demo of driving MAX2719 dot matrix displays with STM32F103 Bluepill
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f103-dotmatrix/project/bus/event_handler.h

48 lines
1.3 KiB

#pragma once
#include "main.h"
#include "event_queue.h"
typedef bool (*EventHandlerCallback) (uint32_t hdlr_id, Event *evt, void **user_data);
/**
* @brief Register an event handler for event type
* @param type : handled event type
* @param handler : the handler func
* @return handler ID. Can be used to remove the handler.
*/
uint32_t register_event_handler(EventType type, EventHandlerCallback handler, void *user_data);
/**
* @brief Remove event handler by handler ID
* @param handler_id : handler ID, obtained when registering or in the callback.
* @return number of removed handlers
*/
int remove_event_handler(uint32_t handler_id);
/**
* @brief Handle an event
* @param event : pointer to the event to handle
*/
void run_event_handler(Event *event);
/**
* @brief Check if hansler exists
* @param handler_id : handler
* @return exists
*/
bool event_handler_exists(uint32_t handler_id);
/**
* @brief Create a link between two handlers (one direction).
*
* If handler A is linked to handler B, and handler A is removed,
* both handlers will perish.
*
* Make a circle if you need to chain more than two handlers.
*
* @param from : handler A
* @param to : handler B
* @param reciprocal : link also from B to A
* @return
*/
bool chain_event_handler(uint32_t from, uint32_t to, bool reciprocal);