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Highlighting the country on the map when you hover over



  • I want to highlight the country when I hover over it. To do this, I took QStandardItemModel with the polygons of the desired countries. The problem is that the onClicked event works as expected, but onEntered and onExited fire in the rectangle, at the extreme coordinates, and not in the polygon. Is it possible for onEntered and onExited to work in the same area as onClicked? Perhaps there is some other solution for highlighting countries? I looked towards MaskedMouseArea but as a resource you need to set QImage. Thanks in advance for any help.
    qml

    Window {
        visible: true
        width: 640
        height: 480
        title: qsTr("Hello World")
    
        Map {
            id: map
            anchors.fill: parent
            center: QtPositioning.coordinate(45.137451890638886, -68.13734351262877)
            plugin: Plugin {
                name: "osm"
    
            }
            zoomLevel: 1
    
            MapItemView{
                model: polygonmodel
                delegate: MapPolygon {
                    color: "blue"
                    border.color: "green"
                    border.width: 1
                    smooth: true
                    opacity: 0.25
                    geoShape: model.polygon
    
                MouseArea{
                  anchors.fill: parent
                  hoverEnabled : true
                  onEntered:
                  {
                      border.color = "red"
                      border.width =3
                  }
                  onExited:
                  {
                      border.color = "white"
                      border.width = 1
                  }
                  onClicked:
                  {
                        console.log("onClicked:")
                  }
                }
              }
            }
        }
    }
    

    main.cpp

    #include <QGuiApplication>
    #include <QQmlApplicationEngine>
    #include <QGeoPolygon>
    #include <QStandardItem>
    #include <QQmlContext>
    
    class PolygonItem: public QStandardItem
    {
    public:
        PolygonItem(QString Name, const QGeoPolygon &polygon);
        QString Name() const;
        QGeoPolygon polygon() const;
    };
    
    class PolygonItemModel: public QStandardItemModel{
    public:
        PolygonItemModel(QObject *parent=nullptr);
        void addPolygonItem(PolygonItem *item);
    };
    
    enum PolygonRole{
        NameRole,
        GeopolygonRole,
        };
    
    PolygonItem::PolygonItem(QString name, const QGeoPolygon &polygon):
        QStandardItem()
    {
        setData(name, NameRole);
        setData(QVariant::fromValue(polygon), GeopolygonRole);
    }
    
    PolygonItemModel::PolygonItemModel(QObject *parent):
        QStandardItemModel(parent)
    {
        setItemRoleNames({{NameRole, "name"},
        {GeopolygonRole, "polygon"}});
    }
    
    void PolygonItemModel::addPolygonItem(PolygonItem *item)
    {
        appendRow(item);
    }
    
    const std::vector<std::pair<double, double>> Namibia =
    {
        {
            {14.52484512329101562,-22.69206619262695312},
            {14.52739906311035156,-22.6679534912109375},
            {14.52458286285400391,-22.62903022766113281},
            {14.51138877868652344,-22.5527801513671875},
            {14.41638755798339844,-22.33444595336914062},
            {14.38763809204101562,-22.28347396850585938},
            {14.28583145141601562,-22.1233367919921875},
            {14.127777099609375,-21.94055557250976562},
            {14.10249900817871094,-21.91403007507324219},
            {14.04249954223632812,-21.86222457885742188},
            {13.95267200469970703,-21.77889060974121094},
            {13.96798419952392578,-21.73465538024902344},
            {13.95666599273681641,-21.70194625854492188},
            {13.93555545806884766,-21.67444610595703125},
            {13.87791538238525391,-21.59458541870117188},
            {13.70111083984375,-21.296112060546875},
            {13.57694435119628906,-21.12916946411132812},
            {13.40388774871826172,-20.86236381530761719},
            {13.38499832153320312,-20.8244476318359375},
            {13.19888877868652344,-20.23833465576171875},
            {13.17499923706054688,-20.18083572387695312},
            {13.15972137451171875,-20.15472412109375},
            {13.14027595520019531,-20.13111114501953125},
            {13.11666584014892578,-20.11507225036621094},
            {13.08444404602050781,-20.09944534301757812},
            {13.05569267272949219,-20.07361221313476562},
            {13.04194355010986328,-20.04639053344726562},
            {13.03027725219726562,-20.00139236450195312},
            {12.989166259765625,-19.90944671630859375},
            {12.9797210693359375,-19.89139175415039062},
            {12.97027587890625,-19.8733367919921875},
            {12.9444427490234375,-19.82389068603515625},
            {12.92777633666992188,-19.789306640625},
            {12.81194305419921875,-19.59833526611328125},
            {12.79138755798339844,-19.56500244140625},
            {12.77333641052246094,-19.539093017578125},
            {12.70722198486328125,-19.41777801513671875},
            {12.69861030578613281,-19.399169921875},
            {12.68805503845214844,-19.36944580078125},
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            {15.49694442749023438,-17.38944625854492188},
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            {17.27883148193359375,-17.39222335815429688},
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            {17.56166458129882812,-17.39083480834960938},
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            {18.1888885498046875,-17.3872222900390625},
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        }
    };
    
    int main(int argc, char *argv[])
    {
        QGuiApplication app(argc, argv);
        QQmlApplicationEngine engine;
    
        PolygonItemModel model;
        engine.rootContext()->setContextProperty("polygonmodel", &model);
        const QUrl url(QStringLiteral("qrc:/main.qml"));
        engine.load(url);
    
        QGeoPolygon polygon;
    
        for (int i = 0; i < Namibia.size(); i++)
        {
            polygon.addCoordinate(QGeoCoordinate(Namibia[i].second, Namibia[i].first));
        }
    
        PolygonItem *item = new PolygonItem("Namibia", polygon);
        model.addPolygonItem(item);
        return app.exec();
    }
    

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