eldoc-frame/eldoc-box.el

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;;; eldoc-box.el --- Display documentation in childframe -*- lexical-binding: t; -*-
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;; Copyright (C) 2017-2018 Sebastien Chapuis, 2018 Yuan Fu
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;; Version: 1.4
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;; Author: Sebastien Chapuis <sebastien@chapu.is>
;; Maintainer: Yuan Fu <casouri@gmail.com>
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;; Contributors:
;; João Távora <joaotavora@gmail.com>
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;; URL: https://github.com/casouri/eldoc-box
;; Package-Requires: ((emacs "26.1"))
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;;; License
;;
;; 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, 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; see the file COPYING. If not, write to
;; the Free Software Foundation, Inc., 51 Franklin Street, Fifth
;; Floor, Boston, MA 02110-1301, USA.
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;;; This file is NOT part of GNU Emacs
;;; Commentary:
;;
;; Made a lot of change to use it for ElDoc
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;;; Code:
;;
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(require 'cl-lib)
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;;;; Userland
;;;;; Variable
(defgroup eldoc-box nil
"Display Eldoc docs in a pretty child frame."
:prefix "eldoc-box-"
:group 'eldoc)
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(defface eldoc-box-border '((((background dark)) . (:background "white"))
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(((background light)) . (:background "black")))
"The border color used in childframe.")
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(defface eldoc-box-body '((t . (:background nil)))
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"Body face used in eglot doc childframe. Only :background is used.")
(defvar eldoc-box-only-multi-line nil
"If non-nil, only use childframe when there are more than one line.")
(defvar eldoc-box-cleanup-interval 1
"After this amount of seconds will eldoc-box attempt to cleanup the childframe.
E.g. if it is set to 1, the childframe is cleared 1 second after
you moved the point to somewhere else (that doesn't have a doc to show)")
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(defvar eldoc-box-frame-parameters
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'(
;; (left . -1)
(no-accept-focus . t)
(no-focus-on-map . t)
(min-width . 0)
;; (width . 0)
(min-height . 0)
;; (height . 0)
(internal-border-width . 1)
(vertical-scroll-bars . nil)
(horizontal-scroll-bars . nil)
(right-fringe . 0)
(menu-bar-lines . 0)
(tool-bar-lines . 0)
(line-spacing . 0)
(unsplittable . t)
(undecorated . t)
;; (top . -1)
(visibility . nil)
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(mouse-wheel-frame . nil)
(no-other-frame . t)
(cursor-type . nil)
(inhibit-double-buffering . t)
(drag-internal-border . t)
(no-special-glyphs . t)
(desktop-dont-save . t))
"Frame parameters used to create the frame.")
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(defvar eldoc-box-max-pixel-width 800
"Maximum width of doc childframw in pixel.
Consider your machine's screen's resolution when setting this variable.")
(defvar eldoc-box-max-pixel-height 700
"Maximum height of doc childframw in pixel.
Consider your machine's screen's resolution when setting this variable.")
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;;;;; Function
(defvar eldoc-box--frame nil ;; A backstage variable
"The frame to display doc.")
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(defun eldoc-box-quit-frame ()
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"Hide childframe used by eglot doc."
(interactive)
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(when eldoc-box--frame
(make-frame-invisible eldoc-box--frame t)))
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;;;###autoload
(define-minor-mode eldoc-box-hover-mode
"Displays hover documentations in a childframe. This mode is buffer local."
:lighter " ELDOC-BOX"
(if eldoc-box-hover-mode
(add-function :before-until (local 'eldoc-message-function)
#'eldoc-box--eldoc-message-function)
(remove-function (local 'eldoc-message-function) #'eldoc-box--eldoc-message-function)
;; if minor mode is turned off when childframe is visible
;; hide it
(when eldoc-box--frame
(delete-frame eldoc-box--frame)
(setq eldoc-box--frame nil))))
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;;;; Backstage
;;;;; Variable
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(defvar eldoc-box--buffer " *eldoc-box*"
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"The buffer used to display eglot doc.")
;;;;; Function
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(defun eldoc-box--display (str)
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"Display STR in childframe."
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(let ((doc-buffer (get-buffer-create eldoc-box--buffer)))
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(with-current-buffer doc-buffer
(setq mode-line-format nil)
;; without this, clicking childframe will make doc buffer the current buffer
;; and `eldoc-box--maybe-cleanup' in `eldoc-box--cleanup-timer' will clear the childframe
(setq eldoc-box-hover-mode t)
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(erase-buffer)
(insert str)
(eldoc-box--get-frame doc-buffer))))
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(defun eldoc-box--window-side ()
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"Return 'left if the selected window is on the left,
'right if on the right. Return 'left if there is only one window."
(let ((left-window(window-at 0 0)))
(if (eq left-window (selected-window))
'left
'right)))
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(defun eldoc-box--get-frame (buffer)
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"Return a childframe displaying BUFFER.
Checkout `lsp-ui-doc--make-frame', `lsp-ui-doc--move-frame'."
(let* ((after-make-frame-functions nil)
(before-make-frame-hook nil)
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(parameter (append eldoc-box-frame-parameters
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`((default-minibuffer-frame . ,(selected-frame))
(minibuffer . ,(minibuffer-window))
(left-fringe . ,(frame-char-width)))))
(window (or (and eldoc-box--frame (frame-selected-window eldoc-box--frame))
(display-buffer-in-child-frame
buffer
`((child-frame-parameters . ,parameter)))))
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(frame (window-frame window))
(main-frame (selected-frame)))
(make-frame-visible frame)
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(set-window-dedicated-p window t)
(redirect-frame-focus frame (frame-parent frame))
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(set-face-attribute 'internal-border frame :inherit 'eldoc-box-border)
(set-face-attribute 'default frame :background (face-attribute 'eldoc-box-body :background main-frame))
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;; set size
(let* ((size
(window-text-pixel-size
window nil nil
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eldoc-box-max-pixel-width
eldoc-box-max-pixel-height t))
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(width (car size))
(height (cdr size))
(width (+ width (frame-char-width frame))) ; add margin
(frame-resize-pixelwise t))
(set-frame-size frame width height t)
;; move position
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(set-frame-position frame (pcase (eldoc-box--window-side) ; x position + a little padding (16)
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;; display doc on right
('left (- (frame-outer-width main-frame) width 16))
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;; display doc on left
('right 16))
;; y position + a little padding (16)
16))
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(setq eldoc-box--frame frame)))
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;;;;; ElDoc
(defvar eldoc-box--cleanup-timer nil
"The timer used to cleanup childframe after ElDoc.")
(defvar eldoc-box--last-point 0
;; used in `eldoc-box--maybe-cleanup'
"Last point when eldoc-box showed childframe.")
(defun eldoc-box--maybe-cleanup ()
"Clean up after ElDoc."
;; timer is global, so this function will be called outside
;; the buffer with `eldoc-box-hover-mode' enabled
(if (and (frame-parameter eldoc-box--frame 'visibility)
(or (and (not eldoc-last-message) ; 1
(not (eq (point) eldoc-box--last-point)) ; 2
(not (eq (current-buffer) (get-buffer eldoc-box--buffer)))) ; 3
(not eldoc-box-hover-mode))) ; 4
;; 1. Obviously, last-message nil means we are not on a valid symbol anymore.
;; 2. Or are we? If you scroll the childframe with mouse wheel
;; `eldoc-pre-command-refresh-echo-area' will set `eldoc-last-message' to nil.
;; Without the point test, this function, called by `eldoc-box--cleanup-timer'
;; will clear the doc frame, not good
;; 3. If scrolling can't satisfy you and you clicked the childframe
;; both 1. and 2. are satisfied. 3. is the last hope to prevent this function
;; from clearing your precious childframe. There is another safety pin in
;; `eldoc-box--display' that works with 3.
;; 4. Sometimes you switched buffer when childframe is on.
;; it wouldn't go away unless you goes back and let eldoc shut it off.
;; So if we are not in `eldoc-box-hover-mode', clear childframe
(eldoc-box-quit-frame)
;; so you didn't clear the doc frame this time, and the last timer has ran out
;; setup another one to make sure the doc frame is cleared
;; once the condition above it met
(setq eldoc-box--cleanup-timer
(run-with-timer eldoc-box-cleanup-interval nil #'eldoc-box--maybe-cleanup))))
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(defun eldoc-box--eldoc-message-function (str &rest args)
"Front-end for eldoc. Display STR in childframe and ARGS works like `message'."
(when (stringp str)
(let ((doc (apply #'format str args)))
(unless (and eldoc-box-only-multi-line (eq (cl-count ?\n doc) 0))
(eldoc-box--display doc)
(setq eldoc-box--last-point (point))
;; Why a timer? ElDoc is mainly used in minibuffer,
;; where the text is constantly being flushed by other commands
;; so ElDoc doesn't try very hard to cleanup
(when eldoc-box--cleanup-timer (cancel-timer eldoc-box--cleanup-timer))
;; this function is also called by `eldoc-pre-command-refresh-echo-area'
;; in `pre-command-hook', which means the timer is reset before every
;; command if `eldoc-box-hover-mode' is on and `eldoc-last-message' is not nil.
(setq eldoc-box--cleanup-timer
(run-with-timer eldoc-box-cleanup-interval nil #'eldoc-box--maybe-cleanup))))
t))
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(provide 'eldoc-box)
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;;; eldoc-box.el ends here