qt-course/exer355-base-converter/MyWidget.cpp

   1 #include <QLabel>
   2 #include <QLineEdit>
   3 #include <QVBoxLayout>
   4 #include <QHBoxLayout>
   5
   6 #include "MyWidget.h"
   7
   8 MyWidget::MyWidget(QWidget *parent)
   9 : QWidget(parent)
  10 {
  11         QLabel *m_label;
  12
  13         /* The labels */
  14
  15         QVBoxLayout *labels = new QVBoxLayout();
  16
  17         m_label = new QLabel("Binario", this);
  18         labels->addWidget(m_label);
  19
  20         m_label = new QLabel("Octal", this);
  21         labels->addWidget(m_label);
  22
  23         m_label = new QLabel("Decimal", this);
  24         labels->addWidget(m_label);
  25
  26         m_label = new QLabel("Hexadecimal", this);
  27         labels->addWidget(m_label);
  28
  29         /* QlineEdits */
  30
  31         QVBoxLayout *lines = new QVBoxLayout();
  32         for (int i = 0; i < NR_LABELS; i++) {
  33                 m_qlines[i] = new QLineEdit(this);
  34                 lines->addWidget(m_qlines[i]);
  35                 connect(m_qlines[i], SIGNAL(textEdited(const QString &)),
  36                                 this, SLOT(m_update_lines()));
  37         }
  38
  39         /* Put them together */
  40         QHBoxLayout *main_layout = new QHBoxLayout(this);
  41         main_layout->addItem(labels);
  42         main_layout->addItem(lines);
  43 }
  44
  45 MyWidget::~MyWidget()
  46 {
  47 }
  48
  49 void MyWidget::resetLines()
  50 {
  51         for (int i = 0; i < NR_LABELS; i++)
  52                 m_qlines[i]->setText("");
  53 }
  54
  55 void MyWidget::m_update_lines()
  56 {
  57         int base, i;
  58
  59         for (i = 0; i < NR_LABELS; i++) {
  60                 if (m_qlines[i]->isModified()) {
  61                         if (m_qlines[i]->text() == "") {
  62                                 resetLines();
  63                                 return;
  64                         }
  65
  66                         switch (i) {
  67                         case 0:
  68                                 base = 2;
  69                                 break;
  70                         case 1:
  71                                 base = 8;
  72                                 break;
  73                         case 2:
  74                                 base = 10;
  75                                 break;
  76                         case 3:
  77                                 base = 16;
  78                                 break;
  79                         }
  80                         break;
  81                 }
  82         }
  83
  84         int num = m_qlines[i]->text().toInt(0, base);
  85         m_qlines[0]->setText(QString::number(num, 2));
  86         m_qlines[1]->setText(QString::number(num, 8));
  87         m_qlines[2]->setText(QString::number(num, 10));
  88         m_qlines[3]->setText(QString::number(num, 16).toUpper());
  89 }