blob: 409170a6fcd950fd7f8e586e258ca4be24c3ab35 [file] [log] [blame]
// Copyright 2019 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.
#include <fuchsia/ui/activity/cpp/fidl.h>
#include <lib/zx/time.h>
#include <zircon/types.h>
#include <map>
#include <optional>
#include "src/lib/fxl/macros.h"
namespace activity {
inline std::ostream& operator<<(std::ostream& os, fuchsia::ui::activity::State s) {
switch (s) {
case fuchsia::ui::activity::State::UNKNOWN:
return os << "UNKNOWN";
case fuchsia::ui::activity::State::IDLE:
return os << "IDLE";
case fuchsia::ui::activity::State::ACTIVE:
return os << "ACTIVE";
return os;
// Input events.
enum Event { USER_INPUT, TIMEOUT };
inline std::ostream& operator<<(std::ostream& os, Event s) {
switch (s) {
case Event::USER_INPUT:
return os << "USER_INPUT";
case Event::TIMEOUT:
return os << "TIMEOUT";
return os;
// ActivityStateMachine is a state machine which take system and user activity as input and
// determine the current activity state of the system as output.
class ActivityStateMachine {
ActivityStateMachine() = default;
~ActivityStateMachine() = default;
// Provide input to the state machine.
void ReceiveEvent(Event event);
// Poll the current state of the state machine.
fuchsia::ui::activity::State state() const { return state_; }
// Returns the time in a state after which, if is no input is received, an
// Event::TIMEOUT should be delivered to the state machine.
// If the return is absent then the state should never receive Event::TIMEOUT.
static std::optional<zx::duration> TimeoutFor(fuchsia::ui::activity::State state);
// Translations from FIDL activities to internal Events.
// Translate |activity| to an appropriate Event.
constexpr static Event EventForDiscreteActivity(
const fuchsia::ui::activity::DiscreteActivity& activity) {
return Event::USER_INPUT;
// Returns an Event which should be delivered as an ongoing activity starts.
constexpr static Event EventForOngoingActivityStart() { return Event::USER_INPUT; }
// Returns an Event which should be delivered as an ongoing activity ends.
constexpr static Event EventForOngoingActivityEnd() { return Event::USER_INPUT; }
using StateTable =
std::map<std::pair<fuchsia::ui::activity::State, Event>, fuchsia::ui::activity::State>;
fuchsia::ui::activity::State state_ = fuchsia::ui::activity::State::IDLE;
const static StateTable kStateTable;
const static zx::duration kIdleDuration;
} // namespace activity