Remove --ash-disable-overview-mode

ash/wm/window_cycle_controller.cc

-// Copyright (c) 2012 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/window_cycle_controller.h"
-
-#include <algorithm>
-
-#include "ash/session_state_delegate.h"
-#include "ash/shell.h"
-#include "ash/shell_window_ids.h"
-#include "ash/wm/mru_window_tracker.h"
-#include "ash/wm/window_cycle_list.h"
-#include "ash/wm/window_util.h"
-#include "ash/wm/workspace_controller.h"
-#include "ui/aura/window_event_dispatcher.h"
-#include "ui/events/event.h"
-#include "ui/events/event_handler.h"
-
-namespace ash {
-
-namespace {
-
-// Filter to watch for the termination of a keyboard gesture to cycle through
-// multiple windows.
-class WindowCycleEventFilter : public ui::EventHandler {
- public:
-  WindowCycleEventFilter();
-  virtual ~WindowCycleEventFilter();
-
-  // Overridden from ui::EventHandler:
-  virtual void OnKeyEvent(ui::KeyEvent* event) OVERRIDE;
- private:
-  DISALLOW_COPY_AND_ASSIGN(WindowCycleEventFilter);
-};
-
-// Watch for all keyboard events by filtering the root window.
-WindowCycleEventFilter::WindowCycleEventFilter() {
-}
-
-WindowCycleEventFilter::~WindowCycleEventFilter() {
-}
-
-void WindowCycleEventFilter::OnKeyEvent(ui::KeyEvent* event) {
-  // Views uses VKEY_MENU for both left and right Alt keys.
-  if (event->key_code() == ui::VKEY_MENU &&
-      event->type() == ui::ET_KEY_RELEASED) {
-    Shell::GetInstance()->window_cycle_controller()->AltKeyReleased();
-    // Warning: |this| will be deleted from here on.
-  }
-}
-
-}  // namespace
-
-//////////////////////////////////////////////////////////////////////////////
-// WindowCycleController, public:
-
-WindowCycleController::WindowCycleController() {
-}
-
-WindowCycleController::~WindowCycleController() {
-  StopCycling();
-}
-
-// static
-bool WindowCycleController::CanCycle() {
-  // Don't allow window cycling if the screen is locked or a modal dialog is
-  // open.
-  return !Shell::GetInstance()->session_state_delegate()->IsScreenLocked() &&
-         !Shell::GetInstance()->IsSystemModalWindowOpen();
-}
-
-void WindowCycleController::HandleCycleWindow(Direction direction,
-                                              bool is_alt_down) {
-  if (!CanCycle())
-    return;
-
-  if (is_alt_down) {
-    if (!IsCycling()) {
-      // This is the start of an alt-tab cycle through multiple windows, so
-      // listen for the alt key being released to stop cycling.
-      StartCycling();
-      Step(direction);
-      InstallEventFilter();
-    } else {
-      // We're in the middle of an alt-tab cycle, just step forward.
-      Step(direction);
-    }
-  } else {
-    // This is a simple, single-step window cycle.
-    StartCycling();
-    Step(direction);
-    StopCycling();
-  }
-}
-
-void WindowCycleController::HandleLinearCycleWindow() {
-  if (!CanCycle() || IsCycling())
-    return;
-
-  // Use the reversed list of windows to prevent a 2-cycle of the most recent
-  // windows occurring.
-  WindowCycleList cycle_list(MruWindowTracker::BuildWindowList(true));
-  cycle_list.Step(WindowCycleList::FORWARD);
-}
-
-void WindowCycleController::AltKeyReleased() {
-  StopCycling();
-}
-
-//////////////////////////////////////////////////////////////////////////////
-// WindowCycleController, private:
-
-void WindowCycleController::StartCycling() {
-  windows_.reset(new WindowCycleList(ash::Shell::GetInstance()->
-      mru_window_tracker()->BuildMruWindowList()));
-}
-
-void WindowCycleController::Step(Direction direction) {
-  DCHECK(windows_.get());
-  windows_->Step(direction == FORWARD ? WindowCycleList::FORWARD :
-                 WindowCycleList::BACKWARD);
-}
-
-void WindowCycleController::StopCycling() {
-  windows_.reset();
-  // Remove our key event filter.
-  if (event_handler_) {
-    Shell::GetInstance()->RemovePreTargetHandler(event_handler_.get());
-    event_handler_.reset();
-  }
-}
-
-void WindowCycleController::InstallEventFilter() {
-  event_handler_.reset(new WindowCycleEventFilter());
-  Shell::GetInstance()->AddPreTargetHandler(event_handler_.get());
-}
-
-}  // namespace ash