private void completeScroll() {
boolean needPopulate = mScrolling;
if (needPopulate) {
// Done with scroll, no longer want to cache view drawing.
setDrawingCacheEnabled(false);
mScroller.abortAnimation();
int oldX = getScrollX();
int oldY = getScrollY();
int x = mScroller.getCurrX();
int y = mScroller.getCurrY();
if (oldX != x || oldY != y) {
scrollTo(x, y);
}
if (mIsOpen) {
if (mOnInteractListener != null) {
mOnInteractListener.onOpened();
}
} else {
if (mOnInteractListener != null) {
mOnInteractListener.onClosed();
}
}
}
mScrolling = false;
}
private void switchLayer(
final boolean open,
final boolean smoothAnim,
final boolean forceSwitch,
final int velocityX,
final int velocityY) {
if (!forceSwitch && open == mIsOpen) {
setDrawingCacheEnabled(false);
return;
}
if (open) {
if (mOnInteractListener != null) {
mOnInteractListener.onOpen();
}
} else {
if (mOnInteractListener != null) {
mOnInteractListener.onClose();
}
}
mIsOpen = open;
// Get translation values
float tx = mLastX - getWidth() / 2;
float ty = mLastY - getHeight() / 2;
// Get boolean for velocity check
boolean noVelocityInStickToMidle =
mScreenSide == STICK_TO_MIDDLE
&& Math.abs(velocityX) < mMinimumVelocity
&& Math.abs(velocityY) < mMinimumVelocity;
// Follow velocity or translation depending on the case
int dx = noVelocityInStickToMidle ? (int) tx : velocityX;
int dy = noVelocityInStickToMidle ? (int) ty : velocityY;
final int pos[] = getDestScrollPos(dx, dy);
if (smoothAnim) {
smoothScrollTo(pos[0], pos[1], Math.max(velocityX, velocityY));
} else {
completeScroll();
scrollTo(pos[0], pos[1]);
}
}
/**
* Like {@link View#scrollBy}, but scroll smoothly instead of immediately.
*
* @param x the number of pixels to scroll by on the X axis
* @param y the number of pixels to scroll by on the Y axis
* @param velocity the velocity associated with a fling, if applicable. (0 otherwise)
*/
void smoothScrollTo(int x, int y, int velocity) {
if (getChildCount() == 0) {
setDrawingCacheEnabled(false);
return;
}
int sx = getScrollX();
int sy = getScrollY();
int dx = x - sx;
int dy = y - sy;
if (dx == 0 && dy == 0) {
completeScroll();
if (mIsOpen) {
if (mOnInteractListener != null) {
mOnInteractListener.onOpened();
}
} else {
if (mOnInteractListener != null) {
mOnInteractListener.onClosed();
}
}
return;
}
setDrawingCacheEnabled(true);
mScrolling = true;
final int width = getWidth();
final int halfWidth = width / 2;
final float distanceRatio = Math.min(1f, 1.0f * Math.abs(dx) / width);
final float distance = halfWidth + halfWidth * distanceInfluenceForSnapDuration(distanceRatio);
int duration = 0;
velocity = Math.abs(velocity);
if (velocity > 0) {
duration = 4 * Math.round(1000 * Math.abs(distance / velocity));
} else {
duration = MAX_SCROLLING_DURATION;
}
duration = Math.min(duration, MAX_SCROLLING_DURATION);
mScroller.startScroll(sx, sy, dx, dy, duration);
invalidate();
}
