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// Copyright 2015 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// This file provides the DragAction object, which performs drag on a page
// using given start and end positions:
// 1. var action = new __DragAction(callback)
// 2. action.start(drag_options)
'use strict';
(function() {
function DragGestureOptions(opt_options) {
this.element_ = opt_options.element;
this.left_start_ratio_ = opt_options.left_start_ratio;
this.top_start_ratio_ = opt_options.top_start_ratio;
this.left_end_ratio_ = opt_options.left_end_ratio;
this.top_end_ratio_ = opt_options.top_end_ratio;
this.speed_ = opt_options.speed;
this.gesture_source_type_ = opt_options.gesture_source_type;
}
function supportedByBrowser() {
return !!(window.chrome &&
chrome.gpuBenchmarking &&
chrome.gpuBenchmarking.smoothDrag &&
chrome.gpuBenchmarking.visualViewportHeight &&
chrome.gpuBenchmarking.visualViewportWidth);
}
// This class performs drag action using given start and end positions,
// by a single drag gesture.
function DragAction(opt_callback) {
this.beginMeasuringHook = function() {};
this.endMeasuringHook = function() {};
this.callback_ = opt_callback;
}
DragAction.prototype.start = function(opt_options) {
this.options_ = new DragGestureOptions(opt_options);
requestAnimationFrame(this.startGesture_.bind(this));
};
DragAction.prototype.startGesture_ = function() {
this.beginMeasuringHook();
var rect = __GestureCommon_GetBoundingVisibleRect(this.options_.element_);
var start_left =
rect.left + (rect.width * this.options_.left_start_ratio_);
var start_top =
rect.top + (rect.height * this.options_.top_start_ratio_);
var end_left =
rect.left + (rect.width * this.options_.left_end_ratio_);
var end_top =
rect.top + (rect.height * this.options_.top_end_ratio_);
chrome.gpuBenchmarking.smoothDrag(
start_left, start_top, end_left, end_top,
this.onGestureComplete_.bind(this), this.options_.gesture_source_type_,
this.options_.speed_);
};
DragAction.prototype.onGestureComplete_ = function() {
this.endMeasuringHook();
// We're done.
if (this.callback_)
this.callback_();
};
window.__DragAction = DragAction;
window.__DragAction_SupportedByBrowser = supportedByBrowser;
})();
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