# lineFragmentRect(forProposedRect:at:writingDirection:remaining:) Returns the bounds of a line fragment rectangle inside the text container for the proposed rectangle. ``` func lineFragmentRect(forProposedRect proposedRect: CGRect, at characterIndex: Int, writingDirection baseWritingDirection: NSWritingDirection, remaining remainingRect: UnsafeMutablePointer?) -> CGRect ``` ## Parameters `proposedRect` A rectangle in which to lay out text proposed by the layout manager. `characterIndex` The character location inside the text storage for the line fragment being processed. `baseWritingDirection` The direction of advancement for line fragments inside a visual horizontal line. The values passed into the method are either [`NSWritingDirection.leftToRight`](/documentation/AppKit/NSWritingDirection/leftToRight) or [`NSWritingDirection.rightToLeft`](/documentation/AppKit/NSWritingDirection/rightToLeft). `remainingRect` The remainder of the proposed rectangle that was excluded from returned rectangle. It can be passed in as the proposed rectangle for the next iteration. ## Discussion The bounds of the line fragment rectangle are determined by the intersection of `proposedRect` and the text container’s bounding rectangle defined by its [`NSTextContainer`](/documentation/AppKit/NSTextContainer) property. The regions defined by the [`NSTextContainer`](/documentation/AppKit/NSTextContainer) property are excluded from the return value. It is possible that `proposedRect` can be divided into multiple line fragments due to exclusion paths. In that case, `remainingRect` returns the remainder that can be passed in as the proposed rectangle for the next iteration. This method can be overridden by subclasses for further text container region customization. --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)