109 lines
3.5 KiB
Dart
109 lines
3.5 KiB
Dart
import 'dart:math';
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import 'package:aves/model/image_entry.dart';
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import 'package:aves/widgets/fullscreen/image_view.dart';
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import 'package:flutter/foundation.dart';
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import 'package:flutter/material.dart';
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import 'package:provider/provider.dart';
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class Minimap extends StatelessWidget {
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final ImageEntry entry;
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final ValueNotifier<ViewState> viewStateNotifier;
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final Size size;
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static const defaultSize = Size(96, 96);
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const Minimap({
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@required this.entry,
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@required this.viewStateNotifier,
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this.size = defaultSize,
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});
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@override
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Widget build(BuildContext context) {
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return IgnorePointer(
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child: Selector<MediaQueryData, Size>(
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selector: (context, mq) => mq.size,
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builder: (context, mqSize, child) {
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return AnimatedBuilder(
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animation: viewStateNotifier,
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builder: (context, child) {
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final viewState = viewStateNotifier.value;
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return CustomPaint(
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painter: MinimapPainter(
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viewportSize: mqSize,
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entrySize: viewState.size ?? entry.displaySize,
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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: size,
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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 entrySize, 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.entrySize,
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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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}) : assert(viewportSize != null),
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assert(entrySize != null),
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assert(viewCenterOffset != null),
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assert(viewScale != null);
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@override
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void paint(Canvas canvas, Size size) {
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final viewSize = entrySize * 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 + Offset(precisionErrorTolerance, precisionErrorTolerance) >= viewSize) return;
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final canvasScale = size.longestSide / viewSize.longestSide;
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final scaledEntrySize = viewSize * canvasScale;
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final scaledViewportSize = viewportSize * canvasScale;
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final entryRect = Rect.fromCenter(
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center: size.center(Offset.zero),
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width: scaledEntrySize.width,
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height: scaledEntrySize.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(scaledEntrySize.width, scaledViewportSize.width),
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height: min(scaledEntrySize.height, scaledViewportSize.height),
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);
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canvas.translate((entryRect.width - size.width) / 2, (entryRect.height - size.height) / 2);
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final fill = Paint()
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..style = PaintingStyle.fill
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..color = 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(entryRect, fill);
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canvas.drawRect(entryRect, minimapStroke);
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canvas.drawRect(viewportRect, viewportStroke);
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}
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@override
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bool shouldRepaint(CustomPainter oldDelegate) => true;
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}
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