Displays a composite layer of all the subtype values in a feature class.
Use case
This is useful for controlling labeling, visibility and symbology of a given subtype as though they are distinct layers on the map.
How to use the sample
The sample loads with the sublayer visible on the map. Toggle its visibility with the "Show sublayer" checkbox. Change the sublayer's renderer with the radio buttons, using "Show original renderer" or "Show alternative renderer", and set its minimum scale using the "Set sublayer minimum scale" button. This will set the sublayer's minimum scale to that of the current map scale. Zoom in and out to see the sublayer become visible based on its new scale range.
How it works
- Create a
SubtypeFeatureLayerfrom aServiceFeatureTablethat defines a subtype, and add it to theMap. - Get a
SubtypeSublayerfrom the subtype feature using its name. - Enable the sublayer's labels and define them with
LabelDefinitions. - Set the visibility status by setting this sublayer's
visibleproperty. - Change the sublayer's symbology with
SubtypeSublayer.renderer. - Update the sublayer's minimum scale value with
SubtypeSublayer.minScale.
Relevant API
- LabelDefinition
- ServiceFeatureTable
- SimpleLabelExpression
- SubtypeFeatureLayer
- SubtypeSublayer
- TextSymbol
About the data
The Naperville electrical network feature service, hosted on ArcGIS Online (authentication required: this is handled within the sample code), contains a utility network with asset classification for different devices.
Additional information
Using utility network on ArcGIS Enterprise 10.8 requires an ArcGIS Enterprise member account licensed with the Utility Network user type extension. Please refer to the utility network services documentation.
Credentials:
- Username: viewer01
- Password: I68VGU^nMurF
Tags
asset group, feature layer, labeling, sublayer, subtype, symbology, utility network, visible scale range
Sample Code
DisplaySubtypeFeatureLayer.qml
// [WriteFile Name=DisplaySubtypeFeatureLayer, Category=Layers]
// [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]
import QtQuick
import QtQuick.Controls
import QtQuick.Layouts
import QtQuick.Shapes
import Esri.ArcGISRuntime
Rectangle {
id: rootRectangle
clip: true
width: 800
height: 600
property var subtypeSublayer
property var originalRenderer
property double mapScale: mapView ? mapView.mapScale : 0
MapView {
id: mapView
anchors.fill: parent
Component.onCompleted: {
// Set the focus on MapView to initially enable keyboard navigation
forceActiveFocus();
}
Map {
Basemap {
initStyle: Enums.BasemapStyleArcGISStreetsNight
}
// create the feature layer
SubtypeFeatureLayer {
id: subtypeFeatureLayer
// feature table
ServiceFeatureTable {
id: featureTable
url: "https://sampleserver7.arcgisonline.com/server/rest/services/UtilityNetwork/NapervilleElectric/FeatureServer/0"
Credential {
username: "viewer01"
password: "I68VGU^nMurF"
}
}
LabelDefinition {
id: subtypeSublayerLabelDefinition
placement: Enums.LabelingPlacementPointAboveRight
useCodedValues: true
expression: SimpleLabelExpression {
expression: "[nominalvoltage]"
}
textSymbol: TextSymbol {
size: 14
color: "blue"
haloColor: "white"
haloWidth: 3
horizontalAlignment: Enums.HorizontalAlignmentCenter
verticalAlignment: Enums.VerticalAlignmentMiddle
}
}
onLoadStatusChanged: {
if (loadStatus != Enums.LoadStatusLoaded)
return;
// get the Street Light sublayer and define its labels
subtypeSublayer = subtypeFeatureLayer.sublayerWithSubtypeName("Street Light");
if (!subtypeSublayer)
return;
subtypeSublayer.labelDefinitions.append(subtypeSublayerLabelDefinition);
subtypeSublayer.labelsEnabled = true;
// get the original renderer of the sublayer
originalRenderer = subtypeSublayer.renderer;
// set a default minimum scale
subtypeSublayer.minScale = 3000.0;
}
onErrorChanged: print("%1 - %2 - %3 - %4".arg(error.code, error.domain, error.message, error.additionalMessage));
}
ViewpointExtent {
extent: Envelope {
xMin: -9812691.11079696
yMin: 5128687.20710657
xMax: -9812377.9447607
yMax: 5128865.36767282
}
}
}
SimpleRenderer {
id: alternativeRenderer
SimpleMarkerSymbol {
style: Enums.SimpleMarkerSymbolStyleDiamond
color: "magenta"
size: 20
}
}
Rectangle {
id: controlsBox
anchors {
left: parent.left
top: parent.top
margins: 3
}
width: childrenRect.width
height: childrenRect.height
color: "lightgrey"
opacity: 0.8
radius: 5
// catch mouse signals from propagating to parent
MouseArea {
anchors.fill: parent
onClicked: mouse => mouse.accepted = true
onWheel: wheel => wheel.accepted = true
}
ColumnLayout {
id: controlItemsLayout
CheckBox {
text: qsTr("Show sublayer")
Layout.margins: 2
Layout.alignment: Qt.AlignLeft
checked: true
enabled: subtypeFeatureLayer.loadStatus === Enums.LoadStatusLoaded ? true : false
onCheckedChanged: subtypeSublayer ? subtypeSublayer.visible = !subtypeSublayer.visible : null
}
RadioButton {
text: qsTr("Show original renderer")
Layout.margins: 2
Layout.alignment: Qt.AlignLeft
checked: true
enabled: subtypeFeatureLayer.loadStatus === Enums.LoadStatusLoaded ? true : false
onCheckedChanged: {
if (checked && subtypeSublayer)
subtypeSublayer.renderer = originalRenderer;
}
}
RadioButton {
text: qsTr("Show alternative renderer")
Layout.margins: 2
Layout.alignment: Qt.AlignLeft
enabled: subtypeFeatureLayer.loadStatus === Enums.LoadStatusLoaded ? true : false
onCheckedChanged: {
if (checked && subtypeSublayer)
subtypeSublayer.renderer = alternativeRenderer;
}
}
Shape {
id: pageBreak
height: 2
ShapePath {
strokeWidth: 1
strokeColor: "black"
strokeStyle: ShapePath.SolidLine
startX: 2; startY: 0
PathLine { x: controlItemsLayout.width - 2 ; y: 0 }
}
}
Text {
text: qsTr("Current map scale: 1:%1".arg(Math.round(mapScale)))
Layout.margins: 2
Layout.alignment: Qt.AlignLeft
}
Text {
text: subtypeSublayer ? qsTr("Sublayer min scale: 1:%1".arg(Math.round(subtypeSublayer.minScale))) : qsTr("Sublayer min scale:")
Layout.margins: 2
Layout.alignment: Qt.AlignLeft
}
Button {
text: qsTr("Set sublayer minimum scale")
Layout.margins: 2
Layout.alignment: Qt.AlignLeft
enabled: subtypeFeatureLayer.loadStatus === Enums.LoadStatusLoaded ? true : false
onClicked: subtypeSublayer ? subtypeSublayer.minScale = Math.ceil(mapScale) : null
}
}
}
BusyIndicator {
id: busy
anchors.centerIn: parent
visible: subtypeFeatureLayer.loadStatus !== Enums.LoadStatusLoaded ? true : false
}
}
}