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  • Progress bar
  • Busy indicator
  1. KDE Developer Platform
  2. Getting started
  3. Kirigami

Progress bars and indicators

Provide your users with loading state information using progress bars.

PreviousAction toolbarsNextList views

Last updated 8 months ago

Whenever your application does something that takes a noticeable amount of time, you will want to use a visual element that tells the user that something is happening in the background.

QtQuick Controls provides two useful components that you can use to this end.

Progress bar

is a component that lets you easily include progress bars in your application. There are four main properties you will need to use:

  • : the minimum value represented by the start of the progress bar

  • : the maximum value represented by the end of the progress bar

  • : the current value of the action that is in progress (e.g. 50% loaded)

  • : if the action that is in process currently has no clear progress value, you can set this property to true to show the user that something is happening but its progress is not yet clear (but will be soon).

import QtQuick
import QtQuick.Layouts
import QtQuick.Controls as Controls
import org.kde.kirigami as Kirigami

Kirigami.ApplicationWindow {
    title: "Progressbar App"
    width: 400
    height: 400
    pageStack.initialPage: Kirigami.Page {
        ColumnLayout {
            anchors.left: parent.left
            anchors.right: parent.right
            Controls.ProgressBar {
                Layout.fillWidth: true
                from: 0
                to: 100
                value: 50
                indeterminate: false
            }
            Controls.ProgressBar {
                Layout.fillWidth: true
                from: 0
                to: 100
                // value: 50
                indeterminate: true
            }
        }
    }
}

Busy indicator

import QtQuick
import QtQuick.Controls as Controls
import org.kde.kirigami as Kirigami

Kirigami.ApplicationWindow {
    title: "Progressbar App"
    width: 400
    height: 400
    pageStack.initialPage: Kirigami.Page {
        actions: [
            Kirigami.Action {
                text: "Toggle busy indicator"
                onTriggered: indicator.running ? indicator.running = false : indicator.running = true
            }
        ]
        Controls.BusyIndicator {
            id: indicator
            anchors.centerIn: parent
        }
    }
}

In cases where loading times are shorter or measuring progress is not feasible, you can instead use . This component provides a simple spinning wheel that shows users that something is happening.

If you want the indicator to stop running, you can do so by setting the property to false, in which case the .

Controls.ProgressBar
from
to
value
indeterminate
Controls.BusyIndicator
running
Above: progress bar at 50%; below: indeterminate progress bar