void preProcess() {
for (MockViewHolder vh : mViewHolders) {
final int ind = mTestAdapter.mItems.indexOf(vh.mItem);
assertEquals(
"actual adapter position should match",
ind,
mAdapterHelper.applyPendingUpdatesToPosition(vh.mPosition));
}
mAdapterHelper.preProcess();
for (int i = 0; i < mPreProcessClone.mItems.size(); i++) {
TestAdapter.Item item = mPreProcessClone.mItems.get(i);
final int preLayoutIndex = mPreLayoutItems.indexOf(item);
final int endIndex = mTestAdapter.mItems.indexOf(item);
if (preLayoutIndex != -1) {
assertEquals(
"find position offset should work properly for existing elements"
+ i
+ " at pre layout position "
+ preLayoutIndex
+ " and post layout position "
+ endIndex,
endIndex,
mAdapterHelper.findPositionOffset(preLayoutIndex));
}
}
// make sure visible view holders still have continuous positions
final StringBuilder vhLogBuilder = new StringBuilder();
for (ViewHolder vh : mViewHolders) {
vhLogBuilder.append("\n").append(vh.toString());
}
if (mViewHolders.size() > 0) {
final String vhLog = vhLogBuilder.toString();
final int start = mViewHolders.get(0).getLayoutPosition();
for (int i = 1; i < mViewHolders.size(); i++) {
assertEquals(
"view holder positions should be continious in pre-layout" + vhLog,
start + i,
mViewHolders.get(i).getLayoutPosition());
}
}
mAdapterHelper.consumePostponedUpdates();
// now assert these two adapters have identical data.
mPreProcessClone.applyOps(mFirstPassUpdates, mTestAdapter);
mPreProcessClone.applyOps(mSecondPassUpdates, mTestAdapter);
assertAdaptersEqual(mTestAdapter, mPreProcessClone);
}
private void animateAddImpl(final ViewHolder holder) {
final View view = holder.itemView;
final ViewPropertyAnimatorCompat animation = ViewCompat.animate(view);
mAddAnimations.add(holder);
float startX, startY;
int position = (int) view.getTag();
if (position % 2 == 0) {
startY = -100;
startX = -width;
} else {
startY = 100;
startX = width;
}
Log.d("test", String.valueOf(holder.getLayoutPosition()));
ViewCompat.setTranslationX(view, startX);
// 应该是相对偏移
ViewCompat.setTranslationY(view, startY);
ViewCompat.setAlpha(view, 0);
animation.setInterpolator(new OvershootInterpolator());
animation
.alpha(1)
.translationX(0)
.translationY(0)
.setDuration(getAddDuration())
.setListener(
new VpaListenerAdapter() {
@Override
public void onAnimationStart(View view) {
dispatchAddStarting(holder);
}
@Override
public void onAnimationCancel(View view) {
ViewCompat.setAlpha(view, 1);
}
@Override
public void onAnimationEnd(View view) {
animation.setListener(null);
dispatchAddFinished(holder);
mAddAnimations.remove(holder);
dispatchFinishedWhenDone();
// 使用这个来复原
ViewCompat.setTranslationY(view, 0);
}
})
.start();
}
public static boolean isRemoved(ViewHolder holder) {
return holder.isRemoved();
}
