protected boolean saveHistory(String expr, String result, boolean ensureResult) {
if (mHistory == null) {
return false;
}
expr = cleanExpression(expr);
if (!ensureResult
|| (!TextUtils.isEmpty(expr)
&& !TextUtils.isEmpty(result)
&& !Solver.equal(expr, result)
&& (mHistory.current() == null || !mHistory.current().getFormula().equals(expr)))) {
mHistory.enter(expr, result);
return true;
}
return false;
}
protected void incrementGroupId() {
mHistory.incrementGroupId();
}
@Override
protected void onResume() {
super.onResume();
// Load up to date history
mPersist = new Persist(this);
mPersist.load();
mHistory = mPersist.getHistory();
incrementGroupId();
// When history is open, the display is saved as a Display Entry. Cache it if it exists.
HistoryEntry displayEntry = null;
if (mHistoryAdapter != null) {
displayEntry = mHistoryAdapter.getDisplayEntry();
}
// Create a new History Adapter (with the up-to-date history)
mHistoryAdapter = new HistoryAdapter(this, mEvaluator.getSolver(), mHistory);
mHistoryAdapter.setOnItemClickListener(
new HistoryAdapter.OnItemClickListener() {
@Override
public void onItemClick(final HistoryEntry entry) {
mDisplayView.collapse(
new AnimationFinishedListener() {
@Override
public void onAnimationFinished() {
mFormulaEditText.setText(entry.getFormula());
}
});
}
});
mHistoryAdapter.setOnItemLongclickListener(
new HistoryAdapter.OnItemLongClickListener() {
@Override
public void onItemLongClick(HistoryEntry entry) {
Clipboard.copy(getBaseContext(), entry.getResult());
}
});
// Restore the Display Entry (if it existed)
if (displayEntry != null) {
mHistoryAdapter.setDisplayEntry(displayEntry.getFormula(), displayEntry.getResult());
}
// Observe! Set! Typical adapter stuff.
mHistory.setObserver(
new History.Observer() {
@Override
public void notifyDataSetChanged() {
mHistoryAdapter.notifyDataSetChanged();
}
});
mDisplayView.setAdapter(mHistoryAdapter);
mDisplayView.attachToRecyclerView(
new ItemTouchHelper(
new ItemTouchHelper.SimpleCallback(
ItemTouchHelper.LEFT | ItemTouchHelper.RIGHT,
ItemTouchHelper.LEFT | ItemTouchHelper.RIGHT) {
@Override
public boolean onMove(
RecyclerView recyclerView,
RecyclerView.ViewHolder viewHolder,
RecyclerView.ViewHolder target) {
return false;
}
@Override
public void onSwiped(RecyclerView.ViewHolder viewHolder, int direction) {
if (viewHolder.getAdapterPosition() < mHistory.getEntries().size()) {
HistoryEntry item = mHistory.getEntries().get(viewHolder.getAdapterPosition());
mHistory.remove(item);
mHistoryAdapter.notifyItemRemoved(viewHolder.getAdapterPosition());
}
}
}));
mDisplayView.scrollToMostRecent();
}