70 lines
1.8 KiB
Dart
70 lines
1.8 KiB
Dart
import 'package:flutter/material.dart';
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class OutsideDimMask extends StatelessWidget {
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final double opacity;
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const OutsideDimMask({super.key, this.opacity = 0.6});
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@override
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Widget build(BuildContext context) {
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const a5Ratio = 148 / 210;
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return LayoutBuilder(
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builder: (context, constraints) {
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final width = constraints.maxWidth;
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final height = constraints.maxHeight;
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double frameWidth;
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double frameHeight;
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if (width / height > a5Ratio) {
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frameHeight = height;
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frameWidth = height * a5Ratio;
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} else {
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frameWidth = width;
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frameHeight = width / a5Ratio;
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}
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final left = (width - frameWidth) / 2;
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final top = (height - frameHeight) / 2;
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return Stack(
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children: [
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// Top
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Positioned(
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left: 0,
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right: 0,
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top: 0,
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height: top,
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child: Container(color: Colors.black.withOpacity(opacity)),
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),
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// Bottom
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Positioned(
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left: 0,
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right: 0,
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bottom: 0,
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height: top,
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child: Container(color: Colors.black.withOpacity(opacity)),
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),
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// Left
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Positioned(
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left: 0,
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top: top,
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width: left,
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height: frameHeight,
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child: Container(color: Colors.black.withOpacity(opacity)),
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),
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// Right
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Positioned(
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right: 0,
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top: top,
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width: left,
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height: frameHeight,
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child: Container(color: Colors.black.withOpacity(opacity)),
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),
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],
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);
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},
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);
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}
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}
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