/src/com/android/launcher3/widget/WidgetCell.java
+++ b/src/com/android/launcher3/widget/WidgetCell.java
@@ -75,6 +75,9 @@ public class WidgetCell extends LinearLayout implements OnLayoutChangeListener {
     protected CancellationSignal mActiveRequest;
     private boolean mAnimatePreview = true;
 
+    private boolean mApplyBitmapDeferred = false;
+    private Bitmap mDeferredBitmap;
+
     protected final BaseActivity mActivity;
 
     public WidgetCell(Context context) {
@@ -150,15 +153,31 @@ public class WidgetCell extends LinearLayout implements OnLayoutChangeListener {
         return mWidgetImage;
     }
 
+    /**
+     * Sets if applying bitmap preview should be deferred. The UI will still load the bitmap, but
+     * will not cause invalidate, so that when deferring is disabled later, all the bitmaps are
+     * ready.
+     * This prevents invalidates while the animation is running.
+     */
+    public void setApplyBitmapDeferred(boolean isDeferred) {
+        if (mApplyBitmapDeferred != isDeferred) {
+            mApplyBitmapDeferred = isDeferred;
+            if (!mApplyBitmapDeferred && mDeferredBitmap != null) {
+                applyPreview(mDeferredBitmap);
+                mDeferredBitmap = null;
+            }
+        }
+    }
+
     public void setAnimatePreview(boolean shouldAnimate) {
         mAnimatePreview = shouldAnimate;
     }
 
     public void applyPreview(Bitmap bitmap) {
-        applyPreview(bitmap, true);
-    }
-
-    public void applyPreview(Bitmap bitmap, boolean animate) {
+        if (mApplyBitmapDeferred) {
+            mDeferredBitmap = bitmap;
+            return;
+        }
         if (bitmap != null) {
             mWidgetImage.setBitmap(bitmap,
                     DrawableFactory.get(getContext()).getBadgeForUser(mItem.user, getContext()));
@@ -173,15 +192,11 @@ public class WidgetCell extends LinearLayout implements OnLayoutChangeListener {
     }
 
     public void ensurePreview() {
-        ensurePreview(true);
-    }
-
-    public void ensurePreview(boolean animate) {
         if (mActiveRequest != null) {
             return;
         }
         mActiveRequest = mWidgetPreviewLoader.getPreview(
-                mItem, mPresetPreviewSize, mPresetPreviewSize, this, animate);
+                mItem, mPresetPreviewSize, mPresetPreviewSize, this);
     }
 
     @Override
diff --git a/src/com/android/launcher3/widget/WidgetsBottomSheet.java b/src/com/android/launcher3/widget/WidgetsBottomSheet.java
index 7aa50a445..201bd1c9c 100644
--- a/src/com/android/launcher3/widget/WidgetsBottomSheet.java
+++ b/src/com/android/launcher3/widget/WidgetsBottomSheet.java
@@ -16,62 +16,38 @@
 
 package com.android.launcher3.widget;
 
-import android.animation.Animator;
-import android.animation.AnimatorListenerAdapter;
-import android.animation.ObjectAnimator;
+import android.animation.PropertyValuesHolder;
 import android.content.Context;
 import android.graphics.Rect;
 import android.util.AttributeSet;
 import android.view.Gravity;
 import android.view.LayoutInflater;
-import android.view.MotionEvent;
 import android.view.View;
 import android.view.ViewGroup;
 import android.view.animation.AnimationUtils;
 import android.view.animation.Interpolator;
 import android.widget.TextView;
 
-import com.android.launcher3.AbstractFloatingView;
-import com.android.launcher3.DropTarget;
 import com.android.launcher3.Insettable;
 import com.android.launcher3.ItemInfo;
-import com.android.launcher3.Launcher;
-import com.android.launcher3.LauncherAnimUtils;
 import com.android.launcher3.LauncherAppState;
 import com.android.launcher3.R;
 import com.android.launcher3.Utilities;
-import com.android.launcher3.anim.PropertyListBuilder;
-import com.android.launcher3.dragndrop.DragController;
-import com.android.launcher3.dragndrop.DragOptions;
 import com.android.launcher3.graphics.GradientView;
 import com.android.launcher3.model.WidgetItem;
-import com.android.launcher3.touch.SwipeDetector;
-import com.android.launcher3.userevent.nano.LauncherLogProto.ContainerType;
 import com.android.launcher3.util.PackageUserKey;
-import com.android.launcher3.util.SystemUiController;
-import com.android.launcher3.util.Themes;
 
 import java.util.List;
 
 /**
  * Bottom sheet for the "Widgets" system shortcut in the long-press popup.
  */
-public class WidgetsBottomSheet extends AbstractFloatingView implements Insettable,
-        SwipeDetector.Listener, View.OnClickListener, View.OnLongClickListener,
-        DragController.DragListener {
+public class WidgetsBottomSheet extends BaseWidgetSheet implements Insettable {
 
-    private int mTranslationYOpen;
-    private int mTranslationYClosed;
-    private float mTranslationYRange;
-
-    private Launcher mLauncher;
+    private static final int DEFAULT_CLOSE_DURATION = 200;
     private ItemInfo mOriginalItemInfo;
-    private ObjectAnimator mOpenCloseAnimator;
     private Interpolator mFastOutSlowInInterpolator;
-    private SwipeDetector.ScrollInterpolator mScrollInterpolator;
     private Rect mInsets;
-    private SwipeDetector mSwipeDetector;
-    private GradientView mGradientBackground;
 
     public WidgetsBottomSheet(Context context, AttributeSet attrs) {
         this(context, attrs, 0);
@@ -80,23 +56,20 @@ public class WidgetsBottomSheet extends AbstractFloatingView implements Insettab
     public WidgetsBottomSheet(Context context, AttributeSet attrs, int defStyleAttr) {
         super(context, attrs, defStyleAttr);
         setWillNotDraw(false);
-        mLauncher = Launcher.getLauncher(context);
-        mOpenCloseAnimator = LauncherAnimUtils.ofPropertyValuesHolder(this);
         mFastOutSlowInInterpolator =
                 AnimationUtils.loadInterpolator(context, android.R.interpolator.fast_out_slow_in);
-        mScrollInterpolator = new SwipeDetector.ScrollInterpolator();
         mInsets = new Rect();
-        mSwipeDetector = new SwipeDetector(context, this, SwipeDetector.VERTICAL);
-        mGradientBackground = (GradientView) mLauncher.getLayoutInflater().inflate(
+
+        mGradientView = (GradientView) mLauncher.getLayoutInflater().inflate(
                 R.layout.gradient_bg, mLauncher.getDragLayer(), false);
+        mGradientView.setProgress(1, false);
+        mContent = this;
     }
 
     @Override
-    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
-        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
-        mTranslationYOpen = 0;
-        mTranslationYClosed = getMeasuredHeight();
-        mTranslationYRange = mTranslationYClosed - mTranslationYOpen;
+    protected void onLayout(boolean changed, int l, int t, int r, int b) {
+        super.onLayout(changed, l, t, r, b);
+        setTranslationShift(mTranslationShift);
     }
 
     public void populateAndShow(ItemInfo itemInfo) {
@@ -106,21 +79,21 @@ public class WidgetsBottomSheet extends AbstractFloatingView implements Insettab
 
         onWidgetsBound();
 
-        mLauncher.getDragLayer().addView(mGradientBackground);
+        mLauncher.getDragLayer().addView(mGradientView);
         mLauncher.getDragLayer().addView(this);
-        measure(MeasureSpec.UNSPECIFIED, MeasureSpec.UNSPECIFIED);
-        setTranslationY(mTranslationYClosed);
         mIsOpen = false;
         open(true);
     }
 
     @Override
     protected void onWidgetsBound() {
-        List<WidgetItem> widgets = mLauncher.getWidgetsForPackageUser(new PackageUserKey(
-                mOriginalItemInfo.getTargetComponent().getPackageName(), mOriginalItemInfo.user));
+        List<WidgetItem> widgets = mLauncher.getPopupDataProvider().getWidgetsForPackageUser(
+                new PackageUserKey(
+                        mOriginalItemInfo.getTargetComponent().getPackageName(),
+                        mOriginalItemInfo.user));
 
-        ViewGroup widgetRow = (ViewGroup) findViewById(R.id.widgets);
-        ViewGroup widgetCells = (ViewGroup) widgetRow.findViewById(R.id.widgets_cell_list);
+        ViewGroup widgetRow = findViewById(R.id.widgets);
+        ViewGroup widgetCells = widgetRow.findViewById(R.id.widgets_cell_list);
 
         widgetCells.removeAllViews();
 
@@ -166,72 +139,31 @@ public class WidgetsBottomSheet extends AbstractFloatingView implements Insettab
         return widget;
     }
 
-    @Override
-    public void onClick(View view) {
-        mLauncher.getWidgetsView().handleClick();
-    }
-
-    @Override
-    public boolean onLongClick(View view) {
-        mLauncher.getDragController().addDragListener(this);
-        return mLauncher.getWidgetsView().handleLongClick(view);
-    }
-
     private void open(boolean animate) {
         if (mIsOpen || mOpenCloseAnimator.isRunning()) {
             return;
         }
         mIsOpen = true;
-        boolean isSheetDark = Themes.getAttrBoolean(mLauncher, R.attr.isMainColorDark);
-        mLauncher.getSystemUiController().updateUiState(
-                SystemUiController.UI_STATE_WIDGET_BOTTOM_SHEET,
-                isSheetDark ? SystemUiController.FLAG_DARK_NAV : SystemUiController.FLAG_LIGHT_NAV);
+        setupNavBarColor();
         if (animate) {
-            mOpenCloseAnimator.setValues(new PropertyListBuilder()
-                    .translationY(mTranslationYOpen).build());
-            mOpenCloseAnimator.addListener(new AnimatorListenerAdapter() {
-                @Override
-                public void onAnimationEnd(Animator animation) {
-                    mSwipeDetector.finishedScrolling();
-                }
-            });
+            mOpenCloseAnimator.setValues(
+                    PropertyValuesHolder.ofFloat(TRANSLATION_SHIFT, TRANSLATION_SHIFT_OPENED));
             mOpenCloseAnimator.setInterpolator(mFastOutSlowInInterpolator);
             mOpenCloseAnimator.start();
         } else {
-            setTranslationY(mTranslationYOpen);
+            setTranslationShift(TRANSLATION_SHIFT_OPENED);
         }
     }
 
     @Override
     protected void handleClose(boolean animate) {
-        if (!mIsOpen || mOpenCloseAnimator.isRunning()) {
-            return;
-        }
-        if (animate) {
-            mOpenCloseAnimator.setValues(new PropertyListBuilder()
-                    .translationY(mTranslationYClosed).build());
-            mOpenCloseAnimator.addListener(new AnimatorListenerAdapter() {
-                @Override
-                public void onAnimationEnd(Animator animation) {
-                    mSwipeDetector.finishedScrolling();
-                    onCloseComplete();
-                }
-            });
-            mOpenCloseAnimator.setInterpolator(mSwipeDetector.isIdleState()
-                    ? mFastOutSlowInInterpolator : mScrollInterpolator);
-            mOpenCloseAnimator.start();
-        } else {
-            setTranslationY(mTranslationYClosed);
-            onCloseComplete();
-        }
+        handleClose(animate, DEFAULT_CLOSE_DURATION);
     }
 
-    private void onCloseComplete() {
-        mIsOpen = false;
-        mLauncher.getDragLayer().removeView(mGradientBackground);
-        mLauncher.getDragLayer().removeView(WidgetsBottomSheet.this);
-        mLauncher.getSystemUiController().updateUiState(
-                SystemUiController.UI_STATE_WIDGET_BOTTOM_SHEET, 0);
+    @Override
+    protected void onCloseComplete() {
+        super.onCloseComplete();
+        mLauncher.getDragLayer().removeView(mGradientView);
     }
 
     @Override
@@ -249,83 +181,4 @@ public class WidgetsBottomSheet extends AbstractFloatingView implements Insettab
         setPadding(getPaddingLeft() + leftInset, getPaddingTop(),
                 getPaddingRight() + rightInset, getPaddingBottom() + bottomInset);
     }
-
-    /* SwipeDetector.Listener */
-
-    @Override
-    public void onDragStart(boolean start) {
-    }
-
-    @Override
-    public boolean onDrag(float displacement, float velocity) {
-        setTranslationY(Utilities.boundToRange(displacement, mTranslationYOpen,
-                mTranslationYClosed));
-        return true;
-    }
-
-    @Override
-    public void setTranslationY(float translationY) {
-        super.setTranslationY(translationY);
-        if (mGradientBackground == null) return;
-        float p = (mTranslationYClosed - translationY) / mTranslationYRange;
-        boolean showScrim = p <= 0;
-        mGradientBackground.setProgress(p, showScrim);
-    }
-
-    @Override
-    public void onDragEnd(float velocity, boolean fling) {
-        if ((fling && velocity > 0) || getTranslationY() > (mTranslationYRange) / 2) {
-            mScrollInterpolator.setVelocityAtZero(velocity);
-            mOpenCloseAnimator.setDuration(SwipeDetector.calculateDuration(velocity,
-                    (mTranslationYClosed - getTranslationY()) / mTranslationYRange));
-            close(true);
-        } else {
-            mIsOpen = false;
-            mOpenCloseAnimator.setDuration(SwipeDetector.calculateDuration(velocity,
-                    (getTranslationY() - mTranslationYOpen) / mTranslationYRange));
-            open(true);
-        }
-    }
-
-    @Override
-    public void logActionCommand(int command) {
-        // TODO: be more specific
-        mLauncher.getUserEventDispatcher().logActionCommand(command, ContainerType.WIDGETS);
-    }
-
-    @Override
-    public boolean onControllerTouchEvent(MotionEvent ev) {
-        return mSwipeDetector.onTouchEvent(ev);
-    }
-
-    @Override
-    public boolean onControllerInterceptTouchEvent(MotionEvent ev) {
-        if (ev.getAction() == MotionEvent.ACTION_UP) {
-            // If we got ACTION_UP without ever returning true on intercept,
-            // the user never started dragging the bottom sheet.
-            if (!mLauncher.getDragLayer().isEventOverView(this, ev)) {
-                close(true);
-                return false;
-            }
-        }
-
-        int directionsToDetectScroll = mSwipeDetector.isIdleState() ?
-                SwipeDetector.DIRECTION_NEGATIVE : 0;
-        mSwipeDetector.setDetectableScrollConditions(
-                directionsToDetectScroll, false);
-        mSwipeDetector.onTouchEvent(ev);
-        return mSwipeDetector.isDraggingOrSettling();
-    }
-
-    /* DragListener */
-
-    @Override
-    public void onDragStart(DropTarget.DragObject dragObject, DragOptions options) {
-        // A widget or custom shortcut was dragged.
-        close(true);
-    }
-
-    @Override
-    public void onDragEnd() {
-    }
 }
diff --git a/src/com/android/launcher3/widget/WidgetsContainerView.java b/src/com/android/launcher3/widget/WidgetsContainerView.java
deleted file mode 100644
index 39dd0d498..000000000
--- a/src/com/android/launcher3/widget/WidgetsContainerView.java
+++ /dev/null
@@ -1,243 +0,0 @@
-/*
- * Copyright (C) 2015 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.widget;
-
-import android.content.Context;
-import android.content.pm.LauncherApps;
-import android.graphics.Point;
-import android.support.v7.widget.LinearLayoutManager;
-import android.util.AttributeSet;
-import android.util.Log;
-import android.view.LayoutInflater;
-import android.view.View;
-import android.view.ViewGroup;
-import android.widget.Toast;
-
-import com.android.launcher3.BaseContainerView;
-import com.android.launcher3.DeleteDropTarget;
-import com.android.launcher3.DragSource;
-import com.android.launcher3.DropTarget.DragObject;
-import com.android.launcher3.ItemInfo;
-import com.android.launcher3.Launcher;
-import com.android.launcher3.LauncherAppState;
-import com.android.launcher3.R;
-import com.android.launcher3.Utilities;
-import com.android.launcher3.compat.AlphabeticIndexCompat;
-import com.android.launcher3.dragndrop.DragOptions;
-import com.android.launcher3.folder.Folder;
-import com.android.launcher3.model.PackageItemInfo;
-import com.android.launcher3.model.WidgetItem;
-import com.android.launcher3.userevent.nano.LauncherLogProto.ContainerType;
-import com.android.launcher3.userevent.nano.LauncherLogProto.Target;
-import com.android.launcher3.util.MultiHashMap;
-import com.android.launcher3.util.PackageUserKey;
-import com.android.launcher3.util.Thunk;
-
-import java.util.List;
-
-/**
- * The widgets list view container.
- */
-public class WidgetsContainerView extends BaseContainerView
-        implements View.OnLongClickListener, View.OnClickListener, DragSource {
-    private static final String TAG = "WidgetsContainerView";
-    private static final boolean LOGD = false;
-
-    /* Global instances that are used inside this container. */
-    @Thunk Launcher mLauncher;
-
-    /* Recycler view related member variables */
-    private WidgetsRecyclerView mRecyclerView;
-    private WidgetsListAdapter mAdapter;
-
-    /* Touch handling related member variables. */
-    private Toast mWidgetInstructionToast;
-
-    public WidgetsContainerView(Context context) {
-        this(context, null);
-    }
-
-    public WidgetsContainerView(Context context, AttributeSet attrs) {
-        this(context, attrs, 0);
-    }
-
-    public WidgetsContainerView(Context context, AttributeSet attrs, int defStyleAttr) {
-        super(context, attrs, defStyleAttr);
-        mLauncher = Launcher.getLauncher(context);
-        LauncherAppState apps = LauncherAppState.getInstance(context);
-        mAdapter = new WidgetsListAdapter(context, LayoutInflater.from(context),
-                apps.getWidgetCache(), new AlphabeticIndexCompat(context), this, this,
-                new WidgetsDiffReporter(apps.getIconCache()));
-        mAdapter.setNotifyListener();
-        if (LOGD) {
-            Log.d(TAG, "WidgetsContainerView constructor");
-        }
-    }
-
-    @Override
-    public View getTouchDelegateTargetView() {
-        return mRecyclerView;
-    }
-
-    @Override
-    protected void onFinishInflate() {
-        super.onFinishInflate();
-        mRecyclerView = (WidgetsRecyclerView) getContentView().findViewById(R.id.widgets_list_view);
-        mRecyclerView.setAdapter(mAdapter);
-        mRecyclerView.setLayoutManager(new LinearLayoutManager(getContext()));
-    }
-
-    //
-    // Returns views used for launcher transitions.
-    //
-
-    public void scrollToTop() {
-        mRecyclerView.scrollToPosition(0);
-    }
-
-    //
-    // Touch related handling.
-    //
-
-    @Override
-    public void onClick(View v) {
-        // When we have exited widget tray or are in transition, disregard clicks
-        if (!mLauncher.isWidgetsViewVisible()
-                || mLauncher.getWorkspace().isSwitchingState()
-                || !(v instanceof WidgetCell)) return;
-
-        handleClick();
-    }
-
-    public void handleClick() {
-        // Let the user know that they have to long press to add a widget
-        if (mWidgetInstructionToast != null) {
-            mWidgetInstructionToast.cancel();
-        }
-
-        CharSequence msg = Utilities.wrapForTts(
-                getContext().getText(R.string.long_press_widget_to_add),
-                getContext().getString(R.string.long_accessible_way_to_add));
-        mWidgetInstructionToast = Toast.makeText(getContext(), msg, Toast.LENGTH_SHORT);
-        mWidgetInstructionToast.show();
-    }
-
-    @Override
-    public boolean onLongClick(View v) {
-        // When we have exited the widget tray, disregard long clicks
-        if (!mLauncher.isWidgetsViewVisible()) return false;
-        return handleLongClick(v);
-    }
-
-    public boolean handleLongClick(View v) {
-        if (LOGD) {
-            Log.d(TAG, String.format("onLongClick [v=%s]", v));
-        }
-        // When we  are in transition, disregard long clicks
-        if (mLauncher.getWorkspace().isSwitchingState()) return false;
-        // Return if global dragging is not enabled
-        if (!mLauncher.isDraggingEnabled()) return false;
-
-        return beginDragging(v);
-    }
-
-    private boolean beginDragging(View v) {
-        if (v instanceof WidgetCell) {
-            if (!beginDraggingWidget((WidgetCell) v)) {
-                return false;
-            }
-        } else {
-            Log.e(TAG, "Unexpected dragging view: " + v);
-        }
-
-        // We don't enter spring-loaded mode if the drag has been cancelled
-        if (mLauncher.getDragController().isDragging()) {
-            // Go into spring loaded mode (must happen before we startDrag())
-            mLauncher.enterSpringLoadedDragMode();
-        }
-
-        return true;
-    }
-
-    private boolean beginDraggingWidget(WidgetCell v) {
-        // Get the widget preview as the drag representation
-        WidgetImageView image = (WidgetImageView) v.findViewById(R.id.widget_preview);
-
-        // If the ImageView doesn't have a drawable yet, the widget preview hasn't been loaded and
-        // we abort the drag.
-        if (image.getBitmap() == null) {
-            return false;
-        }
-
-        int[] loc = new int[2];
-        mLauncher.getDragLayer().getLocationInDragLayer(image, loc);
-
-        new PendingItemDragHelper(v).startDrag(
-                image.getBitmapBounds(), image.getBitmap().getWidth(), image.getWidth(),
-                new Point(loc[0], loc[1]), this, new DragOptions());
-        return true;
-    }
-
-    //
-    // Drag related handling methods that implement {@link DragSource} interface.
-    //
-
-    @Override
-    public void onDropCompleted(View target, DragObject d, boolean isFlingToDelete,
-            boolean success) {
-        if (LOGD) {
-            Log.d(TAG, "onDropCompleted");
-        }
-        if (isFlingToDelete || !success || (target != mLauncher.getWorkspace() &&
-                !(target instanceof DeleteDropTarget) && !(target instanceof Folder))) {
-            // Exit spring loaded mode if we have not successfully dropped or have not handled the
-            // drop in Workspace
-            mLauncher.exitSpringLoadedDragModeDelayed(true,
-                    Launcher.EXIT_SPRINGLOADED_MODE_SHORT_TIMEOUT, null);
-        }
-        mLauncher.unlockScreenOrientation(false);
-
-        if (!success) {
-            d.deferDragViewCleanupPostAnimation = false;
-        }
-    }
-
-    /**
-     * Initialize the widget data model.
-     */
-    public void setWidgets(MultiHashMap<PackageItemInfo, WidgetItem> model) {
-        mAdapter.setWidgets(model);
-
-        View loader = getContentView().findViewById(R.id.loader);
-        if (loader != null) {
-            ((ViewGroup) getContentView()).removeView(loader);
-        }
-    }
-
-    public boolean isEmpty() {
-        return mAdapter.getItemCount() == 0;
-    }
-
-    public List<WidgetItem> getWidgetsForPackageUser(PackageUserKey packageUserKey) {
-        return mAdapter.copyWidgetsForPackageUser(packageUserKey);
-    }
-
-    @Override
-    public void fillInLogContainerData(View v, ItemInfo info, Target target, Target targetParent) {
-        targetParent.containerType = ContainerType.WIDGETS;
-    }
-}
\ No newline at end of file
diff --git a/src/com/android/launcher3/widget/WidgetsDiffReporter.java b/src/com/android/launcher3/widget/WidgetsDiffReporter.java
index 52deec32b..d67f40365 100644
--- a/src/com/android/launcher3/widget/WidgetsDiffReporter.java
+++ b/src/com/android/launcher3/widget/WidgetsDiffReporter.java
@@ -16,6 +16,7 @@
 
 package com.android.launcher3.widget;
 
+import android.support.v7.widget.RecyclerView;
 import android.util.Log;
 
 import com.android.launcher3.IconCache;
@@ -26,26 +27,18 @@ import java.util.ArrayList;
 import java.util.Iterator;
 
 /**
- * Do diff on widget's tray list items and call the {@link NotifyListener} methods accordingly.
+ * Do diff on widget's tray list items and call the {@link RecyclerView.Adapter}
+ * methods accordingly.
  */
 public class WidgetsDiffReporter {
-    private final boolean DEBUG = false;
-    private final String TAG = "WidgetsDiffReporter";
-    private final IconCache mIconCache;
-    private NotifyListener mListener;
+    private static final boolean DEBUG = false;
+    private static final String TAG = "WidgetsDiffReporter";
 
-    public interface NotifyListener {
-        void notifyDataSetChanged();
-        void notifyItemChanged(int index);
-        void notifyItemInserted(int index);
-        void notifyItemRemoved(int index);
-    }
+    private final IconCache mIconCache;
+    private final RecyclerView.Adapter mListener;
 
-    public WidgetsDiffReporter(IconCache iconCache) {
+    public WidgetsDiffReporter(IconCache iconCache, RecyclerView.Adapter listener) {
         mIconCache = iconCache;
-    }
-
-    public void setListener(NotifyListener listener) {
         mListener = listener;
     }
 
@@ -55,9 +48,17 @@ public class WidgetsDiffReporter {
             Log.d(TAG, "process oldEntries#=" + currentEntries.size()
                     + " newEntries#=" + newEntries.size());
         }
-        if (currentEntries.size() == 0 && newEntries.size() > 0) {
-            currentEntries.addAll(newEntries);
-            mListener.notifyDataSetChanged();
+        // Early exit if either of the list is empty
+        if (currentEntries.isEmpty() || newEntries.isEmpty()) {
+            // Skip if both list are empty.
+            // On rotation, we open the widget tray with empty. Then try to fetch the list again
+            // when the animation completes (which still gives empty). And we get the final result
+            // when the bind actually completes.
+            if (currentEntries.size() != newEntries.size()) {
+                currentEntries.clear();
+                currentEntries.addAll(newEntries);
+                mListener.notifyDataSetChanged();
+            }
             return;
         }
         ArrayList<WidgetListRowEntry> orgEntries =
diff --git a/src/com/android/launcher3/widget/WidgetsFullSheet.java b/src/com/android/launcher3/widget/WidgetsFullSheet.java
new file mode 100644
index 000000000..72277a253
--- /dev/null
+++ b/src/com/android/launcher3/widget/WidgetsFullSheet.java
@@ -0,0 +1,222 @@
+/*
+ * Copyright (C) 2017 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.widget;
+
+import android.animation.Animator;
+import android.animation.AnimatorListenerAdapter;
+import android.animation.PropertyValuesHolder;
+import android.content.Context;
+import android.graphics.Rect;
+import android.util.AttributeSet;
+import android.view.LayoutInflater;
+import android.view.MotionEvent;
+import android.view.View;
+import android.view.animation.AnimationUtils;
+
+import com.android.launcher3.Insettable;
+import com.android.launcher3.Launcher;
+import com.android.launcher3.LauncherAppState;
+import com.android.launcher3.LauncherAppWidgetHost.ProviderChangedListener;
+import com.android.launcher3.R;
+
+/**
+ * Popup for showing the full list of available widgets
+ */
+public class WidgetsFullSheet extends BaseWidgetSheet
+        implements Insettable, ProviderChangedListener {
+
+    private static final long DEFAULT_OPEN_DURATION = 267;
+    private static final long FADE_IN_DURATION = 150;
+    private static final float VERTICAL_START_POSITION = 0.3f;
+
+    private static final Rect sTempRect = new Rect();
+
+    private final Rect mInsets = new Rect();
+
+    private final WidgetsListAdapter mAdapter;
+
+    private View mNavBarScrim;
+    private WidgetsRecyclerView mRecyclerView;
+
+    public WidgetsFullSheet(Context context, AttributeSet attrs, int defStyleAttr) {
+        super(context, attrs, defStyleAttr);
+        LauncherAppState apps = LauncherAppState.getInstance(context);
+        mAdapter = new WidgetsListAdapter(context,
+                LayoutInflater.from(context), apps.getWidgetCache(), apps.getIconCache(),
+                this, this);
+    }
+
+    public WidgetsFullSheet(Context context, AttributeSet attrs) {
+        this(context, attrs, 0);
+    }
+
+    @Override
+    protected void onFinishInflate() {
+        super.onFinishInflate();
+        mContent = findViewById(R.id.container);
+        mNavBarScrim = findViewById(R.id.nav_bar_bg);
+
+        mRecyclerView = findViewById(R.id.widgets_list_view);
+        mRecyclerView.setAdapter(mAdapter);
+        mAdapter.setApplyBitmapDeferred(true, mRecyclerView);
+
+        mGradientView = findViewById(R.id.gradient_bg);
+        mGradientView.setProgress(1, false);
+
+        onWidgetsBound();
+    }
+
+    @Override
+    protected void onAttachedToWindow() {
+        super.onAttachedToWindow();
+        mLauncher.getAppWidgetHost().addProviderChangeListener(this);
+        notifyWidgetProvidersChanged();
+    }
+
+    @Override
+    protected void onDetachedFromWindow() {
+        super.onDetachedFromWindow();
+        mLauncher.getAppWidgetHost().removeProviderChangeListener(this);
+    }
+
+    @Override
+    public void setInsets(Rect insets) {
+        mInsets.set(insets);
+
+        mNavBarScrim.getLayoutParams().height = insets.bottom;
+        mRecyclerView.setPadding(
+                mRecyclerView.getPaddingLeft(), mRecyclerView.getPaddingTop(),
+                mRecyclerView.getPaddingRight(), insets.bottom);
+        if (insets.bottom > 0) {
+            setupNavBarColor();
+        }
+        requestLayout();
+    }
+
+    @Override
+    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
+        int widthUsed;
+        if (mInsets.bottom > 0) {
+            // If we have bottom insets, we do not show the scrim as it would overlap
+            // with the navbar scrim
+            mGradientView.setVisibility(View.INVISIBLE);
+            widthUsed = 0;
+        } else {
+            mLauncher.getDeviceProfile().getWorkspacePadding(sTempRect);
+            widthUsed = Math.max(sTempRect.left + sTempRect.right,
+                    2 * (mInsets.left + mInsets.right));
+        }
+
+        int heightUsed = mInsets.top + mLauncher.getDeviceProfile().edgeMarginPx;
+        measureChildWithMargins(mContent, widthMeasureSpec,
+                widthUsed, heightMeasureSpec, heightUsed);
+        measureChild(mGradientView, widthMeasureSpec, heightMeasureSpec);
+        setMeasuredDimension(mGradientView.getMeasuredWidth(), mGradientView.getMeasuredHeight());
+    }
+
+    @Override
+    protected void onLayout(boolean changed, int l, int t, int r, int b) {
+        int width = r - l;
+        int height = b - t;
+        mGradientView.layout(0, 0, width, height);
+
+        // Content is laid out as center bottom aligned
+        int contentWidth = mContent.getMeasuredWidth();
+        int contentLeft = (width - contentWidth) / 2;
+        mContent.layout(contentLeft, height - mContent.getMeasuredHeight(),
+                contentLeft + contentWidth, height);
+
+        setTranslationShift(mTranslationShift);
+    }
+
+    @Override
+    public void notifyWidgetProvidersChanged() {
+        mLauncher.refreshAndBindWidgetsForPackageUser(null);
+    }
+
+    @Override
+    protected void onWidgetsBound() {
+        mAdapter.setWidgets(mLauncher.getPopupDataProvider().getAllWidgets());
+    }
+
+    private void open(boolean animate) {
+        if (mIsOpen) {
+            return;
+        }
+        mIsOpen = true;
+        if (animate) {
+            if (mLauncher.getDragLayer().getInsets().bottom > 0) {
+                mContent.setAlpha(0);
+                setTranslationShift(VERTICAL_START_POSITION);
+            }
+            mOpenCloseAnimator.setValues(
+                    PropertyValuesHolder.ofFloat(TRANSLATION_SHIFT, TRANSLATION_SHIFT_OPENED));
+            mOpenCloseAnimator
+                    .setDuration(DEFAULT_OPEN_DURATION)
+                    .setInterpolator(AnimationUtils.loadInterpolator(
+                            getContext(), android.R.interpolator.linear_out_slow_in));
+            mOpenCloseAnimator.addListener(new AnimatorListenerAdapter() {
+                @Override
+                public void onAnimationEnd(Animator animation) {
+                    mRecyclerView.setLayoutFrozen(false);
+                    mAdapter.setApplyBitmapDeferred(false, mRecyclerView);
+                    mOpenCloseAnimator.removeListener(this);
+                }
+            });
+            post(new Runnable() {
+                @Override
+                public void run() {
+                    mRecyclerView.setLayoutFrozen(true);
+                    mOpenCloseAnimator.start();
+                    mContent.animate().alpha(1).setDuration(FADE_IN_DURATION);
+                }
+            });
+        } else {
+            setTranslationShift(TRANSLATION_SHIFT_OPENED);
+            mAdapter.setApplyBitmapDeferred(false, mRecyclerView);
+        }
+    }
+
+    @Override
+    protected void handleClose(boolean animate) {
+        handleClose(animate, DEFAULT_OPEN_DURATION);
+    }
+
+    @Override
+    protected boolean isOfType(int type) {
+        return (type & TYPE_WIDGETS_FULL_SHEET) != 0;
+    }
+
+    @Override
+    public boolean onControllerInterceptTouchEvent(MotionEvent ev) {
+        // Disable swipe down when recycler view is scrolling
+        if (ev.getAction() == MotionEvent.ACTION_DOWN) {
+            mNoIntercept = false;
+            if (mLauncher.getDragLayer().isEventOverView(mContent, ev)) {
+                mNoIntercept = !mRecyclerView.shouldContainerScroll(ev, mLauncher.getDragLayer());
+            }
+        }
+        return super.onControllerInterceptTouchEvent(ev);
+    }
+
+    public static WidgetsFullSheet show(Launcher launcher, boolean animate) {
+        WidgetsFullSheet sheet = (WidgetsFullSheet) launcher.getLayoutInflater()
+                .inflate(R.layout.widgets_full_sheet, launcher.getDragLayer(), false);
+        launcher.getDragLayer().addView(sheet);
+        sheet.open(animate);
+        return sheet;
+    }
+}
diff --git a/src/com/android/launcher3/widget/WidgetsListAdapter.java b/src/com/android/launcher3/widget/WidgetsListAdapter.java
index 6b1800c67..0147ea427 100644
--- a/src/com/android/launcher3/widget/WidgetsListAdapter.java
+++ b/src/com/android/launcher3/widget/WidgetsListAdapter.java
@@ -25,13 +25,11 @@ import android.view.View.OnClickListener;
 import android.view.View.OnLongClickListener;
 import android.view.ViewGroup;
 
+import com.android.launcher3.IconCache;
 import com.android.launcher3.R;
 import com.android.launcher3.WidgetPreviewLoader;
-import com.android.launcher3.compat.AlphabeticIndexCompat;
-import com.android.launcher3.model.PackageItemInfo;
 import com.android.launcher3.model.WidgetItem;
 import com.android.launcher3.util.LabelComparator;
-import com.android.launcher3.util.MultiHashMap;
 import com.android.launcher3.util.PackageUserKey;
 
 import java.util.ArrayList;
@@ -39,7 +37,6 @@ import java.util.Collections;
 import java.util.Comparator;
 import java.util.Iterator;
 import java.util.List;
-import java.util.Map;
 
 /**
  * List view adapter for the widget tray.
@@ -56,7 +53,6 @@ public class WidgetsListAdapter extends Adapter<WidgetsRowViewHolder> {
 
     private final WidgetPreviewLoader mWidgetPreviewLoader;
     private final LayoutInflater mLayoutInflater;
-    private final AlphabeticIndexCompat mIndexer;
 
     private final OnClickListener mIconClickListener;
     private final OnLongClickListener mIconLongClickListener;
@@ -64,56 +60,43 @@ public class WidgetsListAdapter extends Adapter<WidgetsRowViewHolder> {
     private ArrayList<WidgetListRowEntry> mEntries = new ArrayList<>();
     private final WidgetsDiffReporter mDiffReporter;
 
+    private boolean mApplyBitmapDeferred;
+
     public WidgetsListAdapter(Context context, LayoutInflater layoutInflater,
-            WidgetPreviewLoader widgetPreviewLoader, AlphabeticIndexCompat indexCompat,
-            OnClickListener iconClickListener, OnLongClickListener iconLongClickListener,
-            WidgetsDiffReporter diffReporter) {
+            WidgetPreviewLoader widgetPreviewLoader, IconCache iconCache,
+            OnClickListener iconClickListener, OnLongClickListener iconLongClickListener) {
         mLayoutInflater = layoutInflater;
         mWidgetPreviewLoader = widgetPreviewLoader;
-        mIndexer = indexCompat;
         mIconClickListener = iconClickListener;
         mIconLongClickListener = iconLongClickListener;
         mIndent = context.getResources().getDimensionPixelSize(R.dimen.widget_section_indent);
-        mDiffReporter = diffReporter;
+        mDiffReporter = new WidgetsDiffReporter(iconCache, this);
     }
 
-    public void setNotifyListener() {
-        mDiffReporter.setListener(new WidgetsDiffReporter.NotifyListener() {
-            @Override
-            public void notifyDataSetChanged() {
-                WidgetsListAdapter.this.notifyDataSetChanged();
-            }
-
-            @Override
-            public void notifyItemChanged(int index) {
-                WidgetsListAdapter.this.notifyItemChanged(index);
-            }
-
-            @Override
-            public void notifyItemInserted(int index) {
-                WidgetsListAdapter.this.notifyItemInserted(index);
-            }
-
-            @Override
-            public void notifyItemRemoved(int index) {
-                WidgetsListAdapter.this.notifyItemRemoved(index);
+    /**
+     * Defers applying bitmap on all the {@link WidgetCell} in the {@param rv}
+     *
+     * @see WidgetCell#setApplyBitmapDeferred(boolean)
+     */
+    public void setApplyBitmapDeferred(boolean isDeferred, RecyclerView rv) {
+        mApplyBitmapDeferred = isDeferred;
+
+        for (int i = rv.getChildCount() - 1; i >= 0; i--) {
+            WidgetsRowViewHolder holder = (WidgetsRowViewHolder)
+                    rv.getChildViewHolder(rv.getChildAt(i));
+            for (int j = holder.cellContainer.getChildCount() - 1; j >= 0; j--) {
+                View v = holder.cellContainer.getChildAt(j);
+                if (v instanceof WidgetCell) {
+                    ((WidgetCell) v).setApplyBitmapDeferred(mApplyBitmapDeferred);
+                }
             }
-        });
+        }
     }
 
     /**
      * Update the widget list.
      */
-    public void setWidgets(MultiHashMap<PackageItemInfo, WidgetItem> widgets) {
-        ArrayList<WidgetListRowEntry> tempEntries = new ArrayList<>();
-
-        WidgetItemComparator widgetComparator = new WidgetItemComparator();
-        for (Map.Entry<PackageItemInfo, ArrayList<WidgetItem>> entry : widgets.entrySet()) {
-            WidgetListRowEntry row = new WidgetListRowEntry(entry.getKey(), entry.getValue());
-            row.titleSectionName = mIndexer.computeSectionName(row.pkgItem.title);
-            Collections.sort(row.widgets, widgetComparator);
-            tempEntries.add(row);
-        }
+    public void setWidgets(ArrayList<WidgetListRowEntry> tempEntries) {
         WidgetListRowEntryComparator rowComparator = new WidgetListRowEntryComparator();
         Collections.sort(tempEntries, rowComparator);
         mDiffReporter.process(mEntries, tempEntries, rowComparator);
@@ -128,26 +111,6 @@ public class WidgetsListAdapter extends Adapter<WidgetsRowViewHolder> {
         return mEntries.get(pos).titleSectionName;
     }
 
-    /**
-     * Copies and returns the widgets associated with the package and user of the ComponentKey.
-     */
-    public List<WidgetItem> copyWidgetsForPackageUser(PackageUserKey packageUserKey) {
-        for (WidgetListRowEntry entry : mEntries) {
-            if (entry.pkgItem.packageName.equals(packageUserKey.mPackageName)) {
-                ArrayList<WidgetItem> widgets = new ArrayList<>(entry.widgets);
-                // Remove widgets not associated with the correct user.
-                Iterator<WidgetItem> iterator = widgets.iterator();
-                while (iterator.hasNext()) {
-                    if (!iterator.next().user.equals(packageUserKey.mUser)) {
-                        iterator.remove();
-                    }
-                }
-                return widgets.isEmpty() ? null : widgets;
-            }
-        }
-        return null;
-    }
-
     @Override
     public void onBindViewHolder(WidgetsRowViewHolder holder, int pos) {
         WidgetListRowEntry entry = mEntries.get(pos);
@@ -194,6 +157,7 @@ public class WidgetsListAdapter extends Adapter<WidgetsRowViewHolder> {
         for (int i=0; i < infoList.size(); i++) {
             WidgetCell widget = (WidgetCell) row.getChildAt(2*i);
             widget.applyFromCellItem(infoList.get(i), mWidgetPreviewLoader);
+            widget.setApplyBitmapDeferred(mApplyBitmapDeferred);
             widget.ensurePreview();
             widget.setVisibility(View.VISIBLE);
 
@@ -253,5 +217,4 @@ public class WidgetsListAdapter extends Adapter<WidgetsRowViewHolder> {
             return mComparator.compare(a.pkgItem.title.toString(), b.pkgItem.title.toString());
         }
     }
-
 }
diff --git a/src/com/android/launcher3/widget/WidgetsRecyclerView.java b/src/com/android/launcher3/widget/WidgetsRecyclerView.java
index 9730a82aa..89c88a4e7 100644
--- a/src/com/android/launcher3/widget/WidgetsRecyclerView.java
+++ b/src/com/android/launcher3/widget/WidgetsRecyclerView.java
@@ -17,12 +17,12 @@
 package com.android.launcher3.widget;
 
 import android.content.Context;
-import android.graphics.Color;
 import android.support.v7.widget.LinearLayoutManager;
 import android.util.AttributeSet;
 import android.view.View;
 
 import com.android.launcher3.BaseRecyclerView;
+import com.android.launcher3.R;
 
 /**
  * The widgets recycler view.
@@ -32,6 +32,8 @@ public class WidgetsRecyclerView extends BaseRecyclerView {
     private static final String TAG = "WidgetsRecyclerView";
     private WidgetsListAdapter mAdapter;
 
+    private final int mScrollbarTop;
+
     public WidgetsRecyclerView(Context context) {
         this(context, null);
     }
@@ -43,6 +45,7 @@ public class WidgetsRecyclerView extends BaseRecyclerView {
     public WidgetsRecyclerView(Context context, AttributeSet attrs, int defStyleAttr) {
         // API 21 and below only support 3 parameter ctor.
         super(context, attrs, defStyleAttr);
+        mScrollbarTop = getResources().getDimensionPixelSize(R.dimen.dynamic_grid_edge_margin);
     }
 
     public WidgetsRecyclerView(Context context, AttributeSet attrs, int defStyleAttr,
@@ -130,13 +133,16 @@ public class WidgetsRecyclerView extends BaseRecyclerView {
     @Override
     protected int getAvailableScrollHeight() {
         View child = getChildAt(0);
-        int height = child.getMeasuredHeight() * mAdapter.getItemCount();
-        int totalHeight = getPaddingTop() + height + getPaddingBottom();
-        int availableScrollHeight = totalHeight - getScrollbarTrackHeight();
-        return availableScrollHeight;
+        return child.getMeasuredHeight() * mAdapter.getItemCount() - getScrollbarTrackHeight()
+                - mScrollbarTop;
     }
 
     private boolean isModelNotReady() {
         return mAdapter.getItemCount() == 0;
     }
+
+    @Override
+    public int getScrollBarTop() {
+        return mScrollbarTop;
+    }
 }
\ No newline at end of file