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46 lines
1.4 KiB
Swift
46 lines
1.4 KiB
Swift
//
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// ImageCellHeightCache.swift
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// Freetime
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//
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// Created by Ryan Nystrom on 7/5/17.
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// Copyright © 2017 Ryan Nystrom. All rights reserved.
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//
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import Foundation
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import IGListKit
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final class ImageCellHeightCache: IssueCommentImageHeightCellDelegate {
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// width is unused since the full size of the image is stored
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private static let cache = WidthCache<URL, CGSize>()
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private weak var sectionController: ListSectionController?
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init(sectionController: ListSectionController) {
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self.sectionController = sectionController
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}
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// MARK: Public API
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func height(model: IssueCommentImageModel, width: CGFloat) -> CGFloat {
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guard let size = ImageCellHeightCache.cache.data(key: model.url, width: 0) else { return 200 }
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let ratio = size.width / size.height
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return ceil(width / ratio)
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}
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// MARK: IssueCommentImageHeightCellDelegate
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func imageDidFinishLoad(cell: IssueCommentImageCell, url: URL, size: CGSize) {
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guard let sectionController = self.sectionController,
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sectionController.section != NSNotFound,
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size != ImageCellHeightCache.cache.data(key: url, width: 0)
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else { return }
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ImageCellHeightCache.cache.set(data: size, key: url, width: 0)
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UIView.performWithoutAnimation {
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sectionController.collectionContext?.invalidateLayout(for: sectionController)
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}
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}
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}
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