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e_flowlayout.c

/*
 * vim:ts=8:sw=3:sts=8:noexpandtab:cino=>5n-3f0^-2{2
 */
#include "e.h"

typedef struct _E_Smart_Data E_Smart_Data;
typedef struct _E_Flowlayout_Item   E_Flowlayout_Item;

struct _E_Smart_Data
{ 
   Evas_Coord       x, y, w, h;
   Evas_Object     *obj;
   Evas_Object     *clip;
   int              frozen;
   unsigned char    changed : 1;
   unsigned char    horizontal : 1;
   unsigned char    homogenous : 1;
   unsigned char    fill : 1;
   unsigned char    flowright : 1;
   unsigned char    flowbottom : 1;
   Evas_List       *items;
   struct {
      Evas_Coord    w, h;
   } min, max;
   struct {
      double        x, y;
   } align;
   int rows;
   int cols;
}; 

struct _E_Flowlayout_Item
{
   E_Smart_Data    *sd;
   unsigned char    fill_w : 1;
   unsigned char    fill_h : 1;
   unsigned char    expand_w : 1;
   unsigned char    expand_h : 1;
   struct {
      Evas_Coord    w, h;
   } min, max;
   struct {
      double        x, y;
   } align;
   Evas_Object     *obj;
};

/* local subsystem functions */
static E_Flowlayout_Item *_e_flowlayout_smart_adopt(E_Smart_Data *sd, Evas_Object *obj);
static void        _e_flowlayout_smart_disown(Evas_Object *obj);
static void        _e_flowlayout_smart_item_del_hook(void *data, Evas *e, Evas_Object *obj, void *event_info);
static void        _e_flowlayout_smart_reconfigure(E_Smart_Data *sd);
static void        _e_flowlayout_smart_extents_calcuate(E_Smart_Data *sd);

static void _e_flowlayout_smart_init(void);
static void _e_flowlayout_smart_add(Evas_Object *obj);
static void _e_flowlayout_smart_del(Evas_Object *obj);
static void _e_flowlayout_smart_move(Evas_Object *obj, Evas_Coord x, Evas_Coord y);
static void _e_flowlayout_smart_resize(Evas_Object *obj, Evas_Coord w, Evas_Coord h);
static void _e_flowlayout_smart_show(Evas_Object *obj);
static void _e_flowlayout_smart_hide(Evas_Object *obj);
static void _e_flowlayout_smart_color_set(Evas_Object *obj, int r, int g, int b, int a);
static void _e_flowlayout_smart_clip_set(Evas_Object *obj, Evas_Object *clip);
static void _e_flowlayout_smart_clip_unset(Evas_Object *obj);

/* local subsystem globals */
static Evas_Smart *_e_smart = NULL;

/* externally accessible functions */
EAPI Evas_Object *
e_flowlayout_add(Evas *evas)
{
   _e_flowlayout_smart_init();
   return evas_object_smart_add(evas, _e_smart);
}

EAPI int
e_flowlayout_freeze(Evas_Object *obj)
{
   E_Smart_Data *sd;
   
   sd = evas_object_smart_data_get(obj);
   if (!sd) return 0;
   sd->frozen++;
   return sd->frozen;
}

EAPI int
e_flowlayout_thaw(Evas_Object *obj)
{
   E_Smart_Data *sd;
   
   sd = evas_object_smart_data_get(obj);
   if (!sd) return 0;
   sd->frozen--;
   if (sd->frozen <= 0) _e_flowlayout_smart_reconfigure(sd);
   return sd->frozen;
}

EAPI void
e_flowlayout_orientation_set(Evas_Object *obj, int horizontal)
{
   E_Smart_Data *sd;
   
   sd = evas_object_smart_data_get(obj);
   if (!sd) return;
   if (((sd->horizontal) && (horizontal)) ||
       ((!sd->horizontal) && (!horizontal))) return;
   sd->horizontal = horizontal;
   sd->changed = 1;
   if (sd->frozen <= 0) _e_flowlayout_smart_reconfigure(sd);
}

EAPI int
e_flowlayout_orientation_get(Evas_Object *obj)
{
   E_Smart_Data *sd;
   
   sd = evas_object_smart_data_get(obj);
   if (!sd) return 0;
   return sd->horizontal;
}

EAPI void
e_flowlayout_flowdirection_set(Evas_Object *obj, int right, int bottom)
{
   E_Smart_Data *sd;
   
   sd = evas_object_smart_data_get(obj);
   if (!sd) return;
   if ((((sd->flowbottom) && (bottom)) ||
       ((!sd->flowbottom) && (!bottom))) &&
       (((sd->flowright)  && (right))  ||
       ((!sd->flowright)  && (!right))))  return;
   sd->flowright = right;
   sd->flowbottom = bottom;
   sd->changed = 1;
   if (sd->frozen <= 0) _e_flowlayout_smart_reconfigure(sd);
}

EAPI void
e_flowlayout_flowdirection_get(Evas_Object *obj, int *right, int *bottom)
{
   E_Smart_Data *sd;
   
   sd = evas_object_smart_data_get(obj);
   if (!sd) return;
   if (right) *right = sd->flowright;
   if (bottom) *bottom = sd->flowright; 
}

EAPI void
e_flowlayout_homogenous_set(Evas_Object *obj, int homogenous)
{
   E_Smart_Data *sd;
  
   sd = evas_object_smart_data_get(obj);
   if (!sd) return;
   if (sd->homogenous == homogenous) return;
   sd->homogenous = homogenous;
   sd->changed = 1;
   if (sd->frozen <= 0) _e_flowlayout_smart_reconfigure(sd);
}

EAPI int
e_flowlayout_homogenous_get(Evas_Object *obj)
{
   E_Smart_Data *sd;
   
   sd = evas_object_smart_data_get(obj);
   if (!sd) return 0;
   return sd->homogenous;
}

EAPI void
e_flowlayout_fill_set(Evas_Object *obj, int fill)
{
   E_Smart_Data *sd;
  
   sd = evas_object_smart_data_get(obj);
   if (!sd) return;
   if (sd->fill == fill) return;
   sd->fill = fill;
   sd->changed = 1;
   if (sd->frozen <= 0) _e_flowlayout_smart_reconfigure(sd);
}

EAPI int
e_flowlayout_fill_get(Evas_Object *obj)
{
   E_Smart_Data *sd;
   
   sd = evas_object_smart_data_get(obj);
   if (!sd) return 0;
   return sd->fill;
}


EAPI int
e_flowlayout_pack_start(Evas_Object *obj, Evas_Object *child)
{
   E_Smart_Data *sd;
   
   sd = evas_object_smart_data_get(obj);
   if (!sd) return 0;
   _e_flowlayout_smart_adopt(sd, child);
   sd->items = evas_list_prepend(sd->items, child);
   sd->changed = 1;
   if (sd->frozen <= 0) _e_flowlayout_smart_reconfigure(sd);
   return 0;
}

EAPI int
e_flowlayout_pack_end(Evas_Object *obj, Evas_Object *child)
{
   E_Smart_Data *sd;
   
   sd = evas_object_smart_data_get(obj);
   if (!sd) return 0;
   _e_flowlayout_smart_adopt(sd, child);
   sd->items = evas_list_append(sd->items, child);   
   sd->changed = 1;
   if (sd->frozen <= 0) _e_flowlayout_smart_reconfigure(sd);
   return evas_list_count(sd->items) - 1;
}

EAPI int
e_flowlayout_pack_before(Evas_Object *obj, Evas_Object *child, Evas_Object *before)
{
   E_Smart_Data *sd;
   int i = 0;
   Evas_List *l;
   
   sd = evas_object_smart_data_get(obj);
   if (!sd) return 0;
   _e_flowlayout_smart_adopt(sd, child);
   sd->items = evas_list_prepend_relative(sd->items, child, before);
   for (i = 0, l = sd->items; l; l = l->next, i++)
     {
      if (l->data == child) break;
     }
   sd->changed = 1;
   if (sd->frozen <= 0) _e_flowlayout_smart_reconfigure(sd);
   return i;
}

EAPI int
e_flowlayout_pack_after(Evas_Object *obj, Evas_Object *child, Evas_Object *after)
{
   E_Smart_Data *sd;
   int i = 0;
   Evas_List *l;
   
   sd = evas_object_smart_data_get(obj);
   if (!sd) return 0;
   _e_flowlayout_smart_adopt(sd, child);
   sd->items = evas_list_append_relative(sd->items, child, after);
   for (i = 0, l = sd->items; l; l = l->next, i++)
     {
      if (l->data == child) break;
     }
   sd->changed = 1;
   if (sd->frozen <= 0) _e_flowlayout_smart_reconfigure(sd);
   return i;
}

EAPI int
e_flowlayout_pack_count_get(Evas_Object *obj)
{
   E_Smart_Data *sd;
   
   sd = evas_object_smart_data_get(obj);
   if (!sd) return 0;
   return evas_list_count(sd->items);
}

EAPI Evas_Object *
e_flowlayout_pack_object_nth(Evas_Object *obj, int n)
{
   E_Smart_Data *sd;
   
   sd = evas_object_smart_data_get(obj);
   if (!sd) return NULL;
   return evas_list_nth(sd->items, n);
}

EAPI Evas_Object *
e_flowlayout_pack_object_first(Evas_Object *obj)
{
   E_Smart_Data *sd;
   
   sd = evas_object_smart_data_get(obj);
   if (!sd) return NULL;
   return evas_list_data(sd->items);
}

EAPI Evas_Object *
e_flowlayout_pack_object_last(Evas_Object *obj)
{
   E_Smart_Data *sd;
   
   sd = evas_object_smart_data_get(obj);
   if (!sd) return NULL;
   return evas_list_data(evas_list_last(sd->items));
}

EAPI void
e_flowlayout_pack_options_set(Evas_Object *obj, int fill_w, int fill_h, int expand_w, int expand_h, double align_x, double align_y, Evas_Coord min_w, Evas_Coord min_h, Evas_Coord max_w, Evas_Coord max_h)
{
   E_Flowlayout_Item *bi;
   
   bi = evas_object_data_get(obj, "e_flowlayout_data");
   if (!bi) return;
   bi->fill_w = fill_w;
   bi->fill_h = fill_h;
   bi->expand_w = expand_w;
   bi->expand_h = expand_h;
   bi->align.x = align_x;
   bi->align.y = align_y;
   bi->min.w = min_w;
   bi->min.h = min_h;
   bi->max.w = max_w;
   bi->max.h = max_h;
   bi->sd->changed = 1;
   if (bi->sd->frozen <= 0) _e_flowlayout_smart_reconfigure(bi->sd);
}

EAPI void
e_flowlayout_unpack(Evas_Object *obj)
{
   E_Flowlayout_Item *bi;
   E_Smart_Data *sd;
   
   bi = evas_object_data_get(obj, "e_flowlayout_data");
   if (!bi) return;
   sd = bi->sd;
   if (!sd) return;
   sd->items = evas_list_remove(sd->items, obj);
   _e_flowlayout_smart_disown(obj);
   sd->changed = 1;
   if (sd->frozen <= 0) _e_flowlayout_smart_reconfigure(sd);
}

EAPI void
e_flowlayout_min_size_get(Evas_Object *obj, Evas_Coord *minw, Evas_Coord *minh)
{
   E_Smart_Data *sd;
   
   sd = evas_object_smart_data_get(obj);
   if (!sd) return;
   if (sd->changed) _e_flowlayout_smart_extents_calcuate(sd);
   if (minw) *minw = sd->min.w;
   if (minh) *minh = sd->min.h;
}

EAPI void
e_flowlayout_max_size_get(Evas_Object *obj, Evas_Coord *maxw, Evas_Coord *maxh)
{
   E_Smart_Data *sd;
   
   sd = evas_object_smart_data_get(obj);
   if (!sd) return;
   if (sd->changed) _e_flowlayout_smart_extents_calcuate(sd);
   if (maxw) *maxw = sd->max.w;
   if (maxh) *maxh = sd->max.h;
}

EAPI int
e_flowlayout_max_children(Evas_Object *obj)
{
   E_Smart_Data *sd;
   
   sd = evas_object_smart_data_get(obj);
   if (!sd) return -1;
   if (!sd->homogenous) return -1;
   return (sd->rows * sd->cols);
}
EAPI void
e_flowlayout_align_get(Evas_Object *obj, double *ax, double *ay)
{
   E_Smart_Data *sd;
   
   sd = evas_object_smart_data_get(obj);
   if (!sd) return;
   if (ax) *ax = sd->align.x;
   if (ay) *ay = sd->align.y;
}

EAPI void
e_flowlayout_align_set(Evas_Object *obj, double ax, double ay)
{
   E_Smart_Data *sd;
   
   sd = evas_object_smart_data_get(obj);
   if (!sd) return;
   if ((sd->align.x == ax) && (sd->align.y == ay)) return;
   sd->align.x = ax;
   sd->align.y = ay;
   sd->changed = 1;
   if (sd->frozen <= 0) _e_flowlayout_smart_reconfigure(sd);
}

/* local subsystem functions */
static E_Flowlayout_Item *
_e_flowlayout_smart_adopt(E_Smart_Data *sd, Evas_Object *obj)
{
   E_Flowlayout_Item *bi;
   
   bi = calloc(1, sizeof(E_Flowlayout_Item));
   if (!bi) return NULL;
   bi->sd = sd;
   bi->obj = obj;
   /* defaults */
   bi->fill_w = 0;
   bi->fill_h = 0;
   bi->expand_w = 0;
   bi->expand_h = 0;
   bi->align.x = 0.5;
   bi->align.y = 0.5;
   bi->min.w = 0;
   bi->min.h = 0;
   bi->max.w = 0;
   bi->max.h = 0;
   evas_object_clip_set(obj, sd->clip);
   evas_object_smart_member_add(obj, bi->sd->obj);
   evas_object_data_set(obj, "e_flowlayout_data", bi);
   evas_object_event_callback_add(obj, EVAS_CALLBACK_FREE,
                          _e_flowlayout_smart_item_del_hook, NULL);
   if ((!evas_object_visible_get(sd->clip)) &&
       (evas_object_visible_get(sd->obj)))
     evas_object_show(sd->clip);
   return bi;
}

static void
_e_flowlayout_smart_disown(Evas_Object *obj)
{
   E_Flowlayout_Item *bi;
   
   bi = evas_object_data_get(obj, "e_flowlayout_data");
   if (!bi) return;
   if (!bi->sd->items)
     {
      if (evas_object_visible_get(bi->sd->clip))
        evas_object_hide(bi->sd->clip);
     }
   evas_object_event_callback_del(obj,
                          EVAS_CALLBACK_FREE,
                          _e_flowlayout_smart_item_del_hook);
   evas_object_smart_member_del(obj);
   evas_object_clip_unset(obj);
   evas_object_data_del(obj, "e_flowlayout_data");
   free(bi);
}

static void
_e_flowlayout_smart_item_del_hook(void *data, Evas *e, Evas_Object *obj, void *event_info)
{
   e_flowlayout_unpack(obj);
}

static void
_e_flowlayout_smart_reconfigure(E_Smart_Data *sd)
{
   Evas_Coord x, y, w, h, xx, yy, cr, cc;
   Evas_List *l;
   int minw, minh, wdif, hdif;
   int count, expand;


   if (!sd->changed) return;
   
   /* local variables */
   x = sd->x;
   y = sd->y;
   w = sd->w;
   h = sd->h;

   /* Calculate extents */
   _e_flowlayout_smart_extents_calcuate(sd);
   minw = sd->min.w;
   minh = sd->min.h;
   count = evas_list_count(sd->items);
   expand = 0;

   /* Too small? move a little */
   if (w < minw)
     {
      x = x + ((w - minw) * (1.0 - sd->align.x));
      w = minw;
     }
   if (h < minh)
     {
      y = y + ((h - minh) * (1.0 - sd->align.y));
      h = minh;
     }

   /* Some odd expanding counter */
   for (l = sd->items; l; l = l->next)
     {
      E_Flowlayout_Item *bi;
      Evas_Object *obj;
      
      obj = l->data;
      bi = evas_object_data_get(obj, "e_flowlayout_data");
      if (bi)
        {
           if (sd->horizontal)
             {
              if (bi->expand_w) expand++;
             }
           else
             {
              if (bi->expand_h) expand++;
             }
        }
     }

   /* If no expansion, w is minw, h is minh */
   if (expand == 0)
     {
      if (sd->horizontal)
        {
           x += (double)(w - minw) * sd->align.x;
           w = minw;
        }
      else
        {
           y += (double)(h - minh) * sd->align.y;
           h = minh;
        }
     }
   
   /* Some calculations */
   wdif = w - minw;
   hdif = h - minh;
   if (sd->flowright)
     xx = x;
   else
     xx = x + w;
   if (sd->flowbottom)
     yy = y;
   else
     yy = y + h;
   cr = 0;
   cc = 0;

   /* Now for the real deal */
   for (l = sd->items; l; l = l->next)
     {
      E_Flowlayout_Item *bi;
      Evas_Object *obj;
      
      obj = l->data;
      bi = evas_object_data_get(obj, "e_flowlayout_data");
      if (bi)
        {
           /* Horiziontal */
           if (sd->horizontal)
             {
              /* Homogenous */
              if (sd->homogenous)
                {
                   Evas_Coord ww, hh, ow, oh;
                   ww = w / sd->cols;
                   hh = h / sd->rows;
                   if (sd->fill)
                   {
                      int num = count - (cr)*(sd->cols);
                      if (num < sd->cols)
                        {
                         ww = w / num;
                        }
                   }
                   ow = bi->min.w;
                   if (bi->fill_w) ow = ww;
                   if ((bi->max.w >= 0) && (bi->max.w < ow)) ow = bi->max.w;
                   oh = bi->min.h;
                   if (bi->fill_h) oh = hh;
                   if ((bi->max.h >= 0) && (bi->max.h < oh)) oh = bi->max.h;
                   if (sd->flowright)
                   {
                      if (sd->flowbottom)
                        {
                         evas_object_move(obj, 
                              xx + (Evas_Coord)(((double)(ww - ow)) * bi->align.x),
                              yy + (Evas_Coord)(((double)(hh - oh)) * bi->align.y));
                        }
                      else
                        {
                         evas_object_move(obj, 
                              xx + (Evas_Coord)(((double)(ww - ow)) * bi->align.x),
                              yy - hh + (Evas_Coord)(((double)(hh - oh)) * bi->align.y));
                        }
                      evas_object_resize(obj, ow, oh);
                      xx += ww;
                   }
                   else
                   {
                      if (sd->flowbottom)
                        {
                         evas_object_move(obj, 
                              xx - ww + (Evas_Coord)(((double)(ww - ow)) * bi->align.x),
                              yy + (Evas_Coord)(((double)(hh - oh)) * bi->align.y));
                        }
                      else
                        {
                         evas_object_move(obj, 
                              xx - ww + (Evas_Coord)(((double)(ww - ow)) * bi->align.x),
                              yy - hh + (Evas_Coord)(((double)(hh - oh)) * bi->align.y));

                        }
                      evas_object_resize(obj, ow, oh);
                      xx -= ww;
                   }
                   cc++;
                   if (cc >= sd->cols)
                   {
                      cc = 0;
                      cr++;
                      if (sd->flowright)
                        xx = x;
                      else
                        xx = x + w;
                      if (sd->flowbottom)
                        yy += hh;
                      else
                        yy -= hh;
                   }
                }
              /* TODO Nonhomogenous Horizontal */
              else
                {
                }
             }
           /* Vertical */
           else
             {
              if (sd->homogenous)
                {
                   Evas_Coord ww, hh, ow, oh;
                   ww = w / sd->cols;
                   hh = h / sd->rows;
                   if (sd->fill)
                   {
                      int num = count - (cc)*(sd->rows);
                      if (num < sd->rows)
                        {
                         hh = h / num;
                        }
                   }
                   oh = bi->min.h;
                   if (bi->fill_h) oh = hh;
                   if ((bi->max.h >= 0) && (bi->max.h < oh)) oh = bi->max.h;
                   ow = bi->min.w;
                   if (bi->fill_w) ow = ww;
                   if ((bi->max.w >= 0) && (bi->max.w < ow)) ow = bi->max.w;
                   if (sd->flowbottom)
                   {
                      if (sd->flowright)
                        {
                         evas_object_move(obj, 
                              xx + (Evas_Coord)(((double)(ww - ow)) * bi->align.x),
                              yy + (Evas_Coord)(((double)(hh - oh)) * bi->align.y));
                        }
                      else
                        {
                         evas_object_move(obj, 
                              xx - ww + (Evas_Coord)(((double)(ww - ow)) * bi->align.x),
                              yy + (Evas_Coord)(((double)(hh - oh)) * bi->align.y));
                        }
                      evas_object_resize(obj, ow, oh);
                      yy += hh;
                   }
                   else
                   {
                      if (sd->flowright)
                        {
                         evas_object_move(obj, 
                              xx + (Evas_Coord)(((double)(ww - ow)) * bi->align.x),
                              yy - hh + (Evas_Coord)(((double)(hh - oh)) * bi->align.y));
                        }
                      else
                        {
                         evas_object_move(obj, 
                              xx - ww + (Evas_Coord)(((double)(ww - ow)) * bi->align.x),
                              yy - hh + (Evas_Coord)(((double)(hh - oh)) * bi->align.y));

                        }
                      evas_object_resize(obj, ow, oh);
                      yy -= hh;
                   }
                   cr++;
                   if (cr >= sd->rows)
                   {
                      cr = 0;
                      cc++;
                      if (sd->flowbottom)
                        yy = y;
                      else
                        yy = y + h;
                      if (sd->flowright)
                        xx += ww;
                      else
                        xx -= ww;
                   }

                }
              /* TODO Nonhomogeneous Vertical */
              else
                {
                }
             }
        }
     }
   sd->changed = 0;
}

static void
_e_flowlayout_smart_extents_calcuate(E_Smart_Data *sd)
{
   Evas_List *l;
   int minw, minh, count;

   /* FIXME: need to calc max */
   sd->max.w = -1; /* max < 0 == unlimited */
   sd->max.h = -1;
   
   minw = 1;
   minh = 1;
   if (sd->homogenous)
     {
      for (l = sd->items; l; l = l->next)
        {
           E_Flowlayout_Item *bi;
           Evas_Object *obj;
           
           obj = l->data;
           bi = evas_object_data_get(obj, "e_flowlayout_data");   
           if (bi)
             {
              if (sd->horizontal)
                {
                   if (minh < bi->min.h) minh = bi->min.h;
                   if (minw < bi->min.w) minw = bi->min.w;
                }
              else
                {
                   if (minw < bi->min.w) minw = bi->min.w;
                   if (minh < bi->min.h) minh = bi->min.h;
                }
             }
        }
      if (sd->horizontal)
        {
           sd->rows = sd->h/minh;
           if (sd->rows<1)
             sd->rows = 1;
           count = evas_list_count(sd->items);
           sd->cols = sd->w/minw;
        }
      else
        {
           sd->cols = sd->w/minw;
           if (sd->cols<1)
             sd->cols = 1;
           count = evas_list_count(sd->items);
           sd->rows = sd->h/minh;
        }

      minw *= sd->cols;
      minh *= sd->rows;
     }
   /* TODO nonhomogenous */
   else
     {
      for (l = sd->items; l; l = l->next)
        {
           E_Flowlayout_Item *bi;
           Evas_Object *obj;
           
           obj = l->data;
           bi = evas_object_data_get(obj, "e_flowlayout_data");
           if (bi)
             {
              if (sd->horizontal)
                {
                   if (minh < bi->min.h) minh = bi->min.h*sd->rows;
                   minw += bi->min.w;
                }
              else
                {
                   if (minw < bi->min.w) minw = bi->min.w*sd->cols;
                   minh += bi->min.h;
                }
             }
        }
       if (sd->horizontal)
         {
            sd->rows = sd->h/minh;
            minh *= sd->rows;
            sd->cols = -1;
            minw = minw/sd->cols + 0.2*minw;
         }
       else
         {
            sd->cols = sd->w/minw;
            minw *= sd->cols;
            sd->rows = -1;
            minh = minh/sd->cols + 0.2*minh;
         }
     }
   sd->min.w = minw;
   sd->min.h = minh;
   if (sd->rows < 1)
     sd->rows = 1;
   if (sd->cols < 1)
     sd->cols = 1;
}

static void
_e_flowlayout_smart_init(void)
{
   if (_e_smart) return;
     {
      static const Evas_Smart_Class sc =
        {
           "e_flowlayout",
             EVAS_SMART_CLASS_VERSION,
             _e_flowlayout_smart_add,
             _e_flowlayout_smart_del,
             _e_flowlayout_smart_move,
             _e_flowlayout_smart_resize,
             _e_flowlayout_smart_show,
             _e_flowlayout_smart_hide,
             _e_flowlayout_smart_color_set,
             _e_flowlayout_smart_clip_set,
             _e_flowlayout_smart_clip_unset,
             NULL
        };
        _e_smart = evas_smart_class_new(&sc);
     }
}

static void
_e_flowlayout_smart_add(Evas_Object *obj)
{
   E_Smart_Data *sd;
   
   sd = calloc(1, sizeof(E_Smart_Data));
   if (!sd) return;
   sd->obj = obj;
   sd->x = 0;
   sd->y = 0;
   sd->w = 0;
   sd->h = 0;
   sd->align.x = 0.5;
   sd->align.y = 0.5;
   sd->clip = evas_object_rectangle_add(evas_object_evas_get(obj));
   evas_object_smart_member_add(sd->clip, obj);
   evas_object_move(sd->clip, -100004, -100004);
   evas_object_resize(sd->clip, 200008, 200008);
   evas_object_color_set(sd->clip, 255, 255, 255, 255);
   evas_object_smart_data_set(obj, sd);
}
   
static void
_e_flowlayout_smart_del(Evas_Object *obj)
{
   E_Smart_Data *sd;
   
   sd = evas_object_smart_data_get(obj);
   if (!sd) return;
   /* FIXME: this gets into an infinite loop when changin basic->advanced on
    * ibar config dialog
    */
   while (sd->items)
     {
      Evas_Object *child;
      
      child = sd->items->data;
      e_flowlayout_unpack(child);
     }
   evas_object_del(sd->clip);
   free(sd);
}

static void
_e_flowlayout_smart_move(Evas_Object *obj, Evas_Coord x, Evas_Coord y)
{
   E_Smart_Data *sd;
   
   sd = evas_object_smart_data_get(obj);
   if (!sd) return;
   if ((x == sd->x) && (y == sd->y)) return;
     {
      Evas_List *l;
      Evas_Coord dx, dy;
      
      dx = x - sd->x;
      dy = y - sd->y;
      for (l = sd->items; l; l = l->next)
        {
           Evas_Coord ox, oy;
           
           evas_object_geometry_get(l->data, &ox, &oy, NULL, NULL);
           evas_object_move(l->data, ox + dx, oy + dy);
        }
     }
   sd->x = x;
   sd->y = y;
}

static void
_e_flowlayout_smart_resize(Evas_Object *obj, Evas_Coord w, Evas_Coord h)
{
   E_Smart_Data *sd;
   
   sd = evas_object_smart_data_get(obj);
   if (!sd) return;
   if ((w == sd->w) && (h == sd->h)) return;
   sd->w = w;
   sd->h = h;
   sd->changed = 1;
   _e_flowlayout_smart_reconfigure(sd);
}

static void
_e_flowlayout_smart_show(Evas_Object *obj)
{
   E_Smart_Data *sd;
   
   sd = evas_object_smart_data_get(obj);
   if (!sd) return;
   if (sd->items) evas_object_show(sd->clip);
}

static void
_e_flowlayout_smart_hide(Evas_Object *obj)
{
   E_Smart_Data *sd;
   
   sd = evas_object_smart_data_get(obj);
   if (!sd) return;
   evas_object_hide(sd->clip);
}

static void
_e_flowlayout_smart_color_set(Evas_Object *obj, int r, int g, int b, int a)
{
   E_Smart_Data *sd;
   
   sd = evas_object_smart_data_get(obj);
   if (!sd) return;   
   evas_object_color_set(sd->clip, r, g, b, a);
}

static void
_e_flowlayout_smart_clip_set(Evas_Object *obj, Evas_Object *clip)
{
   E_Smart_Data *sd;
   
   sd = evas_object_smart_data_get(obj);
   if (!sd) return;
   evas_object_clip_set(sd->clip, clip);
}

static void
_e_flowlayout_smart_clip_unset(Evas_Object *obj)
{
   E_Smart_Data *sd;
   
   sd = evas_object_smart_data_get(obj);
   if (!sd) return;
   evas_object_clip_unset(sd->clip);
}  

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