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

// codemirror: v.5.61.1

(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);
	else // Plain browser env
		mod(CodeMirror);
})(function(CodeMirror) {
	"use strict";

	CodeMirror.defineOption("scrollPastEnd", false, function(cm, val, old) {
		if (old && old != CodeMirror.Init) {
			cm.off("change", onChange);
			cm.off("refresh", updateBottomMargin);
			cm.display.lineSpace.parentNode.style.paddingBottom = "";
			cm.state.scrollPastEndPadding = null;
		}
		if (val) {
			cm.on("change", onChange);
			cm.on("refresh", updateBottomMargin);
			updateBottomMargin(cm);
		}
	});

	function onChange(cm, change) {
		if (CodeMirror.changeEnd(change).line == cm.lastLine())
			updateBottomMargin(cm);
	}

	function updateBottomMargin(cm) {
		var padding = "";
		if (cm.lineCount() > 1) {
			var totalH = cm.display.scroller.clientHeight - 30,
					lastLineH = cm.getLineHandle(cm.lastLine()).height;
			padding = (totalH - lastLineH) + "px";
		}
		if (cm.state.scrollPastEndPadding != padding) {
			cm.state.scrollPastEndPadding = padding;
			cm.display.lineSpace.parentNode.style.paddingBottom = padding;
			cm.off("refresh", updateBottomMargin);
			cm.setSize();
			cm.on("refresh", updateBottomMargin);
		}
	}
});

// #END
