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.
5 #include "ash/display/event_transformation_handler.h"
9 #include "ash/screen_ash.h"
10 #include "ash/shell.h"
11 #include "ash/wm/coordinate_conversion.h"
12 #include "ash/wm/window_util.h"
13 #include "ui/aura/root_window.h"
14 #include "ui/aura/window.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"
20 #if defined(OS_CHROMEOS)
21 #include "chromeos/display/output_configurator.h"
22 #endif // defined(OS_CHROMEOS)
28 // Boost factor for non-integrated displays.
29 const float kBoostForNonIntegrated = 1.20f;
32 EventTransformationHandler::EventTransformationHandler()
33 : transformation_mode_(TRANSFORM_AUTO) {
36 EventTransformationHandler::~EventTransformationHandler() {
39 void EventTransformationHandler::OnScrollEvent(ui::ScrollEvent* event) {
40 if (transformation_mode_ == TRANSFORM_NONE)
43 // It is unnecessary to scale the event for the device scale factor since
44 // the event locations etc. are already in DIP.
45 gfx::Point point_in_screen(event->location());
46 aura::Window* target = static_cast<aura::Window*>(event->target());
47 wm::ConvertPointToScreen(target, &point_in_screen);
48 const gfx::Display& display =
49 Shell::GetScreen()->GetDisplayNearestPoint(point_in_screen);
51 // Apply some additional scaling if the display is non-integrated.
52 if (!display.IsInternal())
53 event->Scale(kBoostForNonIntegrated);
56 #if defined(OS_CHROMEOS)
57 // This is to scale the TouchEvent's radius when the touch display is in
58 // mirror mode. TouchEvent's radius is often reported in the touchscreen's
59 // native resolution. In mirror mode, the touch display could be configured
60 // at a lower resolution. We scale down the radius using the ratio defined as
62 // (mirror_width * mirror_height) / (native_width * native_height)
63 void EventTransformationHandler::OnTouchEvent(ui::TouchEvent* event) {
64 using chromeos::OutputConfigurator;
65 OutputConfigurator* output_configurator =
66 ash::Shell::GetInstance()->output_configurator();
68 // Check output_configurator's output_state instead of checking
69 // DisplayManager::IsMirrored() because the compositor based mirroring
70 // won't cause the scaling issue.
71 if (output_configurator->output_state() != chromeos::STATE_DUAL_MIRROR)
74 const std::map<int, float>& area_ratio_map =
75 output_configurator->GetMirroredDisplayAreaRatioMap();
77 // TODO(miletus): When there are more than 1 touchscreen (e.g. Link connected
78 // to an external touchscreen), the correct way to do is to have a way
79 // to find out which touchscreen is the event originating from and use the
80 // area ratio of that touchscreen to scale the event's radius.
81 // Tracked here crbug.com/233245
82 if (area_ratio_map.size() != 1) {
83 LOG(ERROR) << "Mirroring mode with " << area_ratio_map.size()
84 << " touch display found";
88 float area_ratio_sqrt = std::sqrt(area_ratio_map.begin()->second);
89 event->set_radius_x(event->radius_x() * area_ratio_sqrt);
90 event->set_radius_y(event->radius_y() * area_ratio_sqrt);
92 #endif // defined(OS_CHROMEOS)
94 } // namespace internal