appstudio-positionsource-sample.qml

appstudio-positionsource-sample.qml

import QtQuick 2.7
import QtQuick.Layouts 1.3
import QtQuick.Controls 2.1
import ArcGIS.AppFramework.Devices 1.0
import ArcGIS.AppFramework.Positioning 1.0

Item {
    property DeviceListModel deviceListModel: discoveryAgent.devices
    property Device currentDevice
    property Position currentPosition

    ColumnLayout {
        anchors.fill: parent
        anchors.margins: 10

        ComboBox {
            id: comboBox
            Layout.fillWidth: true
            model: deviceListModel
            textRole: "name"
            onCurrentTextChanged: selectDevice(deviceListModel.get(currentIndex))
        }

        ListView {
            id: listView
            property var fields: [
                "latitude",
                "longitude",
                "altitude",
                "timestamp",
                "speed",
                "horizontalAccuracy",
                "verticalAccuracy",
                "direction",
                "verticalSpeed",
                "magneticVariation",
                "hdop",
                "pdop",
                "gdop",
                "vdop",
                "fixType",
                "differentialAge",
                "referenceStationId",
                "satellitesVisible",
                "satellitesInUse",
                "positionAccuracy",
                "geoidSeparation"
            ]
            Layout.fillWidth: true
            Layout.fillHeight: true
            model: currentPosition != null ? fields : 0
            delegate: Text { text: "%1: %2".arg(modelData).arg(getPositionValue(modelData)) }
        }
    }

    DeviceDiscoveryAgent {
        id: discoveryAgent
    }

    NmeaSource {
        id: nmeaSource
    }

    PositionSource {
        id: positionSource
        active: false
        nmeaSource: nmeaSource
        onPositionChanged: currentPosition = position
    }

    Connections {
        target: deviceListModel
        onCountChanged: if (comboBox.currentIndex == -1 && deviceListModel.count > 0) { comboBox.currentIndex = 0; }
    }

    function selectDevice(device) {
        positionSource.active = false;
        currentDevice = device;
        nmeaSource.source = currentDevice;
        positionSource.active = true;
    }

    function getPositionValue(key) {
        var nan = "NaN";
        if (!currentPosition) return nan;
        if (!currentPosition[key + "Valid"]) return nan;
        return currentPosition.coordinate[key] || currentPosition[key];
    }

    Component.onCompleted: discoveryAgent.start()
}