qt-course/exer361-key-press/MyWidget.cpp

   1 #include <QLabel>
   2 #include <QString>
   3 #include <QKeyEvent>
   4 #include <QPushButton>
   5 #include <QVBoxLayout>
   6
   7 #include "MyWidget.h"
   8
   9 MyWidget::MyWidget(QWidget *parent)
  10 : QWidget(parent)
  11 {
  12         m_label = new QLabel("Hello, World!", this);
  13         m_button = new QPushButton("Press me", this);
  14
  15         QVBoxLayout *layout = new QVBoxLayout(this);
  16         layout->addWidget(m_label);
  17         layout->addWidget(m_button);
  18
  19         saved = false;
  20 }
  21
  22 MyWidget::~MyWidget()
  23 {
  24 }
  25
  26 void MyWidget::keyPressEvent(QKeyEvent *event)
  27 {
  28         int y, x;
  29         const int incr_size = 4;
  30
  31         y = this->size().width();
  32         x = this->size().height();
  33
  34         if (!saved) {
  35                 original_x = x;
  36                 original_y = y;
  37                 saved = true;
  38         }
  39
  40         if (event->key() == Qt::Key_H)
  41                 y += incr_size;
  42         if (event->key() == Qt::Key_V)
  43                 x += incr_size;
  44         if (event->key() == Qt::Key_T) {
  45                 x += incr_size;
  46                 y += incr_size;
  47         }
  48         if (event->key() == Qt::Key_R) {
  49                 x = original_x;
  50                 y = original_y;
  51         }
  52
  53         this->resize(y, x);
  54 }