// Copyright 2017 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.

module ash.mojom;

// Alert sent to the accessibility api.
enum AccessibilityAlert {
  // Default value, indicates no accessibility alert.
  NONE,

  // When caps lock is turned on.
  CAPS_ON,

  // When caps lock is turned off.
  CAPS_OFF,

  // When screen is turned on by tablet power button.
  SCREEN_ON,

  // When screen is turned off by tablet power button.
  SCREEN_OFF,

  // When window moved to above/below/left/right display by accelerators.
  WINDOW_MOVED_TO_ABOVE_DISPLAY,
  WINDOW_MOVED_TO_BELOW_DISPLAY,
  WINDOW_MOVED_TO_LEFT_DISPLAY,
  WINDOW_MOVED_TO_RIGHT_DISPLAY,

  // When the user attempts a keyboard command that requires a window to work,
  // and none is available.
  WINDOW_NEEDED,

  // When the user enters window overview mode.
  WINDOW_OVERVIEW_MODE_ENTERED
};

// Interface for ash client (e.g. Chrome) to control and query accessibility
// features.
interface AccessibilityController {
  // Sets the client interface.
  SetClient(AccessibilityControllerClient client);
};

// Interface for ash to request accessibility service from its client (e.g.
// Chrome).
interface AccessibilityControllerClient {
  // Triggers an accessibility alert to give the user feedback.
  TriggerAccessibilityAlert(AccessibilityAlert alert);
};