1999-02-02 06:13:40 -05:00
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;;;;
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;;;; b a l l o o n . s t k -- balloon help
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;;;;
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;;;; Copyright <20> 1998-1999 Erick Gallesio - I3S-CNRS/ESSI <eg@unice.fr>
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;;;;
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1999-09-05 07:16:41 -04:00
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;;;; Permission to use, copy, modify, distribute,and license this
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;;;; software and its documentation for any purpose is hereby granted,
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;;;; provided that existing copyright notices are retained in all
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;;;; copies and that this notice is included verbatim in any
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;;;; distributions. No written agreement, license, or royalty fee is
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;;;; required for any of the authorized uses.
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;;;; This software is provided ``AS IS'' without express or implied
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;;;; warranty.
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1999-02-02 06:13:40 -05:00
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;;;;
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;;;; Author: Erick Gallesio [eg@unice.fr]
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;;;; Creation date: 11-Dec-1998 18:00
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1999-09-05 07:16:41 -04:00
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;;;; Last file update: 3-Sep-1999 19:48 (eg)
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1999-02-02 06:13:40 -05:00
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(select-module Tk)
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(export add-balloon-help activate-balloons deactivate-balloons find-balloon-help)
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;;;;
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;;;; Resources (FIXME: background does not work. why? Tk bug?)
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;;;;
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(option 'add "*HelpBalloon*Label*Background" "#ffffb0" "widgetDefault")
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(option 'add "*HelpBalloon*Label*Foreground" "black" "widgetDefault")
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(option 'add "*HelpBalloon*Label*BorderWidth" 1 "widgetDefault")
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(option 'add "*HelpBalloon*Font" '(Courier -12) "widgetDefault")
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(option 'add "*HelpBalloon*Relief" "solid" "widgetDefault")
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(option 'add "*HelpBalloon*HighlightThickness" 0 "widgetDefault")
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;;;;
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;;;; Globals
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;;;;
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(define *balloon-handler* #f)
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(define *balloon-top* #f)
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(define *balloon-label* #f)
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(define (initialize-balloon)
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(set! *balloon-top* (toplevel ".__balloon__" :class "HelpBalloon"))
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(set! *balloon-label* (label (& *balloon-top* ".l") :padx 3 :pady 2))
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(pack *balloon-label* :expand #f :fill "both")
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(activate-balloons)
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; make widget transient
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(wm 'withdraw *balloon-top*)
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(wm 'over *balloon-top* #t))
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(define (activate-balloons)
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(bind "Balloon" "<Enter>" (lambda (|W|) (display-balloon-help |W|)))
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(bind "Balloon" "<Leave>" (lambda (|W|) (delete-balloon-help |W|))))
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(define (deactivate-balloons)
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(bind "Balloon" "<Enter>" "")
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(bind "Balloon" "<Leave>" ""))
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(define (add-balloon-help w txt delay bg)
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(unless *balloon-top*
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(initialize-balloon))
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;; store parameters in widget and make it a "Balloon" widget
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(set-widget-property! w :balloon-txt txt)
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(set-widget-property! w :balloon-delay delay)
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(set-widget-property! w :balloon-bg bg)
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(bindtags w (cons "Balloon" (remove "Balloon" (bindtags w)))))
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(define (find-balloon-help)
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(unless *balloon-label*
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(initialize-balloon))
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*balloon-label*)
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(define (display-balloon-help w)
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(after 'cancel *balloon-handler*)
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(let ((delay (get-widget-property w :balloon-delay -1))
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(txt (get-widget-property w :balloon-txt ""))
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(bg (get-widget-property w :balloon-bg "")))
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(when (>= delay 0)
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(set! *balloon-handler*
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(after delay
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(lambda ()
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1999-09-05 07:16:41 -04:00
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(when (winfo 'exists w)
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(let* ((height (winfo 'height w))
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(pos-y (winfo 'rooty w)))
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(*balloon-label* 'conf :text txt :bg bg)
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;; place the balloon just outside the widget
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(wm 'geometry *balloon-top*
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(format #f "+~A+~A"
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(winfo 'pointerx w) (+ pos-y height 2)))
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;; required for windows, otherwise it appears at top left
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(update)
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;; Deiconify
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(wm 'deiconify *balloon-top*)
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(raise *balloon-top*)
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(eventually-delete-ballon-help w)))))))))
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(define (eventually-delete-ballon-help w)
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;; Delete the ballon if the window to which the balloon is assocaited does not
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;; Exist anymore.
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(if (winfo 'exists w)
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(set! *balloon-handler*
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(after 800 (lambda () (eventually-delete-ballon-help w))))
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(delete-balloon-help w)))
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1999-02-02 06:13:40 -05:00
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(define (delete-balloon-help w)
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(wm 'withdraw *balloon-top*)
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(after 'cancel *balloon-handler*))
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(provide "balloon")
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#|
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(button '.b1 :text "foo")
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(button '.b2 :text "bar")
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(pack .b1 .b2)
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(add-balloon-help .b1 "On several\nlines\n..." 10 "yellow")
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(add-balloon-help .b2 "This is help" 1000 "red")
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|#
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