70 lines
2.8 KiB
Dart
70 lines
2.8 KiB
Dart
import 'dart:math';
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import 'package:aves/model/settings/settings.dart';
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import 'package:flutter/widgets.dart';
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class TileExtentManager {
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final String settingsRouteKey;
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final int columnCountMin, columnCountDefault;
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final double spacing, extentMin;
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final ValueNotifier<double> extentNotifier;
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const TileExtentManager({
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@required this.settingsRouteKey,
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@required this.columnCountMin,
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@required this.columnCountDefault,
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@required this.extentMin,
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@required this.extentNotifier,
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@required this.spacing,
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});
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double applyTileExtent({
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@required Size viewportSize,
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double userPreferredExtent = 0,
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}) {
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// sanitize screen size (useful when reloading while screen is off, reporting a 0,0 size)
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final viewportSizeMin = Size.square(extentMin * columnCountMin);
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viewportSize = Size(max(viewportSize.width, viewportSizeMin.width), max(viewportSize.height, viewportSizeMin.height));
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final oldUserPreferredExtent = settings.getTileExtent(settingsRouteKey);
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final currentExtent = extentNotifier.value;
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final targetExtent = userPreferredExtent > 0
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? userPreferredExtent
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: oldUserPreferredExtent > 0
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? oldUserPreferredExtent
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: currentExtent;
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final columnCount = getEffectiveColumnCountForExtent(viewportSize, targetExtent);
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final newExtent = _extentForColumnCount(viewportSize, columnCount);
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if (userPreferredExtent > 0 || oldUserPreferredExtent == 0) {
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settings.setTileExtent(settingsRouteKey, newExtent);
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}
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if (extentNotifier.value != 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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double _extentMax(Size viewportSize) => (viewportSize.shortestSide - spacing * (columnCountMin - 1)) / columnCountMin;
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double _columnCountForExtent(Size viewportSize, double extent) => (viewportSize.width + spacing) / (extent + spacing);
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double _extentForColumnCount(Size viewportSize, int columnCount) => (viewportSize.width - spacing * (columnCount - 1)) / columnCount;
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int _effectiveColumnCountMin(Size viewportSize) => _columnCountForExtent(viewportSize, _extentMax(viewportSize)).ceil();
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int _effectiveColumnCountMax(Size viewportSize) => _columnCountForExtent(viewportSize, extentMin).floor();
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double getEffectiveExtentMin(Size viewportSize) => _extentForColumnCount(viewportSize, _effectiveColumnCountMax(viewportSize));
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double getEffectiveExtentMax(Size viewportSize) => _extentForColumnCount(viewportSize, _effectiveColumnCountMin(viewportSize));
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int getEffectiveColumnCountForExtent(Size viewportSize, double extent) {
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if (extent > 0) {
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final columnCount = _columnCountForExtent(viewportSize, extent);
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return columnCount.clamp(_effectiveColumnCountMin(viewportSize), _effectiveColumnCountMax(viewportSize)).round();
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}
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return columnCountDefault;
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}
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}
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