private boolean onFling(float velocityY) {
if (getHeight() == 0) {
return false;
}
float velocity = -velocityY / getHeight() * 180f;
velocity = Math.max(MIN_FLING_VELOCITY, Math.abs(velocity)) * Math.signum(velocity);
return flingAnimation.fling(velocity);
}
protected void animateFold(float to) {
final float from = getFoldRotation();
final long duration = (long) Math.abs(ANIMATION_DURATION_PER_ITEM * (to - from) / 180f);
flingAnimation.stop();
animator.cancel();
animator.setFloatValues(from, to);
animator.setDuration(duration);
animator.start();
}
protected void setFoldRotation(float rotation, boolean isFromUser) {
if (isFromUser) {
animator.cancel();
flingAnimation.stop();
}
rotation = Math.min(Math.max(minRotation, rotation), maxRotation);
foldRotation = rotation;
final int firstVisiblePosition = (int) (rotation / 180f);
final float localRotation = rotation % 180f;
final int totalCount = getCount();
FoldableItemLayout firstLayout = null;
FoldableItemLayout secondLayout = null;
if (firstVisiblePosition < totalCount) {
firstLayout = getLayoutForItem(firstVisiblePosition);
firstLayout.setFoldRotation(localRotation);
onFoldRotationChanged(firstLayout, firstVisiblePosition);
}
if (firstVisiblePosition + 1 < totalCount) {
secondLayout = getLayoutForItem(firstVisiblePosition + 1);
secondLayout.setFoldRotation(localRotation - 180f);
onFoldRotationChanged(secondLayout, firstVisiblePosition + 1);
}
boolean isReversedOrder = localRotation <= 90f;
if (isReversedOrder) {
backLayout = secondLayout;
frontLayout = firstLayout;
} else {
backLayout = firstLayout;
frontLayout = secondLayout;
}
if (foldRotationListener != null) {
foldRotationListener.onFoldRotation(rotation, isFromUser);
}
// When hardware acceleration is enabled view may not be invalidated and redrawn,
// but we need it to properly draw animation
invalidate();
}
private void onUpOrCancel() {
if (!flingAnimation.isAnimating()) {
scrollToNearestPosition();
}
}
private boolean onDown() {
isScrollDetected = false;
animator.cancel();
flingAnimation.stop();
return false;
}
