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* @class elFinder toolbar button to switch full scrren mode.
jQuery.fn.elfinderfullscreenbutton = function(cmd) {
return this.each(function() {
var button = jQuery(this).elfinderbutton(cmd),
icon = button.children('.elfinder-button-icon'),
tm && cancelAnimationFrame(tm);
tm = requestAnimationFrame(function() {
var fullscreen = cmd.value;
icon.addClass('elfinder-button-icon-fullscreen').toggleClass('elfinder-button-icon-unfullscreen', fullscreen);
cmd.className = fullscreen? 'unfullscreen' : '';