Display a WFS layer

// [WriteFile Name=DisplayWfsLayer, Category=Layers]
// [Legal]
// Copyright 2019 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 "DisplayWfsLayer.h"

// ArcGIS Maps SDK headers
#include "CoreTypes.h"
#include "Envelope.h"
#include "Error.h"
#include "FeatureLayer.h"
#include "GeodatabaseTypes.h"
#include "LayerListModel.h"
#include "Map.h"
#include "MapQuickView.h"
#include "MapTypes.h"
#include "Polygon.h"
#include "QueryParameters.h"
#include "SimpleLineSymbol.h"
#include "SimpleRenderer.h"
#include "SpatialReference.h"
#include "SymbolTypes.h"
#include "Viewpoint.h"
#include "WfsFeatureTable.h"

// Qt headers
#include <QFuture>

using namespace Esri::ArcGISRuntime;

DisplayWfsLayer::DisplayWfsLayer(QObject* parent /* = nullptr */):
  QObject(parent),
  m_map(new Map(BasemapStyle::ArcGISTopographic, this))
{
  // create WFS Feature Table
  m_wfsFeatureTable = new WfsFeatureTable(QUrl("https://dservices2.arcgis.com/ZQgQTuoyBrtmoGdP/arcgis/services/Seattle_Downtown_Features/WFSServer?service=wfs&request=getcapabilities"),
                                          "Seattle_Downtown_Features:Buildings", this);

  // Set feature request mode to manual - only manual is supported at v100.5.
  // In this mode, you must manually populate the table - panning and zooming
  // won't request features automatically.
  m_wfsFeatureTable->setFeatureRequestMode(FeatureRequestMode::ManualCache);

  // populate the feature table once loaded
  connect(m_wfsFeatureTable, &WfsFeatureTable::doneLoading, this, [this](const Error& e)
  {
    if (e.isEmpty())
      populateWfsFeatureTable();
  });

  // create feature layer from the feature table
  FeatureLayer* featureLayer = new FeatureLayer(m_wfsFeatureTable, this);

  // add a renderer to the layer
  SimpleLineSymbol* sls = new SimpleLineSymbol(SimpleLineSymbolStyle::Solid, QColor("red"), 3.0f, this);
  SimpleRenderer* sr = new SimpleRenderer(sls, this);
  featureLayer->setRenderer(sr);

  // add the layer to the map
  m_map->operationalLayers()->append(featureLayer);

  // set initial viewpoint
  Envelope env(-122.341581, 47.613758, -122.332662, 47.617207, SpatialReference::wgs84());
  m_map->setInitialViewpoint(Viewpoint(env));
}

DisplayWfsLayer::~DisplayWfsLayer() = default;

void DisplayWfsLayer::init()
{
  // Register the map view for QML
  qmlRegisterType<MapQuickView>("Esri.Samples", 1, 0, "MapView");
  qmlRegisterType<DisplayWfsLayer>("Esri.Samples", 1, 0, "DisplayWfsLayerSample");
}

MapQuickView* DisplayWfsLayer::mapView() const
{
  return m_mapView;
}

// Set the view (created in QML)
void DisplayWfsLayer::setMapView(MapQuickView* mapView)
{
  if (!mapView || mapView == m_mapView)
  {
    return;
  }

  m_mapView = mapView;
  m_mapView->setMap(m_map);

  connect(m_mapView, &MapQuickView::navigatingChanged, this, [this]()
  {
    if (m_mapView->isNavigating())
      return;

    populateWfsFeatureTable();
  });

  emit mapViewChanged();
}

void DisplayWfsLayer::populateWfsFeatureTable()
{
  if (!m_mapView || !m_wfsFeatureTable)
    return;

  // create query parameters
  QueryParameters params;
  params.setGeometry(m_mapView->visibleArea().extent());
  params.setSpatialRelationship(SpatialRelationship::Intersects);

  // query the service
  constexpr bool clearCache = false;
  const QStringList outFields = {"*"};
  auto future = m_wfsFeatureTable->populateFromServiceAsync(params, clearCache, outFields);
  Q_UNUSED(future)
}

// [WriteFile Name=DisplayWfsLayer, Category=Layers]
// [Legal]
// Copyright 2019 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]

#ifndef DISPLAYWFSLAYER_H
#define DISPLAYWFSLAYER_H

// Qt headers
#include <QObject>

namespace Esri::ArcGISRuntime
{
class Map;
class MapQuickView;
class WfsFeatureTable;
}

Q_MOC_INCLUDE("MapQuickView.h")

class DisplayWfsLayer : public QObject
{
  Q_OBJECT

  Q_PROPERTY(Esri::ArcGISRuntime::MapQuickView* mapView READ mapView WRITE setMapView NOTIFY mapViewChanged)

public:
  explicit DisplayWfsLayer(QObject* parent = nullptr);
  ~DisplayWfsLayer();

  static void init();

signals:
  void mapViewChanged();

private:
  Esri::ArcGISRuntime::MapQuickView* mapView() const;
  void setMapView(Esri::ArcGISRuntime::MapQuickView* mapView);
  void populateWfsFeatureTable();

  Esri::ArcGISRuntime::Map* m_map = nullptr;
  Esri::ArcGISRuntime::MapQuickView* m_mapView = nullptr;
  Esri::ArcGISRuntime::WfsFeatureTable* m_wfsFeatureTable = nullptr;
};

#endif // DISPLAYWFSLAYER_H

// [WriteFile Name=DisplayWfsLayer, Category=Layers]
// [Legal]
// Copyright 2019 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]

import QtQuick
import QtQuick.Controls
import Esri.Samples

Item {

    // add a mapView component
    MapView {
        id: view
        anchors.fill: parent

        Component.onCompleted: {
            // Set the focus on MapView to initially enable keyboard navigation
            forceActiveFocus();
        }
    }

    // Declare the C++ instance which creates the map etc. and supply the view
    DisplayWfsLayerSample {
        id: model
        mapView: view
    }
}

// [Legal]
// Copyright 2019 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]

// sample headers
#include "DisplayWfsLayer.h"

// ArcGIS Maps SDK headers
#include "ArcGISRuntimeEnvironment.h"

// Qt headers
#include <QDir>
#include <QGuiApplication>
#include <QQmlApplicationEngine>

// Platform specific headers
#ifdef Q_OS_WIN
#include <Windows.h>
#endif

#define STRINGIZE(x) #x
#define QUOTE(x) STRINGIZE(x)

int main(int argc, char *argv[])
{
  Esri::ArcGISRuntime::ArcGISRuntimeEnvironment::setUseLegacyAuthentication(false);
  QGuiApplication app(argc, argv);
  app.setApplicationName(QString("DisplayWfsLayer"));

  // Use of ArcGIS location services, such as basemap styles, geocoding, and routing services,
  // requires an access token. For more information see
  // https://links.esri.com/arcgis-runtime-security-auth.

  // The following methods grant an access token:

  // 1. User authentication: Grants a temporary access token associated with a user's ArcGIS account.
  // To generate a token, a user logs in to the app with an ArcGIS account that is part of an
  // organization in ArcGIS Online or ArcGIS Enterprise.

  // 2. API key authentication: Get a long-lived access token that gives your application access to
  // ArcGIS location services. Go to the tutorial at https://links.esri.com/create-an-api-key.
  // Copy the API Key access token.

  const QString accessToken = QString("");

  if (accessToken.isEmpty())
  {
      qWarning() << "Use of ArcGIS location services, such as the basemap styles service, requires" <<
                    "you to authenticate with an ArcGIS account or set the API Key property.";
  }
  else
  {
      Esri::ArcGISRuntime::ArcGISRuntimeEnvironment::setApiKey(accessToken);
  }

  // Initialize the sample
  DisplayWfsLayer::init();

  QString arcGISRuntimeImportPath = QUOTE(ARCGIS_RUNTIME_IMPORT_PATH);

#if defined(LINUX_PLATFORM_REPLACEMENT)
  // on some linux platforms the string 'linux' is replaced with 1
  // fix the replacement paths which were created
  QString replaceString = QUOTE(LINUX_PLATFORM_REPLACEMENT);
  arcGISRuntimeImportPath = arcGISRuntimeImportPath.replace(replaceString, "linux", Qt::CaseSensitive);
#endif

  // Initialize application view
  QQmlApplicationEngine engine;
  // Add the import Path
  engine.addImportPath(QDir(QCoreApplication::applicationDirPath()).filePath("qml"));
  // Add the Runtime and Extras path
  engine.addImportPath(arcGISRuntimeImportPath);

  // Set the source
  engine.load(QUrl("qrc:/Samples/Layers/DisplayWfsLayer/main.qml"));

  return app.exec();
}

// Copyright 2019 ESRI
//
// All rights reserved under the copyright laws of the United States
// and applicable international laws, treaties, and conventions.
//
// You may freely redistribute and use this sample code, with or
// without modification, provided you include the original copyright
// notice and use restrictions.
//
// See the Sample code usage restrictions document for further information.
//

import QtQuick.Controls
import Esri.Samples

ApplicationWindow {
    visible: true
    width: 800
    height: 600

    DisplayWfsLayer {
        anchors.fill: parent
    }
}