740 lines
28 KiB
Dart
740 lines
28 KiB
Dart
import 'dart:async';
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import 'dart:math';
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import 'package:aves/model/viewer/view_state.dart';
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import 'package:aves/theme/durations.dart';
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import 'package:aves/widgets/common/extensions/geometry.dart';
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import 'package:aves/widgets/common/fx/dashed_path_painter.dart';
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import 'package:aves/widgets/editor/transform/controller.dart';
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import 'package:aves/widgets/editor/transform/crop_region.dart';
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import 'package:aves/widgets/editor/transform/handles.dart';
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import 'package:aves/widgets/editor/transform/painter.dart';
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import 'package:aves/widgets/editor/transform/transformation.dart';
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import 'package:aves_magnifier/aves_magnifier.dart';
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import 'package:aves_model/aves_model.dart';
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import 'package:aves_utils/aves_utils.dart';
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import 'package:collection/collection.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 Cropper extends StatefulWidget {
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final AvesMagnifierController magnifierController;
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final TransformController transformController;
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final ValueNotifier<EdgeInsets> marginNotifier;
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static const double handleDimension = kMinInteractiveDimension;
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static const EdgeInsets imageMargin = EdgeInsets.all(kMinInteractiveDimension);
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const Cropper({
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super.key,
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required this.magnifierController,
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required this.transformController,
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required this.marginNotifier,
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});
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@override
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State<Cropper> createState() => _CropperState();
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}
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class _CropperState extends State<Cropper> with SingleTickerProviderStateMixin {
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final List<StreamSubscription> _subscriptions = [];
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final ValueNotifier<Rect> _outlineNotifier = ValueNotifier(Rect.zero);
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final ValueNotifier<int> _gridDivisionNotifier = ValueNotifier(0);
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late AnimationController _gridAnimationController;
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late CurvedAnimation _gridOpacity;
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static const double minDimension = Cropper.handleDimension;
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static const int panResizeGridDivision = 3;
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static const int straightenGridDivision = 9;
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static const double overOutlineFactor = .25;
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AvesMagnifierController get magnifierController => widget.magnifierController;
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TransformController get transformController => widget.transformController;
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Transformation get transformation => transformController.transformation;
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CropAspectRatio get cropAspectRatio => transformController.aspectRatioNotifier.value;
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@override
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void initState() {
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super.initState();
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_gridAnimationController = AnimationController(
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duration: context.read<DurationsData>().viewerOverlayAnimation,
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vsync: this,
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);
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_gridOpacity = CurvedAnimation(
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parent: _gridAnimationController,
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curve: Curves.easeOutQuad,
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);
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_registerWidget(widget);
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}
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@override
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void didUpdateWidget(covariant Cropper oldWidget) {
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super.didUpdateWidget(oldWidget);
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_unregisterWidget(oldWidget);
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_registerWidget(widget);
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}
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@override
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void dispose() {
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_outlineNotifier.dispose();
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_gridDivisionNotifier.dispose();
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_gridOpacity.dispose();
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_gridAnimationController.dispose();
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_unregisterWidget(widget);
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super.dispose();
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}
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void _registerWidget(Cropper widget) {
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_subscriptions.add(widget.magnifierController.stateStream.listen(_onViewStateChanged));
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_subscriptions.add(widget.magnifierController.scaleBoundariesStream.map((v) => v.viewportSize).listen(_onViewportSizeChanged));
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_subscriptions.add(widget.transformController.eventStream.listen(_onTransformEvent));
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_subscriptions.add(widget.transformController.transformationStream.map((v) => v.orientation).distinct().listen(_onOrientationChanged));
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_subscriptions.add(widget.transformController.transformationStream.map((v) => v.straightenDegrees).distinct().listen(_onStraightenDegreesChanged));
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widget.transformController.aspectRatioNotifier.addListener(_onCropAspectRatioChanged);
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}
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void _unregisterWidget(Cropper widget) {
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_subscriptions
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..forEach((sub) => sub.cancel())
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..clear();
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widget.transformController.aspectRatioNotifier.removeListener(_onCropAspectRatioChanged);
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}
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@override
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Widget build(BuildContext context) {
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return Positioned.fill(
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child: ValueListenableBuilder<EdgeInsets>(
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valueListenable: widget.marginNotifier,
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builder: (context, margin, child) {
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return ValueListenableBuilder<Rect>(
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valueListenable: _outlineNotifier,
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builder: (context, outline, child) {
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if (outline.isEmpty) return const SizedBox();
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final outlineVisualRect = outline.translate(margin.left, margin.top);
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return Stack(
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children: [
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Positioned.fill(
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child: IgnorePointer(
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child: Stack(
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children: [
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_buildDashLine([outlineVisualRect.topLeft, outlineVisualRect.topRight]),
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_buildDashLine([outlineVisualRect.bottomLeft, outlineVisualRect.bottomRight]),
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_buildDashLine([outlineVisualRect.topLeft, outlineVisualRect.bottomLeft]),
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_buildDashLine([outlineVisualRect.topRight, outlineVisualRect.bottomRight]),
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Positioned.fill(
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child: ValueListenableBuilder<int>(
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valueListenable: _gridDivisionNotifier,
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builder: (context, gridDivision, child) {
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return ValueListenableBuilder<double>(
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valueListenable: _gridOpacity,
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builder: (context, gridOpacity, child) {
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return CustomPaint(
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painter: CropperPainter(
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rect: outlineVisualRect,
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gridOpacity: gridOpacity,
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gridDivision: gridDivision,
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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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],
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),
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),
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),
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_buildVertexHandle(
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margin: margin,
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getPosition: () => outline.topLeft,
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setPosition: (v) => _handleOutline(
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topLeft: Offset(min(outline.right - minDimension, v.dx), min(outline.bottom - minDimension, v.dy)),
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),
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),
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_buildVertexHandle(
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margin: margin,
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getPosition: () => outline.topRight,
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setPosition: (v) => _handleOutline(
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topRight: Offset(max(outline.left + minDimension, v.dx), min(outline.bottom - minDimension, v.dy)),
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),
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),
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_buildVertexHandle(
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margin: margin,
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getPosition: () => outline.bottomRight,
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setPosition: (v) => _handleOutline(
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bottomRight: Offset(max(outline.left + minDimension, v.dx), max(outline.top + minDimension, v.dy)),
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),
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),
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_buildVertexHandle(
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margin: margin,
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getPosition: () => outline.bottomLeft,
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setPosition: (v) => _handleOutline(
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bottomLeft: Offset(min(outline.right - minDimension, v.dx), max(outline.top + minDimension, v.dy)),
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),
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),
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_buildEdgeHandle(
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margin: margin,
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getEdge: () => Rect.fromPoints(outline.bottomLeft, outline.topLeft),
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setEdge: (v) {
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final left = min(outline.right - minDimension, v.left);
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return _handleOutline(
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topLeft: Offset(left, outline.top),
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bottomLeft: Offset(left, outline.bottom),
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);
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},
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),
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_buildEdgeHandle(
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margin: margin,
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getEdge: () => Rect.fromPoints(outline.topLeft, outline.topRight),
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setEdge: (v) {
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final top = min(outline.bottom - minDimension, v.top);
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return _handleOutline(
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topLeft: Offset(outline.left, top),
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topRight: Offset(outline.right, top),
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);
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},
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),
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_buildEdgeHandle(
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margin: margin,
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getEdge: () => Rect.fromPoints(outline.bottomRight, outline.topRight),
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setEdge: (v) {
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final right = max(outline.left + minDimension, v.right);
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return _handleOutline(
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topRight: Offset(right, outline.top),
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bottomRight: Offset(right, outline.bottom),
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);
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},
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),
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_buildEdgeHandle(
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margin: margin,
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getEdge: () => Rect.fromPoints(outline.bottomLeft, outline.bottomRight),
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setEdge: (v) {
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final bottom = max(outline.top + minDimension, v.bottom);
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return _handleOutline(
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bottomLeft: Offset(outline.left, bottom),
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bottomRight: Offset(outline.right, bottom),
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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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},
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),
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);
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}
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// use 1 painter per line so that the dashes of one line
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// do not get offset depending on the previous line length
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Widget _buildDashLine(List<Offset> points) => CustomPaint(
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painter: DashedPathPainter(
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originalPath: Path()..addPolygon(points, false),
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pathColor: CropperPainter.borderColor,
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strokeWidth: CropperPainter.borderWidth,
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),
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);
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void _handleOutline({
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Offset? topLeft,
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Offset? topRight,
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Offset? bottomRight,
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Offset? bottomLeft,
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}) {
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final currentOutline = _outlineNotifier.value;
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var targetOutline = Rect.fromLTRB(
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topLeft?.dx ?? bottomLeft?.dx ?? currentOutline.left,
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topLeft?.dy ?? topRight?.dy ?? currentOutline.top,
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topRight?.dx ?? bottomRight?.dx ?? currentOutline.right,
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bottomLeft?.dy ?? bottomRight?.dy ?? currentOutline.bottom,
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);
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_RatioStrategy? ratioStrategy;
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if (topLeft != null && topRight != null) {
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ratioStrategy = _RatioStrategy.pinBottom;
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} else if (topRight != null && bottomRight != null) {
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ratioStrategy = _RatioStrategy.pinLeft;
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} else if (bottomLeft != null && bottomRight != null) {
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ratioStrategy = _RatioStrategy.pinTop;
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} else if (topLeft != null && bottomLeft != null) {
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ratioStrategy = _RatioStrategy.pinRight;
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} else if (topLeft != null) {
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ratioStrategy = _RatioStrategy.pinBottomRight;
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} else if (topRight != null) {
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ratioStrategy = _RatioStrategy.pinBottomLeft;
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} else if (bottomRight != null) {
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ratioStrategy = _RatioStrategy.pinTopLeft;
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} else if (bottomLeft != null) {
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ratioStrategy = _RatioStrategy.pinTopRight;
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}
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if (ratioStrategy != null) {
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targetOutline = _applyCropRatioToOutline(targetOutline, ratioStrategy);
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}
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// do not try to coerce outline handled outside tilted image
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if (transformation.straightenDegrees != 0 && !_isOutlineContained(targetOutline)) return;
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// dismiss if we could not honour aspect ratio
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if (cropAspectRatio != CropAspectRatio.free && !_isOutlineContained(targetOutline)) return;
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final currentState = _getViewState();
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final boundaries = magnifierController.scaleBoundaries;
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if (currentState == null || boundaries == null) return;
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final gestureRegion = _regionFromOutline(currentState, targetOutline);
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final viewportSize = boundaries.viewportSize;
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final gestureOutline = _regionToContainedOutline(currentState, gestureRegion);
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final clampedOutline = Rect.fromLTRB(
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max(gestureOutline.left, 0),
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max(gestureOutline.top, 0),
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min(gestureOutline.right, viewportSize.width),
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min(gestureOutline.bottom, viewportSize.height),
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);
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_setOutline(clampedOutline);
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_updateCropRegion();
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// zoom out when user gesture reaches outer edges
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if (gestureOutline.width - clampedOutline.width > precisionErrorTolerance || gestureOutline.height - clampedOutline.height > precisionErrorTolerance) {
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final targetOutline = Rect.lerp(clampedOutline, gestureOutline, overOutlineFactor)!;
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final targetRegion = _regionFromOutline(currentState, targetOutline);
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final nextState = _viewStateForContainedRegion(boundaries, targetRegion);
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if (nextState != currentState) {
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magnifierController.update(
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position: nextState.position,
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scale: nextState.scale,
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source: ChangeSource.animation,
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);
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_setOutline(_regionToContainedOutline(nextState, targetRegion));
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}
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}
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}
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bool _isOutlineContained(Rect outline) {
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final currentState = _getViewState();
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final boundaries = magnifierController.scaleBoundaries;
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if (currentState == null || boundaries == null) return false;
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final regionToOutlineMatrix = _getRegionToOutlineMatrix(currentState);
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final outlineToRegionMatrix = Matrix4.inverted(regionToOutlineMatrix);
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final regionCorners = {
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outline.topLeft,
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outline.topRight,
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outline.bottomRight,
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outline.bottomLeft,
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}.map(outlineToRegionMatrix.transformOffset).toSet();
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final contentRect = Offset.zero & boundaries.contentSize;
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return regionCorners.every((v) => contentRect.containsIncludingBottomRight(v, tolerance: precisionErrorTolerance));
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}
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VertexHandle _buildVertexHandle({
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required EdgeInsets margin,
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required ValueGetter<Offset> getPosition,
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required ValueSetter<Offset> setPosition,
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}) {
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return VertexHandle(
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margin: margin,
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getPosition: getPosition,
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setPosition: setPosition,
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onDragStart: _onDragStart,
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onDragEnd: _onDragEnd,
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);
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}
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EdgeHandle _buildEdgeHandle({
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required EdgeInsets margin,
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required ValueGetter<Rect> getEdge,
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required ValueSetter<Rect> setEdge,
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}) {
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return EdgeHandle(
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margin: margin,
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getEdge: getEdge,
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setEdge: setEdge,
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onDragStart: _onDragStart,
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onDragEnd: _onDragEnd,
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);
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}
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void _onDragStart() {
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transformController.activity = TransformActivity.resize;
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}
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void _onDragEnd() {
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transformController.activity = TransformActivity.none;
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_showRegion();
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}
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void _showRegion() {
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final boundaries = magnifierController.scaleBoundaries;
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if (boundaries == null) return;
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final region = transformation.region;
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final nextState = _viewStateForContainedRegion(boundaries, region);
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magnifierController.update(
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position: nextState.position,
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scale: nextState.scale,
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source: ChangeSource.animation,
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);
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_setOutline(_regionToContainedOutline(nextState, region));
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}
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ViewState _viewStateForContainedRegion(ScaleBoundaries boundaries, CropRegion imageRegion) {
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final matrix = transformation.matrix;
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final displayRegion = imageRegion.corners.map(matrix.transformOffset).toSet();
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final xMin = displayRegion.map((v) => v.dx).min;
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final xMax = displayRegion.map((v) => v.dx).max;
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final yMin = displayRegion.map((v) => v.dy).min;
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final yMax = displayRegion.map((v) => v.dy).max;
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final displayRegionSize = Size(xMax - xMin, yMax - yMin);
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final nextScale = boundaries.clampScale(ScaleLevel.scaleForContained(boundaries.viewportSize, displayRegionSize));
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final nextPosition = boundaries.clampPosition(
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position: boundaries.contentToStatePosition(nextScale, imageRegion.center),
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scale: nextScale,
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);
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return ViewState(
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position: nextPosition,
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scale: nextScale,
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viewportSize: boundaries.viewportSize,
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contentSize: boundaries.contentSize,
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);
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}
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void _onTransformEvent(TransformEvent event) {
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final activity = event.activity;
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switch (activity) {
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case TransformActivity.none:
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break;
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case TransformActivity.pan:
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case TransformActivity.resize:
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_gridDivisionNotifier.value = panResizeGridDivision;
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case TransformActivity.straighten:
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_gridDivisionNotifier.value = straightenGridDivision;
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}
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if (activity == TransformActivity.none) {
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_gridAnimationController.reverse();
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} else {
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_gridAnimationController.forward();
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}
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}
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void _onOrientationChanged(TransformOrientation orientation) {
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_showRegion();
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}
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void _onStraightenDegreesChanged(double degrees) {
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_updateCropRegion();
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}
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void _onCropAspectRatioChanged() {
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final viewState = _getViewState();
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if (viewState == null) return;
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var targetOutline = _applyCropRatioToOutline(_outlineNotifier.value, _RatioStrategy.keepArea);
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if (!_isOutlineContained(targetOutline)) {
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targetOutline = _applyCropRatioToOutline(_outlineNotifier.value, _RatioStrategy.contain);
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}
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transformController.cropRegion = _regionFromOutline(viewState, targetOutline);
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_showRegion();
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}
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void _onViewStateChanged(MagnifierState state) {
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final currentOutline = _outlineNotifier.value;
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// switch (state.source) {
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// case ChangeSource.internal:
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// case ChangeSource.animation:
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// _setOutline(currentOutline);
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// case ChangeSource.gesture:
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// TODO TLAD [crop] use other strat
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_setOutline(_applyCropRatioToOutline(currentOutline, _RatioStrategy.contain));
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_updateCropRegion();
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// }
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}
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void _onViewportSizeChanged(Size viewportSize) {
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_initOutline(transformation.region);
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final boundaries = magnifierController.scaleBoundaries;
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if (boundaries != null) {
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final double xPadding = (viewportSize.width - minDimension) / 2;
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final double yPadding = (viewportSize.height - minDimension) / 2;
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magnifierController.setScaleBoundaries(
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boundaries.copyWith(
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padding: EdgeInsets.symmetric(horizontal: xPadding, vertical: yPadding),
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),
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);
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}
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}
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ViewState? _getViewState() {
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final scaleBoundaries = magnifierController.scaleBoundaries;
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if (scaleBoundaries == null) return null;
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final state = magnifierController.currentState;
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return ViewState(
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position: state.position,
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scale: state.scale,
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viewportSize: scaleBoundaries.viewportSize,
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contentSize: scaleBoundaries.contentSize,
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);
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}
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void _initOutline(CropRegion region) {
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final viewState = _getViewState();
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if (viewState != null) {
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_setOutline(_regionToContainedOutline(viewState, region));
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_updateCropRegion();
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}
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}
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void _setOutline(Rect targetOutline) {
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final viewState = _getViewState();
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final viewportSize = viewState?.viewportSize;
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if (targetOutline.isEmpty || viewState == null || viewportSize == null) return;
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// ensure outline is within content
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final targetRegion = _regionFromOutline(viewState, targetOutline);
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var newOutline = _regionToContainedOutline(viewState, targetRegion);
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// ensure outline is large enough to be handled
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|
newOutline = Rect.fromLTWH(
|
|
newOutline.left,
|
|
newOutline.top,
|
|
max(newOutline.width, minDimension),
|
|
max(newOutline.height, minDimension),
|
|
);
|
|
|
|
// ensure outline is within viewport
|
|
newOutline = Rect.fromLTRB(
|
|
max(newOutline.left, 0),
|
|
max(newOutline.top, 0),
|
|
min(newOutline.right, viewportSize.width),
|
|
min(newOutline.bottom, viewportSize.height),
|
|
);
|
|
|
|
_outlineNotifier.value = newOutline;
|
|
}
|
|
|
|
void _updateCropRegion() {
|
|
final viewState = _getViewState();
|
|
final outline = _outlineNotifier.value;
|
|
if (viewState != null && !outline.isEmpty) {
|
|
transformController.cropRegion = _regionFromOutline(viewState, outline);
|
|
}
|
|
}
|
|
|
|
Matrix4 _getRegionToOutlineMatrix(ViewState viewState) {
|
|
final magnifierMatrix = viewState.matrix;
|
|
|
|
final viewportCenter = viewState.viewportSize!.center(Offset.zero);
|
|
final transformOrigin = Matrix4.inverted(magnifierMatrix).transformOffset(viewportCenter);
|
|
final transformMatrix = Matrix4.identity()
|
|
..translate(transformOrigin.dx, transformOrigin.dy)
|
|
..multiply(transformation.matrix)
|
|
..translate(-transformOrigin.dx, -transformOrigin.dy);
|
|
|
|
return magnifierMatrix..multiply(transformMatrix);
|
|
}
|
|
|
|
CropRegion _regionFromOutline(ViewState viewState, Rect outline) {
|
|
final regionToOutlineMatrix = _getRegionToOutlineMatrix(viewState);
|
|
final outlineToRegionMatrix = regionToOutlineMatrix..invert();
|
|
|
|
final region = CropRegion(
|
|
topLeft: outlineToRegionMatrix.transformOffset(outline.topLeft),
|
|
topRight: outlineToRegionMatrix.transformOffset(outline.topRight),
|
|
bottomRight: outlineToRegionMatrix.transformOffset(outline.bottomRight),
|
|
bottomLeft: outlineToRegionMatrix.transformOffset(outline.bottomLeft),
|
|
);
|
|
|
|
final rect = Offset.zero & viewState.contentSize!;
|
|
double clampX(double dx) => dx.clamp(rect.left, rect.right);
|
|
double clampY(double dy) => dy.clamp(rect.top, rect.bottom);
|
|
Offset clampPoint(Offset v) => Offset(clampX(v.dx), clampY(v.dy));
|
|
final clampedRegion = CropRegion(
|
|
topLeft: clampPoint(region.topLeft),
|
|
topRight: clampPoint(region.topRight),
|
|
bottomRight: clampPoint(region.bottomRight),
|
|
bottomLeft: clampPoint(region.bottomLeft),
|
|
);
|
|
return clampedRegion;
|
|
}
|
|
|
|
Rect _regionToContainedOutline(ViewState viewState, CropRegion region) {
|
|
final matrix = _getRegionToOutlineMatrix(viewState);
|
|
final points = region.corners.map(matrix.transformOffset).toSet();
|
|
final sortedX = points.map((v) => v.dx).toList()..sort();
|
|
final sortedY = points.map((v) => v.dy).toList()..sort();
|
|
final topLeft = Offset(sortedX[1], sortedY[1]);
|
|
final bottomRight = Offset(sortedX[2], sortedY[2]);
|
|
return Rect.fromPoints(topLeft, bottomRight);
|
|
}
|
|
|
|
Rect _applyCropRatioToOutline(Rect outline, _RatioStrategy strategy) {
|
|
final currentState = _getViewState();
|
|
final boundaries = magnifierController.scaleBoundaries;
|
|
if (currentState == null || boundaries == null) return outline;
|
|
|
|
final contentSize = boundaries.contentSize;
|
|
|
|
late int longCoef;
|
|
late int shortCoef;
|
|
switch (cropAspectRatio) {
|
|
case CropAspectRatio.free:
|
|
return outline;
|
|
case CropAspectRatio.original:
|
|
longCoef = contentSize.longestSide.round();
|
|
shortCoef = contentSize.shortestSide.round();
|
|
case CropAspectRatio.square:
|
|
longCoef = 1;
|
|
shortCoef = 1;
|
|
case CropAspectRatio.ar_16_9:
|
|
longCoef = 16;
|
|
shortCoef = 9;
|
|
case CropAspectRatio.ar_4_3:
|
|
longCoef = 4;
|
|
shortCoef = 3;
|
|
}
|
|
|
|
final contentRect = Offset.zero & contentSize;
|
|
final isLandscape = (outline.width - outline.height).abs() > precisionErrorTolerance ? outline.width > outline.height : contentSize.width > contentSize.height;
|
|
final newRatio = isLandscape ? longCoef / shortCoef : shortCoef / longCoef;
|
|
|
|
Size sizeToKeepArea() {
|
|
final f = (outline.longestSide + outline.shortestSide) / (longCoef + shortCoef);
|
|
final newLongest = f * longCoef;
|
|
final newShortest = f * shortCoef;
|
|
return isLandscape ? Size(newLongest, newShortest) : Size(newShortest, newLongest);
|
|
}
|
|
|
|
final regionToOutlineMatrix = _getRegionToOutlineMatrix(currentState);
|
|
final outlineToRegionMatrix = Matrix4.inverted(regionToOutlineMatrix);
|
|
|
|
Rect pinnedRect(Rect Function(Size targetSize) forSize) {
|
|
final targetSize = sizeToKeepArea();
|
|
final rect = forSize(targetSize);
|
|
|
|
// do not try to coerce outline handled outside tilted image
|
|
if (transformation.straightenDegrees != 0) return rect;
|
|
|
|
final regionCorners = {
|
|
rect.topLeft,
|
|
rect.topRight,
|
|
rect.bottomRight,
|
|
rect.bottomLeft,
|
|
}.map(outlineToRegionMatrix.transformOffset).toSet();
|
|
|
|
if (regionCorners.every((v) => contentRect.containsIncludingBottomRight(v, tolerance: precisionErrorTolerance))) return rect;
|
|
|
|
final clampedOutlineCorners = regionCorners.map((v) => regionToOutlineMatrix.transformOffset(Offset(v.dx.clamp(0, contentSize.width), v.dy.clamp(0, contentSize.height)))).toSet();
|
|
final minX = clampedOutlineCorners.map((v) => v.dx).min;
|
|
final maxX = clampedOutlineCorners.map((v) => v.dx).max;
|
|
final minY = clampedOutlineCorners.map((v) => v.dy).min;
|
|
final maxY = clampedOutlineCorners.map((v) => v.dy).max;
|
|
|
|
var width = rect.width;
|
|
var height = rect.height;
|
|
if (rect.left < minX - precisionErrorTolerance) {
|
|
width = rect.right - minX;
|
|
height = width / newRatio;
|
|
} else if (rect.top < minY - precisionErrorTolerance) {
|
|
height = rect.bottom - minY;
|
|
width = height * newRatio;
|
|
} else if (rect.right > maxX + precisionErrorTolerance) {
|
|
width = maxX - rect.left;
|
|
height = width / newRatio;
|
|
} else if (rect.bottom > maxY + precisionErrorTolerance) {
|
|
height = maxY - rect.top;
|
|
width = height * newRatio;
|
|
}
|
|
final clampedSize = Size(width, height);
|
|
return clampedSize < targetSize ? forSize(clampedSize) : rect;
|
|
}
|
|
|
|
switch (strategy) {
|
|
case _RatioStrategy.keepArea:
|
|
final targetSize = sizeToKeepArea();
|
|
return Rect.fromCenter(
|
|
center: outline.center,
|
|
width: targetSize.width,
|
|
height: targetSize.height,
|
|
);
|
|
case _RatioStrategy.contain:
|
|
final currentRatio = outline.width / outline.height;
|
|
if ((newRatio - currentRatio).abs() < precisionErrorTolerance) {
|
|
return outline;
|
|
} else {
|
|
late final Size targetSize;
|
|
if (newRatio > currentRatio) {
|
|
targetSize = Size(outline.width, outline.width / newRatio);
|
|
} else {
|
|
targetSize = Size(outline.height * newRatio, outline.height);
|
|
}
|
|
return Rect.fromCenter(
|
|
center: outline.center,
|
|
width: targetSize.width,
|
|
height: targetSize.height,
|
|
);
|
|
}
|
|
case _RatioStrategy.pinTopLeft:
|
|
return pinnedRect((targetSize) => Rect.fromPoints(
|
|
outline.topLeft,
|
|
outline.topLeft.translate(targetSize.width, targetSize.height),
|
|
));
|
|
case _RatioStrategy.pinTopRight:
|
|
return pinnedRect((targetSize) => Rect.fromPoints(
|
|
outline.topRight,
|
|
outline.topRight.translate(-targetSize.width, targetSize.height),
|
|
));
|
|
case _RatioStrategy.pinBottomRight:
|
|
return pinnedRect((targetSize) => Rect.fromPoints(
|
|
outline.bottomRight,
|
|
outline.bottomRight.translate(-targetSize.width, -targetSize.height),
|
|
));
|
|
case _RatioStrategy.pinBottomLeft:
|
|
return pinnedRect((targetSize) => Rect.fromPoints(
|
|
outline.bottomLeft,
|
|
outline.bottomLeft.translate(targetSize.width, -targetSize.height),
|
|
));
|
|
case _RatioStrategy.pinLeft:
|
|
return pinnedRect((targetSize) => Rect.fromLTRB(
|
|
outline.left,
|
|
outline.center.dy - targetSize.height / 2,
|
|
outline.left + targetSize.width,
|
|
outline.center.dy + targetSize.height / 2,
|
|
));
|
|
case _RatioStrategy.pinTop:
|
|
return pinnedRect((targetSize) => Rect.fromLTRB(
|
|
outline.center.dx - targetSize.width / 2,
|
|
outline.top,
|
|
outline.center.dx + targetSize.width / 2,
|
|
outline.top + targetSize.height,
|
|
));
|
|
case _RatioStrategy.pinRight:
|
|
return pinnedRect((targetSize) => Rect.fromLTRB(
|
|
outline.right - targetSize.width,
|
|
outline.center.dy - targetSize.height / 2,
|
|
outline.right,
|
|
outline.center.dy + targetSize.height / 2,
|
|
));
|
|
case _RatioStrategy.pinBottom:
|
|
return pinnedRect((targetSize) => Rect.fromLTRB(
|
|
outline.center.dx - targetSize.width / 2,
|
|
outline.bottom - targetSize.height,
|
|
outline.center.dx + targetSize.width / 2,
|
|
outline.bottom,
|
|
));
|
|
}
|
|
}
|
|
}
|
|
|
|
enum _RatioStrategy { keepArea, contain, pinTopLeft, pinTopRight, pinBottomRight, pinBottomLeft, pinLeft, pinTop, pinRight, pinBottom }
|