110 lines
3.8 KiB
Dart
110 lines
3.8 KiB
Dart
import 'package:aves/model/source/section_keys.dart';
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import 'package:aves/widgets/common/grid/sections/fixed/list_layout.dart';
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import 'package:aves/widgets/common/grid/sections/fixed/row.dart';
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import 'package:aves/widgets/common/grid/sections/fixed/section_layout.dart';
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import 'package:aves/widgets/common/grid/sections/list_layout.dart';
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import 'package:aves/widgets/common/grid/sections/section_layout.dart';
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import 'package:aves/widgets/common/grid/sections/section_layout_builder.dart';
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import 'package:flutter/material.dart';
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import 'package:tuple/tuple.dart';
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class FixedExtentSectionLayoutBuilder<T> extends SectionLayoutBuilder<T> {
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int _currentIndex = 0;
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double _currentOffset = 0;
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List<Size> _itemSizes;
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FixedExtentSectionLayoutBuilder({
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required super.sections,
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required super.showHeaders,
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required super.getHeaderExtent,
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required super.buildHeader,
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required super.scrollableWidth,
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required super.tileLayout,
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required super.columnCount,
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required super.spacing,
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required super.horizontalPadding,
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required super.tileWidth,
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required super.tileHeight,
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required super.tileBuilder,
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required super.tileAnimationDelay,
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}) : _itemSizes = List.generate(columnCount, (index) => Size(tileWidth, tileHeight));
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@override
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SectionedListLayout<T> updateLayouts(BuildContext context) {
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final sectionLayouts = sections.keys
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.map((sectionKey) => buildSectionLayout(
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headerExtent: showHeaders ? getHeaderExtent(context, sectionKey) : 0.0,
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sectionKey: sectionKey,
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section: sections[sectionKey]!,
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animate: animate,
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))
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.toList();
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return FixedExtentSectionedListLayout<T>(
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sections: sections,
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showHeaders: showHeaders,
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columnCount: columnCount,
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tileWidth: tileWidth,
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tileHeight: tileHeight,
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spacing: spacing,
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horizontalPadding: horizontalPadding,
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sectionLayouts: sectionLayouts,
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);
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}
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@override
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SectionLayout buildSectionLayout({
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required double headerExtent,
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required SectionKey sectionKey,
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required List<T> section,
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required bool animate,
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}) {
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final sectionItemCount = section.length;
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final rowCount = (sectionItemCount / columnCount).ceil();
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final sectionChildCount = 1 + rowCount;
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final sectionFirstIndex = _currentIndex;
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_currentIndex += sectionChildCount;
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final sectionLastIndex = _currentIndex - 1;
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final sectionMinOffset = _currentOffset;
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_currentOffset += headerExtent + tileHeight * rowCount + spacing * (rowCount - 1);
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final sectionMaxOffset = _currentOffset;
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return FixedExtentSectionLayout(
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sectionKey: sectionKey,
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firstIndex: sectionFirstIndex,
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lastIndex: sectionLastIndex,
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minOffset: sectionMinOffset,
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maxOffset: sectionMaxOffset,
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headerExtent: headerExtent,
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tileHeight: tileHeight,
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spacing: spacing,
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builder: (context, listIndex) {
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final textDirection = Directionality.of(context);
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final sectionChildIndex = listIndex - sectionFirstIndex;
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return buildSectionWidget(
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context: context,
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section: section,
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sectionGridIndex: listIndex * columnCount,
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sectionChildIndex: sectionChildIndex,
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itemIndexRange: () => Tuple2(
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(sectionChildIndex - 1) * columnCount,
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sectionChildIndex * columnCount,
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),
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sectionKey: sectionKey,
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headerExtent: headerExtent,
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itemSizes: _itemSizes,
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animate: animate,
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buildGridRow: (children) => FixedExtentGridRow(
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width: tileWidth,
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height: tileHeight,
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spacing: spacing,
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textDirection: textDirection,
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children: children,
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),
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);
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},
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);
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}
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}
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