ash/accelerators/accelerator

/* [<][>][^][v][top][bottom][index][help] */
This source file includes following definitions.
DebugShortcutsEnabled
HandleAccessibleFocusCycle
HandleCycleBackwardMRU
HandleCycleForwardMRU
ToggleOverview
HandleFocusLauncher
HandleLaunchAppN
HandleLaunchLastApp
HandleMagnifyScreen
HandleMediaNextTrack
HandleMediaPlayPause
HandleMediaPrevTrack
HandleNewIncognitoWindow
HandleNewTab
HandleNewWindow
HandleNextIme
HandleOpenFeedbackPage
HandlePositionCenter
HandlePreviousIme
HandleRestoreTab
HandleRotatePaneFocus
HandleRotateActiveWindow
GetNextRotation
HandleRotateScreen
HandleScaleReset
HandleScaleUI
HandleSwapPrimaryDisplay
HandleShowKeyboardOverlay
HandleShowMessageCenterBubble
HandleShowSystemTrayBubble
HandleShowTaskManager
HandleSilenceSpokenFeedback
HandleSwitchIme
HandleTakePartialScreenshot
HandleTakeScreenshot
HandleToggleAppList
HandleToggleFullscreen
HandleToggleRootWindowFullScreen
HandleWindowSnap
HandleWindowMinimize
HandleAddRemoveDisplay
HandleCrosh
HandleFileManager
HandleLock
HandleCycleUser
HandleToggleMirrorMode
HandleToggleSpokenFeedback
HandleToggleTouchViewTesting
HandleTouchHudClear
HandleTouchHudModeChange
HandleTouchHudProjectToggle
HandleDisableCapsLock
HandleToggleCapsLock
HandlePrintLayerHierarchy
HandlePrintViewHierarchy
PrintWindowHierarchy
HandlePrintWindowHierarchy
HandlePrintUIHierarchies
UpdateContext
Init
Register
Unregister
UnregisterAll
Process
IsRegistered
IsReservedAccelerator
PerformAction
SetBrightnessControlDelegate
SetImeControlDelegate
SetScreenshotDelegate
AcceleratorPressed
RegisterAccelerators
SetKeyboardBrightnessControlDelegate
CanHandleAccelerators
// 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/accelerators/accelerator_controller.h"

#include <algorithm>
#include <cmath>
#include <iostream>
#include <string>

#include "ash/accelerators/accelerator_commands.h"
#include "ash/accelerators/accelerator_table.h"
#include "ash/accelerators/debug_commands.h"
#include "ash/ash_switches.h"
#include "ash/debug.h"
#include "ash/display/display_controller.h"
#include "ash/display/display_manager.h"
#include "ash/focus_cycler.h"
#include "ash/gpu_support.h"
#include "ash/ime_control_delegate.h"
#include "ash/magnifier/magnification_controller.h"
#include "ash/magnifier/partial_magnification_controller.h"
#include "ash/media_delegate.h"
#include "ash/multi_profile_uma.h"
#include "ash/new_window_delegate.h"
#include "ash/root_window_controller.h"
#include "ash/rotator/screen_rotation.h"
#include "ash/screenshot_delegate.h"
#include "ash/session_state_delegate.h"
#include "ash/shelf/shelf.h"
#include "ash/shelf/shelf_delegate.h"
#include "ash/shelf/shelf_model.h"
#include "ash/shelf/shelf_widget.h"
#include "ash/shell.h"
#include "ash/shell_delegate.h"
#include "ash/shell_window_ids.h"
#include "ash/system/brightness_control_delegate.h"
#include "ash/system/keyboard_brightness/keyboard_brightness_control_delegate.h"
#include "ash/system/status_area_widget.h"
#include "ash/system/tray/system_tray.h"
#include "ash/system/tray/system_tray_delegate.h"
#include "ash/system/tray/system_tray_notifier.h"
#include "ash/system/web_notification/web_notification_tray.h"
#include "ash/touch/touch_hud_debug.h"
#include "ash/volume_control_delegate.h"
#include "ash/wm/mru_window_tracker.h"
#include "ash/wm/overview/window_selector_controller.h"
#include "ash/wm/partial_screenshot_view.h"
#include "ash/wm/power_button_controller.h"
#include "ash/wm/window_state.h"
#include "ash/wm/window_util.h"
#include "ash/wm/wm_event.h"
#include "base/bind.h"
#include "base/command_line.h"
#include "base/metrics/user_metrics.h"
#include "ui/aura/env.h"
#include "ui/aura/window_event_dispatcher.h"
#include "ui/base/accelerators/accelerator.h"
#include "ui/base/accelerators/accelerator_manager.h"
#include "ui/compositor/debug_utils.h"
#include "ui/compositor/layer.h"
#include "ui/compositor/layer_animation_sequence.h"
#include "ui/compositor/layer_animator.h"
#include "ui/events/event.h"
#include "ui/events/keycodes/keyboard_codes.h"
#include "ui/gfx/screen.h"
#include "ui/views/controls/webview/webview.h"
#include "ui/views/debug_utils.h"
#include "ui/views/widget/widget.h"

#if defined(OS_CHROMEOS)
#include "ash/session_state_delegate.h"
#include "ash/system/chromeos/keyboard_brightness_controller.h"
#include "base/sys_info.h"
#include "chromeos/ime/input_method_manager.h"
#include "chromeos/ime/xkeyboard.h"
#endif  // defined(OS_CHROMEOS)

namespace ash {
namespace {

using base::UserMetricsAction;

bool DebugShortcutsEnabled() {
#if defined(NDEBUG)
  return CommandLine::ForCurrentProcess()->HasSwitch(
          switches::kAshDebugShortcuts);
#else
  return true;
#endif
}

bool HandleAccessibleFocusCycle(bool reverse) {
  if (reverse) {
    base::RecordAction(UserMetricsAction("Accel_Accessible_Focus_Previous"));
  } else {
    base::RecordAction(UserMetricsAction("Accel_Accessible_Focus_Next"));
  }

  if (!Shell::GetInstance()->accessibility_delegate()->
      IsSpokenFeedbackEnabled()) {
    return false;
  }
  aura::Window* active_window = ash::wm::GetActiveWindow();
  if (!active_window)
    return false;
  views::Widget* widget =
      views::Widget::GetWidgetForNativeWindow(active_window);
  if (!widget)
    return false;
  views::FocusManager* focus_manager = widget->GetFocusManager();
  if (!focus_manager)
    return false;
  views::View* view = focus_manager->GetFocusedView();
  if (!view)
    return false;
  if (!strcmp(view->GetClassName(), views::WebView::kViewClassName))
    return false;

  focus_manager->AdvanceFocus(reverse);
  return true;
}

bool HandleCycleBackwardMRU(const ui::Accelerator& accelerator) {
  if (accelerator.key_code() == ui::VKEY_TAB)
    base::RecordAction(base::UserMetricsAction("Accel_PrevWindow_Tab"));

  Shell::GetInstance()->window_selector_controller()->HandleCycleWindow(
      WindowSelector::BACKWARD);
  return true;
}

bool HandleCycleForwardMRU(const ui::Accelerator& accelerator) {
  if (accelerator.key_code() == ui::VKEY_TAB)
    base::RecordAction(base::UserMetricsAction("Accel_NextWindow_Tab"));

  Shell::GetInstance()->window_selector_controller()->HandleCycleWindow(
      WindowSelector::FORWARD);
  return true;
}

bool ToggleOverview(const ui::Accelerator& accelerator) {
  base::RecordAction(base::UserMetricsAction("Accel_Overview_F5"));
  Shell::GetInstance()->window_selector_controller()->ToggleOverview();
  return true;
}

bool HandleFocusLauncher() {
  Shell* shell = Shell::GetInstance();
  base::RecordAction(base::UserMetricsAction("Accel_Focus_Launcher"));
  return shell->focus_cycler()->FocusWidget(
      Shelf::ForPrimaryDisplay()->shelf_widget());
}

bool HandleLaunchAppN(int n) {
  base::RecordAction(UserMetricsAction("Accel_Launch_App"));
  Shelf::ForPrimaryDisplay()->LaunchAppIndexAt(n);
  return true;
}

bool HandleLaunchLastApp() {
  base::RecordAction(UserMetricsAction("Accel_Launch_Last_App"));
  Shelf::ForPrimaryDisplay()->LaunchAppIndexAt(-1);
  return true;
}

// Magnify the screen
bool HandleMagnifyScreen(int delta_index) {
  if (ash::Shell::GetInstance()->magnification_controller()->IsEnabled()) {
    // TODO(yoshiki): Move the following logic to MagnificationController.
    float scale =
        ash::Shell::GetInstance()->magnification_controller()->GetScale();
    // Calculate rounded logarithm (base kMagnificationScaleFactor) of scale.
    int scale_index =
        std::floor(std::log(scale) / std::log(kMagnificationScaleFactor) + 0.5);

    int new_scale_index = std::max(0, std::min(8, scale_index + delta_index));

    ash::Shell::GetInstance()->magnification_controller()->
        SetScale(std::pow(kMagnificationScaleFactor, new_scale_index), true);
  } else if (ash::Shell::GetInstance()->
             partial_magnification_controller()->is_enabled()) {
    float scale = delta_index > 0 ? kDefaultPartialMagnifiedScale : 1;
    ash::Shell::GetInstance()->partial_magnification_controller()->
        SetScale(scale);
  }

  return true;
}

bool HandleMediaNextTrack() {
  Shell::GetInstance()->media_delegate()->HandleMediaNextTrack();
  return true;
}

bool HandleMediaPlayPause() {
  Shell::GetInstance()->media_delegate()->HandleMediaPlayPause();
  return true;
}

bool HandleMediaPrevTrack() {
  Shell::GetInstance()->media_delegate()->HandleMediaPrevTrack();
  return true;
}

bool HandleNewIncognitoWindow() {
  base::RecordAction(UserMetricsAction("Accel_New_Incognito_Window"));
  bool incognito_allowed =
    Shell::GetInstance()->delegate()->IsIncognitoAllowed();
  if (incognito_allowed)
    Shell::GetInstance()->new_window_delegate()->NewWindow(
        true /* is_incognito */);
  return incognito_allowed;
}

bool HandleNewTab(ui::KeyboardCode key_code) {
  if (key_code == ui::VKEY_T)
    base::RecordAction(base::UserMetricsAction("Accel_NewTab_T"));
  Shell::GetInstance()->new_window_delegate()->NewTab();
  return true;
}

bool HandleNewWindow() {
  base::RecordAction(base::UserMetricsAction("Accel_New_Window"));
  Shell::GetInstance()->new_window_delegate()->NewWindow(
      false /* is_incognito */);
  return true;
}

bool HandleNextIme(ImeControlDelegate* ime_control_delegate,
                   ui::EventType previous_event_type,
                   ui::KeyboardCode previous_key_code) {
  // This check is necessary e.g. not to process the Shift+Alt+
  // ET_KEY_RELEASED accelerator for Chrome OS (see ash/accelerators/
  // accelerator_controller.cc) when Shift+Alt+Tab is pressed and then Tab
  // is released.
  if (previous_event_type == ui::ET_KEY_RELEASED &&
      // Workaround for crbug.com/139556. CJK IME users tend to press
      // Enter (or Space) and Shift+Alt almost at the same time to commit
      // an IME string and then switch from the IME to the English layout.
      // This workaround allows the user to trigger NEXT_IME even if the
      // user presses Shift+Alt before releasing Enter.
      // TODO(nona|mazda): Fix crbug.com/139556 in a cleaner way.
      previous_key_code != ui::VKEY_RETURN &&
      previous_key_code != ui::VKEY_SPACE) {
    // We totally ignore this accelerator.
    // TODO(mazda): Fix crbug.com/158217
    return false;
  }
  base::RecordAction(UserMetricsAction("Accel_Next_Ime"));
  if (ime_control_delegate)
    return ime_control_delegate->HandleNextIme();
  return false;
}

bool HandleOpenFeedbackPage() {
  base::RecordAction(UserMetricsAction("Accel_Open_Feedback_Page"));
  ash::Shell::GetInstance()->new_window_delegate()->OpenFeedbackPage();
  return true;
}

bool HandlePositionCenter() {
  base::RecordAction(UserMetricsAction("Accel_Window_Position_Center"));
  aura::Window* window = wm::GetActiveWindow();
  // Docked windows do not support centering and ignore accelerator.
  if (window && !wm::GetWindowState(window)->IsDocked()) {
    wm::CenterWindow(window);
    return true;
  }
  return false;
}

bool HandlePreviousIme(ImeControlDelegate* ime_control_delegate,
                       const ui::Accelerator& accelerator) {
  base::RecordAction(UserMetricsAction("Accel_Previous_Ime"));
  if (ime_control_delegate)
    return ime_control_delegate->HandlePreviousIme(accelerator);
  return false;
}

bool HandleRestoreTab() {
  base::RecordAction(base::UserMetricsAction("Accel_Restore_Tab"));
  Shell::GetInstance()->new_window_delegate()->RestoreTab();
  return true;
}

bool HandleRotatePaneFocus(Shell::Direction direction) {
  Shell* shell = Shell::GetInstance();
  switch (direction) {
    // TODO(stevet): Not sure if this is the same as IDC_FOCUS_NEXT_PANE.
    case Shell::FORWARD: {
      base::RecordAction(UserMetricsAction("Accel_Focus_Next_Pane"));
      shell->focus_cycler()->RotateFocus(FocusCycler::FORWARD);
      break;
    }
    case Shell::BACKWARD: {
      base::RecordAction(UserMetricsAction("Accel_Focus_Previous_Pane"));
      shell->focus_cycler()->RotateFocus(FocusCycler::BACKWARD);
      break;
    }
  }
  return true;
}

// Rotate the active window.
bool HandleRotateActiveWindow() {
  base::RecordAction(UserMetricsAction("Accel_Rotate_Window"));
  aura::Window* active_window = wm::GetActiveWindow();
  if (active_window) {
    // The rotation animation bases its target transform on the current
    // rotation and position. Since there could be an animation in progress
    // right now, queue this animation so when it starts it picks up a neutral
    // rotation and position. Use replace so we only enqueue one at a time.
    active_window->layer()->GetAnimator()->
        set_preemption_strategy(ui::LayerAnimator::REPLACE_QUEUED_ANIMATIONS);
    active_window->layer()->GetAnimator()->StartAnimation(
        new ui::LayerAnimationSequence(
            new ash::ScreenRotation(360, active_window->layer())));
  }
  return true;
}

gfx::Display::Rotation GetNextRotation(gfx::Display::Rotation current) {
  switch (current) {
    case gfx::Display::ROTATE_0:
      return gfx::Display::ROTATE_90;
    case gfx::Display::ROTATE_90:
      return gfx::Display::ROTATE_180;
    case gfx::Display::ROTATE_180:
      return gfx::Display::ROTATE_270;
    case gfx::Display::ROTATE_270:
      return gfx::Display::ROTATE_0;
  }
  NOTREACHED() << "Unknown rotation:" << current;
  return gfx::Display::ROTATE_0;
}

// Rotates the screen.
bool HandleRotateScreen() {
  base::RecordAction(UserMetricsAction("Accel_Rotate_Window"));
  gfx::Point point = Shell::GetScreen()->GetCursorScreenPoint();
  gfx::Display display = Shell::GetScreen()->GetDisplayNearestPoint(point);
  const DisplayInfo& display_info =
      Shell::GetInstance()->display_manager()->GetDisplayInfo(display.id());
  Shell::GetInstance()->display_manager()->SetDisplayRotation(
      display.id(), GetNextRotation(display_info.rotation()));
  return true;
}

bool HandleScaleReset() {
  DisplayManager* display_manager = Shell::GetInstance()->display_manager();
  int64 display_id = display_manager->GetDisplayIdForUIScaling();
  if (display_id == gfx::Display::kInvalidDisplayID)
    return false;

  base::RecordAction(UserMetricsAction("Accel_Scale_Ui_Reset"));

  display_manager->SetDisplayUIScale(display_id, 1.0f);
  return true;
}

bool HandleScaleUI(bool up) {
  DisplayManager* display_manager = Shell::GetInstance()->display_manager();
  int64 display_id = display_manager->GetDisplayIdForUIScaling();
  if (display_id == gfx::Display::kInvalidDisplayID)
    return false;

  if (up) {
    base::RecordAction(UserMetricsAction("Accel_Scale_Ui_Up"));
  } else {
    base::RecordAction(UserMetricsAction("Accel_Scale_Ui_Down"));
  }

  const DisplayInfo& display_info = display_manager->GetDisplayInfo(display_id);
  float next_scale = DisplayManager::GetNextUIScale(display_info, up);
  display_manager->SetDisplayUIScale(display_id, next_scale);
  return true;
}

#if defined(OS_CHROMEOS)
bool HandleSwapPrimaryDisplay() {
  base::RecordAction(UserMetricsAction("Accel_Swap_Primary_Display"));
  Shell::GetInstance()->display_controller()->SwapPrimaryDisplay();
  return true;
}
#endif

bool HandleShowKeyboardOverlay() {
  base::RecordAction(UserMetricsAction("Accel_Show_Keyboard_Overlay"));
  ash::Shell::GetInstance()->new_window_delegate()->ShowKeyboardOverlay();

  return true;
}

void HandleShowMessageCenterBubble() {
  base::RecordAction(UserMetricsAction("Accel_Show_Message_Center_Bubble"));
  RootWindowController* controller =
      RootWindowController::ForTargetRootWindow();
  StatusAreaWidget* status_area_widget =
      controller->shelf()->status_area_widget();
  if (status_area_widget) {
    WebNotificationTray* notification_tray =
      status_area_widget->web_notification_tray();
    if (notification_tray->visible())
      notification_tray->ShowMessageCenterBubble();
  }
}

bool HandleShowSystemTrayBubble() {
  base::RecordAction(UserMetricsAction("Accel_Show_System_Tray_Bubble"));
  RootWindowController* controller =
      RootWindowController::ForTargetRootWindow();
  if (!controller->GetSystemTray()->HasSystemBubble()) {
    controller->GetSystemTray()->ShowDefaultView(BUBBLE_CREATE_NEW);
    return true;
  }
  return false;
}

bool HandleShowTaskManager() {
  base::RecordAction(UserMetricsAction("Accel_Show_Task_Manager"));
  Shell::GetInstance()->new_window_delegate()->ShowTaskManager();
  return true;
}

#if defined(OS_CHROMEOS)
void HandleSilenceSpokenFeedback() {
  base::RecordAction(UserMetricsAction("Accel_Silence_Spoken_Feedback"));

  AccessibilityDelegate* delegate =
      Shell::GetInstance()->accessibility_delegate();
  if (!delegate->IsSpokenFeedbackEnabled())
    return;
  delegate->SilenceSpokenFeedback();
}
#endif

bool HandleSwitchIme(ImeControlDelegate* ime_control_delegate,
                     const ui::Accelerator& accelerator) {
  base::RecordAction(UserMetricsAction("Accel_Switch_Ime"));
  if (ime_control_delegate)
    return ime_control_delegate->HandleSwitchIme(accelerator);
  return false;
}

bool HandleTakePartialScreenshot(ScreenshotDelegate* screenshot_delegate) {
  base::RecordAction(UserMetricsAction("Accel_Take_Partial_Screenshot"));
  if (screenshot_delegate) {
    ash::PartialScreenshotView::StartPartialScreenshot(
        screenshot_delegate);
  }
  // Return true to prevent propagation of the key event because
  // this key combination is reserved for partial screenshot.
  return true;
}

bool HandleTakeScreenshot(ScreenshotDelegate* screenshot_delegate) {
  base::RecordAction(UserMetricsAction("Accel_Take_Screenshot"));
  if (screenshot_delegate &&
      screenshot_delegate->CanTakeScreenshot()) {
    screenshot_delegate->HandleTakeScreenshotForAllRootWindows();
  }
  // Return true to prevent propagation of the key event.
  return true;
}

bool HandleToggleAppList(ui::KeyboardCode key_code,
                         ui::EventType previous_event_type,
                         ui::KeyboardCode previous_key_code,
                         const ui::Accelerator& accelerator) {
  // If something else was pressed between the Search key (LWIN)
  // being pressed and released, then ignore the release of the
  // Search key.
  if (key_code == ui::VKEY_LWIN &&
      (previous_event_type == ui::ET_KEY_RELEASED ||
       previous_key_code != ui::VKEY_LWIN))
    return false;
  if (key_code == ui::VKEY_LWIN)
    base::RecordAction(base::UserMetricsAction("Accel_Search_LWin"));
  // When spoken feedback is enabled, we should neither toggle the list nor
  // consume the key since Search+Shift is one of the shortcuts the a11y
  // feature uses. crbug.com/132296
  DCHECK_EQ(ui::VKEY_LWIN, accelerator.key_code());
  if (Shell::GetInstance()->accessibility_delegate()->
      IsSpokenFeedbackEnabled())
    return false;
  ash::Shell::GetInstance()->ToggleAppList(NULL);
  return true;
}

bool HandleToggleFullscreen(ui::KeyboardCode key_code) {
  if (key_code == ui::VKEY_MEDIA_LAUNCH_APP2) {
    base::RecordAction(UserMetricsAction("Accel_Fullscreen_F4"));
  }
  accelerators::ToggleFullscreen();
  return true;
}

bool HandleToggleRootWindowFullScreen() {
  Shell::GetPrimaryRootWindow()->GetHost()->ToggleFullScreen();
  return true;
}

bool HandleWindowSnap(int action) {
  wm::WindowState* window_state = wm::GetActiveWindowState();
  // Disable window snapping shortcut key for full screen window due to
  // http://crbug.com/135487.
  if (!window_state ||
      window_state->window()->type() != ui::wm::WINDOW_TYPE_NORMAL ||
      window_state->IsFullscreen()) {
    return false;
  }

  if (action == WINDOW_SNAP_LEFT) {
    base::RecordAction(UserMetricsAction("Accel_Window_Snap_Left"));
  } else {
    base::RecordAction(UserMetricsAction("Accel_Window_Snap_Right"));
  }
  const wm::WMEvent event(action == WINDOW_SNAP_LEFT ?
                          wm::WM_EVENT_SNAP_LEFT : wm::WM_EVENT_SNAP_RIGHT);
  window_state->OnWMEvent(&event);
  return true;
}

bool HandleWindowMinimize() {
  base::RecordAction(
      base::UserMetricsAction("Accel_Toggle_Minimized_Minus"));
  return accelerators::ToggleMinimized();
}

#if defined(OS_CHROMEOS)
bool HandleAddRemoveDisplay() {
  base::RecordAction(UserMetricsAction("Accel_Add_Remove_Display"));
  Shell::GetInstance()->display_manager()->AddRemoveDisplay();
  return true;
}

bool HandleCrosh() {
  base::RecordAction(UserMetricsAction("Accel_Open_Crosh"));

  Shell::GetInstance()->new_window_delegate()->OpenCrosh();
  return true;
}

bool HandleFileManager() {
  base::RecordAction(UserMetricsAction("Accel_Open_File_Manager"));

  Shell::GetInstance()->new_window_delegate()->OpenFileManager();
  return true;
}

bool HandleLock(ui::KeyboardCode key_code) {
  base::RecordAction(UserMetricsAction("Accel_LockScreen_L"));
  Shell::GetInstance()->session_state_delegate()->LockScreen();
  return true;
}

bool HandleCycleUser(SessionStateDelegate::CycleUser cycle_user) {
  if (!Shell::GetInstance()->delegate()->IsMultiProfilesEnabled())
    return false;
  ash::SessionStateDelegate* delegate =
      ash::Shell::GetInstance()->session_state_delegate();
  if (delegate->NumberOfLoggedInUsers() <= 1)
    return false;
  MultiProfileUMA::RecordSwitchActiveUser(
      MultiProfileUMA::SWITCH_ACTIVE_USER_BY_ACCELERATOR);
  switch (cycle_user) {
    case SessionStateDelegate::CYCLE_TO_NEXT_USER:
      base::RecordAction(UserMetricsAction("Accel_Switch_To_Next_User"));
      break;
    case SessionStateDelegate::CYCLE_TO_PREVIOUS_USER:
      base::RecordAction(UserMetricsAction("Accel_Switch_To_Previous_User"));
      break;
  }
  delegate->CycleActiveUser(cycle_user);
  return true;
}

bool HandleToggleMirrorMode() {
  base::RecordAction(UserMetricsAction("Accel_Toggle_Mirror_Mode"));
  Shell::GetInstance()->display_controller()->ToggleMirrorMode();
  return true;
}

bool HandleToggleSpokenFeedback() {
  base::RecordAction(UserMetricsAction("Accel_Toggle_Spoken_Feedback"));

  Shell::GetInstance()->accessibility_delegate()->
      ToggleSpokenFeedback(A11Y_NOTIFICATION_SHOW);
  return true;
}

bool HandleToggleTouchViewTesting() {
  // TODO(skuhne): This is only temporary! Remove this!
  if (CommandLine::ForCurrentProcess()->HasSwitch(
          switches::kAshEnableTouchViewTesting)) {
    Shell* shell = Shell::GetInstance();
    shell->EnableMaximizeModeWindowManager(
        !shell->IsMaximizeModeWindowManagerEnabled());
    return true;
  }
  return false;
}

bool HandleTouchHudClear() {
  RootWindowController* controller =
      RootWindowController::ForTargetRootWindow();
  if (controller->touch_hud_debug()) {
    controller->touch_hud_debug()->Clear();
    return true;
  }
  return false;
}

bool HandleTouchHudModeChange() {
  RootWindowController* controller =
      RootWindowController::ForTargetRootWindow();
  if (controller->touch_hud_debug()) {
    controller->touch_hud_debug()->ChangeToNextMode();
    return true;
  }
  return false;
}

bool HandleTouchHudProjectToggle() {
  base::RecordAction(UserMetricsAction("Accel_Touch_Hud_Clear"));
  bool enabled = Shell::GetInstance()->is_touch_hud_projection_enabled();
  Shell::GetInstance()->SetTouchHudProjectionEnabled(!enabled);
  return true;
}

bool HandleDisableCapsLock(ui::KeyboardCode key_code,
                           ui::EventType previous_event_type,
                           ui::KeyboardCode previous_key_code) {
  if (previous_event_type == ui::ET_KEY_RELEASED ||
      (previous_key_code != ui::VKEY_LSHIFT &&
       previous_key_code != ui::VKEY_SHIFT &&
       previous_key_code != ui::VKEY_RSHIFT)) {
    // If something else was pressed between the Shift key being pressed
    // and released, then ignore the release of the Shift key.
    return false;
  }
  base::RecordAction(UserMetricsAction("Accel_Disable_Caps_Lock"));
  chromeos::input_method::InputMethodManager* ime =
      chromeos::input_method::InputMethodManager::Get();
  chromeos::input_method::XKeyboard* xkeyboard =
      ime ? ime->GetXKeyboard() : NULL;
  if (xkeyboard && xkeyboard->CapsLockIsEnabled()) {
    xkeyboard->SetCapsLockEnabled(false);
    return true;
  }
  return false;
}

bool HandleToggleCapsLock(ui::KeyboardCode key_code,
                          ui::EventType previous_event_type,
                          ui::KeyboardCode previous_key_code) {
  if (key_code == ui::VKEY_LWIN) {
    // If something else was pressed between the Search key (LWIN)
    // being pressed and released, then ignore the release of the
    // Search key.
    // TODO(danakj): Releasing Alt first breaks this: crbug.com/166495
    if (previous_event_type == ui::ET_KEY_RELEASED ||
        previous_key_code != ui::VKEY_LWIN)
      return false;
  }
  base::RecordAction(UserMetricsAction("Accel_Toggle_Caps_Lock"));
  chromeos::input_method::InputMethodManager* ime =
      chromeos::input_method::InputMethodManager::Get();
  chromeos::input_method::XKeyboard* xkeyboard =
      ime ? ime->GetXKeyboard() : NULL;
  if (xkeyboard)
    xkeyboard->SetCapsLockEnabled(!xkeyboard->CapsLockIsEnabled());
  return true;
}

#endif  // defined(OS_CHROMEOS)

// Debug print methods.

bool HandlePrintLayerHierarchy() {
  aura::Window::Windows root_windows = Shell::GetAllRootWindows();
  for (size_t i = 0; i < root_windows.size(); ++i) {
    ui::PrintLayerHierarchy(
        root_windows[i]->layer(),
        root_windows[i]->GetHost()->dispatcher()->GetLastMouseLocationInRoot());
  }
  return true;
}

bool HandlePrintViewHierarchy() {
  aura::Window* active_window = ash::wm::GetActiveWindow();
  if (!active_window)
    return true;
  views::Widget* browser_widget =
      views::Widget::GetWidgetForNativeWindow(active_window);
  if (!browser_widget)
    return true;
  views::PrintViewHierarchy(browser_widget->GetRootView());
  return true;
}

void PrintWindowHierarchy(aura::Window* window,
                          int indent,
                          std::ostringstream* out) {
  std::string indent_str(indent, ' ');
  std::string name(window->name());
  if (name.empty())
    name = "\"\"";
  *out << indent_str << name << " (" << window << ")"
       << " type=" << window->type()
       << (wm::IsActiveWindow(window) ? " [active] " : " ")
       << (window->IsVisible() ? " visible " : " ")
       << window->bounds().ToString()
       << '\n';

  for (size_t i = 0; i < window->children().size(); ++i)
    PrintWindowHierarchy(window->children()[i], indent + 3, out);
}

bool HandlePrintWindowHierarchy() {
  Shell::RootWindowControllerList controllers =
      Shell::GetAllRootWindowControllers();
  for (size_t i = 0; i < controllers.size(); ++i) {
    std::ostringstream out;
    out << "RootWindow " << i << ":\n";
    PrintWindowHierarchy(controllers[i]->root_window(), 0, &out);
    // Error so logs can be collected from end-users.
    LOG(ERROR) << out.str();
  }
  return true;
}

bool HandlePrintUIHierarchies() {
  // This is a separate command so the user only has to hit one key to generate
  // all the logs. Developers use the individual dumps repeatedly, so keep
  // those as separate commands to avoid spamming their logs.
  HandlePrintLayerHierarchy();
  HandlePrintWindowHierarchy();
  HandlePrintViewHierarchy();
  return true;
}

}  // namespace

////////////////////////////////////////////////////////////////////////////////
// AcceleratorControllerContext, public:

AcceleratorControllerContext::AcceleratorControllerContext() {
  current_accelerator_.set_type(ui::ET_UNKNOWN);
  previous_accelerator_.set_type(ui::ET_UNKNOWN);
}

void AcceleratorControllerContext::UpdateContext(
    const ui::Accelerator& accelerator) {
  previous_accelerator_ = current_accelerator_;
  current_accelerator_ = accelerator;
}

////////////////////////////////////////////////////////////////////////////////
// AcceleratorController, public:

AcceleratorController::AcceleratorController()
    : accelerator_manager_(new ui::AcceleratorManager) {
  Init();
}

AcceleratorController::~AcceleratorController() {
}

void AcceleratorController::Init() {
  for (size_t i = 0; i < kActionsAllowedAtLoginOrLockScreenLength; ++i) {
    actions_allowed_at_login_screen_.insert(
        kActionsAllowedAtLoginOrLockScreen[i]);
    actions_allowed_at_lock_screen_.insert(
        kActionsAllowedAtLoginOrLockScreen[i]);
  }
  for (size_t i = 0; i < kActionsAllowedAtLockScreenLength; ++i)
    actions_allowed_at_lock_screen_.insert(kActionsAllowedAtLockScreen[i]);
  for (size_t i = 0; i < kActionsAllowedAtModalWindowLength; ++i)
    actions_allowed_at_modal_window_.insert(kActionsAllowedAtModalWindow[i]);
  for (size_t i = 0; i < kReservedActionsLength; ++i)
    reserved_actions_.insert(kReservedActions[i]);
  for (size_t i = 0; i < kNonrepeatableActionsLength; ++i)
    nonrepeatable_actions_.insert(kNonrepeatableActions[i]);
  for (size_t i = 0; i < kActionsAllowedInAppModeLength; ++i)
    actions_allowed_in_app_mode_.insert(kActionsAllowedInAppMode[i]);
  for (size_t i = 0; i < kActionsNeedingWindowLength; ++i)
    actions_needing_window_.insert(kActionsNeedingWindow[i]);

  RegisterAccelerators(kAcceleratorData, kAcceleratorDataLength);

#if !defined(NDEBUG)
  RegisterAccelerators(kDesktopAcceleratorData, kDesktopAcceleratorDataLength);
#endif

  if (DebugShortcutsEnabled()) {
    RegisterAccelerators(kDebugAcceleratorData, kDebugAcceleratorDataLength);
    for (size_t i = 0; i < kReservedDebugActionsLength; ++i)
      reserved_actions_.insert(kReservedDebugActions[i]);
  }

#if defined(OS_CHROMEOS)
  keyboard_brightness_control_delegate_.reset(
      new KeyboardBrightnessController());
#endif
}

void AcceleratorController::Register(const ui::Accelerator& accelerator,
                                     ui::AcceleratorTarget* target) {
  accelerator_manager_->Register(accelerator,
                                 ui::AcceleratorManager::kNormalPriority,
                                 target);
}

void AcceleratorController::Unregister(const ui::Accelerator& accelerator,
                                       ui::AcceleratorTarget* target) {
  accelerator_manager_->Unregister(accelerator, target);
}

void AcceleratorController::UnregisterAll(ui::AcceleratorTarget* target) {
  accelerator_manager_->UnregisterAll(target);
}

bool AcceleratorController::Process(const ui::Accelerator& accelerator) {
  if (ime_control_delegate_) {
    return accelerator_manager_->Process(
        ime_control_delegate_->RemapAccelerator(accelerator));
  }
  return accelerator_manager_->Process(accelerator);
}

bool AcceleratorController::IsRegistered(
    const ui::Accelerator& accelerator) const {
  return accelerator_manager_->GetCurrentTarget(accelerator) != NULL;
}

bool AcceleratorController::IsReservedAccelerator(
    const ui::Accelerator& accelerator) const {
  const ui::Accelerator remapped_accelerator = ime_control_delegate_.get() ?
      ime_control_delegate_->RemapAccelerator(accelerator) : accelerator;

  std::map<ui::Accelerator, int>::const_iterator iter =
      accelerators_.find(remapped_accelerator);
  if (iter == accelerators_.end())
    return false;  // not an accelerator.

  return reserved_actions_.find(iter->second) != reserved_actions_.end();
}

bool AcceleratorController::PerformAction(int action,
                                          const ui::Accelerator& accelerator) {
  ash::Shell* shell = ash::Shell::GetInstance();
  if (!shell->session_state_delegate()->IsActiveUserSessionStarted() &&
      actions_allowed_at_login_screen_.find(action) ==
      actions_allowed_at_login_screen_.end()) {
    return false;
  }
  if (shell->session_state_delegate()->IsScreenLocked() &&
      actions_allowed_at_lock_screen_.find(action) ==
      actions_allowed_at_lock_screen_.end()) {
    return false;
  }
  if (shell->IsSystemModalWindowOpen() &&
      actions_allowed_at_modal_window_.find(action) ==
      actions_allowed_at_modal_window_.end()) {
    // Note: we return true. This indicates the shortcut is handled
    // and will not be passed to the modal window. This is important
    // for things like Alt+Tab that would cause an undesired effect
    // in the modal window by cycling through its window elements.
    return true;
  }
  if (shell->delegate()->IsRunningInForcedAppMode() &&
      actions_allowed_in_app_mode_.find(action) ==
      actions_allowed_in_app_mode_.end()) {
    return false;
  }
  if (MruWindowTracker::BuildWindowList(false).empty() &&
      actions_needing_window_.find(action) != actions_needing_window_.end()) {
    Shell::GetInstance()->accessibility_delegate()->TriggerAccessibilityAlert(
        A11Y_ALERT_WINDOW_NEEDED);
    return true;
  }

  const ui::KeyboardCode key_code = accelerator.key_code();
  // PerformAction() is performed from gesture controllers and passes
  // empty Accelerator() instance as the second argument. Such events
  // should never be suspended.
  const bool gesture_event = key_code == ui::VKEY_UNKNOWN;

  // Ignore accelerators invoked as repeated (while holding a key for a long
  // time, if their handling is nonrepeatable.
  if (nonrepeatable_actions_.find(action) != nonrepeatable_actions_.end() &&
      context_.repeated() && !gesture_event) {
    return true;
  }
  // Type of the previous accelerator. Used by NEXT_IME and DISABLE_CAPS_LOCK.
  const ui::EventType previous_event_type =
    context_.previous_accelerator().type();
  const ui::KeyboardCode previous_key_code =
    context_.previous_accelerator().key_code();

  // You *MUST* return true when some action is performed. Otherwise, this
  // function might be called *twice*, via BrowserView::PreHandleKeyboardEvent
  // and BrowserView::HandleKeyboardEvent, for a single accelerator press.
  //
  // If your accelerator invokes more than one line of code, please either
  // implement it in your module's controller code (like TOGGLE_MIRROR_MODE
  // below) or pull it into a HandleFoo() function above.
  switch (action) {
    case ACCESSIBLE_FOCUS_NEXT:
      return HandleAccessibleFocusCycle(false);
    case ACCESSIBLE_FOCUS_PREVIOUS:
      return HandleAccessibleFocusCycle(true);
    case CYCLE_BACKWARD_MRU:
      return HandleCycleBackwardMRU(accelerator);
    case CYCLE_FORWARD_MRU:
      return HandleCycleForwardMRU(accelerator);
    case TOGGLE_OVERVIEW:
      return ToggleOverview(accelerator);
#if defined(OS_CHROMEOS)
    case ADD_REMOVE_DISPLAY:
      return HandleAddRemoveDisplay();
    case TOGGLE_MIRROR_MODE:
      return HandleToggleMirrorMode();
    case LOCK_SCREEN:
      return HandleLock(key_code);
    case OPEN_FILE_MANAGER:
      return HandleFileManager();
    case OPEN_CROSH:
      return HandleCrosh();
    case SILENCE_SPOKEN_FEEDBACK:
      HandleSilenceSpokenFeedback();
      break;
    case SWAP_PRIMARY_DISPLAY:
      return HandleSwapPrimaryDisplay();
    case SWITCH_TO_NEXT_USER:
      return HandleCycleUser(SessionStateDelegate::CYCLE_TO_NEXT_USER);
    case SWITCH_TO_PREVIOUS_USER:
      return HandleCycleUser(SessionStateDelegate::CYCLE_TO_PREVIOUS_USER);
    case TOGGLE_SPOKEN_FEEDBACK:
      return HandleToggleSpokenFeedback();
    case TOGGLE_TOUCH_VIEW_TESTING:
      return HandleToggleTouchViewTesting();
    case TOGGLE_WIFI:
      Shell::GetInstance()->system_tray_notifier()->NotifyRequestToggleWifi();
      return true;
    case TOUCH_HUD_CLEAR:
      return HandleTouchHudClear();
    case TOUCH_HUD_MODE_CHANGE:
      return HandleTouchHudModeChange();
    case TOUCH_HUD_PROJECTION_TOGGLE:
      return HandleTouchHudProjectToggle();
    case DISABLE_GPU_WATCHDOG:
      Shell::GetInstance()->gpu_support()->DisableGpuWatchdog();
      return true;
    case DISABLE_CAPS_LOCK:
      return HandleDisableCapsLock(
          key_code, previous_event_type, previous_key_code);
    case TOGGLE_CAPS_LOCK:
      return HandleToggleCapsLock(
          key_code, previous_event_type, previous_key_code);
#endif  // OS_CHROMEOS
    case OPEN_FEEDBACK_PAGE:
      return HandleOpenFeedbackPage();
    case EXIT:
      // UMA metrics are recorded in the handler.
      exit_warning_handler_.HandleAccelerator();
      return true;
    case NEW_INCOGNITO_WINDOW:
      return HandleNewIncognitoWindow();
    case NEW_TAB:
      return HandleNewTab(key_code);
    case NEW_WINDOW:
      return HandleNewWindow();
    case RESTORE_TAB:
      return HandleRestoreTab();
    case TAKE_SCREENSHOT:
      return HandleTakeScreenshot(screenshot_delegate_.get());
    case TAKE_PARTIAL_SCREENSHOT:
      return HandleTakePartialScreenshot(screenshot_delegate_.get());
    case TOGGLE_APP_LIST:
      return HandleToggleAppList(
          key_code, previous_event_type, previous_key_code, accelerator);
    case BRIGHTNESS_DOWN:
      if (brightness_control_delegate_)
        return brightness_control_delegate_->HandleBrightnessDown(accelerator);
      break;
    case BRIGHTNESS_UP:
      if (brightness_control_delegate_)
        return brightness_control_delegate_->HandleBrightnessUp(accelerator);
      break;
    case KEYBOARD_BRIGHTNESS_DOWN:
      if (keyboard_brightness_control_delegate_)
        return keyboard_brightness_control_delegate_->
            HandleKeyboardBrightnessDown(accelerator);
      break;
    case KEYBOARD_BRIGHTNESS_UP:
      if (keyboard_brightness_control_delegate_)
        return keyboard_brightness_control_delegate_->
            HandleKeyboardBrightnessUp(accelerator);
      break;
    case VOLUME_MUTE: {
      ash::VolumeControlDelegate* volume_delegate =
          shell->system_tray_delegate()->GetVolumeControlDelegate();
      return volume_delegate && volume_delegate->HandleVolumeMute(accelerator);
    }
    case VOLUME_DOWN: {
      ash::VolumeControlDelegate* volume_delegate =
          shell->system_tray_delegate()->GetVolumeControlDelegate();
      return volume_delegate && volume_delegate->HandleVolumeDown(accelerator);
    }
    case VOLUME_UP: {
      ash::VolumeControlDelegate* volume_delegate =
          shell->system_tray_delegate()->GetVolumeControlDelegate();
      return volume_delegate && volume_delegate->HandleVolumeUp(accelerator);
    }
    case FOCUS_LAUNCHER:
      return HandleFocusLauncher();
    case FOCUS_NEXT_PANE:
      return HandleRotatePaneFocus(Shell::FORWARD);
    case FOCUS_PREVIOUS_PANE:
      return HandleRotatePaneFocus(Shell::BACKWARD);
    case SHOW_KEYBOARD_OVERLAY:
      return HandleShowKeyboardOverlay();
    case SHOW_SYSTEM_TRAY_BUBBLE:
      return HandleShowSystemTrayBubble();
    case SHOW_MESSAGE_CENTER_BUBBLE:
      HandleShowMessageCenterBubble();
      break;
    case SHOW_TASK_MANAGER:
      return HandleShowTaskManager();
    case NEXT_IME:
      return HandleNextIme(
          ime_control_delegate_.get(), previous_event_type, previous_key_code);
    case PREVIOUS_IME:
      return HandlePreviousIme(ime_control_delegate_.get(), accelerator);
    case PRINT_UI_HIERARCHIES:
      return HandlePrintUIHierarchies();
    case SWITCH_IME:
      return HandleSwitchIme(ime_control_delegate_.get(), accelerator);
    case LAUNCH_APP_0:
      return HandleLaunchAppN(0);
    case LAUNCH_APP_1:
      return HandleLaunchAppN(1);
    case LAUNCH_APP_2:
      return HandleLaunchAppN(2);
    case LAUNCH_APP_3:
      return HandleLaunchAppN(3);
    case LAUNCH_APP_4:
      return HandleLaunchAppN(4);
    case LAUNCH_APP_5:
      return HandleLaunchAppN(5);
    case LAUNCH_APP_6:
      return HandleLaunchAppN(6);
    case LAUNCH_APP_7:
      return HandleLaunchAppN(7);
    case LAUNCH_LAST_APP:
      return HandleLaunchLastApp();
    case WINDOW_SNAP_LEFT:
    case WINDOW_SNAP_RIGHT:
      return HandleWindowSnap(action);
    case WINDOW_MINIMIZE:
      return HandleWindowMinimize();
    case TOGGLE_FULLSCREEN:
      return HandleToggleFullscreen(key_code);
    case TOGGLE_MAXIMIZED:
      accelerators::ToggleMaximized();
      return true;
    case WINDOW_POSITION_CENTER:
     return HandlePositionCenter();
    case SCALE_UI_UP:
      return HandleScaleUI(true /* up */);
    case SCALE_UI_DOWN:
      return HandleScaleUI(false /* down */);
    case SCALE_UI_RESET:
      return HandleScaleReset();
    case ROTATE_WINDOW:
      return HandleRotateActiveWindow();
    case ROTATE_SCREEN:
      return HandleRotateScreen();
    case TOGGLE_DESKTOP_BACKGROUND_MODE:
      return debug::CycleDesktopBackgroundMode();
    case TOGGLE_ROOT_WINDOW_FULL_SCREEN:
      return HandleToggleRootWindowFullScreen();
    case DEBUG_TOGGLE_DEVICE_SCALE_FACTOR:
      Shell::GetInstance()->display_manager()->ToggleDisplayScaleFactor();
      return true;
    case DEBUG_TOGGLE_SHOW_DEBUG_BORDERS:
      ash::debug::ToggleShowDebugBorders();
      return true;
    case DEBUG_TOGGLE_SHOW_FPS_COUNTER:
      ash::debug::ToggleShowFpsCounter();
      return true;
    case DEBUG_TOGGLE_SHOW_PAINT_RECTS:
      ash::debug::ToggleShowPaintRects();
      return true;
    case MAGNIFY_SCREEN_ZOOM_IN:
      return HandleMagnifyScreen(1);
    case MAGNIFY_SCREEN_ZOOM_OUT:
      return HandleMagnifyScreen(-1);
    case MEDIA_NEXT_TRACK:
      return HandleMediaNextTrack();
    case MEDIA_PLAY_PAUSE:
       return HandleMediaPlayPause();
    case MEDIA_PREV_TRACK:
       return HandleMediaPrevTrack();
    case POWER_PRESSED:  // fallthrough
    case POWER_RELEASED:
#if defined(OS_CHROMEOS)
      if (!base::SysInfo::IsRunningOnChromeOS()) {
        // There is no powerd in linux desktop, so call the
        // PowerButtonController here.
        Shell::GetInstance()->power_button_controller()->
            OnPowerButtonEvent(action == POWER_PRESSED, base::TimeTicks());
      }
#endif
      // We don't do anything with these at present on the device,
      // (power button events are reported to us from powerm via
      // D-BUS), but we consume them to prevent them from getting
      // passed to apps -- see http://crbug.com/146609.
      return true;
    case LOCK_PRESSED:
    case LOCK_RELEASED:
      Shell::GetInstance()->power_button_controller()->
          OnLockButtonEvent(action == LOCK_PRESSED, base::TimeTicks());
      return true;
    case PRINT_LAYER_HIERARCHY:
      return HandlePrintLayerHierarchy();
    case PRINT_VIEW_HIERARCHY:
      return HandlePrintViewHierarchy();
    case PRINT_WINDOW_HIERARCHY:
      return HandlePrintWindowHierarchy();
    default:
      NOTREACHED() << "Unhandled action " << action;
  }
  return false;
}

void AcceleratorController::SetBrightnessControlDelegate(
    scoped_ptr<BrightnessControlDelegate> brightness_control_delegate) {
  brightness_control_delegate_ = brightness_control_delegate.Pass();
}

void AcceleratorController::SetImeControlDelegate(
    scoped_ptr<ImeControlDelegate> ime_control_delegate) {
  ime_control_delegate_ = ime_control_delegate.Pass();
}

void AcceleratorController::SetScreenshotDelegate(
    scoped_ptr<ScreenshotDelegate> screenshot_delegate) {
  screenshot_delegate_ = screenshot_delegate.Pass();
}

////////////////////////////////////////////////////////////////////////////////
// AcceleratorController, ui::AcceleratorTarget implementation:

bool AcceleratorController::AcceleratorPressed(
    const ui::Accelerator& accelerator) {
  std::map<ui::Accelerator, int>::const_iterator it =
      accelerators_.find(accelerator);
  DCHECK(it != accelerators_.end());
  return PerformAction(static_cast<AcceleratorAction>(it->second), accelerator);
}

void AcceleratorController::RegisterAccelerators(
    const AcceleratorData accelerators[],
    size_t accelerators_length) {
  for (size_t i = 0; i < accelerators_length; ++i) {
    ui::Accelerator accelerator(accelerators[i].keycode,
                                accelerators[i].modifiers);
    accelerator.set_type(accelerators[i].trigger_on_press ?
                         ui::ET_KEY_PRESSED : ui::ET_KEY_RELEASED);
    Register(accelerator, this);
    accelerators_.insert(
        std::make_pair(accelerator, accelerators[i].action));
  }
}

void AcceleratorController::SetKeyboardBrightnessControlDelegate(
    scoped_ptr<KeyboardBrightnessControlDelegate>
    keyboard_brightness_control_delegate) {
  keyboard_brightness_control_delegate_ =
      keyboard_brightness_control_delegate.Pass();
}

bool AcceleratorController::CanHandleAccelerators() const {
  return true;
}

}  // namespace ash
/* [<][>][^][v][top][bottom][index][help] */
root/ash/accelerators/accelerator_controller.cc

DEFINITIONS
