Legacy Document

Inside Macintosh: Text /

Chapter 3 - QuickDraw Text / QuickDraw Text Reference

Routines

Determining the Caret Position, and Selecting and Highlighting Text

To mark an insertion point you need to know where to draw the caret. To highlight text, you need to know the caret positions that begin and end the text range. This section describes routines that you use to locate a caret position for marking an insertion point or highlighting text. You can also use the PixelToChar function to determine where to break a line, and the CharToPixel function to find the screen pixel width of a text segment.

• The PixelToChar function converts a pixel location associated with a glyph in a range of text to a byte offset within the style run.
• The CharToPixel function converts a byte offset to a pixel location. The pixel location is measured from the left edge of the style run.
• The HiliteText procedure returns three pairs of offsets marking the endpoints of ranges of text to be highlighted.

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Subtopics

PixelToChar

CharToPixel

HiliteText