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Invalidate for scrolling animations on the animation timer

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Change View methods awakenScrollBars and scrollTo to post their
invalidation on the animation timer. Since these are often used in
computeScroll or similar to continue scrolling or flinging it should
not prevent other posted events from being processed before the frame
is actually drawn. (All changes in scroll position, etc. are
immediately reflected after the calls and do not need a draw to
present correct data about scroll position to apps.)

Don't accumulate floating point error while dragging
ScrollView/HorizontalScrollView.

Change-Id: I05b57d75f89a806488e46a8fb79b85d80f56d45d
This commit is contained in:
Adam Powell
2012-04-10 18:55:22 -07:00
parent 54ae14749b
commit df3ae4f3ae
3 changed files with 38 additions and 38 deletions
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4
core/java/android/view/View.java
View File

@@ -8698,7 +8698,7 @@ public class View implements Drawable.Callback, Drawable.Callback2, KeyEvent.Cal
invalidateParentCaches();
onScrollChanged(mScrollX, mScrollY, oldX, oldY);
if (!awakenScrollBars()) {
invalidate(true);
postInvalidateOnAnimation();
}
}
}
@@ -8852,7 +8852,7 @@ public class View implements Drawable.Callback, Drawable.Callback2, KeyEvent.Cal
if (invalidate) {
// Invalidate to show the scrollbars
invalidate(true);
postInvalidateOnAnimation();
}
if (scrollCache.state == ScrollabilityCache.OFF) {

34
core/java/android/widget/HorizontalScrollView.java
View File

@@ -77,7 +77,7 @@ public class HorizontalScrollView extends FrameLayout {
/**
* Position of the last motion event.
*/
private float mLastMotionX;
private int mLastMotionX;
/**
* True when the layout has changed but the traversal has not come through yet.
@@ -460,7 +460,7 @@ public class HorizontalScrollView extends FrameLayout {
}
final int pointerIndex = ev.findPointerIndex(activePointerId);
final float x = ev.getX(pointerIndex);
final int x = (int) ev.getX(pointerIndex);
final int xDiff = (int) Math.abs(x - mLastMotionX);
if (xDiff > mTouchSlop) {
mIsBeingDragged = true;
@@ -473,7 +473,7 @@ public class HorizontalScrollView extends FrameLayout {
}
case MotionEvent.ACTION_DOWN: {
final float x = ev.getX();
final int x = (int) ev.getX();
if (!inChild((int) x, (int) ev.getY())) {
mIsBeingDragged = false;
recycleVelocityTracker();
@@ -505,18 +505,18 @@ public class HorizontalScrollView extends FrameLayout {
mIsBeingDragged = false;
mActivePointerId = INVALID_POINTER;
if (mScroller.springBack(mScrollX, mScrollY, 0, getScrollRange(), 0, 0)) {
invalidate();
postInvalidateOnAnimation();
}
break;
case MotionEvent.ACTION_POINTER_DOWN: {
final int index = ev.getActionIndex();
mLastMotionX = ev.getX(index);
mLastMotionX = (int) ev.getX(index);
mActivePointerId = ev.getPointerId(index);
break;
}
case MotionEvent.ACTION_POINTER_UP:
onSecondaryPointerUp(ev);
mLastMotionX = ev.getX(ev.findPointerIndex(mActivePointerId));
mLastMotionX = (int) ev.getX(ev.findPointerIndex(mActivePointerId));
break;
}
@@ -550,7 +550,7 @@ public class HorizontalScrollView extends FrameLayout {
}
// Remember where the motion event started
mLastMotionX = ev.getX();
mLastMotionX = (int) ev.getX();
mActivePointerId = ev.getPointerId(0);
break;
}
@@ -558,7 +558,7 @@ public class HorizontalScrollView extends FrameLayout {
if (mIsBeingDragged) {
// Scroll to follow the motion event
final int activePointerIndex = ev.findPointerIndex(mActivePointerId);
final float x = ev.getX(activePointerIndex);
final int x = (int) ev.getX(activePointerIndex);
final int deltaX = (int) (mLastMotionX - x);
mLastMotionX = x;
@@ -591,7 +591,7 @@ public class HorizontalScrollView extends FrameLayout {
}
if (mEdgeGlowLeft != null
&& (!mEdgeGlowLeft.isFinished() || !mEdgeGlowRight.isFinished())) {
invalidate();
postInvalidateOnAnimation();
}
}
}
@@ -608,7 +608,7 @@ public class HorizontalScrollView extends FrameLayout {
} else {
if (mScroller.springBack(mScrollX, mScrollY, 0,
getScrollRange(), 0, 0)) {
invalidate();
postInvalidateOnAnimation();
}
}
}
@@ -626,7 +626,7 @@ public class HorizontalScrollView extends FrameLayout {
case MotionEvent.ACTION_CANCEL:
if (mIsBeingDragged && getChildCount() > 0) {
if (mScroller.springBack(mScrollX, mScrollY, 0, getScrollRange(), 0, 0)) {
invalidate();
postInvalidateOnAnimation();
}
mActivePointerId = INVALID_POINTER;
mIsBeingDragged = false;
@@ -654,7 +654,7 @@ public class HorizontalScrollView extends FrameLayout {
// active pointer and adjust accordingly.
// TODO: Make this decision more intelligent.
final int newPointerIndex = pointerIndex == 0 ? 1 : 0;
mLastMotionX = ev.getX(newPointerIndex);
mLastMotionX = (int) ev.getX(newPointerIndex);
mActivePointerId = ev.getPointerId(newPointerIndex);
if (mVelocityTracker != null) {
mVelocityTracker.clear();
@@ -1084,7 +1084,7 @@ public class HorizontalScrollView extends FrameLayout {
dx = Math.max(0, Math.min(scrollX + dx, maxX)) - scrollX;
mScroller.startScroll(scrollX, mScrollY, dx, 0);
invalidate();
postInvalidateOnAnimation();
} else {
if (!mScroller.isFinished()) {
mScroller.abortAnimation();
@@ -1206,7 +1206,7 @@ public class HorizontalScrollView extends FrameLayout {
}
if (!awakenScrollBars()) {
invalidate();
postInvalidateOnAnimation();
}
}
}
@@ -1452,7 +1452,7 @@ public class HorizontalScrollView extends FrameLayout {
newFocused.requestFocus(movingRight ? View.FOCUS_RIGHT : View.FOCUS_LEFT);
}
invalidate();
postInvalidateOnAnimation();
}
}
@@ -1503,7 +1503,7 @@ public class HorizontalScrollView extends FrameLayout {
canvas.translate(-height + mPaddingTop, Math.min(0, scrollX));
mEdgeGlowLeft.setSize(height, getWidth());
if (mEdgeGlowLeft.draw(canvas)) {
invalidate();
postInvalidateOnAnimation();
}
canvas.restoreToCount(restoreCount);
}
@@ -1517,7 +1517,7 @@ public class HorizontalScrollView extends FrameLayout {
-(Math.max(getScrollRange(), scrollX) + width));
mEdgeGlowRight.setSize(height, width);
if (mEdgeGlowRight.draw(canvas)) {
invalidate();
postInvalidateOnAnimation();
}
canvas.restoreToCount(restoreCount);
}

38
core/java/android/widget/ScrollView.java
View File

@@ -73,7 +73,7 @@ public class ScrollView extends FrameLayout {
/**
* Position of the last motion event.
*/
private float mLastMotionY;
private int mLastMotionY;
/**
* True when the layout has changed but the traversal has not come through yet.
@@ -472,8 +472,8 @@ public class ScrollView extends FrameLayout {
}
final int pointerIndex = ev.findPointerIndex(activePointerId);
final float y = ev.getY(pointerIndex);
final int yDiff = (int) Math.abs(y - mLastMotionY);
final int y = (int) ev.getY(pointerIndex);
final int yDiff = Math.abs(y - mLastMotionY);
if (yDiff > mTouchSlop) {
mIsBeingDragged = true;
mLastMotionY = y;
@@ -487,7 +487,7 @@ public class ScrollView extends FrameLayout {
}
case MotionEvent.ACTION_DOWN: {
final float y = ev.getY();
final int y = (int) ev.getY();
if (!inChild((int) ev.getX(), (int) y)) {
mIsBeingDragged = false;
recycleVelocityTracker();
@@ -522,7 +522,7 @@ public class ScrollView extends FrameLayout {
mActivePointerId = INVALID_POINTER;
recycleVelocityTracker();
if (mScroller.springBack(mScrollX, mScrollY, 0, 0, 0, getScrollRange())) {
invalidate();
postInvalidateOnAnimation();
}
break;
case MotionEvent.ACTION_POINTER_UP:
@@ -564,7 +564,7 @@ public class ScrollView extends FrameLayout {
}
// Remember where the motion event started
mLastMotionY = ev.getY();
mLastMotionY = (int) ev.getY();
mActivePointerId = ev.getPointerId(0);
break;
}
@@ -572,8 +572,8 @@ public class ScrollView extends FrameLayout {
if (mIsBeingDragged) {
// Scroll to follow the motion event
final int activePointerIndex = ev.findPointerIndex(mActivePointerId);
final float y = ev.getY(activePointerIndex);
final int deltaY = (int) (mLastMotionY - y);
final int y = (int) ev.getY(activePointerIndex);
final int deltaY = mLastMotionY - y;
mLastMotionY = y;
final int oldX = mScrollX;
@@ -605,7 +605,7 @@ public class ScrollView extends FrameLayout {
}
if (mEdgeGlowTop != null
&& (!mEdgeGlowTop.isFinished() || !mEdgeGlowBottom.isFinished())) {
invalidate();
postInvalidateOnAnimation();
}
}
}
@@ -622,7 +622,7 @@ public class ScrollView extends FrameLayout {
} else {
if (mScroller.springBack(mScrollX, mScrollY, 0, 0, 0,
getScrollRange())) {
invalidate();
postInvalidateOnAnimation();
}
}
}
@@ -634,7 +634,7 @@ public class ScrollView extends FrameLayout {
case MotionEvent.ACTION_CANCEL:
if (mIsBeingDragged && getChildCount() > 0) {
if (mScroller.springBack(mScrollX, mScrollY, 0, 0, 0, getScrollRange())) {
invalidate();
postInvalidateOnAnimation();
}
mActivePointerId = INVALID_POINTER;
endDrag();
@@ -642,13 +642,13 @@ public class ScrollView extends FrameLayout {
break;
case MotionEvent.ACTION_POINTER_DOWN: {
final int index = ev.getActionIndex();
mLastMotionY = ev.getY(index);
mLastMotionY = (int) ev.getY(index);
mActivePointerId = ev.getPointerId(index);
break;
}
case MotionEvent.ACTION_POINTER_UP:
onSecondaryPointerUp(ev);
mLastMotionY = ev.getY(ev.findPointerIndex(mActivePointerId));
mLastMotionY = (int) ev.getY(ev.findPointerIndex(mActivePointerId));
break;
}
return true;
@@ -663,7 +663,7 @@ public class ScrollView extends FrameLayout {
// active pointer and adjust accordingly.
// TODO: Make this decision more intelligent.
final int newPointerIndex = pointerIndex == 0 ? 1 : 0;
mLastMotionY = ev.getY(newPointerIndex);
mLastMotionY = (int) ev.getY(newPointerIndex);
mActivePointerId = ev.getPointerId(newPointerIndex);
if (mVelocityTracker != null) {
mVelocityTracker.clear();
@@ -1047,7 +1047,7 @@ public class ScrollView extends FrameLayout {
dy = Math.max(0, Math.min(scrollY + dy, maxY)) - scrollY;
mScroller.startScroll(mScrollX, scrollY, 0, dy);
invalidate();
postInvalidateOnAnimation();
} else {
if (!mScroller.isFinished()) {
mScroller.abortAnimation();
@@ -1174,7 +1174,7 @@ public class ScrollView extends FrameLayout {
if (!awakenScrollBars()) {
// Keep on drawing until the animation has finished.
invalidate();
postInvalidateOnAnimation();
}
} else {
if (mFlingStrictSpan != null) {
@@ -1430,7 +1430,7 @@ public class ScrollView extends FrameLayout {
mFlingStrictSpan = StrictMode.enterCriticalSpan("ScrollView-fling");
}
invalidate();
postInvalidateOnAnimation();
}
}
@@ -1495,7 +1495,7 @@ public class ScrollView extends FrameLayout {
canvas.translate(mPaddingLeft, Math.min(0, scrollY));
mEdgeGlowTop.setSize(width, getHeight());
if (mEdgeGlowTop.draw(canvas)) {
invalidate();
postInvalidateOnAnimation();
}
canvas.restoreToCount(restoreCount);
}
@@ -1509,7 +1509,7 @@ public class ScrollView extends FrameLayout {
canvas.rotate(180, width, 0);
mEdgeGlowBottom.setSize(width, height);
if (mEdgeGlowBottom.draw(canvas)) {
invalidate();
postInvalidateOnAnimation();
}
canvas.restoreToCount(restoreCount);
}