- Qt 5.3
- Qt Quick
- Qt Quick Examples - Animation
- property-animation.qml Example File
- Qt 5.3.2 Reference Documentation

# property-animation.qml Example File

animation/basics/property-animation.qml

    /****************************************************************************
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    ** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
    ** Contact: http://www.qt-project.org/legal
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    ** This file is part of the examples of the Qt Toolkit.
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    ** $QT_BEGIN_LICENSE:BSD$
    ** You may use this file under the terms of the BSD license as follows:
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    import QtQuick 2.0

    Item {
        id: window
        width: 320; height: 480

        // Let's draw the sky...
        Rectangle {
            anchors { left: parent.left; top: parent.top; right: parent.right; bottom: parent.verticalCenter }
            gradient: Gradient {
                GradientStop { position: 0.0; color: "DeepSkyBlue" }
                GradientStop { position: 1.0; color: "LightSkyBlue" }
            }
        }

        // ...and the ground.
        Rectangle {
            anchors { left: parent.left; top: parent.verticalCenter; right: parent.right; bottom: parent.bottom }
            gradient: Gradient {
                GradientStop { position: 0.0; color: "ForestGreen" }
                GradientStop { position: 1.0; color: "DarkGreen" }
            }
        }

        // The shadow for the smiley face
        Image {
            anchors.horizontalCenter: parent.horizontalCenter
            y: smiley.minHeight + 58
            source: "images/shadow.png"

            // The scale property depends on the y position of the smiley face.
            scale: smiley.y * 0.5 / (smiley.minHeight - smiley.maxHeight)
        }

        Image {
            id: smiley
            property int maxHeight: window.height / 3
            property int minHeight: 2 * window.height / 3

            anchors.horizontalCenter: parent.horizontalCenter
            y: minHeight
            source: "images/face-smile.png"

            // Animate the y property. Setting loops to Animation.Infinite makes the
            // animation repeat indefinitely, otherwise it would only run once.
            SequentialAnimation on y {
                loops: Animation.Infinite

                // Move from minHeight to maxHeight in 300ms, using the OutExpo easing function
                NumberAnimation {
                    from: smiley.minHeight; to: smiley.maxHeight
                    easing.type: Easing.OutExpo; duration: 300
                }

                // Then move back to minHeight in 1 second, using the OutBounce easing function
                NumberAnimation {
                    from: smiley.maxHeight; to: smiley.minHeight
                    easing.type: Easing.OutBounce; duration: 1000
                }

                // Then pause for 500ms
                PauseAnimation { duration: 500 }
            }
        }
    }