52 lines
1.6 KiB
Dart
52 lines
1.6 KiB
Dart
import 'dart:async';
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import 'package:aves/model/entry/entry.dart';
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import 'package:aves/widgets/viewer/multipage/controller.dart';
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import 'package:collection/collection.dart';
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import 'package:flutter/foundation.dart';
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class MultiPageConductor {
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final List<MultiPageController> _controllers = [];
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static const maxControllerCount = 3;
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MultiPageConductor() {
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if (kFlutterMemoryAllocationsEnabled) {
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FlutterMemoryAllocations.instance.dispatchObjectCreated(
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library: 'aves',
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className: '$MultiPageConductor',
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object: this,
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);
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}
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}
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Future<void> dispose() async {
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if (kFlutterMemoryAllocationsEnabled) {
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FlutterMemoryAllocations.instance.dispatchObjectDisposed(object: this);
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}
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await _disposeAll();
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_controllers.clear();
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}
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MultiPageController getOrCreateController(AvesEntry entry) {
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var controller = getController(entry);
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if (controller != null) {
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_controllers.remove(controller);
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} else {
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controller = MultiPageController(entry);
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}
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_controllers.insert(0, controller);
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while (_controllers.length > maxControllerCount) {
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_controllers.removeLast().dispose();
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}
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return controller;
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}
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MultiPageController? getController(AvesEntry entry) {
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return _controllers.firstWhereOrNull((c) => c.entry.uri == entry.uri && c.entry.pageId == entry.pageId);
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}
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Future<void> _applyToAll(FutureOr Function(MultiPageController controller) action) => Future.forEach<MultiPageController>(_controllers, action);
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Future<void> _disposeAll() => _applyToAll((controller) => controller.dispose());
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}
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