Create a feature collection layer from a portal item.
Use case
Feature collection layers are often used to hold features with mixed geometry or unstructured data. You can display feature collections stored in a Portal, which are often used for showing content from a CSV or map notes.
How to use the sample
The feature collection is loaded from the Portal item when the sample starts.
How it works
- Create a
Portal. - Create the
PortalItem, referring to the portal and an item ID. - Verify that the item represents a feature collection.
- Create a
FeatureCollectionfrom the item. - Create a
FeatureCollectionLayer, referring to the feature collection. - Add the feature collection layer to the map's
OperationalLayerscollection.
Relevant API
- FeatureCollection
- FeatureCollectionLayer
- Portal
- PortalItem
About the data
The sample uses a sample layer depicting world populations.
Tags
collection, feature collection, feature collection layer, id, item, map notes, portal
Sample Code
// [WriteFile Name=FeatureCollectionLayerFromPortal, Category=Layers] // [Legal] // Copyright 2020 Esri. // // Licensed under the Apache License, Version 2.0 (the "License"); // you may not use this file except in compliance with the License. // You may obtain a copy of the License at // http://www.apache.org/licenses/LICENSE-2.0 // // Unless required by applicable law or agreed to in writing, software // distributed under the License is distributed on an "AS IS" BASIS, // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. // See the License for the specific language governing permissions and // limitations under the License. // [Legal] #ifdef PCH_BUILD #include "pch.hpp" #endif // PCH_BUILD // sample headers #include "FeatureCollectionLayerFromPortal.h" // ArcGIS Maps SDK headers #include "Error.h" #include "FeatureCollection.h" #include "FeatureCollectionLayer.h" #include "LayerListModel.h" #include "Map.h" #include "MapQuickView.h" #include "MapTypes.h" #include "Portal.h" #include "PortalItem.h" #include "PortalTypes.h" using namespace Esri::ArcGISRuntime; namespace { const QString featureCollectionItemId("32798dfad17942858d5eef82ee802f0b"); } FeatureCollectionLayerFromPortal::FeatureCollectionLayerFromPortal(QObject* parent /* = nullptr */): QObject(parent), m_map(new Map(BasemapStyle::ArcGISOceans, this)) { Portal* portal = new Portal(this); m_portalItem = new PortalItem(portal, featureCollectionItemId, this); connect(m_portalItem, &PortalItem::doneLoading, this, [this](const Error& loadError) { if (!loadError.isEmpty()) { qWarning() << loadError.message() << loadError.additionalMessage(); return; } // if the portal item is a feature collection, add the feature collection to the map's operational layers if (m_portalItem->type() == PortalItemType::FeatureCollection) { FeatureCollection* featureCollection = new FeatureCollection(m_portalItem, this); FeatureCollectionLayer* featureCollectionLayer = new FeatureCollectionLayer(featureCollection, this); m_map->operationalLayers()->append(featureCollectionLayer); } else { qWarning() << "Portal item with ID " << featureCollectionItemId << " is not a feature collection."; } }); m_portalItem->load(); } FeatureCollectionLayerFromPortal::~FeatureCollectionLayerFromPortal() = default; void FeatureCollectionLayerFromPortal::init() { // Register the map view for QML qmlRegisterType<MapQuickView>("Esri.Samples", 1, 0, "MapView"); qmlRegisterType<FeatureCollectionLayerFromPortal>("Esri.Samples", 1, 0, "FeatureCollectionLayerFromPortalSample"); } MapQuickView* FeatureCollectionLayerFromPortal::mapView() const { return m_mapView; } // Set the view (created in QML) void FeatureCollectionLayerFromPortal::setMapView(MapQuickView* mapView) { if (!mapView || mapView == m_mapView) return; m_mapView = mapView; m_mapView->setMap(m_map); emit mapViewChanged(); }