@Override
public void onBackPressed() {
if (mDisplayView.isExpanded()) {
mDisplayView.collapse();
} else if (mPadViewPager != null && mPadViewPager.isExpanded()) {
mPadViewPager.collapse();
} else {
super.onBackPressed();
}
}
protected void initialize(Bundle savedInstanceState) {
// Rebuild constants. If the user changed their locale, it won't kill the app
// but it might change a decimal point from . to ,
Constants.rebuildConstants();
mDisplayView = (DisplayOverlay) findViewById(R.id.display);
mDisplayView.setFade(findViewById(R.id.history_fade));
mDisplayForeground = (ViewGroup) findViewById(R.id.the_clear_animation);
mFormulaEditText = (CalculatorEditText) findViewById(R.id.formula);
mResultEditText = (CalculatorEditText) findViewById(R.id.result);
mPadViewPager = (CalculatorPadView) findViewById(R.id.pad_pager);
mDeleteButton = findViewById(R.id.del);
mClearButton = findViewById(R.id.clr);
mEqualButton = (EqualsImageButton) findViewById(R.id.pad_numeric).findViewById(R.id.eq);
if (mEqualButton == null || mEqualButton.getVisibility() != View.VISIBLE) {
mEqualButton = (EqualsImageButton) findViewById(R.id.pad_operator).findViewById(R.id.eq);
}
mTokenizer = new CalculatorExpressionTokenizer(this);
mEvaluator = new CalculatorExpressionEvaluator(mTokenizer);
setState(
CalculatorState.values()[
savedInstanceState.getInt(KEY_CURRENT_STATE, CalculatorState.INPUT.ordinal())]);
mFormulaEditText.setSolver(mEvaluator.getSolver());
mResultEditText.setSolver(mEvaluator.getSolver());
mFormulaEditText.setText(
mTokenizer.getLocalizedExpression(
savedInstanceState.getString(KEY_CURRENT_EXPRESSION, "")));
mFormulaEditText.addTextChangedListener(mFormulaTextWatcher);
mFormulaEditText.setOnKeyListener(mFormulaOnKeyListener);
mFormulaEditText.setOnTextSizeChangeListener(this);
mDeleteButton.setOnLongClickListener(this);
mResultEditText.setEnabled(false);
findViewById(R.id.lparen).setOnLongClickListener(this);
findViewById(R.id.rparen).setOnLongClickListener(this);
findViewById(R.id.fun_sin).setOnLongClickListener(this);
findViewById(R.id.fun_cos).setOnLongClickListener(this);
findViewById(R.id.fun_tan).setOnLongClickListener(this);
// Disable IME for this application
getWindow()
.setFlags(
WindowManager.LayoutParams.FLAG_ALT_FOCUSABLE_IM,
WindowManager.LayoutParams.FLAG_ALT_FOCUSABLE_IM);
Button dot = (Button) findViewById(R.id.dec_point);
dot.setText(String.valueOf(Constants.DECIMAL_POINT));
}
@Override
public void onEvaluate(String expr, String result, int errorResourceId) {
if (mCurrentState == CalculatorState.INPUT || mCurrentState == CalculatorState.GRAPHING) {
if (result == null || Solver.equal(result, expr)) {
mResultEditText.setText(null);
} else {
mResultEditText.setText(result);
}
} else if (errorResourceId != INVALID_RES_ID) {
onError(errorResourceId);
} else if (saveHistory(expr, result, true)) {
mDisplayView.scrollToMostRecent();
onResult(result);
} else if (mCurrentState == CalculatorState.EVALUATE) {
// The current expression cannot be evaluated -> return to the input state.
setState(CalculatorState.INPUT);
}
invalidateEqualsButton();
}
@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();
}