Show magnifier

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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.

using Android.App;
using Android.OS;
using Android.Widget;
using Esri.ArcGISRuntime.Mapping;
using Esri.ArcGISRuntime.UI.Controls;

namespace ArcGISRuntime.Samples.ShowMagnifier
{
    [Activity (ConfigurationChanges=Android.Content.PM.ConfigChanges.Orientation | Android.Content.PM.ConfigChanges.ScreenSize)]
    [ArcGISRuntime.Samples.Shared.Attributes.Sample(
        name: "Show magnifier",
        category: "MapView",
        description: "Tap and hold on a map to show a magnifier.",
        instructions: "Tap and hold on the map to show a magnifier, then drag across the map to move the magnifier. You can also pan the map while holding the magnifier, by dragging the magnifier to the edge of the map.",
        tags: new[] { "magnify", "map", "zoom" })]
    public class ShowMagnifier : Activity
    {
        // Hold a reference to the map view
        private MapView _myMapView;

        protected override void OnCreate(Bundle bundle)
        {
            base.OnCreate(bundle);

            Title = "Show magnifier";

            // Create the UI, setup the control references and execute initialization
            CreateLayout();
            Initialize();
        }

        private void Initialize()
        {
            // Create new Map with basemap and initial location
            Map myMap = new Map(BasemapStyle.ArcGISTopographic);
            myMap.InitialViewpoint = new Viewpoint(34.056295, -117.195800, 50000);

            // Enable the ability to interact with the map view (including enabling the magnifier)
            _myMapView.InteractionOptions = new Esri.ArcGISRuntime.UI.MapViewInteractionOptions
            {
                // Enable magnifier
                IsMagnifierEnabled = true
            };

            // Assign the map to the MapView
            _myMapView.Map = myMap;
        }

        private void CreateLayout()
        {
            // Create a new vertical layout for the app
            LinearLayout layout = new LinearLayout(this) { Orientation = Orientation.Vertical };

            // Create and add a help label
            TextView helpLabel = new TextView(this)
            {
                Text = "Tap and hold to show the magnifier. Note: This only works on touchscreen devices."
            };
            layout.AddView(helpLabel);

            // Add the map view to the layout
            _myMapView = new MapView(this);
            layout.AddView(_myMapView);

            // Show the layout in the app
            SetContentView(layout);
        }
    }
}