Qt Documentation

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Tumbler QML Type

A spinnable wheel of items that can be selected. More...

Import Statement: import QtQuick.Controls 2.0
Since: Qt 5.7
Inherits:

Control

Properties

Attached Properties

Detailed Description

Tumbler {
    model: 5
    // ...
}

Non-wrapping Tumbler

The default contentItem of Tumbler is a PathView, which wraps when it reaches the top and bottom. To achieve a non-wrapping Tumbler, use ListView as the contentItem:

Tumbler {
    id: listViewTumbler

    contentItem: ListView {
        anchors.fill: parent
        model: listViewTumbler.model
        delegate: listViewTumbler.delegate

        snapMode: ListView.SnapToItem
        highlightRangeMode: ListView.StrictlyEnforceRange
        preferredHighlightBegin: height / 2 - (height / listViewTumbler.visibleItemCount / 2)
        preferredHighlightEnd: height / 2  + (height / listViewTumbler.visibleItemCount / 2)
        clip: true
    }
}

See also Customizing Tumbler and Input Controls.

Property Documentation

[read-only] count : int

This property holds the number of items in the model.


currentIndex : int

This property holds the index of the current item.


[read-only] currentItem : Item

This property holds the item at the current index.


delegate : component

This property holds the delegate used to display each item.


model : variant

This property holds the model that provides data for this tumbler.


visibleItemCount : int

This property holds the number of items visible in the tumbler. It must be an odd number, as the current item is always vertically centered.


Attached Property Documentation

[read-only] Tumbler.displacement : real

This attached property holds a value from -visibleItemCount / 2 to visibleItemCount / 2, which represents how far away this item is from being the current item, with 0 being completely current.

For example, the item below will be 40% opaque when it is not the current item, and transition to 100% opacity when it becomes the current item:

delegate: Text {
    text: modelData
    opacity: 0.4 + Math.max(0, 1 - Math.abs(Tumbler.displacement)) * 0.6
}

[read-only] Tumbler.tumbler : Tumbler

This attached property holds the tumbler. The property can be attached to a tumbler delegate. The value is null if the item is not a tumbler delegate.


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