Many Qt Quick QML types are implemented in Qt Quick Ultralite. The API reference covers the available API. If some part of the API is not listed, Qt Quick Ultralite does not currently implement it.

This topic lists particular API differences beyond unimplemented API.

See also Known Issues or Limitations.

Item QML type

Item::parent is read-only. The parent of an Item cannot be changed in states or script expressions.

The anchors of an Item cannot be changed in script expressions.

The state, states, and transitions properties are only available for the root item of a QML file.

Image QML type

Qt Quick Ultralite implements the transform property on Image. In Qt Quick, this property is part of the Item type.

ListView QML type

The current implementation of ListView assumes that all delegates have the same size. It is a known bug that you need to provide size for the delegate explicitly.

Text QML type

Qt Quick Ultralite implements two additional Text properties: baselineOffset and transform. In Qt Quick, these properties are part of the Item type.

Qt Quick Ultralite also implements a StaticText type to optimize text display when the text is known at compile-time.

font basic type

The font basic type has the additional font.unicodeCoverage property.

Rectangle QML type

The Rectangle type does not support transform or rotation properties. In Qt Quick, these properties are a part of the Item type.

Availability of transform properties

The scale, rotation, and transformOrigin properties on the Image, Text, and StaticText types are generated conditionally. These properties are only available if a binding to them exists.

Image {
    id: img
    source: "logo.png"

    Component.onCompleted: img.scale = 1.5 // error!

    // If this binding is present, the scale property will be available.
    // scale: 1
}