Change sublayer visibility

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Sample viewer app

Change the visibility of sublayers.

screenshot

Use case

A map image layer may contain many sublayers such as different types of roads in a road network or city, county, and state borders in a US map. The user may only be interested in a subset of these sublayers. Or, perhaps showing all of the sublayers would show too much detail. In these cases, you can hide certain sublayers by changing their visibility.

How to use the sample

Each sublayer has a check box which can be used to toggle the visibility of the sublayer.

How it works

  1. Create an ArcGISMapImageLayer object with the URL to a map image service.
  2. Get the ArcGISSublayerListModel with mapImageLayer::mapImageSublayers().
  3. For each layer in the sublayer list, set its visible property to true or false.

Relevant API

  • ArcGISMapImageLayer
  • ArcGISSublayerListModel

Tags

layer, sublayer, visibility

Sample Code

ChangeSublayerVisibility.cppChangeSublayerVisibility.cppChangeSublayerVisibility.hChangeSublayerVisibility.qml
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// [WriteFile Name=ChangeSublayerVisibility, Category=Layers]
// [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 "ChangeSublayerVisibility.h"

#include "Map.h"
#include "MapQuickView.h"
#include "Basemap.h"
#include "ArcGISMapImageLayer.h"
#include "ArcGISSublayerListModel.h"
#include "Point.h"
#include "Viewpoint.h"
#include "SpatialReference.h"
#include <QUrl>

using namespace Esri::ArcGISRuntime;

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

ChangeSublayerVisibility::~ChangeSublayerVisibility() = default;

void ChangeSublayerVisibility::init()
{
  qmlRegisterType<MapQuickView>("Esri.Samples", 1, 0, "MapView");
  qmlRegisterType<ChangeSublayerVisibility>("Esri.Samples", 1, 0, "ChangeSublayerVisibilitySample");
  qmlRegisterUncreatableType<QAbstractListModel>("Esri.Samples", 1, 0, "AbstractListModel", "AbstractListModel is uncreateable");
}

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

  // find QML MapView component
  m_mapView = findChild<MapQuickView*>("mapView");

  // create a new map instance
  m_map = new Map(BasemapStyle::ArcGISTopographic, this);
  m_map->setInitialViewpoint(Viewpoint(Point(-11e6, 6e6, SpatialReference(102100)), 9e7));

  // add the map image layer
  m_mapImageLayer = new ArcGISMapImageLayer(QUrl("https://sampleserver6.arcgisonline.com/arcgis/rest/services/SampleWorldCities/MapServer"), this);
  m_map->operationalLayers()->append(m_mapImageLayer);

  // set map on the map view
  m_mapView->setMap(m_map);

  // set the map image layer's sublayer list model to the Q_PROPERTY
  m_sublayerModel = m_mapImageLayer->mapImageSublayers();
  emit sublayerModelChanged();
}

QAbstractListModel* ChangeSublayerVisibility::sublayerModel()
{
  return m_sublayerModel;
}

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