91 lines
3.5 KiB
Dart
91 lines
3.5 KiB
Dart
import 'dart:math';
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import 'package:aves/model/settings/settings.dart';
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import 'package:flutter/scheduler.dart';
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import 'package:flutter/widgets.dart';
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class TileExtentController {
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final String settingsRouteKey;
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final int columnCountMin, columnCountDefault;
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final double spacing, extentMin, extentMax;
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final ValueNotifier<double> extentNotifier = ValueNotifier(0);
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Size _viewportSize;
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Size get viewportSize => _viewportSize;
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TileExtentController({
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@required this.settingsRouteKey,
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this.columnCountMin = 2,
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@required this.columnCountDefault,
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@required this.extentMin,
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this.extentMax = 300,
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@required this.spacing,
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});
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void setViewportSize(Size viewportSize) {
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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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// dimensions are rounded to prevent updates on minor changes
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// e.g. available space on S10e is `Size(360.0, 721.0)` when status bar is visible, `Size(360.0, 721.3)` when it is not
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final newViewportSize = Size(max(viewportSize.width, viewportSizeMin.width).roundToDouble(), max(viewportSize.height, viewportSizeMin.height).roundToDouble());
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if (_viewportSize != newViewportSize) {
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_viewportSize = newViewportSize;
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_update();
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}
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}
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double setUserPreferredExtent(double userPreferredExtent) => _update(userPreferredExtent: userPreferredExtent);
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double _update({double userPreferredExtent = 0}) {
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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 = _effectiveColumnCountForExtent(targetExtent);
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final newExtent = _extentForColumnCount(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() => min(extentMax, (viewportSize.shortestSide - spacing * (columnCountMin - 1)) / columnCountMin);
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double _columnCountForExtent(double extent) => (viewportSize.width + spacing) / (extent + spacing);
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double _extentForColumnCount(int columnCount) => (viewportSize.width - spacing * (columnCount - 1)) / columnCount;
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int _effectiveColumnCountMin() => _columnCountForExtent(_extentMax()).ceil();
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int _effectiveColumnCountMax() => _columnCountForExtent(extentMin).floor();
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int _effectiveColumnCountForExtent(double extent) {
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if (extent > 0) {
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final columnCount = _columnCountForExtent(extent);
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return columnCount.clamp(_effectiveColumnCountMin(), _effectiveColumnCountMax()).round();
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}
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return columnCountDefault;
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}
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double get effectiveExtentMin => _extentForColumnCount(_effectiveColumnCountMax());
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double get effectiveExtentMax => _extentForColumnCount(_effectiveColumnCountMin());
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int get columnCount => _effectiveColumnCountForExtent(extentNotifier.value);
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Duration getTileAnimationDelay(Duration pageTarget) {
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final extent = extentNotifier.value;
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final columnCount = ((viewportSize.width + spacing) / (extent + spacing)).round();
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final rowCount = (viewportSize.height + spacing) ~/ (extent + spacing);
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return pageTarget ~/ (columnCount + rowCount) * timeDilation;
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}
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}
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