@Before
public void cleanState() {
mLog.setLength(0);
mPreLayoutItems = new ArrayList<TestAdapter.Item>();
mViewHolders = new ArrayList<MockViewHolder>();
mFirstPassUpdates = new ArrayList<AdapterHelper.UpdateOp>();
mSecondPassUpdates = new ArrayList<AdapterHelper.UpdateOp>();
mPreProcessClone = null;
mAdapterHelper =
new AdapterHelper(
new AdapterHelper.Callback() {
@Override
public RecyclerView.ViewHolder findViewHolder(int position) {
for (ViewHolder vh : mViewHolders) {
if (vh.mPosition == position && !vh.isRemoved()) {
return vh;
}
}
return null;
}
@Override
public void offsetPositionsForRemovingInvisible(int positionStart, int itemCount) {
final int positionEnd = positionStart + itemCount;
for (ViewHolder holder : mViewHolders) {
if (holder.mPosition >= positionEnd) {
holder.offsetPosition(-itemCount, true);
} else if (holder.mPosition >= positionStart) {
holder.flagRemovedAndOffsetPosition(positionStart - 1, -itemCount, true);
}
}
}
@Override
public void offsetPositionsForRemovingLaidOutOrNewView(
int positionStart, int itemCount) {
final int positionEnd = positionStart + itemCount;
for (ViewHolder holder : mViewHolders) {
if (holder.mPosition >= positionEnd) {
holder.offsetPosition(-itemCount, false);
} else if (holder.mPosition >= positionStart) {
holder.flagRemovedAndOffsetPosition(positionStart - 1, -itemCount, false);
}
}
}
@Override
public void markViewHoldersUpdated(int positionStart, int itemCount) {
final int positionEnd = positionStart + itemCount;
for (ViewHolder holder : mViewHolders) {
if (holder.mPosition >= positionStart && holder.mPosition < positionEnd) {
holder.addFlags(ViewHolder.FLAG_UPDATE);
}
}
}
@Override
public void onDispatchFirstPass(AdapterHelper.UpdateOp updateOp) {
if (DEBUG) {
log("first pass:"******"update op should not match any existing view holders",
viewHolder.getLayoutPosition() == updateOp.positionStart + i);
}
}
mFirstPassUpdates.add(updateOp);
}
@Override
public void onDispatchSecondPass(AdapterHelper.UpdateOp updateOp) {
if (DEBUG) {
log("second pass:" + updateOp.toString());
}
mSecondPassUpdates.add(updateOp);
}
@Override
public void offsetPositionsForAdd(int positionStart, int itemCount) {
for (ViewHolder holder : mViewHolders) {
if (holder != null && holder.mPosition >= positionStart) {
holder.offsetPosition(itemCount, false);
}
}
}
@Override
public void offsetPositionsForMove(int from, int to) {
final int start, end, inBetweenOffset;
if (from < to) {
start = from;
end = to;
inBetweenOffset = -1;
} else {
start = to;
end = from;
inBetweenOffset = 1;
}
for (ViewHolder holder : mViewHolders) {
if (holder == null || holder.mPosition < start || holder.mPosition > end) {
continue;
}
if (holder.mPosition == from) {
holder.offsetPosition(to - from, false);
} else {
holder.offsetPosition(inBetweenOffset, false);
}
}
}
},
true);
}
