Les animations

Item {
    id: container
    width: 320
    height: 120

    Rectangle {
        id: rect
        color: "red"
        width: 120
        height: 120

        TapHandler {
            onTapped: container.state === '' ? container.state = 'other' : container.state = ''
        }
    }
    states: [
        // This adds a second state to the container where the rectangle is farther to the right

        State { name: "other"

            PropertyChanges {
                target: rect
                x: 200
            }
        }
    ]
    transitions: [
        // This adds a transition that defaults to applying to all state changes

        Transition {

            // This applies a default NumberAnimation to any changes a state change makes to x or y properties
            NumberAnimation { properties: "x,y" }
        }
    ]
}

Item {
    width: 320
    height: 120

    Rectangle {
        color: "green"
        width: 120
        height: 120

        // This is the behavior, and it applies a NumberAnimation to any attempt to set the x property
        Behavior on x {

            NumberAnimation {
                //This specifies how long the animation takes
                duration: 600
                //This selects an easing curve to interpolate with, the default is Easing.Linear
                easing.type: Easing.OutBounce
            }
        }

        TapHandler {
            onTapped: parent.x == 0 ? parent.x = 200 : parent.x = 0
        }
    }
}

Item {
    width: 320
    height: 120

    Rectangle {
        color: "blue"
        width: 120
        height: 120

        // By setting this SequentialAnimation on x, it and animations within it will automatically animate
        // the x property of this element
        SequentialAnimation on x {
            id: xAnim
            // Animations on properties start running by default
            running: false
            loops: Animation.Infinite // The animation is set to loop indefinitely
            NumberAnimation { from: 0; to: 200; duration: 500; easing.type: Easing.InOutQuad }
            NumberAnimation { from: 200; to: 0; duration: 500; easing.type: Easing.InOutQuad }
            PauseAnimation { duration: 250 } // This puts a bit of time between the loop
        }

        TapHandler {
            // The animation starts running when you click within the rectangle
            onTapped: xAnim.running = true
        }
    }
}
Item {
    width: 320
    height: 120

    Rectangle {
        id: rectangle
        color: "yellow"
        width: 120
        height: 120

        TapHandler {
            // The animation starts running when you click within the rectangle
            onTapped: anim.running = true;
        }
    }

    // This animation specifically targets the Rectangle's properties to animate
    SequentialAnimation {
        id: anim
        // Animations on their own are not running by default
        // The default number of loops is one, restart the animation to see it again

        NumberAnimation { target: rectangle; property: "x"; from: 0; to: 200; duration: 500 }

        NumberAnimation { target: rectangle; property: "x"; from: 200; to: 0; duration: 500 }
    }
}