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      1 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 'use strict';
      6 
      7 base.requireStylesheet('tracing.tracks.heading_track');
      8 
      9 base.require('tracing.constants');
     10 base.require('tracing.tracks.track');
     11 base.require('ui');
     12 
     13 base.exportTo('tracing.tracks', function() {
     14   /**
     15    * A track with a header. Provides the basic heading and tooltip
     16    * infrastructure. Subclasses must implement drawing code.
     17    * @constructor
     18    * @extends {HTMLDivElement}
     19    */
     20   var HeadingTrack = ui.define('heading-track', tracing.tracks.Track);
     21 
     22   HeadingTrack.prototype = {
     23     __proto__: tracing.tracks.Track.prototype,
     24 
     25     decorate: function(viewport) {
     26       tracing.tracks.Track.prototype.decorate.call(this, viewport);
     27       this.classList.add('heading-track');
     28 
     29       this.headingDiv_ = document.createElement('heading');
     30       this.headingDiv_.style.width = tracing.constants.HEADING_WIDTH + 'px';
     31       this.appendChild(this.headingDiv_);
     32     },
     33 
     34     get heading() {
     35       return this.headingDiv_.textContent;
     36     },
     37 
     38     set heading(text) {
     39       this.headingDiv_.textContent = text;
     40     },
     41 
     42     set tooltip(text) {
     43       this.headingDiv_.title = text;
     44     },
     45 
     46     draw: function(type, viewLWorld, viewRWorld) {
     47       throw new Error('draw implementation missing');
     48     }
     49   };
     50 
     51   return {
     52     HeadingTrack: HeadingTrack
     53   };
     54 });
     55