69 lines
2.1 KiB
Swift
69 lines
2.1 KiB
Swift
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// NSAttributedString+NetNewsWire.swift
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// NetNewsWire
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//
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// Created by Nate Weaver on 2020-04-07.
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// Copyright © 2020 Ranchero Software. All rights reserved.
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//
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import AppKit
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extension NSAttributedString {
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func adding(font baseFont: NSFont, color: NSColor? = nil) -> NSAttributedString {
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let mutable = self.mutableCopy() as! NSMutableAttributedString
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let fullRange = NSRange(location: 0, length: mutable.length)
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if let color = color {
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mutable.addAttribute(.foregroundColor, value: color as Any, range: fullRange)
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}
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let size = baseFont.pointSize
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let baseDescriptor = baseFont.fontDescriptor
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let traits = baseDescriptor.symbolicTraits
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mutable.enumerateAttribute(.font, in: fullRange, options: []) { (font: Any?, range: NSRange, stop: UnsafeMutablePointer<ObjCBool>) in
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guard let font = font as? NSFont else { return }
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var newTraits = traits
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if font.fontDescriptor.symbolicTraits.contains(.italic) {
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newTraits.insert(.italic)
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}
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var descriptor = baseDescriptor.withSymbolicTraits(newTraits)
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if font.fontDescriptor.symbolicTraits.contains(.bold) {
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// This currently assumes we're modifying the title field, which is
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// already semibold.
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let traits: [NSFontDescriptor.TraitKey: Any] = [.weight: NSFont.Weight.heavy]
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let attributes: [NSFontDescriptor.AttributeName: Any] = [.traits: traits]
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descriptor = descriptor.addingAttributes(attributes)
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}
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let newFont = NSFont(descriptor: descriptor, size: size)
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mutable.addAttribute(.font, value: newFont as Any, range: range)
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}
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// make sup/sub smaller
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mutable.enumerateAttributes(in: fullRange, options: []) { (attributes: [Key : Any], range: NSRange, stop: UnsafeMutablePointer<ObjCBool>) in
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guard let superscript = attributes[.superscript] as? Int else {
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return
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}
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if superscript != 0 {
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let font = mutable.attribute(.font, at: range.location, effectiveRange: nil) as! NSFont
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let size = font.pointSize * 0.6
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let newFont = NSFont(descriptor: font.fontDescriptor, size: size)
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mutable.addAttribute(.font, value: newFont as Any, range: range)
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}
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}
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return mutable.copy() as! NSAttributedString
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}
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}
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