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finalcut/examples/calculator.cpp

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/***********************************************************************
* calculator.cpp - A simple calculator with trigonometric functions *
* *
* This file is part of the Final Cut widget toolkit *
* *
* Copyright 2016-2017 Markus Gans *
* *
* The Final Cut is free software; you can redistribute it and/or *
* modify it under the terms of the GNU Lesser General Public License *
* as published by the Free Software Foundation; either version 3 of *
* the License, or (at your option) any later version. *
* *
* The Final Cut is distributed in the hope that it will be useful, *
* but WITHOUT ANY WARRANTY; without even the implied warranty of *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
* GNU Lesser General Public License for more details. *
* *
* You should have received a copy of the GNU Lesser General Public *
* License along with this program. If not, see *
* <http://www.gnu.org/licenses/>. *
***********************************************************************/
#include <cfloat>
#include <cmath>
#include <cstdlib>
#include <limits>
#include <map>
#include <stack>
#include <final/final.h>
const lDouble PI = 3.141592653589793238L;
//----------------------------------------------------------------------
// class Button
//----------------------------------------------------------------------
#pragma pack(push)
#pragma pack(1)
class Button : public FButton
{
public:
// Constructor
explicit Button (FWidget* = 0);
// Method
void setChecked(bool);
// Event handler
void onKeyPress (FKeyEvent*);
private:
// Data Member
bool checked;
};
#pragma pack(pop)
//----------------------------------------------------------------------
Button::Button (FWidget* parent)
: FButton(parent)
, checked(false)
{ }
//----------------------------------------------------------------------
void Button::setChecked (bool on)
{
if ( checked == on )
return;
checked = on;
if ( checked )
{
setBackgroundColor(fc::Cyan);
setFocusForegroundColor(fc::White);
setFocusBackgroundColor(fc::Cyan);
}
else
{
setBackgroundColor(wc.button_active_bg);
setFocusForegroundColor(wc.button_active_focus_fg);
setFocusBackgroundColor(wc.button_active_focus_bg);
}
redraw();
}
//----------------------------------------------------------------------
void Button::onKeyPress (FKeyEvent* ev)
{
int key = ev->key();
// catch the enter key
if ( key == fc::Fkey_return || key == fc::Fkey_enter )
return;
FButton::onKeyPress(ev);
}
//----------------------------------------------------------------------
// class Calc
//----------------------------------------------------------------------
#pragma pack(push)
#pragma pack(1)
class Calc : public FDialog
{
public:
// Constructor
explicit Calc (FWidget* parent = 0);
// Destructor
~Calc();
// Event handlers
void onKeyPress (FKeyEvent*);
void onAccel (FAccelEvent*);
void onClose (FCloseEvent*);
// Callback method
void cb_buttonClicked (FWidget*, data_ptr);
private:
// Enumeration
enum button
{
Sine,
Cosine,
Tangent,
Reciprocal,
On,
Natural_logarithm,
Powers_of_e,
Power,
Square_root,
Divide,
Common_logarithm,
Powers_of_ten,
Parenthese_l,
Parenthese_r,
Multiply,
Hyperbolic,
Seven,
Eight,
Nine,
Subtract,
Arcus,
Four,
Five,
Six,
Add,
Pi,
One,
Two,
Three,
Percent,
Zero,
Decimal_point,
Change_sign,
Equals,
NUM_OF_BUTTONS
};
// Methods
void drawDispay();
virtual void draw();
void clear();
void zero();
void one();
void two();
void three();
void four();
void five();
void six();
void seven();
void eight();
void nine();
void add();
void subtract();
void multiply();
void divide();
void equals();
void change_sign (lDouble&);
void radix_point();
void reciprocal (lDouble&);
void percent (lDouble&);
void pi (lDouble&);
void open_bracket();
void close_bracket();
void log_e (lDouble&);
void power_e (lDouble&);
void log_10 (lDouble&);
void power_10 (lDouble&);
void power (lDouble&);
void square_root (lDouble&);
void hyperbolic (lDouble&);
void arcus (lDouble&);
void sine (lDouble&);
void cosine (lDouble&);
void tangent (lDouble&);
bool isDataEntryKey (int);
bool isOperatorKey (int);
lDouble& getValue();
void setDisplay (lDouble);
void setInfixOperator (char);
void clearInfixOperator();
void calcInfixOperator();
void adjustSize();
// Data Members
bool error;
bool arcus_mode;
bool hyperbolic_mode;
lDouble a, b;
lDouble infinity;
uInt max_char;
int last_key;
char infix_operator;
char last_infix_operator;
FString input;
int button_no[Calc::NUM_OF_BUTTONS];
struct stack_data
{
lDouble term;
char infix_operator;
};
std::stack<stack_data> bracket_stack;
std::map<Calc::button, Button*> calculator_buttons;
};
#pragma pack(pop)
//----------------------------------------------------------------------
Calc::Calc (FWidget* parent)
: FDialog(parent)
, error(false)
, arcus_mode(false)
, hyperbolic_mode(false)
, a(0.0L)
, b(0.0L)
, infinity(std::numeric_limits<lDouble>::infinity())
, max_char(33)
, last_key(-1)
, infix_operator('\0')
, last_infix_operator('\0')
, input("")
, bracket_stack()
, calculator_buttons()
{
clearInfixOperator();
const wchar_t* const button_text[Calc::NUM_OF_BUTTONS] =
{
L"&Sin",
L"&Cos",
L"&Tan",
L"1/&x",
L"&On",
L"L&n",
L"&e\x02e3",
L"&y\x02e3",
L"Sq&r",
L"&\xf7",
L"&Lg",
L"10&\x02e3",
L"&(",
L"&)",
L"&\xd7",
L"&Hyp",
L"&7",
L"&8",
L"&9",
L"&-",
L"&Arc",
L"&4",
L"&5",
L"&6",
L"&+",
L"&\x03c0",
L"&1",
L"&2",
L"&3",
L"&%",
L"&0",
L"&.",
L"&±",
L"&="
};
std::setlocale(LC_NUMERIC, "C");
setText ("Calculator");
setGeometry (19, 6, 37, 18);
addAccelerator('q'); // Press 'q' to quit
for (int key = 0; key < Calc::NUM_OF_BUTTONS; key++)
{
Button* btn = new Button(this);
button_no[key] = key;
if ( key == Equals )
btn->setGeometry(30, 15, 5, 3);
else
{
int x, y, n;
( key <= Three ) ? n = 0 : n = 1;
x = (key + n) % 5 * 7 + 2;
y = (key + n) / 5 * 2 + 3;
btn->setGeometry(x, y, 5, 1);
}
btn->setFlat();
btn->setNoUnderline();
btn->setText(button_text[key]);
btn->setDoubleFlatLine(fc::top);
btn->setDoubleFlatLine(fc::bottom);
if ( isNewFont() )
btn->unsetClickAnimation();
btn->addCallback
(
"clicked",
F_METHOD_CALLBACK (this, &Calc::cb_buttonClicked),
&button_no[key]
);
calculator_buttons[button(key)] = btn;
}
calculator_buttons[On]->addAccelerator(fc::Fkey_dc); // Del key
calculator_buttons[On]->setFocus();
calculator_buttons[Pi]->addAccelerator('p');
calculator_buttons[Power]->addAccelerator('^');
calculator_buttons[Divide]->addAccelerator('/');
calculator_buttons[Powers_of_ten]->addAccelerator('d');
calculator_buttons[Multiply]->addAccelerator('*');
calculator_buttons[Decimal_point]->addAccelerator(',');
calculator_buttons[Change_sign]->addAccelerator('#');
calculator_buttons[Equals]->addAccelerator(fc::Fkey_return);
calculator_buttons[Equals]->addAccelerator(fc::Fkey_enter);
}
//----------------------------------------------------------------------
Calc::~Calc()
{
}
//----------------------------------------------------------------------
void Calc::drawDispay()
{
FString display = input;
if ( display.isNull() || display.isEmpty() )
display = L'0';
if ( display.right(3) == L"-0." )
display = L'0';
if ( display.back() == L'.' && display.getLength() > 1 )
display = display.left(display.getLength() - 1);
if ( ! display.isEmpty() && display.getLength() < max_char )
display.insert(FString(max_char - display.getLength(), L' '), 0);
if ( display.getLength() > max_char )
display = display.left(max_char);
if ( infix_operator )
display[1] = infix_operator;
if ( error )
display = " Error ";
setColor(fc::Black, fc::LightGray);
if ( isMonochron() )
setReverse(false);
setPrintPos (3, 3);
print(display);
print(L' ');
setColor(wc.dialog_fg, wc.dialog_bg);
if ( isMonochron() )
setReverse(true);
if ( isNewFont() )
{
FString bottom_line (33, wchar_t(fc::NF_border_line_bottom));
setPrintPos (3, 2);
print (bottom_line);
setPrintPos (2, 3);
print (wchar_t(fc::NF_rev_border_line_right));
setPrintPos (36, 3);
print (wchar_t(fc::NF_border_line_left));
FString top_bottom_line_5 (5, wchar_t(fc::NF_border_line_up_and_down));
FString top_line_2 (2, wchar_t(fc::NF_border_line_upper));
setPrintPos (3, 4);
print ( top_bottom_line_5 + top_line_2
+ top_bottom_line_5 + top_line_2
+ top_bottom_line_5 + top_line_2
+ top_bottom_line_5 + top_line_2
+ top_bottom_line_5);
}
else
{
FString separator = FString(wchar_t(fc::BoxDrawingsVerticalAndRight))
+ FString(35, wchar_t(fc::BoxDrawingsHorizontal))
+ FString(wchar_t(fc::BoxDrawingsVerticalAndLeft));
setPrintPos (1, 4);
print(separator);
}
}
//----------------------------------------------------------------------
void Calc::clear()
{
error = false;
arcus_mode = false;
hyperbolic_mode = false;
calculator_buttons[Arcus]->setChecked(false);
calculator_buttons[Hyperbolic]->setChecked(false);
input = "";
clearInfixOperator();
last_infix_operator = '\0';
a = b = 0.0L;
}
//----------------------------------------------------------------------
void Calc::zero()
{
if ( input.getLength() >= max_char )
return;
if ( isDataEntryKey(last_key) )
input += '0';
else
input = '0';
}
//----------------------------------------------------------------------
void Calc::one()
{
if ( input.getLength() >= max_char )
return;
if ( isDataEntryKey(last_key) )
input += '1';
else
input = '1';
}
//----------------------------------------------------------------------
void Calc::two()
{
if ( input.getLength() >= max_char )
return;
if ( isDataEntryKey(last_key) )
input += '2';
else
input = '2';
}
//----------------------------------------------------------------------
void Calc::three()
{
if ( input.getLength() >= max_char )
return;
if ( isDataEntryKey(last_key) )
input += '3';
else
input = '3';
}
//----------------------------------------------------------------------
void Calc::four()
{
if ( input.getLength() >= max_char )
return;
if ( isDataEntryKey(last_key) )
input += '4';
else
input = '4';
}
//----------------------------------------------------------------------
void Calc::five()
{
if ( input.getLength() >= max_char )
return;
if ( isDataEntryKey(last_key) )
input += '5';
else
input = '5';
}
//----------------------------------------------------------------------
void Calc::six()
{
if ( input.getLength() >= max_char )
return;
if ( isDataEntryKey(last_key) )
input += '6';
else
input = '6';
}
//----------------------------------------------------------------------
void Calc::seven()
{
if ( input.getLength() >= max_char )
return;
if ( isDataEntryKey(last_key) )
input += '7';
else
input = '7';
}
//----------------------------------------------------------------------
void Calc::eight()
{
if ( input.getLength() >= max_char )
return;
if ( isDataEntryKey(last_key) )
input += '8';
else
input = '8';
}
//----------------------------------------------------------------------
void Calc::nine()
{
if ( input.getLength() >= max_char )
return;
if ( isDataEntryKey(last_key) )
input += '9';
else
input = '9';
}
//----------------------------------------------------------------------
void Calc::add()
{
if ( ! isOperatorKey(last_key) )
calcInfixOperator();
setDisplay(a);
setInfixOperator('+');
}
//----------------------------------------------------------------------
void Calc::subtract()
{
if ( ! isOperatorKey(last_key) )
calcInfixOperator();
setDisplay(a);
setInfixOperator('-');
}
//----------------------------------------------------------------------
void Calc::multiply()
{
if ( ! isOperatorKey(last_key) )
calcInfixOperator();
setDisplay(a);
setInfixOperator('*');
}
//----------------------------------------------------------------------
void Calc::divide()
{
if ( ! isOperatorKey(last_key) )
calcInfixOperator();
setDisplay(a);
setInfixOperator('/');
}
//----------------------------------------------------------------------
void Calc::equals()
{
infix_operator = last_infix_operator;
calcInfixOperator();
setDisplay(a);
}
//----------------------------------------------------------------------
void Calc::change_sign (lDouble& x)
{
x *= -1.0L;
setDisplay(x);
}
//----------------------------------------------------------------------
void Calc::radix_point()
{
if ( ! input.includes('.') )
input += '.';
}
//----------------------------------------------------------------------
void Calc::reciprocal (lDouble& x)
{
if ( std::fabs(x) < LDBL_EPSILON ) // x == 0
error = true;
else
{
x = 1 / x;
setDisplay(x);
}
}
//----------------------------------------------------------------------
void Calc::percent (lDouble& x)
{
infix_operator = last_infix_operator;
x /= 100.0L;
setDisplay(x);
}
//----------------------------------------------------------------------
void Calc::pi (lDouble& x)
{
x = PI;
setDisplay(x);
}
//----------------------------------------------------------------------
void Calc::open_bracket()
{
stack_data d = { a, infix_operator };
bracket_stack.push(d);
clearInfixOperator();
input = "";
a = b = 0.0L;
setDisplay(a);
}
//----------------------------------------------------------------------
void Calc::close_bracket()
{
if ( bracket_stack.empty() )
return;
calcInfixOperator();
setDisplay(a);
stack_data d = bracket_stack.top();
bracket_stack.pop();
b = d.term;
infix_operator = d.infix_operator;
last_infix_operator = infix_operator;
}
//----------------------------------------------------------------------
void Calc::log_e (lDouble& x)
{
x = std::log(x);
if ( errno == EDOM || errno == ERANGE )
error = true;
setDisplay(x);
}
//----------------------------------------------------------------------
void Calc::power_e (lDouble& x)
{
x = std::exp(x);
if ( errno == ERANGE )
error = true;
setDisplay(x);
}
//----------------------------------------------------------------------
void Calc::log_10 (lDouble& x)
{
x = std::log10(x);
if ( errno == EDOM || errno == ERANGE )
error = true;
setDisplay(x);
}
//----------------------------------------------------------------------
void Calc::power_10 (lDouble& x)
{
x = std::pow(10, x);
if ( errno == EDOM || errno == ERANGE )
error = true;
setDisplay(x);
}
//----------------------------------------------------------------------
void Calc::power (lDouble& x)
{
if ( ! isOperatorKey(last_key) )
calcInfixOperator();
setDisplay(x);
setInfixOperator('^');
}
//----------------------------------------------------------------------
void Calc::square_root (lDouble& x)
{
x = std::sqrt(x);
if ( errno == EDOM || errno == ERANGE )
error = true;
setDisplay(x);
}
//----------------------------------------------------------------------
void Calc::hyperbolic (lDouble& x)
{
hyperbolic_mode = ! hyperbolic_mode;
calculator_buttons[Hyperbolic]->setChecked(hyperbolic_mode);
setDisplay(x);
}
//----------------------------------------------------------------------
void Calc::arcus (lDouble& x)
{
arcus_mode = ! arcus_mode;
calculator_buttons[Arcus]->setChecked(arcus_mode);
setDisplay(x);
}
//----------------------------------------------------------------------
void Calc::sine (lDouble& x)
{
if ( hyperbolic_mode )
{
if ( arcus_mode )
{
x = std::log(x + std::sqrt(x * x + 1));
if ( errno == EDOM || errno == ERANGE )
error = true;
if ( std::fabs(x - infinity) < LDBL_EPSILON ) // x = ∞
error = true;
}
else
x = std::sinh(x);
}
else
{
if ( arcus_mode )
x = std::asin(x) * 180.0L / PI;
else if ( std::fabs(std::fmod(x, 180.0L)) < LDBL_EPSILON ) // x / 180 = 0
x = 0.0L;
else
x = std::sin(x * PI / 180.0L);
}
if ( errno == EDOM )
error = true;
setDisplay(x);
arcus_mode = false;
hyperbolic_mode = false;
calculator_buttons[Arcus]->setChecked(false);
calculator_buttons[Hyperbolic]->setChecked(false);
}
//----------------------------------------------------------------------
void Calc::cosine (lDouble& x)
{
if ( hyperbolic_mode )
{
if ( arcus_mode )
{
x = std::log(x + std::sqrt(x * x - 1));
if ( errno == EDOM || errno == ERANGE )
error = true;
if ( std::fabs(x - infinity) < LDBL_EPSILON ) // x = ∞
error = true;
}
else
x = std::cosh(x);
}
else
{
if ( arcus_mode )
x = std::acos(x) * 180.0L / PI;
else if ( std::fabs(std::fmod(x - 90.0L, 180.0L)) < LDBL_EPSILON ) // (x - 90) / 180 == 0
x = 0.0L;
else
x = std::cos(x * PI / 180.0L);
}
if ( errno == EDOM )
error = true;
setDisplay(x);
arcus_mode = false;
hyperbolic_mode = false;
calculator_buttons[Arcus]->setChecked(false);
calculator_buttons[Hyperbolic]->setChecked(false);
}
//----------------------------------------------------------------------
void Calc::tangent (lDouble& x)
{
if ( hyperbolic_mode )
{
if ( arcus_mode )
if ( x < 1 )
{
x = 0.5L * std::log((1 + x) / (1 - x));
if ( errno == EDOM || errno == ERANGE )
error = true;
}
else
error = true;
else
x = std::tanh(x);
}
else
{
if ( arcus_mode )
x = std::atan(x) * 180.0L / PI;
else
// Test if (x / 180) != 0 and x / 90 == 0
if ( std::fabs(std::fmod(x, 180.0L)) > LDBL_EPSILON
&& std::fabs(std::fmod(x, 90.0L)) < LDBL_EPSILON )
error = true;
else if ( std::fabs(std::fmod(x, 180.0L)) < LDBL_EPSILON ) // x / 180 == 0
x = 0.0L;
else
x = std::tan(x * PI / 180.0L);
}
if ( errno == EDOM )
error = true;
setDisplay(x);
arcus_mode = false;
hyperbolic_mode = false;
calculator_buttons[Arcus]->setChecked(false);
calculator_buttons[Hyperbolic]->setChecked(false);
}
//----------------------------------------------------------------------
void Calc::draw()
{
setBold();
setColor (fc::Blue, fc::Cyan);
clearArea (vdesktop, fc::MediumShade);
unsetBold();
FDialog::draw();
drawDispay();
}
//----------------------------------------------------------------------
bool Calc::isDataEntryKey (int key)
{
// Test if key is in {'.', '0'..'9'}
int data_entry_keys[] =
{
Decimal_point,
Zero,
One,
Two,
Three,
Four,
Five,
Six,
Seven,
Eight,
Nine
};
int* iter = std::find (data_entry_keys, data_entry_keys + 11, key);
if ( iter != data_entry_keys + 11 )
return true;
else
return false;
}
//----------------------------------------------------------------------
bool Calc::isOperatorKey(int key)
{
// Test if key is in {'*', '/', '+', '-', '^', '='}
int operators[] =
{
Multiply,
Divide,
Add,
Subtract,
Power,
Equals
};
int* iter = std::find (operators, operators + 6, key);
if ( iter != operators + 6 )
return true;
else
return false;
}
//----------------------------------------------------------------------
lDouble& Calc::getValue()
{
if ( infix_operator )
return b;
else
return a;
}
//----------------------------------------------------------------------
void Calc::setDisplay (lDouble d)
{
char buffer[33];
snprintf (buffer, sizeof(buffer), "%32.11Lg", d);
input = buffer;
}
//----------------------------------------------------------------------
inline void Calc::setInfixOperator(char c)
{
infix_operator = c;
last_infix_operator = infix_operator;
}
//----------------------------------------------------------------------
inline void Calc::clearInfixOperator()
{
infix_operator = '\0';
}
//----------------------------------------------------------------------
void Calc::calcInfixOperator()
{
switch ( infix_operator )
{
case '*':
if ( std::fabs(a) > LDBL_EPSILON ) // a != 0.0L
{
// ln(a * b) = ln(a) + ln(b)
if ( std::log(std::abs(a)) + std::log(std::abs(b)) <= std::log(LDBL_MAX) )
a *= b;
else
error = true;
}
else
b = 0.0L;
break;
case '/':
if ( std::fabs(b) > LDBL_EPSILON ) // b != 0.0L
a /= b;
else
error = true;
break;
case '+':
if ( std::fabs(a) > LDBL_EPSILON ) // a != 0.0L
{
if ( std::log(std::abs(a)) + std::log(std::abs(1 + b / a)) <= std::log(LDBL_MAX) )
a += b;
else
error = true;
}
else
a = b;
break;
case '-':
if ( std::fabs(b) > LDBL_EPSILON ) // b != 0.0L
{
if ( std::log(std::abs(a)) + std::log(std::abs(1 - b / a)) <= std::log(LDBL_MAX) )
a -= b;
else
error = true;
}
else
a = b * (-1.0L);
break;
case '^':
a = std::pow(a, b);
if ( errno == EDOM || errno == ERANGE )
error = true;
break;
default:
break;
}
clearInfixOperator();
}
//----------------------------------------------------------------------
void Calc::onKeyPress (FKeyEvent* ev)
{
int len = int(input.getLength());
int key = ev->key();
switch ( key )
{
case fc::Fkey_erase:
case fc::Fkey_backspace:
if ( len > 0 )
{
if ( len == 1 )
input = "";
else
input = input.left(input.getLength() - 1);
lDouble& x = getValue();
x = lDouble(std::atof(input.c_str()));
drawDispay();
updateTerminal();
}
ev->accept();
break;
case fc::Fkey_escape:
case fc::Fkey_escape_mintty:
{
FAccelEvent a_ev(fc::Accelerator_Event, getFocusWidget());
calculator_buttons[On]->onAccel(&a_ev);
}
ev->accept();
break;
default:
FDialog::onKeyPress(ev);
break;
}
}
//----------------------------------------------------------------------
void Calc::onAccel (FAccelEvent* ev)
{
close();
ev->accept();
}
//----------------------------------------------------------------------
void Calc::onClose (FCloseEvent* ev)
{
FApplication::closeConfirmationDialog (this, ev);
}
//----------------------------------------------------------------------
void Calc::cb_buttonClicked (FWidget*, data_ptr data)
{
lDouble& x = getValue();
int key = *(static_cast<int*>(data));
switch ( key )
{
case Sine:
sine(x); // sin
break;
case Cosine:
cosine(x); // cos
break;
case Tangent:
tangent(x); // tan
break;
case Reciprocal:
reciprocal(x); // 1 / x
break;
case On:
clear();
break;
case Natural_logarithm:
log_e(x); // ln
break;
case Powers_of_e:
power_e(x); // eˣ
break;
case Power:
power(x); // yˣ
break;
case Square_root:
square_root(x); // sqrt
break;
case Divide:
divide(); // ÷
break;
case Common_logarithm:
log_10(x); // lg
break;
case Powers_of_ten:
power_10(x); // 10ˣ
break;
case Parenthese_l:
open_bracket(); // (
break;
case Parenthese_r:
close_bracket(); // )
break;
case Multiply:
multiply(); // *
break;
case Hyperbolic:
hyperbolic(x); // hyp
break;
case Seven:
seven(); // 7
break;
case Eight:
eight(); // 8
break;
case Nine:
nine(); // 9
break;
case Subtract:
subtract(); // -
break;
case Arcus:
arcus(x); // arc
break;
case Four:
four(); // 4
break;
case Five:
five(); // 5
break;
case Six:
six(); // 6
break;
case Add:
add(); // +
break;
case Pi:
pi(x); // π
break;
case One:
one(); // 1
break;
case Two:
two(); // 2
break;
case Three:
three(); // 3
break;
case Percent:
percent(x); // %
break;
case Zero:
zero(); // 0
break;
case Decimal_point:
radix_point(); // .
break;
case Change_sign:
change_sign(x); // ±
break;
case Equals:
equals(); // =
break;
default:
break;
} // end of switch
if ( ! input.isEmpty() )
{
if ( isDataEntryKey(key) )
x = lDouble(input.toDouble());
else
{
// remove trailing zeros
while ( ! input.includes(L'e')
&& input.includes(L'.')
&& input.back() == L'0' )
input = input.left(input.getLength() - 1);
}
}
drawDispay();
updateTerminal();
if ( infix_operator && ! isDataEntryKey(key) )
input = "";
last_key = key;
}
//----------------------------------------------------------------------
void Calc::adjustSize()
{
int pw = getParentWidget()->getWidth();
int ph = getParentWidget()->getHeight();
setX (1 + (pw - getWidth()) / 2, false);
setY (1 + (ph - getHeight()) / 2, false);
FDialog::adjustSize();
}
//----------------------------------------------------------------------
// main part
//----------------------------------------------------------------------
int main (int argc, char* argv[])
{
// Create the application object
FApplication app(argc, argv);
// Create a calculator object
Calc calculator(&app);
// Set calculator object as main widget
app.setMainWidget(&calculator);
// Show and start the application
calculator.show();
return app.exec();
}
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