Index: content/browser/renderer_host/input/mouse_wheel_rails_filter_mac.cc |
diff --git a/content/browser/renderer_host/input/mouse_wheel_rails_filter_mac.cc b/content/browser/renderer_host/input/mouse_wheel_rails_filter_mac.cc |
new file mode 100644 |
index 0000000000000000000000000000000000000000..49e424f09f688c85f2c1d5d25940565955c45ae5 |
--- /dev/null |
+++ b/content/browser/renderer_host/input/mouse_wheel_rails_filter_mac.cc |
@@ -0,0 +1,37 @@ |
+// 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. |
+ |
+#include "content/browser/renderer_host/input/mouse_wheel_rails_filter_mac.h" |
+ |
+using blink::WebInputEvent; |
+using blink::WebMouseWheelEvent; |
+ |
+namespace content { |
+ |
+MouseWheelRailsFilterMac::MouseWheelRailsFilterMac() { |
+} |
+ |
+MouseWheelRailsFilterMac::~MouseWheelRailsFilterMac() { |
+} |
+ |
+WebInputEvent::RailsMode MouseWheelRailsFilterMac::UpdateRailsMode( |
+ const WebMouseWheelEvent& event) { |
+ // A somewhat-arbitrary decay constant for hysteresis. |
+ 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
|
+ |
+ if (event.phase == WebMouseWheelEvent::PhaseBegan) { |
+ decayed_delta_ = gfx::Vector2dF(); |
+ } |
+ if (event.deltaX == 0 && event.deltaY == 0) |
+ return WebInputEvent::RailsModeFree; |
+ |
+ decayed_delta_.Scale(kDecayConstant); |
+ 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.
|
+ |
+ if (decayed_delta_.y() >= decayed_delta_.x()) |
+ return WebInputEvent::RailsModeVertical; |
+ return WebInputEvent::RailsModeHorizontal; |
+} |
+ |
+} // namespace content |