From 754bbf7a25a8dda49b5d08ef0d0443bbf5af0e36 Mon Sep 17 00:00:00 2001 From: Craig Jennings Date: Sun, 7 Apr 2024 13:41:34 -0500 Subject: new repository --- devdocs/elisp/overlays.html | 21 +++++++++++++++++++++ 1 file changed, 21 insertions(+) create mode 100644 devdocs/elisp/overlays.html (limited to 'devdocs/elisp/overlays.html') diff --git a/devdocs/elisp/overlays.html b/devdocs/elisp/overlays.html new file mode 100644 index 00000000..56486b3b --- /dev/null +++ b/devdocs/elisp/overlays.html @@ -0,0 +1,21 @@ +

Overlays

You can use overlays to alter the appearance of a buffer’s text on the screen, for the sake of presentation features. An overlay is an object that belongs to a particular buffer, and has a specified beginning and end. It also has properties that you can examine and set; these affect the display of the text within the overlay.

The visual effect of an overlay is the same as of the corresponding text property (see Text Properties). However, due to a different implementation, overlays generally don’t scale well (many operations take a time that is proportional to the number of overlays in the buffer). If you need to affect the visual appearance of many portions in the buffer, we recommend using text properties.

An overlay uses markers to record its beginning and end; thus, editing the text of the buffer adjusts the beginning and end of each overlay so that it stays with the text. When you create the overlay, you can specify whether text inserted at the beginning should be inside the overlay or outside, and likewise for the end of the overlay.

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• Managing Overlays + Creating and moving overlays.
• Overlay Properties + How to read and set properties. What properties do to the screen display.
• Finding Overlays + Searching for overlays.
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+ Copyright © 1990-1996, 1998-2022 Free Software Foundation, Inc.
Licensed under the GNU GPL license.
+ https://www.gnu.org/software/emacs/manual/html_node/elisp/Overlays.html +

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