// 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/display_change_notifier.h" #include #include "base/observer_list.h" #include "ui/display/display.h" #include "ui/display/display_observer.h" namespace display { namespace { class DisplayComparator { public: explicit DisplayComparator(const Display& display) : display_id_(display.id()) {} bool operator()(const Display& display) const { return display.id() == display_id_; } private: int64_t display_id_; }; } // anonymous namespace DisplayChangeNotifier::DisplayChangeNotifier() {} DisplayChangeNotifier::~DisplayChangeNotifier() {} void DisplayChangeNotifier::AddObserver(DisplayObserver* obs) { observer_list_.AddObserver(obs); } void DisplayChangeNotifier::RemoveObserver(DisplayObserver* obs) { observer_list_.RemoveObserver(obs); } void DisplayChangeNotifier::NotifyDisplaysChanged( const std::vector& old_displays, const std::vector& new_displays) { bool did_remove_displays = false; // Display present in old_displays but not in new_displays has been removed. for (auto old_it = old_displays.begin(); old_it != old_displays.end(); ++old_it) { if (std::find_if(new_displays.begin(), new_displays.end(), DisplayComparator(*old_it)) == new_displays.end()) { did_remove_displays = true; for (DisplayObserver& observer : observer_list_) observer.OnDisplayRemoved(*old_it); } } if (did_remove_displays) { for (DisplayObserver& observer : observer_list_) observer.OnDidRemoveDisplays(); } // Display present in new_displays but not in old_displays has been added. // Display present in both might have been modified. for (auto new_it = new_displays.begin(); new_it != new_displays.end(); ++new_it) { auto old_it = std::find_if(old_displays.begin(), old_displays.end(), DisplayComparator(*new_it)); if (old_it == old_displays.end()) { for (DisplayObserver& observer : observer_list_) observer.OnDisplayAdded(*new_it); continue; } uint32_t metrics = DisplayObserver::DISPLAY_METRIC_NONE; if (new_it->bounds() != old_it->bounds()) metrics |= DisplayObserver::DISPLAY_METRIC_BOUNDS; if (new_it->rotation() != old_it->rotation()) metrics |= DisplayObserver::DISPLAY_METRIC_ROTATION; if (new_it->work_area() != old_it->work_area()) metrics |= DisplayObserver::DISPLAY_METRIC_WORK_AREA; if (new_it->device_scale_factor() != old_it->device_scale_factor()) metrics |= DisplayObserver::DISPLAY_METRIC_DEVICE_SCALE_FACTOR; if (new_it->color_spaces() != old_it->color_spaces()) metrics |= DisplayObserver::DISPLAY_METRIC_COLOR_SPACE; if (metrics != DisplayObserver::DISPLAY_METRIC_NONE) { for (DisplayObserver& observer : observer_list_) observer.OnDisplayMetricsChanged(*new_it, metrics); } } } void DisplayChangeNotifier::NotifyCurrentWorkspaceChanged( const std::string& workspace) { for (DisplayObserver& observer : observer_list_) observer.OnCurrentWorkspaceChanged(workspace); } } // namespace display