Custom dictionary style

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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: 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 ArcGIS.Samples.Managers;
using Esri.ArcGISRuntime.Mapping;
using Esri.ArcGISRuntime.Portal;
using Esri.ArcGISRuntime.Symbology;

namespace ArcGIS.Samples.CustomDictionaryStyle
{
    [ArcGIS.Samples.Shared.Attributes.Sample(
        name: "Custom dictionary style",
        category: "Symbology",
        description: "Use a custom dictionary created from a web style or style file (.stylx) to symbolize features using a variety of attribute values.",
        instructions: "Use the radio buttons to toggle between the dictionary symbols from the web style and style file. Pan and zoom around the map to see the symbology from the chosen dictionary symbol style. The web style and style file are slightly different to each other to give a visual indication of the switch between the two.",
        tags: new[] { "ArcGIS Online", "dictionary", "military", "renderer", "style", "stylx", "unique value", "visualization", "web style" })]
    [ArcGIS.Samples.Shared.Attributes.OfflineData("751138a2e0844e06853522d54103222a")]
    public partial class CustomDictionaryStyle : ContentPage
    {
        // Path for the restaurants style file.
        private readonly string _stylxPath = DataManager.GetDataFolder("751138a2e0844e06853522d54103222a", "Restaurant.stylx");

        // Uri for the restaurants feature service.
        private readonly Uri _restaurantUri = new Uri("https://services2.arcgis.com/ZQgQTuoyBrtmoGdP/arcgis/rest/services/Redlands_Restaurants/FeatureServer/0");

        // Hold a reference to the renderers for use in the event handlers.
        private DictionaryRenderer _localStyleDictionaryRenderer;
        private DictionaryRenderer _dictionaryRendererFromPortal;

        // Hold a reference to the feature layer for use in the event handlers.
        private FeatureLayer _restaurantLayer;

        public CustomDictionaryStyle()
        {
            InitializeComponent();
            _ = Initialize();
        }

        private async Task Initialize()
        {
            try
            {
                // Create a new map with a topographic basemap.
                Map map = new Map(BasemapStyle.ArcGISTopographic);

                // Create the restaurants layer and add it to the map.
                _restaurantLayer = new FeatureLayer(_restaurantUri);
                map.OperationalLayers.Add(_restaurantLayer);

                // Load the feature table for the restaurants layer.
                await _restaurantLayer.FeatureTable.LoadAsync();

                // Set the map's initial extent to that of the restaurants.
                map.InitialViewpoint = new Viewpoint(_restaurantLayer.FullExtent);

                // Set the map to the map view.
                MyMapView.Map = map;

                // Load the local style renderer.
                await LoadLocalStyle();

                // Load the portal style renderer.
                await LoadWebStyle();

                // Set the local style radio button to be checked.
                LocalStyleButton.IsChecked = true;
            }
            catch (Exception ex)
            {
                await Application.Current.MainPage.DisplayAlert("Error", ex.Message, "OK");
            }
        }

        private async Task LoadLocalStyle()
        {
            // Open the local custom style file.
            DictionarySymbolStyle localRestaurantStyle = await DictionarySymbolStyle.CreateFromFileAsync(_stylxPath);

            // Create the dictionary renderer with the style file and the field overrides.
            _localStyleDictionaryRenderer = new DictionaryRenderer(localRestaurantStyle);
        }

        private async Task LoadWebStyle()
        {
            // Open a portal item containing a dictionary symbol style.
            ArcGISPortal portal = await ArcGISPortal.CreateAsync();
            PortalItem portalItem = await PortalItem.CreateAsync(portal, "adee951477014ec68d7cf0ea0579c800");

            // Open the portal custom style file.
            DictionarySymbolStyle restaurantStyleFromPortal = await DictionarySymbolStyle.OpenAsync(portalItem);

            // Create the dictionary renderer with the style file and the field overrides.
            _dictionaryRendererFromPortal = new DictionaryRenderer(restaurantStyleFromPortal);
        }

        private void LocalStyleButtonClicked(object sender, EventArgs e)
        {
            if (LocalStyleButton.IsChecked)
            {
                // Set the restaurant layer renderer to the dictionary renderer.
                _restaurantLayer.Renderer = _localStyleDictionaryRenderer;
            }
        }

        private void WebStyleButtonClicked(object sender, EventArgs e)
        {
            if (WebStyleButton.IsChecked)
            {
                // Set the restaurant layer renderer to the dictionary renderer.
                _restaurantLayer.Renderer = _dictionaryRendererFromPortal;
            }
        }
    }
}