Display subtype feature layer

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// [WriteFile Name=DisplaySubtypeFeatureLayer, 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 "DisplaySubtypeFeatureLayer.h"

// ArcGIS Maps SDK headers
#include "Credential.h"
#include "Envelope.h"
#include "Error.h"
#include "FeatureLayer.h"
#include "LabelDefinition.h"
#include "LabelDefinitionListModel.h"
#include "LayerListModel.h"
#include "Map.h"
#include "MapQuickView.h"
#include "MapTypes.h"
#include "ServiceFeatureTable.h"
#include "ServiceTypes.h"
#include "SimpleLabelExpression.h"
#include "SimpleMarkerSymbol.h"
#include "SimpleRenderer.h"
#include "SpatialReference.h"
#include "SubtypeFeatureLayer.h"
#include "SubtypeSublayer.h"
#include "SymbolTypes.h"
#include "TextSymbol.h"
#include "Viewpoint.h"

using namespace Esri::ArcGISRuntime;

DisplaySubtypeFeatureLayer::DisplaySubtypeFeatureLayer(QObject* parent /* = nullptr */):
  QObject(parent),
  m_map(new Map(BasemapStyle::ArcGISStreetsNight, this)),
  m_cred(new Credential("viewer01", "I68VGU^nMurF", this)),
  m_alternateRenderer(new SimpleRenderer(new SimpleMarkerSymbol(SimpleMarkerSymbolStyle::Diamond, QColor(Qt::magenta), 20, this), this))
{
  m_busy = true;

  // create the feature table
  ServiceFeatureTable* featureTable = new ServiceFeatureTable(QUrl("https://sampleserver7.arcgisonline.com/server/rest/services/UtilityNetwork/NapervilleElectric/FeatureServer/0"), m_cred, this);
  // create the feature layer using the feature table
  m_subtypeFeatureLayer = new SubtypeFeatureLayer(featureTable, this);

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

  // set the viewpoint to Naperville, Illinois
  m_map->setInitialViewpoint(Viewpoint(Envelope(-9812691.11079696, 5128687.20710657, -9812377.9447607, 5128865.36767282, SpatialReference::webMercator())));

  // when subtype feature layer is loaded get the subtype sublayer street lights and define its labels
  connect(m_subtypeFeatureLayer, &SubtypeFeatureLayer::doneLoading, this, &DisplaySubtypeFeatureLayer::getSubtypeSublayerAndDefineLabels);
}

DisplaySubtypeFeatureLayer::~DisplaySubtypeFeatureLayer() = default;

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

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

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

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

  connect(m_mapView, &MapQuickView::mapScaleChanged, this, [this]()
  {
    m_mapScale = m_mapView->mapScale();
    emit mapScaleChanged();
  });

  emit mapViewChanged();
}

void DisplaySubtypeFeatureLayer::getSubtypeSublayerAndDefineLabels(const Error& e)
{
  if (!e.isEmpty())
    return;

  m_busy = false;
  emit busyChanged();

  if (!m_subtypeFeatureLayer)
    return;

  // get the Street Light sublayer and define its labels
  m_subtypeSublayer = m_subtypeFeatureLayer->sublayerWithSubtypeName("Street Light", this);
  m_labelDefinition = createLabelDefinition();

  if (!m_labelDefinition || !m_subtypeSublayer)
    return;

  m_subtypeSublayer->labelDefinitions()->append(m_labelDefinition);
  m_subtypeSublayer->setLabelsEnabled(true);

  // get the original renderer of the sublayer
  m_originalRenderer = m_subtypeSublayer->renderer();

  // Set a default minimum scale.
  m_subtypeSublayer->setMinScale(3000.0);
  m_sublayerMinScale = m_subtypeSublayer->minScale();
  emit sublayerMinScaleChanged();
}

void DisplaySubtypeFeatureLayer::switchSublayerVisibility()
{
  if (m_subtypeSublayer)
    m_subtypeSublayer->setVisible(!m_subtypeSublayer->isVisible());
}

void DisplaySubtypeFeatureLayer::setOringalRenderer()
{
  if (m_subtypeSublayer)
    m_subtypeSublayer->setRenderer(m_originalRenderer);
}

void DisplaySubtypeFeatureLayer::setAlternativeRenderer()
{
  if (m_subtypeSublayer)
    m_subtypeSublayer->setRenderer(m_alternateRenderer);
}

void DisplaySubtypeFeatureLayer::setSublayerMinScale()
{
  if (!m_subtypeSublayer)
    return;

  const double currentScale = m_mapView->mapScale();
  m_subtypeSublayer->setMinScale(currentScale);
  m_sublayerMinScale = currentScale;
  emit sublayerMinScaleChanged();
}

LabelDefinition* DisplaySubtypeFeatureLayer::createLabelDefinition()
{
  SimpleLabelExpression* labelExpression = new SimpleLabelExpression("[nominalvoltage]", this);

  TextSymbol* textSymbol = new TextSymbol(this);
  textSymbol->setSize(14);
  textSymbol->setColor(Qt::blue);
  textSymbol->setHaloColor(Qt::white);
  textSymbol->setHaloWidth(3);
  textSymbol->setHorizontalAlignment(HorizontalAlignment::Center);
  textSymbol->setVerticalAlignment(VerticalAlignment::Middle);

  LabelDefinition* labelDefinition = new LabelDefinition(labelExpression, textSymbol, this);
  labelDefinition->setPlacement(LabelingPlacement::PointAboveRight);
  labelDefinition->setUseCodedValues(true);
  return labelDefinition;
}