public boolean onInterceptTouchEvent(MotionEvent ev) {
final int action = ev.getAction();
switch (action) {
case MotionEvent.ACTION_DOWN:
mLastY = ev.getY();
mDragging = false;
View view = mCallback.getChildAtPosition(ev);
if (view instanceof SwipeableItemView) {
mCurrView = (SwipeableItemView) view;
} else {
// If the touched item is not a swipeable one, clean the cache in
// mCurrView to make sure nothing will be swiped for this action
mCurrView = null;
}
mVelocityTracker.clear();
if (mCurrView != null) {
mCurrAnimView = mCurrView.getSwipeableView().getView();
mCanCurrViewBeDimissed = mCallback.canChildBeDismissed(mCurrView);
mVelocityTracker.addMovement(ev);
mInitialTouchPosX = ev.getX();
mInitialTouchPosY = ev.getY();
}
mCallback.cancelDismissCounter();
break;
case MotionEvent.ACTION_MOVE:
if (mCurrView != null) {
// Check the movement direction.
if (mLastY >= 0 && !mDragging) {
float currY = ev.getY();
float currX = ev.getX();
float deltaY = Math.abs(currY - mInitialTouchPosY);
float deltaX = Math.abs(currX - mInitialTouchPosX);
if (deltaY > mCurrView.getMinAllowScrollDistance() && deltaY > (FACTOR * deltaX)) {
mLastY = ev.getY();
mCallback.onScroll();
return false;
}
}
mVelocityTracker.addMovement(ev);
float pos = ev.getX();
float delta = pos - mInitialTouchPosX;
if (Math.abs(delta) > mPagingTouchSlop) {
mCallback.onBeginDrag(mCurrView.getSwipeableView().getView());
mPrevView = mCallback.getLastSwipedItem();
mDragging = true;
mInitialTouchPosX = ev.getX() - mCurrAnimView.getTranslationX();
mInitialTouchPosY = ev.getY();
}
}
mLastY = ev.getY();
break;
case MotionEvent.ACTION_UP:
case MotionEvent.ACTION_CANCEL:
mDragging = false;
mCurrView = null;
mCurrAnimView = null;
mLastY = -1;
break;
}
return mDragging;
}
