NetNewsWire/iOS/MasterFeed/Cell/MasterFeedTableViewSectionHeaderLayout.swift

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//
// MasterFeedTableViewSectionHeaderLayout.swift
// NetNewsWire-iOS
//
// Created by Maurice Parker on 11/5/19.
// Copyright © 2019 Ranchero Software. All rights reserved.
//
import UIKit
import RSCore
struct MasterFeedTableViewSectionHeaderLayout {
private static let labelMarginRight = CGFloat(integerLiteral: 8)
private static let unreadCountMarginRight = CGFloat(integerLiteral: 16)
private static let disclosureButtonSize = CGSize(width: 44, height: 44)
private static let verticalPadding = CGFloat(integerLiteral: 11)
private static let minRowHeight = CGFloat(integerLiteral: 44)
let titleRect: CGRect
let unreadCountRect: CGRect
let disclosureButtonRect: CGRect
let height: CGFloat
init(cellWidth: CGFloat, insets: UIEdgeInsets, label: UILabel, unreadCountView: MasterFeedUnreadCountView) {
let bounds = CGRect(x: insets.left, y: 0.0, width: floor(cellWidth - insets.right), height: 0.0)
// Disclosure Button
var rDisclosure = CGRect.zero
rDisclosure.size = MasterFeedTableViewSectionHeaderLayout.disclosureButtonSize
rDisclosure.origin.x = bounds.origin.x
// 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 - (MasterFeedTableViewSectionHeaderLayout.unreadCountMarginRight + unreadCountSize.width)
}
// Max Unread Count
// We can't reload Section Headers so we don't let the title extend into the (probably) worse case Unread Count area.
let maxUnreadCountView = MasterFeedUnreadCountView(frame: CGRect.zero)
maxUnreadCountView.unreadCount = 888
let maxUnreadCountSize = maxUnreadCountView.contentSize
// Title
let rLabelx = insets.left + MasterFeedTableViewSectionHeaderLayout.disclosureButtonSize.width
let rLabely = UIFontMetrics.default.scaledValue(for: MasterFeedTableViewSectionHeaderLayout.verticalPadding)
var labelWidth = CGFloat.zero
labelWidth = cellWidth - (rLabelx + MasterFeedTableViewSectionHeaderLayout.labelMarginRight + maxUnreadCountSize.width + MasterFeedTableViewSectionHeaderLayout.unreadCountMarginRight)
let labelSizeInfo = MultilineUILabelSizer.size(for: label.text ?? "", font: label.font, numberOfLines: 0, width: Int(floor(labelWidth)))
var rLabel = CGRect(x: rLabelx, y: rLabely, width: labelWidth, height: labelSizeInfo.size.height)
// Determine cell height
let paddedLabelHeight = rLabel.maxY + UIFontMetrics.default.scaledValue(for: MasterFeedTableViewSectionHeaderLayout.verticalPadding)
let maxGraphicsHeight = [rUnread, rDisclosure].maxY()
var cellHeight = max(paddedLabelHeight, maxGraphicsHeight)
if cellHeight < MasterFeedTableViewSectionHeaderLayout.minRowHeight {
cellHeight = MasterFeedTableViewSectionHeaderLayout.minRowHeight
}
// Center in Cell
let newBounds = CGRect(x: bounds.origin.x, y: bounds.origin.y, width: bounds.width, height: cellHeight)
if !unreadCountIsHidden {
rUnread = MasterFeedTableViewCellLayout.centerVertically(rUnread, newBounds)
}
rDisclosure = MasterFeedTableViewCellLayout.centerVertically(rDisclosure, newBounds)
// Small fonts need centered if we hit the minimum row height
if cellHeight == MasterFeedTableViewSectionHeaderLayout.minRowHeight {
rLabel = MasterFeedTableViewCellLayout.centerVertically(rLabel, newBounds)
}
// Assign the properties
self.height = cellHeight
self.unreadCountRect = rUnread
self.disclosureButtonRect = rDisclosure
self.titleRect = rLabel
}
}