blob: 98e135bcf5653fd25ff7c29dbd047d8b26e4167c [file] [log] [blame]
// 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.
#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 {
explicit DisplaySynchronizer(
aura::WindowManagerClient* window_manager_client);
~DisplaySynchronizer() override;
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;
} // namespace ash