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33 lines
1.2 KiB
Common Lisp
33 lines
1.2 KiB
Common Lisp
(defpackage #:clog-user
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(:use #:cl #:clog)
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(:export start-tutorial))
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(in-package :clog-user)
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(defun on-new-window (body)
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"On-new-window handler."
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(setf (title (html-document body)) "Tutorial 3")
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(let ((hello-element
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(create-section body :h1 :content "Hello World! (click me!)")))
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(let ((x 0))
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(set-on-click hello-element
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(lambda (obj)
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(declare (ignore obj))
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(incf x)
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(dotimes (n x)
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(create-p body
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:content (format nil "Clicked ~A times." x))
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(sleep x)))))
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(run body)))
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;;; Running this version of the last tutorial and clicking quickly on the (click me!)
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;;; will demonstrate an important aspect of CLOG, events can happen in _parallel_.
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;;; This means that appropriate precautions to thread protect data should be taken
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;;; and that events do not wait for previous event handlers to complete. One simple
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;;; way to avoid issues is to use the key :one-time t on the set-on-click or other
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;;; event, this will turn off the event immediately when the user clicks and can then
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;;; set the event again when done handling the event if want to again accept the event.
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(defun start-tutorial ()
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"Start turtorial."
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(initialize #'on-new-window)
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(open-browser))
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