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63 lines
2.1 KiB
C++
63 lines
2.1 KiB
C++
//
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// ActivityObserver.h
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// Clock Signal
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//
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// Created by Thomas Harte on 07/05/2018.
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// Copyright 2018 Thomas Harte. All rights reserved.
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//
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#ifndef ActivityObserver_h
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#define ActivityObserver_h
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#include <cstdint>
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#include <string>
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namespace Activity {
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/*!
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Provides a purely virtual base class for anybody that wants to receive notifications of
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'activity': any feedback from an emulated system which a user could perceive other than
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through the machine's native audio and video outputs.
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So: status LEDs, drive activity, etc. A receiver may choose to make appropriate noises
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and/or to show or unshow status indicators.
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*/
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class Observer {
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public:
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virtual ~Observer() {}
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/// Provides hints as to the sort of information presented on an LED.
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enum LEDPresentation: uint8_t {
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/// This LED informs the user of some sort of persistent state, e.g. scroll lock.
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/// If this flag is absent then the LED describes an ephemeral state, such as media access.
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Persistent = (1 << 0),
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};
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/// Announces to the receiver that there is an LED of name @c name.
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virtual void register_led([[maybe_unused]] const std::string &name, [[maybe_unused]] uint8_t presentation = 0) {}
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/// Announces to the receiver that there is a drive of name @c name.
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///
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/// If a drive has the same name as an LED, that LED goes with this drive.
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virtual void register_drive([[maybe_unused]] const std::string &name) {}
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/// Informs the receiver of the new state of the LED with name @c name.
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virtual void set_led_status([[maybe_unused]] const std::string &name, [[maybe_unused]] bool lit) {}
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enum class DriveEvent {
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StepNormal,
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StepBelowZero,
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StepBeyondMaximum
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};
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/// Informs the receiver that the named event just occurred for the drive with name @c name.
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virtual void announce_drive_event([[maybe_unused]] const std::string &name, [[maybe_unused]] DriveEvent event) {}
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/// Informs the receiver of the motor-on status of the drive with name @c name.
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virtual void set_drive_motor_status([[maybe_unused]] const std::string &name, [[maybe_unused]] bool is_on) {}
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};
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}
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#endif /* ActivityObserver_h */
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