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// 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 <stddef.h>
#include <map>
#include <memory>
#include <set>
#include <vector>
#include "ash/accelerators/accelerator_confirmation_dialog.h"
#include "ash/accelerators/accelerator_table.h"
#include "ash/accelerators/exit_warning_handler.h"
#include "ash/ash_export.h"
#include "ash/public/interfaces/accelerator_controller.mojom.h"
#include "ash/public/interfaces/volume.mojom.h"
#include "base/compiler_specific.h"
#include "base/gtest_prod_util.h"
#include "base/macros.h"
#include "mojo/public/cpp/bindings/binding_set.h"
#include "ui/base/accelerators/accelerator.h"
#include "ui/base/accelerators/accelerator_history.h"
namespace ui {
class AcceleratorManager;
namespace ash {
struct AcceleratorData;
class ExitWarningHandler;
// Identifiers for toggling accelerator notifications.
ASH_EXPORT extern const char kHighContrastToggleAccelNotificationId[];
ASH_EXPORT extern const char kDockedMagnifierToggleAccelNotificationId[];
ASH_EXPORT extern const char kFullscreenMagnifierToggleAccelNotificationId[];
// AcceleratorController provides functions for registering or unregistering
// global keyboard accelerators, which are handled earlier than any windows. It
// also implements several handlers as an accelerator target.
class ASH_EXPORT AcceleratorController : public ui::AcceleratorTarget,
public mojom::AcceleratorController {
// Fields of the side volume button location info.
static constexpr const char* kVolumeButtonRegion = "region";
static constexpr const char* kVolumeButtonSide = "side";
// Values of kVolumeButtonRegion.
static constexpr const char* kVolumeButtonRegionKeyboard = "keyboard";
static constexpr const char* kVolumeButtonRegionScreen = "screen";
// Values of kVolumeButtonSide.
static constexpr const char* kVolumeButtonSideLeft = "left";
static constexpr const char* kVolumeButtonSideRight = "right";
static constexpr const char* kVolumeButtonSideTop = "top";
static constexpr const char* kVolumeButtonSideBottom = "bottom";
~AcceleratorController() override;
// A list of possible ways in which an accelerator should be restricted before
// processing. Any target registered with this controller should respect
// restrictions by calling |GetCurrentAcceleratorRestriction| during
// processing.
enum AcceleratorProcessingRestriction {
// Process the accelerator normally.
// Don't process the accelerator.
// Don't process the accelerator and prevent propagation to other targets.
// Some Chrome OS devices have volume up and volume down buttons on their
// side. We want the button that's closer to the top/right to increase the
// volume and the button that's closer to the bottom/left to decrease the
// volume, so we use the buttons' location and the device orientation to
// determine whether the buttons should be swapped.
struct SideVolumeButtonLocation {
// The button can be at the side of the keyboard or the display. Then value
// of the region could be kVolumeButtonRegionKeyboard or
// kVolumeButtonRegionScreen.
std::string region;
// Side info of region. The value could be kVolumeButtonSideLeft,
// kVolumeButtonSideRight, kVolumeButtonSideTop or kVolumeButtonSideBottom.
std::string side;
// Registers global keyboard accelerators for the specified target. If
// multiple targets are registered for any given accelerator, a target
// registered later has higher priority.
void Register(const std::vector<ui::Accelerator>& accelerators,
ui::AcceleratorTarget* target);
// Unregisters the specified keyboard accelerator for the specified target.
void Unregister(const ui::Accelerator& accelerator,
ui::AcceleratorTarget* target);
// Unregisters all keyboard accelerators for the specified target.
void UnregisterAll(ui::AcceleratorTarget* target);
// Returns true if there is an action for |accelerator| and it is enabled.
bool IsActionForAcceleratorEnabled(const ui::Accelerator& accelerator) const;
// Activates the target associated with the specified accelerator.
// First, AcceleratorPressed handler of the most recently registered target
// is called, and if that handler processes the event (i.e. returns true),
// this method immediately returns. If not, we do the same thing on the next
// target, and so on.
// Returns true if an accelerator was activated.
bool Process(const ui::Accelerator& accelerator);
// Returns true if the |accelerator| is registered.
bool IsRegistered(const ui::Accelerator& accelerator) const;
// Returns true if the |accelerator| is preferred. A preferred accelerator
// is handled before being passed to an window/web contents, unless
// the window is in fullscreen state.
bool IsPreferred(const ui::Accelerator& accelerator) const;
// Returns true if the |accelerator| is reserved. A reserved accelerator
// is always handled and will never be passed to an window/web contents.
bool IsReserved(const ui::Accelerator& accelerator) const;
// Returns true if the |accelerator| is deprecated. Deprecated accelerators
// can be consumed by web contents if needed.
bool IsDeprecated(const ui::Accelerator& accelerator) const;
// Performs the specified action if it is enabled. Returns whether the action
// was performed successfully.
bool PerformActionIfEnabled(
AcceleratorAction action,
const ui::Accelerator& accelerator = ui::Accelerator());
// Returns the restriction for the current context.
AcceleratorProcessingRestriction GetCurrentAcceleratorRestriction();
// Provides access to the ExitWarningHandler for testing.
ExitWarningHandler* GetExitWarningHandlerForTest() {
return &exit_warning_handler_;
// Returns true if the menu should close in order to perform the accelerator.
bool ShouldCloseMenuAndRepostAccelerator(
const ui::Accelerator& accelerator) const;
ui::AcceleratorHistory* accelerator_history() {
return accelerator_history_.get();
// Overridden from ui::AcceleratorTarget:
bool AcceleratorPressed(const ui::Accelerator& accelerator) override;
bool CanHandleAccelerators() const override;
// Binds the mojom::AcceleratorController interface to this object.
void BindRequest(mojom::AcceleratorControllerRequest request);
// mojom::AcceleratorController:
void SetVolumeController(mojom::VolumeControllerPtr controller) override;
// A confirmation dialog will be shown the first time an accessibility feature
// is enabled using the specified accelerator key sequence. Only one dialog
// will be shown at a time, and will not be shown again if the user has
// selected "accept" on a given dialog. The dialog was added to ensure that
// users would be aware of the shortcut they have just enabled, and to prevent
// users from accidentally triggering the feature. The dialog is currently
// shown when enabling the following features: high contrast, full screen
// magnifier and docked magnifier. The shown dialog is stored as a weak
// pointer in the variable |confirmation_dialog_| below.
void MaybeShowConfirmationDialog(int window_title_text_id,
int dialog_text_id,
base::OnceClosure on_accept_callback);
// Read the side volume button location info from local file under
// kSideVolumeButtonLocationFilePath, parse and write it into
// |side_volume_button_location_|.
void ParseSideVolumeButtonLocationInfo();
// Accessor to accelerator confirmation dialog.
AcceleratorConfirmationDialog* confirmation_dialog_for_testing() {
return confirmation_dialog_.get();
void set_side_volume_button_file_path_for_testing(base::FilePath path) {
side_volume_button_location_file_path_ = path;
SideVolumeButtonLocation side_volume_button_location_for_testing() {
return side_volume_button_location_;
FRIEND_TEST_ALL_PREFIXES(AcceleratorControllerTest, GlobalAccelerators);
// Initializes the accelerators this class handles as a target.
void Init();
// Registers the specified accelerators.
void RegisterAccelerators(const AcceleratorData accelerators[],
size_t accelerators_length);
// Registers the deprecated accelerators and their replacing new ones.
void RegisterDeprecatedAccelerators();
// Returns whether |action| can be performed. The |accelerator| may provide
// additional data the action needs.
bool CanPerformAction(AcceleratorAction action,
const ui::Accelerator& accelerator) const;
// Performs the specified action. The |accelerator| may provide additional
// data the action needs.
void PerformAction(AcceleratorAction action,
const ui::Accelerator& accelerator);
// Returns whether performing |action| should consume the key event.
bool ShouldActionConsumeKeyEvent(AcceleratorAction action);
// Get the accelerator restriction for the given action. Supply an |action|
// of -1 to get restrictions that apply for the current context.
AcceleratorProcessingRestriction GetAcceleratorProcessingRestriction(
int action) const;
// If |accelerator| is a deprecated accelerator, it performs the appropriate
// deprecated accelerator pre-handling.
// Returns PROCEED if the accelerator's action should be performed (i.e. if
// |accelerator| is not a deprecated accelerator, or it's an enabled
// deprecated accelerator), and STOP otherwise (if the accelerator is a
// disabled deprecated accelerator).
enum class AcceleratorProcessingStatus { PROCEED, STOP };
AcceleratorProcessingStatus MaybeDeprecatedAcceleratorPressed(
AcceleratorAction action,
const ui::Accelerator& accelerator) const;
std::unique_ptr<ui::AcceleratorManager> accelerator_manager_;
// A tracker for the current and previous accelerators.
std::unique_ptr<ui::AcceleratorHistory> accelerator_history_;
// Handles the exit accelerator which requires a double press to exit and
// shows a popup with an explanation.
ExitWarningHandler exit_warning_handler_;
// A map from accelerators to the AcceleratorAction values, which are used in
// the implementation.
std::map<ui::Accelerator, AcceleratorAction> accelerators_;
std::map<AcceleratorAction, const DeprecatedAcceleratorData*>
std::set<ui::Accelerator> deprecated_accelerators_;
// Bindings for the mojom::AcceleratorController interface.
mojo::BindingSet<mojom::AcceleratorController> bindings_;
// Volume controller interface in chrome browser. May be null in tests. Exists
// because chrome owns the CrasAudioHandler dbus communication.
mojom::VolumeControllerPtr volume_controller_;
// Actions allowed when the user is not signed in.
std::set<int> actions_allowed_at_login_screen_;
// Actions allowed when the screen is locked.
std::set<int> actions_allowed_at_lock_screen_;
// Actions allowed when the power menu is opened.
std::set<int> actions_allowed_at_power_menu_;
// Actions allowed when a modal window is up.
std::set<int> actions_allowed_at_modal_window_;
// Preferred actions. See accelerator_table.h for details.
std::set<int> preferred_actions_;
// Reserved actions. See accelerator_table.h for details.
std::set<int> reserved_actions_;
// Actions which will be repeated while holding the accelerator key.
std::set<int> repeatable_actions_;
// Actions allowed in app mode.
std::set<int> actions_allowed_in_app_mode_;
// Actions allowed in pinned mode.
std::set<int> actions_allowed_in_pinned_mode_;
// Actions allowed when Kiosk Next Shell is enabled.
std::set<int> actions_allowed_for_kiosk_next_shell_;
// Actions disallowed if there are no windows.
std::set<int> actions_needing_window_;
// Actions that can be performed without closing the menu (if one is present).
std::set<int> actions_keeping_menu_open_;
// Holds a weak pointer to the accelerator confirmation dialog.
base::WeakPtr<AcceleratorConfirmationDialog> confirmation_dialog_;
// Path of the file that contains the side volume button location info. It
// should always be kSideVolumeButtonLocationFilePath. But it is allowed to be
// set to different paths in test.
base::FilePath side_volume_button_location_file_path_;
// Stores the location info of side volume button.
SideVolumeButtonLocation side_volume_button_location_;
} // namespace ash