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92 lines
3.0 KiB
C++
92 lines
3.0 KiB
C++
//
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// Keyboard.hpp
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// Clock Signal
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//
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// Created by Thomas Harte on 10/9/17.
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// Copyright 2017 Thomas Harte. All rights reserved.
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//
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#pragma once
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#include <vector>
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#include <set>
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namespace Inputs {
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/*!
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Provides an intermediate idealised model of a modern-era computer keyboard
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(so, heavily indebted to the current Windows and Mac layouts), allowing a host
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machine to toggle states, while an interested party either observes or polls.
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*/
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class Keyboard {
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public:
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enum class Key {
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Escape, F1, F2, F3, F4, F5, F6, F7, F8, F9, F10, F11, F12, PrintScreen, ScrollLock, Pause,
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BackTick, k1, k2, k3, k4, k5, k6, k7, k8, k9, k0, Hyphen, Equals, Backspace,
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Tab, Q, W, E, R, T, Y, U, I, O, P, OpenSquareBracket, CloseSquareBracket, Backslash,
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CapsLock, A, S, D, F, G, H, J, K, L, Semicolon, Quote, Hash, Enter,
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LeftShift, Z, X, C, V, B, N, M, Comma, FullStop, ForwardSlash, RightShift,
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LeftControl, LeftOption, LeftMeta, Space, RightMeta, RightOption, RightControl,
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Left, Right, Up, Down,
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Insert, Home, PageUp, Delete, End, PageDown,
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NumLock, KeypadSlash, KeypadAsterisk, KeypadDelete,
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Keypad7, Keypad8, Keypad9, KeypadPlus,
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Keypad4, Keypad5, Keypad6, KeypadMinus,
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Keypad1, Keypad2, Keypad3, KeypadEnter,
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Keypad0, KeypadDecimalPoint, KeypadEquals,
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Help,
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Max = Help
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};
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/// Constructs a Keyboard that declares itself to observe all keys.
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Keyboard(const std::set<Key> &essential_modifiers = {});
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/// Constructs a Keyboard that declares itself to observe only members of @c observed_keys.
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Keyboard(const std::set<Key> &observed_keys, const std::set<Key> &essential_modifiers);
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virtual ~Keyboard() = default;
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// Host interface.
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/// @returns @c true if the key press affects the machine; @c false otherwise.
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virtual bool set_key_pressed(Key key, char value, bool is_pressed, bool is_repeat);
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virtual void reset_all_keys();
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/// @returns a set of all Keys that this keyboard responds to.
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virtual const std::set<Key> &observed_keys() const;
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/// @returns the list of modifiers that this keyboard considers 'essential' (i.e. both mapped and highly used).
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virtual const std::set<Inputs::Keyboard::Key> &get_essential_modifiers() const;
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/*!
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@returns @c true if this keyboard, on its original machine, looked
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like a complete keyboard — i.e. if a user would expect this keyboard
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to be the only thing a real keyboard maps to.
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So this would be true of something like the Amstrad CPC, which has a full
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keyboard, but it would be false of something like the Sega Master System
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which has some buttons that you'd expect an emulator to map to its host
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keyboard but which does not offer a full keyboard.
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*/
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virtual bool is_exclusive() const;
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// Delegate interface.
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struct Delegate {
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virtual bool keyboard_did_change_key(Keyboard &, Key, bool is_pressed) = 0;
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virtual void reset_all_keys(Keyboard &) = 0;
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};
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void set_delegate(Delegate *);
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bool get_key_state(Key) const;
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private:
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std::set<Key> observed_keys_;
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const std::set<Key> essential_modifiers_;
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const bool is_exclusive_ = true;
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std::vector<bool> key_states_;
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Delegate *delegate_ = nullptr;
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};
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}
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