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Allegro CL version 8.1
Unrevised from 8.0 to 8.1.
8.0 version

position-of-character-index

Arguments: text-edit-pane index &key bottom position-to-return

Returns the pixel position of the character at index in text-edit-pane.

The returned position object is in stream coordinates, meaning that it is measured from the upper-left corner of the scrollable contents of the window, and so the value will not be affected by the current scroll-position of the window.

text-edit-pane should be a text-edit-pane or rich-edit-pane.

index should be a non-negative integer indicating a character, where 0 indicates the first character in the window, (file-position text-edit-pane) indicates the character immediately to the right of the text cursor, and (file-length text-edit-pane) indicates the hypothetical character just after the last character. (See file-position and file-length.)

If bottom is nil, as it is by default, then the returned position is of the upper-left corner of the character cell. If bottom is true, then it is the lower-left corner instead.

If position-to-return is nil, as it is by default, then a new position object is consed and returned. Otherwise position-to-return may be a position object, in which case it is filled in and returned in order to avoid consing a position object.

For a text-edit-pane with a fixed-width font, the returned value could alternately be derived by calling such functions as line-height, line-number-from-char, and char-from-line-number. So this function is most useful for a rich-edit-pane, which typically has differing line heights and character widths.

See also character-index-at-position.

This example would return the pixel position of the bottom-right corner of the very last character's character cell:

(position-of-character-index
  my-text-edit-pane (file-length my-text-edit-pane)
  :bottom t)

Copyright (c) 1998-2009, Franz Inc. Oakland, CA., USA. All rights reserved.
Documentation for Allegro CL version 8.1. This page was not revised from the 8.0 page.
Created 2009.7.29.

ToCDocOverviewCGDocRelNotesFAQIndexPermutedIndex
Allegro CL version 8.1
Unrevised from 8.0 to 8.1.
8.0 version