Edit features with feature-linked annotation

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Edit feature attributes which are linked to annotation through an expression.

screenshot

Use case

Annotation is useful for displaying text that you don't want to move or resize when the map is panned or zoomed (unlike labels which will move and resize). Feature-linked annotation will update when a feature attribute referenced by the annotation expression is also updated. Additionally, the position of the annotation will transform to match any transformation to the linked feature's geometry.

How to use the sample

Pan and zoom the map to see that the text on the map is annotation, not labels. Tap one of the address points to update the house number (ADADDRESS) and street name (STSTR_NAM). Tap one of the dashed parcel polylines and tap another location to change its geometry. NOTE: Selection is only enabled for points and straight (single segment) polylines.

The feature-linked annotation will update accordingly.

How it works

  1. Load the geodatabase. NOTE: Read/write geodatabases should normally come from a GeodatabaseSyncTask, but this has been omitted here. That functionality is covered in the sample Generate geodatabase.
  2. Create FeatureLayers from geodatabase feature tables found in the geodatabase with Geodatabase.geodatabaseFeatureTablesByTableName.
  3. Create AnnotationLayers from geodatabase feature tables found in the geodatabase with Geodatabase.geodatabaseAnnotationTablesByTableName.
  4. Add the feature layers and annotation layers to the map's operational layers.
  5. Connect to MapView.mouseClicked to capture clicks on the map to either select address points or parcel polyline features. NOTE: Selection is only enabled for points and straight (single segment) polylines.

    • For the address points, a dialog will opened to allow editing of the address number (ADADDRESS) and street name (STSTR_NAM) attributes. A second tap will change the location of the point.
    • For the parcel lines, a second tap will change one of the polyline's vertices.

Both expressions were defined by the data author in ArcGIS Pro using the Arcade expression language.

Relevant API

  • AnnotationLayer
  • Feature
  • FeatureLayer
  • Geodatabase

Offline data

Link Local Location
Loudoun geodatabase <userhome>/ArcGIS/Runtime/Data/geodatabase/loudoun_anno.geodatabase

About the data

This sample uses data derived from the Loudoun GeoHub.

The annotation linked to the point data in this sample is defined by arcade expression $feature.AD_ADDRESS + " " + $feature.ST_STR_NAM. The annotation linked to the parcel polyline data is defined by Round(Length(Geometry($feature), 'feet'), 2).

Tags

annotation, attributes, feature-linked annotation, features, fields

Sample Code

EditFeaturesWithFeatureLinkedAnnotation.qml
                                                                                                                                                                                                                                                                                                            
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// [WriteFile Name=EditFeaturesWithFeatureLinkedAnnotation, Category=EditData]
// [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 2.6
import QtQuick.Controls 2.2
import QtQuick.Layouts 1.3
import QtGraphicalEffects 1.0
import Esri.ArcGISRuntime 100.11
import Esri.ArcGISExtras 1.1

Rectangle {
    id: rootRectangle
    clip: true
    width: 800
    height: 600

    readonly property url dataPath: System.userHomePath + "/ArcGIS/Runtime/Data"
    readonly property string pointsFeatureLayerName: "Loudoun_Address_Points_1"
    readonly property string pointsAnnoLayerName: "Loudoun_Address_PointsAnno_1"
    readonly property string linesFeatureLayerName: "ParcelLines_1"
    readonly property string linesAnnoLayerName: "ParcelLinesAnno_1"
    readonly property string ad_address: "AD_ADDRESS"
    readonly property string st_str_nam: "ST_STR_NAM"
    property var selectedFeature: null
    property var pointsFeatureLayer: null
    property var linesFeatureLayer: null
    property string streetNameText: ""
    property string addressText: ""

    MapView {
        id: mapView
        anchors.fill: parent

        Map {
            id: map
            Basemap {
                initStyle: Enums.BasemapStyleArcGISLightGray
            }

            initialViewpoint: viewpoint
        }

        onMouseClicked: {
            const clickPoint = mapView.screenToLocation(mouse.x, mouse.y);

            if (updateWindow.visible)
                updateWindow.visible = false;

            if (selectedFeature) {
                moveFeature(clickPoint);
            } else {
                mapView.identifyLayers(mouse.x, mouse.y, 10, false);
            }
        }

        onIdentifyLayersStatusChanged: {
            if (mapView.identifyLayersStatus !== Enums.TaskStatusCompleted)
                return;

            const results = mapView.identifyLayersResults;

            for (let i = 0; i < results.length; i++) {

                const layerContent = identifyLayersResults[i].layerContent;

                // only select features if the layer content is a Feature Layer
                if (layerContent.name === pointsFeatureLayerName || layerContent.name === linesFeatureLayerName) {

                    selectedFeature = results[i].geoElements[0];
                    const geometry = selectedFeature.geometry;

                    if (geometry.geometryType === Enums.GeometryTypePoint) {

                        // update QML text fields with the attributes for the selected point feature
                        addressText = selectedFeature.attributes.attributeValue(ad_address);
                        streetNameText = selectedFeature.attributes.attributeValue(st_str_nam);
                        pointsFeatureLayer.selectFeature(selectedFeature);
                        updateWindow.visible = true;
                    } else if (geometry.geometryType === Enums.GeometryTypePolyline ) {

                        const polylineBuilder = ArcGISRuntimeEnvironment.createObject("PolylineBuilder", {
                                                                                          geometry: geometry,
                                                                                          spatialReference: Factory.SpatialReference.createWgs84()
                                                                                      });

                        // if the selected feature is a polyline with any part containing more than one segment
                        // (i.e. a curve) do not select it
                        if (polylineBuilder.parts.part(0).segmentCount > 1) {
                            clearSelection();
                            return;
                        }
                        linesFeatureLayer.selectFeature(selectedFeature);
                        return;
                    }
                }
            }
        }
    }

    // Create the initial Viewpoint
    ViewpointCenter {
        id: viewpoint
        // Specify the center Point
        center: Point {
            x: -77.41589
            y: 39.0204
            spatialReference: SpatialReference { wkid: 4326 }
        }
        // Specify the scale
        targetScale: 2257
    }

    Geodatabase {
        id: geodatabase
        path: dataPath + "/geodatabase/loudoun_anno.geodatabase"

        onLoadStatusChanged: {
            if (Enums.LoadStatusLoaded !== geodatabase.loadStatus)
                return;

            // create feature layers from tables in the geodatabase
            const pointFeatureTable = geodatabase.geodatabaseFeatureTablesByTableName[pointsFeatureLayerName];
            pointsFeatureLayer = ArcGISRuntimeEnvironment.createObject("FeatureLayer", {
                                                                           featureTable: pointFeatureTable
                                                                       });
            map.operationalLayers.append(pointsFeatureLayer);

            const linesFeatureTable = geodatabase.geodatabaseFeatureTablesByTableName[linesFeatureLayerName];
            linesFeatureLayer = ArcGISRuntimeEnvironment.createObject("FeatureLayer", {
                                                                          featureTable: linesFeatureTable
                                                                      });
            map.operationalLayers.append(linesFeatureLayer);

            // create annotation layers from tables in the geodatabase
            const pointAnnoFeatureTable = geodatabase.geodatabaseAnnotationTablesByTableName[pointsAnnoLayerName];
            const pointAnnoFeatureLayer = ArcGISRuntimeEnvironment.createObject("AnnotationLayer", {
                                                                                    featureTable: pointAnnoFeatureTable
                                                                                });
            map.operationalLayers.append(pointAnnoFeatureLayer);

            const linesAnnoFeatureTable = geodatabase.geodatabaseAnnotationTablesByTableName[linesAnnoLayerName];
            const linesAnnoFeatureLayer = ArcGISRuntimeEnvironment.createObject("AnnotationLayer", {
                                                                                    featureTable: linesAnnoFeatureTable
                                                                                });
            map.operationalLayers.append(linesAnnoFeatureLayer);
        }
    }

    QueryParameters {
        id: params
    }

    // Update Window
    Rectangle {
        id: updateWindow
        anchors.centerIn: parent
        width: childrenRect.width
        height: childrenRect.height
        radius: 10
        visible: false

        GaussianBlur {
            anchors.fill: updateWindow
            source: mapView
            radius: 40
            samples: 20
        }

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

        GridLayout {
            columns: 2
            anchors.margins: 5

            Text {
                Layout.columnSpan: 2
                Layout.margins: 5
                Layout.alignment: Qt.AlignHCenter
                text: qsTr("Update Attributes")
                font.pixelSize: 16
            }

            Text {
                text: qsTr("AD_ADDRESS:")
                Layout.margins: 5
            }

            TextField {
                id: attAddressTextField
                selectByMouse: true
                text: addressText
            }

            Text {
                text: qsTr("ST_STR_NAM:")
                Layout.margins: 5
            }

            TextField {
                id: attStreetTextField
                text: streetNameText
                selectByMouse: true
            }

            Row {
                Layout.alignment: Qt.AlignRight
                Layout.columnSpan: 2
                height: childrenRect.height
                spacing: 5

                Button {
                    Layout.margins: 5
                    Layout.alignment: Qt.AlignRight
                    text: qsTr("Update")
                    onClicked: {
                        updateWindow.visible = false;

                        if (!selectedFeature)
                            return;

                        // update the two attributes with the inputted text.
                        selectedFeature.attributes.replaceAttribute(ad_address, attAddressTextField.text);
                        selectedFeature.attributes.replaceAttribute(st_str_nam, attStreetTextField.text);
                        selectedFeature.featureTable.updateFeature(selectedFeature);
                    }
                }

                Button {
                    Layout.alignment: Qt.AlignRight
                    Layout.margins: 5
                    text: qsTr("Cancel")
                    // once the cancel button is clicked, hide the window and reset text fields
                    onClicked: {
                        updateWindow.visible = false;
                        streetNameText = "";
                        addressText = "";
                    }
                }
            }
        }
    }

    function clearSelection() {
        pointsFeatureLayer.clearSelection();
        linesFeatureLayer.clearSelection();

        selectedFeature = null;
    }

    function moveFeature(mapPoint) {
        const geometry = selectedFeature.geometry;
        const workingPoint = GeometryEngine.project(mapPoint, geometry.spatialReference);

        if (geometry.geometryType === Enums.GeometryTypePolyline) {

            // get nearest vertex to the map point on the selected polyline
            const nearestVertex = GeometryEngine.nearestVertex(geometry, workingPoint);

            const polylineBuilder = ArcGISRuntimeEnvironment.createObject("PolylineBuilder", {
                                                                              geometry: geometry,
                                                                              spatialReference: Factory.SpatialReference.createWgs84()
                                                                          });

            // get part of polyline nearest to map point
            const part = polylineBuilder.parts.part(nearestVertex.partIndex);

            // remove nearest point to map point
            part.removePoint(nearestVertex.pointIndex);

            // add the map point as a new point
            part.addPoint(workingPoint);

            selectedFeature.geometry = polylineBuilder.geometry;
        } else if (geometry.geometryType === Enums.GeometryTypePoint) {

            // if the selected feature is a point, change the geometry with the map point
            selectedFeature.geometry = mapPoint;
        }
        // update the selected feature with the new geometry
        selectedFeature.featureTable.updateFeature(selectedFeature);
        clearSelection();
    }
}

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