| // Copyright 2020 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 "content/browser/screen_enumeration/screen_change_monitor.h" |
| |
| #include "build/build_config.h" |
| #include "ui/display/screen.h" |
| |
| namespace content { |
| |
| ScreenChangeMonitor::ScreenChangeMonitor( |
| base::RepeatingCallback<void(bool)> callback) |
| : callback_(callback) { |
| // TODO(crbug.com/1071233): Investigate test failures (crashes?) on Fuchsia. |
| #if !defined(OS_FUCHSIA) |
| if (display::Screen* screen = display::Screen::GetScreen()) { |
| cached_displays_ = screen->GetAllDisplays(); |
| screen->AddObserver(this); |
| } |
| #endif // !OS_FUCHSIA |
| } |
| |
| ScreenChangeMonitor::~ScreenChangeMonitor() { |
| if (display::Screen* screen = display::Screen::GetScreen()) |
| screen->RemoveObserver(this); |
| } |
| |
| 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::OnDisplayRemoved( |
| const display::Display& old_display) { |
| 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 |