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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 #include "content/browser/renderer_host/input/mouse_wheel_rails_filter_mac.h" | |
6 | |
7 using blink::WebInputEvent; | |
8 using blink::WebMouseWheelEvent; | |
9 | |
10 namespace content { | |
11 | |
12 MouseWheelRailsFilterMac::MouseWheelRailsFilterMac() { | |
13 } | |
14 | |
15 MouseWheelRailsFilterMac::~MouseWheelRailsFilterMac() { | |
16 } | |
17 | |
18 WebInputEvent::RailsMode MouseWheelRailsFilterMac::UpdateRailsMode( | |
19 const WebMouseWheelEvent& event) { | |
20 // A somewhat-arbitrary decay constant for hysteresis. | |
21 const float kDecayConstant = 0.8f; | |
jdduke (slow)
2015/03/19 00:21:53
Without hooking this to time, the decay becomes fr
ccameron
2015/03/19 00:42:26
The timestamps are sane, but the main goal of this
| |
22 | |
23 if (event.phase == WebMouseWheelEvent::PhaseBegan) { | |
24 decayed_delta_ = gfx::Vector2dF(); | |
25 } | |
26 if (event.deltaX == 0 && event.deltaY == 0) | |
27 return WebInputEvent::RailsModeFree; | |
28 | |
29 decayed_delta_.Scale(kDecayConstant); | |
30 decayed_delta_ += gfx::Vector2dF(fabsf(event.deltaX), fabsf(event.deltaY)); | |
jdduke (slow)
2015/03/19 00:21:53
std::abs
ccameron
2015/03/19 00:42:26
Done.
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31 | |
32 if (decayed_delta_.y() >= decayed_delta_.x()) | |
33 return WebInputEvent::RailsModeVertical; | |
34 return WebInputEvent::RailsModeHorizontal; | |
35 } | |
36 | |
37 } // namespace content | |
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