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- // 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 <stdint.h>
- #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<Display>& old_displays,
- const std::vector<Display>& 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
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