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content / browser / screen_details / screen_change_monitor.cc [blame]
// Copyright 2020 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "content/browser/screen_details/screen_change_monitor.h"
#include "ui/display/screen.h"
namespace content {
ScreenChangeMonitor::ScreenChangeMonitor(
base::RepeatingCallback<void(bool)> callback)
: callback_(callback) {
if (display::Screen* screen = display::Screen::GetScreen())
cached_displays_ = screen->GetAllDisplays();
}
ScreenChangeMonitor::~ScreenChangeMonitor() = default;
void ScreenChangeMonitor::OnScreensChange() {
if (display::Screen* screen = display::Screen::GetScreen()) {
const auto& displays = screen->GetAllDisplays();
if (cached_displays_ == displays)
return;
const bool is_multi_screen_changed =
(cached_displays_.size() > 1) != (displays.size() > 1);
cached_displays_ = displays;
callback_.Run(is_multi_screen_changed);
}
}
void ScreenChangeMonitor::OnDisplayAdded(const display::Display& new_display) {
OnScreensChange();
}
void ScreenChangeMonitor::OnDisplaysRemoved(
const display::Displays& /*removed_displays*/) {
OnScreensChange();
}
void ScreenChangeMonitor::OnDisplayMetricsChanged(
const display::Display& display,
uint32_t changed_metrics) {
// TODO(msw): Use the |changed_metrics| parameter to disregard some changes.
OnScreensChange();
}
} // namespace content