Merge "New spring overscroll in pagedView" into sc-dev

quickstep/src/com/android/quickstep/AbsSwipeUpHandler.java

@@ -71,6 +71,7 @@ import android.view.MotionEvent;
 import android.view.View;
 import android.view.View.OnApplyWindowInsetsListener;
 import android.view.ViewTreeObserver.OnDrawListener;
+import android.view.ViewTreeObserver.OnScrollChangedListener;
 import android.view.WindowInsets;
 import android.view.animation.Interpolator;
 import android.widget.Toast;
@@ -139,6 +140,8 @@ public abstract class AbsSwipeUpHandler<T extends StatefulActivity<S>,
     private final Handler mHandler = new Handler();
     // Callbacks to be made once the recents animation starts
     private final ArrayList<Runnable> mRecentsAnimationStartCallbacks = new ArrayList<>();
+    private final OnScrollChangedListener mOnRecentsScrollListener = this::onRecentsViewScroll;
+
     protected RecentsAnimationController mRecentsAnimationController;
     protected RecentsAnimationTargets mRecentsAnimationTargets;
     protected T mActivity;
@@ -1368,6 +1371,7 @@ public abstract class AbsSwipeUpHandler<T extends StatefulActivity<S>,
     private void invalidateHandlerWithLauncher() {
         endLauncherTransitionController();
 
+        mRecentsView.removeOnScrollChangedListener(mOnRecentsScrollListener);
         mRecentsView.onGestureAnimationEnd();
         resetLauncherListeners();
     }
@@ -1562,17 +1566,19 @@ public abstract class AbsSwipeUpHandler<T extends StatefulActivity<S>,
                     mRecentsAnimationTargets.addReleaseCheck(applier));
         });
 
-        mRecentsView.setOnScrollChangeListener((v, scrollX, scrollY, oldScrollX, oldScrollY) -> {
-            if (moveWindowWithRecentsScroll()) {
-                updateFinalShift();
-            }
-        });
+        mRecentsView.addOnScrollChangedListener(mOnRecentsScrollListener);
         runOnRecentsAnimationStart(() ->
                 mRecentsView.setRecentsAnimationTargets(mRecentsAnimationController,
                         mRecentsAnimationTargets));
         mRecentsViewScrollLinked = true;
     }
 
+    private void onRecentsViewScroll() {
+        if (moveWindowWithRecentsScroll()) {
+            updateFinalShift();
+        }
+    }
+
     protected void startNewTask(Consumer<Boolean> resultCallback) {
         // Launch the task user scrolled to (mRecentsView.getNextPage()).
         if (!mCanceled) {

quickstep/src/com/android/quickstep/views/RecentsView.java

@@ -42,6 +42,7 @@ import static com.android.launcher3.logging.StatsLogManager.LauncherEvent.LAUNCH
 import static com.android.launcher3.logging.StatsLogManager.LauncherEvent.LAUNCHER_TASK_DISMISS_SWIPE_UP;
 import static com.android.launcher3.logging.StatsLogManager.LauncherEvent.LAUNCHER_TASK_LAUNCH_SWIPE_DOWN;
 import static com.android.launcher3.statehandlers.DepthController.DEPTH;
+import static com.android.launcher3.touch.PagedOrientationHandler.CANVAS_TRANSLATE;
 import static com.android.launcher3.util.Executors.MAIN_EXECUTOR;
 import static com.android.launcher3.util.Executors.UI_HELPER_EXECUTOR;
 import static com.android.launcher3.util.SystemUiController.UI_STATE_OVERVIEW;
@@ -88,11 +89,13 @@ import android.view.MotionEvent;
 import android.view.View;
 import android.view.ViewDebug;
 import android.view.ViewGroup;
+import android.view.ViewTreeObserver.OnScrollChangedListener;
 import android.view.accessibility.AccessibilityEvent;
 import android.view.accessibility.AccessibilityNodeInfo;
 import android.view.animation.Interpolator;
 import android.widget.FrameLayout;
 import android.widget.ListView;
+import android.widget.OverScroller;
 
 import androidx.annotation.Nullable;
 import androidx.annotation.UiThread;
@@ -116,14 +119,15 @@ import com.android.launcher3.statehandlers.DepthController;
 import com.android.launcher3.statemanager.BaseState;
 import com.android.launcher3.statemanager.StatefulActivity;
 import com.android.launcher3.testing.TestProtocol;
+import com.android.launcher3.touch.OverScroll;
 import com.android.launcher3.touch.PagedOrientationHandler;
 import com.android.launcher3.util.DynamicResource;
 import com.android.launcher3.util.IntSet;
 import com.android.launcher3.util.MultiValueAlpha;
-import com.android.launcher3.util.OverScroller;
 import com.android.launcher3.util.ResourceBasedOverride.Overrides;
 import com.android.launcher3.util.SplitConfigurationOptions.SplitPositionOption;
 import com.android.launcher3.util.Themes;
+import com.android.launcher3.util.TranslateEdgeEffect;
 import com.android.launcher3.util.ViewPool;
 import com.android.quickstep.AnimatedFloat;
 import com.android.quickstep.BaseActivityInterface;
@@ -157,6 +161,7 @@ import com.android.systemui.shared.system.TaskStackChangeListeners;
 import com.android.wm.shell.pip.IPipAnimationListener;
 
 import java.util.ArrayList;
+import java.util.List;
 import java.util.function.Consumer;
 
 /**
@@ -296,6 +301,9 @@ public abstract class RecentsView<ACTIVITY_TYPE extends StatefulActivity<STATE_T
                 }
             };
 
+    // OverScroll constants
+    private static final int OVERSCROLL_PAGE_SNAP_ANIMATION_DURATION = 270;
+
     protected final RecentsOrientedState mOrientationState;
     protected final BaseActivityInterface<STATE_TYPE, ACTIVITY_TYPE> mSizeStrategy;
     protected RecentsAnimationController mRecentsAnimationController;
@@ -314,6 +322,8 @@ public abstract class RecentsView<ACTIVITY_TYPE extends StatefulActivity<STATE_T
     protected final Rect mTempRect = new Rect();
     protected final RectF mTempRectF = new RectF();
     private final PointF mTempPointF = new PointF();
+    private final float[] mTempFloat = new float[1];
+    private final List<OnScrollChangedListener> mScrollListeners = new ArrayList<>();
     private float mFullscreenScale;
 
     private static final int DISMISS_TASK_DURATION = 300;
@@ -360,6 +370,9 @@ public abstract class RecentsView<ACTIVITY_TYPE extends StatefulActivity<STATE_T
 
     IntSet mTopIdSet = new IntSet();
 
+    private int mOverScrollShift = 0;
+
+
     /**
      * TODO: Call reloadIdNeeded in onTaskStackChanged.
      */
@@ -583,6 +596,72 @@ public abstract class RecentsView<ACTIVITY_TYPE extends StatefulActivity<STATE_T
         return mIsRtl;
     }
 
+    @Override
+    protected void initEdgeEffect() {
+        mEdgeGlowLeft = new TranslateEdgeEffect(getContext());
+        mEdgeGlowRight = new TranslateEdgeEffect(getContext());
+    }
+
+    @Override
+    protected void drawEdgeEffect(Canvas canvas) {
+        // Do not draw edge effect
+    }
+
+    @Override
+    protected void dispatchDraw(Canvas canvas) {
+        // Draw overscroll
+        if (mAllowOverScroll && (!mEdgeGlowRight.isFinished() || !mEdgeGlowLeft.isFinished())) {
+            final int restoreCount = canvas.save();
+            final int width = getWidth();
+            final int height = getHeight();
+            int primarySize = mOrientationHandler.getPrimaryValue(width, height);
+            int secondarySize = mOrientationHandler.getSecondaryValue(width, height);
+
+            float effectiveShift = 0;
+            if (!mEdgeGlowLeft.isFinished()) {
+                mEdgeGlowLeft.setSize(secondarySize, primarySize);
+                if (((TranslateEdgeEffect) mEdgeGlowLeft).getTranslationShift(mTempFloat)) {
+                    effectiveShift = mTempFloat[0];
+                    postInvalidateOnAnimation();
+                }
+            }
+            if (!mEdgeGlowRight.isFinished()) {
+                mEdgeGlowRight.setSize(secondarySize, primarySize);
+                if (((TranslateEdgeEffect) mEdgeGlowRight).getTranslationShift(mTempFloat)) {
+                    effectiveShift -= mTempFloat[0];
+                    postInvalidateOnAnimation();
+                }
+            }
+
+            int scroll = OverScroll.dampedScroll(effectiveShift * primarySize, primarySize);
+            mOrientationHandler.set(canvas, CANVAS_TRANSLATE, scroll);
+
+            if (mOverScrollShift != scroll) {
+                mOverScrollShift = scroll;
+                dispatchScrollChanged();
+            }
+
+            super.dispatchDraw(canvas);
+            canvas.restoreToCount(restoreCount);
+        } else {
+            if (mOverScrollShift != 0) {
+                mOverScrollShift = 0;
+                dispatchScrollChanged();
+            }
+            super.dispatchDraw(canvas);
+        }
+        if (LIVE_TILE.get() && mEnableDrawingLiveTile && mLiveTileParams.getTargetSet() != null) {
+            redrawLiveTile();
+        }
+    }
+
+    /**
+     * Returns the view shift due to overscroll
+     */
+    public int getOverScrollShift() {
+        return mOverScrollShift;
+    }
+
     @Override
     public Task onTaskThumbnailChanged(int taskId, ThumbnailData thumbnailData) {
         if (mHandleTaskStackChanges) {
@@ -936,8 +1015,30 @@ public abstract class RecentsView<ACTIVITY_TYPE extends StatefulActivity<STATE_T
     }
 
     @Override
-    protected boolean snapToPageInFreeScroll() {
-        return !showAsGrid();
+    protected void onNotSnappingToPageInFreeScroll() {
+        int finalPos = mScroller.getFinalX();
+        if (!showAsGrid() && finalPos > mMinScroll && finalPos < mMaxScroll) {
+            int firstPageScroll = getScrollForPage(!mIsRtl ? 0 : getPageCount() - 1);
+            int lastPageScroll = getScrollForPage(!mIsRtl ? getPageCount() - 1 : 0);
+
+            // If scrolling ends in the half of the added space that is closer to
+            // the end, settle to the end. Otherwise snap to the nearest page.
+            // If flinging past one of the ends, don't change the velocity as it
+            // will get stopped at the end anyway.
+            int pageSnapped = finalPos < (firstPageScroll + mMinScroll) / 2
+                    ? mMinScroll
+                    : finalPos > (lastPageScroll + mMaxScroll) / 2
+                            ? mMaxScroll
+                            : getScrollForPage(mNextPage);
+
+            mScroller.setFinalX(pageSnapped);
+            // Ensure the scroll/snap doesn't happen too fast;
+            int extraScrollDuration = OVERSCROLL_PAGE_SNAP_ANIMATION_DURATION
+                    - mScroller.getDuration();
+            if (extraScrollDuration > 0) {
+                mScroller.extendDuration(extraScrollDuration);
+            }
+        }
     }
 
     @Override
@@ -1267,12 +1368,6 @@ public abstract class RecentsView<ACTIVITY_TYPE extends StatefulActivity<STATE_T
 
         // Update the high res thumbnail loader state
         mModel.getThumbnailCache().getHighResLoadingState().setFlingingFast(isFlingingFast);
-
-        mLiveTileTaskViewSimulator.setScroll(getScrollOffset());
-        if (LIVE_TILE.get() && mEnableDrawingLiveTile
-                && mLiveTileParams.getTargetSet() != null) {
-            redrawLiveTile();
-        }
         return scrolling;
     }
 
@@ -1571,7 +1666,6 @@ public abstract class RecentsView<ACTIVITY_TYPE extends StatefulActivity<STATE_T
             updateOrientationHandler();
         }
 
-        setOnScrollChangeListener(null);
         setEnableFreeScroll(true);
         setEnableDrawingLiveTile(true);
         if (!LIVE_TILE.get()) {
@@ -3207,13 +3301,6 @@ public abstract class RecentsView<ACTIVITY_TYPE extends StatefulActivity<STATE_T
         return mClearAllButton;
     }
 
-    @Override
-    protected boolean onOverscroll(int amount) {
-        // overscroll should only be accepted on -1 direction (for clear all button)
-        if ((amount > 0 && !mIsRtl) || (amount < 0 && mIsRtl)) return false;
-        return super.onOverscroll(amount);
-    }
-
     /**
      * @return How many pixels the running task is offset on the currently laid out dominant axis.
      */
@@ -3228,14 +3315,8 @@ public abstract class RecentsView<ACTIVITY_TYPE extends StatefulActivity<STATE_T
         if (pageIndex == -1) {
             return 0;
         }
-        // Unbound the scroll (due to overscroll) if the adjacent tasks are offset away from it.
-        // This allows the page to move freely, given there's no visual indication why it shouldn't.
-        int boundedScroll = mOrientationHandler.getPrimaryScroll(this);
-        int unboundedScroll = getUnboundedScroll();
-        float unboundedProgress = mAdjacentPageOffset;
-        int scroll = Math.round(unboundedScroll * unboundedProgress
-                + boundedScroll * (1 - unboundedProgress));
-        return getScrollForPage(pageIndex) - scroll;
+        return getScrollForPage(pageIndex) - mOrientationHandler.getPrimaryScroll(this)
+                + getOverScrollShift();
     }
 
     /**
@@ -3421,6 +3502,33 @@ public abstract class RecentsView<ACTIVITY_TYPE extends StatefulActivity<STATE_T
         void onEmptyMessageUpdated(boolean isEmpty);
     }
 
+    /**
+     * Adds a listener for scroll changes
+     */
+    public void addOnScrollChangedListener(OnScrollChangedListener listener) {
+        mScrollListeners.add(listener);
+    }
+
+    /**
+     * Removes a previously added scroll change listener
+     */
+    public void removeOnScrollChangedListener(OnScrollChangedListener listener) {
+        mScrollListeners.remove(listener);
+    }
+
+    @Override
+    protected void onScrollChanged(int l, int t, int oldl, int oldt) {
+        super.onScrollChanged(l, t, oldl, oldt);
+        dispatchScrollChanged();
+    }
+
+    private void dispatchScrollChanged() {
+        mLiveTileTaskViewSimulator.setScroll(getScrollOffset());
+        for (int i = mScrollListeners.size() - 1; i >= 0; i--) {
+            mScrollListeners.get(i).onScrollChanged();
+        }
+    }
+
     private static class PinnedStackAnimationListener<T extends BaseActivity> extends
             IPipAnimationListener.Stub {
         private T mActivity;

quickstep/src/com/android/quickstep/views/TaskMenuView.java

@@ -121,7 +121,7 @@ public class TaskMenuView extends AbstractFloatingView implements OnScrollChange
         };
     }
 
-    private void setPosition(float x, float y) {
+    private void setPosition(float x, float y, int overscrollShift) {
         PagedOrientationHandler pagedOrientationHandler = mTaskView.getPagedOrientationHandler();
         int taskTopMargin = mActivity.getDeviceProfile().overviewTaskThumbnailTopMarginPx;
         float adjustedY = y + taskTopMargin;
@@ -136,8 +136,9 @@ public class TaskMenuView extends AbstractFloatingView implements OnScrollChange
             setPivotY(0);
         }
         setRotation(pagedOrientationHandler.getDegreesRotated());
-        setX(pagedOrientationHandler.getTaskMenuX(x, mTaskView.getThumbnail()));
-        setY(pagedOrientationHandler.getTaskMenuY(adjustedY, mTaskView.getThumbnail()));
+        setX(pagedOrientationHandler.getTaskMenuX(x, mTaskView.getThumbnail(), overscrollShift));
+        setY(pagedOrientationHandler.getTaskMenuY(
+                adjustedY, mTaskView.getThumbnail(), overscrollShift));
     }
 
     public void onRotationChanged() {
@@ -169,14 +170,15 @@ public class TaskMenuView extends AbstractFloatingView implements OnScrollChange
             return false;
         }
         post(this::animateOpen);
-        mActivity.getRootView().getViewTreeObserver().addOnScrollChangedListener(this);
+        ((RecentsView) mActivity.getOverviewPanel()).addOnScrollChangedListener(this);
         return true;
     }
 
     @Override
     public void onScrollChanged() {
         RecentsView rv = mTaskView.getRecentsView();
-        setPosition(mTaskView.getX() - rv.getScrollX(), mTaskView.getY() - rv.getScrollY());
+        setPosition(mTaskView.getX() - rv.getScrollX(), mTaskView.getY() - rv.getScrollY(),
+                rv.getOverScrollShift());
     }
 
     /** @return true if successfully able to populate task view menu, false otherwise */
@@ -236,7 +238,7 @@ public class TaskMenuView extends AbstractFloatingView implements OnScrollChange
             .mOrientationState.isRecentsActivityRotationAllowed();
         mOptionLayout.setOrientation(orientationHandler
                 .getTaskMenuLayoutOrientation(canActivityRotate, mOptionLayout));
-        setPosition(sTempRect.left - insets.left, sTempRect.top - insets.top);
+        setPosition(sTempRect.left - insets.left, sTempRect.top - insets.top, 0);
     }
 
     private void animateOpen() {
@@ -282,7 +284,7 @@ public class TaskMenuView extends AbstractFloatingView implements OnScrollChange
     private void closeComplete() {
         mIsOpen = false;
         mActivity.getDragLayer().removeView(this);
-        mActivity.getRootView().getViewTreeObserver().removeOnScrollChangedListener(this);
+        ((RecentsView) mActivity.getOverviewPanel()).removeOnScrollChangedListener(this);
     }
 
     private RoundedRectRevealOutlineProvider createOpenCloseOutlineProvider() {

src/com/android/launcher3/PagedView.java

@@ -16,16 +16,14 @@
 
 package com.android.launcher3;
 
+import static com.android.launcher3.anim.Interpolators.SCROLL;
 import static com.android.launcher3.compat.AccessibilityManagerCompat.isAccessibilityEnabled;
 import static com.android.launcher3.compat.AccessibilityManagerCompat.isObservedEventType;
-import static com.android.launcher3.config.FeatureFlags.QUICKSTEP_SPRINGS;
 import static com.android.launcher3.touch.OverScroll.OVERSCROLL_DAMP_FACTOR;
-import static com.android.launcher3.touch.PagedOrientationHandler.CANVAS_TRANSLATE;
 import static com.android.launcher3.touch.PagedOrientationHandler.VIEW_SCROLL_BY;
 import static com.android.launcher3.touch.PagedOrientationHandler.VIEW_SCROLL_TO;
 
 import android.animation.LayoutTransition;
-import android.animation.TimeInterpolator;
 import android.annotation.SuppressLint;
 import android.content.Context;
 import android.content.res.TypedArray;
@@ -46,19 +44,17 @@ import android.view.ViewGroup;
 import android.view.ViewParent;
 import android.view.accessibility.AccessibilityEvent;
 import android.view.accessibility.AccessibilityNodeInfo;
-import android.view.animation.Interpolator;
+import android.widget.OverScroller;
 import android.widget.ScrollView;
 
 import androidx.annotation.Nullable;
 
-import com.android.launcher3.anim.Interpolators;
 import com.android.launcher3.compat.AccessibilityManagerCompat;
 import com.android.launcher3.config.FeatureFlags;
 import com.android.launcher3.pageindicators.PageIndicator;
-import com.android.launcher3.touch.OverScroll;
 import com.android.launcher3.touch.PagedOrientationHandler;
 import com.android.launcher3.touch.PagedOrientationHandler.ChildBounds;
-import com.android.launcher3.util.OverScroller;
+import com.android.launcher3.util.EdgeEffectCompat;
 import com.android.launcher3.util.Thunk;
 import com.android.launcher3.views.ActivityContext;
 
@@ -80,9 +76,6 @@ public abstract class PagedView<T extends View & PageIndicator> extends ViewGrou
 
     public static final int PAGE_SNAP_ANIMATION_DURATION = 750;
 
-    // OverScroll constants
-    private final static int OVERSCROLL_PAGE_SNAP_ANIMATION_DURATION = 270;
-
     private static final float RETURN_TO_ORIGINAL_PAGE_THRESHOLD = 0.33f;
     // The page is moved more than halfway, automatically move to the next page on touch up.
     private static final float SIGNIFICANT_MOVE_THRESHOLD = 0.4f;
@@ -113,7 +106,6 @@ public abstract class PagedView<T extends View & PageIndicator> extends ViewGrou
     protected int mMaxScroll;
     protected int mMinScroll;
     protected OverScroller mScroller;
-    private Interpolator mDefaultInterpolator;
     private VelocityTracker mVelocityTracker;
     protected int mPageSpacing = 0;
 
@@ -144,12 +136,6 @@ public abstract class PagedView<T extends View & PageIndicator> extends ViewGrou
     protected boolean mIsPageInTransition = false;
     private Runnable mOnPageTransitionEndCallback;
 
-    protected float mSpringOverScroll;
-
-    protected boolean mWasInOverscroll = false;
-
-    protected int mUnboundedScroll;
-
     // Page Indicator
     @Thunk int mPageIndicatorViewId;
     protected T mPageIndicator;
@@ -162,6 +148,9 @@ public abstract class PagedView<T extends View & PageIndicator> extends ViewGrou
 
     private int[] mTmpIntPair = new int[2];
 
+    protected EdgeEffectCompat mEdgeGlowLeft;
+    protected EdgeEffectCompat mEdgeGlowRight;
+
     public PagedView(Context context) {
         this(context, null);
     }
@@ -181,8 +170,7 @@ public abstract class PagedView<T extends View & PageIndicator> extends ViewGrou
         setHapticFeedbackEnabled(false);
         mIsRtl = Utilities.isRtl(getResources());
 
-        mScroller = new OverScroller(context);
-        setDefaultInterpolator(Interpolators.SCROLL);
+        mScroller = new OverScroller(context, SCROLL);
         mCurrentPage = 0;
 
         final ViewConfiguration configuration = ViewConfiguration.get(context);
@@ -196,12 +184,14 @@ public abstract class PagedView<T extends View & PageIndicator> extends ViewGrou
         mMinFlingVelocity = (int) (MIN_FLING_VELOCITY * density);
         mMinSnapVelocity = (int) (MIN_SNAP_VELOCITY * density);
 
+        initEdgeEffect();
         setDefaultFocusHighlightEnabled(false);
+        setWillNotDraw(false);
     }
 
-    protected void setDefaultInterpolator(Interpolator interpolator) {
-        mDefaultInterpolator = interpolator;
-        mScroller.setInterpolator(mDefaultInterpolator);
+    protected void initEdgeEffect() {
+        mEdgeGlowLeft = new EdgeEffectCompat(getContext());
+        mEdgeGlowRight = new EdgeEffectCompat(getContext());
     }
 
     public void initParentViews(View parent) {
@@ -256,7 +246,7 @@ public abstract class PagedView<T extends View & PageIndicator> extends ViewGrou
             newPosition = getScrollForPage(mCurrentPage);
         }
         mOrientationHandler.set(this, VIEW_SCROLL_TO, newPosition);
-        mOrientationHandler.scrollerStartScroll(mScroller, newPosition);
+        mScroller.startScroll(mScroller.getCurrX(), 0, newPosition - mScroller.getCurrX(), 0);
         forceFinishScroller(true);
     }
 
@@ -420,7 +410,6 @@ public abstract class PagedView<T extends View & PageIndicator> extends ViewGrou
      * to provide custom behavior during animation.
      */
     protected void onPageEndTransition() {
-        mWasInOverscroll = false;
         AccessibilityManagerCompat.sendScrollFinishedEventToTest(getContext());
         AccessibilityManagerCompat.sendCustomAccessibilityEvent(getPageAt(mCurrentPage),
                 AccessibilityEvent.TYPE_VIEW_FOCUSED, null);
@@ -442,56 +431,12 @@ public abstract class PagedView<T extends View & PageIndicator> extends ViewGrou
         }
     }
 
-    protected int getUnboundedScroll() {
-        return mUnboundedScroll;
-    }
-
-    @Override
-    public void scrollBy(int x, int y) {
-        mOrientationHandler.delegateScrollBy(this, getUnboundedScroll(), x, y);
-    }
-
     @Override
     public void scrollTo(int x, int y) {
-        int primaryScroll = mOrientationHandler.getPrimaryValue(x, y);
-        int secondaryScroll = mOrientationHandler.getSecondaryValue(x, y);
-        mUnboundedScroll = primaryScroll;
-
-        boolean isBeforeFirstPage = mIsRtl ?
-            (primaryScroll > mMaxScroll) : (primaryScroll < mMinScroll);
-        boolean isAfterLastPage = mIsRtl ?
-            (primaryScroll < mMinScroll) : (primaryScroll > mMaxScroll);
-        if (!isBeforeFirstPage && !isAfterLastPage) {
-            mSpringOverScroll = 0;
-        }
-
-        if (isBeforeFirstPage) {
-            mOrientationHandler.delegateScrollTo(this,
-                secondaryScroll, mIsRtl ? mMaxScroll : mMinScroll);
-            if (mAllowOverScroll) {
-                mWasInOverscroll = true;
-                overScroll(primaryScroll - (mIsRtl ? mMaxScroll : mMinScroll));
-            }
-        } else if (isAfterLastPage) {
-            mOrientationHandler.delegateScrollTo(this,
-                secondaryScroll, mIsRtl ? mMinScroll : mMaxScroll);
-            if (mAllowOverScroll) {
-                mWasInOverscroll = true;
-                overScroll(primaryScroll - (mIsRtl ? mMinScroll : mMaxScroll));
-            }
-        } else {
-            if (mWasInOverscroll) {
-                overScroll(0);
-                mWasInOverscroll = false;
-            }
-            super.scrollTo(x, y);
-        }
-    }
-
-    /**
-     * Helper for {@link PagedOrientationHandler} to be able to call parent's scrollTo method
-     */
-    public void superScrollTo(int x, int y) {
+        x = Utilities.boundToRange(x,
+                mOrientationHandler.getPrimaryValue(mMinScroll, 0), mMaxScroll);
+        y = Utilities.boundToRange(y,
+                mOrientationHandler.getPrimaryValue(0, mMinScroll), mMaxScroll);
         super.scrollTo(x, y);
     }
 
@@ -524,12 +469,22 @@ public abstract class PagedView<T extends View & PageIndicator> extends ViewGrou
     protected boolean computeScrollHelper(boolean shouldInvalidate) {
         if (mScroller.computeScrollOffset()) {
             // Don't bother scrolling if the page does not need to be moved
-            int currentScroll = mOrientationHandler.getPrimaryScroll(this);
-            if (mUnboundedScroll != mScroller.getCurrPos()
-                || currentScroll != mScroller.getCurrPos()) {
-                mOrientationHandler.set(this, VIEW_SCROLL_TO, mScroller.getCurrPos());
+            int oldPos = mOrientationHandler.getPrimaryScroll(this);
+            int newPos = mScroller.getCurrX();
+            if (oldPos != newPos) {
+                mOrientationHandler.set(this, VIEW_SCROLL_TO, mScroller.getCurrX());
             }
             if (shouldInvalidate) {
+                if (mAllowOverScroll) {
+                    if (newPos < mMinScroll && oldPos >= mMinScroll) {
+                        mEdgeGlowLeft.onAbsorb((int) mScroller.getCurrVelocity());
+                        mScroller.abortAnimation();
+                    } else if (newPos > mMaxScroll && oldPos <= mMaxScroll) {
+                        mEdgeGlowRight.onAbsorb((int) mScroller.getCurrVelocity());
+                        mScroller.abortAnimation();
+                    }
+                }
+
                 invalidate();
             }
             return true;
@@ -982,9 +937,7 @@ public abstract class PagedView<T extends View & PageIndicator> extends ViewGrou
                 mTotalMotion = 0;
                 mAllowEasyFling = false;
                 mActivePointerId = ev.getPointerId(0);
-
-                updateIsBeingDraggedOnTouchDown();
-
+                updateIsBeingDraggedOnTouchDown(ev);
                 break;
             }
 
@@ -1009,9 +962,9 @@ public abstract class PagedView<T extends View & PageIndicator> extends ViewGrou
     /**
      * If being flinged and user touches the screen, initiate drag; otherwise don't.
      */
-    private void updateIsBeingDraggedOnTouchDown() {
+    private void updateIsBeingDraggedOnTouchDown(MotionEvent ev) {
         // mScroller.isFinished should be false when being flinged.
-        final int xDist = Math.abs(mScroller.getFinalPos() - mScroller.getCurrPos());
+        final int xDist = Math.abs(mScroller.getFinalX() - mScroller.getCurrX());
         final boolean finishedScrolling = (mScroller.isFinished() || xDist < mPageSlop / 3);
 
         if (finishedScrolling) {
@@ -1020,9 +973,20 @@ public abstract class PagedView<T extends View & PageIndicator> extends ViewGrou
                 setCurrentPage(getNextPage());
                 pageEndTransition();
             }
+            mIsBeingDragged = !mEdgeGlowLeft.isFinished() || !mEdgeGlowRight.isFinished();
         } else {
             mIsBeingDragged = true;
         }
+
+        // Catch the edge effect if it is active.
+        float displacement = mOrientationHandler.getSecondaryValue(ev.getX(), ev.getY())
+                / mOrientationHandler.getSecondaryValue(getWidth(), getHeight());
+        if (!mEdgeGlowLeft.isFinished()) {
+            mEdgeGlowLeft.onPullDistance(0f, 1f - displacement);
+        }
+        if (!mEdgeGlowRight.isFinished()) {
+            mEdgeGlowRight.onPullDistance(0f, displacement);
+        }
     }
 
     public boolean isHandlingTouch() {
@@ -1053,7 +1017,6 @@ public abstract class PagedView<T extends View & PageIndicator> extends ViewGrou
             mTotalMotion += Math.abs(mLastMotion - primaryDirection);
             mLastMotion = primaryDirection;
             mLastMotionRemainder = 0;
-            onScrollInteractionBegin();
             pageBeginTransition();
             // Stop listening for things like pinches.
             requestDisallowInterceptTouchEvent(true);
@@ -1114,69 +1077,6 @@ public abstract class PagedView<T extends View & PageIndicator> extends ViewGrou
         }
     }
 
-    @Override
-    protected void dispatchDraw(Canvas canvas) {
-        if (mScroller.isSpringing() && mSpringOverScroll != 0) {
-            int saveCount = canvas.save();
-            mOrientationHandler.set(canvas, CANVAS_TRANSLATE, -mSpringOverScroll);
-            super.dispatchDraw(canvas);
-
-            canvas.restoreToCount(saveCount);
-        } else {
-            super.dispatchDraw(canvas);
-        }
-    }
-
-    /**
-     * Returns the amount of overscroll caused by the spring in {@link OverScroller}.
-     */
-    private int getSpringOverScroll(int amount) {
-        if (mScroller.isSpringing()) {
-            return amount < 0
-                    ? mScroller.getCurrPos() - mMinScroll
-                    : Math.max(0, mScroller.getCurrPos() - mMaxScroll);
-        } else {
-            return 0;
-        }
-    }
-
-    protected void dampedOverScroll(int amount) {
-        if (amount == 0) {
-            return;
-        }
-
-        int size = mOrientationHandler.getMeasuredSize(this);
-        int overScrollAmount = OverScroll.dampedScroll(amount, size);
-        if (mScroller.isSpringing()) {
-            mSpringOverScroll = getSpringOverScroll(amount);
-            invalidate();
-            return;
-        }
-
-        int primaryScroll = mOrientationHandler.getPrimaryScroll(this);
-        int boundedScroll = Utilities.boundToRange(primaryScroll, mMinScroll, mMaxScroll);
-        mOrientationHandler.delegateScrollTo(this, boundedScroll + overScrollAmount);
-        invalidate();
-    }
-
-    protected void overScroll(int amount) {
-        if (mScroller.isSpringing()) {
-            mSpringOverScroll = getSpringOverScroll(amount);
-            invalidate();
-            return;
-        }
-
-        if (amount == 0) return;
-
-        if (mFreeScroll && !mScroller.isFinished()) {
-            int scrollAmount = amount < 0 ? mMinScroll + amount : mMaxScroll + amount;
-            mOrientationHandler.delegateScrollTo(this, scrollAmount);
-        } else {
-            dampedOverScroll(amount);
-        }
-    }
-
-
     public void setEnableFreeScroll(boolean freeScroll) {
         if (mFreeScroll == freeScroll) {
             return;
@@ -1209,7 +1109,7 @@ public abstract class PagedView<T extends View & PageIndicator> extends ViewGrou
 
         switch (action & MotionEvent.ACTION_MASK) {
         case MotionEvent.ACTION_DOWN:
-            updateIsBeingDraggedOnTouchDown();
+            updateIsBeingDraggedOnTouchDown(ev);
 
             /*
              * If being flinged and user touches, stop the fling. isFinished
@@ -1228,7 +1128,6 @@ public abstract class PagedView<T extends View & PageIndicator> extends ViewGrou
             mAllowEasyFling = false;
             mActivePointerId = ev.getPointerId(0);
             if (mIsBeingDragged) {
-                onScrollInteractionBegin();
                 pageBeginTransition();
             }
             break;
@@ -1245,19 +1144,62 @@ public abstract class PagedView<T extends View & PageIndicator> extends ViewGrou
                 final int pointerIndex = ev.findPointerIndex(mActivePointerId);
 
                 if (pointerIndex == -1) return true;
+                float oldScroll = mOrientationHandler.getPrimaryScroll(this);
+                float dx = ev.getX(pointerIndex);
+                float dy = ev.getY(pointerIndex);
 
-                float direction = mOrientationHandler.getPrimaryDirection(ev, pointerIndex);
+                float direction = mOrientationHandler.getPrimaryValue(dx, dy);
                 float delta = mLastMotion + mLastMotionRemainder - direction;
+
+                int width = getWidth();
+                int height = getHeight();
+                int size = mOrientationHandler.getPrimaryValue(width, height);
+
+                final float displacement = mOrientationHandler.getSecondaryValue(dx, dy)
+                        / mOrientationHandler.getSecondaryValue(width, height);
                 mTotalMotion += Math.abs(delta);
 
+                if (mAllowOverScroll) {
+                    float consumed = 0;
+                    if (delta < 0 && mEdgeGlowRight.getDistance() != 0f) {
+                        consumed = size * mEdgeGlowRight.onPullDistance(delta / size, displacement);
+                    } else if (delta > 0 && mEdgeGlowLeft.getDistance() != 0f) {
+                        consumed = -size * mEdgeGlowLeft.onPullDistance(
+                                -delta / size, 1 - displacement);
+                    }
+                    delta -= consumed;
+                }
+
                 // Only scroll and update mLastMotionX if we have moved some discrete amount.  We
                 // keep the remainder because we are actually testing if we've moved from the last
                 // scrolled position (which is discrete).
-                if (Math.abs(delta) >= 1.0f) {
-                    mLastMotion = direction;
-                    mLastMotionRemainder = delta - (int) delta;
+                mLastMotion = direction;
+                int movedDelta = (int) delta;
+                mLastMotionRemainder = delta - movedDelta;
+
+                if (delta != 0) {
+                    mOrientationHandler.set(this, VIEW_SCROLL_BY, movedDelta);
+
+                    if (mAllowOverScroll) {
+                        final float pulledToX = oldScroll + delta;
+
+                        if (pulledToX < mMinScroll) {
+                            mEdgeGlowLeft.onPullDistance(-delta / size, 1.f - displacement);
+                            if (!mEdgeGlowRight.isFinished()) {
+                                mEdgeGlowRight.onRelease();
+                            }
+                        } else if (pulledToX > mMaxScroll) {
+                            mEdgeGlowRight.onPullDistance(delta / size, displacement);
+                            if (!mEdgeGlowLeft.isFinished()) {
+                                mEdgeGlowLeft.onRelease();
+                            }
+                        }
+
+                        if (!mEdgeGlowLeft.isFinished() || !mEdgeGlowRight.isFinished()) {
+                            postInvalidateOnAnimation();
+                        }
+                    }
 
-                    mOrientationHandler.set(this, VIEW_SCROLL_BY, (int) delta);
                 } else {
                     awakenScrollBars();
                 }
@@ -1335,45 +1277,24 @@ public abstract class PagedView<T extends View & PageIndicator> extends ViewGrou
 
                     if (((initialScroll >= maxScroll) && (isVelocityLeft || !isFling)) ||
                         ((initialScroll <= minScroll) && (!isVelocityLeft || !isFling))) {
-                        mScroller.springBack(initialScroll, minScroll, maxScroll);
+                        mScroller.springBack(initialScroll, 0, minScroll, maxScroll, 0, 0);
                         mNextPage = getDestinationPage();
                     } else {
-                        mScroller.setInterpolator(mDefaultInterpolator);
-                        mScroller.fling(initialScroll, -velocity,
-                            minScroll, maxScroll,
-                            Math.round(getWidth() * 0.5f * OVERSCROLL_DAMP_FACTOR));
+                        int velocity1 = -velocity;
+                        // Continue a scroll or fling in progress
+                        mScroller.fling(initialScroll, 0, velocity1, 0, minScroll, maxScroll, 0, 0,
+                                Math.round(getWidth() * 0.5f * OVERSCROLL_DAMP_FACTOR), 0);
 
-                        int finalPos = mScroller.getFinalPos();
+                        int finalPos = mScroller.getFinalX();
                         mNextPage = getDestinationPage(finalPos);
-
-                        int firstPageScroll = getScrollForPage(!mIsRtl ? 0 : getPageCount() - 1);
-                        int lastPageScroll = getScrollForPage(!mIsRtl ? getPageCount() - 1 : 0);
-                        if (snapToPageInFreeScroll() && finalPos > minScroll
-                                && finalPos < maxScroll) {
-                            // If scrolling ends in the half of the added space that is closer to
-                            // the end, settle to the end. Otherwise snap to the nearest page.
-                            // If flinging past one of the ends, don't change the velocity as it
-                            // will get stopped at the end anyway.
-                            int pageSnapped = finalPos < (firstPageScroll + minScroll) / 2
-                                ? minScroll
-                                : finalPos > (lastPageScroll + maxScroll) / 2
-                                    ? maxScroll
-                                    : getScrollForPage(mNextPage);
-
-                            mScroller.setFinalPos(pageSnapped);
-                            // Ensure the scroll/snap doesn't happen too fast;
-                            int extraScrollDuration = OVERSCROLL_PAGE_SNAP_ANIMATION_DURATION
-                                - mScroller.getDuration();
-                            if (extraScrollDuration > 0) {
-                                mScroller.extendDuration(extraScrollDuration);
-                            }
-                        }
+                        onNotSnappingToPageInFreeScroll();
                     }
                     invalidate();
                 }
-                onScrollInteractionEnd();
             }
 
+            mEdgeGlowLeft.onRelease();
+            mEdgeGlowRight.onRelease();
             // End any intermediate reordering states
             resetTouchState();
             break;
@@ -1381,8 +1302,9 @@ public abstract class PagedView<T extends View & PageIndicator> extends ViewGrou
         case MotionEvent.ACTION_CANCEL:
             if (mIsBeingDragged) {
                 snapToDestination();
-                onScrollInteractionEnd();
             }
+            mEdgeGlowLeft.onRelease();
+            mEdgeGlowRight.onRelease();
             resetTouchState();
             break;
 
@@ -1395,9 +1317,7 @@ public abstract class PagedView<T extends View & PageIndicator> extends ViewGrou
         return true;
     }
 
-    protected boolean snapToPageInFreeScroll() {
-        return true;
-    }
+    protected void onNotSnappingToPageInFreeScroll() { }
 
     protected boolean shouldFlingForVelocity(int velocity) {
         float threshold = mAllowEasyFling ? mEasyFlingThresholdVelocity : mFlingThresholdVelocity;
@@ -1410,15 +1330,6 @@ public abstract class PagedView<T extends View & PageIndicator> extends ViewGrou
         mActivePointerId = INVALID_POINTER;
     }
 
-    /**
-     * Triggered by scrolling via touch
-     */
-    protected void onScrollInteractionBegin() {
-    }
-
-    protected void onScrollInteractionEnd() {
-    }
-
     @Override
     public boolean onGenericMotionEvent(MotionEvent event) {
         if ((event.getSource() & InputDevice.SOURCE_CLASS_POINTER) != 0) {
@@ -1554,19 +1465,7 @@ public abstract class PagedView<T extends View & PageIndicator> extends ViewGrou
     }
 
     protected void snapToDestination() {
-        snapToPage(getDestinationPage(), getPageSnapDuration());
-    }
-
-    protected boolean isInOverScroll() {
-        int scroll = mOrientationHandler.getPrimaryScroll(this);
-        return scroll > mMaxScroll || scroll < mMinScroll;
-    }
-
-    protected int getPageSnapDuration() {
-        if (isInOverScroll()) {
-            return OVERSCROLL_PAGE_SNAP_ANIMATION_DURATION;
-        }
-        return PAGE_SNAP_ANIMATION_DURATION;
+        snapToPage(getDestinationPage(), PAGE_SNAP_ANIMATION_DURATION);
     }
 
     // We want the duration of the page snap animation to be influenced by the distance that
@@ -1584,7 +1483,7 @@ public abstract class PagedView<T extends View & PageIndicator> extends ViewGrou
         int halfScreenSize = mOrientationHandler.getMeasuredSize(this) / 2;
 
         final int newLoc = getScrollForPage(whichPage);
-        int delta = newLoc - getUnboundedScroll();
+        int delta = newLoc - mOrientationHandler.getPrimaryScroll(this);
         int duration = 0;
 
         if (Math.abs(velocity) < mMinFlingVelocity) {
@@ -1609,12 +1508,7 @@ public abstract class PagedView<T extends View & PageIndicator> extends ViewGrou
         // interpolator at zero, ie. 5. We use 4 to make it a little slower.
         duration = 4 * Math.round(1000 * Math.abs(distance / velocity));
 
-        if (QUICKSTEP_SPRINGS.get() && mCurrentPage != whichPage) {
-            return snapToPage(whichPage, delta, duration, false, null,
-                    velocity * Math.signum(delta), true);
-        } else {
-            return snapToPage(whichPage, delta, duration);
-        }
+        return snapToPage(whichPage, delta, duration);
     }
 
     public boolean snapToPage(int whichPage) {
@@ -1622,32 +1516,26 @@ public abstract class PagedView<T extends View & PageIndicator> extends ViewGrou
     }
 
     public boolean snapToPageImmediately(int whichPage) {
-        return snapToPage(whichPage, PAGE_SNAP_ANIMATION_DURATION, true, null);
+        return snapToPage(whichPage, PAGE_SNAP_ANIMATION_DURATION, true);
     }
 
     public boolean snapToPage(int whichPage, int duration) {
-        return snapToPage(whichPage, duration, false, null);
+        return snapToPage(whichPage, duration, false);
     }
 
-    public boolean snapToPage(int whichPage, int duration, TimeInterpolator interpolator) {
-        return snapToPage(whichPage, duration, false, interpolator);
-    }
-
-    protected boolean snapToPage(int whichPage, int duration, boolean immediate,
-            TimeInterpolator interpolator) {
+    protected boolean snapToPage(int whichPage, int duration, boolean immediate) {
         whichPage = validateNewPage(whichPage);
 
         int newLoc = getScrollForPage(whichPage);
-        final int delta = newLoc - getUnboundedScroll();
-        return snapToPage(whichPage, delta, duration, immediate, interpolator, 0, false);
+        final int delta = newLoc - mOrientationHandler.getPrimaryScroll(this);
+        return snapToPage(whichPage, delta, duration, immediate);
     }
 
     protected boolean snapToPage(int whichPage, int delta, int duration) {
-        return snapToPage(whichPage, delta, duration, false, null, 0, false);
+        return snapToPage(whichPage, delta, duration, false);
     }
 
-    protected boolean snapToPage(int whichPage, int delta, int duration, boolean immediate,
-            TimeInterpolator interpolator, float velocity, boolean spring) {
+    protected boolean snapToPage(int whichPage, int delta, int duration, boolean immediate) {
         if (mFirstLayout) {
             setCurrentPage(whichPage);
             return false;
@@ -1677,18 +1565,7 @@ public abstract class PagedView<T extends View & PageIndicator> extends ViewGrou
             abortScrollerAnimation(false);
         }
 
-        if (interpolator != null) {
-            mScroller.setInterpolator(interpolator);
-        } else {
-            mScroller.setInterpolator(mDefaultInterpolator);
-        }
-
-        if (spring && QUICKSTEP_SPRINGS.get()) {
-            mScroller.startScrollSpring(getUnboundedScroll(), delta, duration, velocity);
-        } else {
-            mScroller.startScroll(getUnboundedScroll(), delta, duration);
-        }
-
+        mScroller.startScroll(mOrientationHandler.getPrimaryScroll(this), 0, delta, 0, duration);
         updatePageIndicator();
 
         // Trigger a compute() to finish switching pages if necessary
@@ -1706,7 +1583,7 @@ public abstract class PagedView<T extends View & PageIndicator> extends ViewGrou
             snapToPage(getNextPage() - 1);
             return true;
         }
-        return onOverscroll(-getMeasuredWidth());
+        return mAllowOverScroll;
     }
 
     public boolean scrollRight() {
@@ -1714,15 +1591,7 @@ public abstract class PagedView<T extends View & PageIndicator> extends ViewGrou
             snapToPage(getNextPage() + 1);
             return true;
         }
-        return onOverscroll(getMeasuredWidth());
-    }
-
-    protected boolean onOverscroll(int amount) {
-        if (!mAllowOverScroll) return false;
-        onScrollInteractionBegin();
-        overScroll(amount);
-        onScrollInteractionEnd();
-        return true;
+        return mAllowOverScroll;
     }
 
     @Override
@@ -1866,4 +1735,38 @@ public abstract class PagedView<T extends View & PageIndicator> extends ViewGrou
         mTmpIntPair[1] = rightChild;
         return mTmpIntPair;
     }
+
+    @Override
+    public void draw(Canvas canvas) {
+        super.draw(canvas);
+        drawEdgeEffect(canvas);
+    }
+
+    protected void drawEdgeEffect(Canvas canvas) {
+        if (mAllowOverScroll && (!mEdgeGlowRight.isFinished() || !mEdgeGlowLeft.isFinished())) {
+            final int width = getWidth();
+            final int height = getHeight();
+            if (!mEdgeGlowLeft.isFinished()) {
+                final int restoreCount = canvas.save();
+                canvas.rotate(-90);
+                canvas.translate(-height, Math.min(mMinScroll, getScrollX()));
+                mEdgeGlowLeft.setSize(height, width);
+                if (mEdgeGlowLeft.draw(canvas)) {
+                    postInvalidateOnAnimation();
+                }
+                canvas.restoreToCount(restoreCount);
+            }
+            if (!mEdgeGlowRight.isFinished()) {
+                final int restoreCount = canvas.save();
+                canvas.rotate(90, width, 0);
+                canvas.translate(width, -(Math.max(mMaxScroll, getScrollX())));
+
+                mEdgeGlowRight.setSize(height, width);
+                if (mEdgeGlowRight.draw(canvas)) {
+                    postInvalidateOnAnimation();
+                }
+                canvas.restoreToCount(restoreCount);
+            }
+        }
+    }
 }

src/com/android/launcher3/Workspace.java

@@ -24,7 +24,6 @@ import static com.android.launcher3.LauncherState.FLAG_WORKSPACE_ICONS_CAN_BE_DR
 import static com.android.launcher3.LauncherState.FLAG_WORKSPACE_INACCESSIBLE;
 import static com.android.launcher3.LauncherState.HINT_STATE;
 import static com.android.launcher3.LauncherState.NORMAL;
-import static com.android.launcher3.LauncherState.OVERVIEW;
 import static com.android.launcher3.LauncherState.SPRING_LOADED;
 import static com.android.launcher3.config.FeatureFlags.ADAPTIVE_ICON_WINDOW_ANIM;
 import static com.android.launcher3.dragndrop.DragLayer.ALPHA_INDEX_OVERLAY;
@@ -96,10 +95,12 @@ import com.android.launcher3.statemanager.StateManager;
 import com.android.launcher3.statemanager.StateManager.StateHandler;
 import com.android.launcher3.states.StateAnimationConfig;
 import com.android.launcher3.touch.WorkspaceTouchListener;
+import com.android.launcher3.util.EdgeEffectCompat;
 import com.android.launcher3.util.Executors;
 import com.android.launcher3.util.IntArray;
 import com.android.launcher3.util.IntSparseArrayMap;
 import com.android.launcher3.util.ItemInfoMatcher;
+import com.android.launcher3.util.OverlayEdgeEffect;
 import com.android.launcher3.util.PackageUserKey;
 import com.android.launcher3.util.Thunk;
 import com.android.launcher3.util.WallpaperOffsetInterpolator;
@@ -245,10 +246,7 @@ public class Workspace extends PagedView<WorkspacePageIndicator>
     private float mTransitionProgress;
 
     // State related to Launcher Overlay
-    LauncherOverlay mLauncherOverlay;
-    boolean mScrollInteractionBegan;
-    boolean mStartedSendingScrollEvents;
-    float mLastOverlayScroll = 0;
+    private OverlayEdgeEffect mOverlayEdgeEffect;
     boolean mOverlayShown = false;
     private Runnable mOnOverlayHiddenCallback;
 
@@ -945,47 +943,25 @@ public class Workspace extends PagedView<WorkspacePageIndicator>
         }
     }
 
-    protected void onScrollInteractionBegin() {
-        super.onScrollInteractionBegin();
-        mScrollInteractionBegan = true;
-    }
-
-    protected void onScrollInteractionEnd() {
-        super.onScrollInteractionEnd();
-        mScrollInteractionBegan = false;
-        if (mStartedSendingScrollEvents) {
-            mStartedSendingScrollEvents = false;
-            mLauncherOverlay.onScrollInteractionEnd();
-        }
-    }
-
     public void setLauncherOverlay(LauncherOverlay overlay) {
-        mLauncherOverlay = overlay;
-        // A new overlay has been set. Reset event tracking
-        mStartedSendingScrollEvents = false;
+        mOverlayEdgeEffect = overlay == null ? null : new OverlayEdgeEffect(getContext(), overlay);
+        EdgeEffectCompat newEffect = overlay == null
+                ? new EdgeEffectCompat(getContext()) : mOverlayEdgeEffect;
+        if (mIsRtl) {
+            mEdgeGlowRight = newEffect;
+        } else {
+            mEdgeGlowLeft = newEffect;
+        }
         onOverlayScrollChanged(0);
     }
 
     public boolean hasOverlay() {
-        return mLauncherOverlay != null;
-    }
-
-    private boolean isScrollingOverlay() {
-        return mLauncherOverlay != null &&
-                ((mIsRtl && getUnboundedScroll() > mMaxScroll)
-                        || (!mIsRtl && getUnboundedScroll() < mMinScroll));
+        return mOverlayEdgeEffect != null;
     }
 
     @Override
     protected void snapToDestination() {
-        // If we're overscrolling the overlay, we make sure to immediately reset the PagedView
-        // to it's baseline position instead of letting the overscroll settle. The overlay handles
-        // it's own settling, and every gesture to the overlay should be self-contained and start
-        // from 0, so we zero it out here.
-        if (isScrollingOverlay()) {
-            // We reset mWasInOverscroll so that PagedView doesn't zero out the overscroll
-            // interaction when we call snapToPageImmediately.
-            mWasInOverscroll = false;
+        if (mOverlayEdgeEffect != null && !mOverlayEdgeEffect.isFinished()) {
             snapToPageImmediately(0);
         } else {
             super.snapToDestination();
@@ -1017,38 +993,6 @@ public class Workspace extends PagedView<WorkspacePageIndicator>
         }
     }
 
-    @Override
-    protected void overScroll(int amount) {
-        boolean shouldScrollOverlay = mLauncherOverlay != null && !mScroller.isSpringing() &&
-                ((amount <= 0 && !mIsRtl) || (amount >= 0 && mIsRtl));
-
-        boolean shouldZeroOverlay = mLauncherOverlay != null && mLastOverlayScroll != 0 &&
-                ((amount >= 0 && !mIsRtl) || (amount <= 0 && mIsRtl));
-
-        if (shouldScrollOverlay) {
-            if (!mStartedSendingScrollEvents && mScrollInteractionBegan) {
-                mStartedSendingScrollEvents = true;
-                mLauncherOverlay.onScrollInteractionBegin();
-            }
-
-            mLastOverlayScroll = Math.abs(((float) amount) / getMeasuredWidth());
-            mLauncherOverlay.onScrollChange(mLastOverlayScroll, mIsRtl);
-        } else {
-            dampedOverScroll(amount);
-        }
-
-        if (shouldZeroOverlay) {
-            mLauncherOverlay.onScrollChange(0, mIsRtl);
-        }
-    }
-
-    @Override
-    protected boolean onOverscroll(int amount) {
-        // Enforce overscroll on -1 direction
-        if ((amount > 0 && !mIsRtl) || (amount < 0 && mIsRtl)) return false;
-        return super.onOverscroll(amount);
-    }
-
     @Override
     protected boolean shouldFlingForVelocity(int velocityX) {
         // When the overlay is moving, the fling or settle transition is controlled by the overlay.
@@ -1377,10 +1321,6 @@ public class Workspace extends PagedView<WorkspacePageIndicator>
         mOutlineProvider = outlineProvider;
     }
 
-    public void snapToPageFromOverView(int whichPage) {
-        snapToPage(whichPage, OVERVIEW.getTransitionDuration(mLauncher), Interpolators.ZOOM_IN);
-    }
-
     private void onStartStateTransition(LauncherState state) {
         mIsSwitchingState = true;
         mTransitionProgress = 0;

src/com/android/launcher3/folder/FolderPagedView.java

@@ -42,7 +42,6 @@ import com.android.launcher3.R;
 import com.android.launcher3.ShortcutAndWidgetContainer;
 import com.android.launcher3.Utilities;
 import com.android.launcher3.Workspace.ItemOperator;
-import com.android.launcher3.anim.Interpolators;
 import com.android.launcher3.keyboard.ViewGroupFocusHelper;
 import com.android.launcher3.model.data.ItemInfo;
 import com.android.launcher3.model.data.WorkspaceItemInfo;
@@ -433,8 +432,7 @@ public class FolderPagedView extends PagedView<PageIndicatorDots> {
         int scroll = getScrollForPage(getNextPage()) + hint;
         int delta = scroll - getScrollX();
         if (delta != 0) {
-            mScroller.setInterpolator(Interpolators.DEACCEL);
-            mScroller.startScroll(getScrollX(), delta, Folder.SCROLL_HINT_DURATION);
+            mScroller.startScroll(getScrollX(), 0, delta, 0, Folder.SCROLL_HINT_DURATION);
             invalidate();
         }
     }

src/com/android/launcher3/touch/LandscapePagedViewHandler.java

@@ -38,10 +38,8 @@ import android.view.accessibility.AccessibilityEvent;
 import android.widget.LinearLayout;
 
 import com.android.launcher3.DeviceProfile;
-import com.android.launcher3.PagedView;
 import com.android.launcher3.R;
 import com.android.launcher3.Utilities;
-import com.android.launcher3.util.OverScroller;
 import com.android.launcher3.util.SplitConfigurationOptions.SplitPositionOption;
 
 import java.util.Collections;
@@ -60,18 +58,23 @@ public class LandscapePagedViewHandler implements PagedOrientationHandler {
     }
 
     @Override
-    public void delegateScrollTo(PagedView pagedView, int secondaryScroll, int minMaxScroll) {
-        pagedView.superScrollTo(secondaryScroll, minMaxScroll);
+    public int getPrimaryValue(int x, int y) {
+        return y;
     }
 
     @Override
-    public void delegateScrollBy(PagedView pagedView, int unboundedScroll, int x, int y) {
-        pagedView.scrollTo(pagedView.getScrollX() + x, unboundedScroll + y);
+    public int getSecondaryValue(int x, int y) {
+        return x;
     }
 
     @Override
-    public void scrollerStartScroll(OverScroller scroller, int newPosition) {
-        scroller.startScroll(scroller.getCurrPos(), newPosition - scroller.getCurrPos());
+    public float getPrimaryValue(float x, float y) {
+        return y;
+    }
+
+    @Override
+    public float getSecondaryValue(float x, float y) {
+        return x;
     }
 
     @Override
@@ -86,11 +89,6 @@ public class LandscapePagedViewHandler implements PagedOrientationHandler {
         velocity.set(-oldY, oldX);
     }
 
-    @Override
-    public void delegateScrollTo(PagedView pagedView, int primaryScroll) {
-        pagedView.superScrollTo(pagedView.getScrollX(), primaryScroll);
-    }
-
     @Override
     public <T> void set(T target, Int2DAction<T> action, int param) {
         action.call(target, 0, param);
@@ -241,13 +239,13 @@ public class LandscapePagedViewHandler implements PagedOrientationHandler {
     }
 
     @Override
-    public float getTaskMenuX(float x, View thumbnailView) {
+    public float getTaskMenuX(float x, View thumbnailView, int overScroll) {
         return thumbnailView.getMeasuredWidth() + x;
     }
 
     @Override
-    public float getTaskMenuY(float y, View thumbnailView) {
-        return y;
+    public float getTaskMenuY(float y, View thumbnailView, int overScroll) {
+        return y + overScroll;
     }
 
     @Override

src/com/android/launcher3/touch/PagedOrientationHandler.java

@@ -30,8 +30,6 @@ import android.view.accessibility.AccessibilityEvent;
 import android.widget.LinearLayout;
 
 import com.android.launcher3.DeviceProfile;
-import com.android.launcher3.PagedView;
-import com.android.launcher3.util.OverScroller;
 import com.android.launcher3.util.SplitConfigurationOptions.SplitPositionOption;
 import com.android.launcher3.util.SplitConfigurationOptions.StagePosition;
 
@@ -89,16 +87,19 @@ public interface PagedOrientationHandler {
     boolean getRecentsRtlSetting(Resources resources);
     float getDegreesRotated();
     int getRotation();
+
     <T> T getPrimaryValue(T x, T y);
     <T> T getSecondaryValue(T x, T y);
-    void delegateScrollTo(PagedView pagedView, int secondaryScroll, int primaryScroll);
-    /** Uses {@params pagedView}.getScroll[X|Y]() method for the secondary amount*/
-    void delegateScrollTo(PagedView pagedView, int primaryScroll);
-    void delegateScrollBy(PagedView pagedView, int unboundedScroll, int x, int y);
-    void scrollerStartScroll(OverScroller scroller, int newPosition);
+
+    int getPrimaryValue(int x, int y);
+    int getSecondaryValue(int x, int y);
+
+    float  getPrimaryValue(float x, float y);
+    float getSecondaryValue(float x, float y);
+
     boolean isLayoutNaturalToLauncher();
-    float getTaskMenuX(float x, View thumbnailView);
-    float getTaskMenuY(float y, View thumbnailView);
+    float getTaskMenuX(float x, View thumbnailView, int overScroll);
+    float getTaskMenuY(float y, View thumbnailView, int overScroll);
     int getTaskMenuWidth(View view);
     int getTaskMenuLayoutOrientation(boolean canRecentsActivityRotate, LinearLayout taskMenuLayout);
     void setLayoutParamsForTaskMenuOptionItem(LinearLayout.LayoutParams lp);

src/com/android/launcher3/touch/PortraitPagedViewHandler.java

@@ -36,10 +36,8 @@ import android.view.accessibility.AccessibilityEvent;
 import android.widget.LinearLayout;
 
 import com.android.launcher3.DeviceProfile;
-import com.android.launcher3.PagedView;
 import com.android.launcher3.R;
 import com.android.launcher3.Utilities;
-import com.android.launcher3.util.OverScroller;
 import com.android.launcher3.util.SplitConfigurationOptions.SplitPositionOption;
 
 import java.util.ArrayList;
@@ -58,18 +56,23 @@ public class PortraitPagedViewHandler implements PagedOrientationHandler {
     }
 
     @Override
-    public void delegateScrollTo(PagedView pagedView, int secondaryScroll, int primaryScroll) {
-        pagedView.superScrollTo(primaryScroll, secondaryScroll);
+    public int getPrimaryValue(int x, int y) {
+        return x;
     }
 
     @Override
-    public void delegateScrollBy(PagedView pagedView, int unboundedScroll, int x, int y) {
-        pagedView.scrollTo(unboundedScroll + x, pagedView.getScrollY() + y);
+    public int getSecondaryValue(int x, int y) {
+        return y;
     }
 
     @Override
-    public void scrollerStartScroll(OverScroller scroller, int newPosition) {
-        scroller.startScroll(newPosition - scroller.getCurrPos(), scroller.getCurrPos());
+    public float getPrimaryValue(float x, float y) {
+        return x;
+    }
+
+    @Override
+    public float getSecondaryValue(float x, float y) {
+        return y;
     }
 
     @Override
@@ -82,11 +85,6 @@ public class PortraitPagedViewHandler implements PagedOrientationHandler {
         //no-op
     }
 
-    @Override
-    public void delegateScrollTo(PagedView pagedView, int primaryScroll) {
-        pagedView.superScrollTo(primaryScroll, pagedView.getScrollY());
-    }
-
     @Override
     public <T> void set(T target, Int2DAction<T> action, int param) {
         action.call(target, param, 0);
@@ -240,12 +238,12 @@ public class PortraitPagedViewHandler implements PagedOrientationHandler {
     }
 
     @Override
-    public float getTaskMenuX(float x, View thumbnailView) {
-        return x;
+    public float getTaskMenuX(float x, View thumbnailView, int overScroll) {
+        return x + overScroll;
     }
 
     @Override
-    public float getTaskMenuY(float y, View thumbnailView) {
+    public float getTaskMenuY(float y, View thumbnailView, int overScroll) {
         return y;
     }
 

src/com/android/launcher3/touch/SeascapePagedViewHandler.java

@@ -79,13 +79,13 @@ public class SeascapePagedViewHandler extends LandscapePagedViewHandler {
     }
 
     @Override
-    public float getTaskMenuX(float x, View thumbnailView) {
+    public float getTaskMenuX(float x, View thumbnailView, int overScroll) {
         return x;
     }
 
     @Override
-    public float getTaskMenuY(float y, View thumbnailView) {
-        return y + thumbnailView.getMeasuredHeight();
+    public float getTaskMenuY(float y, View thumbnailView, int overScroll) {
+        return y + thumbnailView.getMeasuredHeight() + overScroll;
     }
 
     @Override

src/com/android/launcher3/util/EdgeEffectCompat.java

@@ -0,0 +1,46 @@
+/*
+ * Copyright (C) 2021 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.util;
+
+import android.content.Context;
+import android.widget.EdgeEffect;
+
+import com.android.launcher3.Utilities;
+
+/**
+ * Extension of {@link EdgeEffect} to allow backwards compatibility
+ */
+public class EdgeEffectCompat extends EdgeEffect {
+
+    public EdgeEffectCompat(Context context) {
+        super(context);
+    }
+
+    @Override
+    public float getDistance() {
+        return Utilities.ATLEAST_S ? super.getDistance() : 0;
+    }
+
+    @Override
+    public float onPullDistance(float deltaDistance, float displacement) {
+        if (Utilities.ATLEAST_S) {
+            return super.onPullDistance(deltaDistance, displacement);
+        } else {
+            onPull(deltaDistance, displacement);
+            return deltaDistance;
+        }
+    }
+}

src/com/android/launcher3/util/OverScroller.java

@@ -1,867 +0,0 @@
-/*
- * Copyright (C) 2010 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.util;
-
-import static com.android.launcher3.anim.Interpolators.SCROLL;
-
-import android.animation.TimeInterpolator;
-import android.content.Context;
-import android.hardware.SensorManager;
-import android.util.Log;
-import android.view.ViewConfiguration;
-import android.view.animation.AnimationUtils;
-import android.view.animation.Interpolator;
-
-import androidx.dynamicanimation.animation.FloatPropertyCompat;
-import androidx.dynamicanimation.animation.SpringAnimation;
-import androidx.dynamicanimation.animation.SpringForce;
-
-import com.android.launcher3.R;
-import com.android.systemui.plugins.ResourceProvider;
-
-/**
- * Based on {@link android.widget.OverScroller} supporting only 1-d scrolling and with more
- * customization options.
- */
-public class OverScroller {
-    private int mMode;
-
-    private final SplineOverScroller mScroller;
-
-    private TimeInterpolator mInterpolator;
-
-    private final boolean mFlywheel;
-
-    private static final int DEFAULT_DURATION = 250;
-    private static final int SCROLL_MODE = 0;
-    private static final int FLING_MODE = 1;
-
-    /**
-     * Creates an OverScroller with a viscous fluid scroll interpolator and flywheel.
-     * @param context
-     */
-    public OverScroller(Context context) {
-        this(context, null);
-    }
-
-    /**
-     * Creates an OverScroller with flywheel enabled.
-     * @param context The context of this application.
-     * @param interpolator The scroll interpolator. If null, a default (viscous) interpolator will
-     * be used.
-     */
-    public OverScroller(Context context, Interpolator interpolator) {
-        this(context, interpolator, true);
-    }
-
-    /**
-     * Creates an OverScroller.
-     * @param context The context of this application.
-     * @param interpolator The scroll interpolator. If null, a default (viscous) interpolator will
-     * be used.
-     * @param flywheel If true, successive fling motions will keep on increasing scroll speed.
-     */
-    public OverScroller(Context context, Interpolator interpolator, boolean flywheel) {
-        if (interpolator == null) {
-            mInterpolator = SCROLL;
-        } else {
-            mInterpolator = interpolator;
-        }
-        mFlywheel = flywheel;
-        mScroller = new SplineOverScroller(context);
-    }
-
-    public void setInterpolator(TimeInterpolator interpolator) {
-        if (interpolator == null) {
-            mInterpolator = SCROLL;
-        } else {
-            mInterpolator = interpolator;
-        }
-    }
-
-    /**
-     * The amount of friction applied to flings. The default value
-     * is {@link ViewConfiguration#getScrollFriction}.
-     *
-     * @param friction A scalar dimension-less value representing the coefficient of
-     *         friction.
-     */
-    public final void setFriction(float friction) {
-        mScroller.setFriction(friction);
-    }
-
-    /**
-     *
-     * Returns whether the scroller has finished scrolling.
-     *
-     * @return True if the scroller has finished scrolling, false otherwise.
-     */
-    public final boolean isFinished() {
-        return mScroller.mFinished;
-    }
-
-    /**
-     * Force the finished field to a particular value. Contrary to
-     * {@link #abortAnimation()}, forcing the animation to finished
-     * does NOT cause the scroller to move to the final x and y
-     * position.
-     *
-     * @param finished The new finished value.
-     */
-    public final void forceFinished(boolean finished) {
-        mScroller.mFinished = finished;
-    }
-
-    /**
-     * Returns the current offset in the scroll.
-     *
-     * @return The new offset as an absolute distance from the origin.
-     */
-    public final int getCurrPos() {
-        return mScroller.mCurrentPosition;
-    }
-
-    /**
-     * Returns the absolute value of the current velocity.
-     *
-     * @return The original velocity less the deceleration, norm of the X and Y velocity vector.
-     */
-    public float getCurrVelocity() {
-        return mScroller.mCurrVelocity;
-    }
-
-    /**
-     * Returns the start offset in the scroll.
-     *
-     * @return The start offset as an absolute distance from the origin.
-     */
-    public final int getStartPos() {
-        return mScroller.mStart;
-    }
-
-    /**
-     * Returns where the scroll will end. Valid only for "fling" scrolls.
-     *
-     * @return The final offset as an absolute distance from the origin.
-     */
-    public final int getFinalPos() {
-        return mScroller.mFinal;
-    }
-
-    /**
-     * Returns how long the scroll event will take, in milliseconds.
-     *
-     * Note that if mScroller.mState == SPRING, this duration is ignored, so can only
-     * serve as an estimate for how long the spring-controlled scroll will take.
-     *
-     * @return The duration of the scroll in milliseconds.
-     */
-    public final int getDuration() {
-        return mScroller.mDuration;
-    }
-
-    /**
-     * Extend the scroll animation. This allows a running animation to scroll
-     * further and longer, when used with {@link #setFinalPos(int)}.
-     *
-     * @param extend Additional time to scroll in milliseconds.
-     * @see #setFinalPos(int)
-     */
-    public void extendDuration(int extend) {
-        mScroller.extendDuration(extend);
-    }
-
-    /**
-     * Sets the final position for this scroller.
-     *
-     * @param newPos The new offset as an absolute distance from the origin.
-     * @see #extendDuration(int)
-     */
-    public void setFinalPos(int newPos) {
-        mScroller.setFinalPosition(newPos);
-    }
-
-    /**
-     * Call this when you want to know the new location. If it returns true, the
-     * animation is not yet finished.
-     */
-    public boolean computeScrollOffset() {
-        if (isFinished()) {
-            return false;
-        }
-
-        switch (mMode) {
-            case SCROLL_MODE:
-                if (isSpringing()) {
-                    return true;
-                }
-                long time = AnimationUtils.currentAnimationTimeMillis();
-                // Any scroller can be used for time, since they were started
-                // together in scroll mode. We use X here.
-                final long elapsedTime = time - mScroller.mStartTime;
-
-                final int duration = mScroller.mDuration;
-                if (elapsedTime < duration) {
-                    final float q = mInterpolator.getInterpolation(elapsedTime / (float) duration);
-                    mScroller.updateScroll(q);
-                } else {
-                    abortAnimation();
-                }
-                break;
-
-            case FLING_MODE:
-                if (!mScroller.mFinished) {
-                    if (!mScroller.update()) {
-                        if (!mScroller.continueWhenFinished()) {
-                            mScroller.finish();
-                        }
-                    }
-                }
-
-                break;
-        }
-
-        return true;
-    }
-
-    /**
-     * Start scrolling by providing a starting point and the distance to travel.
-     * The scroll will use the default value of 250 milliseconds for the
-     * duration.
-     *
-     * @param start Starting horizontal scroll offset in pixels. Positive
-     *        numbers will scroll the content to the left.
-     * @param delta Distance to travel. Positive numbers will scroll the
-     *        content to the left.
-     */
-    public void startScroll(int start, int delta) {
-        startScroll(start, delta, DEFAULT_DURATION);
-    }
-
-    /**
-     * Start scrolling by providing a starting point and the distance to travel.
-     *
-     * @param start Starting scroll offset in pixels. Positive
-     *        numbers will scroll the content to the left.
-     * @param delta Distance to travel. Positive numbers will scroll the
-     *        content to the left.
-     * @param duration Duration of the scroll in milliseconds.
-     */
-    public void startScroll(int start, int delta, int duration) {
-        mMode = SCROLL_MODE;
-        mScroller.startScroll(start, delta, duration);
-    }
-
-    /**
-     * Start scrolling using a spring by providing a starting point and the distance to travel.
-     *
-     * @param start Starting scroll offset in pixels. Positive
-     *        numbers will scroll the content to the left.
-     * @param delta Distance to travel. Positive numbers will scroll the
-     *        content to the left.
-     * @param duration Duration of the scroll in milliseconds.
-     * @param velocity The starting velocity for the spring in px per ms.
-     */
-    public void startScrollSpring(int start, int delta, int duration, float velocity) {
-        mMode = SCROLL_MODE;
-        mScroller.mState = mScroller.SPRING;
-        mScroller.startScroll(start, delta, duration, velocity);
-    }
-
-    /**
-     * Call this when you want to 'spring back' into a valid coordinate range.
-     *
-     * @param start Starting X coordinate
-     * @param min Minimum valid X value
-     * @param max Maximum valid X value
-     * @return true if a springback was initiated, false if startX and startY were
-     *          already within the valid range.
-     */
-    public boolean springBack(int start, int min, int max) {
-        mMode = FLING_MODE;
-        return mScroller.springback(start, min, max);
-    }
-
-    public void fling(int start, int velocity, int min, int max) {
-        fling(start, velocity, min, max, 0);
-    }
-
-    /**
-     * Start scrolling based on a fling gesture. The distance traveled will
-     * depend on the initial velocity of the fling.
-     *  @param start Starting point of the scroll (X)
-     * @param velocity Initial velocity of the fling (X) measured in pixels per
-     *            second.
-     * @param min Minimum X value. The scroller will not scroll past this point
- *            unless overX > 0. If overfling is allowed, it will use minX as
- *            a springback boundary.
-     * @param max Maximum X value. The scroller will not scroll past this point
-*            unless overX > 0. If overfling is allowed, it will use maxX as
-*            a springback boundary.
-     * @param over Overfling range. If > 0, horizontal overfling in either
-*            direction will be possible.
-     */
-    public void fling(int start, int velocity, int min, int max, int over) {
-        // Continue a scroll or fling in progress
-        if (mFlywheel && !isFinished()) {
-            float oldVelocityX = mScroller.mCurrVelocity;
-            if (Math.signum(velocity) == Math.signum(oldVelocityX)) {
-                velocity += oldVelocityX;
-            }
-        }
-
-        mMode = FLING_MODE;
-        mScroller.fling(start, velocity, min, max, over);
-    }
-
-    /**
-     * Notify the scroller that we've reached a horizontal boundary.
-     * Normally the information to handle this will already be known
-     * when the animation is started, such as in a call to one of the
-     * fling functions. However there are cases where this cannot be known
-     * in advance. This function will transition the current motion and
-     * animate from startX to finalX as appropriate.
-     *  @param start Starting/current X position
-     * @param finalPos Desired final X position
-     * @param over Magnitude of overscroll allowed. This should be the maximum
-     */
-    public void notifyEdgeReached(int start, int finalPos, int over) {
-        mScroller.notifyEdgeReached(start, finalPos, over);
-    }
-
-    /**
-     * Returns whether the current Scroller is currently returning to a valid position.
-     * Valid bounds were provided by the
-     * {@link #fling(int, int, int, int, int)} method.
-     *
-     * One should check this value before calling
-     * {@link #startScroll(int, int)} as the interpolation currently in progress
-     * to restore a valid position will then be stopped. The caller has to take into account
-     * the fact that the started scroll will start from an overscrolled position.
-     *
-     * @return true when the current position is overscrolled and in the process of
-     *         interpolating back to a valid value.
-     */
-    public boolean isOverScrolled() {
-        return (!mScroller.mFinished && mScroller.mState != SplineOverScroller.SPLINE);
-    }
-
-    /**
-     * Stops the animation. Contrary to {@link #forceFinished(boolean)},
-     * aborting the animating causes the scroller to move to the final x and y
-     * positions.
-     *
-     * @see #forceFinished(boolean)
-     */
-    public void abortAnimation() {
-        mScroller.finish();
-    }
-
-    /**
-     * Returns the time elapsed since the beginning of the scrolling.
-     *
-     * @return The elapsed time in milliseconds.
-     *
-     * @hide
-     */
-    public int timePassed() {
-        final long time = AnimationUtils.currentAnimationTimeMillis();
-        return (int) (time - mScroller.mStartTime);
-    }
-
-    public boolean isSpringing() {
-        return mScroller.mState == SplineOverScroller.SPRING && !isFinished();
-    }
-
-    static class SplineOverScroller {
-        // Initial position
-        private int mStart;
-
-        // Current position
-        private int mCurrentPosition;
-
-        // Final position
-        private int mFinal;
-
-        // Initial velocity
-        private int mVelocity;
-
-        // Current velocity
-        private float mCurrVelocity;
-
-        // Constant current deceleration
-        private float mDeceleration;
-
-        // Animation starting time, in system milliseconds
-        private long mStartTime;
-
-        // Animation duration, in milliseconds
-        private int mDuration;
-
-        // Duration to complete spline component of animation
-        private int mSplineDuration;
-
-        // Distance to travel along spline animation
-        private int mSplineDistance;
-
-        // Whether the animation is currently in progress
-        private boolean mFinished;
-
-        // The allowed overshot distance before boundary is reached.
-        private int mOver;
-
-        // Fling friction
-        private float mFlingFriction = ViewConfiguration.getScrollFriction();
-
-        // Current state of the animation.
-        private int mState = SPLINE;
-
-        private Context mContext;
-        private SpringAnimation mSpring;
-
-        // Constant gravity value, used in the deceleration phase.
-        private static final float GRAVITY = 2000.0f;
-
-        // A context-specific coefficient adjusted to physical values.
-        private float mPhysicalCoeff;
-
-        private static float DECELERATION_RATE = (float) (Math.log(0.78) / Math.log(0.9));
-        private static final float INFLEXION = 0.35f; // Tension lines cross at (INFLEXION, 1)
-        private static final float START_TENSION = 0.5f;
-        private static final float END_TENSION = 1.0f;
-        private static final float P1 = START_TENSION * INFLEXION;
-        private static final float P2 = 1.0f - END_TENSION * (1.0f - INFLEXION);
-
-        private static final int NB_SAMPLES = 100;
-        private static final float[] SPLINE_POSITION = new float[NB_SAMPLES + 1];
-        private static final float[] SPLINE_TIME = new float[NB_SAMPLES + 1];
-
-        private static final int SPLINE = 0;
-        private static final int CUBIC = 1;
-        private static final int BALLISTIC = 2;
-        private static final int SPRING = 3;
-
-        private static final FloatPropertyCompat<SplineOverScroller> SPRING_PROPERTY =
-                new FloatPropertyCompat<SplineOverScroller>("splineOverScrollerSpring") {
-                    @Override
-                    public float getValue(SplineOverScroller scroller) {
-                        return scroller.mCurrentPosition;
-                    }
-
-                    @Override
-                    public void setValue(SplineOverScroller scroller, float value) {
-                        scroller.mCurrentPosition = (int) value;
-                    }
-                };
-
-        static {
-            float x_min = 0.0f;
-            float y_min = 0.0f;
-            for (int i = 0; i < NB_SAMPLES; i++) {
-                final float alpha = (float) i / NB_SAMPLES;
-
-                float x_max = 1.0f;
-                float x, tx, coef;
-                while (true) {
-                    x = x_min + (x_max - x_min) / 2.0f;
-                    coef = 3.0f * x * (1.0f - x);
-                    tx = coef * ((1.0f - x) * P1 + x * P2) + x * x * x;
-                    if (Math.abs(tx - alpha) < 1E-5) break;
-                    if (tx > alpha) x_max = x;
-                    else x_min = x;
-                }
-                SPLINE_POSITION[i] = coef * ((1.0f - x) * START_TENSION + x) + x * x * x;
-
-                float y_max = 1.0f;
-                float y, dy;
-                while (true) {
-                    y = y_min + (y_max - y_min) / 2.0f;
-                    coef = 3.0f * y * (1.0f - y);
-                    dy = coef * ((1.0f - y) * START_TENSION + y) + y * y * y;
-                    if (Math.abs(dy - alpha) < 1E-5) break;
-                    if (dy > alpha) y_max = y;
-                    else y_min = y;
-                }
-                SPLINE_TIME[i] = coef * ((1.0f - y) * P1 + y * P2) + y * y * y;
-            }
-            SPLINE_POSITION[NB_SAMPLES] = SPLINE_TIME[NB_SAMPLES] = 1.0f;
-        }
-
-        void setFriction(float friction) {
-            mFlingFriction = friction;
-        }
-
-        SplineOverScroller(Context context) {
-            mContext = context;
-            mFinished = true;
-            final float ppi = context.getResources().getDisplayMetrics().density * 160.0f;
-            mPhysicalCoeff = SensorManager.GRAVITY_EARTH // g (m/s^2)
-                    * 39.37f // inch/meter
-                    * ppi
-                    * 0.84f; // look and feel tuning
-        }
-
-        void updateScroll(float q) {
-            if (mState == SPRING) {
-                return;
-            }
-            mCurrentPosition = mStart + Math.round(q * (mFinal - mStart));
-        }
-
-        /*
-         * Get a signed deceleration that will reduce the velocity.
-         */
-        static private float getDeceleration(int velocity) {
-            return velocity > 0 ? -GRAVITY : GRAVITY;
-        }
-
-        /*
-         * Modifies mDuration to the duration it takes to get from start to newFinal using the
-         * spline interpolation. The previous duration was needed to get to oldFinal.
-         */
-        private void adjustDuration(int start, int oldFinal, int newFinal) {
-            final int oldDistance = oldFinal - start;
-            final int newDistance = newFinal - start;
-            final float x = Math.abs((float) newDistance / oldDistance);
-            final int index = (int) (NB_SAMPLES * x);
-            if (index < NB_SAMPLES) {
-                final float x_inf = (float) index / NB_SAMPLES;
-                final float x_sup = (float) (index + 1) / NB_SAMPLES;
-                final float t_inf = SPLINE_TIME[index];
-                final float t_sup = SPLINE_TIME[index + 1];
-                final float timeCoef = t_inf + (x - x_inf) / (x_sup - x_inf) * (t_sup - t_inf);
-                mDuration *= timeCoef;
-            }
-        }
-
-        void startScroll(int start, int distance, int duration) {
-            startScroll(start, distance, duration, 0);
-        }
-
-        void startScroll(int start, int distance, int duration, float velocity) {
-            mFinished = false;
-
-            mCurrentPosition = mStart = start;
-            mFinal = start + distance;
-
-            mStartTime = AnimationUtils.currentAnimationTimeMillis();
-            mDuration = duration;
-
-            if (mSpring != null) {
-                mSpring.cancel();
-            }
-
-            if (mState == SPRING) {
-                mSpring = new SpringAnimation(this, SPRING_PROPERTY);
-
-                ResourceProvider rp = DynamicResource.provider(mContext);
-                float stiffness = rp.getFloat(R.dimen.horizontal_spring_stiffness);
-                float damping = rp.getFloat(R.dimen.horizontal_spring_damping_ratio);
-                mSpring.setSpring(new SpringForce(mFinal)
-                        .setStiffness(stiffness)
-                        .setDampingRatio(damping));
-                mSpring.setStartVelocity(velocity);
-                mSpring.animateToFinalPosition(mFinal);
-                mSpring.addEndListener((animation, canceled, value, velocity1) -> {
-                    mSpring = null;
-                    finish();
-                    mState = SPLINE;
-                });
-            }
-            // Unused
-            mDeceleration = 0.0f;
-            mVelocity = 0;
-        }
-
-        void finish() {
-            if (mSpring != null && mSpring.isRunning()) mSpring.cancel();
-
-            mCurrentPosition = mFinal;
-            // Not reset since WebView relies on this value for fast fling.
-            // TODO: restore when WebView uses the fast fling implemented in this class.
-            // mCurrVelocity = 0.0f;
-            mFinished = true;
-        }
-
-        void setFinalPosition(int position) {
-            mFinal = position;
-            if (mState == SPRING && mSpring != null) {
-                mSpring.animateToFinalPosition(mFinal);
-            }
-            mSplineDistance = mFinal - mStart;
-            mFinished = false;
-        }
-
-        void extendDuration(int extend) {
-            final long time = AnimationUtils.currentAnimationTimeMillis();
-            final int elapsedTime = (int) (time - mStartTime);
-            mDuration  = mSplineDuration = elapsedTime + extend;
-            mFinished = false;
-        }
-
-        boolean springback(int start, int min, int max) {
-            mFinished = true;
-
-            mCurrentPosition = mStart = mFinal = start;
-            mVelocity = 0;
-
-            mStartTime = AnimationUtils.currentAnimationTimeMillis();
-            mDuration = 0;
-
-            if (start < min) {
-                startSpringback(start, min, 0);
-            } else if (start > max) {
-                startSpringback(start, max, 0);
-            }
-
-            return !mFinished;
-        }
-
-        private void startSpringback(int start, int end, int velocity) {
-            // mStartTime has been set
-            mFinished = false;
-            mState = CUBIC;
-            mCurrentPosition = mStart = start;
-            mFinal = end;
-            final int delta = start - end;
-            mDeceleration = getDeceleration(delta);
-            // TODO take velocity into account
-            mVelocity = -delta; // only sign is used
-            mOver = Math.abs(delta);
-            mDuration = (int) (1000.0 * Math.sqrt(-2.0 * delta / mDeceleration));
-        }
-
-        void fling(int start, int velocity, int min, int max, int over) {
-            mOver = over;
-            mFinished = false;
-            mCurrVelocity = mVelocity = velocity;
-            mDuration = mSplineDuration = 0;
-            mStartTime = AnimationUtils.currentAnimationTimeMillis();
-            mCurrentPosition = mStart = start;
-
-            if (start > max || start < min) {
-                startAfterEdge(start, min, max, velocity);
-                return;
-            }
-
-            mState = SPLINE;
-            double totalDistance = 0.0;
-
-            if (velocity != 0) {
-                mDuration = mSplineDuration = getSplineFlingDuration(velocity);
-                totalDistance = getSplineFlingDistance(velocity);
-            }
-
-            mSplineDistance = (int) (totalDistance * Math.signum(velocity));
-            mFinal = start + mSplineDistance;
-
-            // Clamp to a valid final position
-            if (mFinal < min) {
-                adjustDuration(mStart, mFinal, min);
-                mFinal = min;
-            }
-
-            if (mFinal > max) {
-                adjustDuration(mStart, mFinal, max);
-                mFinal = max;
-            }
-        }
-
-        private double getSplineDeceleration(int velocity) {
-            return Math.log(INFLEXION * Math.abs(velocity) / (mFlingFriction * mPhysicalCoeff));
-        }
-
-        private double getSplineFlingDistance(int velocity) {
-            final double l = getSplineDeceleration(velocity);
-            final double decelMinusOne = DECELERATION_RATE - 1.0;
-            return mFlingFriction * mPhysicalCoeff * Math.exp(DECELERATION_RATE / decelMinusOne * l);
-        }
-
-        /* Returns the duration, expressed in milliseconds */
-        private int getSplineFlingDuration(int velocity) {
-            final double l = getSplineDeceleration(velocity);
-            final double decelMinusOne = DECELERATION_RATE - 1.0;
-            return (int) (1000.0 * Math.exp(l / decelMinusOne));
-        }
-
-        private void fitOnBounceCurve(int start, int end, int velocity) {
-            // Simulate a bounce that started from edge
-            final float durationToApex = - velocity / mDeceleration;
-            // The float cast below is necessary to avoid integer overflow.
-            final float velocitySquared = (float) velocity * velocity;
-            final float distanceToApex = velocitySquared / 2.0f / Math.abs(mDeceleration);
-            final float distanceToEdge = Math.abs(end - start);
-            final float totalDuration = (float) Math.sqrt(
-                    2.0 * (distanceToApex + distanceToEdge) / Math.abs(mDeceleration));
-            mStartTime -= (int) (1000.0f * (totalDuration - durationToApex));
-            mCurrentPosition = mStart = end;
-            mVelocity = (int) (- mDeceleration * totalDuration);
-        }
-
-        private void startBounceAfterEdge(int start, int end, int velocity) {
-            mDeceleration = getDeceleration(velocity == 0 ? start - end : velocity);
-            fitOnBounceCurve(start, end, velocity);
-            onEdgeReached();
-        }
-
-        private void startAfterEdge(int start, int min, int max, int velocity) {
-            if (start > min && start < max) {
-                Log.e("OverScroller", "startAfterEdge called from a valid position");
-                mFinished = true;
-                return;
-            }
-            final boolean positive = start > max;
-            final int edge = positive ? max : min;
-            final int overDistance = start - edge;
-            boolean keepIncreasing = overDistance * velocity >= 0;
-            if (keepIncreasing) {
-                // Will result in a bounce or a to_boundary depending on velocity.
-                startBounceAfterEdge(start, edge, velocity);
-            } else {
-                final double totalDistance = getSplineFlingDistance(velocity);
-                if (totalDistance > Math.abs(overDistance)) {
-                    fling(start, velocity, positive ? min : start, positive ? start : max, mOver);
-                } else {
-                    startSpringback(start, edge, velocity);
-                }
-            }
-        }
-
-        void notifyEdgeReached(int start, int end, int over) {
-            // mState is used to detect successive notifications
-            if (mState == SPLINE) {
-                mOver = over;
-                mStartTime = AnimationUtils.currentAnimationTimeMillis();
-                // We were in fling/scroll mode before: current velocity is such that distance to
-                // edge is increasing. This ensures that startAfterEdge will not start a new fling.
-                startAfterEdge(start, end, end, (int) mCurrVelocity);
-            }
-        }
-
-        private void onEdgeReached() {
-            // mStart, mVelocity and mStartTime were adjusted to their values when edge was reached.
-            // The float cast below is necessary to avoid integer overflow.
-            final float velocitySquared = (float) mVelocity * mVelocity;
-            float distance = velocitySquared / (2.0f * Math.abs(mDeceleration));
-            final float sign = Math.signum(mVelocity);
-
-            if (distance > mOver) {
-                // Default deceleration is not sufficient to slow us down before boundary
-                mDeceleration = - sign * velocitySquared / (2.0f * mOver);
-                distance = mOver;
-            }
-
-            mOver = (int) distance;
-            mState = BALLISTIC;
-            mFinal = mStart + (int) (mVelocity > 0 ? distance : -distance);
-            mDuration = - (int) (1000.0f * mVelocity / mDeceleration);
-        }
-
-        boolean continueWhenFinished() {
-            switch (mState) {
-                case SPLINE:
-                    // Duration from start to null velocity
-                    if (mDuration < mSplineDuration) {
-                        // If the animation was clamped, we reached the edge
-                        mCurrentPosition = mStart = mFinal;
-                        // TODO Better compute speed when edge was reached
-                        mVelocity = (int) mCurrVelocity;
-                        mDeceleration = getDeceleration(mVelocity);
-                        mStartTime += mDuration;
-                        onEdgeReached();
-                    } else {
-                        // Normal stop, no need to continue
-                        return false;
-                    }
-                    break;
-                case BALLISTIC:
-                    mStartTime += mDuration;
-                    startSpringback(mFinal, mStart, 0);
-                    break;
-                case CUBIC:
-                    return false;
-            }
-
-            update();
-            return true;
-        }
-
-        /*
-         * Update the current position and velocity for current time. Returns
-         * true if update has been done and false if animation duration has been
-         * reached.
-         */
-        boolean update() {
-            if (mState == SPRING) {
-                return mFinished;
-            }
-
-            final long time = AnimationUtils.currentAnimationTimeMillis();
-            final long currentTime = time - mStartTime;
-
-            if (currentTime == 0) {
-                // Skip work but report that we're still going if we have a nonzero duration.
-                return mDuration > 0;
-            }
-            if (currentTime > mDuration) {
-                return false;
-            }
-
-            double distance = 0.0;
-            switch (mState) {
-                case SPLINE: {
-                    final float t = (float) currentTime / mSplineDuration;
-                    final int index = (int) (NB_SAMPLES * t);
-                    float distanceCoef = 1.f;
-                    float velocityCoef = 0.f;
-                    if (index < NB_SAMPLES) {
-                        final float t_inf = (float) index / NB_SAMPLES;
-                        final float t_sup = (float) (index + 1) / NB_SAMPLES;
-                        final float d_inf = SPLINE_POSITION[index];
-                        final float d_sup = SPLINE_POSITION[index + 1];
-                        velocityCoef = (d_sup - d_inf) / (t_sup - t_inf);
-                        distanceCoef = d_inf + (t - t_inf) * velocityCoef;
-                    }
-
-                    distance = distanceCoef * mSplineDistance;
-                    mCurrVelocity = velocityCoef * mSplineDistance / mSplineDuration * 1000.0f;
-                    break;
-                }
-
-                case BALLISTIC: {
-                    final float t = currentTime / 1000.0f;
-                    mCurrVelocity = mVelocity + mDeceleration * t;
-                    distance = mVelocity * t + mDeceleration * t * t / 2.0f;
-                    break;
-                }
-
-                case CUBIC: {
-                    final float t = (float) (currentTime) / mDuration;
-                    final float t2 = t * t;
-                    final float sign = Math.signum(mVelocity);
-                    distance = sign * mOver * (3.0f * t2 - 2.0f * t * t2);
-                    mCurrVelocity = sign * mOver * 6.0f * (- t + t2);
-                    break;
-                }
-            }
-
-            mCurrentPosition = mStart + (int) Math.round(distance);
-
-            return true;
-        }
-    }
-}

src/com/android/launcher3/util/OverlayEdgeEffect.java

@@ -0,0 +1,83 @@
+/*
+ * Copyright (C) 2021 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.util;
+
+import android.content.Context;
+import android.graphics.Canvas;
+import android.widget.EdgeEffect;
+
+import com.android.launcher3.Utilities;
+import com.android.systemui.plugins.shared.LauncherOverlayManager.LauncherOverlay;
+
+/**
+ * Extension of {@link EdgeEffect} which shows the Launcher overlay
+ */
+public class OverlayEdgeEffect extends EdgeEffectCompat {
+
+    private final LauncherOverlay mOverlay;
+    private final boolean mIsRtl;
+
+    private float mDistance;
+    private boolean mIsScrolling;
+
+    public OverlayEdgeEffect(Context context, LauncherOverlay overlay) {
+        super(context);
+        mOverlay = overlay;
+        mIsRtl = Utilities.isRtl(context.getResources());
+
+    }
+
+    @Override
+    public float getDistance() {
+        return mDistance;
+    }
+
+    public float onPullDistance(float deltaDistance, float displacement) {
+        mDistance = Math.max(0f, deltaDistance + mDistance);
+        if (!mIsScrolling) {
+            mOverlay.onScrollInteractionBegin();
+            mIsScrolling = true;
+        }
+        mOverlay.onScrollChange(mDistance, mIsRtl);
+        return mDistance > 0 ? deltaDistance : 0;
+    }
+
+    @Override
+    public void onAbsorb(int velocity) { }
+
+    @Override
+    public boolean isFinished() {
+        return mDistance <= 0;
+    }
+
+    @Override
+    public void onRelease() {
+        if (mIsScrolling) {
+            mDistance = 0;
+            mOverlay.onScrollInteractionEnd();
+            mIsScrolling = false;
+        }
+    }
+
+    @Override
+    public boolean draw(Canvas canvas) {
+        return false;
+    }
+
+    public void finish() {
+        mDistance = 0;
+    }
+}

src/com/android/launcher3/util/TranslateEdgeEffect.java

@@ -0,0 +1,50 @@
+/*
+ * Copyright (C) 2021 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.util;
+
+import android.content.Context;
+import android.graphics.Canvas;
+import android.graphics.RenderNode;
+import android.widget.EdgeEffect;
+
+/**
+ * Extension of {@link EdgeEffect} which translates the content instead of the default
+ * platform implementation
+ */
+@SuppressWarnings("NewApi")
+public class TranslateEdgeEffect extends EdgeEffectCompat {
+
+    private final RenderNode mNode;
+
+    public TranslateEdgeEffect(Context context) {
+        super(context);
+        mNode = new RenderNode("TranslateEdgeEffect");
+    }
+
+    @Override
+    public boolean draw(Canvas canvas) {
+        return false;
+    }
+
+    public boolean getTranslationShift(float[] out) {
+        Canvas c = mNode.beginRecording(1, 1);
+        boolean result = super.draw(c);
+        mNode.endRecording();
+
+        out[0] = getDistance();
+        return result;
+    }
+}