Converts MruWindowTracker to work with common types

ash/wm/mru_window_tracker.cc

 // Copyright 2013 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/wm/mru_window_tracker.h"
 
 #include <algorithm>
 
-#include "ash/aura/wm_window_aura.h"
 #include "ash/common/shell_window_ids.h"
+#include "ash/common/wm/focus_rules.h"
 #include "ash/common/wm/switchable_windows.h"
 #include "ash/common/wm/window_state.h"
-#include "ash/session/session_state_delegate.h"
-#include "ash/shell.h"
-#include "ash/wm/ash_focus_rules.h"
-#include "ash/wm/window_util.h"
-#include "ash/wm/workspace_controller.h"
+#include "ash/common/wm_shell.h"
+#include "ash/common/wm_window.h"
 #include "base/bind.h"
-#include "ui/aura/window_event_dispatcher.h"
-#include "ui/events/event.h"
-#include "ui/events/event_handler.h"
-#include "ui/wm/public/activation_client.h"
 
 namespace ash {
 
 namespace {
 
-typedef base::Callback<bool(aura::Window*)> CanActivateWindowPredicate;
+using CanActivateWindowPredicate = base::Callback<bool(WmWindow*)>;
+
+bool CallCanActivate(WmWindow* window) {
+  return window->CanActivate();
+}
 
 // Adds the windows that can be cycled through for the specified window id to
 // |windows|.
-void AddTrackedWindows(aura::Window* root,
+void AddTrackedWindows(WmWindow* root,
                        int container_id,
                        MruWindowTracker::WindowList* windows) {
-  aura::Window* container = Shell::GetContainer(root, container_id);
-  const MruWindowTracker::WindowList& children(container->children());
+  WmWindow* container = root->GetChildByShellWindowId(container_id);
+  const MruWindowTracker::WindowList children(container->GetChildren());
   windows->insert(windows->end(), children.begin(), children.end());
 }
 
 // Returns whether |w1| should be considered less recently used than |w2|. This
 // is used for a stable sort to move minimized windows to the LRU end of the
 // list.
-bool CompareWindowState(aura::Window* w1, aura::Window* w2) {
-  return ash::wm::IsWindowMinimized(w1) && !ash::wm::IsWindowMinimized(w2);
+bool CompareWindowState(WmWindow* w1, WmWindow* w2) {
+  return w1->GetWindowState()->IsMinimized() &&
+         !w2->GetWindowState()->IsMinimized();
 }
 
 // Returns a list of windows ordered by their stacking order.
 // If |mru_windows| is passed, these windows are moved to the front of the list.
 // It uses the given |should_include_window_predicate| to determine whether to
 // include a window in the returned list or not.
 MruWindowTracker::WindowList BuildWindowListInternal(
-    const std::list<aura::Window*>* mru_windows,
+    const std::list<WmWindow*>* mru_windows,
     const CanActivateWindowPredicate& should_include_window_predicate) {
   MruWindowTracker::WindowList windows;
-  aura::Window::Windows root_windows = Shell::GetAllRootWindows();
-
-  aura::Window* active_root = Shell::GetTargetRootWindow();
-  for (aura::Window::Windows::const_iterator iter = root_windows.begin();
-       iter != root_windows.end(); ++iter) {
-    if (*iter == active_root)
+  WmWindow* active_root = WmShell::Get()->GetRootWindowForNewWindows();
+  for (WmWindow* window : WmShell::Get()->GetAllRootWindows()) {
+    if (window == active_root)
       continue;
     for (size_t i = 0; i < wm::kSwitchableWindowContainerIdsLength; ++i)
-      AddTrackedWindows(*iter, wm::kSwitchableWindowContainerIds[i], &windows);
+      AddTrackedWindows(window, wm::kSwitchableWindowContainerIds[i], &windows);
   }
 
   // Add windows in the active root windows last so that the topmost window
   // in the active root window becomes the front of the list.
   for (size_t i = 0; i < wm::kSwitchableWindowContainerIdsLength; ++i)
     AddTrackedWindows(active_root, wm::kSwitchableWindowContainerIds[i],
                       &windows);
 
   // Removes unfocusable windows.
-  std::vector<aura::Window*>::iterator itr = windows.begin();
+  std::vector<WmWindow*>::iterator itr = windows.begin();
   while (itr != windows.end()) {
     if (!should_include_window_predicate.Run(*itr))
       itr = windows.erase(itr);
     else
       ++itr;
   }
 
   // Put the windows in the mru_windows list at the head, if it's available.
   if (mru_windows) {
     // Iterate through the list backwards, so that we can move each window to
     // the front of the windows list as we find them.
-    for (std::list<aura::Window*>::const_reverse_iterator ix =
-         mru_windows->rbegin();
-         ix != mru_windows->rend(); ++ix) {
+    for (auto ix = mru_windows->rbegin(); ix != mru_windows->rend(); ++ix) {
       // Exclude windows in non-switchable containers and those which cannot
       // be activated.
-      if (!wm::IsSwitchableContainer(WmWindowAura::Get((*ix)->parent())) ||
+      if (!wm::IsSwitchableContainer((*ix)->GetParent()) ||
           !should_include_window_predicate.Run(*ix)) {
         continue;
       }
 
       MruWindowTracker::WindowList::iterator window =
           std::find(windows.begin(), windows.end(), *ix);
       if (window != windows.end()) {
         windows.erase(window);
         windows.push_back(*ix);
       }
     }
   }
 
   // Move minimized windows to the beginning (LRU end) of the list.
   std::stable_sort(windows.begin(), windows.end(), CompareWindowState);
 
   // Window cycling expects the topmost window at the front of the list.
   std::reverse(windows.begin(), windows.end());
 
   return windows;
 }
 
 }  // namespace
 
 //////////////////////////////////////////////////////////////////////////////
 // MruWindowTracker, public:
 
-MruWindowTracker::MruWindowTracker(
-    aura::client::ActivationClient* activation_client,
-    ash::wm::AshFocusRules* focus_rules)
-    : activation_client_(activation_client),
-      focus_rules_(focus_rules),
-      ignore_window_activations_(false) {
-  activation_client_->AddObserver(this);
+MruWindowTracker::MruWindowTracker() : ignore_window_activations_(false) {
+  WmShell::Get()->AddActivationObserver(this);
 }
 
 MruWindowTracker::~MruWindowTracker() {
-  for (std::list<aura::Window*>::iterator iter = mru_windows_.begin();
-       iter != mru_windows_.end(); ++iter) {
-    (*iter)->RemoveObserver(this);
-  }
-
-  activation_client_->RemoveObserver(this);
+  WmShell::Get()->RemoveActivationObserver(this);
+  for (WmWindow* window : mru_windows_)
+    window->RemoveObserver(this);
 }
 
 MruWindowTracker::WindowList MruWindowTracker::BuildMruWindowList() const {
-  return BuildWindowListInternal(&mru_windows_,
-                                 base::Bind(&ash::wm::CanActivateWindow));
+  return BuildWindowListInternal(&mru_windows_, base::Bind(&CallCanActivate));
 }
 
 MruWindowTracker::WindowList
 MruWindowTracker::BuildWindowListIgnoreModal() const {
-  return BuildWindowListInternal(
-      NULL,
-      base::Bind(&MruWindowTracker::IsWindowConsideredActivateable,
-                 base::Unretained(this)));
+  return BuildWindowListInternal(nullptr,
+                                 base::Bind(&IsWindowConsideredActivatable));
 }
 
 void MruWindowTracker::SetIgnoreActivations(bool ignore) {
   ignore_window_activations_ = ignore;
 
   // If no longer ignoring window activations, move currently active window
   // to front.
   if (!ignore)
-    SetActiveWindow(wm::GetActiveWindow());
+    SetActiveWindow(WmShell::Get()->GetActiveWindow());
 }
 
 //////////////////////////////////////////////////////////////////////////////
 // MruWindowTracker, private:
 
-void MruWindowTracker::SetActiveWindow(aura::Window* active_window) {
+void MruWindowTracker::SetActiveWindow(WmWindow* active_window) {
   if (!active_window)
     return;
 
-  std::list<aura::Window*>::iterator iter =
+  std::list<WmWindow*>::iterator iter =
       std::find(mru_windows_.begin(), mru_windows_.end(), active_window);
   // Observe all newly tracked windows.
   if (iter == mru_windows_.end())
     active_window->AddObserver(this);
   else
     mru_windows_.erase(iter);
-  // TODO(flackr): Remove this check if this doesn't fire for a while. This
-  // should verify that all tracked windows start with a layer, see
-  // http://crbug.com/291354.
-  CHECK(active_window->layer());
   mru_windows_.push_front(active_window);
 }
 
-void MruWindowTracker::OnWindowActivated(
-    aura::client::ActivationChangeObserver::ActivationReason reason,
-    aura::Window* gained_active,
-    aura::Window* lost_active) {
+void MruWindowTracker::OnWindowActivated(WmWindow* gained_active,
+                                         WmWindow* lost_active) {
   if (!ignore_window_activations_)
     SetActiveWindow(gained_active);
 }
 
-void MruWindowTracker::OnWindowDestroyed(aura::Window* window) {
+void MruWindowTracker::OnWindowDestroyed(WmWindow* window) {
   // It's possible for OnWindowActivated() to be called after
   // OnWindowDestroying(). This means we need to override OnWindowDestroyed()
   // else we may end up with a deleted window in |mru_windows_|.
   mru_windows_.remove(window);
   window->RemoveObserver(this);
 }
 
-bool MruWindowTracker::IsWindowConsideredActivateable(
-    aura::Window* window) const {
-  return focus_rules_->IsWindowConsideredActivatable(window);
-}
-
 }  // namespace ash