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