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"given this many pixels and a string with these attributes, tell me the optimal places to do a line break" https://iosdevelopers.slack.com/archives/C1GPPBMHC/p1697470218613869?thread_ts=1697467894.270959&cid=C1GPPBMHC
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import Cocoa | |
/// "given this many pixels and a string with these attributes, tell me the optimal places to do a line break" | |
class LineBreakPropose: NSObject, NSTextLayoutManagerDelegate { | |
var lineBreaks: [NSTextLocation] = [] | |
init(_ attributedString: NSAttributedString, in size: CGSize, by lineBreakMode: NSLineBreakMode = .byWordWrapping) { | |
super.init() | |
let textContentManager = NSTextContentStorage() | |
// Layout | |
let textLayoutManager = NSTextLayoutManager() | |
textLayoutManager.delegate = self | |
textContentManager.addTextLayoutManager(textLayoutManager) | |
textContentManager.primaryTextLayoutManager = textLayoutManager | |
let textContainer = NSTextContainer() | |
textLayoutManager.textContainer = textContainer | |
textContainer.lineFragmentPadding = 0 | |
textContainer.lineBreakMode = lineBreakMode | |
textContainer.size = size | |
textContentManager.attributedString = attributedString //NSAttributedString(string: "0123456789 0123456789 012") | |
textLayoutManager.ensureLayout(for: textContentManager.documentRange) | |
} | |
func textLayoutManager(_ textLayoutManager: NSTextLayoutManager, shouldBreakLineBefore location: NSTextLocation, hyphenating: Bool) -> Bool { | |
lineBreaks.append(location) | |
return true | |
} | |
} | |
let breakLocations = LineBreakPropose(NSAttributedString(string: "0123456789 0123456789 012"), in: CGSize(width: 40, height: 10000)).lineBreaks | |
print(breakLocations) |
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