[example] 9x9 table

Author: archibate

.gitignore

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+build/

CMakeLists.txt

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+cmake_minimum_required(VERSION 3.12)
+
+set(CMAKE_CXX_STANDARD 17)
+set(CMAKE_AUTOMOC ON)
+set(CMAKE_AUTORCC ON)
+set(CMAKE_AUTOUIC ON)
+
+project(qtguide)
+
+find_package(Qt5 REQUIRED COMPONENTS Core Widgets REQUIRED)
+
+file(GLOB sources *.cpp)
+add_executable(qtguide ${sources})
+target_link_libraries(qtguide PRIVATE Qt5::Core Qt5::Widgets)

main.cpp

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+#include <QApplication>
+#include <QMainWindow>
+#include <QDebug>
+#include <QGridLayout>
+#include <QLabel>
+
+// QObject -> QWidget -> QLabel, QMainWindow, QPushButton, QComboBox, ...
+
+class Label : public QLabel
+{
+public:
+    explicit Label(QWidget *parent = nullptr)
+        : QLabel(parent)
+    {
+        setAlignment(Qt::AlignCenter);
+        setStyleSheet(R"(
+                      QLabel {
+                      margin: 20px;
+                      font-size: 40px;
+                      }
+                      )");
+    }
+};
+
+class MainWindow : public QMainWindow
+{
+public:
+    explicit MainWindow(QWidget *parent = nullptr)
+        : QMainWindow(parent)
+    {
+        setWindowTitle("宝宝乘法表");
+
+        setCentralWidget(new QWidget);
+        QGridLayout *layout = new QGridLayout;
+        centralWidget()->setLayout(layout);
+
+        for (int i = 1; i <= 9; ++i) {
+            for (int j = 1; j <= 9; ++j) {
+                Label *label = new Label;
+                label->setText(QString("%1*%2=%3").arg(i).arg(j).arg(i * j));
+                layout->addWidget(label, i - 1, j - 1);
+            }
+        }
+    }
+
+};
+
+int main(int argc, char **argv)
+{
+    QApplication app(argc, argv);
+    MainWindow win;
+    win.show();
+    return app.exec();
+}