Moving input device hotplug event processing outside of ui/display

ui/display/chromeos/touchscreen_delegate_impl.cc

-// Copyright 2014 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#include "ui/display/chromeos/touchscreen_delegate_impl.h"
-
-#include <cmath>
-#include <set>
-
-#include "ui/display/types/chromeos/display_mode.h"
-#include "ui/display/types/chromeos/display_snapshot.h"
-#include "ui/events/device_data_manager.h"
-
-namespace ui {
-
-TouchscreenDelegateImpl::TouchscreenDelegateImpl() {
-}
-
-TouchscreenDelegateImpl::~TouchscreenDelegateImpl() {}
-
-void TouchscreenDelegateImpl::AssociateTouchscreens(
-    std::vector<DisplayConfigurator::DisplayState>* displays) {
-  std::set<int> no_match_touchscreen;
-  const std::vector<TouchscreenDevice>& devices =
-      DeviceDataManager::GetInstance()->touchscreen_devices();
-
-  int internal_touchscreen = -1;
-  for (size_t i = 0; i < devices.size(); ++i) {
-    if (devices[i].is_internal) {
-      internal_touchscreen = i;
-      break;
-    }
-  }
-
-  DisplayConfigurator::DisplayState* internal_state = NULL;
-  for (size_t i = 0; i < displays->size(); ++i) {
-    DisplayConfigurator::DisplayState* state = &(*displays)[i];
-    if (state->display->type() == DISPLAY_CONNECTION_TYPE_INTERNAL &&
-        state->display->native_mode() &&
-        state->touch_device_id == 0) {
-      internal_state = state;
-      break;
-    }
-  }
-
-  if (internal_state && internal_touchscreen >= 0) {
-    internal_state->touch_device_id = devices[internal_touchscreen].id;
-    VLOG(2) << "Found internal touchscreen for internal display "
-            << internal_state->display->display_id() << " touch_device_id "
-            << internal_state->touch_device_id << " size "
-            << devices[internal_touchscreen].size.ToString();
-  }
-
-  for (size_t i = 0; i < devices.size(); ++i) {
-    if (internal_state &&
-        internal_state->touch_device_id == devices[i].id)
-      continue;
-    bool found_mapping = false;
-    for (size_t j = 0; j < displays->size(); ++j) {
-      DisplayConfigurator::DisplayState* state = &(*displays)[j];
-      const DisplayMode* mode = state->display->native_mode();
-      if (state->touch_device_id != 0 || !mode)
-        continue;
-
-      // Allow 1 pixel difference between screen and touchscreen
-      // resolutions. Because in some cases for monitor resolution
-      // 1024x768 touchscreen's resolution would be 1024x768, but for
-      // some 1023x767. It really depends on touchscreen's firmware
-      // configuration.
-      if (std::abs(mode->size().width() - devices[i].size.width()) <= 1 &&
-          std::abs(mode->size().height() - devices[i].size.height()) <= 1) {
-        state->touch_device_id = devices[i].id;
-
-        VLOG(2) << "Found touchscreen for display "
-                << state->display->display_id() << " touch_device_id "
-                << state->touch_device_id << " size "
-                << devices[i].size.ToString();
-        found_mapping = true;
-        break;
-      }
-    }
-
-    if (!found_mapping) {
-      no_match_touchscreen.insert(devices[i].id);
-      VLOG(2) << "No matching display for touch_device_id "
-              << devices[i].id << " size " << devices[i].size.ToString();
-    }
-  }
-
-  // Sometimes we can't find a matching screen for the touchscreen, e.g.
-  // due to the touchscreen's reporting range having no correlation with the
-  // screen's resolution. In this case, we arbitrarily assign unmatched
-  // touchscreens to unmatched screens.
-  for (std::set<int>::iterator it = no_match_touchscreen.begin();
-       it != no_match_touchscreen.end();
-       ++it) {
-    for (size_t i = 0; i < displays->size(); ++i) {
-      DisplayConfigurator::DisplayState* state = &(*displays)[i];
-      if (state->display->type() != DISPLAY_CONNECTION_TYPE_INTERNAL &&
-          state->display->native_mode() != NULL &&
-          state->touch_device_id == 0) {
-        state->touch_device_id = *it;
-        VLOG(2) << "Arbitrarily matching touchscreen "
-                << state->touch_device_id << " to display "
-                << state->display->display_id();
-        break;
-      }
-    }
-  }
-}
-
-}  // namespace ui