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QML

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Description #

QML (Qt Modeling Language) is a declarative language designed for building highly dynamic, fluid, and visually appealing user interfaces. It is mainly used with the Qt framework to create cross-platform applications for desktop and embedded systems.

History #

QML was introduced by Nokia in 2009 as part of the Qt Quick framework. It was created to simplify UI development by combining JavaScript with a JSON-like syntax, making it easier to describe UI components and their behaviors declaratively.

Hello World Code #

import QtQuick 2.0

Rectangle {
    width: 200
    height: 100
    color: "lightblue"

    Text {
        text: "Hello, World!"
        anchors.centerIn: parent
    }
}

How to Run #

Option 1: Online
Try QML code online at QML Online Editor.

Option 2: Local

qmlscene HelloWorld.qml

Key Concepts #

  • Declarative syntax for UI design
  • Integrates JavaScript for logic and bindings
  • Supports dynamic property bindings and animations
  • Cross-platform support (Windows, macOS, Linux, embedded)
  • Uses Qt Quick framework for building modern UIs
  • Components and states management for responsive designs
  • Lightweight and optimized for performance
  • Extensible with C++ for backend logic
  • Supports touch and gesture input
  • Large community around Qt and QML

Try It Online #

QML Web Live Editor

Fun Facts #

  • QML’s declarative style lets designers and developers work more collaboratively.
  • The language was inspired by JSON and JavaScript, making it easy for web developers to learn.
  • QML is widely used in automotive infotainment systems and embedded devices.
  • The Qt framework powers applications like KDE desktop and Autodesk Maya.
  • QML supports state transitions and animations declaratively, reducing the need for imperative code.

Resources #

Updated on June 9, 2025

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