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evas-smart-object.c
#ifdef HAVE_CONFIG_H
#include "config.h"
#else
#define PACKAGE_EXAMPLES_DIR "."
#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"
"\t. - rotate object to the right\n"
"\t, - rotate object to the left\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;
int cur_angle = 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"
#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_NEW(_evas_smart_example_type, _evas_smart_example,
Evas_Smart_Class, Evas_Smart_Class,
evas_object_smart_clipped_class_get, _smart_callbacks);
static void
_on_destroy(Ecore_Evas *ee EINA_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 EINA_UNUSED,
Evas_Object *o,
void *einfo EINA_UNUSED)
{
Evas_Object *example_smart = data;
long idx;
EVAS_SMART_EXAMPLE_DATA_GET(example_smart, priv);
idx = (long)(uintptr_t)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 *)(uintptr_t)(++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);
/* call parent_sc->add() before member_adding the children, otherwise the
* smart object's clipper won't be created yet, and the children won't be
* clipped to it */
_evas_smart_example_parent_sc->add(o);
/* 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_show(priv->border);
evas_object_smart_member_add(priv->border, 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_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;
/* 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)(uintptr_t)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 *)(uintptr_t)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 *)(uintptr_t)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 *)(uintptr_t)priv->child_count);
}
return ret;
}
/* END OF example smart object's own interface */
static void
_map_update(void)
{
Evas_Map *m;
Evas_Coord x, y, w, h;
evas_object_geometry_get(d.smt, &x, &y, &w, &h);
m = evas_map_new(4);
evas_map_util_points_populate_from_object(m, d.smt);
evas_map_util_rotate(m, cur_angle, x + (w / 2), y + (h / 2));
evas_object_map_set(d.smt, m);
evas_object_map_enable_set(d.smt, EINA_TRUE);
evas_map_free(m);
}
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;
if (strcmp(ev->key, "q") == 0) /* print help */
{
_on_destroy(NULL);
return;
}
if (strcmp(ev->key, "h") == 0) /* print help */
{
fprintf(stdout, commands);
return;
}
if (strcmp(ev->key, "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->key, "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->key, "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->key, "Right") == 0 || strcmp(ev->key, "Left") == 0 ||
strcmp(ev->key, "Up") == 0 || strcmp(ev->key, "Down") == 0)
{
Evas_Coord x, y;
evas_object_geometry_get(d.smt, &x, &y, NULL, NULL);
switch (ev->key[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);
_map_update();
return;
}
/* increase smart object's size */
if (strcmp(ev->key, "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);
_map_update();
return;
}
/* decrease smart object's size */
if (strcmp(ev->key, "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);
_map_update();
return;
}
/* change smart object's clipper color */
if (strcmp(ev->key, "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;
}
/* rotate object to the right */
if (strcmp(ev->key, "period") == 0)
{
cur_angle = (cur_angle + 30) % 360;
_map_update();
return;
}
if (strcmp(ev->key, "comma") == 0)
{
cur_angle = (cur_angle - 30) % 360;
_map_update();
return;
}
fprintf(stderr, "Invalid key: '%s'\n", ev->key);
}
static void
/* callback on number of member objects changed */
_on_example_smart_object_child_num_change(void *data EINA_UNUSED,
Evas_Object *obj EINA_UNUSED,
void *event_info)
{
fprintf(stdout, "Number of child members on our example smart"
" object changed to %llu\n", (unsigned long long)(uintptr_t)event_info);
}
int
main(void)
{
const Evas_Smart_Cb_Description **descriptions;
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);
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);
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;
}