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Commit 8d769d66 authored by Adam Cohen's avatar Adam Cohen
Browse files

Revert edge glow effect and restore damped overscroll

Bug 62628421

Change-Id: Iab6ac567e98e63ade34de8817c3ae1f58c25ba19
parent 374d170f
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+78 −59
Original line number Diff line number Diff line
@@ -24,7 +24,6 @@ import android.animation.TimeInterpolator;
import android.annotation.SuppressLint;
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.Matrix;
import android.graphics.Rect;
import android.os.Bundle;
@@ -49,7 +48,6 @@ import android.view.animation.Interpolator;

import com.android.launcher3.anim.PropertyListBuilder;
import com.android.launcher3.pageindicators.PageIndicator;
import com.android.launcher3.util.LauncherEdgeEffect;
import com.android.launcher3.util.Themes;
import com.android.launcher3.util.Thunk;

@@ -70,6 +68,11 @@ public abstract class PagedView extends ViewGroup implements ViewGroup.OnHierarc
    public static final int PAGE_SNAP_ANIMATION_DURATION = 750;
    protected static final int SLOW_PAGE_SNAP_ANIMATION_DURATION = 950;

    // Overscroll constants
    private final static int OVERSCROLL_PAGE_SNAP_ANIMATION_DURATION = 270;
    private static final float OVERSCROLL_ACCELERATE_FACTOR = 2;
    private static final float OVERSCROLL_DAMP_FACTOR = 0.07f;

    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;
@@ -145,6 +148,13 @@ public abstract class PagedView extends ViewGroup implements ViewGroup.OnHierarc

    protected boolean mWasInOverscroll = false;

    // mOverScrollX is equal to getScrollX() when we're within the normal scroll range. Otherwise
    // it is equal to the scaled overscroll position. We use a separate value so as to prevent
    // the screens from continuing to translate beyond the normal bounds.
    protected int mOverScrollX;

    protected int mUnboundedScrollX;

    // Page Indicator
    @Thunk int mPageIndicatorViewId;
    protected PageIndicator mPageIndicator;
@@ -184,10 +194,6 @@ public abstract class PagedView extends ViewGroup implements ViewGroup.OnHierarc
    protected final Rect mInsets = new Rect();
    protected final boolean mIsRtl;

    // Edge effect
    private final LauncherEdgeEffect mEdgeGlowLeft = new LauncherEdgeEffect();
    private final LauncherEdgeEffect mEdgeGlowRight = new LauncherEdgeEffect();

    public PagedView(Context context) {
        this(context, null);
    }
@@ -229,8 +235,6 @@ public abstract class PagedView extends ViewGroup implements ViewGroup.OnHierarc
        setWillNotDraw(false);

        int edgeEffectColor = Themes.getAttrColor(getContext(), android.R.attr.colorEdgeEffect);
        mEdgeGlowLeft.setColor(edgeEffectColor);
        mEdgeGlowRight.setColor(edgeEffectColor);
    }

    protected void setDefaultInterpolator(Interpolator interpolator) {
@@ -476,7 +480,7 @@ public abstract class PagedView extends ViewGroup implements ViewGroup.OnHierarc
    }

    protected int getUnboundedScrollX() {
        return getScrollX();
        return mUnboundedScrollX;
    }

    @Override
@@ -499,6 +503,8 @@ public abstract class PagedView extends ViewGroup implements ViewGroup.OnHierarc
            x = Math.max(x, mFreeScrollMinScrollX);
        }

        mUnboundedScrollX = x;

        boolean isXBeforeFirstPage = mIsRtl ? (x > mMaxScrollX) : (x < 0);
        boolean isXAfterLastPage = mIsRtl ? (x < 0) : (x > mMaxScrollX);
        if (isXBeforeFirstPage) {
@@ -526,6 +532,7 @@ public abstract class PagedView extends ViewGroup implements ViewGroup.OnHierarc
                overScroll(0);
                mWasInOverscroll = false;
            }
            mOverScrollX = x;
            super.scrollTo(x, y);
        }

@@ -565,7 +572,8 @@ public abstract class PagedView extends ViewGroup implements ViewGroup.OnHierarc
        if (mScroller.computeScrollOffset()) {
            // Don't bother scrolling if the page does not need to be moved
            if (getUnboundedScrollX() != mScroller.getCurrX()
                    || getScrollY() != mScroller.getCurrY()) {
                    || getScrollY() != mScroller.getCurrY()
                    || mOverScrollX != mScroller.getCurrX()) {
                float scaleX = mFreeScroll ? getScaleX() : 1f;
                int scrollX = (int) (mScroller.getCurrX() * (1 / scaleX));
                scrollTo(scrollX, mScroller.getCurrY());
@@ -972,47 +980,6 @@ public abstract class PagedView extends ViewGroup implements ViewGroup.OnHierarc
        range[1] = Math.max(0, getChildCount() - 1);
    }

    @Override
    public void draw(Canvas canvas) {
        super.draw(canvas);
        if (getPageCount() > 0) {
            if (!mEdgeGlowLeft.isFinished()) {
                final int restoreCount = canvas.save();
                Rect display = mViewport;
                canvas.translate(display.left, display.top);
                canvas.rotate(270);

                getEdgeVerticalPosition(sTmpIntPoint);
                canvas.translate(display.top - sTmpIntPoint[1], 0);
                mEdgeGlowLeft.setSize(sTmpIntPoint[1] - sTmpIntPoint[0], display.width());
                if (mEdgeGlowLeft.draw(canvas)) {
                    postInvalidateOnAnimation();
                }
                canvas.restoreToCount(restoreCount);
            }
            if (!mEdgeGlowRight.isFinished()) {
                final int restoreCount = canvas.save();
                Rect display = mViewport;
                canvas.translate(display.left + mPageScrolls[mIsRtl ? 0 : (getPageCount() - 1)], display.top);
                canvas.rotate(90);

                getEdgeVerticalPosition(sTmpIntPoint);

                canvas.translate(sTmpIntPoint[0] - display.top, -display.width());
                mEdgeGlowRight.setSize(sTmpIntPoint[1] - sTmpIntPoint[0], display.width());
                if (mEdgeGlowRight.draw(canvas)) {
                    postInvalidateOnAnimation();
                }
                canvas.restoreToCount(restoreCount);
            }
        }
    }

    /**
     * Returns the top and bottom position for the edge effect.
     */
    protected abstract void getEdgeVerticalPosition(int[] pos);

    @Override
    public boolean requestChildRectangleOnScreen(View child, Rect rectangle, boolean immediate) {
        int page = indexToPage(indexOfChild(child));
@@ -1335,6 +1302,29 @@ public abstract class PagedView extends ViewGroup implements ViewGroup.OnHierarc
        }
    }

    // This curve determines how the effect of scrolling over the limits of the page dimishes
    // as the user pulls further and further from the bounds
    private float overScrollInfluenceCurve(float f) {
        f -= 1.0f;
        return f * f * f + 1.0f;
    }

    protected float acceleratedOverFactor(float amount) {
        int screenSize = getViewportWidth();

        // We want to reach the max over scroll effect when the user has
        // over scrolled half the size of the screen
        float f = OVERSCROLL_ACCELERATE_FACTOR * (amount / screenSize);

        if (Float.compare(f, 0f) == 0) return 0;

        // Clamp this factor, f, to -1 < f < 1
        if (Math.abs(f) >= 1) {
            f /= Math.abs(f);
        }
        return f;
    }

    // While layout transitions are occurring, a child's position may stray from its baseline
    // position. This method returns the magnitude of this stray at any given time.
    public int getLayoutTransitionOffsetForPage(int index) {
@@ -1356,13 +1346,25 @@ public abstract class PagedView extends ViewGroup implements ViewGroup.OnHierarc

    protected void dampedOverScroll(float amount) {
        int screenSize = getViewportWidth();

        float f = (amount / screenSize);
        if (f < 0) {
            mEdgeGlowLeft.onPull(-f);
        } else if (f > 0) {
            mEdgeGlowRight.onPull(f);

        if (Float.compare(f, 0f) == 0) return;

        f = f / (Math.abs(f)) * (overScrollInfluenceCurve(Math.abs(f)));

        // Clamp this factor, f, to -1 < f < 1
        if (Math.abs(f) >= 1) {
            f /= Math.abs(f);
        }

        int overScrollAmount = (int) Math.round(OVERSCROLL_DAMP_FACTOR * f * screenSize);
        if (amount < 0) {
            mOverScrollX = overScrollAmount;
            super.scrollTo(mOverScrollX, getScrollY());
        } else {
            return;
            mOverScrollX = mMaxScrollX + overScrollAmount;
            super.scrollTo(mOverScrollX, getScrollY());
        }
        invalidate();
    }
@@ -1371,6 +1373,14 @@ public abstract class PagedView extends ViewGroup implements ViewGroup.OnHierarc
        dampedOverScroll(amount);
    }

    protected float maxOverScroll() {
        // Using the formula in overScroll, assuming that f = 1.0 (which it should generally not
        // exceed). Used to find out how much extra wallpaper we need for the over scroll effect
        float f = 1.0f;
        f = f / (Math.abs(f)) * (overScrollInfluenceCurve(Math.abs(f)));
        return OVERSCROLL_DAMP_FACTOR * f;
    }

    /**
     * return true if freescroll has been enabled, false otherwise
     */
@@ -1715,8 +1725,6 @@ public abstract class PagedView extends ViewGroup implements ViewGroup.OnHierarc
        mCancelTap = false;
        mTouchState = TOUCH_STATE_REST;
        mActivePointerId = INVALID_POINTER;
        mEdgeGlowLeft.onRelease();
        mEdgeGlowRight.onRelease();
    }

    /**
@@ -1830,7 +1838,18 @@ public abstract class PagedView extends ViewGroup implements ViewGroup.OnHierarc
    }

    protected void snapToDestination() {
        snapToPage(getPageNearestToCenterOfScreen(), PAGE_SNAP_ANIMATION_DURATION);
        snapToPage(getPageNearestToCenterOfScreen(), getPageSnapDuration());
    }

    protected boolean isInOverScroll() {
        return (mOverScrollX > mMaxScrollX || mOverScrollX < 0);
    }

    protected int getPageSnapDuration() {
        if (isInOverScroll()) {
            return OVERSCROLL_PAGE_SNAP_ANIMATION_DURATION;
        }
        return PAGE_SNAP_ANIMATION_DURATION;
    }

    public static class ScrollInterpolator implements Interpolator {
+2 −24
Original line number Diff line number Diff line
@@ -301,8 +301,7 @@ public class Workspace extends PagedView
    boolean mScrollInteractionBegan;
    boolean mStartedSendingScrollEvents;
    float mLastOverlayScroll = 0;
    // Total over scrollX in the overlay direction.
    private int mUnboundedScrollX;

    private boolean mForceDrawAdjacentPages = false;
    // Total over scrollX in the overlay direction.
    private float mOverlayTranslation;
@@ -1322,18 +1321,10 @@ public class Workspace extends PagedView
        onOverlayScrollChanged(0);
    }

    @Override
    protected int getUnboundedScrollX() {
        if (isScrollingOverlay()) {
            return mUnboundedScrollX;
        }

        return super.getUnboundedScrollX();
    }

    private boolean isScrollingOverlay() {
        return mLauncherOverlay != null &&
                ((mIsRtl && mUnboundedScrollX > mMaxScrollX) || (!mIsRtl && mUnboundedScrollX < 0));
                ((mIsRtl && getUnboundedScrollX() > mMaxScrollX) || (!mIsRtl && getUnboundedScrollX() < 0));
    }

    @Override
@@ -1352,12 +1343,6 @@ public class Workspace extends PagedView
        }
    }

    @Override
    public void scrollTo(int x, int y) {
        mUnboundedScrollX = x;
        super.scrollTo(x, y);
    }

    @Override
    protected void onScrollChanged(int l, int t, int oldl, int oldt) {
        super.onScrollChanged(l, t, oldl, oldt);
@@ -1530,13 +1515,6 @@ public class Workspace extends PagedView
        }
    }

    @Override
    protected void getEdgeVerticalPosition(int[] pos) {
        View child = getChildAt(getPageCount() - 1);
        pos[0] = child.getTop();
        pos[1] = child.getBottom();
    }

    @Override
    protected void notifyPageSwitchListener() {
        super.notifyPageSwitchListener();
+0 −6
Original line number Diff line number Diff line
@@ -701,10 +701,4 @@ public class FolderPagedView extends PagedView {
    public int itemsPerPage() {
        return mMaxItemsPerPage;
    }

    @Override
    protected void getEdgeVerticalPosition(int[] pos) {
        pos[0] = 0;
        pos[1] = getViewportHeight();
    }
}
+0 −365
Original line number Diff line number Diff line
/*
 * Copyright (C) 2015 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.android.launcher3.util;

import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.Rect;
import android.view.animation.AnimationUtils;
import android.view.animation.DecelerateInterpolator;
import android.view.animation.Interpolator;

/**
 * This class differs from the framework {@link android.widget.EdgeEffect}:
 *   1) It does not use PorterDuffXfermode
 *   2) The width to radius factor is smaller (0.5 instead of 0.75)
 */
public class LauncherEdgeEffect {

    // Time it will take the effect to fully recede in ms
    private static final int RECEDE_TIME = 600;

    // Time it will take before a pulled glow begins receding in ms
    private static final int PULL_TIME = 167;

    // Time it will take in ms for a pulled glow to decay to partial strength before release
    private static final int PULL_DECAY_TIME = 2000;

    private static final float MAX_ALPHA = 0.5f;

    private static final float MAX_GLOW_SCALE = 2.f;

    private static final float PULL_GLOW_BEGIN = 0.f;

    // Minimum velocity that will be absorbed
    private static final int MIN_VELOCITY = 100;
    // Maximum velocity, clamps at this value
    private static final int MAX_VELOCITY = 10000;

    private static final float EPSILON = 0.001f;

    private static final double ANGLE = Math.PI / 6;
    private static final float SIN = (float) Math.sin(ANGLE);
    private static final float COS = (float) Math.cos(ANGLE);

    private float mGlowAlpha;
    private float mGlowScaleY;

    private float mGlowAlphaStart;
    private float mGlowAlphaFinish;
    private float mGlowScaleYStart;
    private float mGlowScaleYFinish;

    private long mStartTime;
    private float mDuration;

    private final Interpolator mInterpolator;

    private static final int STATE_IDLE = 0;
    private static final int STATE_PULL = 1;
    private static final int STATE_ABSORB = 2;
    private static final int STATE_RECEDE = 3;
    private static final int STATE_PULL_DECAY = 4;

    private static final float PULL_DISTANCE_ALPHA_GLOW_FACTOR = 0.8f;

    private static final int VELOCITY_GLOW_FACTOR = 6;

    private int mState = STATE_IDLE;

    private float mPullDistance;

    private final Rect mBounds = new Rect();
    private final Paint mPaint = new Paint();
    private float mRadius;
    private float mBaseGlowScale;
    private float mDisplacement = 0.5f;
    private float mTargetDisplacement = 0.5f;

    /**
     * Construct a new EdgeEffect with a theme appropriate for the provided context.
     */
    public LauncherEdgeEffect() {
        mPaint.setAntiAlias(true);
        mPaint.setStyle(Paint.Style.FILL);
        mInterpolator = new DecelerateInterpolator();
    }

    /**
     * Set the size of this edge effect in pixels.
     *
     * @param width Effect width in pixels
     * @param height Effect height in pixels
     */
    public void setSize(int width, int height) {
        final float r = width * 0.5f / SIN;
        final float y = COS * r;
        final float h = r - y;
        final float or = height * 0.75f / SIN;
        final float oy = COS * or;
        final float oh = or - oy;

        mRadius = r;
        mBaseGlowScale = h > 0 ? Math.min(oh / h, 1.f) : 1.f;

        mBounds.set(mBounds.left, mBounds.top, width, (int) Math.min(height, h));
    }

    /**
     * Reports if this EdgeEffect's animation is finished. If this method returns false
     * after a call to {@link #draw(Canvas)} the host widget should schedule another
     * drawing pass to continue the animation.
     *
     * @return true if animation is finished, false if drawing should continue on the next frame.
     */
    public boolean isFinished() {
        return mState == STATE_IDLE;
    }

    /**
     * Immediately finish the current animation.
     * After this call {@link #isFinished()} will return true.
     */
    public void finish() {
        mState = STATE_IDLE;
    }

    /**
     * A view should call this when content is pulled away from an edge by the user.
     * This will update the state of the current visual effect and its associated animation.
     * The host view should always {@link android.view.View#invalidate()} after this
     * and draw the results accordingly.
     *
     * <p>Views using EdgeEffect should favor {@link #onPull(float, float)} when the displacement
     * of the pull point is known.</p>
     *
     * @param deltaDistance Change in distance since the last call. Values may be 0 (no change) to
     *                      1.f (full length of the view) or negative values to express change
     *                      back toward the edge reached to initiate the effect.
     */
    public void onPull(float deltaDistance) {
        onPull(deltaDistance, 0.5f);
    }

    /**
     * A view should call this when content is pulled away from an edge by the user.
     * This will update the state of the current visual effect and its associated animation.
     * The host view should always {@link android.view.View#invalidate()} after this
     * and draw the results accordingly.
     *
     * @param deltaDistance Change in distance since the last call. Values may be 0 (no change) to
     *                      1.f (full length of the view) or negative values to express change
     *                      back toward the edge reached to initiate the effect.
     * @param displacement The displacement from the starting side of the effect of the point
     *                     initiating the pull. In the case of touch this is the finger position.
     *                     Values may be from 0-1.
     */
    public void onPull(float deltaDistance, float displacement) {
        final long now = AnimationUtils.currentAnimationTimeMillis();
        mTargetDisplacement = displacement;
        if (mState == STATE_PULL_DECAY && now - mStartTime < mDuration) {
            return;
        }
        if (mState != STATE_PULL) {
            mGlowScaleY = Math.max(PULL_GLOW_BEGIN, mGlowScaleY);
        }
        mState = STATE_PULL;

        mStartTime = now;
        mDuration = PULL_TIME;

        mPullDistance += deltaDistance;

        final float absdd = Math.abs(deltaDistance);
        mGlowAlpha = mGlowAlphaStart = Math.min(MAX_ALPHA,
                mGlowAlpha + (absdd * PULL_DISTANCE_ALPHA_GLOW_FACTOR));

        if (mPullDistance == 0) {
            mGlowScaleY = mGlowScaleYStart = 0;
        } else {
            final float scale = (float) (Math.max(0, 1 - 1 /
                    Math.sqrt(Math.abs(mPullDistance) * mBounds.height()) - 0.3d) / 0.7d);

            mGlowScaleY = mGlowScaleYStart = scale;
        }

        mGlowAlphaFinish = mGlowAlpha;
        mGlowScaleYFinish = mGlowScaleY;
    }

    /**
     * Call when the object is released after being pulled.
     * This will begin the "decay" phase of the effect. After calling this method
     * the host view should {@link android.view.View#invalidate()} and thereby
     * draw the results accordingly.
     */
    public void onRelease() {
        mPullDistance = 0;

        if (mState != STATE_PULL && mState != STATE_PULL_DECAY) {
            return;
        }

        mState = STATE_RECEDE;
        mGlowAlphaStart = mGlowAlpha;
        mGlowScaleYStart = mGlowScaleY;

        mGlowAlphaFinish = 0.f;
        mGlowScaleYFinish = 0.f;

        mStartTime = AnimationUtils.currentAnimationTimeMillis();
        mDuration = RECEDE_TIME;
    }

    /**
     * Call when the effect absorbs an impact at the given velocity.
     * Used when a fling reaches the scroll boundary.
     *
     * <p>When using a {@link android.widget.Scroller} or {@link android.widget.OverScroller},
     * the method <code>getCurrVelocity</code> will provide a reasonable approximation
     * to use here.</p>
     *
     * @param velocity Velocity at impact in pixels per second.
     */
    public void onAbsorb(int velocity) {
        mState = STATE_ABSORB;
        velocity = Math.min(Math.max(MIN_VELOCITY, Math.abs(velocity)), MAX_VELOCITY);

        mStartTime = AnimationUtils.currentAnimationTimeMillis();
        mDuration = 0.15f + (velocity * 0.02f);

        // The glow depends more on the velocity, and therefore starts out
        // nearly invisible.
        mGlowAlphaStart = 0.3f;
        mGlowScaleYStart = Math.max(mGlowScaleY, 0.f);


        // Growth for the size of the glow should be quadratic to properly
        // respond
        // to a user's scrolling speed. The faster the scrolling speed, the more
        // intense the effect should be for both the size and the saturation.
        mGlowScaleYFinish = Math.min(0.025f + (velocity * (velocity / 100) * 0.00015f) / 2, 1.f);
        // Alpha should change for the glow as well as size.
        mGlowAlphaFinish = Math.max(
                mGlowAlphaStart, Math.min(velocity * VELOCITY_GLOW_FACTOR * .00001f, MAX_ALPHA));
        mTargetDisplacement = 0.5f;
    }

    /**
     * Set the color of this edge effect in argb.
     *
     * @param color Color in argb
     */
    public void setColor(int color) {
        mPaint.setColor(color);
    }

    /**
     * Return the color of this edge effect in argb.
     * @return The color of this edge effect in argb
     */
    public int getColor() {
        return mPaint.getColor();
    }

    /**
     * Draw into the provided canvas. Assumes that the canvas has been rotated
     * accordingly and the size has been set. The effect will be drawn the full
     * width of X=0 to X=width, beginning from Y=0 and extending to some factor <
     * 1.f of height.
     *
     * @param canvas Canvas to draw into
     * @return true if drawing should continue beyond this frame to continue the
     *         animation
     */
    public boolean draw(Canvas canvas) {
        update();

        final float centerX = mBounds.centerX();
        final float centerY = mBounds.height() - mRadius;

        canvas.scale(1.f, Math.min(mGlowScaleY, 1.f) * mBaseGlowScale, centerX, 0);

        final float displacement = Math.max(0, Math.min(mDisplacement, 1.f)) - 0.5f;
        float translateX = mBounds.width() * displacement / 2;
        mPaint.setAlpha((int) (0xff * mGlowAlpha));
        canvas.drawCircle(centerX + translateX, centerY, mRadius, mPaint);

        boolean oneLastFrame = false;
        if (mState == STATE_RECEDE && mGlowScaleY == 0) {
            mState = STATE_IDLE;
            oneLastFrame = true;
        }

        return mState != STATE_IDLE || oneLastFrame;
    }

    /**
     * Return the maximum height that the edge effect will be drawn at given the original
     * {@link #setSize(int, int) input size}.
     * @return The maximum height of the edge effect
     */
    public int getMaxHeight() {
        return (int) (mBounds.height() * MAX_GLOW_SCALE + 0.5f);
    }

    private void update() {
        final long time = AnimationUtils.currentAnimationTimeMillis();
        final float t = Math.min((time - mStartTime) / mDuration, 1.f);

        final float interp = mInterpolator.getInterpolation(t);

        mGlowAlpha = mGlowAlphaStart + (mGlowAlphaFinish - mGlowAlphaStart) * interp;
        mGlowScaleY = mGlowScaleYStart + (mGlowScaleYFinish - mGlowScaleYStart) * interp;
        mDisplacement = (mDisplacement + mTargetDisplacement) / 2;

        if (t >= 1.f - EPSILON) {
            switch (mState) {
                case STATE_ABSORB:
                    mState = STATE_RECEDE;
                    mStartTime = AnimationUtils.currentAnimationTimeMillis();
                    mDuration = RECEDE_TIME;

                    mGlowAlphaStart = mGlowAlpha;
                    mGlowScaleYStart = mGlowScaleY;

                    // After absorb, the glow should fade to nothing.
                    mGlowAlphaFinish = 0.f;
                    mGlowScaleYFinish = 0.f;
                    break;
                case STATE_PULL:
                    mState = STATE_PULL_DECAY;
                    mStartTime = AnimationUtils.currentAnimationTimeMillis();
                    mDuration = PULL_DECAY_TIME;

                    mGlowAlphaStart = mGlowAlpha;
                    mGlowScaleYStart = mGlowScaleY;

                    // After pull, the glow should fade to nothing.
                    mGlowAlphaFinish = 0.f;
                    mGlowScaleYFinish = 0.f;
                    break;
                case STATE_PULL_DECAY:
                    mState = STATE_RECEDE;
                    break;
                case STATE_RECEDE:
                    mState = STATE_IDLE;
                    break;
            }
        }
    }
}