Edje smart object是如何定义的？

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Edje_private.h:

typedef struct _Edje_Smart_Api Edje_Smart_Api;

struct _Edje_Smart_Api

{

Evas_Smart_Class base;

int version;

Eina_Bool (*file_set)(Evas_Object *obj, const char *file, const char *group);

};

/* Basic macro to init the Edje Smart API */

#define EDJE_SMART_API_INIT(smart_class_init) {smart_class_init, EDJE_SMART_API_VERSION, NULL}

#define EDJE_SMART_API_INIT_NULL EDJE_SMART_API_INIT(EVAS_SMART_CLASS_INIT_NULL)

#define EDJE_SMART_API_INIT_VERSION EDJE_SMART_API_INIT(EVAS_SMART_CLASS_INIT_VERSION)

#define EDJE_SMART_API_INIT_NAME_VERSION(name) EDJE_SMART_API_INIT(EVAS_SMART_CLASS_INIT_NAME_VERSION(name))

在edje_smart.c中开始进行定义，这里的API是私有的，公共的，将来为所有的edje object服务：

static Edje_Smart_Api _edje_smart_class = EDJE_SMART_API_INIT_NAME_VERSION("edje");

//很简单的一句话,定义这样一个结构变量

展开它：

Static Edje_Smart_Api _edje_smart_class =

{

edje, // evas smart class name

EVAS_SMART_CLASS_VERSION, //1

NULL, // add 函数初始化

NULL, // del

NULL, // move

NULL, // resize

NULL, // show

NULL, // hide

NULL, // color_set

NULL, // clip_set

NULL, // clip_unset

NULL, // calculate

NULL, // member_add

NULL, // member_del

NULL, // parent

NULL, // callbacks

NULL, // interfaces

NULL, // data

EDJE_SMART_API_VERSION, //

NULL // file_set

};

然后定义一个smart:

static Evas_Smart *_edje_smart = NULL;

这个smart 会用到上面定义的一系列的私有APIs

然后定义一个链表：这个链表很重要，在程序中定义的object, 以及EDC中自定义的所有object, 都会挂到这个链表上面。

Eina_List *_edje_edjes = NULL;

当在一个进程中，第一次调用下面这个函数时，会把前面的全局API给填充一下：

EAPI Evas_Object *

edje_object_add(Evas *evas)

{

if (!_edje_smart)

{

_edje_object_smart_set(&_edje_smart_class); //把edje自己的一组API给填充进去（参考A）

_edje_smart = evas_smart_class_new((Evas_Smart_Class *)&_edje_smart_class); //分配一块内存给_edje_smart, 同时把上面的一组API绑定给这个_edje_smart

}

return evas_object_smart_add(evas, _edje_smart); //在evas舞台上面，创建一个新的evas smart object, 同时给这个smart object赋予一定的edje自己提供的，定制的API集。

}

A: 填充好后的全局_edje_smart_class这组函数是：

_edje_smart_class =

{

edje, // evas smart class name

EVAS_SMART_CLASS_VERSION, //1

_edje_smart_add, // add 函数初始化

_edje_smart_del, // del

_edje_smart_move, // move

_edje_smart_resize, // resize

_edje_smart_show, // show

_edje_smart_hide, // hide

_edje_smart_color_set, // color_set

_edje_smart_clip_set, // clip_set

_edje_smart_clip_unset, // clip_unset

_edje_smart_calculate, // calculate

NULL, // member_add

NULL, // member_del

NULL, // parent

NULL, // callbacks

NULL, // interfaces

NULL, // data

EDJE_SMART_API_VERSION, //

_edje_smart_file_set// file_set

};

EAPI Evas_Object *

evas_object_smart_add(Evas *e, Evas_Smart *s)

{

Evas_Object *obj;

MAGIC_CHECK(e, Evas, MAGIC_EVAS);

return NULL;

MAGIC_CHECK_END();

MAGIC_CHECK(s, Evas_Smart, MAGIC_SMART);

return NULL;

MAGIC_CHECK_END();

obj = evas_object_new(e); //在evas上面创建一个object,

if (!obj) return NULL;

obj->smart.smart = s; //这个object就有灵性了: 绑定用户定制的API集，这里是edje的API集合

obj->type = s->smart_class->name; //edje

evas_object_smart_init(obj); //初始化一些数据，同时给这个object再绑定一些evas_object所提供的基础API集合：参考B

evas_object_inject(obj, e); // 把这个smart object放到Evas的layer上面

evas_object_smart_use(s);

if (s->smart_class->add) s->smart_class->add(obj); //调用edje提供的API集合中的add函数：_edje_smart_add，参考C:

return obj;

}

static const Evas_Object_Func object_func =

{

/* methods (compulsory) */

evas_object_smart_free,

evas_object_smart_render,

evas_object_smart_render_pre,

evas_object_smart_render_post,

evas_object_smart_id_get,

evas_object_smart_visual_id_get,

evas_object_smart_engine_data_get,

/* these are optional. NULL = nothing */

NULL,

NULL

};

static void

_edje_smart_add(Evas_Object *obj)

{

Edje *ed;

ed = evas_object_smart_data_get(obj);

if (!ed)

{

const Evas_Smart *smart;

const Evas_Smart_Class *sc;

ed = calloc(1, sizeof(Edje));

if (!ed) return;

smart = evas_object_smart_smart_get(obj);

sc = evas_smart_class_get(smart);

ed->api = (const Edje_Smart_Api *)sc;

evas_object_smart_data_set(obj, ed);

}

ed->evas = evas_object_evas_get(obj);

ed->clipper = evas_object_rectangle_add(ed->evas);

evas_object_static_clip_set(ed->clipper, 1);

evas_object_smart_member_add(ed->clipper, obj);

evas_object_color_set(ed->clipper, 255, 255, 255, 255);

evas_object_move(ed->clipper, -10000, -10000);

evas_object_resize(ed->clipper, 20000, 20000);

evas_object_pass_events_set(ed->clipper, 1);

ed->have_objects = 1;

ed->references = 1;

evas_object_geometry_get(obj, &(ed->x), &(ed->y), &(ed->w), &(ed->h));

ed->obj = obj;

_edje_edjes = eina_list_append(_edje_edjes, obj); //把evas smart object: edje放到一个全局链表中保持;

{

Eina_List *l;

const void *data;

printf("--- EDJE DUMP [%i]/n", eina_list_count(_edje_edjes));

EINA_LIST_FOREACH(_edge_edges, l, data)

{

ed = _edje_fetch(data);

printf("EDJE: %80s | %80s/n", ed->path, ed->part);

}

printf("--- EDJE DUMP [%i]/n", eina_list_count(_edje_edjes));

}