stk/Demos/stklos-demo2.stklos

#!/usr/local/bin/stk -f
;;;;
;;;; s t k l o s - d e m o 2 . s t k 	  --  A demo which use some STklos classes
;;;;
;;;; Copyright <20> 1993-1998 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.
;;;;
;;;;           Author: Erick Gallesio [eg@unice.fr]
;;;;    Creation date: 24-Aug-1993 19:55
;;;; Last file update:  3-Mar-1998 17:21

(require "Tk-classes")

;;;; Make canvas
(define f (make <Frame>))
(define l (make <Label>  :parent f :text "A simple demo written in STklos"))
(define c (make <Canvas> :parent f :relief "groove" :height 400 :width 700))
(define m (make <Label>  :parent f :font "fixed" :justify 'left 
		         :text "This demo file illustrates the use of bind-for-dragging with various parameters:
   - Left button to drag any kind of object.
   - Left button with Shift key pressed to drag an object and executes user hooks
   - Right button to move red objects only."))

(define q (make <Button> :text "Quit" :command (lambda () (exit 0))))

(pack l c m q :in f :expand #t :fill 'both)
(pack f)

;;;; Make items 
(define r1 (make <rectangle> :coords '(0 0 50 50) 
		 	     :parent c 
			     :fill "red"
			     :tags "red"))
(define r2 (make <rectangle> :coords '(100 100 150 150) 
		 	     :parent c 
			      :fill "blue"))
(define t  (make <Text-Item> :coords '(80 80) 
		 	     :parent c 
			     :fill "red"
			     :tags "red"
			     :text "Hello world!"))

;; Button 1 for dragging objects
(bind-for-dragging c)

;; Button 1 for dragging objects (with user hooks)
(bind-for-dragging c :tag 'all
		     :modifier "Shift"
		     :start  (lambda (w x y) (format #t "Start to drag ~S\n" w))
		     :motion (lambda (w x y) (format #t "Move ~A ~A\n" x y))
		     :stop   (lambda (w x y) (format #t "Stop with ~S\n" w)))

;; Button 3 for dragging red objects (i.e. r1 and t)
(bind-for-dragging c :tag "red" :button 3)