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

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This commit is contained in:
Adam Powell
2010-01-28 13:52:24 -08:00
parent f1a0f55f71
commit 3fc3737ceb
3 changed files with 54 additions and 8 deletions
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9
core/java/android/widget/HorizontalScrollView.java
View File

@ -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 {

44
core/java/android/widget/OverScroller.java
View File

@ -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);
}

9
core/java/android/widget/ScrollView.java
View File

@ -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 {