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// Copyright 2018 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/common/input/web_mouse_wheel_event_traits.h"
#include "third_party/blink/public/platform/web_input_event.h"
namespace content {
using blink::WebInputEvent;
// static
blink::WebMouseWheelEvent::EventAction WebMouseWheelEventTraits::GetEventAction(
const blink::WebMouseWheelEvent& event) {
#if defined(USE_AURA)
// Scroll events generated from the mouse wheel when the control key is held
// don't trigger scrolling. Instead, they may cause zooming.
if (!event.has_precise_scrolling_deltas &&
(event.GetModifiers() & WebInputEvent::kControlKey)) {
return blink::WebMouseWheelEvent::EventAction::kPageZoom;
}
if (event.delta_x == 0 && (event.GetModifiers() & WebInputEvent::kShiftKey))
return blink::WebMouseWheelEvent::EventAction::kScrollHorizontal;
#endif
if (event.rails_mode == WebInputEvent::kRailsModeHorizontal ||
(event.delta_x != 0 && event.delta_y == 0)) {
return blink::WebMouseWheelEvent::EventAction::kScrollHorizontal;
}
if (event.rails_mode == WebInputEvent::kRailsModeVertical ||
(event.delta_x == 0 && event.delta_y != 0)) {
return blink::WebMouseWheelEvent::EventAction::kScrollVertical;
}
return blink::WebMouseWheelEvent::EventAction::kScroll;
}
} // namespace content
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