The code creates a simple Qt application that displays a window with three buttons arranged horizontally using a QHBoxLayout. The application runs until the user closes the window, at which point the event loop ends and the application terminates.

Run example

npm run import -- "qt application"

qt application

#include <QApplication>
#include <QWidget>
#include <QPushButton>
#include <QHBoxLayout>

int main(int argc, char *argv[]) {
    QApplication app(argc, argv);

    QWidget window;
    window.setWindowTitle("Qt Layout Example");

    QPushButton *button1 = new QPushButton("Button 1");
    QPushButton *button2 = new QPushButton("Button 2");
    QPushButton *button3 = new QPushButton("Button 3");

    QHBoxLayout *layout = new QHBoxLayout;
    layout->addWidget(button1);
    layout->addWidget(button2);
    layout->addWidget(button3);

    window.setLayout(layout);
    window.show();

    return app.exec();
}

#include 
#include 
#include 
#include 

/**
 * @brief Main function responsible for creating and running the application.
 *
 * @param argc The number of command line arguments.
 * @param argv An array of command line arguments.
 *
 * @return The application's exit code.
 */
int main(int argc, char *argv[]) {
    // Create a new instance of QApplication
    QApplication app(argc, argv);

    // Create a new instance of QWidget to serve as the application window
    QWidget window;
    // Set the window title
    window.setWindowTitle("Qt Layout Example");

    // Create three instances of QPushButton
    QPushButton *button1 = new QPushButton("Button 1");
    QPushButton *button2 = new QPushButton("Button 2");
    QPushButton *button3 = new QPushButton("Button 3");

    // Create a new instance of QHBoxLayout to manage the button layout
    QHBoxLayout *layout = new QHBoxLayout;

    // Add the buttons to the layout in sequence
    layout->addWidget(button1);
    layout->addWidget(button2);
    layout->addWidget(button3);

    // Set the layout for the application window
    window.setLayout(layout);
    // Show the window on screen
    window.show();

    // Run the application's event loop
    return app.exec();
}

Overview

The provided code is a simple Qt application that creates a window with a horizontal layout containing three buttons.

Includes

• QApplication: The main application object that manages the event loop.
• QWidget: The base class for all user interface objects.
• QPushButton: A button widget that can be clicked by the user.
• QHBoxLayout: A layout manager that arranges widgets horizontally.

Main Function

Initialization

• The main function is the entry point of the application.
• QApplication is instantiated with the command line arguments argc and argv.

Creating UI Components

• A QWidget is created to serve as the main window.
• Three QPushButton instances are created with different labels.

Creating a Layout

• A QHBoxLayout is created to arrange the buttons horizontally.
• Each button is added to the layout using addWidget.

Setting Up the Window

• The layout is set to the main window using setLayout.
• The window is shown using show.

Running the Application

• The exec function is called on the QApplication instance to start the event loop.
• The application runs until the exec function returns, indicating the end of the event loop.