90 lines
3.3 KiB
Dart
90 lines
3.3 KiB
Dart
import 'package:aves/widgets/common/magnifier/controller/controller.dart';
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import 'package:aves/widgets/common/magnifier/controller/state.dart';
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import 'package:aves/widgets/common/magnifier/core/core.dart';
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import 'package:aves/widgets/common/magnifier/scale/scale_boundaries.dart';
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import 'package:aves/widgets/common/magnifier/scale/scale_level.dart';
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import 'package:aves/widgets/common/magnifier/scale/state.dart';
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import 'package:flutter/material.dart';
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/*
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`Magnifier` is derived from `photo_view` package v0.9.2:
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- removed image related aspects to focus on a general purpose pan/scale viewer (à la `InteractiveViewer`)
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- removed rotation and many customization parameters
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- removed ignorable/ignoring partial notifiers
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- formatted, renamed and reorganized
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- fixed gesture recognizers when used inside a scrollable widget like `PageView`
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- fixed corner hit detection when in containers scrollable in both axes
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- fixed corner hit detection issues due to imprecise double comparisons
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- added single & double tap position feedback
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- fixed focus when scaling by double-tap/pinch
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*/
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class Magnifier extends StatelessWidget {
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const Magnifier({
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Key key,
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@required this.controller,
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@required this.childSize,
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this.minScale = const ScaleLevel(factor: .0),
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this.maxScale = const ScaleLevel(factor: double.infinity),
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this.initialScale = const ScaleLevel(ref: ScaleReference.contained),
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this.scaleStateCycle = defaultScaleStateCycle,
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this.applyScale = true,
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this.onTap,
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@required this.child,
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}) : assert(controller != null),
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assert(childSize != null),
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assert(minScale != null),
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assert(maxScale != null),
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assert(initialScale != null),
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assert(scaleStateCycle != null),
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assert(applyScale != null),
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super(key: key);
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final MagnifierController controller;
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// The size of the custom [child]. This value is used to compute the relation between the child and the container's size to calculate the scale value.
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final Size childSize;
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// Defines the minimum size in which the image will be allowed to assume, it is proportional to the original image size.
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final ScaleLevel minScale;
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// Defines the maximum size in which the image will be allowed to assume, it is proportional to the original image size.
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final ScaleLevel maxScale;
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// Defines the size the image will assume when the component is initialized, it is proportional to the original image size.
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final ScaleLevel initialScale;
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final ScaleStateCycle scaleStateCycle;
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final bool applyScale;
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final MagnifierTapCallback onTap;
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final Widget child;
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@override
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Widget build(BuildContext context) {
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return LayoutBuilder(
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builder: (context, constraints) {
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controller.setScaleBoundaries(ScaleBoundaries(
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minScale: minScale,
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maxScale: maxScale,
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initialScale: initialScale,
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viewportSize: constraints.biggest,
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childSize: childSize?.isEmpty == false ? childSize : constraints.biggest,
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));
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return MagnifierCore(
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controller: controller,
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scaleStateCycle: scaleStateCycle,
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onTap: onTap,
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applyScale: applyScale,
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child: child,
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);
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},
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);
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}
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}
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typedef MagnifierTapCallback = Function(
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BuildContext context,
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TapUpDetails details,
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MagnifierState state,
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Offset childTapPosition,
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);
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