#| -*-Scheme-*-

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    2017, 2018, 2019, 2020, 2021, 2022 Massachusetts Institute of
    Technology

This file is part of MIT/GNU Scheme.

MIT/GNU Scheme 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 of the License, or (at
your option) any later version.

MIT/GNU Scheme 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.

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|#

;;;; Utility Windows

(declare (usual-integrations))

;;;; Blank Window

(define-class blank-window vanilla-window
  ())

(define (blank-window:update-display! window screen x-start y-start
				      xl xu yl yu display-style)
  window display-style			;ignore
  (screen-clear-rectangle screen
			  (fix:+ x-start xl) (fix:+ x-start xu)
			  (fix:+ y-start yl) (fix:+ y-start yu)
			  false)
  true)

(define-method blank-window :update-display!
  blank-window:update-display!)

;;;; Vertical Border Window

(define-class vertical-border-window vanilla-window
  ())

(define-method vertical-border-window (:initialize! window window*)
  (usual==> window :initialize! window*)
  (set! x-size 1))

(define-method vertical-border-window (:set-x-size! window x)
  window				;ignore
  (error "Can't change the x-size of a vertical border window" x))

(define-method vertical-border-window (:set-size! window x y)
  (if (not (fix:= x 1))
      (error "Can't change the x-size of a vertical border window" x))
  (set! x-size x)
  (set! y-size y)
  (setup-redisplay-flags! redisplay-flags))

(define (vertical-border-window:update-display! window screen x-start y-start
						xl xu yl yu display-style)
  display-style				;ignore
  (if (fix:< xl xu)
      (clip-window-region-1 yl yu (window-y-size window)
	(lambda (yl yu)
	  (let ((xl (fix:+ x-start xl))
		(yu (fix:+ y-start yu)))
	    (let loop ((y (fix:+ y-start yl)))
	      (if (fix:< y yu)
		  (begin
		    (screen-output-char screen xl y #\| false)
		    (loop (fix:+ y 1)))))))))
  true)

(define-method vertical-border-window :update-display!
  vertical-border-window:update-display!)

;;;; Cursor Window

(define-class cursor-window vanilla-window
  (enabled?))

(define-method cursor-window (:initialize! window window*)
  (usual==> window :initialize! window*)
  (set! x-size 1)
  (set! y-size 1)
  (set! enabled? false))

(define-method cursor-window (:set-x-size! window x)
  window				;ignore
  (error "Can't change the size of a cursor window" x))

(define-method cursor-window (:set-y-size! window y)
  window				;ignore
  (error "Can't change the size of a cursor window" y))

(define-method cursor-window (:set-size! window x y)
  window				;ignore
  (error "Can't change the size of a cursor window" x y))

(define (cursor-window:update-display! window screen x-start y-start
				       xl xu yl yu display-style)
  display-style				;ignore
  (if (and (with-instance-variables cursor-window window () enabled?)
	   (fix:< xl xu)
	   (fix:< yl yu))
      (screen-move-cursor screen x-start y-start))
  true)

(define-method cursor-window :update-display!
  cursor-window:update-display!)

(define-method cursor-window (:enable! window)
  (set! enabled? true)
  (setup-redisplay-flags! redisplay-flags))

(define-method cursor-window (:disable! window)
  (set! enabled? false)
  (set-car! redisplay-flags false))