114 lines
3.3 KiB
Plaintext
114 lines
3.3 KiB
Plaintext
;;;;
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;;;; B a l l o o n . s t k l o s -- Help-Balloon class definition
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;;;;
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;;;; Copyright © 1996-1998 Erick Gallesio - I3S-CNRS/ESSI <eg@unice.fr>
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;;;;
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;;;; Permission to use, copy, and/or distribute this software and its
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;;;; documentation for any purpose and without fee is hereby granted, provided
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;;;; that both the above copyright notice and this permission notice appear in
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;;;; all copies and derived works. Fees for distribution or use of this
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;;;; software or derived works may only be charged with express written
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;;;; permission of the copyright holder.
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;;;; This software is provided ``as is'' without express or implied warranty.
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;;;;
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;;;; $Id: Balloon.stklos 1.1 Wed, 04 Feb 1998 10:34:59 +0000 eg $
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;;;;
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;;;; Author: Erick Gallesio [eg@unice.fr]
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;;;; Creation date: 23-Oct-1996 17:02
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;;;; Last file update: 3-Feb-1998 19:05
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;;;;
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(require "Basics")
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(select-module STklos+Tk)
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(export add-balloon)
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;=============================================================================
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;
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; <Help-Balloon>
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;
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;=============================================================================
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;;;;
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;;;; Resources
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;;;;
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(option 'add "*HelpBalloon*Background" "#ffffb0" "widgetDefault")
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(option 'add "*HelpBalloon*Font" "fixed" "widgetDefault")
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(option 'add "*HelpBalloon*Relief" "flat" "widgetDefault")
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(option 'add "*HelpBalloon*HighlightThickness" 0 "widgetDefault")
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;;;;
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;;;; Class definition
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;;;;
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(define-class <Help-Balloon> (<Tk-composite-toplevel> <Label>)
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((label :accessor label-of)
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(class :init-keyword :class
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:init-form "HelpBalloon")
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(delay :initform 1000 ; ms
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:init-keyword :delay
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:accessor delay)))
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;;
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;; Initialize-composite-widget
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;;
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(define-method initialize-composite-widget ((self <Help-balloon>) initargs parent)
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(let ((l (make <Label> :parent parent)))
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(next-method)
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;; Withdraw the toplevel and set its override-redirect flag to #t)
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(withdraw parent)
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(slot-set! parent 'override #t)
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;; Pack the label in the parent window
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(pack (Id l) :expand #t :fill "both")
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; Set true slots
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(slot-set! self 'Id (slot-ref l 'Id))
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(slot-set! self 'label l)))
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;;
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;; Add-balloon
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;;
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(define-method add-balloon ((self <Help-Balloon>) who txt)
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(define handler #f)
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(define (display W txt)
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(after 'cancel handler)
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(let ((delay (delay self)))
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(when (>= delay 0)
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(set! handler
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(after delay
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(lambda ()
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(let ((height (winfo 'height W))
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(pos-y (winfo 'rooty W))
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(top (frame-of self)))
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;; Change the help text
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(set! (text-of self) txt)
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;; place the balloon just outside the widget
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(set! (geometry top) (format #f "+~A+~A"
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(winfo 'pointerx W)
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(+ pos-y height 2)))
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;; Deiconify
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(deiconify top)
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(raise top))))))))
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(define (delete)
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(withdraw (frame-of self))
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(after 'cancel handler))
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;; Associate new bindings to a "ballooned" widget
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(bind who "<Enter>" (lambda () (display who txt)))
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(bind who "<Leave>" (lambda () (delete))))
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(provide "Balloon")
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#|
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Example:
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(define b (make <Help-Balloon> :background "PaleGreen"))
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(define b1 (make <Button> :text "B1"))
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(define b2 (make <Button> :text "B2"))
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(pack b1 b2 :side "left")
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(add-balloon b b1 "This is button b1")
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(add-balloon b b2 "This one is\n called b2")
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|#
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