/usr/share/common-lisp/source/mcclim/input.lisp is in cl-mcclim 0.9.6.dfsg.cvs20100315-2.
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;;; (c) copyright 1998,1999,2000 by Michael McDonald (mikemac@mikemac.com)
;;; (c) copyright 2002 by Gilbert Baumann <unk6@rz.uni-karlsruhe.de>
;;; This library is free software; you can redistribute it and/or
;;; modify it under the terms of the GNU Library General Public
;;; License as published by the Free Software Foundation; either
;;; version 2 of the License, or (at your option) any later version.
;;;
;;; This library is distributed in the hope that it will be useful,
;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
;;; Library General Public License for more details.
;;;
;;; You should have received a copy of the GNU Library General Public
;;; License along with this library; if not, write to the
;;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
;;; Boston, MA 02111-1307 USA.
(in-package :clim-internals)
;;; Input Protocol Classes
;; Event queues
(defclass standard-event-queue ()
((lock :initform (make-lock "event queue")
:reader event-queue-lock)
(head :initform nil
:accessor event-queue-head
:documentation "Head pointer of event queue.")
(tail :initform nil
:accessor event-queue-tail
:documentation "Tail pointer of event queue.")
(processes
:initform (make-condition-variable)
:accessor event-queue-processes
:documentation "Condition variable for waiting processes")
;; experimental extension for scheduled event insersion
(schedule-time
:initform nil
:accessor event-schedule-time
:documentation "The next time an event should be scheduled.")
(schedule
:initform nil
;; :accessor event-queue-schedule
;; this accessor conflicts with the method below.
;; noted by mikemac. I recommend renaming the slot.
;; --GB 2002-11-10
:documentation "Time ordered queue of events to schedule.")))
(defclass port-event-queue (standard-event-queue)
((port :initform nil
:initarg :port
:accessor event-queue-port
:documentation "The port which will be generating events for the queue.")))
(defmethod event-queue-read-no-hang/locked ((eq standard-event-queue))
(check-schedule eq)
(let ((res (pop (event-queue-head eq))))
(when (null (event-queue-head eq))
(setf (event-queue-tail eq) nil))
res))
(defmethod event-queue-read-no-hang ((eq standard-event-queue))
"Reads one event from the queue, if there is no event just return NIL."
(with-lock-held ((event-queue-lock eq))
(event-queue-read-no-hang/locked eq)))
(defmethod event-queue-read ((eq standard-event-queue))
"Reads one event from the queue, if there is no event, hang until here is one."
(let ((lock (event-queue-lock eq)))
(with-lock-held (lock)
(loop
(check-schedule eq)
(let ((res (event-queue-read-no-hang/locked eq)))
(when res
(return res))
;; is there an event waiting to be scheduled?
(with-slots (schedule-time) eq
(let* ((now (now))
(timeout (when schedule-time (- schedule-time now))))
(condition-wait (event-queue-processes eq) lock timeout))))))))
;;; XXX Should we do something with the wait function? I suspect that
;;; it's not compatible with the brave new world of native threads.
(defmethod event-queue-read-with-timeout ((eq standard-event-queue)
timeout wait-function)
(let ((lock (event-queue-lock eq)))
(with-lock-held (lock)
(loop
(check-schedule eq)
(let ((res (event-queue-read-no-hang/locked eq)))
(when res
(return res))
(when wait-function
(warn "event-queue-read-with-timeout ignoring predicate"))
(unless (condition-wait (event-queue-processes eq) lock timeout)
(return)))))))
(defmethod event-queue-append ((eq standard-event-queue) item)
"Append the item at the end of the queue. Does event compression."
(with-lock-held ((event-queue-lock eq))
(labels ((append-event ()
(cond ((null (event-queue-tail eq))
(setf (event-queue-head eq) (cons item nil)
(event-queue-tail eq) (event-queue-head eq)))
(t
(setf (event-queue-tail eq)
(setf (cdr (event-queue-tail eq)) (cons item nil))))))
(event-delete-if (predicate)
(when (not (null (event-queue-head eq)))
(setf (event-queue-head eq)
(delete-if predicate (event-queue-head eq))
(event-queue-tail eq)
(last (event-queue-head eq))))))
(cond
;; Motion Event Compression
;;
;; . find the (at most one) motion event
;; . delete it
;; . append item to queue
;;
;; But leave enter/exit events.
;;
((and (typep item 'pointer-motion-event)
(not (typep item 'pointer-boundary-event)))
(let ((sheet (event-sheet item)))
(event-delete-if
#'(lambda (x)
(and (typep x 'pointer-motion-event)
(not (typep x 'pointer-boundary-event))
(eq (event-sheet x) sheet))))
(append-event)))
;;
;; Resize event compression
;;
((typep item 'window-configuration-event)
(when (typep (event-sheet item) 'top-level-sheet-pane)
(let ((sheet (event-sheet item)))
(event-delete-if
#'(lambda (ev)
(and (typep ev 'window-configuration-event)
(eq (event-sheet ev) sheet)))))
(append-event)))
;;
;; Repaint event compression
;;
((typep item 'window-repaint-event)
(let ((region (window-event-native-region item))
(sheet (event-sheet item))
(did-something-p nil))
(labels ((fun (xs)
(cond ((null xs)
;; We reached the queue's tail: Append the new event, construct a new
;; one if necessary.
(when did-something-p
(setf item
(make-instance 'window-repaint-event
:timestamp (event-timestamp item)
:sheet (event-sheet item)
:region region)))
(setf (event-queue-tail eq) (cons item nil)) )
;;
((and (typep (car xs) 'window-repaint-event)
(eq (event-sheet (car xs)) sheet))
;; This is a repaint event for the same sheet, delete it and combine
;; its region into the new event.
(setf region
(region-union region (window-event-native-region (car xs))))
;; Here is an alternative, which just takes the bounding rectangle.
;; NOTE: When doing this also take care that the new region really
;; is cleared.
;; (setf region
;; (let ((old-region (window-event-native-region (car xs))))
;; (make-rectangle*
;; (min (bounding-rectangle-min-x region)
;; (bounding-rectangle-min-x old-region))
;; (min (bounding-rectangle-min-y region)
;; (bounding-rectangle-min-y old-region))
;; (max (bounding-rectangle-max-x region)
;; (bounding-rectangle-max-x old-region))
;; (max (bounding-rectangle-max-y region)
;; (bounding-rectangle-max-y old-region)))))
(setf did-something-p t)
(fun (cdr xs)))
;;
(t
(setf (cdr xs) (fun (cdr xs)))
xs))))
(setf (event-queue-head eq) (fun (event-queue-head eq))))))
;; Regular events are just appended:
(t (append-event))))
(condition-notify (event-queue-processes eq))))
(defmethod event-queue-prepend ((eq standard-event-queue) item)
"Prepend the item to the beginning of the queue."
(with-lock-held ((event-queue-lock eq))
(cond ((null (event-queue-tail eq))
(setf (event-queue-head eq) (cons item nil)
(event-queue-tail eq) (event-queue-head eq)))
(t
(push item (event-queue-head eq))))
(condition-notify (event-queue-processes eq))))
(defmethod event-queue-peek ((eq standard-event-queue))
(with-lock-held ((event-queue-lock eq))
(check-schedule eq)
(first (event-queue-head eq))))
(defmethod event-queue-peek-if (predicate (eq standard-event-queue))
"Goes thru the whole event queue and returns the first event, which
satisfies 'predicate' and leaves the event in the queue.
Returns NIL, if there is no such event."
(with-lock-held ((event-queue-lock eq))
(find-if predicate (event-queue-head eq))))
(defmethod event-queue-listen ((eq standard-event-queue))
(check-schedule eq)
(not (null (event-queue-head eq))))
(defun now ()
(/ (get-internal-real-time)
internal-time-units-per-second))
(defmethod event-queue-listen-or-wait ((eq standard-event-queue) &key timeout)
(check-schedule eq)
(let ((lock (event-queue-lock eq)))
(with-lock-held (lock)
(with-slots (schedule-time) eq
(flet ((pred ()
(not (null (event-queue-head eq)))))
(cond
(timeout
(loop as timeout-time = (+ now timeout)
with now = (now)
do (when (pred)
(return t))
do (when (>= now timeout-time)
(return nil))
do (let ((timeout (if schedule-time
(min (- schedule-time now)
(- timeout-time now))
(- timeout-time now))))
(condition-wait (event-queue-processes eq)
lock timeout))
do (check-schedule eq)))
(schedule-time
(loop do (when (pred)
(return t))
do (condition-wait
(event-queue-processes eq) lock (- schedule-time (now)))
do (check-schedule eq)))
(t
(or (pred)
(progn
(condition-wait (event-queue-processes eq) lock)
t)))))))))
(defmethod check-schedule ((eq standard-event-queue))
; see if it's time to inject a scheduled event into the queue.
(with-slots (schedule-time schedule) eq
(when (and schedule-time
(> (now) schedule-time))
(let* ((event (pop schedule))
(sheet (pop schedule)))
(setf schedule-time (pop schedule))
(dispatch-event sheet event))
t)))
; ugh. FIXME when I work - build a priority queue or something
(defmethod schedule-event-queue ((eq standard-event-queue) sheet event delay)
(with-slots (schedule-time schedule) eq
(let ((when (+ (now) delay)))
(if schedule
(cond
((< when schedule-time)
(push schedule-time schedule)
(push sheet schedule)
(push event schedule)
(setf schedule-time when))
(t
; (format *trace-output* "queue = ~A~%" schedule)
(do* ((prev (cdr schedule) (cdddr prev))
(point (cddr schedule) (cdddr point))
(time (car point)))
((or (null point)
(< when time))
(setf (cdr prev)
(cons when (cons event (cons sheet (cdr prev)))))))))
(progn
(setf schedule-time when)
(push sheet schedule)
(push event schedule))))))
;; PORT-EVENT-QUEUE methods
(defun do-port-force-output (port-event-queue)
(let ((port (event-queue-port port-event-queue)))
(when port (port-force-output port))))
(defmethod event-queue-read :before ((eq port-event-queue))
(do-port-force-output eq))
(defmethod event-queue-read-no-hang :before ((eq port-event-queue))
(do-port-force-output eq))
(defmethod event-queue-read-with-timeout :before ((eq port-event-queue)
timeout wait-function)
(declare (ignore timeout wait-function))
(do-port-force-output eq))
(defmethod event-queue-listen :before ((eq port-event-queue))
(do-port-force-output eq))
(defmethod event-queue-listen-or-wait :before ((eq standard-event-queue)
&key timeout)
(declare (ignore timeout))
(do-port-force-output eq))
(defmethod event-queue-peek :before ((eq port-event-queue))
(do-port-force-output eq))
(defmethod event-queue-peek-if :before (predicate (eq port-event-queue))
(declare (ignore predicate))
(do-port-force-output eq))
;; STANDARD-SHEET-INPUT-MIXIN
(defclass standard-sheet-input-mixin ()
((queue :initform (make-instance 'port-event-queue)
:reader sheet-event-queue
:initarg :input-buffer)
(port :initform nil
:initarg :port
:reader port)))
(defmethod stream-input-buffer ((stream standard-sheet-input-mixin))
(sheet-event-queue stream))
(defmethod (setf stream-input-buffer) (new-val
(stream standard-sheet-input-mixin))
(setf (slot-value stream 'queue) new-val))
;(defmethod dispatch-event ((sheet standard-sheet-input-mixin) event)
; (if (typep event 'device-event)
; (queue-event sheet event)
; (handle-event sheet event)))
(defmethod dispatch-event ((sheet standard-sheet-input-mixin) event)
(queue-event sheet event))
(defmethod queue-event ((sheet standard-sheet-input-mixin) event)
(with-slots (queue) sheet
(event-queue-append queue event)))
(defmethod schedule-event ((sheet standard-sheet-input-mixin) event delay)
(with-slots (queue) sheet
(schedule-event-queue queue sheet event delay)))
(defmethod handle-event ((sheet standard-sheet-input-mixin) event)
;; Standard practice is to ignore events
(declare (ignore event))
nil)
(defmethod event-read ((sheet standard-sheet-input-mixin))
(with-slots (queue) sheet
(event-queue-read queue)))
(defmethod event-read-with-timeout ((sheet standard-sheet-input-mixin)
&key (timeout nil) (wait-function nil))
;; This one is not in the spec ;-( --GB
(with-slots (queue) sheet
(event-queue-read-with-timeout queue timeout wait-function)))
(defmethod event-read-no-hang ((sheet standard-sheet-input-mixin))
(with-slots (queue) sheet
(event-queue-read-no-hang queue)))
(defmethod event-peek ((sheet standard-sheet-input-mixin) &optional event-type)
(with-slots (queue) sheet
(if event-type
(event-queue-peek-if (lambda (x)
(typep x event-type))
queue)
(event-queue-peek-if (lambda (x) (declare (ignore x)) t)
queue))))
(defmethod event-unread ((sheet standard-sheet-input-mixin) event)
(with-slots (queue) sheet
(event-queue-prepend queue event)))
(defmethod event-listen ((sheet standard-sheet-input-mixin))
(with-slots (queue) sheet
(event-queue-listen queue)))
;;;;
;;; Support for callers that want to set an event queue for every pane.
(defclass no-event-queue-mixin ()
())
(defmethod initialize-instance :after ((obj no-event-queue-mixin)
&key input-buffer)
(declare (ignore input-buffer))
nil)
(defmethod (setf stream-input-buffer) (new-val (stream no-event-queue-mixin))
new-val)
(defclass immediate-sheet-input-mixin (no-event-queue-mixin)
())
(defmethod dispatch-event ((sheet immediate-sheet-input-mixin) event)
(handle-event sheet event))
(defmethod handle-event ((sheet immediate-sheet-input-mixin) event)
(declare (ignore event))
nil)
(define-condition sheet-is-mute-for-input (error)
())
(defclass sheet-mute-input-mixin (no-event-queue-mixin)
())
(defmethod dispatch-event ((sheet sheet-mute-input-mixin) event)
(declare (ignore event))
(error 'sheet-is-mute-for-input))
(defmethod queue-event ((sheet sheet-mute-input-mixin) event)
(declare (ignore event))
(error 'sheet-is-mute-for-input))
(defmethod schedule-event ((sheet sheet-mute-input-mixin) event delay)
(declare (ignore event delay))
(error 'sheet-is-mute-for-input))
(defmethod handle-event ((sheet sheet-mute-input-mixin) event)
(declare (ignore event))
(error 'sheet-is-mute-for-input))
(defmethod event-read ((sheet sheet-mute-input-mixin))
(error 'sheet-is-mute-for-input))
(defmethod event-read-with-timeout ((sheet sheet-mute-input-mixin)
&key (timeout nil) (wait-function nil))
(declare (ignore timeout wait-function))
(error 'sheet-is-mute-for-input))
(defmethod event-read-no-hang ((sheet sheet-mute-input-mixin))
(error 'sheet-is-mute-for-input))
(defmethod event-peek ((sheet sheet-mute-input-mixin) &optional event-type)
(declare (ignore event-type))
(error 'sheet-is-mute-for-input))
(defmethod event-unread ((sheet sheet-mute-input-mixin) event)
(declare (ignore event))
(error 'sheet-is-mute-for-input))
(defmethod event-listen ((sheet sheet-mute-input-mixin))
(error 'sheet-is-mute-for-input))
;;;;
(defclass delegate-sheet-input-mixin ()
((delegate :initform nil
:initarg :delegate
:accessor delegate-sheet-delegate) ))
;;; Don't know if this event queue stuff is completely right, or if it matters
;;; much...
(defmethod initialize-instance :after ((obj delegate-sheet-input-mixin)
&key input-buffer)
(declare (ignore input-buffer)))
(defmethod stream-input-buffer ((stream delegate-sheet-input-mixin))
(sheet-event-queue (delegate-sheet-delegate stream)))
(defmethod (setf stream-input-buffer) (new-val
(stream delegate-sheet-input-mixin))
(setf (stream-input-buffer (delegate-sheet-delegate stream)) new-val))
(defmethod dispatch-event ((sheet delegate-sheet-input-mixin) event)
(dispatch-event (delegate-sheet-delegate sheet) event))
(defmethod queue-event ((sheet delegate-sheet-input-mixin) event)
(queue-event (delegate-sheet-delegate sheet) event))
(defmethod schedule-event ((sheet delegate-sheet-input-mixin) event delay)
(schedule-event (delegate-sheet-delegate sheet) event delay))
(defmethod handle-event ((sheet delegate-sheet-input-mixin) event)
(handle-event (delegate-sheet-delegate sheet) event))
(defmethod event-read ((sheet delegate-sheet-input-mixin))
(event-read (delegate-sheet-delegate sheet)))
(defmethod event-read-with-timeout ((sheet delegate-sheet-input-mixin)
&key (timeout nil) (wait-function nil))
(event-read-with-timeout (delegate-sheet-delegate sheet)
:timeout timeout :wait-function wait-function))
(defmethod event-read-no-hang ((sheet delegate-sheet-input-mixin))
(event-read-no-hang (delegate-sheet-delegate sheet)))
(defmethod event-peek ((sheet delegate-sheet-input-mixin) &optional event-type)
(event-peek (delegate-sheet-delegate sheet) event-type))
(defmethod event-unread ((sheet delegate-sheet-input-mixin) event)
(event-unread (delegate-sheet-delegate sheet) event))
(defmethod event-listen ((sheet delegate-sheet-input-mixin))
(event-listen (delegate-sheet-delegate sheet)))
;;; Class actually used by panes.
(defclass clim-sheet-input-mixin (standard-sheet-input-mixin)
())
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