39 lines
1.3 KiB
Dart
39 lines
1.3 KiB
Dart
import 'package:aves/model/settings.dart';
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import 'package:flutter/widgets.dart';
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import 'package:tuple/tuple.dart';
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class TileExtentManager {
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static const columnCountMin = 2;
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static const columnCountDefault = 4;
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static const columnCountMax = 8;
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static double applyTileExtent(Size mqSize, EdgeInsets mqPadding, ValueNotifier<double> extentNotifier, {double newExtent}) {
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final availableWidth = mqSize.width - mqPadding.horizontal;
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var numColumns;
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if ((newExtent ?? 0) == 0) {
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newExtent = extentNotifier.value;
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}
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if ((newExtent ?? 0) == 0) {
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newExtent = settings.collectionTileExtent;
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}
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if ((newExtent ?? 0) == 0) {
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numColumns = columnCountDefault;
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} else {
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final minMax = extentBoundsForSize(mqSize);
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newExtent = newExtent.clamp(minMax.item1, minMax.item2);
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numColumns = (availableWidth / newExtent).round().clamp(columnCountMin, columnCountMax);
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}
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newExtent = availableWidth / numColumns;
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if (extentNotifier.value != newExtent) {
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settings.collectionTileExtent = newExtent;
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extentNotifier.value = newExtent;
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}
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return newExtent;
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}
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static Tuple2<double, double> extentBoundsForSize(Size mqSize) {
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final min = mqSize.shortestSide / columnCountMax;
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final max = mqSize.shortestSide / columnCountMin;
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return Tuple2(min, max);
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}
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}
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