line-number-from-char

Arguments: stream character-index

Returns an integer indicating the line of text in which the character-index'th character appears. The returned value 0 indicates the first line of text. character-index should be a non-negative integer (not a character object) indicating a number of characters from the beginning of the text. The value 0 indicates the first character. stream can be a multi-line-editable-text control, or a text-edit-pane.

The character index pertains to the string that is in the control, which may differ from a Lisp string that was placed into the control programmatically by calling set-text. In particular, the Windows multi-line text-editing control that is currently used by Common Graphics (implementing, e.g., the multi-line-editable-text control) always contains a Carriage Return/Linefeed pair to separate lines of text, where a Lisp string has a single newline character. Text is converted automatically when it is added to or copied from the control.

See also char-from-line-number.

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Created 2015.5.21.