Move DisplayList to display; add ScreenBase.

ui/views/mus/display_list.cc

-// Copyright 2016 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/views/mus/display_list.h"
-
-#include "ui/display/display_finder.h"
-#include "ui/display/display_observer.h"
-
-namespace views {
-
-DisplayList::DisplayList() {}
-
-DisplayList::~DisplayList() {}
-
-void DisplayList::AddObserver(display::DisplayObserver* observer) {
-  observers_.AddObserver(observer);
-}
-
-void DisplayList::RemoveObserver(display::DisplayObserver* observer) {
-  observers_.RemoveObserver(observer);
-}
-
-DisplayList::Displays::const_iterator DisplayList::FindDisplayById(
-    int64_t id) const {
-  for (auto iter = displays_.begin(); iter != displays_.end(); ++iter) {
-    if (iter->id() == id)
-      return iter;
-  }
-  return displays_.end();
-}
-
-DisplayList::Displays::iterator DisplayList::FindDisplayById(int64_t id) {
-  for (auto iter = displays_.begin(); iter != displays_.end(); ++iter) {
-    if (iter->id() == id)
-      return iter;
-  }
-  return displays_.end();
-}
-
-DisplayList::Displays::const_iterator DisplayList::GetPrimaryDisplayIterator()
-    const {
-  return primary_display_index_ == -1
-             ? displays_.end()
-             : displays_.begin() + primary_display_index_;
-}
-
-void DisplayList::UpdateDisplay(const display::Display& display, Type type) {
-  auto iter = FindDisplayById(display.id());
-  DCHECK(iter != displays_.end());
-
-  display::Display* local_display = &(*iter);
-  uint32_t changed_values = 0;
-  if (type == Type::PRIMARY &&
-      static_cast<int>(iter - displays_.begin()) !=
-          static_cast<int>(GetPrimaryDisplayIterator() - displays_.begin())) {
-    primary_display_index_ = static_cast<int>(iter - displays_.begin());
-    // ash::DisplayManager only notifies for the Display gaining primary, not
-    // the one losing it.
-    changed_values |= display::DisplayObserver::DISPLAY_METRIC_PRIMARY;
-  }
-  if (local_display->bounds() != display.bounds()) {
-    local_display->set_bounds(display.bounds());
-    changed_values |= display::DisplayObserver::DISPLAY_METRIC_BOUNDS;
-  }
-  if (local_display->work_area() != display.work_area()) {
-    local_display->set_work_area(display.work_area());
-    changed_values |= display::DisplayObserver::DISPLAY_METRIC_WORK_AREA;
-  }
-  if (local_display->rotation() != display.rotation()) {
-    local_display->set_rotation(display.rotation());
-    changed_values |= display::DisplayObserver::DISPLAY_METRIC_ROTATION;
-  }
-  if (local_display->device_scale_factor() != display.device_scale_factor()) {
-    local_display->set_device_scale_factor(display.device_scale_factor());
-    changed_values |=
-        display::DisplayObserver::DISPLAY_METRIC_DEVICE_SCALE_FACTOR;
-  }
-  FOR_EACH_OBSERVER(display::DisplayObserver, observers_,
-                    OnDisplayMetricsChanged(*local_display, changed_values));
-}
-
-void DisplayList::AddDisplay(const display::Display& display, Type type) {
-  DCHECK(displays_.end() == FindDisplayById(display.id()));
-  displays_.push_back(display);
-  if (type == Type::PRIMARY)
-    primary_display_index_ = static_cast<int>(displays_.size()) - 1;
-  FOR_EACH_OBSERVER(display::DisplayObserver, observers_,
-                    OnDisplayAdded(display));
-}
-
-void DisplayList::RemoveDisplay(int64_t id) {
-  auto iter = FindDisplayById(id);
-  DCHECK(displays_.end() != iter);
-  if (primary_display_index_ == static_cast<int>(iter - displays_.begin())) {
-    // We expect the primary to change before removing it. The only case we
-    // allow removal of the primary is if it is the list display.
-    DCHECK_EQ(1u, displays_.size());
-    primary_display_index_ = -1;
-  } else if (primary_display_index_ >
-             static_cast<int>(iter - displays_.begin())) {
-    primary_display_index_--;
-  }
-  const display::Display display = *iter;
-  displays_.erase(iter);
-  FOR_EACH_OBSERVER(display::DisplayObserver, observers_,
-                    OnDisplayRemoved(display));
-}
-}  // namespace views