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|
;; proof-splash.el -- Splash welcome screen for Proof General
;;
;; Copyright (C) 1998 LFCS Edinburgh.
;; Author: David Aspinall
;; Maintainer: Proof General maintainer <proofgen@dcs.ed.ac.uk>
;;
;; $Id$
;;
(require 'annotations)
(defconst proof-welcome "*Proof General Welcome*"
"Name of the Proof General splash buffer.")
(defconst proof-display-splash-image
;; Use jpeg if we can, otherwise assume gif will work.
(if (featurep 'jpeg)
(cons 'jpeg
(concat proof-internal-images-directory
"ProofGeneral.jpg"))
(cons 'gif
(concat proof-internal-images-directory
(concat "ProofGeneral"
(or (and
(fboundp 'device-pixel-depth)
(> (device-pixel-depth) 8)
".gif")
;; Low colour gif for poor displays
".8bit.gif")))))
"Format and File name of Proof General Image.")
(defcustom proof-display-splash
(valid-instantiator-p
(vector (car proof-display-splash-image)
:file (cdr proof-display-splash-image)) 'image)
"*Display splash screen when Proof General is loaded."
:type 'boolean
:group 'proof)
(defcustom proof-internal-display-splash-time 4
"Minimum number of seconds to display splash screen for.
If the machine gets to the end of proof-mode faster than this,
we wait for the remaining time. Must be a value less than 40."
:type 'integer
:group 'proof-internal)
;; We take some care to preserve the users window configuration
;; underneath the splash screen. This is just to be polite.
(defun proof-remove-splash-screen (conf)
"Make function to remove splash screen and restore window config to conf."
`(lambda ()
(and ;; If splash buffer is still alive
(get-buffer proof-welcome)
(if (get-buffer-window (get-buffer proof-welcome))
;; Restore the window config if splash is being displayed
(set-window-configuration ,conf)
t)
;; And destroy splash buffer.
(kill-buffer proof-welcome))))
(defun proof-display-splash-screen ()
"Save window config and display Proof General splash screen.
No effect if proof-display-splash-time is zero."
(interactive)
(if proof-display-splash
(let*
((splashbuf (get-buffer-create proof-welcome))
(imglyph (make-glyph
(list (vector (car proof-display-splash-image) ':file
(cdr proof-display-splash-image)))))
;; Keep win config explicitly instead of pushing/popping because
;; if the user switches windows by hand in some way, we want
;; to ignore the saved value. Unfortunately there seems to
;; be no way currently to remove the top item of the stack.
(removefn (proof-remove-splash-screen
(current-window-configuration))))
(save-excursion
(set-buffer splashbuf)
(erase-buffer)
;; FIXME: centre display better. support FSFmacs.
(insert "\n\n\n\t\t")
(insert-char ?\ (/ (length proof-assistant) 2))
(insert " Welcome to\n\t\t "
proof-assistant " Proof General!\n\n\n\t\t ")
(let ((ann (make-annotation imglyph))) ; reveal-annotation doesn't
(reveal-annotation ann)) ; autoload, so use let form.
(insert "\n\n")
(delete-other-windows (display-buffer splashbuf)))
;; Start the timer with a dummy value of 40 secs, to time the
;; loading of the rest of the mode. This is a kludge to make
;; sure that the splash screen appears at least throughout the
;; load (which shouldn't last 40 secs!). But if the load is
;; triggered by something other than a call to proof-mode,
;; the splash screen *will* appear for 40 secs (unless the
;; user kills it or switches buffer).
(redisplay-frame nil t)
(start-itimer proof-welcome removefn 40))))
;; PROBLEM: when to call proof-display-splash-screen? Effect we'd
;; like is to call it during loading/initialising. It's hard to make
;; the screen persist after loading because of the action of
;; display-buffer acting after the mode function during find-file.
;; To approximate the best behaviour, we assume that this file is
;; loaded by a call to proof-mode. We display the screen now and add
;; a wait procedure temporarily to proof-mode-hook which prevents
;; redisplay until at least proof-internal-display-splash-time
;; has elapsed.
;; Display the screen ASAP...
(proof-display-splash-screen)
(defun proof-wait-for-splash-proof-mode-hook-fn ()
"Wait for a while displaying splash screen, then remove self from hook."
(if proof-display-splash
(let ((timer (get-itimer proof-welcome)))
(if timer
(if (< (- 40 proof-internal-display-splash-time)
(itimer-value timer))
;; Splash has still not been seen for all of
;; internal-display-splash-time, set the timer
;; for the remaining time...
(progn
(set-itimer-value timer
(- proof-internal-display-splash-time
(- 40 (itimer-value timer))))
;; and wait until it finishes or user-input
(while (and (get-itimer proof-welcome)
(sit-for 1 t)))
;; If timer still running, run function
;; and delete timer.
(if (itimer-live-p timer)
(progn
(funcall (itimer-function timer))
(delete-itimer timer))))))))
(remove-hook 'proof-mode-hook 'proof-wait-for-splash-hook))
(add-hook 'proof-mode-hook 'proof-wait-for-splash-proof-mode-hook-fn)
(provide 'proof-splash)
;; End of proof-splash.
|
