exo: Run exo in mus+ash

components/exo/wm_helper.cc

 // Copyright 2016 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 "components/exo/wm_helper.h"
 
-#include "ash/common/wm/maximize_mode/maximize_mode_controller.h"
-#include "ash/common/wm_shell.h"
-#include "ash/display/display_manager.h"
-#include "ash/shell.h"
-#include "base/memory/singleton.h"
-#include "ui/aura/client/focus_client.h"
-#include "ui/wm/public/activation_client.h"
+#include "base/memory/ptr_util.h"
+#include "components/exo/wm_helper_ash.h"
+#include "components/exo/wm_helper_mus.h"
 
 namespace exo {
+namespace {
+WMHelper* g_instance = nullptr;
+}
 
 ////////////////////////////////////////////////////////////////////////////////
 // WMHelper, public:
 
 WMHelper::WMHelper() {
-  ash::WmShell::Get()->AddShellObserver(this);
-  ash::Shell::GetInstance()->activation_client()->AddObserver(this);
-  aura::client::FocusClient* focus_client =
-      aura::client::GetFocusClient(ash::Shell::GetPrimaryRootWindow());
-  focus_client->AddObserver(this);
+  DCHECK(!g_instance);
+  g_instance = this;
 }
 
 WMHelper::~WMHelper() {
-  if (!ash::Shell::HasInstance())
-    return;
-  aura::client::FocusClient* focus_client =
-      aura::client::GetFocusClient(ash::Shell::GetPrimaryRootWindow());
-  focus_client->AddObserver(this);
-  focus_client->RemoveObserver(this);
-  ash::Shell::GetInstance()->activation_client()->RemoveObserver(this);
-  ash::WmShell::Get()->RemoveShellObserver(this);
+  DCHECK(g_instance == this);
+  g_instance = nullptr;
+}
+
+// static
+std::unique_ptr<WMHelper> WMHelper::Create(bool using_mus) {

[reveman, 2016/08/17 20:01:41]

Can we add a "void SetInstance(WMHelper* helper)" function instead of this and
manage the lifetime of the instance in ChromeBrowserMainExtraPartsExo? ie.
create the appropriate instance there instead of having to pass a using_mus
flag.

[Peng, 2016/08/17 20:25:36]

Done.

+  if (using_mus)
+    return base::WrapUnique(new WMHelperMus);
+  return base::WrapUnique(new WMHelperAsh);
 }
 
 // static
 WMHelper* WMHelper::GetInstance() {
-  return base::Singleton<WMHelper>::get();
-}
-
-const ash::DisplayInfo& WMHelper::GetDisplayInfo(int64_t display_id) const {
-  return ash::Shell::GetInstance()->display_manager()->GetDisplayInfo(
-      display_id);
-}
-
-// static
-aura::Window* WMHelper::GetContainer(int container_id) {
-  return ash::Shell::GetContainer(ash::Shell::GetTargetRootWindow(),
-                                  container_id);
-}
-
-aura::Window* WMHelper::GetActiveWindow() const {
-  return ash::Shell::GetInstance()->activation_client()->GetActiveWindow();
+  DCHECK(g_instance);
+  return g_instance;
 }
 
 void WMHelper::AddActivationObserver(ActivationObserver* observer) {
   activation_observers_.AddObserver(observer);
 }
 
 void WMHelper::RemoveActivationObserver(ActivationObserver* observer) {
   activation_observers_.RemoveObserver(observer);
 }
 
-aura::Window* WMHelper::GetFocusedWindow() const {
-  aura::client::FocusClient* focus_client =
-      aura::client::GetFocusClient(ash::Shell::GetPrimaryRootWindow());
-  return focus_client->GetFocusedWindow();
-}
-
 void WMHelper::AddFocusObserver(FocusObserver* observer) {
   focus_observers_.AddObserver(observer);
 }
 
 void WMHelper::RemoveFocusObserver(FocusObserver* observer) {
   focus_observers_.RemoveObserver(observer);
 }
 
-ui::CursorSetType WMHelper::GetCursorSet() const {
-  return ash::Shell::GetInstance()->cursor_manager()->GetCursorSet();
-}
-
 void WMHelper::AddCursorObserver(CursorObserver* observer) {
   cursor_observers_.AddObserver(observer);
 }
 
 void WMHelper::RemoveCursorObserver(CursorObserver* observer) {
   cursor_observers_.RemoveObserver(observer);
 }
 
-void WMHelper::AddPreTargetHandler(ui::EventHandler* handler) {
-  ash::Shell::GetInstance()->AddPreTargetHandler(handler);
-}
-
-void WMHelper::PrependPreTargetHandler(ui::EventHandler* handler) {
-  ash::Shell::GetInstance()->PrependPreTargetHandler(handler);
-}
-
-void WMHelper::RemovePreTargetHandler(ui::EventHandler* handler) {
-  ash::Shell::GetInstance()->RemovePreTargetHandler(handler);
-}
-
-void WMHelper::AddPostTargetHandler(ui::EventHandler* handler) {
-  ash::Shell::GetInstance()->AddPostTargetHandler(handler);
-}
-
-void WMHelper::RemovePostTargetHandler(ui::EventHandler* handler) {
-  ash::Shell::GetInstance()->RemovePostTargetHandler(handler);
-}
-
-bool WMHelper::IsMaximizeModeWindowManagerEnabled() const {
-  return ash::WmShell::Get()
-      ->maximize_mode_controller()
-      ->IsMaximizeModeWindowManagerEnabled();
-}
-
 void WMHelper::AddMaximizeModeObserver(MaximizeModeObserver* observer) {
   maximize_mode_observers_.AddObserver(observer);
 }
 
 void WMHelper::RemoveMaximizeModeObserver(MaximizeModeObserver* observer) {
   maximize_mode_observers_.RemoveObserver(observer);
 }
 
-void WMHelper::OnWindowActivated(
-    aura::client::ActivationChangeObserver::ActivationReason reason,
-    aura::Window* gained_active,
-    aura::Window* lost_active) {
+void WMHelper::NotifyWindowActivated(aura::Window* gained_active,
+                                     aura::Window* lost_active) {
   FOR_EACH_OBSERVER(ActivationObserver, activation_observers_,
                     OnWindowActivated(gained_active, lost_active));
 }
 
-void WMHelper::OnWindowFocused(aura::Window* gained_focus,
-                               aura::Window* lost_focus) {
+void WMHelper::NotifyWindowFocused(aura::Window* gained_focus,
+                                   aura::Window* lost_focus) {
   FOR_EACH_OBSERVER(FocusObserver, focus_observers_,
                     OnWindowFocused(gained_focus, lost_focus));
 }
 
-void WMHelper::OnCursorVisibilityChanged(bool is_visible) {
+void WMHelper::NotifyCursorVisibilityChanged(bool is_visible) {
   FOR_EACH_OBSERVER(CursorObserver, cursor_observers_,
                     OnCursorVisibilityChanged(is_visible));
 }
 
-void WMHelper::OnCursorSetChanged(ui::CursorSetType cursor_set) {
+void WMHelper::NotifyCursorSetChanged(ui::CursorSetType cursor_set) {
   FOR_EACH_OBSERVER(CursorObserver, cursor_observers_,
                     OnCursorSetChanged(cursor_set));
 }
 
-void WMHelper::OnMaximizeModeStarted() {
+void WMHelper::NotifyMaximizeModeStarted() {
   FOR_EACH_OBSERVER(MaximizeModeObserver, maximize_mode_observers_,
                     OnMaximizeModeStarted());
 }
 
-void WMHelper::OnMaximizeModeEnded() {
+void WMHelper::NotifyMaximizeModeEnded() {
   FOR_EACH_OBSERVER(MaximizeModeObserver, maximize_mode_observers_,
                     OnMaximizeModeEnded());
 }
 
 }  // namespace exo