Remove unused ViewDragHelper.

Bug: 19641682
Change-Id: I148e0c8306e38bced6c5fd13182edb9625e80ff7

1 files changed, 0 insertions, 1574 deletions

diff --git a/src/com/android/dialer/widget/ViewDragHelper.java b/src/com/android/dialer/widget/ViewDragHelper.java
deleted file mode 100644
index fe3ab8230..000000000
--- a/src/com/android/dialer/widget/ViewDragHelper.java
+++ /dev/null
@@ -1,1574 +0,0 @@
-/*
- * Copyright (C) 2013 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.dialer.widget;
-
-import android.content.Context;
-import android.support.v4.view.MotionEventCompat;
-import android.support.v4.view.VelocityTrackerCompat;
-import android.support.v4.view.ViewCompat;
-import android.util.Log;
-import android.view.MotionEvent;
-import android.view.VelocityTracker;
-import android.view.View;
-import android.view.ViewConfiguration;
-import android.view.ViewGroup;
-import android.widget.Scroller;
-
-import java.util.Arrays;
-
-/**
- * ViewDragHelper is a utility class for writing custom ViewGroups. It offers a number
- * of useful operations and state tracking for allowing a user to drag and reposition
- * views within their parent ViewGroup.
- */
-public class ViewDragHelper {
-    private static final String TAG = "ViewDragHelper";
-
-    /**
-     * A null/invalid pointer ID.
-     */
-    public static final int INVALID_POINTER = -1;
-
-    /**
-     * A view is not currently being dragged or animating as a result of a fling/snap.
-     */
-    public static final int STATE_IDLE = 0;
-
-    /**
-     * A view is currently being dragged. The position is currently changing as a result
-     * of user input or simulated user input.
-     */
-    public static final int STATE_DRAGGING = 1;
-
-    /**
-     * A view is currently settling into place as a result of a fling or
-     * predefined non-interactive motion.
-     */
-    public static final int STATE_SETTLING = 2;
-
-    /**
-     * Edge flag indicating that the left edge should be affected.
-     */
-    public static final int EDGE_LEFT = 1 << 0;
-
-    /**
-     * Edge flag indicating that the right edge should be affected.
-     */
-    public static final int EDGE_RIGHT = 1 << 1;
-
-    /**
-     * Edge flag indicating that the top edge should be affected.
-     */
-    public static final int EDGE_TOP = 1 << 2;
-
-    /**
-     * Edge flag indicating that the bottom edge should be affected.
-     */
-    public static final int EDGE_BOTTOM = 1 << 3;
-
-    /**
-     * Edge flag set indicating all edges should be affected.
-     */
-    public static final int EDGE_ALL = EDGE_LEFT | EDGE_TOP | EDGE_RIGHT | EDGE_BOTTOM;
-
-    /**
-     * Indicates that a check should occur along the horizontal axis
-     */
-    public static final int DIRECTION_HORIZONTAL = 1 << 0;
-
-    /**
-     * Indicates that a check should occur along the vertical axis
-     */
-    public static final int DIRECTION_VERTICAL = 1 << 1;
-
-    /**
-     * Indicates that a check should occur along all axes
-     */
-    public static final int DIRECTION_ALL = DIRECTION_HORIZONTAL | DIRECTION_VERTICAL;
-
-    private static final int EDGE_SIZE = 20; // dp
-
-    private static final int BASE_SETTLE_DURATION = 256; // ms
-    private static final int MAX_SETTLE_DURATION = 600; // ms
-
-    // Current drag state; idle, dragging or settling
-    private int mDragState;
-
-    // Distance to travel before a drag may begin
-    private int mTouchSlop;
-
-    // Last known position/pointer tracking
-    private int mActivePointerId = INVALID_POINTER;
-    private float[] mInitialMotionX;
-    private float[] mInitialMotionY;
-    private float[] mLastMotionX;
-    private float[] mLastMotionY;
-    private int[] mInitialEdgesTouched;
-    private int[] mEdgeDragsInProgress;
-    private int[] mEdgeDragsLocked;
-    private int mPointersDown;
-
-    private VelocityTracker mVelocityTracker;
-    private float mMaxVelocity;
-    private float mMinVelocity;
-
-    private int mEdgeSize;
-    private int mTrackingEdges;
-
-    // We need to use a Scroller instead of an OverScroller (b/17700698) and as a result, we need
-    // to keep track of the final scroll position ourselves in mFinalScrollY (b/17704016) whenever
-    // we programmatically scroll or fling mScroller.
-    private Scroller mScroller;
-    private int mFinalScrollY;
-
-    private final Callback mCallback;
-
-    private View mCapturedView;
-    private boolean mReleaseInProgress;
-
-    private final ViewGroup mParentView;
-
-    /**
-     * A Callback is used as a communication channel with the ViewDragHelper back to the
-     * parent view using it. <code>on*</code>methods are invoked on siginficant events and several
-     * accessor methods are expected to provide the ViewDragHelper with more information
-     * about the state of the parent view upon request. The callback also makes decisions
-     * governing the range and draggability of child views.
-     */
-    public static abstract class Callback {
-        /**
-         * Called when the drag state changes. See the <code>STATE_*</code> constants
-         * for more information.
-         *
-         * @param state The new drag state
-         *
-         * @see #STATE_IDLE
-         * @see #STATE_DRAGGING
-         * @see #STATE_SETTLING
-         */
-        public void onViewDragStateChanged(int state) {}
-
-        /**
-         * Called when the captured view's position changes as the result of a drag or settle.
-         *
-         * @param changedView View whose position changed
-         * @param left New X coordinate of the left edge of the view
-         * @param top New Y coordinate of the top edge of the view
-         * @param dx Change in X position from the last call
-         * @param dy Change in Y position from the last call
-         */
-        public void onViewPositionChanged(View changedView, int left, int top, int dx, int dy) {}
-
-        /**
-         * Called when a child view is captured for dragging or settling. The ID of the pointer
-         * currently dragging the captured view is supplied. If activePointerId is
-         * identified as {@link #INVALID_POINTER} the capture is programmatic instead of
-         * pointer-initiated.
-         *
-         * @param capturedChild Child view that was captured
-         * @param activePointerId Pointer id tracking the child capture
-         */
-        public void onViewCaptured(View capturedChild, int activePointerId) {}
-
-        /**
-         * Called when the child view is no longer being actively dragged.
-         * The fling velocity is also supplied, if relevant. The velocity values may
-         * be clamped to system minimums or maximums.
-         *
-         * <p>Calling code may decide to fling or otherwise release the view to let it
-         * settle into place. It should do so using {@link #settleCapturedViewAt(int, int)}
-         * or {@link #flingCapturedView(int, int, int, int)}. If the Callback invokes
-         * one of these methods, the ViewDragHelper will enter {@link #STATE_SETTLING}
-         * and the view capture will not fully end until it comes to a complete stop.
-         * If neither of these methods is invoked before <code>onViewReleased</code> returns,
-         * the view will stop in place and the ViewDragHelper will return to
-         * {@link #STATE_IDLE}.</p>
-         *
-         * @param releasedChild The captured child view now being released
-         * @param xvel X velocity of the pointer as it left the screen in pixels per second.
-         * @param yvel Y velocity of the pointer as it left the screen in pixels per second.
-         */
-        public void onViewReleased(View releasedChild, float xvel, float yvel) {}
-
-        /**
-         * Called when the child view has been released with a fling.
-         *
-         * <p>Calling code may decide to fling or otherwise release the view to let it
-         * settle into place.</p>
-         *
-         * @param releasedChild The captured child view now being released
-         * @param xvel X velocity of the fling.
-         * @param yvel Y velocity of the fling.
-         */
-        public void onViewFling(View releasedChild, float xvel, float yvel) {}
-
-        /**
-         * Called when one of the subscribed edges in the parent view has been touched
-         * by the user while no child view is currently captured.
-         *
-         * @param edgeFlags A combination of edge flags describing the edge(s) currently touched
-         * @param pointerId ID of the pointer touching the described edge(s)
-         * @see #EDGE_LEFT
-         * @see #EDGE_TOP
-         * @see #EDGE_RIGHT
-         * @see #EDGE_BOTTOM
-         */
-        public void onEdgeTouched(int edgeFlags, int pointerId) {}
-
-        /**
-         * Called when the given edge may become locked. This can happen if an edge drag
-         * was preliminarily rejected before beginning, but after {@link #onEdgeTouched(int, int)}
-         * was called. This method should return true to lock this edge or false to leave it
-         * unlocked. The default behavior is to leave edges unlocked.
-         *
-         * @param edgeFlags A combination of edge flags describing the edge(s) locked
-         * @return true to lock the edge, false to leave it unlocked
-         */
-        public boolean onEdgeLock(int edgeFlags) {
-            return false;
-        }
-
-        /**
-         * Called when the user has started a deliberate drag away from one
-         * of the subscribed edges in the parent view while no child view is currently captured.
-         *
-         * @param edgeFlags A combination of edge flags describing the edge(s) dragged
-         * @param pointerId ID of the pointer touching the described edge(s)
-         * @see #EDGE_LEFT
-         * @see #EDGE_TOP
-         * @see #EDGE_RIGHT
-         * @see #EDGE_BOTTOM
-         */
-        public void onEdgeDragStarted(int edgeFlags, int pointerId) {}
-
-        /**
-         * Called to determine the Z-order of child views.
-         *
-         * @param index the ordered position to query for
-         * @return index of the view that should be ordered at position <code>index</code>
-         */
-        public int getOrderedChildIndex(int index) {
-            return index;
-        }
-
-        /**
-         * Return the magnitude of a draggable child view's horizontal range of motion in pixels.
-         * This method should return 0 for views that cannot move horizontally.
-         *
-         * @param child Child view to check
-         * @return range of horizontal motion in pixels
-         */
-        public int getViewHorizontalDragRange(View child) {
-            return 0;
-        }
-
-        /**
-         * Return the magnitude of a draggable child view's vertical range of motion in pixels.
-         * This method should return 0 for views that cannot move vertically.
-         *
-         * @param child Child view to check
-         * @return range of vertical motion in pixels
-         */
-        public int getViewVerticalDragRange(View child) {
-            return 0;
-        }
-
-        /**
-         * Called when the user's input indicates that they want to capture the given child view
-         * with the pointer indicated by pointerId. The callback should return true if the user
-         * is permitted to drag the given view with the indicated pointer.
-         *
-         * <p>ViewDragHelper may call this method multiple times for the same view even if
-         * the view is already captured; this indicates that a new pointer is trying to take
-         * control of the view.</p>
-         *
-         * <p>If this method returns true, a call to {@link #onViewCaptured(android.view.View, int)}
-         * will follow if the capture is successful.</p>
-         *
-         * @param child Child the user is attempting to capture
-         * @param pointerId ID of the pointer attempting the capture
-         * @return true if capture should be allowed, false otherwise
-         */
-        public abstract boolean tryCaptureView(View child, int pointerId);
-
-        /**
-         * Restrict the motion of the dragged child view along the horizontal axis.
-         * The default implementation does not allow horizontal motion; the extending
-         * class must override this method and provide the desired clamping.
-         *
-         *
-         * @param child Child view being dragged
-         * @param left Attempted motion along the X axis
-         * @param dx Proposed change in position for left
-         * @return The new clamped position for left
-         */
-        public int clampViewPositionHorizontal(View child, int left, int dx) {
-            return 0;
-        }
-
-        /**
-         * Restrict the motion of the dragged child view along the vertical axis.
-         * The default implementation does not allow vertical motion; the extending
-         * class must override this method and provide the desired clamping.
-         *
-         *
-         * @param child Child view being dragged
-         * @param top Attempted motion along the Y axis
-         * @param dy Proposed change in position for top
-         * @return The new clamped position for top
-         */
-        public int clampViewPositionVertical(View child, int top, int dy) {
-            return 0;
-        }
-    }
-
-    private final Runnable mSetIdleRunnable = new Runnable() {
-        public void run() {
-            setDragState(STATE_IDLE);
-        }
-    };
-
-    /**
-     * Factory method to create a new ViewDragHelper.
-     *
-     * @param forParent Parent view to monitor
-     * @param cb Callback to provide information and receive events
-     * @return a new ViewDragHelper instance
-     */
-    public static ViewDragHelper create(ViewGroup forParent, Callback cb) {
-        return new ViewDragHelper(forParent.getContext(), forParent, cb);
-    }
-
-    /**
-     * Factory method to create a new ViewDragHelper.
-     *
-     * @param forParent Parent view to monitor
-     * @param sensitivity Multiplier for how sensitive the helper should be about detecting
-     *                    the start of a drag. Larger values are more sensitive. 1.0f is normal.
-     * @param cb Callback to provide information and receive events
-     * @return a new ViewDragHelper instance
-     */
-    public static ViewDragHelper create(ViewGroup forParent, float sensitivity, Callback cb) {
-        final ViewDragHelper helper = create(forParent, cb);
-        helper.mTouchSlop = (int) (helper.mTouchSlop * (1 / sensitivity));
-        return helper;
-    }
-
-    /**
-     * Apps should use ViewDragHelper.create() to get a new instance.
-     * This will allow VDH to use internal compatibility implementations for different
-     * platform versions.
-     *
-     * @param context Context to initialize config-dependent params from
-     * @param forParent Parent view to monitor
-     */
-    private ViewDragHelper(Context context, ViewGroup forParent, Callback cb) {
-        if (forParent == null) {
-            throw new IllegalArgumentException("Parent view may not be null");
-        }
-        if (cb == null) {
-            throw new IllegalArgumentException("Callback may not be null");
-        }
-
-        mParentView = forParent;
-        mCallback = cb;
-
-        final ViewConfiguration vc = ViewConfiguration.get(context);
-        final float density = context.getResources().getDisplayMetrics().density;
-        mEdgeSize = (int) (EDGE_SIZE * density + 0.5f);
-
-        mTouchSlop = vc.getScaledTouchSlop();
-        mMaxVelocity = vc.getScaledMaximumFlingVelocity();
-        mMinVelocity = vc.getScaledMinimumFlingVelocity();
-        mScroller = new Scroller(context);
-    }
-
-    /**
-     * Set the minimum velocity that will be detected as having a magnitude greater than zero
-     * in pixels per second. Callback methods accepting a velocity will be clamped appropriately.
-     *
-     * @param minVel Minimum velocity to detect
-     */
-    public void setMinVelocity(float minVel) {
-        mMinVelocity = minVel;
-    }
-
-    /**
-     * Return the currently configured minimum velocity. Any flings with a magnitude less
-     * than this value in pixels per second. Callback methods accepting a velocity will receive
-     * zero as a velocity value if the real detected velocity was below this threshold.
-     *
-     * @return the minimum velocity that will be detected
-     */
-    public float getMinVelocity() {
-        return mMinVelocity;
-    }
-
-    /**
-     * Retrieve the current drag state of this helper. This will return one of
-     * {@link #STATE_IDLE}, {@link #STATE_DRAGGING} or {@link #STATE_SETTLING}.
-     * @return The current drag state
-     */
-    public int getViewDragState() {
-        return mDragState;
-    }
-
-    /**
-     * Enable edge tracking for the selected edges of the parent view.
-     * The callback's {@link Callback#onEdgeTouched(int, int)} and
-     * {@link Callback#onEdgeDragStarted(int, int)} methods will only be invoked
-     * for edges for which edge tracking has been enabled.
-     *
-     * @param edgeFlags Combination of edge flags describing the edges to watch
-     * @see #EDGE_LEFT
-     * @see #EDGE_TOP
-     * @see #EDGE_RIGHT
-     * @see #EDGE_BOTTOM
-     */
-    public void setEdgeTrackingEnabled(int edgeFlags) {
-        mTrackingEdges = edgeFlags;
-    }
-
-    /**
-     * Return the size of an edge. This is the range in pixels along the edges of this view
-     * that will actively detect edge touches or drags if edge tracking is enabled.
-     *
-     * @return The size of an edge in pixels
-     * @see #setEdgeTrackingEnabled(int)
-     */
-    public int getEdgeSize() {
-        return mEdgeSize;
-    }
-
-    /**
-     * Capture a specific child view for dragging within the parent. The callback will be notified
-     * but {@link Callback#tryCaptureView(android.view.View, int)} will not be asked permission to
-     * capture this view.
-     *
-     * @param childView Child view to capture
-     * @param activePointerId ID of the pointer that is dragging the captured child view
-     */
-    public void captureChildView(View childView, int activePointerId) {
-        if (childView.getParent() != mParentView) {
-            throw new IllegalArgumentException("captureChildView: parameter must be a descendant " +
-                    "of the ViewDragHelper's tracked parent view (" + mParentView + ")");
-        }
-
-        mCapturedView = childView;
-        mActivePointerId = activePointerId;
-        mCallback.onViewCaptured(childView, activePointerId);
-        setDragState(STATE_DRAGGING);
-    }
-
-    /**
-     * @return The currently captured view, or null if no view has been captured.
-     */
-    public View getCapturedView() {
-        return mCapturedView;
-    }
-
-    /**
-     * @return The ID of the pointer currently dragging the captured view,
-     *         or {@link #INVALID_POINTER}.
-     */
-    public int getActivePointerId() {
-        return mActivePointerId;
-    }
-
-    /**
-     * @return The minimum distance in pixels that the user must travel to initiate a drag
-     */
-    public int getTouchSlop() {
-        return mTouchSlop;
-    }
-
-    /**
-     * The result of a call to this method is equivalent to
-     * {@link #processTouchEvent(android.view.MotionEvent)} receiving an ACTION_CANCEL event.
-     */
-    public void cancel() {
-        mActivePointerId = INVALID_POINTER;
-        clearMotionHistory();
-
-        if (mVelocityTracker != null) {
-            mVelocityTracker.recycle();
-            mVelocityTracker = null;
-        }
-    }
-
-    /**
-     * {@link #cancel()}, but also abort all motion in progress and snap to the end of any
-     * animation.
-     */
-    public void abort() {
-        cancel();
-        if (mDragState == STATE_SETTLING) {
-            final int oldX = mScroller.getCurrX();
-            final int oldY = mScroller.getCurrY();
-            mScroller.abortAnimation();
-            final int newX = mScroller.getCurrX();
-            final int newY = mScroller.getCurrY();
-            mCallback.onViewPositionChanged(mCapturedView, newX, newY, newX - oldX, newY - oldY);
-        }
-        setDragState(STATE_IDLE);
-    }
-
-    /**
-     * Animate the view <code>child</code> to the given (left, top) position.
-     * If this method returns true, the caller should invoke {@link #continueSettling(boolean)}
-     * on each subsequent frame to continue the motion until it returns false. If this method
-     * returns false there is no further work to do to complete the movement.
-     *
-     * <p>This operation does not count as a capture event, though {@link #getCapturedView()}
-     * will still report the sliding view while the slide is in progress.</p>
-     *
-     * @param child Child view to capture and animate
-     * @param finalLeft Final left position of child
-     * @param finalTop Final top position of child
-     * @return true if animation should continue through {@link #continueSettling(boolean)} calls
-     */
-    public boolean smoothSlideViewTo(View child, int finalLeft, int finalTop) {
-        mCapturedView = child;
-        mActivePointerId = INVALID_POINTER;
-
-        return forceSettleCapturedViewAt(finalLeft, finalTop, 0, 0);
-    }
-
-    /**
-     * Settle the captured view at the given (left, top) position.
-     * The appropriate velocity from prior motion will be taken into account.
-     * If this method returns true, the caller should invoke {@link #continueSettling(boolean)}
-     * on each subsequent frame to continue the motion until it returns false. If this method
-     * returns false there is no further work to do to complete the movement.
-     *
-     * @param finalLeft Settled left edge position for the captured view
-     * @param finalTop Settled top edge position for the captured view
-     * @return true if animation should continue through {@link #continueSettling(boolean)} calls
-     */
-    public boolean settleCapturedViewAt(int finalLeft, int finalTop) {
-        if (!mReleaseInProgress) {
-            throw new IllegalStateException("Cannot settleCapturedViewAt outside of a call to " +
-                    "Callback#onViewReleased");
-        }
-
-        return forceSettleCapturedViewAt(finalLeft, finalTop,
-                (int) VelocityTrackerCompat.getXVelocity(mVelocityTracker, mActivePointerId),
-                (int) VelocityTrackerCompat.getYVelocity(mVelocityTracker, mActivePointerId));
-    }
-
-    /**
-     * Settle the captured view at the given (left, top) position.
-     *
-     * @param finalLeft Target left position for the captured view
-     * @param finalTop Target top position for the captured view
-     * @param xvel Horizontal velocity
-     * @param yvel Vertical velocity
-     * @return true if animation should continue through {@link #continueSettling(boolean)} calls
-     */
-    private boolean forceSettleCapturedViewAt(int finalLeft, int finalTop, int xvel, int yvel) {
-        final int startLeft = mCapturedView.getLeft();
-        final int startTop = mCapturedView.getTop();
-        final int dx = finalLeft - startLeft;
-        final int dy = finalTop - startTop;
-
-        if (dx == 0 && dy == 0) {
-            // Nothing to do. Send callbacks, be done.
-            mScroller.abortAnimation();
-            setDragState(STATE_IDLE);
-            return false;
-        }
-
-        final int duration = computeSettleDuration(mCapturedView, dx, dy, xvel, yvel);
-        mScroller.startScroll(startLeft, startTop, dx, dy, duration);
-        mFinalScrollY = startTop + dy;
-
-        setDragState(STATE_SETTLING);
-        return true;
-    }
-
-    private int computeSettleDuration(View child, int dx, int dy, int xvel, int yvel) {
-        xvel = clampMag(xvel, (int) mMinVelocity, (int) mMaxVelocity);
-        yvel = clampMag(yvel, (int) mMinVelocity, (int) mMaxVelocity);
-        final int absDx = Math.abs(dx);
-        final int absDy = Math.abs(dy);
-        final int absXVel = Math.abs(xvel);
-        final int absYVel = Math.abs(yvel);
-        final int addedVel = absXVel + absYVel;
-        final int addedDistance = absDx + absDy;
-
-        final float xweight = xvel != 0 ? (float) absXVel / addedVel :
-                (float) absDx / addedDistance;
-        final float yweight = yvel != 0 ? (float) absYVel / addedVel :
-                (float) absDy / addedDistance;
-
-        int xduration = computeAxisDuration(dx, xvel, mCallback.getViewHorizontalDragRange(child));
-        int yduration = computeAxisDuration(dy, yvel, mCallback.getViewVerticalDragRange(child));
-
-        return (int) (xduration * xweight + yduration * yweight);
-    }
-
-    private int computeAxisDuration(int delta, int velocity, int motionRange) {
-        if (delta == 0) {
-            return 0;
-        }
-
-        final int width = mParentView.getWidth();
-        final int halfWidth = width / 2;
-        final float distanceRatio = Math.min(1f, (float) Math.abs(delta) / width);
-        final float distance = halfWidth + halfWidth *
-                distanceInfluenceForSnapDuration(distanceRatio);
-
-        int duration;
-        velocity = Math.abs(velocity);
-        if (velocity > 0) {
-            duration = 4 * Math.round(1000 * Math.abs(distance / velocity));
-        } else {
-            final float range = (float) Math.abs(delta) / motionRange;
-            duration = (int) ((range + 1) * BASE_SETTLE_DURATION);
-        }
-        return Math.min(duration, MAX_SETTLE_DURATION);
-    }
-
-    /**
-     * Clamp the magnitude of value for absMin and absMax.
-     * If the value is below the minimum, it will be clamped to zero.
-     * If the value is above the maximum, it will be clamped to the maximum.
-     *
-     * @param value Value to clamp
-     * @param absMin Absolute value of the minimum significant value to return
-     * @param absMax Absolute value of the maximum value to return
-     * @return The clamped value with the same sign as <code>value</code>
-     */
-    private int clampMag(int value, int absMin, int absMax) {
-        final int absValue = Math.abs(value);
-        if (absValue < absMin) return 0;
-        if (absValue > absMax) return value > 0 ? absMax : -absMax;
-        return value;
-    }
-
-    /**
-     * Clamp the magnitude of value for absMin and absMax.
-     * If the value is below the minimum, it will be clamped to zero.
-     * If the value is above the maximum, it will be clamped to the maximum.
-     *
-     * @param value Value to clamp
-     * @param absMin Absolute value of the minimum significant value to return
-     * @param absMax Absolute value of the maximum value to return
-     * @return The clamped value with the same sign as <code>value</code>
-     */
-    private float clampMag(float value, float absMin, float absMax) {
-        final float absValue = Math.abs(value);
-        if (absValue < absMin) return 0;
-        if (absValue > absMax) return value > 0 ? absMax : -absMax;
-        return value;
-    }
-
-    private float distanceInfluenceForSnapDuration(float f) {
-        f -= 0.5f; // center the values about 0.
-        f *= 0.3f * Math.PI / 2.0f;
-        return (float) Math.sin(f);
-    }
-
-    /**
-     * Settle the captured view based on standard free-moving fling behavior.
-     * The caller should invoke {@link #continueSettling(boolean)} on each subsequent frame
-     * to continue the motion until it returns false.
-     *
-     * @param minLeft Minimum X position for the view's left edge
-     * @param minTop Minimum Y position for the view's top edge
-     * @param maxLeft Maximum X position for the view's left edge
-     * @param maxTop Maximum Y position for the view's top edge
-     */
-    public void flingCapturedView(int minLeft, int minTop, int maxLeft, int maxTop) {
-        if (!mReleaseInProgress) {
-            throw new IllegalStateException("Cannot flingCapturedView outside of a call to " +
-                    "Callback#onViewReleased");
-        }
-
-        final int yVelocity = (int) VelocityTrackerCompat
-                .getYVelocity(mVelocityTracker, mActivePointerId);
-        mScroller.fling(mCapturedView.getLeft(), mCapturedView.getTop(),
-                (int) VelocityTrackerCompat.getXVelocity(mVelocityTracker, mActivePointerId),
-                yVelocity, minLeft, maxLeft, minTop, maxTop);
-        mFinalScrollY = yVelocity < 0 ? minTop : maxTop;
-
-        setDragState(STATE_SETTLING);
-    }
-
-    /**
-     * Settle the captured view based on standard free-moving fling behavior.
-     * The caller should invoke {@link #continueSettling(boolean)} on each subsequent frame
-     * to continue the motion until it returns false.
-     *
-     * @param minLeft Minimum X position for the view's left edge
-     * @param minTop Minimum Y position for the view's top edge
-     * @param maxLeft Maximum X position for the view's left edge
-     * @param maxTop Maximum Y position for the view's top edge
-     * @param yvel the Y velocity to fling with
-     */
-    public void flingCapturedView(int minLeft, int minTop, int maxLeft, int maxTop, int yvel) {
-        if (!mReleaseInProgress) {
-            throw new IllegalStateException("Cannot flingCapturedView outside of a call to " +
-                    "Callback#onViewReleased");
-        }
-        mScroller.abortAnimation();
-        mScroller.fling(mCapturedView.getLeft(), mCapturedView.getTop(), 0, yvel,
-                Integer.MIN_VALUE, Integer.MAX_VALUE, Integer.MIN_VALUE, Integer.MAX_VALUE);
-        mFinalScrollY = yvel < 0 ? minTop : maxTop;
-
-        setDragState(STATE_SETTLING);
-    }
-
-    /**
-     * Predict how far a fling with {@param yvel} will cause the view to travel from stand still.
-     * @return predicted y offset
-     */
-    public int predictFlingYOffset(int yvel) {
-        mScroller.abortAnimation();
-        mScroller.fling(0, 0, 0, yvel, Integer.MIN_VALUE, Integer.MAX_VALUE, Integer.MIN_VALUE,
-                Integer.MAX_VALUE);
-        final int finalY = mScroller.getFinalY();
-        mScroller.abortAnimation();
-        return finalY;
-    }
-
-    /**
-     * Move the captured settling view by the appropriate amount for the current time.
-     * If <code>continueSettling</code> returns true, the caller should call it again
-     * on the next frame to continue.
-     *
-     * @param deferCallbacks true if state callbacks should be deferred via posted message.
-     *                       Set this to true if you are calling this method from
-     *                       {@link android.view.View#computeScroll()} or similar methods
-     *                       invoked as part of layout or drawing.
-     * @return true if settle is still in progress
-     */
-    public boolean continueSettling(boolean deferCallbacks) {
-        if (mDragState == STATE_SETTLING) {
-            boolean keepGoing = mScroller.computeScrollOffset();
-            int y = mScroller.getCurrY();
-
-            // Since Scroller's getFinalY() can't be properly set (b/17704016), we need to
-            // perform clamping of mScroller.getCurrY() here.
-            if (y - mCapturedView.getTop() > 0) {
-                y = Math.min(y, mFinalScrollY);
-            } else {
-                y = Math.max(y, mFinalScrollY);
-            }
-            final int dy = y - mCapturedView.getTop();
-
-            if (dy != 0) {
-                mCapturedView.offsetTopAndBottom(dy);
-                mCallback.onViewPositionChanged(mCapturedView, 0, y, 0, dy);
-            }
-
-            if (keepGoing && y == mFinalScrollY) {
-                // Close enough. The interpolator/scroller might think we're still moving
-                // but the user sure doesn't.
-                mScroller.abortAnimation();
-                keepGoing = mScroller.isFinished();
-            }
-
-            if (!keepGoing) {
-                if (deferCallbacks) {
-                    mParentView.post(mSetIdleRunnable);
-                } else {
-                    setDragState(STATE_IDLE);
-                }
-            }
-        }
-
-        return mDragState == STATE_SETTLING;
-    }
-
-    public void processNestedFling(View target, int yvel) {
-        mCapturedView = target;
-        dispatchViewFling(0, yvel);
-    }
-
-    public int getVelocityMagnitude() {
-        // Use Math.abs() to ensure this always returns an absolute value, even if the
-        // ScrollerCompat implementation changes.
-        return (int) Math.abs(mScroller.getCurrVelocity());
-    }
-
-    private void dispatchViewFling(float xvel, float yvel) {
-        mReleaseInProgress = true;
-        mCallback.onViewFling(mCapturedView, xvel, yvel);
-        mReleaseInProgress = false;
-
-        if (mDragState == STATE_DRAGGING) {
-            // onViewReleased didn't call a method that would have changed this. Go idle.
-            setDragState(STATE_IDLE);
-        }
-    }
-
-    /**
-     * Like all callback events this must happen on the UI thread, but release
-     * involves some extra semantics. During a release (mReleaseInProgress)
-     * is the only time it is valid to call {@link #settleCapturedViewAt(int, int)}
-     * or {@link #flingCapturedView(int, int, int, int)}.
-     */
-    private void dispatchViewReleased(float xvel, float yvel) {
-        mReleaseInProgress = true;
-        mCallback.onViewReleased(mCapturedView, xvel, yvel);
-        mReleaseInProgress = false;
-
-        if (mDragState == STATE_DRAGGING) {
-            // onViewReleased didn't call a method that would have changed this. Go idle.
-            setDragState(STATE_IDLE);
-        }
-    }
-
-    private void clearMotionHistory() {
-        if (mInitialMotionX == null) {
-            return;
-        }
-        Arrays.fill(mInitialMotionX, 0);
-        Arrays.fill(mInitialMotionY, 0);
-        Arrays.fill(mLastMotionX, 0);
-        Arrays.fill(mLastMotionY, 0);
-        Arrays.fill(mInitialEdgesTouched, 0);
-        Arrays.fill(mEdgeDragsInProgress, 0);
-        Arrays.fill(mEdgeDragsLocked, 0);
-        mPointersDown = 0;
-    }
-
-    private void clearMotionHistory(int pointerId) {
-        if (mInitialMotionX == null) {
-            return;
-        }
-        mInitialMotionX[pointerId] = 0;
-        mInitialMotionY[pointerId] = 0;
-        mLastMotionX[pointerId] = 0;
-        mLastMotionY[pointerId] = 0;
-        mInitialEdgesTouched[pointerId] = 0;
-        mEdgeDragsInProgress[pointerId] = 0;
-        mEdgeDragsLocked[pointerId] = 0;
-        mPointersDown &= ~(1 << pointerId);
-    }
-
-    private void ensureMotionHistorySizeForId(int pointerId) {
-        if (mInitialMotionX == null || mInitialMotionX.length <= pointerId) {
-            float[] imx = new float[pointerId + 1];
-            float[] imy = new float[pointerId + 1];
-            float[] lmx = new float[pointerId + 1];
-            float[] lmy = new float[pointerId + 1];
-            int[] iit = new int[pointerId + 1];
-            int[] edip = new int[pointerId + 1];
-            int[] edl = new int[pointerId + 1];
-
-            if (mInitialMotionX != null) {
-                System.arraycopy(mInitialMotionX, 0, imx, 0, mInitialMotionX.length);
-                System.arraycopy(mInitialMotionY, 0, imy, 0, mInitialMotionY.length);
-                System.arraycopy(mLastMotionX, 0, lmx, 0, mLastMotionX.length);
-                System.arraycopy(mLastMotionY, 0, lmy, 0, mLastMotionY.length);
-                System.arraycopy(mInitialEdgesTouched, 0, iit, 0, mInitialEdgesTouched.length);
-                System.arraycopy(mEdgeDragsInProgress, 0, edip, 0, mEdgeDragsInProgress.length);
-                System.arraycopy(mEdgeDragsLocked, 0, edl, 0, mEdgeDragsLocked.length);
-            }
-
-            mInitialMotionX = imx;
-            mInitialMotionY = imy;
-            mLastMotionX = lmx;
-            mLastMotionY = lmy;
-            mInitialEdgesTouched = iit;
-            mEdgeDragsInProgress = edip;
-            mEdgeDragsLocked = edl;
-        }
-    }
-
-    private void saveInitialMotion(float x, float y, int pointerId) {
-        ensureMotionHistorySizeForId(pointerId);
-        mInitialMotionX[pointerId] = mLastMotionX[pointerId] = x;
-        mInitialMotionY[pointerId] = mLastMotionY[pointerId] = y;
-        mInitialEdgesTouched[pointerId] = getEdgesTouched((int) x, (int) y);
-        mPointersDown |= 1 << pointerId;
-    }
-
-    private void saveLastMotion(MotionEvent ev) {
-        final int pointerCount = MotionEventCompat.getPointerCount(ev);
-        for (int i = 0; i < pointerCount; i++) {
-            final int pointerId = MotionEventCompat.getPointerId(ev, i);
-            final float x = MotionEventCompat.getX(ev, i);
-            final float y = MotionEventCompat.getY(ev, i);
-            mLastMotionX[pointerId] = x;
-            mLastMotionY[pointerId] = y;
-        }
-    }
-
-    /**
-     * Check if the given pointer ID represents a pointer that is currently down (to the best
-     * of the ViewDragHelper's knowledge).
-     *
-     * <p>The state used to report this information is populated by the methods
-     * {@link #shouldInterceptTouchEvent(android.view.MotionEvent)} or
-     * {@link #processTouchEvent(android.view.MotionEvent)}. If one of these methods has not
-     * been called for all relevant MotionEvents to track, the information reported
-     * by this method may be stale or incorrect.</p>
-     *
-     * @param pointerId pointer ID to check; corresponds to IDs provided by MotionEvent
-     * @return true if the pointer with the given ID is still down
-     */
-    public boolean isPointerDown(int pointerId) {
-        return (mPointersDown & 1 << pointerId) != 0;
-    }
-
-    void setDragState(int state) {
-        if (mDragState != state) {
-            mDragState = state;
-            mCallback.onViewDragStateChanged(state);
-            if (state == STATE_IDLE) {
-                mCapturedView = null;
-            }
-        }
-    }
-
-    /**
-     * Attempt to capture the view with the given pointer ID. The callback will be involved.
-     * This will put us into the "dragging" state. If we've already captured this view with
-     * this pointer this method will immediately return true without consulting the callback.
-     *
-     * @param toCapture View to capture
-     * @param pointerId Pointer to capture with
-     * @return true if capture was successful
-     */
-    boolean tryCaptureViewForDrag(View toCapture, int pointerId) {
-        if (toCapture == mCapturedView && mActivePointerId == pointerId) {
-            // Already done!
-            return true;
-        }
-        if (toCapture != null && mCallback.tryCaptureView(toCapture, pointerId)) {
-            mActivePointerId = pointerId;
-            captureChildView(toCapture, pointerId);
-            return true;
-        }
-        return false;
-    }
-
-    /**
-     * Tests scrollability within child views of v given a delta of dx.
-     *
-     * @param v View to test for horizontal scrollability
-     * @param checkV Whether the view v passed should itself be checked for scrollability (true),
-     *               or just its children (false).
-     * @param dx Delta scrolled in pixels along the X axis
-     * @param dy Delta scrolled in pixels along the Y axis
-     * @param x X coordinate of the active touch point
-     * @param y Y coordinate of the active touch point
-     * @return true if child views of v can be scrolled by delta of dx.
-     */
-    protected boolean canScroll(View v, boolean checkV, int dx, int dy, int x, int y) {
-        if (v instanceof ViewGroup) {
-            final ViewGroup group = (ViewGroup) v;
-            final int scrollX = v.getScrollX();
-            final int scrollY = v.getScrollY();
-            final int count = group.getChildCount();
-            // Count backwards - let topmost views consume scroll distance first.
-            for (int i = count - 1; i >= 0; i--) {
-                // TODO: Add versioned support here for transformed views.
-                // This will not work for transformed views in Honeycomb+
-                final View child = group.getChildAt(i);
-                if (x + scrollX >= child.getLeft() && x + scrollX < child.getRight() &&
-                        y + scrollY >= child.getTop() && y + scrollY < child.getBottom() &&
-                        canScroll(child, true, dx, dy, x + scrollX - child.getLeft(),
-                                y + scrollY - child.getTop())) {
-                    return true;
-                }
-            }
-        }
-
-        return checkV && (ViewCompat.canScrollHorizontally(v, -dx) ||
-                ViewCompat.canScrollVertically(v, -dy));
-    }
-
-    /**
-     * Check if this event as provided to the parent view's onInterceptTouchEvent should
-     * cause the parent to intercept the touch event stream.
-     *
-     * @param ev MotionEvent provided to onInterceptTouchEvent
-     * @return true if the parent view should return true from onInterceptTouchEvent
-     */
-    public boolean shouldInterceptTouchEvent(MotionEvent ev) {
-        final int action = MotionEventCompat.getActionMasked(ev);
-        final int actionIndex = MotionEventCompat.getActionIndex(ev);
-
-        if (action == MotionEvent.ACTION_DOWN) {
-            // Reset things for a new event stream, just in case we didn't get
-            // the whole previous stream.
-            cancel();
-        }
-
-        if (mVelocityTracker == null) {
-            mVelocityTracker = VelocityTracker.obtain();
-        }
-        mVelocityTracker.addMovement(ev);
-
-        switch (action) {
-            case MotionEvent.ACTION_DOWN: {
-                final float x = ev.getX();
-                final float y = ev.getY();
-                final int pointerId = MotionEventCompat.getPointerId(ev, 0);
-                saveInitialMotion(x, y, pointerId);
-
-                final View toCapture = findTopChildUnder((int) x, (int) y);
-
-                // Catch a settling view if possible.
-                if (toCapture == mCapturedView && mDragState == STATE_SETTLING) {
-                    tryCaptureViewForDrag(toCapture, pointerId);
-                }
-
-                final int edgesTouched = mInitialEdgesTouched[pointerId];
-                if ((edgesTouched & mTrackingEdges) != 0) {
-                    mCallback.onEdgeTouched(edgesTouched & mTrackingEdges, pointerId);
-                }
-                break;
-            }
-
-            case MotionEventCompat.ACTION_POINTER_DOWN: {
-                final int pointerId = MotionEventCompat.getPointerId(ev, actionIndex);
-                final float x = MotionEventCompat.getX(ev, actionIndex);
-                final float y = MotionEventCompat.getY(ev, actionIndex);
-
-                saveInitialMotion(x, y, pointerId);
-
-                // A ViewDragHelper can only manipulate one view at a time.
-                if (mDragState == STATE_IDLE) {
-                    final int edgesTouched = mInitialEdgesTouched[pointerId];
-                    if ((edgesTouched & mTrackingEdges) != 0) {
-                        mCallback.onEdgeTouched(edgesTouched & mTrackingEdges, pointerId);
-                    }
-                } else if (mDragState == STATE_SETTLING) {
-                    // Catch a settling view if possible.
-                    final View toCapture = findTopChildUnder((int) x, (int) y);
-                    if (toCapture == mCapturedView) {
-                        tryCaptureViewForDrag(toCapture, pointerId);
-                    }
-                }
-                break;
-            }
-
-            case MotionEvent.ACTION_MOVE: {
-                // First to cross a touch slop over a draggable view wins. Also report edge drags.
-                final int pointerCount = MotionEventCompat.getPointerCount(ev);
-                for (int i = 0; i < pointerCount; i++) {
-                    final int pointerId = MotionEventCompat.getPointerId(ev, i);
-                    final float x = MotionEventCompat.getX(ev, i);
-                    final float y = MotionEventCompat.getY(ev, i);
-                    final float dx = x - mInitialMotionX[pointerId];
-                    final float dy = y - mInitialMotionY[pointerId];
-
-                    reportNewEdgeDrags(dx, dy, pointerId);
-                    if (mDragState == STATE_DRAGGING) {
-                        // Callback might have started an edge drag
-                        break;
-                    }
-
-                    final View toCapture = findTopChildUnder((int) x, (int) y);
-                    if (toCapture != null && checkTouchSlop(toCapture, dx, dy) &&
-                            tryCaptureViewForDrag(toCapture, pointerId)) {
-                        break;
-                    }
-                }
-                saveLastMotion(ev);
-                break;
-            }
-
-            case MotionEventCompat.ACTION_POINTER_UP: {
-                final int pointerId = MotionEventCompat.getPointerId(ev, actionIndex);
-                clearMotionHistory(pointerId);
-                break;
-            }
-
-            case MotionEvent.ACTION_UP:
-            case MotionEvent.ACTION_CANCEL: {
-                cancel();
-                break;
-            }
-        }
-
-        return mDragState == STATE_DRAGGING;
-    }
-
-    /**
-     * Process a touch event received by the parent view. This method will dispatch callback events
-     * as needed before returning. The parent view's onTouchEvent implementation should call this.
-     *
-     * @param ev The touch event received by the parent view
-     */
-    public void processTouchEvent(MotionEvent ev) {
-        final int action = MotionEventCompat.getActionMasked(ev);
-        final int actionIndex = MotionEventCompat.getActionIndex(ev);
-
-        if (action == MotionEvent.ACTION_DOWN) {
-            // Reset things for a new event stream, just in case we didn't get
-            // the whole previous stream.
-            cancel();
-        }
-
-        if (mVelocityTracker == null) {
-            mVelocityTracker = VelocityTracker.obtain();
-        }
-        mVelocityTracker.addMovement(ev);
-
-        switch (action) {
-            case MotionEvent.ACTION_DOWN: {
-                final float x = ev.getX();
-                final float y = ev.getY();
-                final int pointerId = MotionEventCompat.getPointerId(ev, 0);
-                final View toCapture = findTopChildUnder((int) x, (int) y);
-
-                saveInitialMotion(x, y, pointerId);
-
-                // Since the parent is already directly processing this touch event,
-                // there is no reason to delay for a slop before dragging.
-                // Start immediately if possible.
-                tryCaptureViewForDrag(toCapture, pointerId);
-
-                final int edgesTouched = mInitialEdgesTouched[pointerId];
-                if ((edgesTouched & mTrackingEdges) != 0) {
-                    mCallback.onEdgeTouched(edgesTouched & mTrackingEdges, pointerId);
-                }
-                break;
-            }
-
-            case MotionEventCompat.ACTION_POINTER_DOWN: {
-                final int pointerId = MotionEventCompat.getPointerId(ev, actionIndex);
-                final float x = MotionEventCompat.getX(ev, actionIndex);
-                final float y = MotionEventCompat.getY(ev, actionIndex);
-
-                saveInitialMotion(x, y, pointerId);
-
-                // A ViewDragHelper can only manipulate one view at a time.
-                if (mDragState == STATE_IDLE) {
-                    // If we're idle we can do anything! Treat it like a normal down event.
-
-                    final View toCapture = findTopChildUnder((int) x, (int) y);
-                    tryCaptureViewForDrag(toCapture, pointerId);
-
-                    final int edgesTouched = mInitialEdgesTouched[pointerId];
-                    if ((edgesTouched & mTrackingEdges) != 0) {
-                        mCallback.onEdgeTouched(edgesTouched & mTrackingEdges, pointerId);
-                    }
-                } else if (isCapturedViewUnder((int) x, (int) y)) {
-                    // We're still tracking a captured view. If the same view is under this
-                    // point, we'll swap to controlling it with this pointer instead.
-                    // (This will still work if we're "catching" a settling view.)
-
-                    tryCaptureViewForDrag(mCapturedView, pointerId);
-                }
-                break;
-            }
-
-            case MotionEvent.ACTION_MOVE: {
-                if (mDragState == STATE_DRAGGING) {
-                    int index = MotionEventCompat.findPointerIndex(ev, mActivePointerId);
-                    if (index < 0) {
-                        Log.e(TAG, "Pointer index for id " + mActivePointerId + " not found."
-                                + " Skipping MotionEvent");
-                        return;
-                    }
-                    final float x = MotionEventCompat.getX(ev, index);
-                    final float y = MotionEventCompat.getY(ev, index);
-                    final int idx = (int) (x - mLastMotionX[mActivePointerId]);
-                    final int idy = (int) (y - mLastMotionY[mActivePointerId]);
-
-                    dragTo(mCapturedView.getLeft() + idx, mCapturedView.getTop() + idy, idx, idy);
-
-                    saveLastMotion(ev);
-                } else {
-                    // Check to see if any pointer is now over a draggable view.
-                    final int pointerCount = MotionEventCompat.getPointerCount(ev);
-                    for (int i = 0; i < pointerCount; i++) {
-                        final int pointerId = MotionEventCompat.getPointerId(ev, i);
-                        final float x = MotionEventCompat.getX(ev, i);
-                        final float y = MotionEventCompat.getY(ev, i);
-                        final float dx = x - mInitialMotionX[pointerId];
-                        final float dy = y - mInitialMotionY[pointerId];
-
-                        reportNewEdgeDrags(dx, dy, pointerId);
-                        if (mDragState == STATE_DRAGGING) {
-                            // Callback might have started an edge drag.
-                            break;
-                        }
-
-                        final View toCapture = findTopChildUnder((int) x, (int) y);
-                        if (checkTouchSlop(toCapture, dx, dy) &&
-                                tryCaptureViewForDrag(toCapture, pointerId)) {
-                            break;
-                        }
-                    }
-                    saveLastMotion(ev);
-                }
-                break;
-            }
-
-            case MotionEventCompat.ACTION_POINTER_UP: {
-                final int pointerId = MotionEventCompat.getPointerId(ev, actionIndex);
-                if (mDragState == STATE_DRAGGING && pointerId == mActivePointerId) {
-                    // Try to find another pointer that's still holding on to the captured view.
-                    int newActivePointer = INVALID_POINTER;
-                    final int pointerCount = MotionEventCompat.getPointerCount(ev);
-                    for (int i = 0; i < pointerCount; i++) {
-                        final int id = MotionEventCompat.getPointerId(ev, i);
-                        if (id == mActivePointerId) {
-                            // This one's going away, skip.
-                            continue;
-                        }
-
-                        final float x = MotionEventCompat.getX(ev, i);
-                        final float y = MotionEventCompat.getY(ev, i);
-                        if (findTopChildUnder((int) x, (int) y) == mCapturedView &&
-                                tryCaptureViewForDrag(mCapturedView, id)) {
-                            newActivePointer = mActivePointerId;
-                            break;
-                        }
-                    }
-
-                    if (newActivePointer == INVALID_POINTER) {
-                        // We didn't find another pointer still touching the view, release it.
-                        releaseViewForPointerUp();
-                    }
-                }
-                clearMotionHistory(pointerId);
-                break;
-            }
-
-            case MotionEvent.ACTION_UP: {
-                if (mDragState == STATE_DRAGGING) {
-                    releaseViewForPointerUp();
-                }
-                cancel();
-                break;
-            }
-
-            case MotionEvent.ACTION_CANCEL: {
-                if (mDragState == STATE_DRAGGING) {
-                    dispatchViewReleased(0, 0);
-                }
-                cancel();
-                break;
-            }
-        }
-    }
-
-    private void reportNewEdgeDrags(float dx, float dy, int pointerId) {
-        int dragsStarted = 0;
-        if (checkNewEdgeDrag(dx, dy, pointerId, EDGE_LEFT)) {
-            dragsStarted |= EDGE_LEFT;
-        }
-        if (checkNewEdgeDrag(dy, dx, pointerId, EDGE_TOP)) {
-            dragsStarted |= EDGE_TOP;
-        }
-        if (checkNewEdgeDrag(dx, dy, pointerId, EDGE_RIGHT)) {
-            dragsStarted |= EDGE_RIGHT;
-        }
-        if (checkNewEdgeDrag(dy, dx, pointerId, EDGE_BOTTOM)) {
-            dragsStarted |= EDGE_BOTTOM;
-        }
-
-        if (dragsStarted != 0) {
-            mEdgeDragsInProgress[pointerId] |= dragsStarted;
-            mCallback.onEdgeDragStarted(dragsStarted, pointerId);
-        }
-    }
-
-    private boolean checkNewEdgeDrag(float delta, float odelta, int pointerId, int edge) {
-        final float absDelta = Math.abs(delta);
-        final float absODelta = Math.abs(odelta);
-
-        if ((mInitialEdgesTouched[pointerId] & edge) != edge  || (mTrackingEdges & edge) == 0 ||
-                (mEdgeDragsLocked[pointerId] & edge) == edge ||
-                (mEdgeDragsInProgress[pointerId] & edge) == edge ||
-                (absDelta <= mTouchSlop && absODelta <= mTouchSlop)) {
-            return false;
-        }
-        if (absDelta < absODelta * 0.5f && mCallback.onEdgeLock(edge)) {
-            mEdgeDragsLocked[pointerId] |= edge;
-            return false;
-        }
-        return (mEdgeDragsInProgress[pointerId] & edge) == 0 && absDelta > mTouchSlop;
-    }
-
-    /**
-     * Check if we've crossed a reasonable touch slop for the given child view.
-     * If the child cannot be dragged along the horizontal or vertical axis, motion
-     * along that axis will not count toward the slop check.
-     *
-     * @param child Child to check
-     * @param dx Motion since initial position along X axis
-     * @param dy Motion since initial position along Y axis
-     * @return true if the touch slop has been crossed
-     */
-    private boolean checkTouchSlop(View child, float dx, float dy) {
-        if (child == null) {
-            return false;
-        }
-        final boolean checkHorizontal = mCallback.getViewHorizontalDragRange(child) > 0;
-        final boolean checkVertical = mCallback.getViewVerticalDragRange(child) > 0;
-
-        if (checkHorizontal && checkVertical) {
-            return dx * dx + dy * dy > mTouchSlop * mTouchSlop;
-        } else if (checkHorizontal) {
-            return Math.abs(dx) > mTouchSlop;
-        } else if (checkVertical) {
-            return Math.abs(dy) > mTouchSlop;
-        }
-        return false;
-    }
-
-    /**
-     * Check if any pointer tracked in the current gesture has crossed
-     * the required slop threshold.
-     *
-     * <p>This depends on internal state populated by
-     * {@link #shouldInterceptTouchEvent(android.view.MotionEvent)} or
-     * {@link #processTouchEvent(android.view.MotionEvent)}. You should only rely on
-     * the results of this method after all currently available touch data
-     * has been provided to one of these two methods.</p>
-     *
-     * @param directions Combination of direction flags, see {@link #DIRECTION_HORIZONTAL},
-     *                   {@link #DIRECTION_VERTICAL}, {@link #DIRECTION_ALL}
-     * @return true if the slop threshold has been crossed, false otherwise
-     */
-    public boolean checkTouchSlop(int directions) {
-        final int count = mInitialMotionX.length;
-        for (int i = 0; i < count; i++) {
-            if (checkTouchSlop(directions, i)) {
-                return true;
-            }
-        }
-        return false;
-    }
-
-    /**
-     * Check if the specified pointer tracked in the current gesture has crossed
-     * the required slop threshold.
-     *
-     * <p>This depends on internal state populated by
-     * {@link #shouldInterceptTouchEvent(android.view.MotionEvent)} or
-     * {@link #processTouchEvent(android.view.MotionEvent)}. You should only rely on
-     * the results of this method after all currently available touch data
-     * has been provided to one of these two methods.</p>
-     *
-     * @param directions Combination of direction flags, see {@link #DIRECTION_HORIZONTAL},
-     *                   {@link #DIRECTION_VERTICAL}, {@link #DIRECTION_ALL}
-     * @param pointerId ID of the pointer to slop check as specified by MotionEvent
-     * @return true if the slop threshold has been crossed, false otherwise
-     */
-    public boolean checkTouchSlop(int directions, int pointerId) {
-        if (!isPointerDown(pointerId)) {
-            return false;
-        }
-
-        final boolean checkHorizontal = (directions & DIRECTION_HORIZONTAL) == DIRECTION_HORIZONTAL;
-        final boolean checkVertical = (directions & DIRECTION_VERTICAL) == DIRECTION_VERTICAL;
-
-        final float dx = mLastMotionX[pointerId] - mInitialMotionX[pointerId];
-        final float dy = mLastMotionY[pointerId] - mInitialMotionY[pointerId];
-
-        if (checkHorizontal && checkVertical) {
-            return dx * dx + dy * dy > mTouchSlop * mTouchSlop;
-        } else if (checkHorizontal) {
-            return Math.abs(dx) > mTouchSlop;
-        } else if (checkVertical) {
-            return Math.abs(dy) > mTouchSlop;
-        }
-        return false;
-    }
-
-    /**
-     * Check if any of the edges specified were initially touched in the currently active gesture.
-     * If there is no currently active gesture this method will return false.
-     *
-     * @param edges Edges to check for an initial edge touch. See {@link #EDGE_LEFT},
-     *              {@link #EDGE_TOP}, {@link #EDGE_RIGHT}, {@link #EDGE_BOTTOM} and
-     *              {@link #EDGE_ALL}
-     * @return true if any of the edges specified were initially touched in the current gesture
-     */
-    public boolean isEdgeTouched(int edges) {
-        final int count = mInitialEdgesTouched.length;
-        for (int i = 0; i < count; i++) {
-            if (isEdgeTouched(edges, i)) {
-                return true;
-            }
-        }
-        return false;
-    }
-
-    /**
-     * Check if any of the edges specified were initially touched by the pointer with
-     * the specified ID. If there is no currently active gesture or if there is no pointer with
-     * the given ID currently down this method will return false.
-     *
-     * @param edges Edges to check for an initial edge touch. See {@link #EDGE_LEFT},
-     *              {@link #EDGE_TOP}, {@link #EDGE_RIGHT}, {@link #EDGE_BOTTOM} and
-     *              {@link #EDGE_ALL}
-     * @return true if any of the edges specified were initially touched in the current gesture
-     */
-    public boolean isEdgeTouched(int edges, int pointerId) {
-        return isPointerDown(pointerId) && (mInitialEdgesTouched[pointerId] & edges) != 0;
-    }
-
-    private void releaseViewForPointerUp() {
-        mVelocityTracker.computeCurrentVelocity(1000, mMaxVelocity);
-        final float xvel = clampMag(
-                VelocityTrackerCompat.getXVelocity(mVelocityTracker, mActivePointerId),
-                mMinVelocity, mMaxVelocity);
-        final float yvel = clampMag(
-                VelocityTrackerCompat.getYVelocity(mVelocityTracker, mActivePointerId),
-                mMinVelocity, mMaxVelocity);
-        dispatchViewReleased(xvel, yvel);
-    }
-
-    private void dragTo(int left, int top, int dx, int dy) {
-        int clampedX = left;
-        int clampedY = top;
-        final int oldLeft = mCapturedView.getLeft();
-        final int oldTop = mCapturedView.getTop();
-        if (dx != 0) {
-            clampedX = mCallback.clampViewPositionHorizontal(mCapturedView, left, dx);
-            mCapturedView.offsetLeftAndRight(clampedX - oldLeft);
-        }
-        if (dy != 0) {
-            clampedY = mCallback.clampViewPositionVertical(mCapturedView, top, dy);
-            mCapturedView.offsetTopAndBottom(clampedY - oldTop);
-        }
-
-        if (dx != 0 || dy != 0) {
-            final int clampedDx = clampedX - oldLeft;
-            final int clampedDy = clampedY - oldTop;
-            mCallback.onViewPositionChanged(mCapturedView, clampedX, clampedY,
-                    clampedDx, clampedDy);
-        }
-    }
-
-    /**
-     * Determine if the currently captured view is under the given point in the
-     * parent view's coordinate system. If there is no captured view this method
-     * will return false.
-     *
-     * @param x X position to test in the parent's coordinate system
-     * @param y Y position to test in the parent's coordinate system
-     * @return true if the captured view is under the given point, false otherwise
-     */
-    public boolean isCapturedViewUnder(int x, int y) {
-        return isViewUnder(mCapturedView, x, y);
-    }
-
-    /**
-     * Determine if the supplied view is under the given point in the
-     * parent view's coordinate system.
-     *
-     * @param view Child view of the parent to hit test
-     * @param x X position to test in the parent's coordinate system
-     * @param y Y position to test in the parent's coordinate system
-     * @return true if the supplied view is under the given point, false otherwise
-     */
-    public boolean isViewUnder(View view, int x, int y) {
-        if (view == null) {
-            return false;
-        }
-        return x >= view.getLeft() &&
-                x < view.getRight() &&
-                y >= view.getTop() &&
-                y < view.getBottom();
-    }
-
-    /**
-     * Find the topmost child under the given point within the parent view's coordinate system.
-     * The child order is determined using {@link Callback#getOrderedChildIndex(int)}.
-     *
-     * @param x X position to test in the parent's coordinate system
-     * @param y Y position to test in the parent's coordinate system
-     * @return The topmost child view under (x, y) or null if none found.
-     */
-    public View findTopChildUnder(int x, int y) {
-        final int childCount = mParentView.getChildCount();
-        for (int i = childCount - 1; i >= 0; i--) {
-            final View child = mParentView.getChildAt(mCallback.getOrderedChildIndex(i));
-            if (x >= child.getLeft() && x < child.getRight() &&
-                    y >= child.getTop() && y < child.getBottom()) {
-                return child;
-            }
-        }
-        return null;
-    }
-
-    private int getEdgesTouched(int x, int y) {
-        int result = 0;
-
-        if (x < mParentView.getLeft() + mEdgeSize) result |= EDGE_LEFT;
-        if (y < mParentView.getTop() + mEdgeSize) result |= EDGE_TOP;
-        if (x > mParentView.getRight() - mEdgeSize) result |= EDGE_RIGHT;
-        if (y > mParentView.getBottom() - mEdgeSize) result |= EDGE_BOTTOM;
-
-        return result;
-    }
-
-    /**
-     * Prepares the {@link ViewDragHelper} for the beginning of a nested scroll.
-     *
-     * @param target The child view that is dispatching the nested scroll.
-     */
-    public void startNestedScroll(View target) {
-        if (mVelocityTracker == null) {
-            mVelocityTracker = VelocityTracker.obtain();
-        }
-        setDragState(STATE_DRAGGING);
-        mCapturedView = target;
-    }
-
-    /**
-     * Informs the {@link ViewDragHelper} that a nested scroll has ended.
-     *
-     * @param target The child view that is dispatching the nested scroll.
-     */
-    public void stopNestedScroll(View target) {
-        mCapturedView = target;
-        dispatchViewReleased(0, 0);
-    }
-
-    /**
-     * Update the {@link ViewDragHelper} with a new nested scrolling event.
-     *
-     * @param target The child view that is dispatching the nested scroll.
-     * @param dx The x distance scrolled on the child, in pixels.
-     * @param dy The y distance scroll on the child, in pixels.
-     * @param consumed An int array for the {@link ViewDragHelper} to report back the scroll
-     *         deltas that it consumed.
-     */
-    public void processNestedScroll(View target, int dx, int dy, int[] consumed) {
-        if (mCapturedView == null) {
-            // This is safe because consumed array is null when called from
-            // onNestedScroll, and pre-initialized to {0, 0} when called from
-            // onNestedPreScroll.
-            return;
-        }
-        final int targetX = mCapturedView.getLeft() + dx;
-        final int targetY = mCapturedView.getTop() + dy;
-        dragTo(targetX, targetY, dx, dy);
-        if (consumed != null) {
-            final int unconsumedX = targetX - mCapturedView.getLeft();
-            final int unconsumedY = targetY - mCapturedView.getTop();
-            consumed[0] = unconsumedX - dx;
-            consumed[1] = unconsumedY - dy;
-        }
-    }
-
-}