ecore_event_example_02.c

This example shows how to setup, change, and delete event handlers. See the explanation here.

//Compile with:
// gcc -g -Wall -o ecore_event_example_02 ecore_event_example_02.c `pkg-config --cflags --libs ecore`

#include <Ecore.h>
#include <unistd.h>

struct context   // helper struct to give some context to the callbacks
{
   const char          *str1, *str2;
   Ecore_Event_Handler *handler1;
   Ecore_Event_Handler *handler2;
};

static int _event_type = 0; // a new type of event will be defined and stored here

static Eina_Bool
_event_handler1_cb(void *data, int type EINA_UNUSED, void *event)
{
   int *number = event;
   const char *str = data;

   printf("event_handler1: number=%d, data=\"%s\".\n", *number, str);

   if ((*number % 2) == 0)
     return ECORE_CALLBACK_DONE;

   return ECORE_CALLBACK_PASS_ON;
}

static Eina_Bool
_event_handler2_cb(void *data, int type EINA_UNUSED, void *event) // event callback
{
   struct context *ctxt = data;
   int *number = event;

   printf("event_handler2: number=%d.\n", *number);

   if (*number == 5)
     {
        const char *old = NULL;
        old = ecore_event_handler_data_set(ctxt->handler1, (void *)ctxt->str2);
        printf("changed handler1 data from \"%s\" to \"%s\".\n",
               old, ctxt->str2);
     }
   else if (*number >= 10)
     {
        printf("finish main loop.\n");
        ecore_main_loop_quit();
     }

   return ECORE_CALLBACK_DONE; // same as EINA_FALSE
}

int
main(void)
{
   struct context ctxt = {0};
   int i;
   ctxt.str1 = "dataone";
   ctxt.str2 = "datatwo";

   if (!ecore_init())
     {
        printf("ERROR: Cannot init Ecore!\n");
        return -1;
     }

   _event_type = ecore_event_type_new();

   ctxt.handler1 = ecore_event_handler_add(_event_type,
                                           _event_handler1_cb,
                                           ctxt.str1);
   ctxt.handler2 = ecore_event_handler_add(_event_type,
                                           _event_handler2_cb,
                                           &ctxt);

   for (i = 0; i <= 15; i++)
     {
        int *event_data = malloc(sizeof(*event_data));
        *event_data = i;
        ecore_event_add(_event_type, event_data, NULL, NULL);
     }

   printf("start the main loop.\n");

   ecore_main_loop_begin();

   ecore_shutdown();

   return 0;
}