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