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// Copyright 2013 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "ash/display/event_transformation_handler.h"
#include <cmath>
#include "ui/aura/window.h"
#include "ui/aura/window_event_dispatcher.h"
#include "ui/display/display.h"
#include "ui/display/screen.h"
#include "ui/events/event.h"
#include "ui/wm/core/coordinate_conversion.h"
namespace ash {
namespace {
// Boost factor for non-integrated displays.
const float kBoostForNonIntegrated = 1.20f;
} // namespace
EventTransformationHandler::EventTransformationHandler()
: transformation_mode_(TRANSFORM_AUTO) {}
EventTransformationHandler::~EventTransformationHandler() = default;
void EventTransformationHandler::OnScrollEvent(ui::ScrollEvent* event) {
if (transformation_mode_ == TRANSFORM_NONE)
return;
// It is unnecessary to scale the event for the device scale factor since
// the event locations etc. are already in DIP.
gfx::Point point_in_screen(event->location());
aura::Window* target = static_cast<aura::Window*>(event->target());
::wm::ConvertPointToScreen(target, &point_in_screen);
const display::Display& display =
display::Screen::GetScreen()->GetDisplayNearestPoint(point_in_screen);
// Apply some additional scaling if the display is non-integrated.
if (!display.IsInternal())
event->Scale(kBoostForNonIntegrated);
}
} // namespace ash
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