@Override
public void onDraw(Canvas c, RecyclerView parent, RecyclerView.State state) {
final RecyclerView.ViewHolder draggingItem = mDraggingItem;
if (draggingItem == null || draggingItem.getItemId() != mDraggingItemId) {
return;
}
final RecyclerView.ViewHolder swapTargetItem =
RecyclerViewDragDropManager.findSwapTargetItem(
mRecyclerView, draggingItem, mDraggingItemId, mTranslationY, mRange);
// reset Y-translation if the swap target has changed
if ((mSwapTargetItem != swapTargetItem) && (mSwapTargetItem != null)) {
setItemTranslationY(mRecyclerView, mSwapTargetItem, 0.0f);
}
if (swapTargetItem != null) {
mReqTranslationPhase = calculateTranslationPhase(draggingItem, swapTargetItem);
if (mSwapTargetItem != swapTargetItem) {
mCurTranslationPhase = mReqTranslationPhase;
} else {
// interpolate to make it moves smoothly
mCurTranslationPhase =
calculateCurrentTranslationPhase(mCurTranslationPhase, mReqTranslationPhase);
}
updateSwapTargetTranslation(draggingItem, swapTargetItem, mCurTranslationPhase);
}
mSwapTargetItem = swapTargetItem;
}
@Override
public void onViewRecycled(VH holder) {
if (isDragging()) {
if (holder == mDraggingItem) {
if (LOCAL_LOGI) {
Log.i(TAG, "a view holder object which is bound to currently dragging item is recycled");
}
mDraggingItem = null;
mDragDropManager.onDraggingItemViewRecycled();
}
}
super.onViewRecycled(holder);
}
@Override
public void onBindViewHolder(VH holder, int position) {
if (isDragging()) {
final long itemId = holder.getItemId();
final int origPosition =
convertToOriginalPosition(
position, mDraggingItemInitialPosition, mDraggingItemCurrentPosition);
if (itemId == mDraggingItemId && holder != mDraggingItem) {
if (mDraggingItem == null) {
if (LOCAL_LOGI) {
Log.i(TAG, "a new view holder object for the currently dragging item is assigned");
}
mDraggingItem = holder;
mDragDropManager.onNewDraggingItemViewBinded(holder);
} else {
Log.e(TAG, "an another view holder object for the currently dragging item is assigned");
}
}
int flags = RecyclerViewDragDropManager.STATE_FLAG_DRAGGING;
if (itemId == mDraggingItemId) {
flags |= RecyclerViewDragDropManager.STATE_FLAG_IS_ACTIVE;
}
if (mDraggableRange.checkInRange(position)) {
flags |= RecyclerViewDragDropManager.STATE_FLAG_IS_IN_RANGE;
}
safeUpdateFlags(holder, flags);
super.onBindViewHolder(holder, origPosition);
} else {
safeUpdateFlags(holder, 0);
super.onBindViewHolder(holder, position);
}
}
protected boolean isDragging() {
return mDragDropManager.isDragging();
}
private void cancelDrag() {
if (mDragDropManager != null) {
mDragDropManager.cancelDrag();
}
}