102 lines
3.2 KiB
Dart
102 lines
3.2 KiB
Dart
import 'dart:math';
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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 Minimap extends StatelessWidget {
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final ValueNotifier<ViewState> viewStateNotifier;
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static const Size minimapSize = Size(96, 96);
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const Minimap({
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Key? key,
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required this.viewStateNotifier,
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}) : super(key: key);
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@override
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Widget build(BuildContext context) {
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return IgnorePointer(
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child: 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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final contentSize = viewState.contentSize;
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if (viewportSize == null || contentSize == null) return const SizedBox();
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return CustomPaint(
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painter: MinimapPainter(
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viewportSize: viewportSize,
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contentSize: contentSize,
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viewCenterOffset: viewState.position,
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viewScale: viewState.scale!,
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minimapBorderColor: Colors.white30,
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),
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size: minimapSize,
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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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class MinimapPainter extends CustomPainter {
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final Size contentSize, viewportSize;
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final Offset viewCenterOffset;
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final double viewScale;
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final Color minimapBorderColor, viewportBorderColor;
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const MinimapPainter({
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required this.viewportSize,
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required this.contentSize,
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required this.viewCenterOffset,
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required this.viewScale,
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this.minimapBorderColor = Colors.white,
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this.viewportBorderColor = Colors.white,
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});
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@override
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void paint(Canvas canvas, Size size) {
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if (contentSize.width <= 0 || contentSize.height <= 0) return;
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final viewSize = contentSize * viewScale;
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if (viewSize.isEmpty) return;
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// hide minimap when image is in full view
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if (viewportSize + const Offset(precisionErrorTolerance, precisionErrorTolerance) >= viewSize) return;
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final canvasScale = size.longestSide / viewSize.longestSide;
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final scaledContentSize = viewSize * canvasScale;
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final scaledViewportSize = viewportSize * canvasScale;
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final contentRect = Rect.fromCenter(
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center: size.center(Offset.zero),
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width: scaledContentSize.width,
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height: scaledContentSize.height,
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);
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final viewportRect = Rect.fromCenter(
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center: size.center(Offset.zero) - viewCenterOffset * canvasScale,
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width: min(scaledContentSize.width, scaledViewportSize.width),
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height: min(scaledContentSize.height, scaledViewportSize.height),
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);
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canvas.translate((contentRect.width - size.width) / 2, (contentRect.height - size.height) / 2);
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final fill = Paint()
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..style = PaintingStyle.fill
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..color = const Color(0x33000000);
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final minimapStroke = Paint()
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..style = PaintingStyle.stroke
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..color = minimapBorderColor;
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final viewportStroke = Paint()
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..style = PaintingStyle.stroke
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..color = viewportBorderColor;
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canvas.drawRect(viewportRect, fill);
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canvas.drawRect(contentRect, fill);
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canvas.drawRect(contentRect, minimapStroke);
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canvas.drawRect(viewportRect, viewportStroke);
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}
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@override
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bool shouldRepaint(covariant CustomPainter oldDelegate) => true;
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}
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