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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;
}