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/shell.h" 10 #include "ash/wm/coordinate_conversion.h" 11 #include "ash/wm/window_util.h" 12 #include "ui/aura/window.h" 13 #include "ui/aura/window_event_dispatcher.h" 14 #include "ui/compositor/dip_util.h" 15 #include "ui/events/event.h" 16 #include "ui/gfx/display.h" 17 #include "ui/gfx/screen.h" 18 19 #if defined(OS_CHROMEOS) 20 #include "ui/display/chromeos/display_configurator.h" 21 #endif // defined(OS_CHROMEOS) 22 23 namespace ash { 24 namespace { 25 26 // Boost factor for non-integrated displays. 27 const float kBoostForNonIntegrated = 1.20f; 28 } 29 EventTransformationHandler()30EventTransformationHandler::EventTransformationHandler() 31 : transformation_mode_(TRANSFORM_AUTO) { 32 } 33 ~EventTransformationHandler()34EventTransformationHandler::~EventTransformationHandler() { 35 } 36 OnScrollEvent(ui::ScrollEvent * event)37void EventTransformationHandler::OnScrollEvent(ui::ScrollEvent* event) { 38 if (transformation_mode_ == TRANSFORM_NONE) 39 return; 40 41 // It is unnecessary to scale the event for the device scale factor since 42 // the event locations etc. are already in DIP. 43 gfx::Point point_in_screen(event->location()); 44 aura::Window* target = static_cast<aura::Window*>(event->target()); 45 wm::ConvertPointToScreen(target, &point_in_screen); 46 const gfx::Display& display = 47 Shell::GetScreen()->GetDisplayNearestPoint(point_in_screen); 48 49 // Apply some additional scaling if the display is non-integrated. 50 if (!display.IsInternal()) 51 event->Scale(kBoostForNonIntegrated); 52 } 53 54 #if defined(OS_CHROMEOS) 55 // This is to scale the TouchEvent's radius when the touch display is in 56 // mirror mode. TouchEvent's radius is often reported in the touchscreen's 57 // native resolution. In mirror mode, the touch display could be configured 58 // at a lower resolution. We scale down the radius using the ratio defined as 59 // the sqrt of 60 // (mirror_width * mirror_height) / (native_width * native_height) OnTouchEvent(ui::TouchEvent * event)61void EventTransformationHandler::OnTouchEvent(ui::TouchEvent* event) { 62 using ui::DisplayConfigurator; 63 DisplayConfigurator* display_configurator = 64 ash::Shell::GetInstance()->display_configurator(); 65 66 // Check display_configurator's output_state instead of checking 67 // DisplayManager::IsMirrored() because the compositor based mirroring 68 // won't cause the scaling issue. 69 if (display_configurator->display_state() != 70 ui::MULTIPLE_DISPLAY_STATE_DUAL_MIRROR) 71 return; 72 73 const std::map<int, float>& area_ratio_map = 74 display_configurator->GetMirroredDisplayAreaRatioMap(); 75 76 // TODO(miletus): When there are more than 1 touchscreen (e.g. Link connected 77 // to an external touchscreen), the correct way to do is to have a way 78 // to find out which touchscreen is the event originating from and use the 79 // area ratio of that touchscreen to scale the event's radius. 80 // Tracked here crbug.com/233245 81 if (area_ratio_map.size() != 1) { 82 LOG(ERROR) << "Mirroring mode with " << area_ratio_map.size() 83 << " touch display found"; 84 return; 85 } 86 87 float area_ratio_sqrt = std::sqrt(area_ratio_map.begin()->second); 88 event->set_radius_x(event->radius_x() * area_ratio_sqrt); 89 event->set_radius_y(event->radius_y() * area_ratio_sqrt); 90 } 91 #endif // defined(OS_CHROMEOS) 92 93 } // namespace ash 94