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a8645f80bf
i.e. sets of keys that don't amount to an entire keyboard in the modern sense. Experimentally used by the Master System for its reset key.
100 lines
2.6 KiB
C++
100 lines
2.6 KiB
C++
//
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// KeyboardMachine.h
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// Clock Signal
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//
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// Created by Thomas Harte on 05/11/2016.
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// Copyright 2016 Thomas Harte. All rights reserved.
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//
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#ifndef KeyboardMachine_h
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#define KeyboardMachine_h
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#include <cstdint>
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#include <string>
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#include "../Inputs/Keyboard.hpp"
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namespace KeyboardMachine {
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/*!
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Covers just the actions necessary to communicate keyboard state, as a purely abstract class.
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*/
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struct KeyActions {
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/*!
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Indicates that the key @c key has been either pressed or released, according to
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the state of @c isPressed.
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*/
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virtual void set_key_state(uint16_t key, bool is_pressed) {}
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/*!
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Instructs that all keys should now be treated as released.
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*/
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virtual void clear_all_keys() {}
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};
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/*!
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Describes an emulated machine which exposes a keyboard and accepts a typed string.
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*/
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class Machine: public KeyActions {
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public:
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/*!
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Causes the machine to attempt to type the supplied string.
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This is best effort. Success or failure is permitted to be a function of machine and current state.
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*/
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virtual void type_string(const std::string &);
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/*!
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Provides a destination for keyboard input.
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*/
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virtual Inputs::Keyboard &get_keyboard() = 0;
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};
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/*!
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Provides a base class for machines that want to provide a keyboard mapper,
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allowing automatic mapping from keyboard inputs to KeyActions.
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*/
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class MappedMachine: public Inputs::Keyboard::Delegate, public Machine {
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public:
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MappedMachine();
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/*!
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A keyboard mapper attempts to provide a physical mapping between host keys and emulated keys.
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See the character mapper for logical mapping.
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*/
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class KeyboardMapper {
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public:
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virtual uint16_t mapped_key_for_key(Inputs::Keyboard::Key key) = 0;
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};
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/// Terminates a key sequence from the character mapper.
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static const uint16_t KeyEndSequence = 0xffff;
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/*!
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Indicates that a key is not mapped (for the keyboard mapper) or that a
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character cannot be typed (for the character mapper).
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*/
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static const uint16_t KeyNotMapped = 0xfffe;
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/*!
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Allows individual machines to provide the mapping between host keys
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as per Inputs::Keyboard and their native scheme.
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*/
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virtual KeyboardMapper *get_keyboard_mapper();
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/*!
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Provides a keyboard that obtains this machine's keyboard mapper, maps
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the key and supplies it via the KeyActions.
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*/
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virtual Inputs::Keyboard &get_keyboard() override;
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private:
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void keyboard_did_change_key(Inputs::Keyboard *keyboard, Inputs::Keyboard::Key key, bool is_pressed) override;
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void reset_all_keys(Inputs::Keyboard *keyboard) override;
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Inputs::Keyboard keyboard_;
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};
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}
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#endif /* KeyboardMachine_h */
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