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ArcGIS Runtime SDK for Qt

Change sublayer visibility

Sample Viewer View Sample on GitHub

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

  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
  • SubLayerList

Tags

layer, sublayer, visibility

Sample Code

import QtQuick 2.6
import QtQuick.Controls 2.2
import Esri.ArcGISRuntime 100.9

Rectangle {
    width: 800
    height: 600    

    // Create the MapView
    MapView {
        anchors.fill: parent
        // Nest the Map as a child of the MapView
        Map {
            // Nest the Basemap to add it as the Map's Basemap
            BasemapTopographic {}

            // Nest an ArcGISMapImage Layer in the Map to add it as an operational layer
            ArcGISMapImageLayer {
                id: mapImageLayer
                url: "https://sampleserver6.arcgisonline.com/arcgis/rest/services/SampleWorldCities/MapServer"
            }

            initialViewpoint: ViewpointCenter {
                center: Point {
                    x: -11e6
                    y: 6e6
                    spatialReference: SpatialReference {wkid: 102100}
                }
                targetScale: 9e7
            }
        }
    }

    // Create a window to display the sublayers
    Rectangle {
        id: layerVisibilityRect
        anchors {
            margins: 10
            left: parent.left
            top: parent.top
        }
        height: 150
        width: 150
        color: "transparent"

        MouseArea {
            anchors.fill: parent
            onClicked: mouse.accepted = true
            onWheel: wheel.accepted = true
        }

        Rectangle {
            anchors.fill: parent
            width: layerVisibilityRect.width
            height: layerVisibilityRect.height
            color: "lightgrey"
            opacity: .9
            radius: 5
            border {
                color: "#4D4D4D"
                width: 1
            }


            Column {
                anchors {
                    fill: parent
                    margins: 10
                }

                Text {
                    width: parent.width
                    text: "Sublayers"
                    wrapMode: Text.WordWrap
                    clip: true
                    font {
                        pointSize: 14
                        bold: true
                    }
                }

                // Create a list view to display the items
                ListView {
                    id: layerVisibilityListView
                    anchors.margins: 10
                    width: parent.width
                    height: parent.height
                    clip: true

                    // Assign the model to the list model of sublayers
                    model: mapImageLayer.mapImageSublayers

                    // Assign the delegate to the delegate created above
                    delegate: Item {
                        id: layerVisibilityDelegate
                        width: parent.width
                        height: 35

                        Row {
                            spacing: 5
                            Text {
                                anchors.verticalCenter: parent.verticalCenter
                                width: 75
                                text: name
                                wrapMode: Text.WordWrap
                                font.pointSize: 14
                            }

                            Switch {
                                anchors.verticalCenter: parent.verticalCenter
                                checked: sublayerVisible

                                onCheckedChanged: {
                                    sublayerVisible = checked;
                                }
                            }
                        }
                    }
                }
            }
        }
    }
}