87 lines
2.3 KiB
Dart
87 lines
2.3 KiB
Dart
import 'package:aves/model/multipage.dart';
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import 'package:aves/widgets/common/thumbnail/scroller.dart';
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import 'package:aves/widgets/viewer/multipage/controller.dart';
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import 'package:aves/widgets/viewer/view/conductor.dart';
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import 'package:flutter/material.dart';
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import 'package:provider/provider.dart';
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class MultiPageOverlay extends StatefulWidget {
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final MultiPageController controller;
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final double availableWidth;
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final bool scrollable;
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const MultiPageOverlay({
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super.key,
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required this.controller,
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required this.availableWidth,
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required this.scrollable,
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});
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@override
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State<MultiPageOverlay> createState() => _MultiPageOverlayState();
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}
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class _MultiPageOverlayState extends State<MultiPageOverlay> {
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int? _previousPage;
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MultiPageController get controller => widget.controller;
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@override
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void initState() {
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super.initState();
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_registerWidget(widget);
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}
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@override
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void didUpdateWidget(covariant MultiPageOverlay oldWidget) {
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super.didUpdateWidget(oldWidget);
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if (oldWidget.controller != controller) {
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_unregisterWidget(oldWidget);
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_registerWidget(widget);
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}
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}
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@override
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void dispose() {
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_unregisterWidget(widget);
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super.dispose();
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}
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void _registerWidget(MultiPageOverlay widget) {
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widget.controller.pageNotifier.addListener(_onPageChanged);
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}
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void _unregisterWidget(MultiPageOverlay widget) {
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widget.controller.pageNotifier.removeListener(_onPageChanged);
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}
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@override
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Widget build(BuildContext context) {
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return StreamBuilder<MultiPageInfo?>(
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stream: controller.infoStream,
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builder: (context, snapshot) {
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final multiPageInfo = controller.info;
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return ThumbnailScroller(
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key: ValueKey(multiPageInfo),
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availableWidth: widget.availableWidth,
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entryCount: multiPageInfo?.pageCount ?? 0,
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entryBuilder: (page) => multiPageInfo?.getPageEntryByIndex(page),
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indexNotifier: controller.pageNotifier,
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scrollable: widget.scrollable,
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);
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},
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);
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}
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void _onPageChanged() {
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if (_previousPage != null) {
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final info = controller.info;
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if (info != null) {
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final oldPageEntry = info.getPageEntryByIndex(_previousPage);
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context.read<ViewStateConductor>().reset(oldPageEntry);
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}
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}
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_previousPage = controller.page;
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}
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}
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