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;; -*- MODE:LISP; Package:CLIO-OPEN; Base:10; Lowercase:T; Fonts:(CPTFONT); Syntax:Common-Lisp -*-
;;;----------------------------------------------------------------------------------+
;;; |
;;; TEXAS INSTRUMENTS INCORPORATED |
;;; P.O. BOX 149149 |
;;; AUSTIN, TEXAS 78714 |
;;; |
;;; Copyright (C) 1989, 1990 Texas Instruments Incorporated. |
;;; |
;;; Permission is granted to any individual or institution to use, copy, modify, and |
;;; distribute this software, provided that this complete copyright and permission |
;;; notice is maintained, intact, in all copies and supporting documentation. |
;;; |
;;; Texas Instruments Incorporated provides this software "as is" without express or |
;;; implied warranty. |
;;; |
;;;----------------------------------------------------------------------------------+
;;; CHOICES:
(in-package "CLIO-OPEN")
(EXPORT '(
choices
choice-default
choice-font
choice-policy
choice-selection
make-choices
))
;;; ============================================================================
;;; T h e C H O I C E S C o n t a c t
;;; ============================================================================
(defcontact choices (table)
((font :type fontable
:accessor choice-font
:initarg :font
:initform nil)
(selection :type (or null contact)
:accessor choice-selection
:initform nil)
(default :type (or null contact symbol)
:accessor choice-default
:initform nil
:initarg :default-selection)
(policy :type (member :always-one :one-or-none)
:accessor choice-policy
:initarg :choice-policy
:initform :one-or-none))
(:resources
font
(default-selection :type symbol :initform nil)
(choice-policy :type (member :always-one :one-or-none)
:initform :one-or-none)
(horizontal-space :initform -1)
(vertical-space :initform -1))
(:documentation
"Allows a user to choose at most one choice item."))
(DEFUN make-choices (&rest initargs &key &allow-other-keys)
(APPLY #'make-contact 'choices initargs))
;; Add our callbacks to each child as it is added, before anybody else gets in ahead of us...
(DEFMETHOD add-child :after ((choices choices) this-child &key)
(flet
(
;;; ===============================================================================
;;;
;;; Our :change-allowed-p callback function...
;;; Applied by a choice-item child when the user tries to change its state
;;; Tells the child whether or not the change may occur
;;;
;;;
(choices-change-allowed-p (to-selected-p choices)
(ECASE (choice-policy choices)
(:always-one (or to-selected-p
;; Following allows deselection of old selection
;; when transitioning to new selection. [See
;; (SETF choice-selection) for details.]
(boundp '*within-setf-choice-selection*)))
(:one-or-none t)))
;;; ===============================================================================
;;;
;;; Our :changing and :canceling-change callback functions...
;;;
(choices-changing (to-selected-p choices self)
(LET((selection (choice-selection choices))
(default (choice-default choices)))
(WHEN (and to-selected-p selection (not (eq selection self)))
;; When transitioning to selected state we must turn off
;; the highlighting of the current choice selection, if any.
(SETF (choice-item-highlight-selected-p selection) nil))
(WHEN (AND default (NOT (EQ self default)))
;; If there is a current choice default then we *may* have
;; to temporarily inhibit display of the default ring.
(UNLESS (and selection to-selected-p)
;; If there is a current selection already and we are
;; transitioning *to* selected state then the current
;; selection must be a toggle button (or some other
;; button whose state is sticky.) In that case the
;; default ring will already have been inhibited by
;; that button's selection. Otherwise we inhibit the
;; the default ring now.
(SETF (choice-item-highlight-default-p default) (not to-selected-p))))))
(choices-canceling-change (to-selected-p choices self)
(LET((selection (choice-selection choices))
(default (choice-default choices)))
(WHEN (and to-selected-p selection)
;; If canceling change to selected state we must restore
;; highlight of old selection (if any)
(SETF (choice-item-highlight-selected-p selection) t))
(WHEN (AND default (NOT (EQ default self)))
;; If we are canceling a transition to "selected" then we
;; must restore the inhibited default ring display.
;; If, on the other hand, we are canceling a transition
;; back to "unselected" then we must once again inhibit
;; default ring display.
(UNLESS (and selection to-selected-p)
;; As in choices-changing, if there is a current selection
;; already inhibiting default ring display then we need not
;; restore display here.
(SETF (choice-item-highlight-default-p default) to-selected-p)))))
;;; ================================================================================
;;; This :off callback deselects currently selected child and
;;; resets the choice selection to NIL. We assume choice policy
;;; enforcement is done elsewhere and so allow deselection even
;; if :always-one.
;;;
(choices-off (choices self)
(DECLARE (IGNORE self))
;; +++ Gross hack until I find out what's really wrong.
(unless (boundp '*within-setf-choice-selection*)
(SETF (choice-selection choices) nil)))
;; ================================================================================
;; This :on callback deselects currently selected child (if any) and
;; resets the choice selection to point to the specified child.
;;
(choices-on (choices self)
(change-choices-selection choices self)))
(let((font (choice-font choices)))
(WHEN font (SETF (choice-item-font this-child) font)))
;; Make this child the default if the child's name is currently the default...
(with-slots (default) choices
(when (and (symbolp default) (eq default (contact-name this-child)))
(setf default nil)
(setf (choice-default choices) this-child)))
(add-callback this-child :change-allowed-p #'choices-change-allowed-p choices)
(add-callback this-child :changing #'choices-changing choices this-child)
(add-callback this-child :canceling-change #'choices-canceling-change choices this-child)
(add-callback this-child :on #'choices-on choices this-child)
(add-callback this-child :off #'choices-off choices this-child)
;; This callback provides a hook used by the menu code.
(apply-callback choices :new-choice-item this-child)))
(defmethod change-layout :after ((choices choices) &optional newly-managed)
(declare (ignore newly-managed))
(with-slots (policy selection children) choices
(unless (realized-p choices)
(when (and (eq policy :always-one) (not selection) children)
(setf (choice-selection choices) (first children))))))
;;; ===============================================================================
;;;
;;; Method to set the default choice item...
;;;
(DEFMETHOD (SETF choice-default) (new-default-choice-item (choices choices))
(with-slots (default children) choices
(UNLESS (EQ new-default-choice-item default)
(ASSERT (MEMBER new-default-choice-item children)
NIL
"New default choice-item ~a is not a child of ~a."
new-default-choice-item choices)
(when default (setf (choice-item-highlight-default-p default) NIL))
(setf default new-default-choice-item)
(setf (choice-item-highlight-default-p default) T)))
new-default-choice-item)
;;; ===============================================================================
;;;
;;; Method to set the selected choice-items...
;;;
;; Assume ALL programmatic changes to the set of selected children come through here so all
;; enforcement of the choice-policy is done here...
(defun change-choices-selection (choices child-to-be-selected)
(declare (type (or null contact) child-to-be-selected))
(with-slots (children selection) (the choices choices)
(unless (eq selection child-to-be-selected)
;; Don't check for compliance while we're in the middle of a change...
(unless (boundp '*within-setf-choice-selection*)
(assert
(or child-to-be-selected (eq (choice-policy choices) :one-or-none)) nil
"Violating :always-one choice policy of choices contact ~a." choices))
(let ((*within-setf-choice-selection* t))
(declare (special *within-setf-choice-selection*))
;; Make sure the caller's selection is indeed a child of ours...
(assert
(or (null child-to-be-selected) (member child-to-be-selected children)) nil
"Selection ~a is not a child of ~a." child-to-be-selected choices)
;; We must do things in just the right order here in case choice
;; policy is :always-one, in which case turning off the old
;; choice-item-selected-p is a bit tricky. In particular, the
;; :change-allowed callback will fail unless we first update the
;; current choices selection with the new value so it knows the
;; choice policy will not be violated.
(let ((old-selection selection))
(when old-selection (setf (choice-item-selected-p old-selection) nil))
(setf selection child-to-be-selected)))))
child-to-be-selected)
(defmethod (setf choice-selection) (child-to-be-selected (choices choices))
(change-choices-selection choices child-to-be-selected)
(when child-to-be-selected
(setf (choice-item-selected-p child-to-be-selected) t))
child-to-be-selected)
;;; ===============================================================================
;;;
;;; Method to force the font of all children...
;;;
(DEFMETHOD (SETF choice-font) (new-value (choices choices))
(with-slots (children font) choices
(IF new-value
(PROGN
(SETF font (find-font choices new-value))
(DOLIST (child children)
(SETF (choice-item-font child) new-value)))
;; Setting font to NIL allows the children to have distinct fonts
;; so we skip resetting choice-item font slots on children.
(SETF font NIL))
new-value)) ;; grh 7/27
;;; ===============================================================================
;;;
;;; Method to set the choice-policy...
;;;
(DEFMETHOD (SETF choice-policy) (new-policy (choices choices))
(with-slots (policy children selection default) choices
(ECASE new-policy
(:always-one ; Make sure one child is selected...
(when (null selection)
(if default
(setf (choice-selection choices) default)
(if children
(setf (choice-selection choices) (first children))
(assert nil nil "~s choices does not have a default or children")))))
(:one-or-none ; Nothing more to do...
nil))
(SETF policy new-policy)
new-policy))
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