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Implementing of fading animation with QML

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This code snippet shows how to implement a fading animation with QML.

Article Metadata
Tested with
Devices(s): Nokia 900
Compatibility
Platform(s): S60 5th Edition
Maemo
Symbian
S60 5th Edition
Article
Keywords: QML, PropertyAnimation
Created: kratsan (18 Jun 2010)
Last edited: hamishwillee (18 Oct 2012)

Contents

Overview

In the following QML code there are four ways to implement the fading of a Rectangle element using PropertyAnimation when the rectangles are clicked. Different implementations suit different purposes, so use the most suitable one.

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: 640; height: 480
color: "black"
 
Row {
anchors.centerIn: parent; spacing: 10
 
// Implements fading using Behavior
Rectangle {
id: fadingByBehavior
 
width: 100; height: 100; color: "red"
Behavior on opacity { PropertyAnimation { duration: 1000 } }
 
MouseArea { anchors.fill: parent; onClicked: fadingByBehavior.opacity = 0.2 }
}
 
 
// Implements fading using States and Transitions
Rectangle {
id: fadingByState
 
width: 100; height: 100; color: "green"
 
MouseArea { anchors.fill: parent; onClicked: fadingByState.state = "hidden" }
 
states: State { name: "hidden"; PropertyChanges { target: fadingByState; opacity: 0.2 } }
 
transitions: Transition {
from: "*"
to: "hidden"
PropertyAnimation { target: fadingByState; property: "opacity"; duration: 1000 }
}
}
 
 
// Implements fading using animation as an element
Rectangle {
id: fadingByAnimationElement
 
width: 100; height: 100; color: "blue"
 
MouseArea { anchors.fill: parent; onClicked: hideAnimation.start() }
 
PropertyAnimation {
id: hideAnimation
target: fadingByAnimationElement; property: "opacity"; to: 0.2; duration: 1000
}
}
 
 
// Implements fading directly from the event handler
Rectangle {
id: fadingFromSignalHandler
 
width: 100; height: 100; color: "yellow"
 
MouseArea {
anchors.fill: parent
onClicked: PropertyAnimation {
target: fadingFromSignalHandler; property: "opacity"; to: 0.2; duration: 1000
}
}
}
}
}

Postconditions

The code snippet demonstrated four different ways to implement a fading animation with PropertyAnimation.

This page was last modified on 18 October 2012, at 01:07.
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