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// Copyright 2014 The Chromium Authors
// 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 <algorithm>
#include "base/containers/contains.h"
#include "base/observer_list.h"
#include "build/buildflag.h"
#include "ui/display/display.h"
#include "ui/display/display_observer.h"
namespace display {
DisplayChangeNotifier::DisplayChangeNotifier() = default;
DisplayChangeNotifier::~DisplayChangeNotifier() = default;
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) {
std::vector<Display> removed_displays;
// 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 (!base::Contains(new_displays, old_it->id(), &Display::id)) {
removed_displays.push_back(*old_it);
}
}
if (!removed_displays.empty()) {
observer_list_.Notify(&DisplayObserver::OnDisplaysRemoved,
removed_displays);
}
// 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::ranges::find(old_displays, new_it->id(), &Display::id);
if (old_it == old_displays.end()) {
observer_list_.Notify(&DisplayObserver::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->GetColorSpaces() != old_it->GetColorSpaces()) {
metrics |= DisplayObserver::DISPLAY_METRIC_COLOR_SPACE;
}
if (metrics != DisplayObserver::DISPLAY_METRIC_NONE) {
observer_list_.Notify(&DisplayObserver::OnDisplayMetricsChanged, *new_it,
metrics);
}
}
}
void DisplayChangeNotifier::NotifyCurrentWorkspaceChanged(
const std::string& workspace) {
observer_list_.Notify(&DisplayObserver::OnCurrentWorkspaceChanged, workspace);
}
#if BUILDFLAG(IS_MAC)
void DisplayChangeNotifier::NotifyPrimaryDisplayChanged() {
observer_list_.Notify(&DisplayObserver::OnPrimaryDisplayChanged);
}
#endif
} // namespace display
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