Search with geocode

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// Copyright 2022 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
//
//   https://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.

import ArcGIS
import ArcGISToolkit
import SwiftUI

struct SearchWithGeocodeView: View {
    /// The viewpoint used by the search view to pan/zoom the map to the extent
    /// of the search results.
    @State private var viewpoint: Viewpoint? = Viewpoint(
        center: Point(
            x: -93.258133,
            y: 44.986656,
            spatialReference: .wgs84
        ),
        scale: 1e6
    )

    /// Denotes whether the map view is navigating. Used for the repeat search
    /// behavior.
    @State private var isGeoViewNavigating = false

    /// The current map view extent. Used to allow repeat searches after
    /// panning/zooming the map.
    @State private var geoViewExtent: Envelope?

    /// The center for the search.
    @State private var queryCenter: Point?

    /// The screen point to perform an identify operation.
    @State private var identifyScreenPoint: CGPoint?

    /// The tap location to perform an identify operation.
    @State private var identifyTapLocation: Point?

    /// The placement for a graphic callout.
    @State private var calloutPlacement: CalloutPlacement?

    /// Provides search behavior customization.
    @ObservedObject private var locatorDataSource = LocatorSearchSource(
        name: "My Locator",
        maximumResults: 10,
        maximumSuggestions: 5
    )

    /// The view model for the sample.
    @StateObject private var model = Model()

    var body: some View {
        MapViewReader { proxy in
            MapView(
                map: model.map,
                viewpoint: viewpoint,
                graphicsOverlays: [model.searchResultsOverlay]
            )
            .onSingleTapGesture { screenPoint, tapLocation in
                identifyScreenPoint = screenPoint
                identifyTapLocation = tapLocation
            }
            .onNavigatingChanged { isGeoViewNavigating = $0 }
            .onViewpointChanged(kind: .centerAndScale) {
                queryCenter = $0.targetGeometry.extent.center
            }
            .onVisibleAreaChanged { newVisibleArea in
                // For "Repeat Search Here" behavior, use `geoViewExtent` and
                // `isGeoViewNavigating` modifiers on the search view.
                geoViewExtent = newVisibleArea.extent
            }
            .callout(placement: $calloutPlacement.animation()) { placement in
                // Show the address of user tapped location graphic.
                // To get the fully geocoded address, use "Place_addr".
                Text(placement.geoElement?.attributes["Match_addr"] as? String ?? "Unknown Address")
                    .padding()
            }
            .task(id: identifyScreenPoint) {
                guard let screenPoint = identifyScreenPoint,
                      // Identifies when user taps a graphic.
                      let identifyResult = try? await proxy.identify(
                        on: model.searchResultsOverlay,
                        screenPoint: screenPoint,
                        tolerance: 10
                      )
                else {
                    return
                }
                // Creates a callout placement at the user tapped location.
                calloutPlacement = identifyResult.graphics.first.flatMap { graphic in
                    CalloutPlacement.geoElement(graphic, tapLocation: identifyTapLocation)
                }
                identifyScreenPoint = nil
                identifyTapLocation = nil
            }
            .overlay {
                SearchView(
                    sources: [locatorDataSource],
                    viewpoint: $viewpoint
                )
                .resultsOverlay(model.searchResultsOverlay)
                .queryCenter($queryCenter)
                .geoViewExtent($geoViewExtent)
                .isGeoViewNavigating($isGeoViewNavigating)
                .onQueryChanged { query in
                    if query.isEmpty {
                        // Hides the callout when query is cleared.
                        calloutPlacement = nil
                    }
                }
                .padding()
            }
        }
    }
}

private extension SearchWithGeocodeView {
    /// The model used to store the geo model and other expensive objects
    /// used in this view.
    class Model: ObservableObject {
        /// A map with imagery basemap.
        let map = Map(basemapStyle: .arcGISImagery)

        /// The graphics overlay used by the search toolkit component to display
        /// search results on the map.
        let searchResultsOverlay = GraphicsOverlay()
    }
}

#Preview {
    SearchWithGeocodeView()
}