polygerrit-ui/app/elements/gr-diff-comment-thread.html

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Copyright (C) 2015 The Android Open Source Project

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
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<link rel="import" href="../bower_components/polymer/polymer.html">
<link rel="import" href="gr-diff-comment.html">

<dom-module id="gr-diff-comment-thread">
  <template>
    <style>
      :host {
        display: block;
        max-width: 50em;
        white-space: normal;
      }
    </style>
    <template id="commentList" is="dom-repeat" items="{{_orderedComments}}" as="comment">
      <gr-diff-comment comment="[[comment]]"></gr-diff-comment>
    </template>
  </template>
  <script>
  (function() {
    'use strict';


    Polymer({
      is: 'gr-diff-comment-thread',

      /**
       * Fired when the height of the thread changes.
       *
       * @event gr-diff-comment-thread-height-changed
       */

      properties: {
        comments: {
          type: Array,
          observer: '_commentsChanged',
        },
        _orderedComments: Array,
      },

      ready: function() {
        this.addEventListener('gr-diff-comment-height-changed',
            this._handleCommentHeightChange.bind(this));
      },

      _commentsChanged: function(comments) {
        this._orderedComments = this._sortedComments(comments);
      },

      _sortedComments: function(comments) {
        var comments = comments || [];
        comments.sort(function(c1, c2) {
          return util.parseDate(c1.updated) - util.parseDate(c2.updated);
        });

        var commentIDToReplies = {};
        var topLevelComments = [];
        for (var i = 0; i < comments.length; i++) {
          var c = comments[i];
          if (c.in_reply_to) {
            if (commentIDToReplies[c.in_reply_to] == null) {
              commentIDToReplies[c.in_reply_to] = [];
            }
            commentIDToReplies[c.in_reply_to].push(c);
          } else {
            topLevelComments.push(c);
          }
        }
        var results = [];
        for (var i = 0; i < topLevelComments.length; i++) {
          this._visitComment(topLevelComments[i], commentIDToReplies, results);
        }
        return results;
      },

      _visitComment: function(parent, commentIDToReplies, results) {
        results.push(parent);

        var replies = commentIDToReplies[parent.id];
        if (!replies) { return; }
        for (var i = 0; i < replies.length; i++) {
          this._visitComment(replies[i], commentIDToReplies, results);
        }
      },

      _handleCommentHeightChange: function(e) {
        // TODO: This fires for each comment on initialization. Optimize to only
        // fire the top level "thread height has changed" event once during
        // initial DOM stamp.
        this.fire('gr-diff-comment-thread-height-changed',
            {height: this.offsetHeight});
      },

    });
  })();
  </script>
</dom-module>