53 lines
1.7 KiB
Dart
53 lines
1.7 KiB
Dart
import 'package:aves/widgets/common/fx/checkered_decoration.dart';
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import 'package:aves/widgets/viewer/visual/entry_page_view.dart';
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import 'package:aves/widgets/viewer/visual/state.dart';
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import 'package:flutter/foundation.dart';
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import 'package:flutter/material.dart';
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class VectorViewCheckeredBackground extends StatelessWidget {
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final Size displaySize;
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final ValueNotifier<ViewState> viewStateNotifier;
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final Widget child;
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const VectorViewCheckeredBackground({
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@required this.displaySize,
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@required this.viewStateNotifier,
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@required this.child,
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});
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@override
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Widget build(BuildContext context) {
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return ValueListenableBuilder<ViewState>(
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valueListenable: viewStateNotifier,
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builder: (context, viewState, child) {
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final viewportSize = viewState.viewportSize;
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if (viewportSize == null) return child;
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final side = viewportSize.shortestSide;
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final checkSize = side / ((side / EntryPageView.decorationCheckSize).round());
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final viewSize = displaySize * viewState.scale;
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final decorationSize = applyBoxFit(BoxFit.none, viewSize, viewportSize).source;
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final offset = ((decorationSize - viewportSize) as Offset) / 2;
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return Stack(
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alignment: Alignment.center,
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children: [
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Positioned(
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width: decorationSize.width,
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height: decorationSize.height,
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child: CustomPaint(
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painter: CheckeredPainter(
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checkSize: checkSize,
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offset: offset,
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),
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),
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),
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child,
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],
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);
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},
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child: child,
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);
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}
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}
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