Вот исходники из книги Шлее, попроще чем у Бланшетт:
Calculator.h
| Код |
#ifndef _Calculator_h_
#define _Calculator_h_
#include <QWidget>
#include <QStack>
class QLCDNumber;
class QPushButton;
// ======================================================================
class Calculator : public QWidget {
Q_OBJECT
private:
QLCDNumber* m_plcd;
QStack<QString> m_stk;
public:
Calculator(QWidget* pwgt = 0);
QPushButton* createButton(const QString& str);
void calculate ( );
public slots:
void slotButtonClicked();
};
#endif //_Calculator_h_
|
Calculator.cpp
| Код |
#include <QtGui>
#include "Calculator.h"
// ----------------------------------------------------------------------
Calculator::Calculator(QWidget* pwgt/*= 0*/) : QWidget(pwgt)
{
m_plcd = new QLCDNumber(12);
m_plcd->setSegmentStyle(QLCDNumber::Flat);
m_plcd->setMinimumSize(150, 50);
QChar aButtons[4][4] = {{'7', '8', '9', '/'},
{'4', '5', '6', '*'},
{'1', '2', '3', '-'},
{'0', '.', '=', '+'}
};
//Layout setup
QGridLayout* ptopLayout = new QGridLayout;
ptopLayout->addWidget(m_plcd, 0, 0, 1, 4);
ptopLayout->addWidget(createButton("CE"), 1, 3);
for (int i = 0; i < 4; ++i) {
for (int j = 0; j < 4; ++j) {
ptopLayout->addWidget(createButton(aButtons[i][j]), i + 2, j);
}
}
setLayout(ptopLayout);
}
// ----------------------------------------------------------------------
QPushButton* Calculator::createButton(const QString& str)
{
QPushButton* pcmd = new QPushButton(str);
pcmd->setMinimumSize(40, 40);
connect(pcmd, SIGNAL(clicked()), SLOT(slotButtonClicked()));
return pcmd;
}
// ----------------------------------------------------------------------
void Calculator::calculate()
{
double dOperand2 = m_stk.pop().toDouble();
QString strOperation = m_stk.pop();
double dOperand1 = m_stk.pop().toDouble();
double dResult = 0;
if (strOperation == "+") {
dResult = dOperand1 + dOperand2;
}
if (strOperation == "-") {
dResult = dOperand1 - dOperand2;
}
if (strOperation == "/") {
dResult = dOperand1 / dOperand2;
}
if (strOperation == "*") {
dResult = dOperand1 * dOperand2;
}
m_plcd->display(dResult);
}
// ----------------------------------------------------------------------
void Calculator::slotButtonClicked()
{
QString str = ((QPushButton*)sender())->text();
if (str == "CE") {
m_stk.clear();
m_plcd->display("0");
return;
}
if (str.contains(QRegExp("[0-9]"))) {
str = QString().setNum(m_plcd->value()) + str;
m_plcd->display(str.toDouble());
}
else {
if (m_stk.count() >= 2) {
m_stk.push(QString().setNum(m_plcd->value()));
calculate();
m_stk.clear();
m_stk.push(QString().setNum(m_plcd->value()));
if (str != "=") {
m_stk.push(str);
}
}
else {
m_stk.push(QString().setNum(m_plcd->value()));
m_stk.push(str);
m_plcd->display(0);
}
}
}
|
main.cpp
| Код |
#include <QApplication>
#include "Calculator.h"
// ----------------------------------------------------------------------
int main(int argc, char** argv)
{
QApplication app(argc, argv);
Calculator calculator;
calculator.setWindowTitle("Calculator");
calculator.resize(230, 200);
calculator.show();
return app.exec();
}
|
Собирай qmake -project; qmake; make
У меня в SUSE11.1 все работает. |
