Display layer view draw state

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// [WriteFile Name=DisplayLayerViewDrawState, Category=Maps]
// [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 "DisplayLayerViewDrawState.h"

// ArcGIS Maps SDK headers
#include "Error.h"
#include "FeatureLayer.h"
#include "LayerListModel.h"
#include "LayerViewState.h"
#include "Map.h"
#include "MapQuickView.h"
#include "MapTypes.h"
#include "Point.h"
#include "Portal.h"
#include "PortalItem.h"
#include "SpatialReference.h"
#include "Viewpoint.h"

// Qt headers
#include <QFuture>

using namespace Esri::ArcGISRuntime;

DisplayLayerViewDrawState::DisplayLayerViewDrawState(QObject* parent /* = nullptr */):
  QObject(parent),
  m_map(new Map(BasemapStyle::ArcGISTopographic, this))
{
}

DisplayLayerViewDrawState::~DisplayLayerViewDrawState() = default;

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

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

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

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

  connect(m_mapView, &MapQuickView::layerViewStateChanged, this, &DisplayLayerViewDrawState::onLayerViewStateCompleted);

  emit mapViewChanged();
}

void DisplayLayerViewDrawState::loadLayer()
{
  // load a feature layer from a portal item
  Portal* portal = new Portal(this);
  m_portalItem = new PortalItem(portal, "b8f4033069f141729ffb298b7418b653", this);
  m_featureLayer = new FeatureLayer(m_portalItem, 0, this);

  connect(m_featureLayer, &FeatureLayer::loadStatusChanged, this, [this] (LoadStatus loadStatus)
  {
    m_loading = (loadStatus == LoadStatus::Loading) ? true : false;
    emit loadingChanged();
  });

  // load feature layer and set the viewpoint
  connect(m_featureLayer, &FeatureLayer::doneLoading, this, [this](const Error& e)
  {
    if (!e.isEmpty())
      return;

    const Point point{-11000000, 4500000, SpatialReference::webMercator()};
    const Viewpoint vp{point, 40000000.0};
    m_mapView->setViewpointAsync(vp);
  });

  // set min/max scale to demonstrate different view states.
  m_featureLayer->setMinScale(400000000.0);
  m_featureLayer->setMaxScale(400000000.0 / 10);
  m_map->operationalLayers()->append(m_featureLayer);
}

void DisplayLayerViewDrawState::changeFeatureLayerVisibility(bool visible)
{
  if (m_featureLayer->loadStatus() == LoadStatus::Loaded)
    m_featureLayer->setVisible(visible);
}

void DisplayLayerViewDrawState::onLayerViewStateCompleted(Layer* layer, LayerViewState layerViewState)
{
  // check if feature layer has been created otherwise do nothing.
  if (!m_featureLayer)
    return;

  // only update the QStringList if the layer is the feature layer.
  if (layer->name() != m_featureLayer->name())
    return;

  // clear string list for new view state(s).
  m_viewStatuses.clear();

  if (layerViewState.statusFlags() & Esri::ArcGISRuntime::LayerViewStatus::Active)
    m_viewStatuses.append("Active");
  if (layerViewState.statusFlags() & Esri::ArcGISRuntime::LayerViewStatus::NotVisible)
    m_viewStatuses.append("NotVisible");
  if (layerViewState.statusFlags() & Esri::ArcGISRuntime::LayerViewStatus::OutOfScale)
    m_viewStatuses.append("OutOfScale");
  if (layerViewState.statusFlags() & Esri::ArcGISRuntime::LayerViewStatus::Loading)
    m_viewStatuses.append("Loading");
  if (layerViewState.statusFlags() & Esri::ArcGISRuntime::LayerViewStatus::Error)
    m_viewStatuses.append("Error");
  if (layerViewState.statusFlags() & Esri::ArcGISRuntime::LayerViewStatus::Warning)
  {
    m_viewStatuses.append("Warning");
    if (!layerViewState.error().isEmpty())
    {
      const QString warningMessage = QString("Warning message: %1").arg(layerViewState.error().message());
      m_warningMessage = warningMessage;
      emit warningMessageChanged();
    }
  }
  emit viewStatusChanged();
}