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Commit 3fc3737c authored by Adam Powell's avatar Adam Powell
Browse files

ScrollView and HorizontalScrollView now will spring back if smoothScrollBy... 

ScrollView and HorizontalScrollView now will spring back if smoothScrollBy scrolls out of bounds. Tweaked bounce physics for OverScroller.
parent f1a0f55f

core/java/android/widget/HorizontalScrollView.java

+8 −1
Original line number Diff line number Diff line
@@ -815,9 +815,16 @@ public class HorizontalScrollView extends FrameLayout { 
     * @param dy the number of pixels to scroll by on the Y axis

     */

    public final void smoothScrollBy(int dx, int dy) {

        if (getChildCount() == 0) {

            // Nothing to do.

            return;

        }

        long duration = AnimationUtils.currentAnimationTimeMillis() - mLastScroll;

        if (duration > ANIMATED_SCROLL_GAP) {

            mScroller.startScroll(mScrollX, mScrollY, dx, dy);

            int width = getWidth() - mPaddingRight - mPaddingLeft;

            int right = getChildAt(0).getWidth();

            mScroller.startScroll(mScrollX, mScrollY, dx, dy,

                    0, Math.max(0, right - width), 0, 0);

            awakenScrollBars(mScroller.getDuration());

            invalidate();

        } else {

core/java/android/widget/OverScroller.java

+38 −6
Original line number Diff line number Diff line
@@ -49,7 +49,7 @@ public class OverScroller { 
    

    public OverScroller(Context context) {

        mDefaultScroller = new Scroller(context);

        mDecelScroller = new Scroller(context, new DecelerateInterpolator(3.f));

        mDecelScroller = new Scroller(context, new DecelerateInterpolator());

        mAccelDecelScroller = new Scroller(context, new AccelerateDecelerateInterpolator());

        mCurrScroller = mDefaultScroller;

    }
@@ -216,7 +216,7 @@ public class OverScroller { 
    /**

     * Start scrolling by providing a starting point and the distance to travel.

     * The scroll will use the default value of 250 milliseconds for the

     * duration.

     * duration. This version does not spring back to boundaries.

     * 

     * @param startX Starting horizontal scroll offset in pixels. Positive

     *        numbers will scroll the content to the left.
@@ -228,13 +228,45 @@ public class OverScroller { 
     *        content up.

     */

    public void startScroll(int startX, int startY, int dx, int dy) {

        final int minX = Math.min(startX, startX + dx);

        final int maxX = Math.max(startX, startX + dx);

        final int minY = Math.min(startY, startY + dy);

        final int maxY = Math.max(startY, startY + dy);

        startScroll(startX, startY, dx, dy, minX, maxX, minY, maxY);

    }

    

    /**

     * Start scrolling by providing a starting point and the distance to travel.

     * The scroll will use the default value of 250 milliseconds for the

     * duration. This version will spring back to the provided boundaries if

     * the scroll value would take it too far.

     * 

     * @param startX Starting horizontal scroll offset in pixels. Positive

     *        numbers will scroll the content to the left.

     * @param startY Starting vertical scroll offset in pixels. Positive numbers

     *        will scroll the content up.

     * @param dx Horizontal distance to travel. Positive numbers will scroll the

     *        content to the left.

     * @param dy Vertical distance to travel. Positive numbers will scroll the

     *        content up.

     * @param minX Minimum X value. The scroller will not scroll past this

     *        point.

     * @param maxX Maximum X value. The scroller will not scroll past this

     *        point.

     * @param minY Minimum Y value. The scroller will not scroll past this

     *        point.

     * @param maxY Maximum Y value. The scroller will not scroll past this

     *        point.

     */

    public void startScroll(int startX, int startY, int dx, int dy,

            int minX, int maxX, int minY, int maxY) {

        mCurrScroller.abortAnimation();

        mCurrScroller = mDefaultScroller;

        mScrollMode = MODE_DEFAULT;

        mMinimumX = Math.min(startX, startX + dx);

        mMinimumY = Math.min(startY, startY + dy);

        mMaximumX = Math.max(startX, startX + dx);

        mMaximumY = Math.max(startY, startY + dy);

        mMinimumX = minX;

        mMaximumX = maxX; 

        mMinimumY = minY;

        mMaximumY = maxY;

        mCurrScroller.startScroll(startX, startY, dx, dy);

    }

core/java/android/widget/ScrollView.java

+8 −1
Original line number Diff line number Diff line
@@ -817,9 +817,16 @@ public class ScrollView extends FrameLayout { 
     * @param dy the number of pixels to scroll by on the Y axis

     */

    public final void smoothScrollBy(int dx, int dy) {

        if (getChildCount() == 0) {

            // Nothing to do.

            return;

        }

        long duration = AnimationUtils.currentAnimationTimeMillis() - mLastScroll;

        if (duration > ANIMATED_SCROLL_GAP) {

            mScroller.startScroll(mScrollX, mScrollY, dx, dy);

            int height = getHeight() - mPaddingBottom - mPaddingTop;

            int bottom = getChildAt(0).getHeight();

            mScroller.startScroll(mScrollX, mScrollY, dx, dy,

                    0, 0, 0, Math.max(0, bottom - height));

            awakenScrollBars(mScroller.getDuration());

            invalidate();

        } else {