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Initial layout work for Home content
https://getpocket.atlassian.net/browse/IN-188 Co-authored-by: David Skuza <dskuza@getpocket.com>
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Sep 23, 2021
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157
PocketKit/Sources/PocketKit/Home/HomeCollectionViewSectionProvider.swift
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,157 @@ | ||
| import UIKit | ||
| import Sync | ||
|
|
||
|
|
||
| class HomeViewControllerSectionProvider { | ||
| func section(for slate: Slate?, width: CGFloat) -> NSCollectionLayoutSection { | ||
| let dividerHeight: CGFloat = 17 | ||
| let margin: CGFloat = 8 | ||
| let spacing: CGFloat = margin * 2 | ||
|
|
||
| guard let slate = slate, !slate.recommendations.isEmpty else { | ||
| return NSCollectionLayoutSection( | ||
| group: .vertical( | ||
| layoutSize: NSCollectionLayoutSize( | ||
| widthDimension: .absolute(0), | ||
| heightDimension: .absolute(0) | ||
| ), | ||
| subitems: [] | ||
| ) | ||
| ) | ||
| } | ||
|
|
||
| let hero = RecommendationPresenter(recommendation: slate.recommendations[0]) | ||
| let heroHeight = RecommendationCell.fullHeight(width: width - spacing, recommendation: hero) | ||
| let heroItem = NSCollectionLayoutItem( | ||
| layoutSize: NSCollectionLayoutSize( | ||
| widthDimension: .fractionalWidth(1), | ||
| heightDimension: .absolute(heroHeight) | ||
| ) | ||
| ) | ||
|
|
||
| let heroGroup = NSCollectionLayoutGroup.vertical( | ||
| layoutSize: NSCollectionLayoutSize( | ||
| widthDimension: .fractionalWidth(1), | ||
| heightDimension: .absolute(heroHeight + dividerHeight) | ||
| ), | ||
| subitems: [heroItem] | ||
| ) | ||
|
|
||
| heroGroup.supplementaryItems = [ | ||
| NSCollectionLayoutSupplementaryItem( | ||
| layoutSize: NSCollectionLayoutSize( | ||
| widthDimension: .fractionalWidth(1), | ||
| heightDimension: .absolute(dividerHeight) | ||
| ), | ||
| elementKind: "divider", | ||
| containerAnchor: NSCollectionLayoutAnchor(edges: .bottom) | ||
| ) | ||
| ] | ||
|
|
||
| let twoUp = twoUpGroup(slate: slate, width: width, spacing: spacing, dividerHeight: dividerHeight) | ||
|
|
||
| let topLevelGroup = NSCollectionLayoutGroup.vertical( | ||
| layoutSize: NSCollectionLayoutSize( | ||
| widthDimension: .fractionalWidth(1), | ||
| heightDimension: .absolute(heroHeight + dividerHeight + (twoUp.height + dividerHeight) * 2) | ||
| ), | ||
| subitems: [heroGroup, twoUp.group] | ||
| ) | ||
|
|
||
| let section = NSCollectionLayoutSection(group: topLevelGroup) | ||
| let slatePresenter = SlateHeaderPresenter(slate: slate) | ||
|
|
||
| section.boundarySupplementaryItems = [ | ||
| NSCollectionLayoutBoundarySupplementaryItem( | ||
| layoutSize: NSCollectionLayoutSize( | ||
| widthDimension: .fractionalWidth(1.0), | ||
| heightDimension: .absolute(SlateHeaderView.height(width: width, slate: slatePresenter)) | ||
| ), | ||
| elementKind: SlateHeaderView.kind, | ||
| alignment: .top | ||
| ) | ||
| ] | ||
|
|
||
| section.contentInsets = NSDirectionalEdgeInsets( | ||
| top: 0, | ||
| leading: margin, | ||
| bottom: 0, | ||
| trailing: margin | ||
| ) | ||
|
|
||
| return section | ||
| } | ||
|
|
||
| func twoUpGroup( | ||
| slate: Slate, | ||
| width: CGFloat, | ||
| spacing: CGFloat, | ||
| dividerHeight: CGFloat | ||
| ) -> (group: NSCollectionLayoutGroup, height: CGFloat) { | ||
| guard slate.recommendations.count > 1 else { | ||
| return ( | ||
| group: NSCollectionLayoutGroup.vertical( | ||
| layoutSize: NSCollectionLayoutSize( | ||
| widthDimension: .absolute(0), | ||
| heightDimension: .absolute(0) | ||
| ), | ||
| subitems: [] | ||
| ), | ||
| height: 0 | ||
| ) | ||
| } | ||
|
|
||
| let endIndex = slate.recommendations.index( | ||
| 1, | ||
| offsetBy: 3, | ||
| limitedBy: slate.recommendations.endIndex - 1 | ||
| ) ?? slate.recommendations.endIndex - 1 | ||
| let recommendationsToShow = slate.recommendations[1...endIndex] | ||
|
|
||
| let miniCardHeight = recommendationsToShow.map { | ||
| RecommendationCell.miniHeight( | ||
| width: width - spacing, | ||
| recommendation: RecommendationPresenter(recommendation: $0) | ||
| ) | ||
| }.max() ?? 0 | ||
|
|
||
| let twoUpInner = NSCollectionLayoutGroup.horizontal( | ||
| layoutSize: NSCollectionLayoutSize( | ||
| widthDimension: .fractionalWidth(1), | ||
| heightDimension: .absolute(miniCardHeight) | ||
| ), | ||
| subitem: NSCollectionLayoutItem( | ||
| layoutSize: NSCollectionLayoutSize( | ||
| widthDimension: .fractionalWidth(0.5), | ||
| heightDimension: .absolute(miniCardHeight) | ||
| ) | ||
| ), | ||
| count: 2 | ||
| ) | ||
|
|
||
| twoUpInner.supplementaryItems = [ | ||
| NSCollectionLayoutSupplementaryItem( | ||
| layoutSize: NSCollectionLayoutSize( | ||
| widthDimension: .fractionalWidth(1), | ||
| heightDimension: .absolute(dividerHeight) | ||
| ), | ||
| elementKind: "twoup-divider", | ||
| containerAnchor: NSCollectionLayoutAnchor(edges: .bottom), | ||
| itemAnchor: NSCollectionLayoutAnchor(edges: .bottom) | ||
| ) | ||
| ] | ||
|
|
||
| let numberOfRows = Int((Float(recommendationsToShow.count) / 2).rounded(.up)) | ||
| return ( | ||
| group: NSCollectionLayoutGroup.vertical( | ||
| layoutSize: NSCollectionLayoutSize( | ||
| widthDimension: .fractionalWidth(1), | ||
| heightDimension: .absolute((miniCardHeight + dividerHeight) * 2) | ||
| ), | ||
| subitem: twoUpInner, | ||
| count: numberOfRows | ||
| ), | ||
| height: miniCardHeight | ||
| ) | ||
| } | ||
| } |
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