---
title: "boundingBox(forControlGlyphAt:for:proposedLineFragment:glyphPosition:characterIndex:)"
framework: appkit
role: symbol
role_heading: Instance Method
path: "appkit/nstypesetter/boundingbox(forcontrolglyphat:for:proposedlinefragment:glyphposition:characterindex:)"
---

# boundingBox(forControlGlyphAt:for:proposedLineFragment:glyphPosition:characterIndex:)

Returns the bounding rectangle for the specified control glyph with the specified parameters.

## Declaration

```swift
func boundingBox(forControlGlyphAt glyphIndex: Int, for textContainer: NSTextContainer, proposedLineFragment proposedRect: NSRect, glyphPosition: NSPoint, characterIndex charIndex: Int) -> NSRect
```

## Parameters

- `glyphIndex`: The index of the control glyph in question.
- `textContainer`: The text container to use to calculate the position.
- `proposedRect`: The proposed line fragment rectangle.
- `glyphPosition`: The position of the glyph in textContainer.
- `charIndex`: The character index in textContainer.

## Return Value

Return Value The bounding rectangle of the control glyph at glyphIndex, at the given glyphPosition and character index charIndex, in textContainer.

## Discussion

Discussion The typesetter calls this method when it encounters a control glyph. The default behavior is to return zero width for control glyphs. A subclass can override this method to do something different, such as implement a way to display control characters. NSGlyphGenerator can choose whether or not to map control characters to NSControlGlyph. Tab characters, for example, do not use this facility.

## See Also

### Laying out glyphs

- [layoutGlyphs(in:startingAtGlyphIndex:maxNumberOfLineFragments:nextGlyphIndex:)](appkit/nstypesetter/layoutglyphs(in:startingatglyphindex:maxnumberoflinefragments:nextglyphindex:).md)
- [getLineFragmentRect(_:usedRect:forParagraphSeparatorGlyphRange:atProposedOrigin:)](appkit/nstypesetter/getlinefragmentrect(_:usedrect:forparagraphseparatorglyphrange:atproposedorigin:).md)
- [getLineFragmentRect(_:usedRect:remaining:forStartingGlyphAt:proposedRect:lineSpacing:paragraphSpacingBefore:paragraphSpacingAfter:)](appkit/nstypesetter/getlinefragmentrect(_:usedrect:remaining:forstartingglyphat:proposedrect:linespacing:paragraphspacingbefore:paragraphspacingafter:).md)
- [hyphenCharacter(forGlyphAt:)](appkit/nstypesetter/hyphencharacter(forglyphat:).md)
- [hyphenationFactor(forGlyphAt:)](appkit/nstypesetter/hyphenationfactor(forglyphat:).md)
- [shouldBreakLine(byHyphenatingBeforeCharacterAt:)](appkit/nstypesetter/shouldbreakline(byhyphenatingbeforecharacterat:).md)
- [shouldBreakLine(byWordBeforeCharacterAt:)](appkit/nstypesetter/shouldbreakline(bywordbeforecharacterat:).md)
- [willSetLineFragmentRect(_:forGlyphRange:usedRect:baselineOffset:)](appkit/nstypesetter/willsetlinefragmentrect(_:forglyphrange:usedrect:baselineoffset:).md)
- [setHardInvalidation(_:forGlyphRange:)](appkit/nstypesetter/sethardinvalidation(_:forglyphrange:).md)