components/proximity_auth/webui/resources/log-panel.js

   1 // Copyright 2015 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 Polymer('log-panel', {
   6   publish: {
   7     /**
   8      * List of displayed logs.
   9      * @type {Array<{{
  10      *    text: string,
  11      *    date: string,
  12      *    source: string
  13      * }}>}
  14      */
  15     logs: null,
  16   },
  17
  18   /**
  19    * @type {boolean}
  20    * @private
  21    */
  22   isScrollAtBottom_: true,
  23
  24   /**
  25    * Called after the Polymer element is initialized.
  26    */
  27   ready: function() {
  28     this.$.list.onscroll = this.onScroll_.bind(this);
  29     this.async(this.scrollToBottom_);
  30   },
  31
  32   /**
  33    * Called when the list of logs change.
  34    */
  35   logsChanged: function(oldValue, newValue) {
  36     if (this.isScrollAtBottom_)
  37       this.async(this.scrollToBottom_);
  38   },
  39
  40   /**
  41    * Clears the logs.
  42    * @private
  43    */
  44   clearLogs_: function() {
  45     this.$.logBuffer.clearLogs();
  46   },
  47
  48   /**
  49    * Event handler when the list is scrolled.
  50    * @private
  51    */
  52   onScroll_: function() {
  53     var list = this.$.list;
  54     this.isScrollAtBottom_ =
  55         list.scrollTop + list.offsetHeight == list.scrollHeight;
  56   },
  57
  58   /**
  59    * Scrolls the logs container to the bottom.
  60    * @private
  61    */
  62   scrollToBottom_: function() {
  63     this.$.list.scrollTop = this.$.list.scrollHeight;
  64   },
  65
  66   /**
  67    * @param {string} filename
  68    * @return {string} The filename stripped of its preceeding path.
  69    * @private
  70    */
  71   stripPath_: function(filename) {
  72     var directories = filename.split('/');
  73     return directories[directories.length - 1];
  74   },
  75 });