--- /dev/null
+/**
+ * Simple Evas example illustrating Evas smart interfaces
+ *
+ * You'll need at least one engine built for it (excluding the buffer
+ * one). See stdout/stderr for output.
+ *
+ * @verbatim
+ * gcc -o evas-smart-interface evas-smart-interface.c `pkg-config --libs --cflags evas ecore ecore-evas`
+ * @endverbatim
+ */
+
+#ifdef HAVE_CONFIG_H
+
+#include "config.h"
+#else
+
+#define PACKAGE_EXAMPLES_DIR "."
+#define __UNUSED__
+
+#endif
+
+#include <Ecore.h>
+#include <Ecore_Evas.h>
+#include <stdio.h>
+#include <errno.h>
+
+#define WIDTH (320)
+#define HEIGHT (240)
+
+static const char *commands = \
+ "commands are:\n"
+ "\tl - insert child rectangle on the left\n"
+ "\tr - insert child rectangle on the right\n"
+ "\tw - remove and delete all members from the smart object\n"
+ "\tright arrow - move smart object to the right\n"
+ "\tleft arrow - move smart object to the left\n"
+ "\tup arrow - move smart object up\n"
+ "\tdown arrow - move smart object down\n"
+ "\td - decrease smart object's size\n"
+ "\ti - increase smart object's size\n"
+ "\tc - change smart object's clipper color\n"
+ "\th - print help\n"
+ "\tq - quit\n"
+;
+
+#define WHITE {255, 255, 255, 255}
+#define RED {255, 0, 0, 255}
+#define GREEN {0, 255, 0, 255}
+#define BLUE {0, 0, 255, 255}
+
+struct test_data
+{
+ Ecore_Evas *ee;
+ Evas *evas;
+ Evas_Object *smt, *bg, *clipper, *rects[2];
+};
+
+struct color_tuple
+{
+ int r, g, b, a;
+} clipper_colors[4] = {WHITE, RED, GREEN, BLUE};
+int cur_color = 0;
+
+static const char *
+_index_to_color(int i)
+{
+ switch (i)
+ {
+ case 0:
+ return "WHITE (default)";
+
+ case 1:
+ return "RED";
+
+ case 2:
+ return "GREEN";
+
+ case 3:
+ return "BLUE";
+
+ default:
+ return "other";
+ }
+}
+
+static struct test_data d = {0};
+static const char *border_img_path = PACKAGE_EXAMPLES_DIR "/red.png";
+
+#define _evas_smart_example_type "Evas_Smart_Example"
+
+static const char iface1_data[] = "iface1_data";
+static const char IFACE1_NAME[] = "iface1";
+
+static Eina_Bool _iface1_add(Evas_Object *);
+static void _iface1_del(Evas_Object *);
+static void _iface1_custom_fn(Evas_Object *);
+
+typedef struct _Evas_Smart_Example_Interface Evas_Smart_Example_Interface;
+struct _Evas_Smart_Example_Interface
+{
+ Evas_Smart_Interface base;
+ void (*example_func)(Evas_Object *obj);
+};
+
+static Evas_Smart_Example_Interface iface1;
+
+static Eina_Bool
+_iface1_add(Evas_Object *obj)
+{
+ printf("iface1's add()!\n");
+
+ return EINA_TRUE;
+}
+
+static void
+_iface1_del(Evas_Object *obj)
+{
+ printf("iface1's del()! Data is %s\n",
+ (char *)evas_object_smart_interface_data_get
+ (obj, (Evas_Smart_Interface *)&iface1));
+}
+
+static void
+_iface1_custom_fn(Evas_Object *obj)
+{
+ printf("iface1's custom_fn()!\n");
+}
+
+static const Evas_Smart_Interface *_smart_interfaces[] =
+{
+ (Evas_Smart_Interface *)&iface1, NULL
+};
+
+#define EVT_CHILDREN_NUMBER_CHANGED "children,changed"
+
+static const Evas_Smart_Cb_Description _smart_callbacks[] =
+{
+ {EVT_CHILDREN_NUMBER_CHANGED, "i"},
+ {NULL, NULL}
+};
+
+typedef struct _Evas_Smart_Example_Data Evas_Smart_Example_Data;
+/*
+ * This structure augments clipped smart object's instance data,
+ * providing extra members required by our example smart object's
+ * implementation.
+ */
+struct _Evas_Smart_Example_Data
+{
+ Evas_Object_Smart_Clipped_Data base;
+ Evas_Object *children[2], *border;
+ int child_count;
+};
+
+#define EVAS_SMART_EXAMPLE_DATA_GET(o, ptr) \
+ Evas_Smart_Example_Data * ptr = evas_object_smart_data_get(o)
+
+#define EVAS_SMART_EXAMPLE_DATA_GET_OR_RETURN(o, ptr) \
+ EVAS_SMART_EXAMPLE_DATA_GET(o, ptr); \
+ if (!ptr) \
+ { \
+ fprintf(stderr, "No widget data for object %p (%s)!", \
+ o, evas_object_type_get(o)); \
+ fflush(stderr); \
+ abort(); \
+ return; \
+ }
+
+#define EVAS_SMART_EXAMPLE_DATA_GET_OR_RETURN_VAL(o, ptr, val) \
+ EVAS_SMART_EXAMPLE_DATA_GET(o, ptr); \
+ if (!ptr) \
+ { \
+ fprintf(stderr, "No widget data for object %p (%s)!", \
+ o, evas_object_type_get(o)); \
+ fflush(stderr); \
+ abort(); \
+ return val; \
+ }
+
+EVAS_SMART_SUBCLASS_IFACE_NEW
+ (_evas_smart_example_type, _evas_smart_example, Evas_Smart_Class,
+ Evas_Smart_Class, evas_object_smart_clipped_class_get, _smart_callbacks,
+ _smart_interfaces);
+
+static void
+_on_destroy(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(d.bg, w, h);
+}
+
+static void
+_on_child_del(void *data,
+ Evas *evas __UNUSED__,
+ Evas_Object *o,
+ void *einfo __UNUSED__)
+{
+ Evas_Object *example_smart = data;
+ long idx;
+
+ EVAS_SMART_EXAMPLE_DATA_GET(example_smart, priv);
+
+ idx = (long)evas_object_data_get(o, "index");
+ idx--;
+
+ priv->children[idx] = NULL;
+
+ evas_object_smart_member_del(o);
+ evas_object_smart_changed(example_smart);
+}
+
+static void
+_evas_smart_example_child_callbacks_unregister(Evas_Object *obj)
+{
+ evas_object_data_set(obj, "index", NULL);
+ evas_object_event_callback_del(obj, EVAS_CALLBACK_FREE, _on_child_del);
+}
+
+static void
+_evas_smart_example_child_callbacks_register(Evas_Object *o,
+ Evas_Object *child,
+ long idx)
+{
+ evas_object_event_callback_add(child, EVAS_CALLBACK_FREE, _on_child_del, o);
+ evas_object_data_set(child, "index", (void *)(++idx));
+}
+
+/* create and setup a new example smart object's internals */
+static void
+_evas_smart_example_smart_add(Evas_Object *o)
+{
+ EVAS_SMART_DATA_ALLOC(o, Evas_Smart_Example_Data);
+
+ /* this is a border around the smart object's area, delimiting it */
+ priv->border = evas_object_image_filled_add(evas_object_evas_get(o));
+ evas_object_image_file_set(priv->border, border_img_path, NULL);
+ evas_object_image_border_set(priv->border, 3, 3, 3, 3);
+ evas_object_image_border_center_fill_set(
+ priv->border, EVAS_BORDER_FILL_NONE);
+ evas_object_smart_member_add(priv->border, o);
+
+ _evas_smart_example_parent_sc->add(o);
+}
+
+static void
+_evas_smart_example_smart_del(Evas_Object *o)
+{
+ EVAS_SMART_EXAMPLE_DATA_GET(o, priv);
+
+ if (priv->children[0])
+ {
+ _evas_smart_example_child_callbacks_unregister(priv->children[0]);
+ priv->children[0] = NULL;
+ }
+
+ if (priv->children[1])
+ {
+ _evas_smart_example_child_callbacks_unregister(priv->children[1]);
+ priv->children[1] = NULL;
+ }
+
+ _evas_smart_example_parent_sc->del(o);
+}
+
+static void
+_evas_smart_example_smart_show(Evas_Object *o)
+{
+ EVAS_SMART_EXAMPLE_DATA_GET(o, priv);
+
+ if (priv->children[0]) evas_object_show(priv->children[0]);
+ if (priv->children[1]) evas_object_show(priv->children[1]);
+ evas_object_show(priv->border);
+
+ _evas_smart_example_parent_sc->show(o);
+}
+
+static void
+_evas_smart_example_smart_hide(Evas_Object *o)
+{
+ EVAS_SMART_EXAMPLE_DATA_GET(o, priv);
+
+ if (priv->children[0]) evas_object_hide(priv->children[0]);
+ if (priv->children[1]) evas_object_hide(priv->children[1]);
+ evas_object_hide(priv->border);
+
+ _evas_smart_example_parent_sc->hide(o);
+}
+
+static void
+_evas_smart_example_smart_resize(Evas_Object *o,
+ Evas_Coord w,
+ Evas_Coord h)
+{
+ Evas_Coord ow, oh;
+ evas_object_geometry_get(o, NULL, NULL, &ow, &oh);
+ if ((ow == w) && (oh == h)) return;
+
+ /* this will trigger recalculation */
+ evas_object_smart_changed(o);
+}
+
+/* act on child objects' properties, before rendering */
+static void
+_evas_smart_example_smart_calculate(Evas_Object *o)
+{
+ Evas_Coord x, y, w, h;
+
+ EVAS_SMART_EXAMPLE_DATA_GET_OR_RETURN(o, priv);
+ evas_object_geometry_get(o, &x, &y, &w, &h);
+
+ evas_object_resize(priv->border, w, h);
+ evas_object_move(priv->border, x, y);
+
+ if (priv->children[0])
+ {
+ evas_object_move(priv->children[0], x + 3, y + 3);
+ evas_object_resize(priv->children[0], (w / 2) - 3, (h / 2) - 3);
+ }
+
+ if (priv->children[1])
+ {
+ evas_object_move(priv->children[1], x + (w / 2), y + (h / 2));
+ evas_object_resize(priv->children[1], (w / 2) - 3, (h / 2) - 3);
+ }
+}
+
+/* setting our smart interface */
+static void
+_evas_smart_example_smart_set_user(Evas_Smart_Class *sc)
+{
+ /* specializing these two */
+ sc->add = _evas_smart_example_smart_add;
+ sc->del = _evas_smart_example_smart_del;
+ sc->show = _evas_smart_example_smart_show;
+ sc->hide = _evas_smart_example_smart_hide;
+
+ /* clipped smart object has no hook on resizes or calculations */
+ sc->resize = _evas_smart_example_smart_resize;
+ sc->calculate = _evas_smart_example_smart_calculate;
+}
+
+/* BEGINS example smart object's own interface */
+
+/* add a new example smart object to a canvas */
+Evas_Object *
+evas_smart_example_add(Evas *evas)
+{
+ return evas_object_smart_add(evas, _evas_smart_example_smart_class_new());
+}
+
+static void
+_evas_smart_example_remove_do(Evas_Smart_Example_Data *priv,
+ Evas_Object *child,
+ int idx)
+{
+ priv->children[idx] = NULL;
+ priv->child_count--;
+ _evas_smart_example_child_callbacks_unregister(child);
+ evas_object_smart_member_del(child);
+}
+
+/* remove a child element, return its pointer (or NULL on errors) */
+Evas_Object *
+evas_smart_example_remove(Evas_Object *o,
+ Evas_Object *child)
+{
+ long idx;
+
+ EVAS_SMART_EXAMPLE_DATA_GET_OR_RETURN_VAL(o, priv, NULL);
+
+ if (priv->children[0] != child && priv->children[1] != child)
+ {
+ fprintf(stderr, "You are trying to remove something not belonging to"
+ " the example smart object!\n");
+ return NULL;
+ }
+
+ idx = (long)evas_object_data_get(child, "index");
+ idx--;
+
+ _evas_smart_example_remove_do(priv, child, idx);
+
+ evas_object_smart_callback_call(
+ o, EVT_CHILDREN_NUMBER_CHANGED, (void *)(long)priv->child_count);
+ evas_object_smart_changed(o);
+
+ return child;
+}
+
+/* set to return any previous object set to the left position of the
+ * smart object or NULL, if any (or on errors) */
+Evas_Object *
+evas_smart_example_set_left(Evas_Object *o,
+ Evas_Object *child)
+{
+ Evas_Object *ret = NULL;
+
+ EVAS_SMART_EXAMPLE_DATA_GET_OR_RETURN_VAL(o, priv, NULL);
+ if (!child)
+ return NULL;
+
+ if (priv->children[1] == child)
+ {
+ fprintf(stderr, "You mustn't place a child on both slots of"
+ " the example smart object!\n");
+ return NULL;
+ }
+
+ if (priv->children[0])
+ {
+ if (priv->children[0] != child)
+ {
+ ret = priv->children[0];
+ _evas_smart_example_remove_do(priv, priv->children[0], 0);
+ }
+ else return child;
+ }
+
+ priv->children[0] = child;
+ _evas_smart_example_child_callbacks_register(o, child, 0);
+ evas_object_smart_member_add(child, o);
+ evas_object_smart_changed(o);
+
+ priv->child_count++;
+ if (!ret)
+ {
+ evas_object_smart_callback_call(
+ o, EVT_CHILDREN_NUMBER_CHANGED, (void *)(long)priv->child_count);
+ }
+
+ return ret;
+}
+
+/* set to return any previous object set to the right position of the
+ * smart object or NULL, if any (or on errors) */
+Evas_Object *
+evas_smart_example_set_right(Evas_Object *o,
+ Evas_Object *child)
+{
+ Evas_Object *ret = NULL;
+
+ EVAS_SMART_EXAMPLE_DATA_GET_OR_RETURN_VAL(o, priv, NULL);
+ if (!child)
+ return NULL;
+
+ if (priv->children[0] == child)
+ {
+ fprintf(stderr, "You mustn't place a child on both slots of"
+ " the example smart object!\n");
+ return NULL;
+ }
+
+ if (priv->children[1])
+ {
+ if (priv->children[1] != child)
+ {
+ ret = priv->children[1];
+ _evas_smart_example_remove_do(priv, priv->children[1], 1);
+ }
+ else return child;
+ }
+
+ priv->children[1] = child;
+ _evas_smart_example_child_callbacks_register(o, child, 1);
+ evas_object_smart_member_add(child, o);
+ evas_object_smart_changed(o);
+
+ priv->child_count++;
+ if (!ret)
+ {
+ evas_object_smart_callback_call(
+ o, EVT_CHILDREN_NUMBER_CHANGED, (void *)(long)priv->child_count);
+ }
+
+ return ret;
+}
+
+/* END OF example smart object's own interface */
+
+static void
+_on_keydown(void *data __UNUSED__,
+ Evas *evas __UNUSED__,
+ Evas_Object *o __UNUSED__,
+ void *einfo)
+{
+ Evas_Event_Key_Down *ev = einfo;
+
+ if (strcmp(ev->keyname, "q") == 0) /* print help */
+ {
+ _on_destroy(NULL);
+ return;
+ }
+
+ if (strcmp(ev->keyname, "h") == 0) /* print help */
+ {
+ fprintf(stdout, commands);
+ return;
+ }
+
+ if (strcmp(ev->keyname, "w") == 0) /* clear out smart object (WRT
+ * members) */
+ {
+ if (d.rects[0])
+ {
+ evas_smart_example_remove(d.smt, d.rects[0]);
+ evas_object_del(d.rects[0]);
+ }
+ if (d.rects[1])
+ {
+ evas_smart_example_remove(d.smt, d.rects[1]);
+ evas_object_del(d.rects[1]);
+ }
+
+ memset(d.rects, 0, sizeof(d.rects));
+
+ fprintf(stdout, "Deleting all members of the smart object.\n");
+
+ return;
+ }
+
+ if (strcmp(ev->keyname, "l") == 0) /* insert random colored
+ * rectangle on the left */
+ {
+ Evas_Object *rect = evas_object_rectangle_add(d.evas), *prev;
+ evas_object_color_set(
+ rect, rand() % 255, rand() % 255, rand() % 255, 255);
+ evas_object_show(rect);
+
+ prev = evas_smart_example_set_left(d.smt, rect);
+ d.rects[0] = rect;
+
+ fprintf(stdout, "Setting smart object's left spot with a new"
+ " rectangle.\n");
+ fprintf(stdout, "Checking its new smart object parent: %s\n",
+ evas_object_smart_parent_get(rect) == d.smt ? "OK!" :
+ "Failure!");
+ if (prev)
+ {
+ int r, g, b;
+
+ evas_object_color_get(prev, &r, &g, &b, NULL);
+ fprintf(stdout, "Deleting previous left child,"
+ " which had colors (%d, %d, %d)\n", r, g, b);
+ evas_object_del(prev);
+ }
+
+ return;
+ }
+
+ if (strcmp(ev->keyname, "r") == 0) /* insert random colored
+ * rectangle on the right */
+ {
+ Evas_Object *rect = evas_object_rectangle_add(d.evas), *prev;
+ evas_object_color_set(
+ rect, rand() % 255, rand() % 255, rand() % 255, 255);
+ evas_object_show(rect);
+
+ prev = evas_smart_example_set_right(d.smt, rect);
+ d.rects[1] = rect;
+
+ fprintf(stdout, "Setting smart object's right spot with a new"
+ " rectangle.\n");
+ fprintf(stdout, "Checking its new smart object parent: %s\n",
+ evas_object_smart_parent_get(rect) == d.smt ? "OK!" :
+ "Failure!");
+ if (prev)
+ {
+ int r, g, b;
+
+ evas_object_color_get(prev, &r, &g, &b, NULL);
+ fprintf(stdout, "Deleting previous right child,"
+ " which had colors (%d, %d, %d)\n", r, g, b);
+ evas_object_del(prev);
+ }
+
+ return;
+ }
+
+ /* move smart object along the canvas */
+ if (strcmp(ev->keyname, "Right") == 0 || strcmp(ev->keyname, "Left") == 0 ||
+ strcmp(ev->keyname, "Up") == 0 || strcmp(ev->keyname, "Down") == 0)
+ {
+ Evas_Coord x, y;
+
+ evas_object_geometry_get(d.smt, &x, &y, NULL, NULL);
+
+ switch (ev->keyname[0])
+ {
+ case 'R':
+ x += 20;
+ break;
+
+ case 'L':
+ x -= 20;
+ break;
+
+ case 'U':
+ y -= 20;
+ break;
+
+ case 'D':
+ y += 20;
+ break;
+ }
+
+ evas_object_move(d.smt, x, y);
+
+ return;
+ }
+
+ /* increase smart object's size */
+ if (strcmp(ev->keyname, "i") == 0)
+ {
+ Evas_Coord w, h;
+
+ evas_object_geometry_get(d.smt, NULL, NULL, &w, &h);
+
+ w *= 1.1;
+ h *= 1.1;
+
+ evas_object_resize(d.smt, w, h);
+
+ return;
+ }
+
+ /* decrease smart object's size */
+ if (strcmp(ev->keyname, "d") == 0)
+ {
+ Evas_Coord w, h;
+
+ evas_object_geometry_get(d.smt, NULL, NULL, &w, &h);
+
+ w *= 0.9;
+ h *= 0.9;
+
+ evas_object_resize(d.smt, w, h);
+
+ return;
+ }
+
+ /* change smart object's clipper color */
+ if (strcmp(ev->keyname, "c") == 0)
+ {
+ cur_color = (cur_color + 1) % 4;
+
+ evas_object_color_set(
+ d.clipper, clipper_colors[cur_color].r, clipper_colors[cur_color].g,
+ clipper_colors[cur_color].b, clipper_colors[cur_color].a);
+
+ fprintf(stderr, "Changing clipper's color to %s\n",
+ _index_to_color(cur_color));
+
+ return;
+ }
+}
+
+static void
+/* callback on number of member objects changed */
+_on_example_smart_object_child_num_change(void *data __UNUSED__,
+ Evas_Object *obj __UNUSED__,
+ void *event_info)
+{
+ fprintf(stdout, "Number of child members on our example smart"
+ " object changed to %lu\n", (long)event_info);
+}
+
+int
+main(void)
+{
+ const Evas_Smart_Cb_Description **descriptions;
+ Evas_Smart_Example_Interface *iface;
+ unsigned int count;
+ Eina_Bool ret;
+
+ srand(time(NULL));
+
+ 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, 10, 10, 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.evas = ecore_evas_get(d.ee);
+
+ d.bg = evas_object_rectangle_add(d.evas);
+ evas_object_color_set(d.bg, 255, 255, 255, 255);
+ evas_object_move(d.bg, 0, 0);
+ evas_object_resize(d.bg, WIDTH, HEIGHT);
+ evas_object_show(d.bg);
+
+ iface = (Evas_Smart_Example_Interface *)&iface1;
+ iface->base.name = IFACE1_NAME;
+ iface->base.private_size = sizeof(iface1_data);
+ iface->base.add = _iface1_add;
+ iface->base.del = _iface1_del;
+ iface->example_func = _iface1_custom_fn;
+
+ d.smt = evas_smart_example_add(d.evas);
+
+ evas_object_move(d.smt, WIDTH / 4, HEIGHT / 4);
+ evas_object_resize(d.smt, WIDTH / 2, HEIGHT / 2);
+ evas_object_show(d.smt);
+
+ ret = evas_object_smart_type_check(d.smt, _evas_smart_example_type);
+ fprintf(stdout, "Adding smart object of type \"%s\" to the canvas: %s.\n",
+ _evas_smart_example_type, ret ? "success" : "failure");
+
+ d.clipper = evas_object_smart_clipped_clipper_get(d.smt);
+ fprintf(stdout, "Checking if clipped smart object's clipper is a "
+ "\"static\" one: %s\n", evas_object_static_clip_get(
+ d.clipper) ? "yes" : "no");
+
+ evas_object_color_set(
+ d.clipper, clipper_colors[cur_color].r, clipper_colors[cur_color].g,
+ clipper_colors[cur_color].b, clipper_colors[cur_color].a);
+
+ evas_object_smart_callbacks_descriptions_get(
+ d.smt, &descriptions, &count, NULL, NULL);
+
+ for (; *descriptions; descriptions++)
+ {
+ fprintf(stdout, "We've found a smart callback on the smart object!"
+ "\n\tname: %s\n\ttype: %s\n", (*descriptions)->name,
+ (*descriptions)->type);
+
+ if (strcmp((*descriptions)->type, "i")) continue;
+ /* we know we don't have other types of smart callbacks
+ * here, just playing with it */
+
+ /* for now, we know the only one callback is the one
+ * reporting number of member objects changed on the
+ * example smart object */
+ evas_object_smart_callback_add(
+ d.smt, (*descriptions)->name,
+ _on_example_smart_object_child_num_change, NULL);
+ }
+
+ evas_object_focus_set(d.bg, EINA_TRUE);
+ evas_object_event_callback_add(
+ d.bg, EVAS_CALLBACK_KEY_DOWN, _on_keydown, NULL);
+
+ iface = (Evas_Smart_Example_Interface *)evas_object_smart_interface_get
+ (d.smt, IFACE1_NAME);
+ if (iface)
+ {
+ char *data;
+
+ fprintf(stdout, "We've found a smart interface on the smart object!"
+ "\n\tname: %s\n", iface->base.name);
+
+ fprintf(stdout, "Setting its interface data...\n");
+ data = evas_object_smart_interface_data_get
+ (d.smt, (Evas_Smart_Interface *)iface);
+ memcpy(data, iface1_data, sizeof(iface1_data));
+
+ fprintf(stdout, "Calling an interface's function...\n");
+ iface->example_func(d.smt);
+ }
+
+ fprintf(stdout, commands);
+ ecore_main_loop_begin();
+
+ ecore_evas_free(d.ee);
+ 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");
+ ecore_evas_shutdown();
+ return -1;
+}