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;;;; listener.lisp
(in-package #:wheelwork)
(def:class listener ()
(keydown
keyup
mousedown
mouseup
mousemotion
mousewheel
focus
blur
perframe
:ro :prefix :type (or null event-handler) :initform nil)
(keydown-table
keyup-table
mousedown-table
mouseup-table
mousemotion-table
mousewheel-table
focus-table
blur-table
perframe-table
:noarg
:allocation :class
:initform (make-hash-table :synchronized t :test #'eq)
:documentation "Keyed by DISPLAY-UNIT instance, holds an EVENT-HANDLER if
handler is defined for unit."))
(defun listener-table-for (listener event-type)
(ecase event-type
(keydown (keydown-table listener))
(keyup (keyup-table listener))
(mousedown (mousedown-table listener))
(mouseup (mouseup-table listener))
(mousemotion (mousemotion-table listener))
(mousewheel (mousewheel-table listener))
(focus (focus-table listener))
(blur (blur-table listener))
(perframe (perframe-table listener))))
(defun should-listen-for-p (event-type app)
(plusp (hash-table-count (listener-table-for (listener app) event-type))))
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