Qt

Qt is a cross-platform application and UI framework.

`qmake`

The build system tool of the Qt framework is qmake. It uses .pro files as configuration files. These contain settings for building Qt applications, such as source/header files, libraries, and required modules. They also specify target platform, compiler options, and resource files. Qmake uses this information to generate project files (such as a Makefile).

QML

The Qt Modeling Language (QML) is a declarative programming language for building UIs in Qt applications. In QML, the structure and behavior of the UI is defined using a JSON-like syntax. It can be used with JavaScript for more interactivity.

QML Code Example: Show "Hello World" on button press

import QtQuick 2.15
import QtQuick.Controls 2.15

ApplicationWindow {
    visible: true
    width: 400
    height: 200
    title: "Hello World Example"

    // A property to control the visibility of the text
    property bool showText: false

    Column {
        anchors.centerIn: parent
        spacing: 20

        Button {
            text: "Press me"
            onClicked: {
                showText = true  // Set the property to true when the button is clicked
            }
        }

        Text {
            text: "Hello, World!"
            visible: showText  // Show the text only if showText is true
            font.pointSize: 24
        }
    }
}

#include <QGuiApplication>
#include <QQmlApplicationEngine>

int main(int argc, char *argv[]) {
    QGuiApplication app(argc, argv);
    QQmlApplicationEngine engine;
    engine.load(QUrl(QStringLiteral("qrc:/main.qml")));

    return app.exec();
}