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Add scan order functionality to ScannerScreen

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- Introduced an enum `ScanOrder` to define sorting options for scanned devices.
- Implemented logic to save and retrieve the selected scan order from shared preferences.
- Added a popup menu for users to select the sorting method (Last Seen, Name, RSSI).
- Updated the device list display to reflect the selected sorting order, enhancing user experience.
This commit is contained in:
Foti Dim
2026-02-09 21:37:44 +01:00
parent 061e0ae633
commit b49d54b900
1 changed files with 103 additions and 25 deletions
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example/lib/home/scanner_screen.dart
+98 -20
View File
@@ -15,6 +15,12 @@ import 'package:universal_ble_example/home/widgets/scanned_item_widget.dart';
import 'package:universal_ble_example/peripheral_details/peripheral_detail_page.dart';
import 'package:universal_ble_example/widgets/scan_controller_scope.dart';
enum ScanOrder {
lastSeen,
name,
rssi,
}
class ScannerScreen extends StatefulWidget {
const ScannerScreen({super.key});
@@ -37,6 +43,7 @@ class _ScannerScreenState extends State<ScannerScreen> {
AvailabilityState? bleAvailabilityState;
ScanFilter? scanFilter;
ScanOrder _scanOrder = ScanOrder.lastSeen;
final Map<String, bool> _isExpanded = {};
final Map<String, int> _deviceAdFlashTrigger = {};
@@ -108,6 +115,7 @@ class _ScannerScreenState extends State<ScannerScreen> {
prefs.getString('scan_filter_manufacturer_data') ?? '';
final searchFilter = prefs.getString('scan_filter_search') ?? '';
final webServices = prefs.getString('scan_filter_web_services') ?? '';
final scanOrderStr = prefs.getString('scan_order');
servicesFilterController.text = services;
namePrefixController.text = namePrefix;
@@ -115,6 +123,21 @@ class _ScannerScreenState extends State<ScannerScreen> {
_searchFilterController.text = searchFilter;
_webServicesController.text = webServices;
if (scanOrderStr != null) {
switch (scanOrderStr) {
case 'lastSeen':
_scanOrder = ScanOrder.lastSeen;
break;
case 'name':
_scanOrder = ScanOrder.name;
break;
case 'rssi':
_scanOrder = ScanOrder.rssi;
break;
}
if (mounted) setState(() {});
}
// Reconstruct the scan filter if any values exist
if (services.isNotEmpty ||
namePrefix.isNotEmpty ||
@@ -139,6 +162,7 @@ class _ScannerScreenState extends State<ScannerScreen> {
await prefs.setString('scan_filter_search', _searchFilterController.text);
await prefs.setString(
'scan_filter_web_services', _webServicesController.text);
await prefs.setString('scan_order', _scanOrder.name);
} catch (e) {
debugPrint('Failed to save scan filters: $e');
}
@@ -302,6 +326,37 @@ class _ScannerScreenState extends State<ScannerScreen> {
}).toList();
}
List<BleDevice> get _sortedDevices {
final list = List<BleDevice>.from(_filteredDevices);
switch (_scanOrder) {
case ScanOrder.lastSeen:
list.sort((a, b) {
final ta = a.timestamp ?? 0;
final tb = b.timestamp ?? 0;
return tb.compareTo(ta); // newest first
});
break;
case ScanOrder.name:
list.sort((a, b) {
final na = (a.name ?? '').toLowerCase();
final nb = (b.name ?? '').toLowerCase();
if (na.isEmpty && nb.isEmpty) return 0;
if (na.isEmpty) return 1;
if (nb.isEmpty) return -1;
return na.compareTo(nb);
});
break;
case ScanOrder.rssi:
list.sort((a, b) {
final ra = a.rssi ?? -999;
final rb = b.rssi ?? -999;
return rb.compareTo(ra); // strongest first
});
break;
}
return list;
}
bool get _isBluetoothAvailable =>
bleAvailabilityState == AvailabilityState.poweredOn;
@@ -623,7 +678,7 @@ class _ScannerScreenState extends State<ScannerScreen> {
),
),
),
const Spacer(),
const SizedBox(width: 4),
TextButton.icon(
onPressed: _showScanFilterBottomSheet,
icon: Icon(
@@ -652,30 +707,54 @@ class _ScannerScreenState extends State<ScannerScreen> {
: null,
),
),
const SizedBox(width: 4),
TextButton.icon(
onPressed: () {
const Spacer(),
PopupMenuButton<ScanOrder>(
tooltip: 'Sort by',
padding: EdgeInsets.zero,
onSelected: (ScanOrder order) {
setState(() {
_bleDevices.clear();
_hiddenDevices.clear();
_deviceAdFlashTrigger.clear();
_scanOrder = order;
});
_saveScanFilters();
},
icon: Icon(
Icons.clear_all,
size: 18,
color: colorScheme.error,
itemBuilder: (context) => [
const PopupMenuItem(
value: ScanOrder.lastSeen,
child: Text('Last seen'),
),
label: Text(
'Clear',
const PopupMenuItem(
value: ScanOrder.name,
child: Text('Name'),
),
const PopupMenuItem(
value: ScanOrder.rssi,
child: Text('RSSI'),
),
],
child: Padding(
padding: const EdgeInsets.symmetric(horizontal: 8),
child: Row(
mainAxisSize: MainAxisSize.min,
children: [
Text(
_scanOrder == ScanOrder.lastSeen
? 'Last seen'
: _scanOrder == ScanOrder.name
? 'Name'
: 'RSSI',
style: TextStyle(
color: colorScheme.error,
color: colorScheme.onSurface,
fontSize: 12,
fontWeight: FontWeight.w600,
),
),
style: TextButton.styleFrom(
padding: EdgeInsets.symmetric(horizontal: 8),
Icon(
Icons.arrow_drop_down,
size: 18,
color: colorScheme.onSurface,
),
],
),
),
),
],
@@ -789,7 +868,7 @@ class _ScannerScreenState extends State<ScannerScreen> {
)
: _scanController?.isScanning != true && _bleDevices.isEmpty
? ScannedDevicesPlaceholderWidget(onTap: _startScan)
: _filteredDevices.isEmpty
: _sortedDevices.isEmpty
? Center(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
@@ -817,12 +896,11 @@ class _ScannerScreenState extends State<ScannerScreen> {
horizontal: 16,
vertical: 8,
),
itemCount: _filteredDevices.length,
itemCount: _sortedDevices.length,
separatorBuilder: (context, index) =>
const SizedBox(height: 8),
itemBuilder: (context, index) {
BleDevice device = _filteredDevices[
_filteredDevices.length - index - 1];
BleDevice device = _sortedDevices[index];
return ScannedItemWidget(
bleDevice: device,
adFlashTrigger: