| // Copyright 2017 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. |
| |
| #ifndef ASH_MUS_DISPLAY_SYNCHRONIZER_H_ |
| #define ASH_MUS_DISPLAY_SYNCHRONIZER_H_ |
| |
| #include "ash/display/window_tree_host_manager.h" |
| #include "base/macros.h" |
| #include "ui/display/display_observer.h" |
| |
| namespace aura { |
| class WindowManagerClient; |
| } |
| |
| namespace ash { |
| |
| // DisplaySynchronizer keeps the display state in mus in sync with ash's display |
| // state. As ash controls the overall display state this synchronization is one |
| // way (from ash to mus). |
| class DisplaySynchronizer : public WindowTreeHostManager::Observer, |
| public display::DisplayObserver { |
| public: |
| explicit DisplaySynchronizer( |
| aura::WindowManagerClient* window_manager_client); |
| ~DisplaySynchronizer() override; |
| |
| private: |
| void SendDisplayConfigurationToServer(); |
| |
| // WindowTreeHostManager::Observer: |
| void OnDisplaysInitialized() override; |
| void OnDisplayConfigurationChanged() override; |
| void OnWindowTreeHostReusedForDisplay( |
| AshWindowTreeHost* window_tree_host, |
| const display::Display& display) override; |
| void OnWindowTreeHostsSwappedDisplays(AshWindowTreeHost* host1, |
| AshWindowTreeHost* host2) override; |
| |
| // display::DisplayObserver: |
| void OnWillProcessDisplayChanges() override; |
| void OnDidProcessDisplayChanges() override; |
| void OnDisplayMetricsChanged(const display::Display& display, |
| uint32_t changed_metrics) override; |
| |
| aura::WindowManagerClient* window_manager_client_; |
| |
| bool sent_initial_config_ = false; |
| |
| // Set to true when OnWillProcessDisplayChanges() is called and false in |
| // OnDidProcessDisplayChanges(). DisplayManager calls out while the list of |
| // displays contains both newly added displays and displays that have been |
| // removed. This means if we attempt to access the list of displays during |
| // this time we may get the wrong state (SendDisplayConfigurationToServer() |
| // would send a bogus display to the window server). By only processing the |
| // change after DisplayManager has updated its internal state we ensure we |
| // don't send a bad config. |
| bool processing_display_changes_ = false; |
| |
| DISALLOW_COPY_AND_ASSIGN(DisplaySynchronizer); |
| }; |
| |
| } // namespace ash |
| |
| #endif // ASH_MUS_DISPLAY_SYNCHRONIZER_H_ |