60 lines
2 KiB
Dart
60 lines
2 KiB
Dart
import 'package:aves/model/entry.dart';
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import 'package:aves_magnifier/aves_magnifier.dart';
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import 'package:aves/widgets/viewer/visual/state.dart';
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import 'package:collection/collection.dart';
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import 'package:flutter/foundation.dart';
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import 'package:flutter/rendering.dart';
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import 'package:tuple/tuple.dart';
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class ViewStateConductor {
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final List<Tuple2<String, ValueNotifier<ViewState>>> _controllers = [];
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Size _viewportSize = Size.zero;
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static const maxControllerCount = 3;
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Future<void> dispose() async {
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_controllers.clear();
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}
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set viewportSize(Size size) => _viewportSize = size;
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ValueNotifier<ViewState> getOrCreateController(AvesEntry entry) {
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var controller = _controllers.firstOrNull;
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if (controller == null || controller.item1 != entry.uri) {
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controller = _controllers.firstWhereOrNull((kv) => kv.item1 == entry.uri);
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if (controller != null) {
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_controllers.remove(controller);
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} else {
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// try to initialize the view state to match magnifier initial state
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const initialScale = ScaleLevel(ref: ScaleReference.contained);
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final initialValue = ViewState(
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position: Offset.zero,
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scale: ScaleBoundaries(
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allowOriginalScaleBeyondRange: true,
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minScale: initialScale,
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maxScale: initialScale,
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initialScale: initialScale,
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viewportSize: _viewportSize,
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childSize: entry.displaySize,
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).initialScale,
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viewportSize: _viewportSize,
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contentSize: entry.displaySize,
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);
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controller = Tuple2(entry.uri, ValueNotifier<ViewState>(initialValue));
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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().item2.dispose();
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}
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}
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return controller.item2;
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}
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void reset(AvesEntry entry) {
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final uris = <AvesEntry>{
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entry,
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...?entry.burstEntries,
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}.map((v) => v.uri).toSet();
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_controllers.removeWhere((kv) => uris.contains(kv.item1));
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}
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}
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