qt-everywhere-src-5.14.1/qtmultimedia/examples/multimedia/declarative-radio/view.qml

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import QtQuick 2.0
import QtMultimedia 5.0

Rectangle {
    anchors.fill: parent
    id: root
    property int margins: 5
    property int spacing: 10

    QtObject {
        id: d
        property int buttonHeight: root.height > root.width ? root.width / 3 : root.height / 3
        property int buttonWidth: (root.width - spacing * 4) / 4
    }

    Radio {
        id: radio
        band: Radio.FM
    }

    Column {
        anchors.fill: parent
        anchors.margins: root.margins

        Rectangle {
            color: root.color
            width: parent.width
            height: root.height - d.buttonHeight - 40

            Text {
                id: freq
                verticalAlignment: Text.AlignVCenter
                text: "" + radio.frequency / 1000 + " kHz"
                anchors {
                    bottom: parent.bottom
                    margins: root.margins
                }
            }
            Text {
                id: sig
                anchors {
                    bottom: parent.bottom
                    right: parent.right
                    margins: root.margins

                }

                verticalAlignment: Text.AlignVCenter
                text: (radio.availability == Radio.Available ? "No Signal " : "No Radio Found")
            }
        }

        Row {
            spacing: 5

            Rectangle {
                width: root.width - 10
                height: 20
                color: "black"

                Rectangle {
                    width: 5
                    height: 20
                    color: "red"

                    y: 0
                    x: (parent.width - 5) * ((radio.frequency - radio.minimumFrequency) / (radio.maximumFrequency -
                    radio.minimumFrequency))
                }
            }
        }
        Row {
            spacing: root.spacing
            Button {
                text: "Scan Down"
                onClicked: radio.scanDown()
            }
            Button {
                text: "Freq Down"
                onClicked: radio.tuneDown()
            }
            Button {
                text: "Freq Up"
                onClicked: radio.tuneUp()
            }
            Button {
                text: "Scan Up"
                onClicked: radio.scanUp()
            }
        }
    }
}