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** This file is part of the examples of Qt for Device Creation.
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import QtQuick
import StartupScreen

Item {
    id: root

    property bool available: false
    property bool connected: false
    signal pressed()

    state: !available ? "" : (connected ? "connected" : "error")

    // changing button state
    MouseArea {
        anchors.fill: parent
        onPressed: root.scale = 0.9
        onReleased: root.scale = 1.0
        onClicked: if (available) root.pressed()
    }

    // button icon
    Image {
        id: icon
        source: "assets/icon_usb.png"
        fillMode: Image.PreserveAspectFit
        anchors.centerIn: parent
        height: parent.height * 0.9
    }

    // marker for the states
    Image {
        id: markerBackground
        height: icon.height/2

        anchors.right: parent.right
        anchors.bottom: parent.bottom
        source: "assets/icon_markerBackground.png"
        anchors.rightMargin: 0
        anchors.bottomMargin: 0
        fillMode: Image.PreserveAspectFit

        Image {
            id: errorIcon
            height: parent.height * 0.5
            anchors.centerIn: parent
            source: "assets/icon_error.png"
            fillMode: Image.PreserveAspectFit
            opacity: 0
        }
        Image {
            id: unavailableIcon
            height: parent.height * 0.5
            anchors.centerIn: parent
            source: "assets/icon_nok.png"
            fillMode: Image.PreserveAspectFit
            opacity: 1
        }
        Image {
            id: okIcon
            height: parent.height * 0.5
            anchors.centerIn: parent
            source: "assets/icon_ok.png"
            fillMode: Image.PreserveAspectFit
            opacity: 0
        }
    }

    states: [
        State {
            name: "connected"
            PropertyChanges {
                target: errorIcon
                opacity: 0
            }
            PropertyChanges {
                target: unavailableIcon
                opacity: 0
            }
            PropertyChanges {
                target: okIcon
                opacity: 1
            }
        },
        State {
            name: "error"
            PropertyChanges {
                target: errorIcon
                opacity: 1
            }
            PropertyChanges {
                target: unavailableIcon
                opacity: 0
            }
            PropertyChanges {
                target: okIcon
                opacity: 0
            }
        }
    ]
    transitions: [
        Transition {
            from: "error"
            to: "connected"
            PropertyAnimation {
                duration: 200
                properties: "opacity"
            }
        },
        Transition {
            from: "connected"
            to: "error"
            PropertyAnimation {
                duration: 200
                properties: "opacity"

            }
        }
    ]
}

/*##^##
Designer {
    D{i:0;height:100;width:100}
}
##^##*/