public/fidl/fuchsia.accessibility/toggler.fidl

// Copyright 2018 The Fuchsia Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

library fuchsia.accessibility;

// This interface is intended to provide a simple centralized switch to turn
// on or off accessibility support throughout the system. We intend for this to
// be implemented solely by the accessibility manager, and called solely by a privileged
// client, such as the session shell.
[Discoverable]
interface Toggler {
  // Allows for enabling or disabling accessibility support in services connected to the
  // accessibility toggle broadcaster.
  1: ToggleAccessibilitySupport(bool enabled);
};

// The accessibility toggle broadcaster notifies clients when the toggler receives a call to
// toggle accessibility support.
// The current intended audience for this includes:
// - Front-ends like Flutter which need to enable semantic information for accessibility.
// - Root presenter, which needs to re-route raw input to an accessibility input dispatch.
// - Accessibility touch dispatcher, which should only be enabled when accessibility is turned on.
[Discoverable]
interface ToggleBroadcaster {
  // Notify the client that accessibility support has been enabled or disabled. Clients should
  // use this to enable or disable their own custom accessibility support.
  1: -> OnAccessibilityToggle(bool enabled);
};