;;;;
;;;; <Multiple-window> and <Inner-Window> classes 
;;;;
;;;; Copyright © 1993-1996 Erick Gallesio - I3S-CNRS/ESSI <eg@unice.fr>
;;;; 
;;;; Permission to use, copy, and/or distribute this software and its
;;;; documentation for any purpose and without fee is hereby granted, provided
;;;; that both the above copyright notice and this permission notice appear in
;;;; all copies and derived works.  Fees for distribution or use of this
;;;; software or derived works may only be charged with express written
;;;; permission of the copyright holder.  
;;;; This software is provided ``as is'' without express or implied warranty.
;;;;
;;;;
;;;; Idea of multiples windows comes from a Tcl package called mdw_lib.tk
;;;; (a classlib for [m]ulti-[d]ocument-[w]indow applications).
;;;; The mdw-lib is a number of Tcl/Tk procedures to create and manipulate 
;;;; multiple childwindows in one Tk application window 
;;;; The  mdw_lib author is Thomas Schwarze <swz@rtws18.ee.tu-berlin.de>
;;;; Original package is GPL'ed. However, code and way to implement
;;;; multiple windows and mdw_lib are completely different.
;;;;
;;;;           Author: Erick Gallesio [eg@unice.fr]
;;;;    Creation date:  5-Apr-1996 18:04
;;;; Last file update: 13-Aug-1996 23:22

(require "Frame")
(require "Button")


(image 'create 'bitmap '*bitmap-cross* :data
"#define cross_width 10
#define cross_height 10
static unsigned char cross_bits[] = {
0,0,0,0,0xc,3,0x9c,3,0xf8,1,0xf0,0,0xf0,0,0xf8,1,0x9c,3,0x0c,3};")


(image 'create 'bitmap '*bitmap-icon* :data
"#define icon_width 10
#define icon_height 10
static unsigned char icon_bits[] = {
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0xfc,3,0xfc,3,0,0};")

(image 'create 'bitmap '*bitmap-max* :data 
"#define max_width 10
#define max_height 10
static unsigned char max_bits[] = {
0,0,0,0,0xfc,3,0xfc,3,0xfc,3,0xfc,3,0xfc,3,0xfc,3,0xfc,3,0xfc,3};")

(image 'create 'bitmap '*bitmap-min* :data
"#define min_width 10
#define min_height 10
static unsigned char min_bits[] = {
0,0,0,0,0,0,0,0,0xf0,0,0xf0,0,0xf0,0,0xf0,0,0,0,0,0};")

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;;;
;;;; <Multiple-window> class
;;;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
(define-class <Multiple-window> (<Frame>)
  (bottom-bar bottom-bar-title
   (current		 :initform #f)
   (children		 :initform '())
   (child-selected-col	 :initform '("white"    . "RoyalBlue1"))
   (child-unselected-col :initform '("gray80" .  "gray50"))))

(define-method initialize ((self <Multiple-window>) initargs)
  (next-method)
  (if (zero? (width self))  (set! (width  self) 640))
  (if (zero? (height self)) (set! (height self) 480))
  (pack 'propagate self #f)

  ;; Create the bottom bar
  (let* ((bb (make <Frame> :parent self :border-width 3 :relief "groove"))
	 (l  (make <Label> :parent bb :width 20 :border-width 3 :relief "ridge"
		   	   :anchor "w")))
    (pack l :side "left" :expand #f :padx 3 :pady 3)
    (pack bb :side "bottom" :expand #f :fill "x")
    (slot-set! self 'bottom-bar bb)
    (slot-set! self 'bottom-bar-title l)))

(define-method pack ((self <Multiple-window>))   ;; Pack without parameter 
  (pack self :fill "both" :expand #t))

(define-method find-current-window ((self <Multiple-window>) avoid)
;; Find a plausible current window (i.e one which is different than
;; avoid and which is not iconified).
;; If no window is available return avoid.
  (letrec ((plausible (lambda (l)
			(cond ((null? l) avoid)
			      ((or (equal? (car l) avoid)
				   (slot-ref (car l) 'iconified?))
			       (plausible (cdr l)))
			      (ELSE (car l))))))
    (plausible (slot-ref self 'children))))

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;;;
;;;; <Inner-window> class
;;;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
(define-class <Inner-window> (<Tk-composite-widget> <Frame>)
  (title-label  icon-button maximize-button destroy-button icon internal-frame
   (width	:init-keyword :width 	:accessor width
		:allocation :propagated :propagate-to (frame))
   (height	:init-keyword :height 	:accessor height
		:allocation :propagated :propagate-to (frame))
   (title	:init-keyword :title 	:accessor title
		:allocation :propagated :propagate-to ((title-label text)))
   (x		:initform 0)
   (y		:initform 0)
   (maximized?	:initform #f)
   (iconified?	:initform #f)))

(define-method initialize-composite-widget ((self <Inner-Window>) initargs parent)
  (let* ((int   (make <Frame> :parent parent :border-width 0 :cursor "left_ptr"))
	 (title (make <Frame>  :parent int   :relief "ridge" :border-width 1))
	 (label (make <Label>  :parent title :text "No title" :cursor "hand2"))
	 (b1	(make <Button> :parent title :image *bitmap-cross* :cursor "arrow"))
	 (b2	(make <Button> :parent title :image *bitmap-max*   :cursor "arrow"))
	 (b3    (make <Button> :parent title :image *bitmap-icon* :cursor "arrow")))
   
    ;; Make internal sub windows
    (slot-set! self 'Id 	     (Id int))
    (slot-set! self 'title-label     label)
    (slot-set! self 'destroy-button  b1)
    (slot-set! self 'icon-button     b3)
    (slot-set! self 'maximize-button b2)
    (slot-set! self 'internal-frame  int)

    ;; Initialze slots
    (if (zero? (width parent))  (set! (width  parent) 500))
    (if (zero? (height parent)) (set! (height parent) 300))
    (slot-set! parent 'border-width  3)
    (slot-set! parent 'relief        "flat")
    (slot-set! parent 'background    "gray80")

    ;; Pack everything
    (pack label    :side "left" :expand #t :fill "x")
    (pack b1 b2 b3 :side "right")
    (pack 'propagate self #f)
    (pack title :side "top" :fill "x" :expand #f)
    (pack int :fill "both" :expand #t)
    
    ;; Associate buttons callbacks
    (set! (command b2) 
	  (lambda () 
	    ((if (slot-ref self 'maximized?) minimize-window maximize-window) 
	     self)))
    (set! (command b3) (lambda () (iconify-window self)))

    ;; Associate bindings
    (make-inner-window-bindings self label b1)

    ;; Add the new window to the multiple-window children list
    (let ((mult (slot-ref parent 'parent)))
      (slot-set! mult 'children (cons self (slot-ref mult 'children))))))

;;;;
;;;; make-inner-window-bindings 
;;;;  
;;;; The hard part: associate bindings to the window corners and to
;;;; the title bar. This is very long and very ugly; but can it be done
;;;; in another way?
;;;;
(define (make-inner-window-bindings w title button)
  (let ((bd	  15)	;; # of pixels for detecting a border
	(pos-x    0)
	(pos-y    0)
	(index    0)
	(resizing #f)
	(cursors '#("top_left_corner"    "top_side"    "top_right_corner"
		    "left_side"          "crosshair"   "right_side"
		    "bottom_left_corner" "bottom_side" "bottom_right_corner")))
    
    (define (in-inner-window window x y)
      (let* ((w      (winfo 'width  window))
	     (h      (winfo 'height window))
	     (choose (lambda (start)
		       ;; Retain in index the cursor index
		       (set! index (cond ((< x bd)       start)
					 ((< x (- w bd)) (+ start 1))
					 (ELSE		 (+ start 2))))
		       ;; Return the name of the cursor to use
		       (vector-ref cursors index))))

	(slot-set! (slot-ref window 'frame) 'cursor
		   (cond 
		      ((< y bd) 	(choose 0))       ;; 0, 1 or 2
		      ((< y (- h bd)) 	(choose 3))       ;; 3, 4 or 5
		      (ELSE		(choose 6))))))   ;; 6, 7 or 8
    
    (define (resize-inner-window  window x y)
      (unless (or resizing (slot-ref window 'maximized?))
	(set! resizing #t)
	(let* ((width  (winfo 'width  window))
	       (height (winfo 'height window))
	       (parent (parent window))
	       (off-x  (winfo 'rootx parent))
	       (off-y  (winfo 'rooty parent))
	       (x1     (- (winfo 'rootx window) off-x))
	       (y1     (- (winfo 'rooty window) off-y))
	       (x2     (+ x1 width))
	       (y2     (+ y1 height)))
	  (case index
	    ((0) 	   (set! x1 (- x off-x)) (set! y1 (- y off-y)))
	    ((1) 		       		 (set! y1 (- y off-y)))
	    ((2)     (set! x2 (- x off-x)) (set! y1 (- y off-y)))
	    ((3)	   (set! x1 (- x off-x))                      )
	    ((4))    ;;should not occurr
	    ((5) 	   (set! x2 (- x off-x))                      )
	    ((6) 	   (set! x1 (- x off-x)) (set! y2 (- y off-y)))
	    ((7) 		       		 (set! y2 (- y off-y)))
	    ((8) 	   (set! x2 (- x off-x)) (set! y2 (- y off-y))))
	  (place window :in parent :x x1 :y y1 :width (- x2 x1) :height (- y2 y1)))
	(set! resizing #f)))

    ;;;;
    ;;;; MAKE-INNER-WINDOW-BINDINGS starts here
    ;;;; 
    
    ;; The frame
    (let ((f (slot-ref w 'frame)))
      (bind f "<1>"         (lambda ()        (raise w)))
      (bind f "<Enter>"     (lambda (x y)     (in-inner-window w x y)))
      (bind f "<Motion>"    (lambda (x y)     (in-inner-window w x y)))
      (bind f "<B1-Motion>" (lambda (|X| |Y|) (resize-inner-window w |X| |Y|))))

    ;; Title label
    (bind title "<1>" 
	  (lambda (|X| |Y|) (raise w) (set! pos-x |X|) (set! pos-y |Y|)))
    (bind title "<B1-Motion>" 
	  (lambda (|X| |Y|)
	    (unless (slot-ref w 'maximized?)
	      (place w :x (+ (winfo 'x w) (- |X| pos-x)) 
		       :y (+ (winfo 'y w) (- |Y| pos-y)))
	      (set! pos-x |X|)
	      (set! pos-y |Y|)
	      (update 'idle))))
    (bind title "<2>" (lambda ()
			(if (equal? w (slot-ref (parent w) 'current)) 
			    (lower w))))

    ;; The Destroy button
    (bind button "<Double-1>" 
	  (lambda () 
	    ;; Delay instruction to prvent problem with button releasing
	    (after 'idle (lambda () (destroy w)))))))


(define-method place ((self <Inner-window>) . args) 
  (raise self)
  (next-method))


(define-method unselect-window ((self <Inner-Window>))
  (let* ((parent   (parent self))
	 (t        (slot-ref self 'title-label))
	 (color    (slot-ref (slot-ref self 'parent) 'child-unselected-col)))
    (slot-set! parent 'current #f)
    (raise (find-current-window parent self))
    ;; Change title color
    (set! (foreground t) (car color))
    (set! (background t) (cdr color))))


(define-method select-window ((self <Inner-Window>))
  (let* ((parent      (parent self))
	 (current     (slot-ref parent 'current)))
    (unless (equal? self current)
      (let ((t     (slot-ref self 'title-label))
	    (color (slot-ref (slot-ref self 'parent) 'child-selected-col))
	    (title (slot-ref parent 'bottom-bar-title)))
	;; Change old title color
	(when current
	  (let ((t      (slot-ref current 'title-label))
		(color  (slot-ref parent 'child-unselected-col)))
	    (set! (foreground t) (car color))
	    (set! (background t) (cdr color))))
      
	;; Change new title color
	(set! (foreground t) (car color))
	(set! (background t) (cdr color))
	;; Change the title bar text
	(set! (text-of title) (slot-ref self 'title))
	;; New current window is self
	(slot-set! parent 'current self)))))


(define-method raise ((self <Inner-Window>))
  (let* ((parent  (parent self))
	 (current (slot-ref parent 'current)))
    (unless (equal? self current)
      (select-window self)
      ;; Raise this window (but just under the bottom bar)
      (if current 
	  (raise self current)
	  (lower self (slot-ref parent 'bottom-bar))))))

(define-method lower ((self <Inner-Window>))
  (unselect-window self)
  (next-method))

(define-method destroy ((self <Inner-window>))
  (define (delete l) 
    (cond ((null? l) 		   '())
	  ((equal? (car l) self)   (cdr l))
	  (else			   (cons (car l) (delete (cdr l))))))
  
  (let ((parent (slot-ref self 'parent)))
    ;; Delete self from list of children
    (slot-set! parent 'children (delete (slot-ref parent 'children)))
    (unselect-window self)    
    (when (equal? self (slot-ref parent 'current))
      (set! (text-of (slot-ref parent 'bottom-bar-title)) "")
      (slot-set! parent 'current #f)))
  (next-method))


(define-method maximize-window ((self <Inner-Window>))
  (unless (slot-ref self 'maximized?)
    (raise self)
    (slot-set! self 'maximized? #t)
    (slot-set! self 'x      (winfo 'x      self))
    (slot-set! self 'y      (winfo 'y      self))
    (slot-set! self 'width  (winfo 'width  self))
    (slot-set! self 'height (winfo 'height self))
    ; Use pack to fill the cavity
    (pack self :fill "both" :expand #t)
     ;; Change maximize button
    (let ((but (slot-ref self 'maximize-button)))
      (set! (image-of but) *bitmap-min*))))


(define-method minimize-window ((self <Inner-Window>))
  (when (slot-ref self 'maximized?)
    (slot-set! self 'maximized? #f)
    ;; Forget previous pack
    (pack 'forget self)
    (place self :x      (slot-ref self 'x)     
	        :y      (slot-ref self 'y)
	        :width  (slot-ref self 'width)
		:height (slot-ref self 'height))
    ;; Change maximize button
    (let ((but (slot-ref self 'maximize-button)))
      (set! (image-of but) *bitmap-max*))))

(define-method iconify-window ((self <Inner-Window>))
  (unless (slot-ref self 'iconified?)
    (let ((parent (slot-ref self 'parent)))
      (slot-set! self 'iconified? #t)
      (minimize-window self)
      (unselect-window self)
      ; Retain window position before deleting it
      (slot-set! self 'x      (winfo 'x      self))
      (slot-set! self 'y      (winfo 'y      self))
      (slot-set! self 'width  (winfo 'width  self))
      (slot-set! self 'height (winfo 'height self))
      (place 'forget self)

      ;; Create Icon button
      (let* ((bar    (slot-ref parent 'bottom-bar))
	     (title  (slot-ref self 'title))
	     (b      (make <Button> :parent bar :text title
			   :font "-adobe-helvetica-*-r-*-*-*-100-*-*-*-*-*-*"
			   :width  (min (string-length title) 15) :anchor "w"
			   :command (lambda () (show-window self)))))
	(slot-set! self 'icon b)
	(pack b :side "left" :expand #f :fill "none"))

      ;; If this window is alone; purge the bottom bar title
      (when (equal? self (slot-ref parent 'current))
	(set! (text-of (slot-ref parent 'bottom-bar-title)) "")
	(slot-set! parent 'current #f)))))


(define-method show-window ((self <Inner-Window>))
  (when (slot-ref self 'iconified?)
    (slot-set! self 'iconified? #f)
    (place self :x      (slot-ref self 'x)     
	        :y      (slot-ref self 'y)
		:width  (slot-ref self 'width)
		:height (slot-ref self 'height))
    ;; Destroy icon
    (destroy (slot-ref self 'icon))
    ; And raise the window
    (raise self)))