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multipage: reset magnifier state when page dimensions change

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This commit is contained in:
Thibault Deckers 2021-01-19 18:58:01 +09:00
parent fd8191639b
commit 4d8e2d4123
1 changed files with 27 additions and 5 deletions
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32
lib/widgets/viewer/visual/entry_page_view.dart
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@ -53,7 +53,7 @@ class EntryPageView extends StatefulWidget {
}
class _EntryPageViewState extends State<EntryPageView> {
final MagnifierController _magnifierController = MagnifierController();
MagnifierController _magnifierController;
final ValueNotifier<ViewState> _viewStateNotifier = ValueNotifier(ViewState.zero);
final List<StreamSubscription> _subscriptions = [];
@ -64,17 +64,39 @@ class _EntryPageViewState extends State<EntryPageView> {
@override
void initState() {
super.initState();
_subscriptions.add(_magnifierController.stateStream.listen(_onViewStateChanged));
_subscriptions.add(_magnifierController.scaleBoundariesStream.listen(_onViewScaleBoundariesChanged));
_registerWidget();
}
@override
void didUpdateWidget(covariant EntryPageView oldWidget) {
super.didUpdateWidget(oldWidget);
if (oldWidget.entry.displaySize != entry.displaySize) {
// do not reset the magnifier view state unless page dimensions change,
// in effect locking the zoom & position when browsing entry pages of the same size
_unregisterWidget();
_registerWidget();
}
}
@override
void dispose() {
_unregisterWidget();
widget.onDisposed?.call();
super.dispose();
}
void _registerWidget() {
_viewStateNotifier.value = ViewState.zero;
_magnifierController = MagnifierController();
_subscriptions.add(_magnifierController.stateStream.listen(_onViewStateChanged));
_subscriptions.add(_magnifierController.scaleBoundariesStream.listen(_onViewScaleBoundariesChanged));
}
void _unregisterWidget() {
_subscriptions
..forEach((sub) => sub.cancel())
..clear();
widget.onDisposed?.call();
super.dispose();
}
@override