QML Progress Spinner

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Progress Spinner

This snippet article shows how to make a nice little progress bar/activity spinner in QML. In builds upon the "Busy Indicator":http://developer.qt.nokia.com/wiki/Busy_Indicator_for_QML and "Simple Progress Bar":http://developer.qt.nokia.com/wiki/Simple_QML_Progress_Bar components and adds some nice little animations.

This Progress Spinner component is very easy to embed into your new and existing QML components. This is what it looks like (without the animations of course):

Progress Spinner

Implementation

<br />import QtQuick 1.0<br />import ZapBsComponents 1.0

Item {<br /> id: progressSpinner<br /> property alias minimum: progress.minimum<br /> property alias maximum: progress.maximum<br /> property alias value: progress.value<br /> property alias progressWidth: progress.width<br /> property alias progressHeight: progress.height<br /> property color color: &quot;#77B753&amp;quot;

BusyIndicator {<br /> id: busyIndicator<br /> anchors.fill: parent<br /> foregroundColor: progressSpinner.color<br /> opacity: ( value == maximum ) ? 0.0 : 1.0<br /> Behavior on opacity {<br /> NumberAnimation {<br /> duration: 100<br /> }<br /> }

RotationAnimation<br /> {<br /> target: busyIndicator<br /> property: &quot;rotation&amp;quot; // Suppress a warning<br /> from: 0<br /> to: 360<br /> direction: RotationAnimation.Clockwise<br /> duration: 1000<br /> loops: Animation.Infinite<br /> running: progress.value &lt; progress.maximum<br /> }<br /> }

SimpleProgressBar {<br /> id: progress<br /> anchors.centerIn: progressSpinner<br /> width: 2 * busyIndicator.actualInnerRadius - 12<br /> height: 12<br /> color: progressSpinner.color<br /> opacity: ( value  minimum || value  maximum ) ? 0.0 : 1.0<br /> Behavior on opacity {<br /> NumberAnimation {<br /> duration: 300<br /> }<br /> }

value: 35<br /> }<br />}<br />

Usage

This little snippet demonstrates the fade in/out animations of the ProgressSpinner.—


import QtQuick 1.0

Rectangle {
id: root
width: 640
height: 360

ProgressSpinner {
id: progress
x: 10
y: 10
width: 100
height: 100

SequentialAnimation on value {
PauseAnimation { duration: 500 }
NumberAnimation { duration: 1500; from: 0; to: 100; }
PauseAnimation { duration: 500 }
loops: Animation.Infinite
}
}
}