Change the visibility of sublayers.
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
- Create an
ArcGISMapImageLayer
object with the URL to a map image service. - Get the
ArcGISSublayerListModel
withmapImageLayer::mapImageSublayers()
. - 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
// [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 "MapTypes.h"
#include "LayerListModel.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;
}