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422adbdd2b
As there is no "pattern matching" for event handling anymore, using cons for event-type makes no sense.
75 lines
2.3 KiB
EmacsLisp
75 lines
2.3 KiB
EmacsLisp
;;; ein-events.el --- Event module
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;; Copyright (C) 2012- Takafumi Arakaki
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;; Author: Takafumi Arakaki
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;; This file is NOT part of GNU Emacs.
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;; ein-events.el is free software: you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation, either version 3 of the License, or
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;; (at your option) any later version.
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;; ein-events.el is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;; You should have received a copy of the GNU General Public License
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;; along with ein-events.el. If not, see <http://www.gnu.org/licenses/>.
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;;; Commentary:
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;;
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;;; Code:
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(eval-when-compile (require 'cl))
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(require 'eieio)
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(require 'ein-log)
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(require 'ein-utils)
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;;; Events handling class
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(defclass ein:events ()
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((buffer :initarg :buffer :type buffer :document "Notebook buffer")
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(callbacks :initarg :callbacks :type hash-table
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:initform (make-hash-table :test 'eq)))
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"Event handler class.")
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(defun ein:events-new (buffer)
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"Return a new event handler instance."
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(ein:events "Events" :buffer buffer))
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(defun ein:events-trigger (events event-type &optional data)
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"Trigger EVENT-TYPE and let event handler EVENTS handle that event."
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(ein:log 'debug "Event: %S" event-type)
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;; Ensure that event is handled in the related buffer.
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;; This helps logging by `ein:log' (and maybe EWOC?).
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(with-current-buffer (oref events :buffer)
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(ein:aif (gethash event-type (oref events :callbacks))
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(mapc (lambda (cb-arg) (ein:funcall-packed cb-arg data)) it)
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(ein:log 'info "Unknown event: %S" event-type))))
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(defmethod ein:events-on ((events ein:events) event-type
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callback &optional arg)
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"Set event trigger hook.
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When EVENT-TYPE is triggered on the event handler EVENTS,
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CALLBACK is called. CALLBACK must take two arguments:
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ARG as the first argument and DATA, which is passed via
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`ein:events-trigger', as the second."
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(assert (symbolp event-type))
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(let* ((table (oref events :callbacks))
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(cbs (gethash event-type table)))
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(push (cons callback arg) cbs)
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(puthash event-type cbs table)))
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(provide 'ein-events)
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;;; ein-events.el ends here
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