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      1 // Copyright 2014 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 "ui/events/device_data_manager.h"
      6 
      7 #include "base/at_exit.h"
      8 #include "base/bind.h"
      9 #include "base/logging.h"
     10 #include "ui/events/input_device_event_observer.h"
     11 #include "ui/gfx/display.h"
     12 #include "ui/gfx/geometry/point3_f.h"
     13 
     14 namespace ui {
     15 
     16 // static
     17 DeviceDataManager* DeviceDataManager::instance_ = NULL;
     18 
     19 DeviceDataManager::DeviceDataManager() {
     20   CHECK(!instance_) << "Can not create multiple instances of DeviceDataManager";
     21   instance_ = this;
     22 
     23   base::AtExitManager::RegisterTask(
     24       base::Bind(&base::DeletePointer<DeviceDataManager>, this));
     25 
     26   for (int i = 0; i < kMaxDeviceNum; ++i) {
     27     touch_device_to_display_map_[i] = gfx::Display::kInvalidDisplayID;
     28     touch_radius_scale_map_[i] = 1.0;
     29   }
     30 }
     31 
     32 DeviceDataManager::~DeviceDataManager() {
     33   CHECK_EQ(this, instance_);
     34   instance_ = NULL;
     35 }
     36 
     37 // static
     38 DeviceDataManager* DeviceDataManager::instance() { return instance_; }
     39 
     40 // static
     41 void DeviceDataManager::CreateInstance() {
     42   if (instance())
     43     return;
     44 
     45   new DeviceDataManager();
     46 }
     47 
     48 // static
     49 DeviceDataManager* DeviceDataManager::GetInstance() {
     50   CHECK(instance_) << "DeviceDataManager was not created.";
     51   return instance_;
     52 }
     53 
     54 // static
     55 bool DeviceDataManager::HasInstance() {
     56   return instance_ != NULL;
     57 }
     58 
     59 void DeviceDataManager::ClearTouchTransformerRecord() {
     60   for (int i = 0; i < kMaxDeviceNum; i++) {
     61     touch_device_transformer_map_[i] = gfx::Transform();
     62     touch_device_to_display_map_[i] = gfx::Display::kInvalidDisplayID;
     63     touch_radius_scale_map_[i] = 1.0;
     64   }
     65 }
     66 
     67 bool DeviceDataManager::IsTouchDeviceIdValid(int touch_device_id) const {
     68   return (touch_device_id > 0 && touch_device_id < kMaxDeviceNum);
     69 }
     70 
     71 void DeviceDataManager::UpdateTouchInfoForDisplay(
     72     int64_t display_id,
     73     int touch_device_id,
     74     const gfx::Transform& touch_transformer) {
     75   if (IsTouchDeviceIdValid(touch_device_id)) {
     76     touch_device_to_display_map_[touch_device_id] = display_id;
     77     touch_device_transformer_map_[touch_device_id] = touch_transformer;
     78   }
     79 }
     80 
     81 void DeviceDataManager::UpdateTouchRadiusScale(int touch_device_id,
     82                                                double scale) {
     83   if (IsTouchDeviceIdValid(touch_device_id))
     84     touch_radius_scale_map_[touch_device_id] = scale;
     85 }
     86 
     87 void DeviceDataManager::ApplyTouchRadiusScale(int touch_device_id,
     88                                               double* radius) {
     89   if (IsTouchDeviceIdValid(touch_device_id))
     90     *radius = (*radius) * touch_radius_scale_map_[touch_device_id];
     91 }
     92 
     93 void DeviceDataManager::ApplyTouchTransformer(int touch_device_id,
     94                                               float* x,
     95                                               float* y) {
     96   if (IsTouchDeviceIdValid(touch_device_id)) {
     97     gfx::Point3F point(*x, *y, 0.0);
     98     const gfx::Transform& trans =
     99         touch_device_transformer_map_[touch_device_id];
    100     trans.TransformPoint(&point);
    101     *x = point.x();
    102     *y = point.y();
    103   }
    104 }
    105 
    106 int64_t DeviceDataManager::GetDisplayForTouchDevice(int touch_device_id) const {
    107   if (IsTouchDeviceIdValid(touch_device_id))
    108     return touch_device_to_display_map_[touch_device_id];
    109   return gfx::Display::kInvalidDisplayID;
    110 }
    111 
    112 void DeviceDataManager::OnTouchscreenDevicesUpdated(
    113     const std::vector<TouchscreenDevice>& devices) {
    114   touchscreen_devices_ = devices;
    115 
    116   FOR_EACH_OBSERVER(InputDeviceEventObserver,
    117                     observers_,
    118                     OnInputDeviceConfigurationChanged());
    119 }
    120 
    121 void DeviceDataManager::AddObserver(InputDeviceEventObserver* observer) {
    122   observers_.AddObserver(observer);
    123 }
    124 
    125 void DeviceDataManager::RemoveObserver(InputDeviceEventObserver* observer) {
    126   observers_.RemoveObserver(observer);
    127 }
    128 
    129 }  // namespace ui
    130