- Qt 6.8
- Qt Qml
- Qt Qml QML Types
- Qt 6.8.2 Reference Documentation

# Qt Qml QML Types

The Qt Qml module provides the definition and implementation of various convenience types that can be used with the QML language. This includes elementary QML types, which can provide the basis for further extensions to the QML language. The QtObject and Component object types are non-visual and provide building-blocks for extensions to QML.

## Importing QtQml

The types provided by the `QtQml` module are only available in a QML document if that document imports the `QtQml` namespace (or if the document imports the `QtQuick` namespace, as noted below).

To use the module, import the `QtQml` module with the following statement:

     import QtQml

Many clients will never need to use the `QtQml` module directly, but will rather import it indirectly via the `QtQuick` module as follows:

     import QtQuick

See the Qt Quick module documentation for more information about its types.

The QML types for creating lists and models, such as ListModel and ListElement, belong to a submodule, QtQml.Models.

The WorkerScript QML type belongs to the submodule QtQml.WorkerScript.

Both, QtQml.Models and QtQml.WorkerScript are automatically imported whenever you import `QtQml`. All their types are then available, too.

The Qt Quick module automatically imports `QtQml` and, transitively, QtQml.Models and QtQml.WorkerScript, making all their types available whenever you import `QtQuick`.

## Value Types

The following QML Value Types are provided:

point | Value with x and y attributes
rect | Value with x, y, width and height attributes
size | Value with width and height attributes

## Sequence Types

The following QML sequence types are provided by the Qt QML module in addition to the ones registered with each value type and object type:

- `std::vector<QString>`
- `std::vector<QUrl>`
- `std::vector<bool>`
- `std::vector<int>`
- `std::vector<float>`
- `std::vector<double>`

## Object Types

The following QML object types are provided:

Binding | Enables the arbitrary creation of property bindings
Component | Encapsulates a QML component definition
Connections | Describes generalized connections to signals
Date | Provides date functions
Locale | Provides locale specific properties and formatted data
LoggingCategory | Defines a logging category in QML
Number | Object provides represents a number value
Qt | Provides a global object with useful enums and functions from Qt
QtObject | A basic QML type
Timer | Triggers a handler at a specified interval
XMLHttpRequest | Object for sending requests to a server