186 lines
6.8 KiB
Common Lisp
186 lines
6.8 KiB
Common Lisp
;;;; Copyright © 2023, Jaidyn Ann <jadedctrl@posteo.at>
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;;;;
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;;;; This program is free software: you can redistribute it and/or
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;;;; modify it under the terms of the GNU General Public License as
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;;;; published by the Free Software Foundation, either version 3 of
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;;;; the License, or (at your option) any later version.
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;;;;
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;;;; This program is distributed in the hope that it will be useful,
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;;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;;;; GNU General Public License for more details.
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;;;;
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;;;; You should have received a copy of the GNU General Public License
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;;;; along with this program. If not, see <https://www.gnu.org/licenses/>.
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;;;; FLORA-SEARCH-AURORA.UI
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;;;; Generic menu-making, displaying, and management.
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;;;; Let's get to it, we're on a deadline!
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(defpackage :flora-search-aurora.ui
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(:use :cl :flora-search-aurora.display)
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(:export #:ui-loop #:render-menu-strip))
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(in-package :flora-search-aurora.ui)
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;;; ———————————————————————————————————
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;;; Menu loops
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;;; ———————————————————————————————————
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(defun ui-loop (last-matrix menu-alist)
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"The state loop to be used for displaying/processing/input-managing
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with menus."
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(let* ((matrix (make-screen-matrix))
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(new-menu (ui-update matrix menu-alist)))
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(ui-draw matrix last-matrix)
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(sleep 1)
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(ui-loop matrix new-menu)))
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(defun ui-draw (matrix last-matrix)
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"The draw loop for menus."
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(print-screen-matrix (matrix-delta last-matrix matrix))
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(finish-output))
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(defun ui-update (matrix menu-alist)
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"The update loop for menus. It processes all input, state, etc, and
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returns the new state of the menu."
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(render-menu-strip matrix menu-alist 0 0)
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(cdr menu-alist))
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;;; ———————————————————————————————————
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;;; Menu display
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;;; ———————————————————————————————————
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(defun render-line (matrix text x y)
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"Apply a one-line string to the matrix at the given coordinates."
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(if (and (stringp text)
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(> (length text) 0))
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(progn
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(setf (aref matrix y x)
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(char text 0))
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(render-line matrix (subseq text 1)
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(+ x 1) y))
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matrix))
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(defun render-menu-item
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(matrix text x y &key (width (+ (length text) 2)) (height 3) (selected 0))
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"Render a “menu-item” — that is, text surrounded by a box with an optional
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'selected' form. If selected is a non-zero number below 100, then that percent
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of the box will be displayed as selected/highlighted. This percent is from
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left-to-right, unless negative — in which case, right-to-left."
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(render-string matrix text (+ x 1) (+ 1 y)
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:max-column (- (+ x width) 1)
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:max-row (- (+ y height) 2))
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;; Render the normal top and bottom bars.
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(dotimes (i width)
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(setf (aref matrix y (+ x i)) #\-)
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(setf (aref matrix (+ y (- height 1)) (+ x i)) #\-))
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;; Render the weird “selected” top and bottom bars. A menu item might be
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;; only partially-selected…
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(if (and selected
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(not (eq selected 0)))
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(let* ((bar-width
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(at-most width (ceiling (* width (* (abs selected)
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.01)))))
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(bar-start (if (> 0 selected) (- width bar-width) 0)))
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(dotimes (i bar-width)
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(setf (aref matrix y (+ x bar-start i)) #\=)
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(setf (aref matrix (+ y (- height 1)) (+ x bar-start i)) #\=))))
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;; Render the horizontal “earmuffs” for helping the selected item stand out.
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(when (and selected
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(not (eq selected 0)))
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(dotimes (i (- height 2))
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(setf (aref matrix (+ y i 1) x) #\|)
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(setf (aref matrix (+ y i 1) (+ x width -1)) #\|))
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matrix))
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(defun render-menu-strip (matrix items x y &key (max-item-width 12) (height 3))
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"Render several menu items to the matrix, starting at the given x/y coordinates,
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maximum width for any given item, and the height of all items. If given a selected
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item, than selected-% percent of it is displayed as highlighted/selected."
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(let ((x x))
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(mapcar
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(lambda (item)
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(let* ((label (car item))
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(selected (or (assoc 'selected (cdr item))
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0))
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(width (at-most max-item-width
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(+ (length label) 2))))
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(render-menu-item matrix label x y
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:width width
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:height height
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:selected selected)
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(setf x (+ x width 1))))
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items))
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matrix)
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(defun render-string (matrix text x y &key (max-column 72) (max-row 20))
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"Render the given string to the matrix of characters, character-by-character.
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Will line-break or truncate as appropriate and necessary to not exceed the
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positional arguments nor the dimensions of the matrix."
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(let* ((dimensions (array-dimensions matrix))
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(max-column (at-most (cadr dimensions) max-column))
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(max-row (at-most (car dimensions) max-row))
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(substrings (split-string-by-length text (- max-column x)))
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(row 0))
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(loop while (and (<= (+ y row) max-row)
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substrings)
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do
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(render-line matrix (pop substrings)
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x (+ y row))
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(incf row)))
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matrix)
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;;; ———————————————————————————————————
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;;; Misc. utils
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;;; ———————————————————————————————————
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(defun split-string-by-length (string line-length &key (substrings '()))
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"Given a string, split it into a list of substrings all with lengths
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equal or lower to the given length."
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(if (> (length string) line-length)
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(split-string-by-length
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(subseq string line-length)
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line-length
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:substrings (append substrings
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`(,(subseq string 0 line-length))))
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(append substrings `(,string))))
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(defun at-most (maximum num)
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"This function returns at most every hope and dream you've ever had, and at
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minimum returns your more pitiful of moments."
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(if (> num maximum)
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maximum
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num))
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(defun at-least (minimum num)
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"This function returns at least every hope and dream you've ever had, and at
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maximum returns your more pitiful of moments."
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(if (< num minimum)
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minimum
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num))
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(defun ± (num add)
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"Either add to a number, or subtract from it; whichever brings it closer to zero.
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In addition, the resultant value shall not “pass” zero."
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(cond
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((< num 0)
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(at-most 0 (+ num add)))
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((> num 0)
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(at-minimum 0 (- num add)))
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('t
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num)))
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