diff --git a/quickstep/src/com/android/launcher3/uioverrides/StatusBarTouchController.java b/quickstep/src/com/android/launcher3/uioverrides/StatusBarTouchController.java
new file mode 100644
index 0000000..d5f6b94
--- /dev/null
+++ b/quickstep/src/com/android/launcher3/uioverrides/StatusBarTouchController.java
@@ -0,0 +1,115 @@
+/*
+ * 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 android.view.MotionEvent.ACTION_DOWN;
+import static android.view.MotionEvent.ACTION_MOVE;
+
+import android.os.RemoteException;
+import android.util.Log;
+import android.view.MotionEvent;
+import android.view.ViewConfiguration;
+
+import com.android.launcher3.DeviceProfile;
+import com.android.launcher3.Launcher;
+import com.android.launcher3.LauncherState;
+import com.android.launcher3.touch.TouchEventTranslator;
+import com.android.launcher3.util.TouchController;
+import com.android.quickstep.RecentsModel;
+import com.android.systemui.shared.recents.ISystemUiProxy;
+
+/**
+ * TouchController for handling touch events that get sent to the StatusBar. Once the
+ * Once the event delta y passes the touch slop, the events start getting forwarded.
+ * All events are offset by initial Y value of the pointer.
+ */
+public class StatusBarTouchController implements TouchController {
+
+    private static final String TAG = "StatusBarController";
+
+    protected final Launcher mLauncher;
+    protected final TouchEventTranslator mTranslator;
+    private final float mTouchSlop;
+    private ISystemUiProxy mSysUiProxy;
+
+    /* If {@code false}, this controller should not handle the input {@link MotionEvent}.*/
+    private boolean mCanIntercept;
+
+    public StatusBarTouchController(Launcher l) {
+        mLauncher = l;
+        mTouchSlop = ViewConfiguration.get(l).getScaledTouchSlop();
+        mTranslator = new TouchEventTranslator((MotionEvent ev)-> dispatchTouchEvent(ev));
+    }
+
+    private void dispatchTouchEvent(MotionEvent ev) {
+        try {
+            if (mSysUiProxy != null) {
+                mSysUiProxy.onStatusBarMotionEvent(ev);
+            }
+        } catch (RemoteException e) {
+            Log.e(TAG, "Remote exception on sysUiProxy.", e);
+        }
+    }
+
+    @Override
+    public final boolean onControllerInterceptTouchEvent(MotionEvent ev) {
+        int action = ev.getActionMasked();
+        if (action == ACTION_DOWN) {
+            mCanIntercept = canInterceptTouch(ev);
+            if (!mCanIntercept) {
+                return false;
+            }
+            mTranslator.reset();
+            mTranslator.setDownParameters(0, ev);
+        } else if (ev.getActionMasked() == MotionEvent.ACTION_POINTER_DOWN) {
+            // Check!! should only set it only when threshold is not entered.
+            mTranslator.setDownParameters(ev.getActionIndex(), ev);
+        }
+        if (!mCanIntercept) {
+            return false;
+        }
+        if (action == ACTION_MOVE) {
+            float dy = ev.getY() - mTranslator.getDownY();
+            if (dy > mTouchSlop) {
+                mTranslator.dispatchDownEvents(ev);
+                mTranslator.processMotionEvent(ev);
+                return true;
+            }
+        }
+        return false;
+    }
+
+
+    @Override
+    public final boolean onControllerTouchEvent(MotionEvent ev) {
+        mTranslator.processMotionEvent(ev);
+        return true;
+    }
+
+    private boolean canInterceptTouch(MotionEvent ev) {
+        if (!mLauncher.isInState(LauncherState.NORMAL)) {
+            return false;
+        } else {
+            // For NORMAL state, only listen if the event originated above the navbar height
+            DeviceProfile dp = mLauncher.getDeviceProfile();
+            if (ev.getY() > (mLauncher.getDragLayer().getHeight() - dp.getInsets().bottom)) {
+                return false;
+            }
+        }
+        mSysUiProxy = RecentsModel.INSTANCE.get(mLauncher).getSystemUiProxy();
+        return mSysUiProxy != null;
+    }
+}
diff --git a/quickstep/src/com/android/launcher3/uioverrides/UiFactory.java b/quickstep/src/com/android/launcher3/uioverrides/UiFactory.java
index c939330..5980d85 100644
--- a/quickstep/src/com/android/launcher3/uioverrides/UiFactory.java
+++ b/quickstep/src/com/android/launcher3/uioverrides/UiFactory.java
@@ -42,6 +42,7 @@
 import com.android.launcher3.LauncherStateManager.StateHandler;
 import com.android.launcher3.Utilities;
 import com.android.launcher3.anim.AnimatorPlaybackController;
+import com.android.launcher3.config.FeatureFlags;
 import com.android.launcher3.util.TouchController;
 import com.android.quickstep.OverviewInteractionState;
 import com.android.quickstep.RecentsModel;
@@ -52,6 +53,7 @@
 
 import java.io.ByteArrayOutputStream;
 import java.io.PrintWriter;
+import java.util.ArrayList;
 import java.util.zip.Deflater;
 
 public class UiFactory {
@@ -59,24 +61,25 @@
     public static TouchController[] createTouchControllers(Launcher launcher) {
         boolean swipeUpEnabled = OverviewInteractionState.INSTANCE.get(launcher)
                 .isSwipeUpGestureEnabled();
-        if (!swipeUpEnabled) {
-            return new TouchController[] {
-                    launcher.getDragController(),
-                    new OverviewToAllAppsTouchController(launcher),
-                    new LauncherTaskViewController(launcher)};
+        ArrayList<TouchController> list = new ArrayList<>();
+        list.add(launcher.getDragController());
+
+        if (!swipeUpEnabled || launcher.getDeviceProfile().isVerticalBarLayout()) {
+            list.add(new OverviewToAllAppsTouchController(launcher));
         }
+
         if (launcher.getDeviceProfile().isVerticalBarLayout()) {
-            return new TouchController[] {
-                    launcher.getDragController(),
-                    new OverviewToAllAppsTouchController(launcher),
-                    new LandscapeEdgeSwipeController(launcher),
-                    new LauncherTaskViewController(launcher)};
+            list.add(new LandscapeEdgeSwipeController(launcher));
         } else {
-            return new TouchController[] {
-                    launcher.getDragController(),
-                    new PortraitStatesTouchController(launcher),
-                    new LauncherTaskViewController(launcher)};
+            list.add(new PortraitStatesTouchController(launcher));
         }
+        if (FeatureFlags.PULL_DOWN_STATUS_BAR && Utilities.IS_DEBUG_DEVICE
+                && !launcher.getDeviceProfile().isMultiWindowMode
+                && !launcher.getDeviceProfile().isVerticalBarLayout()) {
+            list.add(new StatusBarTouchController(launcher));
+        }
+        list.add(new LauncherTaskViewController(launcher));
+        return list.toArray(new TouchController[list.size()]);
     }
 
     public static void setOnTouchControllersChangedListener(Context context, Runnable listener) {
diff --git a/res/values/config.xml b/res/values/config.xml
index 2a6b25c..9f97478 100644
--- a/res/values/config.xml
+++ b/res/values/config.xml
@@ -79,27 +79,15 @@
 <!-- Hotseat -->
     <bool name="hotseat_transpose_layout_with_orientation">true</bool>
 
-    <!-- Name of a subclass of com.android.launcher3.AppFilter used to
-         filter the activities shown in the launcher. Can be empty. -->
+    <!-- Various classes overriden by projects/build flavors. -->
     <string name="app_filter_class" translatable="false"></string>
-
-    <!-- Name of an icon provider class. -->
     <string name="icon_provider_class" translatable="false"></string>
-
-    <!-- Name of a drawable factory class. -->
     <string name="drawable_factory_class" translatable="false"></string>
-
-    <!-- Name of a user event dispatcher class. -->
     <string name="user_event_dispatcher_class" translatable="false"></string>
-
-    <!-- Name of an app transition manager class. -->
     <string name="app_transition_manager_class" translatable="false"></string>
-
-    <!-- Name of a subclass of com.android.launcher3.util.InstantAppResolver. Can be empty. -->
     <string name="instant_app_resolver_class" translatable="false"></string>
-
-    <!-- Name of a main process initializer class. -->
     <string name="main_process_initializer_class" translatable="false"></string>
+    <string name="system_shortcut_factory_class" translatable="false"></string>
 
     <!-- Package name of the default wallpaper picker. -->
     <string name="wallpaper_picker_package" translatable="false"></string>
diff --git a/src/com/android/launcher3/config/BaseFlags.java b/src/com/android/launcher3/config/BaseFlags.java
index 05fc33f..b67d35b 100644
--- a/src/com/android/launcher3/config/BaseFlags.java
+++ b/src/com/android/launcher3/config/BaseFlags.java
@@ -36,6 +36,10 @@
 
     // Feature flag to enable moving the QSB on the 0th screen of the workspace.
     public static final boolean QSB_ON_FIRST_SCREEN = true;
+
+    //Feature flag to enable pulling down navigation shade from workspace.
+    public static final boolean PULL_DOWN_STATUS_BAR = true;
+
     // When enabled the all-apps icon is not added to the hotseat.
     public static final boolean NO_ALL_APPS_ICON = true;
 
diff --git a/src/com/android/launcher3/popup/PopupContainerWithArrow.java b/src/com/android/launcher3/popup/PopupContainerWithArrow.java
index 10be925..6877cc4 100644
--- a/src/com/android/launcher3/popup/PopupContainerWithArrow.java
+++ b/src/com/android/launcher3/popup/PopupContainerWithArrow.java
@@ -184,17 +184,10 @@
             return null;
         }
 
-        PopupDataProvider popupDataProvider = launcher.getPopupDataProvider();
-        List<String> shortcutIds = popupDataProvider.getShortcutIdsForItem(itemInfo);
-        List<NotificationKeyData> notificationKeys = popupDataProvider
-                .getNotificationKeysForItem(itemInfo);
-        List<SystemShortcut> systemShortcuts = popupDataProvider
-                .getEnabledSystemShortcutsForItem(itemInfo);
-
         final PopupContainerWithArrow container =
                 (PopupContainerWithArrow) launcher.getLayoutInflater().inflate(
                         R.layout.popup_container, launcher.getDragLayer(), false);
-        container.populateAndShow(icon, shortcutIds, notificationKeys, systemShortcuts);
+        container.populateAndShow(icon, itemInfo, SystemShortcutFactory.INSTANCE.get(launcher));
         return container;
     }
 
@@ -219,6 +212,15 @@
         }
     }
 
+    protected void populateAndShow(
+            BubbleTextView icon, ItemInfo item, SystemShortcutFactory factory) {
+        PopupDataProvider popupDataProvider = mLauncher.getPopupDataProvider();
+        populateAndShow(icon,
+                popupDataProvider.getShortcutIdsForItem(item),
+                popupDataProvider.getNotificationKeysForItem(item),
+                factory.getEnabledShortcuts(mLauncher, item));
+    }
+
     @TargetApi(Build.VERSION_CODES.P)
     protected void populateAndShow(final BubbleTextView originalIcon, final List<String> shortcutIds,
             final List<NotificationKeyData> notificationKeys, List<SystemShortcut> systemShortcuts) {
diff --git a/src/com/android/launcher3/popup/PopupDataProvider.java b/src/com/android/launcher3/popup/PopupDataProvider.java
index 3faec44..4d5a9c6 100644
--- a/src/com/android/launcher3/popup/PopupDataProvider.java
+++ b/src/com/android/launcher3/popup/PopupDataProvider.java
@@ -50,13 +50,6 @@
     private static final boolean LOGD = false;
     private static final String TAG = "PopupDataProvider";
 
-    /** Note that these are in order of priority. */
-    private static final SystemShortcut[] SYSTEM_SHORTCUTS = new SystemShortcut[] {
-            new SystemShortcut.AppInfo(),
-            new SystemShortcut.Widgets(),
-            new SystemShortcut.Install()
-    };
-
     private final Launcher mLauncher;
 
     /** Maps launcher activity components to their list of shortcut ids. */
@@ -192,16 +185,6 @@
                 : notificationListener.getNotificationsForKeys(notificationKeys);
     }
 
-    public @NonNull List<SystemShortcut> getEnabledSystemShortcutsForItem(ItemInfo info) {
-        List<SystemShortcut> systemShortcuts = new ArrayList<>();
-        for (SystemShortcut systemShortcut : SYSTEM_SHORTCUTS) {
-            if (systemShortcut.getOnClickListener(mLauncher, info) != null) {
-                systemShortcuts.add(systemShortcut);
-            }
-        }
-        return systemShortcuts;
-    }
-
     public void cancelNotification(String notificationKey) {
         NotificationListener notificationListener = NotificationListener.getInstanceIfConnected();
         if (notificationListener == null) {
diff --git a/src/com/android/launcher3/popup/SystemShortcutFactory.java b/src/com/android/launcher3/popup/SystemShortcutFactory.java
new file mode 100644
index 0000000..516fafa
--- /dev/null
+++ b/src/com/android/launcher3/popup/SystemShortcutFactory.java
@@ -0,0 +1,57 @@
+/*
+ * 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.popup;
+
+import com.android.launcher3.ItemInfo;
+import com.android.launcher3.Launcher;
+import com.android.launcher3.R;
+import com.android.launcher3.util.MainThreadInitializedObject;
+import com.android.launcher3.util.ResourceBasedOverride;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import androidx.annotation.NonNull;
+
+public class SystemShortcutFactory implements ResourceBasedOverride {
+
+    public static final MainThreadInitializedObject<SystemShortcutFactory> INSTANCE =
+            new MainThreadInitializedObject<>(c -> Overrides.getObject(
+                    SystemShortcutFactory.class, c, R.string.system_shortcut_factory_class));
+
+    /** Note that these are in order of priority. */
+    private final SystemShortcut[] mAllShortcuts;
+
+    @SuppressWarnings("unused")
+    public SystemShortcutFactory() {
+        this(new SystemShortcut.AppInfo(),
+                new SystemShortcut.Widgets(), new SystemShortcut.Install());
+    }
+
+    protected SystemShortcutFactory(SystemShortcut... shortcuts) {
+        mAllShortcuts = shortcuts;
+    }
+
+    public @NonNull List<SystemShortcut> getEnabledShortcuts(Launcher launcher, ItemInfo info) {
+        List<SystemShortcut> systemShortcuts = new ArrayList<>();
+        for (SystemShortcut systemShortcut : mAllShortcuts) {
+            if (systemShortcut.getOnClickListener(launcher, info) != null) {
+                systemShortcuts.add(systemShortcut);
+            }
+        }
+        return systemShortcuts;
+    }
+}
diff --git a/src/com/android/launcher3/touch/AbstractStateChangeTouchController.java b/src/com/android/launcher3/touch/AbstractStateChangeTouchController.java
index fd9157e..7b09bcc 100644
--- a/src/com/android/launcher3/touch/AbstractStateChangeTouchController.java
+++ b/src/com/android/launcher3/touch/AbstractStateChangeTouchController.java
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2019 The Android Open Source Project
+ * 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.
diff --git a/src/com/android/launcher3/touch/TouchEventTranslator.java b/src/com/android/launcher3/touch/TouchEventTranslator.java
new file mode 100644
index 0000000..8a5c932
--- /dev/null
+++ b/src/com/android/launcher3/touch/TouchEventTranslator.java
@@ -0,0 +1,274 @@
+/*
+ * 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.touch;
+
+import android.graphics.PointF;
+import android.util.Log;
+import android.util.Pair;
+import android.util.SparseArray;
+import android.util.SparseLongArray;
+import android.view.MotionEvent;
+import android.view.MotionEvent.PointerCoords;
+import android.view.MotionEvent.PointerProperties;
+
+import com.android.launcher3.Utilities.Consumer;
+
+/**
+ * To minimize the size of the MotionEvent, historic events are not copied and passed via the
+ * listener.
+ */
+public class TouchEventTranslator {
+
+    private static final String TAG = "TouchEventTranslator";
+    private static final boolean DEBUG = false;
+
+    private class DownState {
+        long timeStamp;
+        float downY;
+        public DownState(long timeStamp, float downY) {
+            this.timeStamp = timeStamp;
+            this.downY = downY;
+        }
+    };
+    private final DownState ZERO = new DownState(0, 0f);
+
+    private final Consumer<MotionEvent> mListener;
+
+    private final SparseArray<DownState> mDownEvents;
+    private final SparseArray<PointF> mFingers;
+
+    private final SparseArray<Pair<PointerProperties[], PointerCoords[]>> mCache;
+
+    public TouchEventTranslator(Consumer<MotionEvent> listener) {
+        mDownEvents = new SparseArray<>();
+        mFingers = new SparseArray<>();
+        mCache = new SparseArray<>();
+
+        mListener = listener;
+    }
+
+    public void reset() {
+        mDownEvents.clear();
+        mFingers.clear();
+    }
+
+    public float getDownY() {
+        return mDownEvents.get(0).downY;
+    }
+
+    public void setDownParameters(int idx, MotionEvent e) {
+        DownState ev = new DownState(e.getEventTime(), e.getY(idx));
+        mDownEvents.append(idx, ev);
+    }
+
+    public void dispatchDownEvents(MotionEvent ev) {
+        for(int i = 0; i < ev.getPointerCount() && i < mDownEvents.size(); i++) {
+            int pid = ev.getPointerId(i);
+            put(pid, ev.getX(i), 0, mDownEvents.get(i).timeStamp, ev);
+        }
+    }
+
+    public void processMotionEvent(MotionEvent ev) {
+        if (DEBUG) {
+            printSamples(TAG + " processMotionEvent", ev);
+        }
+        int index = ev.getActionIndex();
+        float x = ev.getX(index);
+        float y = ev.getY(index) - mDownEvents.get(index, ZERO).downY;
+        switch (ev.getActionMasked()) {
+            case MotionEvent.ACTION_POINTER_DOWN:
+                int pid = ev.getPointerId(index);
+                if(mFingers.get(pid, null) != null) {
+                    for(int i=0; i < ev.getPointerCount(); i++) {
+                        pid = ev.getPointerId(i);
+                        position(pid, x, y);
+                    }
+                    generateEvent(ev.getAction(), ev);
+                } else {
+                    put(pid, x, y, ev);
+                }
+                break;
+            case MotionEvent.ACTION_MOVE:
+                for(int i=0; i < ev.getPointerCount(); i++) {
+                    pid = ev.getPointerId(i);
+                    position(pid, x, y);
+                }
+                generateEvent(ev.getAction(), ev);
+                break;
+            case MotionEvent.ACTION_POINTER_UP:
+            case MotionEvent.ACTION_UP:
+                pid = ev.getPointerId(index);
+                lift(pid, index, x, y, ev);
+                break;
+            case MotionEvent.ACTION_CANCEL:
+                cancel(ev);
+                break;
+            default:
+                Log.v(TAG, "Didn't process ");
+                printSamples(TAG, ev);
+
+        }
+    }
+
+    private TouchEventTranslator put(int id, float x, float y, MotionEvent ev) {
+        return put(id, x, y, ev.getEventTime(), ev);
+    }
+
+    private TouchEventTranslator put(int id, float x, float y, long ms, MotionEvent ev) {
+        checkFingerExistence(id, false);
+        boolean isInitialDown = (mFingers.size() == 0);
+
+        mFingers.put(id, new PointF(x, y));
+        int n = mFingers.size();
+
+        if (mCache.get(n) == null) {
+            PointerProperties[] properties = new PointerProperties[n];
+            PointerCoords[] coords = new PointerCoords[n];
+            for (int i = 0; i < n; i++) {
+                properties[i] = new PointerProperties();
+                coords[i] = new PointerCoords();
+            }
+            mCache.put(n, new Pair(properties, coords));
+        }
+
+        int action;
+        if (isInitialDown) {
+            action = MotionEvent.ACTION_DOWN;
+        } else {
+            action = MotionEvent.ACTION_POINTER_DOWN;
+            // Set the id of the changed pointer.
+            action |= id << MotionEvent.ACTION_POINTER_INDEX_SHIFT;
+        }
+        generateEvent(action, ms, ev);
+        return this;
+    }
+
+    public TouchEventTranslator position(int id, float x, float y) {
+        checkFingerExistence(id, true);
+        mFingers.get(id).set(x, y);
+        return this;
+    }
+
+    private TouchEventTranslator lift(int id, int index, MotionEvent ev) {
+        checkFingerExistence(id, true);
+        boolean isFinalUp = (mFingers.size() == 1);
+        int action;
+        if (isFinalUp) {
+            action = MotionEvent.ACTION_UP;
+        } else {
+            action = MotionEvent.ACTION_POINTER_UP;
+            // Set the id of the changed pointer.
+            action |= index << MotionEvent.ACTION_POINTER_INDEX_SHIFT;
+        }
+        generateEvent(action, ev);
+        mFingers.remove(id);
+        return this;
+    }
+
+    private TouchEventTranslator lift(int id, int index, float x, float y, MotionEvent ev) {
+        checkFingerExistence(id, true);
+        mFingers.get(id).set(x, y);
+        return lift(id, index, ev);
+    }
+
+    public TouchEventTranslator cancel(MotionEvent ev) {
+        generateEvent(MotionEvent.ACTION_CANCEL, ev);
+        mFingers.clear();
+        return this;
+    }
+
+    private void checkFingerExistence(int id, boolean shouldExist) {
+        if (shouldExist != (mFingers.get(id, null) != null)) {
+            throw new IllegalArgumentException(
+                    shouldExist ? "Finger does not exist" : "Finger already exists");
+        }
+    }
+
+
+    /**
+     * Used to debug MotionEvents being sent/received.
+     */
+    public void printSamples(String msg, MotionEvent ev) {
+        System.out.printf("%s %s", msg, MotionEvent.actionToString(ev.getActionMasked()));
+        final int pointerCount = ev.getPointerCount();
+        System.out.printf("#%d/%d", ev.getPointerId(ev.getActionIndex()), pointerCount);
+        System.out.printf(" t=%d:", ev.getEventTime());
+        for (int p = 0; p < pointerCount; p++) {
+            System.out.printf("  id=%d: (%f,%f)",
+                    ev.getPointerId(p), ev.getX(p), ev.getY(p));
+        }
+        System.out.println();
+    }
+
+    private void generateEvent(int action, MotionEvent ev) {
+        generateEvent(action, ev.getEventTime(), ev);
+    }
+
+    private void generateEvent(int action, long ms, MotionEvent ev) {
+        Pair<PointerProperties[], PointerCoords[]> state = getFingerState();
+        MotionEvent event = MotionEvent.obtain(
+                mDownEvents.get(0).timeStamp,
+                ms,
+                action,
+                state.first.length,
+                state.first,
+                state.second,
+                ev.getMetaState(),
+                ev.getButtonState() /* buttonState */,
+                ev.getXPrecision() /* xPrecision */,
+                ev.getYPrecision() /* yPrecision */,
+                ev.getDeviceId(),
+                ev.getEdgeFlags(),
+                ev.getSource(),
+                ev.getFlags() /* flags */);
+        if (DEBUG) {
+            printSamples(TAG + " generateEvent", event);
+        }
+        mListener.accept(event);
+        event.recycle();
+    }
+
+    /**
+     * Returns the description of the fingers' state expected by MotionEvent.
+     */
+    private Pair<PointerProperties[], PointerCoords[]> getFingerState() {
+        int nFingers = mFingers.size();
+
+        Pair<PointerProperties[], PointerCoords[]> result = mCache.get(nFingers);
+        PointerProperties[] properties = result.first;
+        PointerCoords[] coordinates = result.second;
+
+        int index = 0;
+        for (int i = 0; i < mFingers.size(); i++) {
+            int id = mFingers.keyAt(i);
+            PointF location = mFingers.get(id);
+
+            PointerProperties property = properties[i];
+            property.id = id;
+            property.toolType = MotionEvent.TOOL_TYPE_FINGER;
+            properties[index] = property;
+
+            PointerCoords coordinate = coordinates[i];
+            coordinate.x = location.x;
+            coordinate.y = location.y;
+            coordinate.pressure = 1.0f;
+            coordinates[index] = coordinate;
+
+            index++;
+        }
+        return mCache.get(nFingers);
+    }
+}
diff --git a/src/com/android/launcher3/util/FlagOp.java b/src/com/android/launcher3/util/FlagOp.java
index 5e26ed1..a012c86 100644
--- a/src/com/android/launcher3/util/FlagOp.java
+++ b/src/com/android/launcher3/util/FlagOp.java
@@ -1,30 +1,16 @@
 package com.android.launcher3.util;
 
-public abstract class FlagOp {
+public interface FlagOp {
 
-    public static FlagOp NO_OP = new FlagOp() {};
+    FlagOp NO_OP = i -> i;
 
-    private FlagOp() {}
+    int apply(int flags);
 
-    public int apply(int flags) {
-        return flags;
+    static FlagOp addFlag(int flag) {
+        return i -> i + flag;
     }
 
-    public static FlagOp addFlag(final int flag) {
-        return new FlagOp() {
-            @Override
-            public int apply(int flags) {
-                return flags | flag;
-            }
-        };
-    }
-
-    public static FlagOp removeFlag(final int flag) {
-        return new FlagOp() {
-            @Override
-            public int apply(int flags) {
-                return flags & ~flag;
-            }
-        };
+    static FlagOp removeFlag(int flag) {
+        return i -> i & ~flag;
     }
 }