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• ScrollIndicator QML Type

ScrollIndicator

Vertical or horizontal non-interactive scroll indicator. More...

• List of all members, including inherited members

Properties

• active : bool
• horizontal : bool
• minimumSize : real
• orientation : enumeration
• position : real
• size : real
• vertical : bool
• visualPosition : real
• visualSize : real

Attached Properties

• horizontal : ScrollIndicator
• vertical : ScrollIndicator

Detailed Description

ScrollIndicator is a non-interactive indicator that indicates the current scroll position. A scroll indicator can be either vertical or horizontal, and can be attached to any Flickable, such as ListView and GridView.

Flickable {
    // ...
    ScrollIndicator.vertical: ScrollIndicator { }
}

Attaching ScrollIndicator to a Flickable

Note: When ScrollIndicator is attached vertically or horizontally to a Flickable, its geometry and the following properties are automatically set and updated as appropriate:

• orientation
• position
• size
• active

An attached ScrollIndicator re-parents itself to the target Flickable. A vertically attached ScrollIndicator resizes itself to the height of the Flickable, and positions itself to either side of it based on the layout direction. A horizontally attached ScrollIndicator resizes itself to the width of the Flickable, and positions itself to the bottom. The automatic geometry management can be disabled by specifying another parent for the attached ScrollIndicator. This can be useful, for example, if the ScrollIndicator should be placed outside a clipping Flickable. This is demonstrated by the following example:

Flickable {
    id: flickable
    clip: true
    // ...
    ScrollIndicator.vertical: ScrollIndicator {
        parent: flickable.parent
        anchors.top: flickable.top
        anchors.left: flickable.right
        anchors.bottom: flickable.bottom
    }
}

Binding the Active State of Horizontal and Vertical Scroll Indicators

Horizontal and vertical scroll indicators do not share the active state with each other by default. In order to keep both indicators visible whilst scrolling to either direction, establish a two-way binding between the active states as presented by the following example:

Flickable {
    anchors.fill: parent

    contentWidth: parent.width * 2
    contentHeight: parent.height * 2

    ScrollIndicator.horizontal: ScrollIndicator { id: hbar; active: vbar.active }
    ScrollIndicator.vertical: ScrollIndicator { id: vbar; active: hbar.active }
}

Non-attached Scroll Indicators

It is possible to create an instance of ScrollIndicator without using the attached property API. This is useful when the behavior of the attached scoll indicator is not sufficient or a Flickable is not in use. In the following example, horizontal and vertical scroll indicators are used to indicate how far the user has scrolled over the text (using MouseArea instead of Flickable):

Rectangle {
    id: frame
    clip: true
    width: 160
    height: 160
    border.color: "black"
    anchors.centerIn: parent

    Text {
        id: content
        text: "ABC"
        font.pixelSize: 169

        MouseArea {
            id: mouseArea
            drag.target: content
            drag.minimumX: frame.width - width
            drag.minimumY: frame.height - height
            drag.maximumX: 0
            drag.maximumY: 0
            anchors.fill: content
        }
    }

    ScrollIndicator {
        id: verticalIndicator
        active: mouseArea.pressed
        orientation: Qt.Vertical
        size: frame.height / content.height
        position: -content.y / content.height
        anchors { top: parent.top; right: parent.right; bottom: parent.bottom }
    }

    ScrollIndicator {
        id: horizontalIndicator
        active: mouseArea.pressed
        orientation: Qt.Horizontal
        size: frame.width / content.width
        position: -content.x / content.width
        anchors { left: parent.left; right: parent.right; bottom: parent.bottom }
    }
}

See also ScrollBar, Customizing ScrollIndicator, and Indicator Controls.

Property Documentation

Attached Property Documentation

Flickable {
    contentWidth: 2000
    ScrollIndicator.horizontal: ScrollIndicator { }
}

Flickable {
    contentHeight: 2000
    ScrollIndicator.vertical: ScrollIndicator { }
}