qt-everywhere-src-5.14.1/qtlocation/examples/location/geojson_viewer/GeoJsonDelegate.qml

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** Copyright (C) 2019 Julian Sherollari <jdotsh@gmail.com>
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import QtQuick 2.12
import QtPositioning 5.12
import QtLocation 5.12
import Qt.labs.qmlmodels 1.0

DelegateChooser {
    id: dc
    role: "type"
    property color defaultColor: "grey"
    property real defaultOpacity: 0.7

    DelegateChoice {
        roleValue: "Point"
        delegate: MapCircle {
            property string geojsonType: "Point"
            property var props: modelData.properties
            geoShape: modelData.data
            radius: 20*1000
            border.width: 3
            opacity: dc.defaultOpacity
            /* The expression below is equivalent to:
               ((props !== undefined && props["color"] !== undefined) ? props["color"] :
               ((parent && parent.props !== undefined && parent.props["color"] !== undefined) ? parent.props["color"] : dc.defaultColor))
            */
            color: (props && props.color) || (parent && parent.props && parent.props.color) || dc.defaultColor
        }
    }

    DelegateChoice {
        roleValue: "LineString"
        delegate: MapPolyline {
            property string geojsonType: "LineString"
            property var props: modelData.properties
            geoShape: modelData.data
            line.width: 3
            opacity: dc.defaultOpacity
            line.color: (props && props.color) || (parent && parent.props && parent.props.color) || dc.defaultColor
        }
    }

    DelegateChoice {
        roleValue: "Polygon"
        delegate: MapPolygon {
            property string geojsonType: "Polygon"
            property var props: modelData.properties
            geoShape: modelData.data
            opacity: dc.defaultOpacity
            color: (props && props.color) || (parent && parent.props && parent.props.color) || dc.defaultColor
            border.width: 0
        }
    }

    DelegateChoice {
        roleValue: "MultiPoint"
        delegate: MapItemView {
            property string geojsonType: "MultiPoint"
            property var props: modelData.properties
            model: modelData.data
            delegate: dc
        }
    }

    DelegateChoice {
        roleValue: "MultiLineString"
        delegate: MapItemView {
            property string geojsonType: "MultiLineString"
            property var props: modelData.properties
            model: modelData.data
            delegate: dc
        }
    }

    DelegateChoice {
        roleValue: "MultiPolygon"
        delegate: MapItemView {
            property string geojsonType: "MultiPolygon"
            property var props: modelData.properties
            model: modelData.data
            delegate: dc
        }
    }

    DelegateChoice {
        roleValue: "GeometryCollection"
        delegate: MapItemView {
            property string geojsonType: "GeometryCollection"
            property var props: modelData.properties
            model: modelData.data
            delegate: dc
        }
    }

    // Features are explicitly not generated by the parser, but converted straight to their content + the properties.

    DelegateChoice {
        roleValue: "FeatureCollection"
        delegate: MapItemView {
            property string geojsonType: "FeatureCollection"
            property var props: modelData.properties
            model: modelData.data
            delegate: dc
        }
    }
}