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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/gfx/display_change_notifier.h"
#include <stdint.h>
#include "ui/gfx/display.h"
#include "ui/gfx/display_observer.h"
namespace gfx {
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) {
// Display present in old_displays but not in new_displays has been removed.
std::vector<Display>::const_iterator old_it = old_displays.begin();
for (; old_it != old_displays.end(); ++old_it) {
if (std::find_if(new_displays.begin(), new_displays.end(),
DisplayComparator(*old_it)) == new_displays.end()) {
FOR_EACH_OBSERVER(DisplayObserver, observer_list_,
OnDisplayRemoved(*old_it));
}
}
// Display present in new_displays but not in old_displays has been added.
// Display present in both might have been modified.
for (std::vector<Display>::const_iterator new_it =
new_displays.begin(); new_it != new_displays.end(); ++new_it) {
std::vector<Display>::const_iterator old_it = std::find_if(
old_displays.begin(), old_displays.end(), DisplayComparator(*new_it));
if (old_it == old_displays.end()) {
FOR_EACH_OBSERVER(DisplayObserver, observer_list_,
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 (metrics != DisplayObserver::DISPLAY_METRIC_NONE) {
FOR_EACH_OBSERVER(DisplayObserver,
observer_list_,
OnDisplayMetricsChanged(*new_it, metrics));
}
}
}
} // namespace gfx
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