sdk/platform-tools/systrace/catapult/telemetry/telemetry/internal/actions/swipe.js

   1 // Copyright 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 (function() {
   8   function SwipeGestureOptions(opt_options) {
   9     if (opt_options) {
  10       this.element_ = opt_options.element;
  11       this.left_start_ratio_ = opt_options.left_start_ratio;
  12       this.top_start_ratio_ = opt_options.top_start_ratio;
  13       this.direction_ = opt_options.direction;
  14       this.distance_ = opt_options.distance;
  15       this.speed_ = opt_options.speed;
  16     } else {
  17       this.element_ = document.body;
  18       this.left_start_ratio_ = 0.5;
  19       this.top_start_ratio_ = 0.5;
  20       this.direction_ = 'left';
  21       this.distance_ = 0;
  22       this.speed_ = 800;
  23     }
  24   }
  25
  26   function supportedByBrowser() {
  27     return !!(window.chrome &&
  28               chrome.gpuBenchmarking &&
  29               chrome.gpuBenchmarking.swipe &&
  30               chrome.gpuBenchmarking.visualViewportHeight &&
  31               chrome.gpuBenchmarking.visualViewportWidth);
  32   }
  33
  34   // This class swipes a page for a specified distance.
  35   function SwipeAction(opt_callback) {
  36     var self = this;
  37
  38     this.beginMeasuringHook = function() {};
  39     this.endMeasuringHook = function() {};
  40
  41     this.callback_ = opt_callback;
  42   }
  43
  44   SwipeAction.prototype.start = function(opt_options) {
  45     this.options_ = new SwipeGestureOptions(opt_options);
  46     // Assign this.element_ here instead of constructor, because the constructor
  47     // ensures this method will be called after the document is loaded.
  48     this.element_ = this.options_.element_;
  49     requestAnimationFrame(this.startGesture_.bind(this));
  50   };
  51
  52   SwipeAction.prototype.startGesture_ = function() {
  53     this.beginMeasuringHook();
  54
  55     var rect = __GestureCommon_GetBoundingVisibleRect(this.options_.element_);
  56     var start_left =
  57         rect.left + rect.width * this.options_.left_start_ratio_;
  58     var start_top =
  59         rect.top + rect.height * this.options_.top_start_ratio_;
  60     chrome.gpuBenchmarking.swipe(this.options_.direction_,
  61                                  this.options_.distance_,
  62                                  this.onGestureComplete_.bind(this),
  63                                  start_left, start_top,
  64                                  this.options_.speed_);
  65   };
  66
  67   SwipeAction.prototype.onGestureComplete_ = function() {
  68     this.endMeasuringHook();
  69
  70     // We're done.
  71     if (this.callback_)
  72       this.callback_();
  73   };
  74
  75   window.__SwipeAction = SwipeAction;
  76   window.__SwipeAction_SupportedByBrowser = supportedByBrowser;
  77 })();