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/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" 19 20 #if defined(OS_CHROMEOS) 21 #include "chromeos/display/output_configurator.h" 22 #endif // defined(OS_CHROMEOS) 23 24 namespace ash { 25 namespace internal { 26 namespace { 27 28 // Boost factor for non-integrated displays. 29 const float kBoostForNonIntegrated = 1.20f; 30 } 31 EventTransformationHandler()32EventTransformationHandler::EventTransformationHandler() 33 : transformation_mode_(TRANSFORM_AUTO) { 34 } 35 ~EventTransformationHandler()36EventTransformationHandler::~EventTransformationHandler() { 37 } 38 OnScrollEvent(ui::ScrollEvent * event)39void EventTransformationHandler::OnScrollEvent(ui::ScrollEvent* event) { 40 if (transformation_mode_ == TRANSFORM_NONE) 41 return; 42 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); 50 51 // Apply some additional scaling if the display is non-integrated. 52 if (!display.IsInternal()) 53 event->Scale(kBoostForNonIntegrated); 54 } 55 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 61 // the sqrt of 62 // (mirror_width * mirror_height) / (native_width * native_height) OnTouchEvent(ui::TouchEvent * event)63void EventTransformationHandler::OnTouchEvent(ui::TouchEvent* event) { 64 using chromeos::OutputConfigurator; 65 OutputConfigurator* output_configurator = 66 ash::Shell::GetInstance()->output_configurator(); 67 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) 72 return; 73 74 const std::map<int, float>& area_ratio_map = 75 output_configurator->GetMirroredDisplayAreaRatioMap(); 76 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"; 85 return; 86 } 87 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); 91 } 92 #endif // defined(OS_CHROMEOS) 93 94 } // namespace internal 95 } // namespace ash 96