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;;; vertico-mouse.el --- Mouse support for Vertico -*- lexical-binding: t -*-
;; Copyright (C) 2021-2025 Free Software Foundation, Inc.
;; Author: Daniel Mendler <mail@daniel-mendler.de>
;; Maintainer: Daniel Mendler <mail@daniel-mendler.de>
;; Created: 2021
;; Version: 2.1
;; Package-Requires: ((emacs "28.1") (compat "30") (vertico "2.1"))
;; URL: https://github.com/minad/vertico
;; This file is part of GNU Emacs.
;; This program is free software: you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation, either version 3 of the License, or
;; (at your option) any later version.
;; This program is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;; GNU General Public License for more details.
;; You should have received a copy of the GNU General Public License
;; along with this program. If not, see <https://www.gnu.org/licenses/>.
;;; Commentary:
;; This package is a Vertico extension, which adds mouse support.
;;; Code:
(require 'vertico)
(defface vertico-mouse
'((t :inherit highlight))
"Face used for mouse highlighting."
:group 'vertico-faces)
(defun vertico-mouse--index (event)
"Return candidate index at EVENT."
(when-let ((object (posn-object (event-end event)))
((consp object)))
(get-text-property (cdr object) 'vertico-mouse--index (car object))))
(defun vertico-mouse--click (key)
"Create command handling mouse click, behave like KEY press."
(lambda (event)
(interactive "e")
;; Mouse clicks can even happen if another window is selected.
(with-selected-window (active-minibuffer-window)
(when-let ((vertico--index (vertico-mouse--index event))
(cmd (keymap-local-lookup key)))
(funcall cmd)))))
(defvar-keymap vertico-mouse-map
:doc "Additional keymap activated in mouse mode."
"<mouse-1>" (vertico-mouse--click "RET")
"<mouse-3>" (vertico-mouse--click "TAB"))
(fset 'vertico-mouse-map vertico-mouse-map)
(defun vertico-mouse--scroll-up (n)
"Scroll up by N lines."
(vertico--goto (max 0 (+ vertico--index n))))
(defun vertico-mouse--scroll-down (n)
"Scroll down by N lines."
(vertico-mouse--scroll-up (- n)))
;;;###autoload
(define-minor-mode vertico-mouse-mode
"Mouse support for Vertico."
:global t :group 'vertico)
(cl-defmethod vertico--format-candidate
:around (cand prefix suffix index start &context (vertico-mouse-mode (eql t)))
(setq cand (cl-call-next-method cand prefix
(concat suffix #(" " 0 1 (display (space :align-to right))))
index start))
(add-text-properties 0 (1- (length cand))
`(vertico-mouse--index ,index
mouse-face vertico-mouse keymap vertico-mouse-map)
cand)
cand)
(cl-defmethod vertico--setup :after (&context (vertico-mouse-mode (eql t)))
(when (boundp 'mwheel-coalesce-scroll-events)
(setq-local mwheel-coalesce-scroll-events t))
(setq-local mwheel-scroll-up-function #'vertico-mouse--scroll-up
mwheel-scroll-down-function #'vertico-mouse--scroll-down))
(provide 'vertico-mouse)
;;; vertico-mouse.el ends here
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