Display draw status

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Get the draw status of your map view or scene view to know when all layers in the map or scene have finished drawing.

screenshot

Use case

You may want to display a loading indicator while layers are loading.

How it works

  1. Create a MapView and connect to the MapQuickView::drawStatusChanged signal.
  2. Use drawStatus on the to determine draw status.

Relevant API

  • Map
  • drawStatus
  • MapQuickView::drawStatusChanged
  • MapView

Tags

draw, loading, map, render

Sample Code

DisplayDrawingStatus.cppDisplayDrawingStatus.cppDisplayDrawingStatus.hDisplayDrawingStatus.qml
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// [WriteFile Name=DisplayDrawingStatus, Category=Maps]
// [Legal]
// Copyright 2016 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

#include "DisplayDrawingStatus.h"

#include "Map.h"
#include "MapQuickView.h"
#include "FeatureLayer.h"
#include "ServiceFeatureTable.h"

#include <QUrl>

using namespace Esri::ArcGISRuntime;

DisplayDrawingStatus::DisplayDrawingStatus(QQuickItem* parent):
  QQuickItem(parent)
{
}

DisplayDrawingStatus::~DisplayDrawingStatus() = default;

void DisplayDrawingStatus::init()
{
  qmlRegisterType<MapQuickView>("Esri.Samples", 1, 0, "MapView");
  qmlRegisterType<DisplayDrawingStatus>("Esri.Samples", 1, 0, "DisplayDrawingStatusSample");
}

void DisplayDrawingStatus::componentComplete()
{
  QQuickItem::componentComplete();

  // find QML MapView component
  m_mapView = findChild<MapQuickView*>("mapView");
  m_mapView->setWrapAroundMode(WrapAroundMode::Disabled);

  // Create a map using the topographic basemap
  m_map = new Map(BasemapStyle::ArcGISTopographic, this);
  m_map->setInitialViewpoint(Viewpoint(Envelope(-13639984, 4537387, -13606734, 4558866, SpatialReference::webMercator())));

  // create feature layer
  ServiceFeatureTable* featureTable = new ServiceFeatureTable(QUrl("https://sampleserver6.arcgisonline.com/arcgis/rest/services/DamageAssessment/FeatureServer/0"), this);
  m_featureLayer = new FeatureLayer(featureTable, this);

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

  // Set map to map view
  m_mapView->setMap(m_map);

  connect(m_mapView, &MapQuickView::drawStatusChanged, this, [this](DrawStatus drawStatus)
  {
    drawStatus == DrawStatus::InProgress ? m_mapDrawing = true : m_mapDrawing = false;
    emit mapDrawStatusChanged();
  });
}

bool DisplayDrawingStatus::mapDrawing() const
{
  return m_mapDrawing;
}

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