@Override
protected void layoutChildren() {
super.layoutChildren();
if (mRequestedScrollPosition == -1) {
return;
}
final int position = mRequestedScrollPosition;
mRequestedScrollPosition = -1;
int firstPosition = getFirstVisiblePosition() + 1;
int lastPosition = getLastVisiblePosition();
if (position >= firstPosition && position <= lastPosition) {
return; // Already on screen
}
final int offset = (int) (getHeight() * PREFERRED_SELECTION_OFFSET_FROM_TOP);
if (!mSmoothScrollRequested) {
setSelectionFromTop(position, offset);
// Since we have changed the scrolling position, we need to redo child layout
// Calling "requestLayout" in the middle of a layout pass has no effect,
// so we call layoutChildren explicitly
super.layoutChildren();
} else {
// We will first position the list a couple of screens before or after
// the new selection and then scroll smoothly to it.
int twoScreens = (lastPosition - firstPosition) * 2;
int preliminaryPosition;
if (position < firstPosition) {
preliminaryPosition = position + twoScreens;
if (preliminaryPosition >= getCount()) {
preliminaryPosition = getCount() - 1;
}
if (preliminaryPosition < firstPosition) {
setSelection(preliminaryPosition);
super.layoutChildren();
}
} else {
preliminaryPosition = position - twoScreens;
if (preliminaryPosition < 0) {
preliminaryPosition = 0;
}
if (preliminaryPosition > lastPosition) {
setSelection(preliminaryPosition);
super.layoutChildren();
}
}
smoothScrollToPositionFromTop(position, offset);
}
}
@Override
protected void layoutChildren() {
// we need to control calls to layoutChildren while
// dragging to prevent things happening out of order
if (mFloatView == null) {
super.layoutChildren();
}
}
@Override
protected void layoutChildren() {
if (!mBlockLayoutChildren && !mBlockLayoutAndMeasure) {
super.layoutChildren();
}
}
@Override
public boolean onTouchEvent(MotionEvent ev) {
if (mGestureDetector != null) {
mGestureDetector.onTouchEvent(ev);
}
if ((mDragListener != null || mDropListener != null) && mFloatView != null) {
int action = ev.getAction();
final int x = (int) ev.getX();
final int y = (int) ev.getY();
switch (action & MotionEvent.ACTION_MASK) {
case MotionEvent.ACTION_UP:
case MotionEvent.ACTION_CANCEL:
Rect r = mTempRect;
mFloatView.getDrawingRect(r);
// mDragScroller.stopScrolling(true);
if (mRemoveMode == SLIDE && ev.getX() > r.right * 3 / 4) {
dropFloatView(true);
} else {
dropFloatView(false);
}
break;
case MotionEvent.ACTION_DOWN:
// doExpansion();
break;
case MotionEvent.ACTION_MOVE:
// make src item invisible on first move away from pickup
// point. Reduces flicker.
if (mLastY == mDownY) {
// should we be this careful?
final View item = getChildAt(mSrcDragPos - getFirstVisiblePosition());
if (item != null) {
item.setVisibility(INVISIBLE);
}
}
dragView(x, y);
if (!mDragScroller.isScrolling()) {
final int first = getFirstVisiblePosition();
final View startView = getChildAt(mExpDragPos - first);
int startPos;
int startTop;
if (startView == null) {
startPos = first + getChildCount() / 2;
startTop = getChildAt(startPos - first).getTop();
Log.d("mobeta", "startView was null");
} else {
startPos = mExpDragPos;
startTop = startView.getTop();
}
// Log.d("mobeta", "move shuffle");
boolean shuffled = shuffleItems(getFloatPosition(y, startPos, startTop));
if (shuffled) {
super.layoutChildren();
}
}
// get the current scroll direction
int currentScrollDir = mDragScroller.getScrollDir();
if (y > mLastY && y > mDownScrollStartY && currentScrollDir != DragScroller.DOWN) {
// dragged down, it is below the down scroll start and
// it is not scrolling up
if (currentScrollDir != DragScroller.STOP) {
// moved directly from up scroll to down scroll
mDragScroller.stopScrolling(true);
}
// start scrolling down
mDragScroller.startScrolling(DragScroller.DOWN);
} else if (y < mLastY && y < mUpScrollStartY && currentScrollDir != DragScroller.UP) {
// dragged up, it is above the up scroll start and it is
// not scrolling up
if (currentScrollDir != DragScroller.STOP) {
// moved directly from down scroll to up scroll
mDragScroller.stopScrolling(true);
}
// start scrolling up
mDragScroller.startScrolling(DragScroller.UP);
} else if (y >= mUpScrollStartY
&& y <= mDownScrollStartY
&& mDragScroller.isScrolling()) {
// not in the upper nor in the lower drag-scroll regions
// but it is still scrolling
mDragScroller.stopScrolling(true);
}
break;
}
mLastX = x;
mLastY = y;
return true;
}
return super.onTouchEvent(ev);
}