NetNewsWire/iOS/MasterFeed/Cell/MasterFeedTableViewCellLayo...

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Swift
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//
// MasterTableViewCellLayout.swift
// NetNewsWire
//
// Created by Brent Simmons on 11/24/17.
// Copyright © 2017 Ranchero Software. All rights reserved.
//
import UIKit
import RSCore
struct MasterFeedTableViewCellLayout {
private static let editingControlIndent = CGFloat(integerLiteral: 40)
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private static let imageSize = CGSize(width: 20, height: 20)
private static let marginLeft = CGFloat(integerLiteral: 8)
private static let imageMarginRight = CGFloat(integerLiteral: 8)
private static let unreadCountMarginLeft = CGFloat(integerLiteral: 8)
private static let unreadCountMarginRight = CGFloat(integerLiteral: 0)
private static let disclosureButtonSize = CGSize(width: 44, height: 44)
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private static let minRowHeight = CGFloat(integerLiteral: 44)
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let faviconRect: CGRect
let titleRect: CGRect
let unreadCountRect: CGRect
let disclosureButtonRect: CGRect
let separatorInsets: UIEdgeInsets
let height: CGFloat
init(cellWidth: CGFloat, insets: UIEdgeInsets, shouldShowImage: Bool, label: UILabel, unreadCountView: MasterFeedUnreadCountView, showingEditingControl: Bool, indent: Bool, shouldShowDisclosure: Bool) {
var initialIndent = MasterFeedTableViewCellLayout.marginLeft + insets.left
if indent {
initialIndent += MasterFeedTableViewCellLayout.imageSize.width + MasterFeedTableViewCellLayout.imageMarginRight
}
if showingEditingControl {
initialIndent += MasterFeedTableViewCellLayout.editingControlIndent
}
let bounds = CGRect(x: initialIndent, y: 0.0, width: floor(cellWidth - initialIndent - insets.right), height: 0.0)
// Favicon
var rFavicon = CGRect.zero
if shouldShowImage {
let y = UIFontMetrics.default.scaledValue(for: CGFloat(integerLiteral: 4))
rFavicon = CGRect(x: bounds.origin.x, y: y, width: MasterFeedTableViewCellLayout.imageSize.width, height: MasterFeedTableViewCellLayout.imageSize.height)
}
// Separator Insets
separatorInsets = UIEdgeInsets(top: 0, left: rFavicon.maxX + MasterFeedTableViewCellLayout.imageMarginRight, bottom: 0, right: 0)
// Unread Count
let unreadCountSize = unreadCountView.contentSize
let unreadCountIsHidden = unreadCountView.unreadCount < 1
var rUnread = CGRect.zero
if !unreadCountIsHidden {
rUnread.size = unreadCountSize
rUnread.origin.x = bounds.maxX -
(unreadCountSize.width + MasterFeedTableViewCellLayout.unreadCountMarginRight + MasterFeedTableViewCellLayout.disclosureButtonSize.width)
}
// Disclosure Button
var rDisclosure = CGRect.zero
if shouldShowDisclosure {
rDisclosure.size = MasterFeedTableViewCellLayout.disclosureButtonSize
rDisclosure.origin.x = bounds.maxX - MasterFeedTableViewCellLayout.disclosureButtonSize.width
}
// Title
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let labelWidth = bounds.width - (rFavicon.width + MasterFeedTableViewCellLayout.imageMarginRight + MasterFeedTableViewCellLayout.unreadCountMarginLeft + rUnread.width + MasterFeedTableViewCellLayout.unreadCountMarginRight + MasterFeedTableViewCellLayout.disclosureButtonSize.width)
let labelSizeInfo = MultilineUILabelSizer.size(for: label.text ?? "", font: label.font, numberOfLines: 0, width: Int(floor(labelWidth)))
var rLabel = CGRect(x: 0.0, y: 0.0, width: labelSizeInfo.size.width, height: labelSizeInfo.size.height)
if shouldShowImage {
rLabel.origin.x = rFavicon.maxX + MasterFeedTableViewCellLayout.imageMarginRight
} else {
rLabel.origin.x = bounds.minX
}
// Determine cell height
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var cellHeight = [rFavicon, rLabel, rUnread, rDisclosure].maxY()
if cellHeight < MasterFeedTableViewCellLayout.minRowHeight {
cellHeight = MasterFeedTableViewCellLayout.minRowHeight
}
// Center in Cell
let newBounds = CGRect(x: bounds.origin.x, y: bounds.origin.y, width: bounds.width, height: cellHeight)
if shouldShowImage && labelSizeInfo.numberOfLinesUsed == 1 {
rFavicon = MasterFeedTableViewCellLayout.centerVertically(rFavicon, newBounds)
}
if !unreadCountIsHidden {
rUnread = MasterFeedTableViewCellLayout.centerVertically(rUnread, newBounds)
}
if shouldShowDisclosure {
rDisclosure = MasterFeedTableViewCellLayout.centerVertically(rDisclosure, newBounds)
}
rLabel = MasterFeedTableViewCellLayout.centerVertically(rLabel, newBounds)
// Assign the properties
self.height = cellHeight
self.faviconRect = rFavicon
self.unreadCountRect = rUnread
self.disclosureButtonRect = rDisclosure
self.titleRect = rLabel
}
// Ideally this will be implemented in RSCore (see RSGeometry)
static func centerVertically(_ originalRect: CGRect, _ containerRect: CGRect) -> CGRect {
var result = originalRect
result.origin.y = containerRect.midY - (result.height / 2.0)
result = result.integral
result.size = originalRect.size
return result
}
}