pro-docs/libs/codemirror/addon/display/fullscreen.js

// CodeMirror, copyright (c) by Marijn Haverbeke and others
// Distributed under an MIT license: https://codemirror.net/LICENSE

;(function (mod) {
    if (typeof exports == 'object' && typeof module == 'object')
        // CommonJS
        mod(require('../../lib/codemirror'))
    else if (typeof define == 'function' && define.amd)
        // AMD
        define(['../../lib/codemirror'], mod)
    // Plain browser env
    else mod(CodeMirror)
})(function (CodeMirror) {
    'use strict'

    CodeMirror.defineOption('fullScreen', false, function (cm, val, old) {
        if (old == CodeMirror.Init) old = false
        if (!old == !val) return
        if (val) setFullscreen(cm)
        else setNormal(cm)
    })

    function setFullscreen(cm) {
        var wrap = cm.getWrapperElement()
        cm.state.fullScreenRestore = { scrollTop: window.pageYOffset, scrollLeft: window.pageXOffset, width: wrap.style.width, height: wrap.style.height }
        wrap.style.width = ''
        wrap.style.height = 'auto'
        wrap.className += ' CodeMirror-fullscreen'
        document.documentElement.style.overflow = 'hidden'
        cm.refresh()
    }

    function setNormal(cm) {
        var wrap = cm.getWrapperElement()
        wrap.className = wrap.className.replace(/\s*CodeMirror-fullscreen\b/, '')
        document.documentElement.style.overflow = ''
        var info = cm.state.fullScreenRestore
        wrap.style.width = info.width
        wrap.style.height = info.height
        window.scrollTo(info.scrollLeft, info.scrollTop)
        cm.refresh()
    }
})