Support boundingRect(forGlyphRange)

[aaronvegh]

I'm building an app that relies extensively on NSTextView. I've been finding of late that drawing performance (particularly when scrolling and resizing these views) left much to be desired. I was hoping that STTextView could be a good replacement!

Unfortunately, one feature that I'm using, that doesn't seem to be available here, is NSLayoutManager's boundingRect(forGlyphRange) method. I did some spelunking and it seems NSLayoutManager is largely not being used in this project. I can imagine that this request might be a heavy lift.

As for my use case, my application shows an NSView above particular blocks of text. Here's an example:

I derive the bounds of the view by calling that layout manager function to ensure that the view perfectly covers the range of the text at issue.

Let me know if you have any questions! Thank you!

[krzyzanowskim]

STTextView does not use NSLayoutManager (TextKit1) because it uses new NSTextLayoutManager from TextKit2. I think you can use it to get the bounds for the range. The closest you need is probably the helper I use for selection:

NSTextLayoutManager.textSelectionSegmentFrame(in:type:)

STTextView/Sources/STTextView/Extensions/NSTextLayoutManager+Helpers.swift

Line 44 in 81eeabe

public func textSelectionSegmentFrame(in textRange: NSTextRange, type: NSTextLayoutManager.SegmentType) -> CGRect? {

I use it for annotations in the Demo project

STTextView/STTextViewDemo/ViewController.swift

Line 115 in 81eeabe

let segmentFrame = textView.textLayoutManager.textSelectionSegmentFrame(at: lineAnnotation.location, type: .standard)!

let me know if you know how to use it of if you need more help on that?