Incs/codemirror/addon/display/panel.js

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// 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);
  else // Plain browser env
    mod(CodeMirror);
})(function(CodeMirror) {
  CodeMirror.defineExtension("addPanel", function(node, options) {
    options = options || {};

    if (!this.state.panels) initPanels(this);

    var info = this.state.panels;
    var wrapper = info.wrapper;
    var cmWrapper = this.getWrapperElement();
    var replace = options.replace instanceof Panel && !options.replace.cleared;

    if (options.after instanceof Panel && !options.after.cleared) {
      wrapper.insertBefore(node, options.before.node.nextSibling);
    } else if (options.before instanceof Panel && !options.before.cleared) {
      wrapper.insertBefore(node, options.before.node);
    } else if (replace) {
      wrapper.insertBefore(node, options.replace.node);
      info.panels++;
      options.replace.clear();
    } else if (options.position == "bottom") {
      wrapper.appendChild(node);
    } else if (options.position == "before-bottom") {
      wrapper.insertBefore(node, cmWrapper.nextSibling);
    } else if (options.position == "after-top") {
      wrapper.insertBefore(node, cmWrapper);
    } else {
      wrapper.insertBefore(node, wrapper.firstChild);
    }

    var height = (options && options.height) || node.offsetHeight;
    this._setSize(null, info.heightLeft -= height);
    if (!replace) {
      info.panels++;
    }
    if (options.stable && isAtTop(this, node))
      this.scrollTo(null, this.getScrollInfo().top + height)

    return new Panel(this, node, options, height);
  });

  function Panel(cm, node, options, height) {
    this.cm = cm;
    this.node = node;
    this.options = options;
    this.height = height;
    this.cleared = false;
  }

  Panel.prototype.clear = function() {
    if (this.cleared) return;