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;;;; Focus management
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;;;; Copyright <20> 1993-1999 Erick Gallesio - I3S-CNRS/ESSI <>
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;;;; Permission to use, copy, modify, distribute,and license this
;;;; software and its documentation for any purpose is hereby granted,
;;;; provided that existing copyright notices are retained in all
;;;; copies and that this notice is included verbatim in any
;;;; distributions. No written agreement, license, or royalty fee is
;;;; required for any of the authorized uses.
;;;; This software is provided ``AS IS'' without express or implied
;;;; warranty.
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;;;; This software is a derivative work of other copyrighted softwares; the
;;;; copyright notices of these softwares are placed in the file COPYRIGHTS
;;;; Author: Erick Gallesio []
;;;; Creation date: 27-Jul-1995 14:10
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;;;; Last file update: 3-Sep-1999 19:51 (eg)
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(select-module Tk)
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;; tk_focusNext --
;; This procedure returns the name of the next window after "w" in
;; "focus order" (the window that should receive the focus next if
;; Tab is typed in w). "Next" is defined by a pre-order search
;; of a top-level and its non-top-level descendants, with the stacking
;; order determining the order of siblings. The "-takefocus" options
;; on windows determine whether or not they should be skipped.
(define Tk:focus-on (lambda (w) #t))
(define Tk:focus-off (lambda (w) #f))
(define Tk:focus-next #f) ; will be redefined below
(define Tk:focus-prev #f) ; will be redefined below
(let ()
(define (all-children w)
(let ((res '()))
(for-each (lambda (x)
(unless (equal? x (winfo 'toplevel x))
;; x is not a toplevel
(set! res (append res (all-children x)))))
(winfo 'children w))
(cons w res)))
(define (focusable? w)
(let ((focus #t)
(value #f))
(if (winfo 'viewable w)
;; 1. See if this window tells something in its :takefocus option
(if (not (catch (set! value (tk-get w :takefocus))))
;; widget has :takefocus option
;; Remark: :takefocus option must be a closure. But original
;; Tcl/Tk code can define the focus action as "0" or "1".
;; Those values can be hard-coded in the Tk library. So take them
;; into account
((boolean? value) (set! focus value))
((closure? value) (set! focus (value w)))))
;; 2. See if the window is not disabled
(if focus
(if (not (catch (set! value (tk-get w :state))))
;; widget has a :state option
(set! focus (not (equal? value "disabled")))))
;; 3. Claim that the window is focuable inly if it exist some
;; keyboard binding associated to it
(if focus
(let ((p (open-output-string)))
(display (bind w) p)
(display (bind (winfo 'class w)) p)
(let ((s (get-output-string p)))
(set! focus (or (string-find? "Key" s)
(string-find? "Focus" s)))))))
;; w is not visible
(set! focus #f))
(define (find-next w l)
(let* ((len (length l))
(index (- len (length (member w l)))))
;; index is the position of the current widget in l
(let loop ((i (modulo (+ index 1) len)))
(if (= i index)
;; not found, return w
(let ((widget (list-ref l i)))
(if (focusable? widget)
(loop (modulo (+ i 1) len))))))))
(set! Tk:focus-next
(lambda (w)
(let ((all (all-children (winfo 'toplevel w))))
(if (= (length all) 1)
(car all)
(find-next w all)))))
(set! Tk:focus-prev
(lambda (w)
(let ((all (all-children (winfo 'toplevel w))))
(if (= (length all) 1)
(car all)
(find-next w (reverse all)))))))
(define (Tk:focus-follows-mouse)
(let ((old (bind "all" "<Enter>"))
(script (lambda(|W| d)
(if (or (equal? d "NotifyAncestor")
(equal? d "NotifyNonlinear")
(equal? d "NotifyInferior"))
(focus |W|)))))
(add-binding "all" "<Enter>" script #f)))