Group layers together

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// Copyright 2024 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 'package:arcgis_maps/arcgis_maps.dart';
import 'package:arcgis_maps_sdk_flutter_samples/common/common.dart';
import 'package:flutter/material.dart';

class GroupLayersTogether extends StatefulWidget {
  const GroupLayersTogether({super.key});

  @override
  State<GroupLayersTogether> createState() => _GroupLayersTogetherState();
}

class _GroupLayersTogetherState extends State<GroupLayersTogether>
    with SampleStateSupport {
  // Create a controller for the scene view.
  final _sceneViewController = ArcGISSceneView.createController();
  // A flag for when the scene view is ready and controls can be used.
  var _ready = false;
  // A flag for when the settings bottom sheet is visible.
  var _settingsVisible = false;

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: SafeArea(
        top: false,
        left: false,
        right: false,
        child: Stack(
          children: [
            Column(
              children: [
                Expanded(
                  // Add a scene view to the widget tree and set a controller.
                  child: ArcGISSceneView(
                    controllerProvider: () => _sceneViewController,
                    onSceneViewReady: onSceneViewReady,
                  ),
                ),
                Row(
                  mainAxisAlignment: MainAxisAlignment.spaceEvenly,
                  children: [
                    // A button to show the Settings bottom sheet.
                    ElevatedButton(
                      onPressed: () => setState(() => _settingsVisible = true),
                      child: const Text('Settings'),
                    ),
                  ],
                ),
              ],
            ),
            // Display a progress indicator and prevent interaction until state is ready.
            LoadingIndicator(visible: !_ready),
          ],
        ),
      ),
      // The Settings bottom sheet.
      bottomSheet: _settingsVisible ? buildSettings(context) : null,
    );
  }

  // The build method for the Settings bottom sheet.
  Widget buildSettings(BuildContext context) {
    return BottomSheetSettings(
      onCloseIconPressed: () => setState(() => _settingsVisible = false),
      settingsWidgets: (context) => [
        Container(
          constraints: BoxConstraints(
            maxHeight: MediaQuery.sizeOf(context).height * 0.4,
          ),
          child: SingleChildScrollView(
            child: Column(
              crossAxisAlignment: CrossAxisAlignment.stretch,
              children:
                  _sceneViewController.arcGISScene?.operationalLayers
                      .whereType<GroupLayer>()
                      .map(buildGroupLayerSettings)
                      .toList() ??
                  [],
            ),
          ),
        ),
      ],
    );
  }

  // Create Widgets to control the Group Layer and its layers.
  Widget buildGroupLayerSettings(GroupLayer groupLayer) {
    return Column(
      crossAxisAlignment: CrossAxisAlignment.stretch,
      children: [
        Row(
          children: [
            Text(
              groupLayer.name,
              style: Theme.of(context).textTheme.titleMedium,
            ),
            const Spacer(),
            // Create a Switch to toggle the visibility of the Group Layer.
            Switch(
              value: groupLayer.isVisible,
              onChanged: (value) {
                groupLayer.isVisible = value;
                setState(() {});
              },
            ),
          ],
        ),
        // Create a list of Switches to toggle the visibility of the individual layers.
        ...groupLayer.layers.map((layer) {
          return Row(
            children: [
              Text(layer.name),
              const Spacer(),
              // Create a Switch to toggle the visibility of the individual layer.
              Switch(
                value: layer.isVisible,
                onChanged: groupLayer.isVisible
                    ? (value) {
                        layer.isVisible = value;
                        setState(() {});
                      }
                    : null,
              ),
            ],
          );
        }),
      ],
    );
  }

  Future<void> onSceneViewReady() async {
    // Create a Group Layer for the Project Area Group.
    final projectAreaGroupLayer = GroupLayer()..name = 'Project Area Group';
    // Create a Feature Layer for the Project Area.
    final projectAreaTable = ServiceFeatureTable.withUri(
      Uri.parse(
        'https://services.arcgis.com/P3ePLMYs2RVChkJx/arcgis/rest/services/DevelopmentProjectArea/FeatureServer/0',
      ),
    );
    final projectAreaLayer = FeatureLayer.withFeatureTable(projectAreaTable)
      ..name = 'Project Area';
    // Create a Feature Layer for the Pathways.
    final pathwaysTable = ServiceFeatureTable.withUri(
      Uri.parse(
        'https://services.arcgis.com/P3ePLMYs2RVChkJx/arcgis/rest/services/DevA_Pathways/FeatureServer/1',
      ),
    );
    final pathwaysLayer = FeatureLayer.withFeatureTable(pathwaysTable)
      ..name = 'Pathways';
    // Create a Scene Layer for the Trees.
    final treesLayer = ArcGISSceneLayer.withUri(
      Uri.parse(
        'https://tiles.arcgis.com/tiles/P3ePLMYs2RVChkJx/arcgis/rest/services/DevA_Trees/SceneServer/layers/0',
      ),
    )..name = 'Trees';
    // Add the layers to the Group Layer.
    projectAreaGroupLayer.layers.addAll([
      projectAreaLayer,
      pathwaysLayer,
      treesLayer,
    ]);

    // Create a Group Layer for the Buildings Group with "exclusive" visibility.
    final buildingsGroupLayer = GroupLayer()
      ..name = 'Buildings Group'
      ..visibilityMode = GroupVisibilityMode.exclusive;
    // Create a Scene Layer for the Dev A buildings.
    final buildingsALayer = ArcGISSceneLayer.withUri(
      Uri.parse(
        'https://tiles.arcgis.com/tiles/P3ePLMYs2RVChkJx/arcgis/rest/services/DevA_BuildingShells/SceneServer/layers/0',
      ),
    )..name = 'Dev A';
    // Create a Scene Layer for the Dev B buildings.
    final buildingsBLayer = ArcGISSceneLayer.withUri(
      Uri.parse(
        'https://tiles.arcgis.com/tiles/P3ePLMYs2RVChkJx/arcgis/rest/services/DevB_BuildingShells/SceneServer/layers/0',
      ),
    )..name = 'Dev B';
    buildingsGroupLayer.layers.addAll([buildingsALayer, buildingsBLayer]);

    // Create a scene with the ArcGIS Imagery basemap style.
    final scene = ArcGISScene.withBasemapStyle(BasemapStyle.arcGISImagery);
    // Add the Group Layers to the scene.
    scene.operationalLayers.addAll([
      projectAreaGroupLayer,
      buildingsGroupLayer,
    ]);
    // Set the scene to the scene view.
    _sceneViewController.arcGISScene = scene;

    // Load the project area layer to get its extent.
    await projectAreaLayer.load();
    // Set the initial viewpoint centered on the extent of the project area layer.
    if (projectAreaLayer.fullExtent != null) {
      _sceneViewController.setViewpointCamera(
        Camera.withLookAtPoint(
          lookAtPoint: projectAreaLayer.fullExtent!.center,
          distance: 800,
          heading: 0,
          pitch: 60,
          roll: 0,
        ),
      );
    }

    // Set the ready state variable to true to enable the UI.
    setState(() => _ready = true);
  }
}