Sketch on the map

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// 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.

import UIKit
import ArcGIS

class SketchViewController: UIViewController {
    @IBOutlet private weak var mapView: AGSMapView!
    @IBOutlet private weak var geometrySegmentedControl: UISegmentedControl!
    @IBOutlet private weak var undoBBI: UIBarButtonItem!
    @IBOutlet private weak var redoBBI: UIBarButtonItem!
    @IBOutlet private weak var clearBBI: UIBarButtonItem!

    private var sketchEditor: AGSSketchEditor!

    override func viewDidLoad() {
        super.viewDidLoad()

        // add the source code button item to the right of navigation bar
        (self.navigationItem.rightBarButtonItem as! SourceCodeBarButtonItem).filenames = ["SketchViewController"]

        self.sketchEditor = AGSSketchEditor()
        self.mapView.sketchEditor = self.sketchEditor

        self.sketchEditor.start(with: nil, creationMode: .polyline)

        self.mapView.map = AGSMap(basemapStyle: .arcGISLightGrayBase)
        self.mapView.interactionOptions.isMagnifierEnabled = true

        NotificationCenter.default.addObserver(self, selector: #selector(SketchViewController.respondToGeomChanged), name: .AGSSketchEditorGeometryDidChange, object: nil)

        // set viewpoint
        self.mapView.setViewpoint(AGSViewpoint(targetExtent: AGSEnvelope(xMin: -10049589.670344, yMin: 3480099.843772, xMax: -10010071.251113, yMax: 3512023.489701, spatialReference: .webMercator())))
    }

    @objc
    func respondToGeomChanged() {
        // Enable/disable UI elements appropriately
        self.undoBBI.isEnabled = self.sketchEditor.undoManager.canUndo
        self.redoBBI.isEnabled = self.sketchEditor.undoManager.canRedo
        self.clearBBI.isEnabled = self.sketchEditor.geometry != nil && !self.sketchEditor.geometry!.isEmpty
    }

    // MARK: - Actions

    @IBAction func geometryValueChanged(_ segmentedControl: UISegmentedControl) {
        switch segmentedControl.selectedSegmentIndex {
        case 0:// point
            self.sketchEditor.start(with: nil, creationMode: .point)

        case 1:// polyline
            self.sketchEditor.start(with: nil, creationMode: .polyline)

        case 2:// freehand polyline
            self.sketchEditor.start(with: nil, creationMode: .freehandPolyline)

        case 3:// polygon
            self.sketchEditor.start(with: nil, creationMode: .polygon)

        case 4:// freehand polygon
            self.sketchEditor.start(with: nil, creationMode: .freehandPolygon)

        default:
            break
        }

        self.mapView.sketchEditor = self.sketchEditor
    }

    @IBAction func undo() {
        if self.sketchEditor.undoManager.canUndo { // extra check, just to be sure
            self.sketchEditor.undoManager.undo()
        }
    }

    @IBAction func redo() {
        if self.sketchEditor.undoManager.canRedo { // extra check, just to be sure
            self.sketchEditor.undoManager.redo()
        }
    }

    @IBAction func clear() {
        self.sketchEditor.clearGeometry()
    }
}