2-3-5

SoftwareDesign/Code/2-3-5/lab2-3-5_KeyEvent/lab2-3-5_KeyEvent.pro

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+QT       += core gui
+
+greaterThan(QT_MAJOR_VERSION, 4): QT += widgets
+
+CONFIG += c++17
+
+# You can make your code fail to compile if it uses deprecated APIs.
+# In order to do so, uncomment the following line.
+#DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000    # disables all the APIs deprecated before Qt 6.0.0
+
+SOURCES += \
+    main.cpp \
+    mainwindow.cpp
+
+HEADERS += \
+    mainwindow.h
+
+FORMS += \
+    mainwindow.ui
+
+# Default rules for deployment.
+qnx: target.path = /tmp/$${TARGET}/bin
+else: unix:!android: target.path = /opt/$${TARGET}/bin
+!isEmpty(target.path): INSTALLS += target

SoftwareDesign/Code/2-3-5/lab2-3-5_KeyEvent/main.cpp

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+#include "mainwindow.h"
+
+#include <QApplication>
+
+int main(int argc, char *argv[])
+{
+    QApplication a(argc, argv);
+    MainWindow w;
+    w.show();
+    return a.exec();
+}

SoftwareDesign/Code/2-3-5/lab2-3-5_KeyEvent/mainwindow.cpp

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+#include "mainwindow.h"
+#include "ui_mainwindow.h"
+
+MainWindow::MainWindow(QWidget *parent)
+    : QMainWindow(parent), ui(new Ui::MainWindow) {
+  ui->setupUi(this);
+}
+
+MainWindow::~MainWindow() { delete ui; }
+
+void MainWindow::keyPressEvent(QKeyEvent *event) {
+  if (event->key() == Qt::Key_Up) {
+    ui->l->move(ui->l->pos().x(), ui->l->pos().y() - 20);
+  } else if (event->key() == Qt::Key_Down) {
+    ui->l->move(ui->l->pos().x(), ui->l->pos().y() + 20);
+  } else if (event->key() == Qt::Key_Left) {
+    ui->l->move(ui->l->pos().x() - 20, ui->l->pos().y());
+  } else if (event->key() == Qt::Key_Right) {
+    ui->l->move(ui->l->pos().x() + 20, ui->l->pos().y());
+  }
+}
+void MainWindow::keyReleaseEvent(QKeyEvent *e) {
+  if (e->key() == Qt::Key_Up) {
+    ui->l->move(ui->l->pos().x(), ui->l->pos().y() - 20);
+  } else if (e->key() == Qt::Key_Down) {
+    ui->l->move(ui->l->pos().x(), ui->l->pos().y() + 20);
+  } else if (e->key() == Qt::Key_Left) {
+    ui->l->move(ui->l->pos().x() - 20, ui->l->pos().y());
+  } else if (e->key() == Qt::Key_Right) {
+    ui->l->move(ui->l->pos().x() + 20, ui->l->pos().y());
+  }
+}

SoftwareDesign/Code/2-3-5/lab2-3-5_KeyEvent/mainwindow.h

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+#ifndef MAINWINDOW_H
+#define MAINWINDOW_H
+
+#include <QKeyEvent>
+#include <QMainWindow>
+QT_BEGIN_NAMESPACE
+namespace Ui {
+class MainWindow;
+}
+QT_END_NAMESPACE
+
+class MainWindow : public QMainWindow {
+  Q_OBJECT
+
+public:
+  MainWindow(QWidget *parent = nullptr);
+  ~MainWindow();
+
+private:
+  Ui::MainWindow *ui;
+  void keyPressEvent(QKeyEvent *e);
+  void keyReleaseEvent(QKeyEvent *e);
+};
+#endif // MAINWINDOW_H

SoftwareDesign/Code/2-3-5/lab2-3-5_KeyEvent/mainwindow.ui

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+<?xml version="1.0" encoding="UTF-8"?>
+<ui version="4.0">
+ <class>MainWindow</class>
+ <widget class="QMainWindow" name="MainWindow">
+  <property name="geometry">
+   <rect>
+    <x>0</x>
+    <y>0</y>
+    <width>800</width>
+    <height>600</height>
+   </rect>
+  </property>
+  <property name="windowTitle">
+   <string>MainWindow</string>
+  </property>
+  <widget class="QWidget" name="centralwidget">
+   <widget class="QLabel" name="l">
+    <property name="geometry">
+     <rect>
+      <x>240</x>
+      <y>200</y>
+      <width>77</width>
+      <height>25</height>
+     </rect>
+    </property>
+    <property name="text">
+     <string>TextLabel</string>
+    </property>
+   </widget>
+  </widget>
+  <widget class="QMenuBar" name="menubar">
+   <property name="geometry">
+    <rect>
+     <x>0</x>
+     <y>0</y>
+     <width>800</width>
+     <height>30</height>
+    </rect>
+   </property>
+  </widget>
+  <widget class="QStatusBar" name="statusbar"/>
+ </widget>
+ <resources/>
+ <connections/>
+</ui>