Olivier Smeesters
/
DtmfKit
A DTMF sequence editor and player for HAM radio equipment command & control.
Diff: KeyboardManager/kbd_mgr/KeyboardState.h
- Revision:
- 0:1324e7d9d471
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/KeyboardManager/kbd_mgr/KeyboardState.h Mon Mar 07 22:51:19 2011 +0000 @@ -0,0 +1,94 @@ +#ifndef KEYBOARD_STATE_H_ +#define KEYBOARD_STATE_H_ + +#include <vector> +#include <iostream> + +namespace kbd_mgr { + +/** + * @brief A class to hold the state of a keyboard. + * A keyboard is handled as a set of key rows. Each row can have as many keys as there are bits in integers. + * The class maintains an array of integers to handle the number of rows. + * If possible, multiple rows are combined in a single integer to reduce memory footprint. + */ +class KeyboardState { +public: + /** + * @brief Constructor for a 0x0 keyboard state. + */ + KeyboardState(); + + /** + * @brief Constructor for a NxM keyboard state. + * @param numRows Number of key rows (unlimited) + * @param numKeysPerRow Number of keys per row (limited to the number of bits in an integer). + */ + KeyboardState(std::size_t numRows, std::size_t numKeysPerRow); + + std::size_t getNumRows() const { return this->numRows; } + std::size_t getNumKeysPerRow() const { return this->numKeysPerRow; } + std::size_t getNumKeys() const { return this->numRows * this->numKeysPerRow; } + + void clear(); + void setRowState(std::size_t row, int rowState); + int getRowState(std::size_t row) const; + bool getKeyState(std::size_t key) const; + + /** + * @brief Executes a XOR between two states. + * @return a state that represents the keys that changed of state. + */ + KeyboardState operator^(const KeyboardState &other) const; + + /** + * @brief Executes an AND between two states. + */ + KeyboardState operator&(const KeyboardState &mask) const; + + bool operator==(const KeyboardState &other) const; + bool operator!=(const KeyboardState &other) const { return !(*this == other); } + + /** + * @brief Checks if a keyboard state is full of 0. + */ + bool empty() const; + + enum KeyPressType { + Idle, SingleKeyPress, MultiKeyPress + }; + + /** + * @brief Determines the kind of key press present in the state. + * The keyboard state can represent an idle keyboard, a single key pressed + * or a key combination. This method determines which type of state this is. + * If a single key is represented, the key index can be retrieved. + * @param key An integer where the single key pressed should be stored. + */ + KeyPressType getKeyPressType(int *key = NULL) const; + KeyPressType getKeyPressType(int &key) const { return getKeyPressType(&key); } + + void streamTo(std::ostream &out) const; + +private: + int getRowInfo(std::size_t row, std::size_t &wordIndex, std::size_t &rowShift, int &rowMask) const; + + std::size_t numRows; + std::size_t numKeysPerRow; + int rowMask; + std::size_t numRowsPerWord; + std::size_t numKeysPerWord; + std::size_t numWords; + + typedef std::vector<int> Data; + Data data; +}; + +inline std::ostream & operator<<(std::ostream &out, const KeyboardState &s) { + s.streamTo(out); + return out; +} + +} // kbd_mgr + +#endif // KEYBOARD_STATE_H_