NetNewsWire/Mac/MainWindow/Timeline/Cell/SingleLineTextFieldSizer.swift
2024-03-19 23:05:30 -07:00

66 lines
1.9 KiB
Swift
Raw Blame History

This file contains ambiguous Unicode characters

This file contains Unicode characters that might be confused with other characters. If you think that this is intentional, you can safely ignore this warning. Use the Escape button to reveal them.

//
// SingleLineTextFieldSizer.swift
// NetNewsWire
//
// Created by Brent Simmons on 2/19/18.
// Copyright © 2018 Ranchero Software. All rights reserved.
//
import AppKit
// Get the size of an NSTextField configured with a specific font with a specific size.
// Uses a cache.
// Main thready only.
@MainActor final class SingleLineTextFieldSizer {
let font: NSFont
private let textField: NSTextField
private var cache = [String: NSSize]()
/// Get the NSTextField size for text, given a font.
static func size(for text: String, font: NSFont) -> NSSize {
return sizer(for: font).size(for: text)
}
init(font: NSFont) {
self.textField = NSTextField(labelWithString: "")
self.textField.font = font
self.font = font
}
func size(for text: String) -> NSSize {
if let cachedSize = cache[text] {
return cachedSize
}
textField.stringValue = text
var calculatedSize = textField.fittingSize
calculatedSize.height = ceil(calculatedSize.height)
calculatedSize.width = ceil(calculatedSize.width)
cache[text] = calculatedSize
return calculatedSize
}
static private var sizers = [SingleLineTextFieldSizer]()
static private func sizer(for font: NSFont) -> SingleLineTextFieldSizer {
// We used to use an [NSFont: SingleLineTextFieldSizer] dictionary
// until, in 10.14.5, we started getting crashes with the message:
// Fatal error: Duplicate keys of type 'NSFont' were found in a Dictionary.
// This usually means either that the type violates Hashable's requirements, or
// that members of such a dictionary were mutated after insertion.
// We use just an array of sizers now which is totally fine,
// because theres only going to be like three of them.
if let cachedSizer = sizers.first(where: { $0.font == font }) {
return cachedSizer
}
let newSizer = SingleLineTextFieldSizer(font: font)
sizers.append(newSizer)
return newSizer
}
}