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;;; Lisparuga
;;; Copyright © 2020 David Thompson <dthompson2@worcester.edu>
;;;
;;; Lisparuga 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.
;;;
;;; Lisparuga 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 Lisparuga. If not, see <http://www.gnu.org/licenses/>.
;;; Commentary:
;;
;; 2D Graphical User Interface
;;
;;; Code:
(define-module (lisparuga gui)
#:use-module (chickadee math rect)
#:use-module (chickadee math vector)
#:use-module (chickadee render color)
#:use-module (chickadee render font)
#:use-module (chickadee render shapes)
#:use-module (ice-9 match)
#:use-module (oop goops)
#:use-module (lisparuga node)
#:use-module (lisparuga node-2d)
#:export (<widget>
width
height
<label-widget>
<margin-container>
left
right
bottom
top))
;;;
;;; Base Widget
;;;
(define *draw-bounding-boxes?* #t)
(define %bounding-box-color (make-color 1.0 0.0 1.0 0.2))
(define-class <widget> (<node-2d>)
(width #:accessor width #:init-keyword #:width #:init-form 0.0)
(height #:accessor height #:init-keyword #:height #:init-form 0.0)
(min-width #:accessor min-width #:init-keyword #:min-width #:init-form 0.0)
(min-height #:accessor min-height #:init-keyword #:min-height #:init-form 0.0)
(bounding-box #:getter bounding-box #:init-form (make-rect 0.0 0.0 0.0 0.0))
(dirty-bounding-box? #:accessor dirty-bounding-box? #:init-form #t))
(define-method (dirty! (widget <widget>))
(set! (dirty-bounding-box? widget) #t)
(next-method))
(define-method ((setter width) (widget <widget>) w)
(slot-set! widget 'width (pk 'new-width (max (min-width widget) w)))
(dirty! widget))
(define-method ((setter height) (widget <widget>) h)
(slot-set! widget 'height (max (min-height widget) h))
(dirty! widget))
(define-method (update (widget <widget>) dt)
(when (dirty-bounding-box? widget)
(let ((bb (bounding-box widget))
(w (width widget))
(h (height widget)))
(set-rect-width! bb w)
(set-rect-height! bb h))
(set! (dirty-bounding-box? widget) #f)))
(define-method (render (widget <widget>) alpha)
(draw-filled-rect (bounding-box widget) %bounding-box-color
#:matrix (world-matrix widget))
(next-method))
;;;
;;; Text Label
;;;
(define-class <label-widget> (<widget>)
(text #:accessor text #:init-keyword #:text #:init-form ""))
(define-method ((setter text) (label <label-widget>) new-text)
(set! (text (& label label)) new-text)
(next-method))
(define-method (on-boot (label <label-widget>))
(attach-to label
(make <label>
#:name 'label
#:text (text label))))
;;;
;;; Margin Container
;;;
(define-class <margin-container> (<widget>)
(left #:accessor left #:init-keyword #:left #:init-form 0.0)
(right #:accessor right #:init-keyword #:right #:init-form 0.0)
(bottom #:accessor bottom #:init-keyword #:bottom #:init-form 0.0)
(top #:accessor top #:init-keyword #:top #:init-form 0.0)
(needs-resize? #:accessor needs-resize? #:init-form #t))
(define-method (on-attach (container <margin-container>) (widget <widget>))
(set! (needs-resize? container) #t))
(define-method (on-detach (container <margin-container>) (widget <widget>))
(set! (needs-resize? container) #t))
(define-method (update (container <margin-container>) dt)
(when (needs-resize? container)
(let loop ((c (children container))
(w 0.0)
(h 0.0))
(match c
(()
(set! (width container) (pk 'new-width (+ w (left container) (right container))))
(set! (height container) (+ h (bottom container) (top container)))
(for-each (lambda (child)
(when (is-a? child <widget>)
(set! (width child) w)
(set! (height child) h)
(teleport child (left container) (bottom container))))
(children container)))
((child . rest)
(if (is-a? child <widget>)
(loop rest
(max w (min-width child))
(max h (min-height child)))
(loop rest w h)))))
(set! (needs-resize? container) #f))
(next-method))
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