Swallow example

This is a simple example in which we create a rect and swallow it.

Focusing on the relevant parts of the code we go right to the creation of our rectangle. It should be noted that we don't resize or show our rect, that is because when an object is swallowed it's geometry and visibility is controlled by the theme:

   rect = evas_object_rectangle_add(evas);
   evas_object_color_set(rect, 255, 0, 0, 255);
   edje_object_part_swallow(edje_obj, "part_one", rect);

The other bit of code that is relevant to us now is our check that the swallow worked:

   obj = edje_object_part_swallow_get(edje_obj, "part_one");
   if(obj == rect)
      printf("Swallowing worked!\n");

The full source code follows:

#ifdef HAVE_CONFIG_H
#include "config.h"
#else
#define PACKAGE_EXAMPLES_DIR "."
#define __UNUSED__
#endif

#include <Ecore.h>
#include <Ecore_Evas.h>
#include <Edje.h>

#define WIDTH  (300)
#define HEIGHT (300)

static const char *edje_file_path = PACKAGE_EXAMPLES_DIR "/swallow.edj";

static Ecore_Evas *ee;
static Evas_Object *bg;

static void
_on_delete(Ecore_Evas *ee __UNUSED__)
{
   ecore_main_loop_quit();
}

/* here just to keep our example's window size and background image's
 * size in synchrony */
static void
_canvas_resize_cb(Ecore_Evas *ee)
{
   int w, h;

   ecore_evas_geometry_get(ee, NULL, NULL, &w, &h);
   evas_object_resize(bg, w, h);
}

int
main(void)
{
   Evas_Object *edje_obj, *rect, *obj;
   Evas *evas;

   ecore_evas_init();
   edje_init();

   /* this will give you a window with an Evas canvas under the first
    * engine available */
   ee = ecore_evas_new(NULL, 0, 0, WIDTH, HEIGHT, NULL);

   ecore_evas_callback_delete_request_set(ee, _on_delete);
   ecore_evas_callback_resize_set(ee, _canvas_resize_cb);
   ecore_evas_title_set(ee, "Edje Swallow Example");
   ecore_evas_show(ee);

   evas = ecore_evas_get(ee);

   bg = evas_object_rectangle_add(evas);
   evas_object_color_set(bg, 255, 255, 255, 255); /* white bg */
   evas_object_move(bg, 0, 0); /* at canvas' origin */
   evas_object_resize(bg, WIDTH, HEIGHT); /* covers full canvas */
   evas_object_show(bg);

   edje_obj = edje_object_add(evas);

   edje_object_file_set(edje_obj, edje_file_path, "example_group");
   evas_object_move(edje_obj, 20, 20);
   evas_object_resize(edje_obj, WIDTH - 40, HEIGHT - 40);
   evas_object_show(edje_obj);

   rect = evas_object_rectangle_add(evas);
   evas_object_color_set(rect, 255, 0, 0, 255);
   edje_object_part_swallow(edje_obj, "part_one", rect);

   obj = edje_object_part_swallow_get(edje_obj, "part_one");
   if(obj == rect)
      printf("Swallowing worked!\n");

   ecore_main_loop_begin();

   ecore_evas_free(ee);
   ecore_evas_shutdown();
   edje_shutdown();
   return 0;
}