1// Copyright (c) 2013 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 "ash/display/event_transformation_handler.h"
6
7#include <cmath>
8
9#include "ash/display/display_info.h"
10#include "ash/display/display_manager.h"
11#include "ash/shell.h"
12#include "ash/wm/window_util.h"
13#include "ui/aura/window.h"
14#include "ui/aura/window_event_dispatcher.h"
15#include "ui/compositor/dip_util.h"
16#include "ui/events/event.h"
17#include "ui/gfx/display.h"
18#include "ui/gfx/screen.h"
19#include "ui/wm/core/coordinate_conversion.h"
20
21namespace ash {
22namespace {
23
24// Boost factor for non-integrated displays.
25const float kBoostForNonIntegrated = 1.20f;
26
27}  // namespace
28
29EventTransformationHandler::EventTransformationHandler()
30    : transformation_mode_(TRANSFORM_AUTO) {
31}
32
33EventTransformationHandler::~EventTransformationHandler() {
34}
35
36void EventTransformationHandler::OnScrollEvent(ui::ScrollEvent* event) {
37  if (transformation_mode_ == TRANSFORM_NONE)
38    return;
39
40  // It is unnecessary to scale the event for the device scale factor since
41  // the event locations etc. are already in DIP.
42  gfx::Point point_in_screen(event->location());
43  aura::Window* target = static_cast<aura::Window*>(event->target());
44  ::wm::ConvertPointToScreen(target, &point_in_screen);
45  const gfx::Display& display =
46      Shell::GetScreen()->GetDisplayNearestPoint(point_in_screen);
47
48  // Apply some additional scaling if the display is non-integrated.
49  if (!display.IsInternal())
50    event->Scale(kBoostForNonIntegrated);
51}
52
53}  // namespace ash
54