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|
;;; sliders.el --- graphical sliders for XEmacs. (c) 1997
;; Author: Jens Lautenbacher <jens@tellux.de>
;; Keywords: utilities
;; Version: 0.3
;; This file is not (yet?) part of XEmacs.
;; XEmacs 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 2, or (at your option)
;; any later version.
;; XEmacs 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 XEmacs; see the file COPYING. If not, write to the
;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
;; Boston, MA 02111-1307, USA.
;; Code:
;;
;;; Compatibility.
;; There is a bug in XEmacs extents where the order of extent glyphs
;; can get messed up when you have zero-length extents. SXEmacs has
;; this fixed, but because it is such a long-standing bug code like
;; this was written against the "buggy" extent api and so "breaks"
;; when used with non-buggy extents. Hence this compatibility snippet
;; here. --SY.
(eval-and-compile
(if (featurep 'sxemacs)
(progn
(fset #'slider-set-glyph #'set-extent-end-glyph)
(fset #'slider-glyph #'extent-end-glyph))
(fset #'slider-set-glyph #'set-extent-begin-glyph)
(fset #'slider-glyph #'extent-begin-glyph)))
;;; First of all we'll define the needed variables.
(defconst slider-bar-elem-width 4)
(defvar slider-pixmap-dir (locate-data-directory "slider"))
(defvar slider-bar-keymap nil)
(if slider-bar-keymap ()
(setq slider-bar-keymap (make-keymap 'slider-bar-keymap))
(suppress-keymap slider-bar-keymap)
(define-key slider-bar-keymap "+" 'slider-one-right-this)
(define-key slider-bar-keymap "-" 'slider-one-left-this)
(define-key slider-bar-keymap 'button1 'slider-activate-arrow-or-bar))
(defvar slider-knob-keymap nil)
(if slider-knob-keymap ()
(setq slider-knob-keymap (make-keymap 'slider-knob-keymap))
(suppress-keymap slider-knob-keymap)
(define-key slider-knob-keymap 'button1 'slider-activate-knob))
;;; Add the correct path here!
(defvar slider-left-up (make-glyph (concat slider-pixmap-dir "left-up.xpm")))
(defvar slider-left-down (make-glyph (concat slider-pixmap-dir "left-down.xpm")))
(defvar slider-right-up (make-glyph (concat slider-pixmap-dir "right-up.xpm")))
(defvar slider-right-down (make-glyph (concat slider-pixmap-dir "right-down.xpm")))
(defvar slider-element (make-glyph (concat slider-pixmap-dir "bar.xpm")))
(defvar slider-knob (make-glyph (concat slider-pixmap-dir "knob.xpm")))
(defun slider-new (visible-size min-val max-val stepsize
&optional callback callback-data read-only)
(let* ((number-of-bars (/ visible-size slider-bar-elem-width))
(left-vector (make-vector (1+ number-of-bars) nil))
(right-vector (make-vector (1+ number-of-bars) nil))
knob slider tmp)
;; creating the extents....
;; the left part: left-vector[0] is the left arrow.
(insert-string " ")
(goto-char (1- (point)))
(setq slider (make-extent (point) (point)))
(set-extent-property slider 'keymap slider-bar-keymap)
(set-extent-property slider 'read-only read-only)
(set-extent-property slider 'start-open t)
(set-extent-property slider 'slider t)
(set-extent-property slider 'slider-stepsize stepsize)
(set-extent-property slider 'slider-left left-vector)
(set-extent-property slider 'slider-right right-vector)
(set-extent-property slider 'slider-max max-val)
(set-extent-property slider 'slider-min min-val)
(set-extent-property slider 'slider-callback callback)
(set-extent-property slider 'slider-data callback-data)
(set-extent-property slider 'slider-value min-val)
(set-extent-property slider 'slider-value-int 0)
(set-extent-property slider 'slider-number-of-bars number-of-bars)
(set-extent-face slider 'bold)
(setq tmp (make-extent (point) (point)))
(aset left-vector 0 tmp)
(set-extent-keymap tmp slider-bar-keymap)
(set-extent-property tmp 'slider-action 'slider-one-left)
(set-extent-property tmp 'slider-down slider-left-down)
;; from 1 to number-of-bars: the slider bar to the left.
(let ((count 1))
(while (<= count number-of-bars) ; <= to get length + 1 elements
(setq tmp (make-extent (point) (point)))
(aset left-vector count tmp)
(set-extent-keymap tmp slider-bar-keymap)
(set-extent-property tmp 'slider-action 'slider-left-action)
(setq count (1+ count))))
;; now the sliders "knob"
(setq knob (make-extent (point) (point)))
(set-extent-property knob 'slider-this slider)
;; the right part:
;; from 0 to (1- number-of-bars): the slider bar to the right
(let ((count 0))
(while (< count number-of-bars) ; < to get length elements
(setq tmp (make-extent (point) (point)))
(aset right-vector count tmp)
(set-extent-keymap tmp slider-bar-keymap)
(set-extent-property tmp 'slider-action 'slider-right-action)
(setq count (1+ count))))
;; the right arrow.
(aset right-vector number-of-bars
(setq tmp (make-extent (point) (point))))
(set-extent-keymap tmp slider-bar-keymap)
(set-extent-property tmp 'slider-action 'slider-one-right)
(set-extent-property tmp 'slider-down slider-right-down)
;; initializing the display:
;; left arrow glyph:
(slider-set-glyph (aref left-vector 0) slider-left-up)
;; the left bar is invisible, so make the knob glyph:
(slider-set-glyph knob slider-knob)
;; the right part of the bar is fully visible
(let ((count 0))
(while (< count number-of-bars)
(slider-set-glyph (aref right-vector count) slider-element)
(setq count (1+ count))))
;; the right arrow glyph
(slider-set-glyph (aref right-vector number-of-bars) slider-right-up)
;; put some needed information into the knob's properties.
(set-extent-property knob 'slider-action 'slider-drag-knob)
(set-extent-keymap knob slider-knob-keymap)
;; loop oer the whole left and right side and fill in needed properties
(let ((count 0))
(while (<= count number-of-bars)
(set-extent-property (setq tmp (aref right-vector count))
'slider-this slider)
(set-extent-property tmp 'slider-bar-number (+ 1 count))
(set-extent-property (setq tmp (aref left-vector count))
'slider-this slider)
(set-extent-property tmp 'slider-bar-number count)
(setq count (1+ count))))
;; return the knob.
(goto-char (1+ (point)))
slider))
(defun slider-set (slider abs-value)
(let* ((max (extent-property slider 'slider-max))
(min (extent-property slider 'slider-min))
(func (extent-property slider 'slider-callback))
(length (extent-property slider 'slider-number-of-bars))
(step (floor (* (/ (float length) (float (- max min)))
(- abs-value min)))))
(if (not (sliderp slider))
(error "No slider: %s" slider))
(if (or (< abs-value min) (> abs-value max))
(error "Value %s not in allowed range [%s...%s]"
abs-value min max)
(let ((count 1))
(while (<= count step)
(slider-set-glyph
(aref (extent-property slider 'slider-left)
count)
slider-element)
(setq count (1+ count)))
(while (<= count length)
(slider-set-glyph
(aref (extent-property slider 'slider-left)
count)
nil)
(setq count (1+ count))))
(let ((count 0))
(while (< count step)
(slider-set-glyph
(aref (extent-property slider 'slider-right)
count)
nil)
(setq count (1+ count)))
(while (< count length)
(slider-set-glyph
(aref (extent-property slider 'slider-right)
count)
slider-element)
(setq count (1+ count))))
(set-extent-property slider 'slider-value abs-value)
(set-extent-property slider 'slider-value-int step)
(if func (funcall func slider (extent-property slider 'slider-data)))
abs-value)))
(defun slider-set-data (slider data)
(cond ((sliderp slider)
(set-extent-property slider 'slider-data data))
(t
(error "No slider: %s" slider))))
(defun slider-get (slider)
(cond ((sliderp slider)
(extent-property slider 'slider-value))
(t
(error "No slider: %s" slider))))
(defun slider-destroy (slider)
(let ((start (extent-start-position slider))
(end (extent-end-position slider)))
(cond ((sliderp slider)
(set-extent-property slider 'read-only nil)
(delete-region start end))
(t
(error "No slider: %s" slider)))))
;;; Internal functions below...
(defun sliderp (obj)
(if (extentp obj)
(extent-property obj 'slider)))
(defun slider-one-right (slider)
(let ((val (slider-get slider))
(max (extent-property slider 'slider-max)))
(if (< val max) (slider-set slider (1+ val)))))
(defun slider-one-left (slider)
(let ((val (slider-get slider))
(min (extent-property slider 'slider-min)))
(if (> val min) (slider-set slider (1- val)))))
(defun slider-right-action (slider)
(let ((val (slider-get slider))
(stepsize (extent-property slider 'slider-stepsize))
(max (extent-property slider 'slider-max)))
(if (< val max) (slider-set slider (min max (+ stepsize val))))))
(defun slider-left-action (slider)
(let ((val (slider-get slider))
(stepsize (extent-property slider 'slider-stepsize))
(min (extent-property slider 'slider-min)))
(if (> val min) (slider-set slider (max min (- val stepsize))))))
(defun slider-one-right-this ()
(interactive)
(let ((slider (extent-at (point) (current-buffer) 'slider nil 'at)))
(slider-one-right slider)
(sit-for 0)))
(defun slider-one-left-this ()
(interactive)
(let ((slider (extent-at (point) (current-buffer) 'slider nil 'at)))
(slider-one-left slider)
(sit-for 0)))
(defun slider-activate-arrow-or-bar (event)
(interactive "e")
(let* ((extent (event-glyph-extent event))
(mouse-down t)
(action (extent-property extent 'slider-action))
up-glyph down-glyph)
;; make the glyph look pressed
(cond ((setq down-glyph (extent-property extent 'slider-down))
(setq up-glyph (slider-glyph extent))
(slider-set-glyph extent down-glyph)))
(while mouse-down
(if (input-pending-p)
(setq event (next-event event))
(if action (funcall action (extent-property extent 'slider-this)))
(sit-for 0))
(if (button-release-event-p event)
(setq mouse-down nil)))
;; make the glyph look released
(if down-glyph (slider-set-glyph extent up-glyph))))
(defun slider-activate-knob (event)
(interactive "e")
(let* ((extent (event-glyph-extent event))
(X (event-x-pixel event))
(bar (extent-property (extent-property extent 'slider-this)
'slider-value-int))
(max-bar (extent-property (extent-property extent 'slider-this)
'slider-number-of-bars))
(mouse-down t)
(action (extent-property extent 'slider-action))
X-new X-diff new-bar)
(while mouse-down
(setq event (next-event event))
(cond ((mouse-event-p event)
(setq X-new (event-x-pixel event))
(setq X-diff (- X-new X))
(setq new-bar (max (min (+ bar (/ X-diff slider-bar-elem-width))
(1+ max-bar)) 0))
(cond ((not (= bar new-bar))
(funcall action (extent-property extent 'slider-this)
new-bar)
(setq X (+ X (* slider-bar-elem-width (- new-bar bar))))
(setq bar new-bar)))
(if (button-release-event-p event)
(setq mouse-down nil)))))))
(defun slider-drag-knob (extent bar)
(let* ((range (- (extent-property extent 'slider-max)
(extent-property extent 'slider-min)))
(offset (extent-property extent 'slider-min))
(slider-length (length (extent-property extent 'slider-left)))
(value (floor (* bar (/ (float range) (float slider-length))))))
(slider-set extent (+ offset value))))
(provide 'slider)
|
