void
CalcView::Evaluate()
{
BString expression = fExpressionTextView->Text();
if (expression.Length() == 0) {
beep();
return;
}
_AudioFeedback(false);
// evaluate expression
BString value;
try {
ExpressionParser parser;
parser.SetDegreeMode(fOptions->degree_mode);
value = parser.Evaluate(expression.String());
} catch (ParseException e) {
BString error(e.message.String());
error << " at " << (e.position + 1);
fExpressionTextView->SetText(error.String());
return;
}
// render new result to display
fExpressionTextView->SetValue(value.String());
}
void
CalcView::Evaluate()
{
if (fExpressionTextView->TextLength() == 0) {
beep();
return;
}
fEvaluateThread = spawn_thread(_EvaluateThread, "Evaluate Thread",
B_LOW_PRIORITY, this);
if (fEvaluateThread < B_OK) {
// failed to create evaluate thread, error out
fExpressionTextView->SetText(strerror(fEvaluateThread));
return;
}
_AudioFeedback(false);
_SetEnabled(false);
// Disable input while we evaluate
status_t threadStatus = resume_thread(fEvaluateThread);
if (threadStatus != B_OK) {
// evaluate thread failed to start, error out
fExpressionTextView->SetText(strerror(threadStatus));
_SetEnabled(true);
return;
}
if (fEvaluateMessageRunner == NULL) {
BMessage message(kMsgCalculating);
fEvaluateMessageRunner = new (std::nothrow) BMessageRunner(
BMessenger(this), &message, kCalculatingInterval, 1);
status_t runnerStatus = fEvaluateMessageRunner->InitCheck();
if (runnerStatus != B_OK)
printf("Evaluate Message Runner: %s\n", strerror(runnerStatus));
}
}
void
CalcView::_PressKey(int key)
{
assert(key < (fRows * fColumns));
assert(key >= 0);
if (strcmp(fKeypad[key].label, "BS") == 0) {
// BS means backspace
fExpressionTextView->BackSpace();
} else if (strcmp(fKeypad[key].label, "C") == 0) {
// C means clear
fExpressionTextView->Clear();
} else if (strcmp(fKeypad[key].label, "acos") == 0
|| strcmp(fKeypad[key].label, "asin") == 0
|| strcmp(fKeypad[key].label, "atan") == 0
|| strcmp(fKeypad[key].label, "cbrt") == 0
|| strcmp(fKeypad[key].label, "ceil") == 0
|| strcmp(fKeypad[key].label, "cos") == 0
|| strcmp(fKeypad[key].label, "cosh") == 0
|| strcmp(fKeypad[key].label, "exp") == 0
|| strcmp(fKeypad[key].label, "floor") == 0
|| strcmp(fKeypad[key].label, "log") == 0
|| strcmp(fKeypad[key].label, "ln") == 0
|| strcmp(fKeypad[key].label, "sin") == 0
|| strcmp(fKeypad[key].label, "sinh") == 0
|| strcmp(fKeypad[key].label, "sqrt") == 0
|| strcmp(fKeypad[key].label, "tan") == 0
|| strcmp(fKeypad[key].label, "tanh") == 0) {
int32 labelLen = strlen(fKeypad[key].label);
int32 startSelection = 0;
int32 endSelection = 0;
fExpressionTextView->GetSelection(&startSelection, &endSelection);
if (endSelection > startSelection) {
// There is selected text, put it inbetween the parens
fExpressionTextView->Insert(startSelection, fKeypad[key].label,
labelLen);
fExpressionTextView->Insert(startSelection + labelLen, "(", 1);
fExpressionTextView->Insert(endSelection + labelLen + 1, ")", 1);
// Put the cursor after the ending paren
// Need to cast to BTextView because Select() is protected
// in the InputTextView class
static_cast<BTextView*>(fExpressionTextView)->Select(
endSelection + labelLen + 2, endSelection + labelLen + 2);
} else {
// There is no selected text, insert at the cursor location
fExpressionTextView->Insert(fKeypad[key].label);
fExpressionTextView->Insert("()");
// Put the cursor inside the parens so you can enter an argument
// Need to cast to BTextView because Select() is protected
// in the InputTextView class
static_cast<BTextView*>(fExpressionTextView)->Select(
endSelection + labelLen + 1, endSelection + labelLen + 1);
}
} else {
// check for evaluation order
if (fKeypad[key].code[0] == '\n') {
fExpressionTextView->ApplyChanges();
} else {
// insert into expression text
fExpressionTextView->Insert(fKeypad[key].code);
}
}
_AudioFeedback(true);
}
