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lib/BlindMasterScreens/addingDevices/add_device.dart

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+import 'dart:async';
+
+import 'package:blind_master/BlindMasterResources/error_snackbar.dart';
+import 'package:blind_master/BlindMasterScreens/addingDevices/device_setup.dart';
+import 'package:blind_master/utils_from_FBPExample/extra.dart';
+import 'package:blind_master/utils_from_FBPExample/scan_result_tile.dart';
+import 'package:flutter/material.dart';
+import 'package:flutter_blue_plus/flutter_blue_plus.dart';
+import 'package:google_fonts/google_fonts.dart';
+
+class AddDevice extends StatefulWidget {
+  const AddDevice({super.key});
+
+  @override
+  State<AddDevice> createState() => _AddDeviceState();
+}
+
+class _AddDeviceState extends State<AddDevice> {
+  List<ScanResult> _scanResults = [];
+  bool _isScanning = false;
+
+  late StreamSubscription<List<ScanResult>> _scanResultsSubscription;
+  late StreamSubscription<bool> _isScanningSubscription;
+
+  BluetoothAdapterState _adapterState = BluetoothAdapterState.unknown;
+  late StreamSubscription<BluetoothAdapterState> _adapterStateSubscription;
+  bool _isConnecting = false;
+  
+  @override
+  void initState() {
+    super.initState();
+    initBluetoothandStartScan();
+  }
+
+  @override
+  void dispose() {
+    _scanResultsSubscription.cancel();
+    _isScanningSubscription.cancel();
+    _adapterStateSubscription.cancel();
+    super.dispose();
+  }
+
+  Future<void> _startScan() async {
+    try {
+      await FlutterBluePlus.startScan(
+        timeout: const Duration(seconds: 15),
+        withServices: [
+          Guid("181C"),
+        ],
+        webOptionalServices: [
+          Guid("181C"), // user input
+        ],
+      );
+    } catch (e, backtrace) {
+      if (!mounted) return;
+      ScaffoldMessenger.of(context).showSnackBar(errorSnackbar(e));
+      print("backtrace: $backtrace");
+    }
+    setState(() {});
+  }
+
+
+  Future<void> initBluetoothandStartScan() async {
+
+    _adapterStateSubscription = FlutterBluePlus.adapterState.listen((state) {
+      if (mounted) {
+        setState(() => _adapterState = state);
+        if (state == BluetoothAdapterState.on) {
+          _startScan();
+        }
+      }
+    });
+
+    _scanResultsSubscription = FlutterBluePlus.scanResults.listen((results) {
+      if (mounted) {
+        setState(() => _scanResults = results);
+        // setState(() => _scanResults = results.where((r) => r.device.platformName == "BlindMaster").toList());
+      }
+    }, onError: (e) {
+      if (!mounted) return;
+      ScaffoldMessenger.of(context).showSnackBar(
+        errorSnackbar(e)
+      );
+    });
+
+    _isScanningSubscription = FlutterBluePlus.isScanning.listen((state) {
+      if (mounted) {
+        setState(() => _isScanning = state);
+      }
+    });
+  }
+
+  Future onConnectPressed(BluetoothDevice device) async {
+    if (_isConnecting) return;
+    _isConnecting = true;
+    
+    await device.connectAndUpdateStream().catchError((e) {
+      if(!mounted) return;
+      ScaffoldMessenger.of(context).showSnackBar(errorSnackbar(e));
+    });
+    
+    if (!mounted) return;
+    Navigator.push(
+      context,
+      MaterialPageRoute(builder: (context) => DeviceSetup(device: device))
+    ).then((_) {
+      device.disconnectAndUpdateStream().catchError((e) {
+        if (!mounted) return;
+        ScaffoldMessenger.of(context).showSnackBar(errorSnackbar(e));
+      });
+      _isConnecting = false;
+    });
+  }
+
+  Future onRefresh() async {
+    if (_isScanning == false) {
+      await _startScan();
+    }
+    if (mounted) {
+      setState(() {});
+    }
+    return Future.delayed(Duration(milliseconds: 500));
+  }
+
+  Widget _buildScanResultTiles() {
+    final res = _scanResults.where((r) => r.advertisementData.advName == "BlindMaster Device" && r.rssi > -55);
+    return (res.isNotEmpty) 
+    ? ListView(
+        children: [
+          ...res.map((r) => ScanResultTile(result: r, onTap: () => onConnectPressed(r.device)))
+        ],
+      )
+    : _isScanning ? Center(
+      child: Column(
+        mainAxisAlignment: MainAxisAlignment.center,
+        children: [
+          CircularProgressIndicator(
+            color: Theme.of(context).primaryColorLight,
+          ),
+          SizedBox(
+            height: 10,
+          ),
+          Text(
+            "Nothing Yet...",
+          )
+        ]
+      ),
+    )
+    : SingleChildScrollView(
+      physics: const AlwaysScrollableScrollPhysics(),
+      child: SizedBox(
+        height: MediaQuery.of(context).size.height * 0.6,
+        child: const Center(
+          child: Text(
+            "No BlindMaster devices found nearby",
+            textAlign: TextAlign.center,
+            style: TextStyle(fontSize: 16),
+          ),
+        ),
+      ),
+    );
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      appBar: AppBar(
+        title: Text(
+          "Add a Device",
+          style: GoogleFonts.aBeeZee(),
+        ),
+        backgroundColor: Theme.of(context).primaryColorLight,
+      ),
+      body:  _adapterState != BluetoothAdapterState.on
+        ? SizedBox(
+            height: MediaQuery.of(context).size.height * 0.6,
+            child: const Center(
+              child: Text(
+                "Bluetooth is off.\nPlease turn it on to scan for devices.",
+                textAlign: TextAlign.center,
+                style: TextStyle(fontSize: 16),
+              ),
+            )
+          )
+        : RefreshIndicator(
+          onRefresh: onRefresh,
+          child: _buildScanResultTiles()
+        ),
+    );
+  }
+}