sdk/fidl/fuchsia.ui.pointer/state.fidl

// Copyright 2020 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.ui.pointer;

/// The possible states of a pointer event stream's state machine.
/// A pointer event stream follows these state machines:
/// ADD - CHANGE* - REMOVE
/// ADD - CHANGE* - CANCEL
enum EventPhase {
    /// The device has started tracking the pointer.
    ADD = 1;

    /// The device has reported an update to the pointer state.
    CHANGE = 2;

    /// The device has stopped tracking the pointer.
    REMOVE = 3;

    /// The event stream is no longer available.
    CANCEL = 4;
};