Using QML Flow to place QML elements

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This code snippet shows how to use the QML element Flow to position child elements.

Article Metadata

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Tested with

Devices(s): Nokia 900

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Compatibility

Platform(s): S60 5th Edition
Maemo, Qt 4.7

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Article

Keywords: QML, Flow

Created: kratsan (24 Jun 2010)

Last edited: hamishwillee (17 Oct 2012)

Overview

Flow arranges its children side by side, wrapping as necessary. The following snippet places approximately 100 tiny rectangles inside the positioner. After this, the never-ending animation will adjust the width of Flow to make it continuously arrange its children.

The code snippet is meant to be run with qmlviewer.

Preconditions

• Qt 4.7 or higher is installed on your platform.

Source

ui.qml

import Qt 4.7
 
Rectangle {
    width: 800; height: 480
    color: "black"
 
    Component.onCompleted: animation.start()
 
    Flow {
        id: flow
 
        property real originalWidth: 790
 
        x: 5; y: 5
        width: originalWidth
        spacing: 10
 
        Repeater {
            id: repeater
            model: 104
 
            Rectangle {
                width: 20; height: 20
                color: { var c = index / repeater.count; return Qt.rgba(1-c, c, c, 1) }
            }
        }
    }
 
    SequentialAnimation {
        id: animation
        loops: Animation.Infinite
 
        PropertyAnimation { target: flow; property: "width"; to: 200; duration: 1000 }
        PropertyAnimation { target: flow; property: "width"; to: flow.originalWidth; duration: 1000 }
    }
}

Postconditions

The Flow QML element is demonstrated by inserting a large amount of rectangles inside it and changing the width of Flow to make the rectangle positions rearrange continuously.