La descripción de Qt Quick Extras - Gallery

The Qt Quick Extras module provides a specialized set of controls that can be used to build interfaces in Qt Quick.
The module was introduced in Qt 5.5.
Controls are typically items that are used to present or receive input from the user.
CircularGauge
A gauge that displays a value within a range along an arc
DelayButton
A checkable button that triggers an action when held in long enough
Dial
A circular dial that is rotated to set a value
Gauge
A straight gauge that displays a value within a range
PieMenu
A popup menu that displays several menu items along an arc
StatusIndicator
An indicator that displays active or inactive states
ToggleButton
A push button that toggles between two states
Tumbler
A control that can have several spinnable wheels, each with items that can be selected
TumblerColumn
A column within a tumbler
Picture
An indicator that displays a colorized QPicture icon