60 lines
2.3 KiB
Dart
60 lines
2.3 KiB
Dart
import 'dart:ui';
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import 'package:aves/widgets/common/magnifier/controller/controller.dart';
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import 'package:aves/widgets/common/magnifier/scale/scale_level.dart';
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import 'package:flutter/foundation.dart';
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/// Internal class to wrap custom scale boundaries (min, max and initial)
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/// Also, stores values regarding the two sizes: the container and the child.
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class ScaleBoundaries {
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const ScaleBoundaries(
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this._minScale,
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this._maxScale,
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this._initialScale,
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this.viewportSize,
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this.childSize,
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);
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final ScaleLevel _minScale;
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final ScaleLevel _maxScale;
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final ScaleLevel _initialScale;
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final Size viewportSize;
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final Size childSize;
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double _scaleForLevel(ScaleLevel level) {
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final factor = level.factor;
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switch (level.ref) {
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case ScaleReference.contained:
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return factor * ScaleLevel.scaleForContained(viewportSize, childSize);
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case ScaleReference.covered:
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return factor * ScaleLevel.scaleForCovering(viewportSize, childSize);
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case ScaleReference.absolute:
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default:
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return factor;
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}
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}
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double get minScale => _scaleForLevel(_minScale);
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double get maxScale => _scaleForLevel(_maxScale).clamp(minScale, double.infinity);
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double get initialScale => _scaleForLevel(_initialScale).clamp(minScale, maxScale);
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Offset toChildPosition(MagnifierController controller, Offset viewportPosition) {
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final position = controller.position;
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final scale = controller.scale;
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final viewportCenter = viewportSize.center(Offset.zero);
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final childCenter = childSize.center(Offset.zero);
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final childPosition = (viewportPosition - viewportCenter) / scale - position / scale + childCenter;
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return childPosition;
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}
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@override
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bool operator ==(Object other) => identical(this, other) || other is ScaleBoundaries && runtimeType == other.runtimeType && _minScale == other._minScale && _maxScale == other._maxScale && _initialScale == other._initialScale && viewportSize == other.viewportSize && childSize == other.childSize;
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@override
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int get hashCode => hashValues(_minScale, _maxScale, _initialScale, viewportSize, childSize);
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@override
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String toString() => '$runtimeType#${shortHash(this)}{viewportSize=$viewportSize, childSize=$childSize, initialScale=$initialScale, minScale=$minScale, maxScale=$maxScale}';
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}
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