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 })(); 78
