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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; |
| 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_ += |
| 31 gfx::Vector2dF(std::abs(event.deltaX), std::abs(event.deltaY)); |
| 32 |
| 33 if (decayed_delta_.y() >= decayed_delta_.x()) |
| 34 return WebInputEvent::RailsModeVertical; |
| 35 return WebInputEvent::RailsModeHorizontal; |
| 36 } |
| 37 |
| 38 } // namespace content |
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