qt-course/simple-calculator/MyWidget.cpp

   1 #include <QString>
   2 #include "MyWidget.h"
   3
   4 #define CONNECT_NUMBUTTON(button)                    \
   5         connect(button, SIGNAL(clicked(bool)), this, \
   6                 SLOT(slot_numButtonClicked()))
   7
   8 #define CONNECT_OPERBUTTON(button)                     \
   9         connect(button, SIGNAL(clicked(bool)), this,   \
  10                 SLOT(slot_operButtonClicked()))
  11
  12 #define DISABLE_BUTTON(button) button->setEnable(false)
  13 #define ENABLE_BUTTON(button)  button->setEnable(true)
  14
  15 MyWidget::MyWidget(QWidget *parent)
  16 : QWidget(parent)
  17 {
  18         m_ui = new Ui::MyWidgetBase();
  19         m_ui->setupUi(this);
  20
  21         CONNECT_NUMBUTTON(m_ui->m_button0);
  22         CONNECT_NUMBUTTON(m_ui->m_button1);
  23         CONNECT_NUMBUTTON(m_ui->m_button2);
  24         CONNECT_NUMBUTTON(m_ui->m_button3);
  25         CONNECT_NUMBUTTON(m_ui->m_button4);
  26         CONNECT_NUMBUTTON(m_ui->m_button5);
  27         CONNECT_NUMBUTTON(m_ui->m_button6);
  28         CONNECT_NUMBUTTON(m_ui->m_button7);
  29         CONNECT_NUMBUTTON(m_ui->m_button8);
  30         CONNECT_NUMBUTTON(m_ui->m_button9);
  31
  32         CONNECT_OPERBUTTON(m_ui->m_buttonSum);
  33         CONNECT_OPERBUTTON(m_ui->m_buttonMult);
  34         CONNECT_OPERBUTTON(m_ui->m_buttonSub);
  35         CONNECT_OPERBUTTON(m_ui->m_buttonDiv);
  36         CONNECT_OPERBUTTON(m_ui->m_buttonRes);
  37
  38         resetDisplay = true;
  39         buttonsEnabled(true);
  40 }
  41
  42 MyWidget::~MyWidget()
  43 {
  44 }
  45
  46 void MyWidget::slot_numButtonClicked()
  47 {
  48         QPushButton *btn = dynamic_cast<QPushButton *>(sender());
  49         if (!btn)
  50                 return;
  51
  52         QString text = m_ui->m_display->text();
  53         if (resetDisplay) {
  54                 text = "";
  55                 resetDisplay = false;
  56         }
  57
  58         text += btn->text();
  59         m_ui->m_display->setText(text);
  60 }
  61
  62 void MyWidget::buttonsEnabled(bool value)
  63 {
  64         m_ui->m_buttonSum->setEnabled(value);
  65         m_ui->m_buttonMult->setEnabled(value);
  66         m_ui->m_buttonSub->setEnabled(value);
  67         m_ui->m_buttonDiv->setEnabled(value);
  68         m_ui->m_buttonRes->setEnabled(!value);
  69 }
  70
  71 void MyWidget::slot_operButtonClicked()
  72 {
  73         int result;
  74         QPushButton *btn = dynamic_cast<QPushButton *>(sender());
  75         if (!btn)
  76                 return;
  77
  78         resetDisplay = true;
  79
  80         if (btn->text() == "=") {
  81                 int lvalue = m_ui->m_display->text().toInt();
  82                 if (m_oper == "+")
  83                         result = m_number + lvalue;
  84                 else if (m_oper == "-")
  85                         result = m_number - lvalue;
  86                 else if (m_oper == "*")
  87                         result = m_number * lvalue;
  88                 else // m_oper == "/"
  89                         result = m_number / lvalue;
  90                 m_ui->m_display->setText(QString::number(result));
  91                 buttonsEnabled(true);
  92         } else {
  93                 m_oper = btn->text();
  94                 m_number = m_ui->m_display->text().toInt();
  95                 buttonsEnabled(false);
  96         }
  97 }