41 lines
1.3 KiB
Dart
41 lines
1.3 KiB
Dart
import 'dart:typed_data';
|
|
import 'package:flutter_riverpod/flutter_riverpod.dart';
|
|
|
|
/// A simple library of signature images available to the user in the sidebar.
|
|
class SignatureAsset {
|
|
final String id; // unique id
|
|
final Uint8List bytes;
|
|
final String? name; // optional display name (e.g., filename)
|
|
const SignatureAsset({required this.id, required this.bytes, this.name});
|
|
}
|
|
|
|
class SignatureLibraryController extends StateNotifier<List<SignatureAsset>> {
|
|
SignatureLibraryController() : super(const []);
|
|
|
|
String add(Uint8List bytes, {String? name}) {
|
|
// Always add a new asset (allow duplicates). This lets users create multiple cards
|
|
// even when loading the same image repeatedly for different adjustments/usages.
|
|
if (bytes.isEmpty) return '';
|
|
final id = DateTime.now().microsecondsSinceEpoch.toString();
|
|
state = List.of(state)
|
|
..add(SignatureAsset(id: id, bytes: bytes, name: name));
|
|
return id;
|
|
}
|
|
|
|
void remove(String id) {
|
|
state = state.where((a) => a.id != id).toList(growable: false);
|
|
}
|
|
|
|
SignatureAsset? byId(String id) {
|
|
for (final a in state) {
|
|
if (a.id == id) return a;
|
|
}
|
|
return null;
|
|
}
|
|
}
|
|
|
|
final signatureLibraryProvider =
|
|
StateNotifierProvider<SignatureLibraryController, List<SignatureAsset>>(
|
|
(ref) => SignatureLibraryController(),
|
|
);
|