Qt 5.9 | Qt Quick Extras | QML Types | CircularGauge QML Type

Qt 5.9.2 Reference Documentation

# CircularGauge QML Type

A gauge that displays a value within a range along an arc. More...

Import Statement: | import QtQuick.Extras 1.4
Since: | Qt 5.5

- List of all members, including inherited members

## Properties

- maximumValue : real
- minimumValue : real
- stepSize : real
- tickmarksVisible : bool
- value : alias

## Detailed Description

The CircularGauge is similar to traditional mechanical gauges that use a needle to display a value from some input, such as the speed of a vehicle or air pressure, for example.

The minimum and maximum values displayable by the gauge can be set with the minimumValue and maximumValue properties. The angle at which these values are displayed can be set with the minimumValueAngle and maximumValueAngle properties of CircularGaugeStyle.

Example:

      CircularGauge {
          value: accelerating ? maximumValue : 0
          anchors.centerIn: parent

          property bool accelerating: false

          Keys.onSpacePressed: accelerating = true
          Keys.onReleased: {
              if (event.key === Qt.Key_Space) {
                  accelerating = false;
                  event.accepted = true;
              }
          }

          Component.onCompleted: forceActiveFocus()

          Behavior on value {
              NumberAnimation {
                  duration: 1000
              }
          }
      }

You can create a custom appearance for a CircularGauge by assigning a CircularGaugeStyle.

## Property Documentation

maximumValue : real

This property holds the largest value displayed by the gauge.

minimumValue : real

This property holds the smallest value displayed by the gauge.

stepSize : real

This property holds the size of the value increments that the needle displays.

For example, when stepSize is `10` and value is `0`, adding `5` to value will have no visible effect on the needle, although value will still be incremented. Adding an extra `5` to value will then cause the needle to point to `10`.

tickmarksVisible : bool

This property determines whether or not the gauge displays tickmarks, minor tickmarks, and labels.

For more fine-grained control over what is displayed, the following style components of CircularGaugeStyle can be used:

- tickmark
- minorTickmark
- tickmarkLabel

value : alias

This property holds the current value displayed by the gauge, which will always be between minimumValue and maximumValue, inclusive.