<!DOCTYPE html>
<!--
Copyright (c) 2015 The Chromium Authors. All rights reserved.
Use of this source code is governed by a BSD-style license that can be
found in the LICENSE file.
-->

<link rel="import" href="/base/base.html">

<script>
'use strict';

/**
 * @fileoverview Provides the LayoutObject class.
 */
tr.exportTo('tr.e.chrome', function() {
  var KNOWN_PROPERTIES = {
    children: 1,
    name: 1,
    address: 1
  };

  /**
   * @constructor
   */
  function LayoutObject(snapshot, args) {
    this.snapshot_ = snapshot;
    this.id_ = args.address;
    this.name_ = args.name;
    this.childLayoutObjects_ = [];
    this.otherProperties_ = {};

    if (args.children) {
      args.children.forEach(function(child) {
        this.childLayoutObjects_.push(new LayoutObject(snapshot, child));
      }.bind(this));
    }

    for (var property in args) {
      if (!KNOWN_PROPERTIES[property])
        this.otherProperties_[property] = args[property];
    }
  }

  LayoutObject.prototype = {
    get snapshot() {
      return this.snapshot_;
    },

    get id() {
      return this.id_;
    },

    get name() {
      return this.name_;
    },

    get hasChildLayoutObjects() {
      return this.childLayoutObjects_.length > 0;
    },

    get childLayoutObjects() {
      return this.childLayoutObjects_;
    },

    traverseTree: function(cb, opt_this) {
      cb.call(opt_this, this);
      if (!this.hasChildLayoutObjects)
        return;
      this.childLayoutObjects.forEach(function(child) {
        child.traverseTree(cb, opt_this);
      });
    },

    get otherPropertyNames() {
      var names = [];
      for (var name in this.otherProperties_) {
        names.push(name);
      }
      return names;
    },

    getProperty: function(name) {
      return this.otherProperties_[name];
    },

    get previousSnapshotLayoutObject() {
      if (!this.snapshot.previousSnapshot)
        return undefined;
      return this.snapshot.previousSnapshot.getLayoutObjectById(this.id);
    },

    get nextSnapshotLayoutObject() {
      if (!this.snapshot.nextSnapshot)
        return undefined;
      return this.snapshot.nextSnapshot.getLayoutObjectById(this.id);
    }
  };

  return {
    LayoutObject: LayoutObject
  };
});
</script>