- Main Page
- Related Pages
- Modules
- Namespaces
- Data Structures
- Files
- Examples

evas-stacking.c
#ifdef HAVE_CONFIG_H
#include "config.h"
#else
#define PACKAGE_EXAMPLES_DIR "."
#endif
#include <Ecore.h>
#include <Ecore_Evas.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#define WIDTH 320
#define HEIGHT 320
struct test_data
{
Ecore_Evas *ee;
Evas *canvas;
Evas_Object *bg;
Evas_Object *rects[3]; /* red, green, blue */
int layers[3]; /* default, below it, above it */
int cur_rect, cur_layer;
};
static struct test_data d = {0};
static const char *commands = \
"commands are:\n"
"\tc - change the target rectangle to operate on\n"
"\ta - stack target rectangle one level above\n"
"\tb - stack target rectangle one level below\n"
"\tt - stack target rectangle up to the top of its layer\n"
"\tm - stack target rectangle down to the bottom of its layer\n"
"\tp - toggle target rectangle's 'pass events' property\n"
"\tr - toggle target rectangle's 'repeat events' property\n"
"\ts - print current stacking information\n"
"\tl - change background rectangle's layer\n"
"\th - print help\n";
static const char *
_name_get(Evas_Object *o)
{
const char *s = evas_object_name_get(o);
if (!s) s = "(null)";
return s;
}
static void
_on_mouse_down(void *data EINA_UNUSED,
Evas *evas EINA_UNUSED,
Evas_Object *o,
void *einfo EINA_UNUSED)
{
fprintf(stdout, "Mouse down on rectangle %s!\n", _name_get(o));
}
/* 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(d.bg, w, h);
}
/* use the following commands to interact with this example - 'h' is
* the key for help */
static void
_on_keydown(void *data EINA_UNUSED,
Evas *evas EINA_UNUSED,
Evas_Object *o EINA_UNUSED,
void *einfo)
{
Evas_Event_Key_Down *ev = einfo;
const char *name = _name_get(d.rects[d.cur_rect]);
if (strcmp(ev->key, "h") == 0) /* print help */
{
fprintf(stdout, commands);
return;
}
if (strcmp(ev->key, "s") == 0) /* get status of the
* rectangles WRT size
* hints */
{
Evas_Object *rect;
fprintf(stdout, "Order of stacking, from top to bottom, is: ");
rect = evas_object_top_get(evas);
fprintf(stdout, "%s", _name_get(rect));
rect = evas_object_below_get(rect);
while (rect)
{
fprintf(stdout, ", %s", _name_get(rect));
rect = evas_object_below_get(rect);
}
fprintf(stdout, ".\n");
fprintf(stdout, "Current target rectangle is %s\n",
_name_get(d.rects[d.cur_rect]));
fprintf(stdout, "Background rectangle's layer is %d\n",
evas_object_layer_get(d.bg));
return;
}
if (strcmp(ev->key, "l") == 0) /* change background rectangle's layer */
{
d.cur_layer = (d.cur_layer + 1) % 3;
evas_object_layer_set(d.bg, d.layers[d.cur_layer]);
fprintf(stdout, "Changing background rectangle's layer to %d\n",
d.layers[d.cur_layer]);
return;
}
if (strcmp(ev->key, "c") == 0) /* change rectangle to operate on */
{
d.cur_rect = (d.cur_rect + 1) % 3;
fprintf(stdout, "Changing target rectangle to the %s one\n",
_name_get(d.rects[d.cur_rect]));
return;
}
if (strcmp(ev->key, "t") == 0) /* bring target to top */
{
Evas_Object *neighbour;
evas_object_raise(d.rects[d.cur_rect]);
fprintf(stdout, "%s rectangle was re-stacked to the top if its layer\n",
name);
neighbour = evas_object_below_get(d.rects[d.cur_rect]);
fprintf(stdout, "Below of %s rect is %s\n", name,
neighbour ? _name_get(neighbour) : "no object");
return;
}
if (strcmp(ev->key, "m") == 0) /* bring target to bottom */
{
Evas_Object *neighbour;
evas_object_lower(d.rects[d.cur_rect]);
fprintf(stdout,
"%s rectangle was re-stacked to the bottom if its layer\n",
name);
neighbour = evas_object_below_get(d.rects[d.cur_rect]);
fprintf(stdout, "Below of %s rect is %s\n", name,
neighbour ? _name_get(neighbour) : "no object");
return;
}
if (strcmp(ev->key, "p") == 0) /* toggle pass events */
{
Eina_Bool pass = evas_object_pass_events_get(d.rects[d.cur_rect]);
evas_object_pass_events_set(d.rects[d.cur_rect], !pass);
fprintf(stdout, "%s rectangle is now set to%s pass (ignore) events\n",
name, pass ? " NOT" : "");
return;
}
if (strcmp(ev->key, "r") == 0) /* toggle repeat events */
{
Eina_Bool repeat = evas_object_repeat_events_get(d.rects[d.cur_rect]);
evas_object_repeat_events_set(d.rects[d.cur_rect], !repeat);
fprintf(stdout, "%s rectangle is now set to%s repeat events\n",
name, repeat ? " NOT" : "");
return;
}
if (strcmp(ev->key, "a") == 0) /* stack target above */
{
Evas_Object *neighbour = evas_object_above_get(d.rects[d.cur_rect]);
if (!neighbour || (evas_object_layer_get(d.rects[d.cur_rect]) !=
evas_object_layer_get(neighbour)))
return;
evas_object_stack_above(d.rects[d.cur_rect], neighbour);
fprintf(stdout, "%s rectangle was re-stacked one level above\n", name);
neighbour = evas_object_above_get(d.rects[d.cur_rect]);
fprintf(stdout, "Above of %s rect is %s\n", name,
neighbour ? _name_get(neighbour) : "no object");
neighbour = evas_object_below_get(d.rects[d.cur_rect]);
fprintf(stdout, "Below of %s rect is %s\n", name,
neighbour ? _name_get(neighbour) : "no object");
return;
}
if (strcmp(ev->key, "b") == 0) /* stack target below */
{
Evas_Object *neighbour = evas_object_below_get(d.rects[d.cur_rect]);
if (!neighbour || (evas_object_layer_get(d.rects[d.cur_rect]) !=
evas_object_layer_get(neighbour)))
return;
evas_object_stack_below(d.rects[d.cur_rect], neighbour);
fprintf(stdout, "%s rectangle was re-stacked one level below\n", name);
neighbour = evas_object_above_get(d.rects[d.cur_rect]);
fprintf(stdout, "Above of %s rect is %s\n", name,
neighbour ? _name_get(neighbour) : "no object");
neighbour = evas_object_below_get(d.rects[d.cur_rect]);
fprintf(stdout, "Below of %s rect is %s\n", name,
neighbour ? _name_get(neighbour) : "no object");
return;
}
}
static void
_on_destroy(Ecore_Evas *ee EINA_UNUSED)
{
ecore_main_loop_quit();
}
int
main(void)
{
if (!ecore_evas_init())
return EXIT_FAILURE;
/* this will give you a window with an Evas canvas under the first
* engine available */
d.ee = ecore_evas_new(NULL, 0, 0, WIDTH, HEIGHT, NULL);
if (!d.ee)
goto error;
ecore_evas_callback_destroy_set(d.ee, _on_destroy);
ecore_evas_callback_resize_set(d.ee, _canvas_resize_cb);
ecore_evas_show(d.ee);
/* the canvas pointer, de facto */
d.canvas = ecore_evas_get(d.ee);
d.bg = evas_object_rectangle_add(d.canvas);
evas_object_name_set(d.bg, "background"); /* white bg */
evas_object_color_set(d.bg, 255, 255, 255, 255);
evas_object_move(d.bg, 0, 0);
evas_object_resize(d.bg, WIDTH, HEIGHT);
d.layers[0] = evas_object_layer_get(d.bg);
d.layers[1] = d.layers[0] - 1;
d.layers[2] = d.layers[0] + 1;
d.cur_layer = 1;
evas_object_layer_set(d.bg, d.layers[d.cur_layer]); /* let's start with it
* below the default
* layer */
evas_object_show(d.bg);
evas_object_focus_set(d.bg, EINA_TRUE);
evas_object_event_callback_add(
d.bg, EVAS_CALLBACK_KEY_DOWN, _on_keydown, NULL);
d.rects[2] = evas_object_rectangle_add(d.canvas);
evas_object_name_set(d.rects[2], "blue");
evas_object_color_set(d.rects[2], 0, 0, 255, 255);
evas_object_resize(d.rects[2], WIDTH / 2.2, WIDTH / 2.2);
evas_object_move(d.rects[2], WIDTH / 6, WIDTH / 4.5);
evas_object_show(d.rects[2]);
evas_object_event_callback_add(
d.rects[2], EVAS_CALLBACK_MOUSE_DOWN, _on_mouse_down, NULL);
d.rects[1] = evas_object_rectangle_add(d.canvas);
evas_object_name_set(d.rects[1], "green");
evas_object_color_set(d.rects[1], 0, 255, 0, 255);
evas_object_resize(d.rects[1], WIDTH / 2.2, WIDTH / 2.2);
evas_object_move(d.rects[1], WIDTH / 2.5, WIDTH / 7);
evas_object_show(d.rects[1]);
evas_object_event_callback_add(
d.rects[1], EVAS_CALLBACK_MOUSE_DOWN, _on_mouse_down, NULL);
d.rects[0] = evas_object_rectangle_add(d.canvas);
evas_object_name_set(d.rects[0], "red");
evas_object_color_set(d.rects[0], 255, 0, 0, 255);
evas_object_resize(d.rects[0], WIDTH / 2.2, WIDTH / 2.2);
evas_object_move(d.rects[0], WIDTH / 3, WIDTH / 2.5);
evas_object_show(d.rects[0]);
evas_object_event_callback_add(
d.rects[0], EVAS_CALLBACK_MOUSE_DOWN, _on_mouse_down, NULL);
fprintf(stdout, commands);
ecore_main_loop_begin();
ecore_evas_shutdown();
return 0;
error:
fprintf(stderr, "you got to have at least one evas engine built and linked"
" up to ecore-evas for this example to run properly.\n");
return -1;
}