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Fix crashing bug by not using an NSFont as a key in a Swift dictionary. Fix #734.

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This commit is contained in:
Brent Simmons 2019-06-09 16:03:08 -07:00
parent 941dd5fa08
commit 4a4fa6ed0e
1 changed files with 16 additions and 19 deletions
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35
Mac/MainWindow/Timeline/Cell/SingleLineTextFieldSizer.swift
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@ -18,15 +18,18 @@ final class SingleLineTextFieldSizer {
private let textField: NSTextField
private var cache = [String: NSSize]()
init(font: NSFont) {
/// 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
}
@ -40,29 +43,23 @@ final class SingleLineTextFieldSizer {
return calculatedSize
}
static private var sizers = [NSFont: SingleLineTextFieldSizer]()
static private var sizers = [SingleLineTextFieldSizer]()
static func sizer(for font: NSFont) -> SingleLineTextFieldSizer {
if let cachedSizer = sizers[font] {
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 there’s only going to be like three of them.
if let cachedSizer = sizers.firstElementPassingTest({ $0.font == font }) {
return cachedSizer
}
let newSizer = SingleLineTextFieldSizer(font: font)
sizers[font] = newSizer
sizers.append(newSizer)
return newSizer
}
// Use this call. It’s easiest.
static func size(for text: String, font: NSFont) -> NSSize {
return sizer(for: font).size(for: text)
}
static func emptyCache() {
sizers = [NSFont: SingleLineTextFieldSizer]()
}
}