Extra blank space when NSTextField is in editing mode - swift

Question

I made an NSTextField subclass which adjusts its width with its content length. The idea (of overriding intrinsicContentSize) is from this question.
override var intrinsicContentSize: NSSize {
if isEditing {
if let fieldEditor =
self.window?.fieldEditor(false, for: self) as?
NSTextView
{
let rect = fieldEditor.layoutManager!.usedRect(
for: fieldEditor.textContainer!
)
let size = rect.size
return size
}
}
let size = self.cell!.cellSize
return size
}
However, there's an extra blank area after the last character. If I set the size.width manually (size.width -= 3.5, for example), the text will offset back and forth (horizontally) during editing.
I don't see this quirk in macOS's Finder when renaming its sidebar items. How to get rid of the extra space without making the text "jumping"?
Update 1:
I added a demo on GitHub.
Update 2:
Tried setting NSTextView's textContainerInset to a size of 0, 0, which doesn't solve the problem.
Update 3:
Updated the repo with #Михаил Масло 's answer. The text still jiggles during editing. The original implementation can be viewed by checking out the initial commit.

Answer 1

You can calculate size of the string with defined font directly try this (I've used your code in TableTextField.swift):
class TableTextField: NSTextField {
...
override var intrinsicContentSize: NSSize {
return stringValue.size(withConstraintedHeight: 1000, font: fieldEditor.font!)
}
...
}
extension String {
func size(withConstraintedHeight height: CGFloat, font: NSFont) -> CGSize {
let constraintRect = CGSize(width: .greatestFiniteMagnitude, height: height)
let boundingBox = self.boundingRect(with: constraintRect, options: .usesLineFragmentOrigin,
attributes: [NSAttributedStringKey.font: font], context: nil)
let size = boundingBox.size
return CGSize(width: size.width + 0.5, height: size.height)
}
}
I didn't tend to make it safe so probably you can make it better and exclude force-unwrap and following errors