72 lines
2.3 KiB
Dart
72 lines
2.3 KiB
Dart
import 'dart:math';
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import 'package:flutter/material.dart';
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import 'package:photos/models/collection/collection.dart';
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import "package:photos/ui/collections/album/row_item.dart";
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class CollectionsFlexiGridViewWidget extends StatelessWidget {
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/*
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Aspect ratio 1:1 Max width 224 Fixed gap 8
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Width changes dynamically with screen width such that we can fit 2 in one row.
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Keep the width integral (center the albums to distribute excess pixels)
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*/
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static const maxThumbnailWidth = 224.0;
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static const fixedGapBetweenAlbum = 8.0;
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static const minGapForHorizontalPadding = 8.0;
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static const collectionItemsToPreload = 20;
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final List<Collection>? collections;
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// At max how many albums to display
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final int displayLimitCount;
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// If true, the GridView will shrink-wrap its contents.
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final bool shrinkWrap;
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final String tag;
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const CollectionsFlexiGridViewWidget(
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this.collections, {
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this.displayLimitCount = 10,
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this.shrinkWrap = false,
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this.tag = "",
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Key? key,
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}) : super(key: key);
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@override
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Widget build(BuildContext context) {
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final double screenWidth = MediaQuery.of(context).size.width;
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final int albumsCountInOneRow = max(screenWidth ~/ maxThumbnailWidth, 2);
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final double gapBetweenAlbums =
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(albumsCountInOneRow - 1) * fixedGapBetweenAlbum;
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// gapOnSizeOfAlbums will be
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final double gapOnSizeOfAlbums = minGapForHorizontalPadding +
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(screenWidth - gapBetweenAlbums - (2 * minGapForHorizontalPadding)) %
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albumsCountInOneRow;
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final double sideOfThumbnail =
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(screenWidth - gapOnSizeOfAlbums - gapBetweenAlbums) /
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albumsCountInOneRow;
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return SliverPadding(
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padding: const EdgeInsets.all(8),
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sliver: SliverGrid(
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delegate: SliverChildBuilderDelegate(
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(context, index) {
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return AlbumRowItemWidget(
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collections![index],
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sideOfThumbnail,
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tag: tag,
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);
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},
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childCount: min(collections!.length, displayLimitCount),
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),
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gridDelegate: SliverGridDelegateWithFixedCrossAxisCount(
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crossAxisCount: albumsCountInOneRow,
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mainAxisSpacing: 4,
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crossAxisSpacing: gapBetweenAlbums,
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childAspectRatio: sideOfThumbnail / (sideOfThumbnail + 46),
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),
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),
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);
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}
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}
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