================================================================
[framework/uifw/elementary.git] / src / lib / elm_hover.c
old mode 100755 (executable)
new mode 100644 (file)
index 5f98472..d6efcca
@@ -5,28 +5,60 @@
  * @defgroup Hover Hover
  * @ingroup Elementary
  *
- * A Hover object will over over the @p Parent object at the @p Target
- * location.  Anything in the background will be given a darker coloring
- * to indicate that the hover object is on top.
+ * A Hover object will over its @p parent object at the @p target
+ * location. Anything in the background will be given a darker
+ * coloring to indicate that the hover object is on top (at the
+ * default theme).
  *
- * NOTE: The hover object will take up the entire space of @p Target object.
+ * @note The hover object will take up the entire space of @p target
+ * object.
  */
 
 typedef struct _Widget_Data Widget_Data;
-typedef struct _Subinfo Subinfo;
+typedef struct _Content_Info Content_Info;
+
+#ifndef MAX
+# define MAX(a, b) (((a) > (b)) ? (a) : (b))
+#endif
+
+#define ELM_HOVER_PARTS_FOREACH unsigned int i = 0; \
+  for (i = 0; i < sizeof(wd->subs) / sizeof(wd->subs[0]); i++)
+
+static const char *_directions[] = {
+  "left",
+  "top-left",
+  "top",
+  "top-right",
+  "right",
+  "bottom-right",
+  "bottom",
+  "bottom-left",
+  "middle"
+};
+
+#define _HOV_LEFT (_directions[0])
+#define _HOV_TOP_LEFT (_directions[1])
+#define _HOV_TOP (_directions[2])
+#define _HOV_TOP_RIGHT (_directions[2])
+#define _HOV_RIGHT (_directions[4])
+#define _HOV_BOTTOM_RIGHT (_directions[5])
+#define _HOV_BOTTOM (_directions[6])
+#define _HOV_BOTTOM_LEFT (_directions[7])
+#define _HOV_MIDDLE (_directions[8])
+
+struct _Content_Info
+{
+   const char *swallow;
+   Evas_Object *obj;
+};
 
 struct _Widget_Data
 {
    Evas_Object *hov, *cov;
    Evas_Object *offset, *size;
    Evas_Object *parent, *target;
-   Eina_List *subs;
-};
-
-struct _Subinfo
-{
-   const char *swallow;
-   Evas_Object *obj;
+   Evas_Object *smt_sub;
+   Content_Info subs[sizeof(_directions)/sizeof(_directions[0])];
 };
 
 static const char *widtype = NULL;
@@ -41,27 +73,33 @@ static void _hov_move(void *data, Evas *e, Evas_Object *obj, void *event_info);
 static void _hov_resize(void *data, Evas *e, Evas_Object *obj, void *event_info);
 static void _hov_show(void *data, Evas *e, Evas_Object *obj, void *event_info);
 static void _hov_hide(void *data, Evas *e, Evas_Object *obj, void *event_info);
+static void _on_focus_hook(void *data, Evas_Object *obj);
+static void _elm_hover_sub_obj_placement_eval_cb(void *data, Evas *e, Evas_Object *obj, void *event_info);
+static void _elm_hover_sub_obj_placement_eval(Evas_Object *obj);
+
+static const char SIG_CLICKED[] = "clicked";
+static const char SIG_SMART_LOCATION_CHANGED[] = "smart,changed";
+static const Evas_Smart_Cb_Description _signals[] = {
+  {SIG_CLICKED, ""},
+  {SIG_SMART_LOCATION_CHANGED, ""},
+  {NULL, NULL}
+};
 
 static void
 _del_pre_hook(Evas_Object *obj)
 {
    Widget_Data *wd = elm_widget_data_get(obj);
-   Subinfo *si;
-   if (!wd) return;
+   if (!wd)
+     return;
+
    if (evas_object_visible_get(obj))
-     evas_object_smart_callback_call(obj, "clicked", NULL);
+     evas_object_smart_callback_call(obj, SIG_CLICKED, NULL);
    elm_hover_target_set(obj, NULL);
    elm_hover_parent_set(obj, NULL);
    evas_object_event_callback_del_full(wd->hov, EVAS_CALLBACK_MOVE, _hov_move, obj);
    evas_object_event_callback_del_full(wd->hov, EVAS_CALLBACK_RESIZE, _hov_resize, obj);
    evas_object_event_callback_del_full(wd->hov, EVAS_CALLBACK_SHOW, _hov_show, obj);
    evas_object_event_callback_del_full(wd->hov, EVAS_CALLBACK_HIDE, _hov_hide, obj);
-
-   EINA_LIST_FREE(wd->subs, si)
-     {
-       eina_stringshare_del(si->swallow);
-       free(si);
-     }
 }
 
 static void
@@ -73,19 +111,99 @@ _del_hook(Evas_Object *obj)
 }
 
 static void
+_on_focus_hook(void *data __UNUSED__, Evas_Object *obj)
+{
+   Widget_Data *wd = elm_widget_data_get(obj);
+   if (!wd) return;
+   if (elm_widget_focus_get(obj))
+     {
+       edje_object_signal_emit(wd->cov, "elm,action,focus", "elm");
+       evas_object_focus_set(wd->cov, EINA_TRUE);
+     }
+   else
+     {
+       edje_object_signal_emit(wd->cov, "elm,action,unfocus", "elm");
+       evas_object_focus_set(wd->cov, EINA_FALSE);
+     }
+}
+
+static void
 _theme_hook(Evas_Object *obj)
 {
    Widget_Data *wd = elm_widget_data_get(obj);
    if (!wd) return;
-   // FIXME: hover contents doesnt seem to propagate resizes properly
+   // FIXME: hover contents doesn't seem to propagate resizes properly
    _elm_theme_object_set(obj, wd->cov, "hover", "base", elm_widget_style_get(obj));
    edje_object_scale_set(wd->cov, elm_widget_scale_get(obj) *
                          _elm_config->scale);
-   _reval_content(obj);
+
+   if (wd->smt_sub)
+      _elm_hover_sub_obj_placement_eval(obj);
+   else
+      _reval_content(obj);
    _sizing_eval(obj);
    if (evas_object_visible_get(wd->cov)) _hov_show_do(obj);
 }
 
+static void
+_signal_emit_hook(Evas_Object *obj, const char *emission, const char *source)
+{
+   Widget_Data *wd;
+
+   wd = elm_widget_data_get(obj);
+   if (!wd)
+     return;
+
+   edje_object_signal_emit(wd->cov, emission, source);
+}
+
+static void
+_signal_callback_add_hook(Evas_Object *obj, const char *emission, const char *source, void (*func_cb) (void *data, Evas_Object *o, const char *emission, const char *source), void *data)
+{
+   Widget_Data *wd;
+
+   wd = elm_widget_data_get(obj);
+   if (!wd)
+     return;
+
+   edje_object_signal_callback_add(wd->hov, emission, source, func_cb, data);
+}
+
+static void
+_signal_callback_del_hook(Evas_Object *obj, const char *emission, const char *source, void (*func_cb) (void *data, Evas_Object *o, const char *emission, const char *source), void *data)
+{
+   Widget_Data *wd;
+
+   wd = elm_widget_data_get(obj);
+
+   edje_object_signal_callback_del_full(wd->hov, emission, source, func_cb,
+                                        data);
+}
+
+static void
+_elm_hover_left_space_calc(Widget_Data *wd, Evas_Coord *spc_l, Evas_Coord *spc_t, Evas_Coord *spc_r, Evas_Coord *spc_b)
+{
+   Evas_Coord x = 0, y = 0, w = 0, h = 0, x2 = 0, y2 = 0, w2 = 0, h2 = 0;
+
+   if (wd->parent)
+     evas_object_geometry_get(wd->parent, &x, &y, &w, &h);
+   if (wd->target)
+     evas_object_geometry_get(wd->target, &x2, &y2, &w2, &h2);
+
+   *spc_l = x2 - x;
+   *spc_r = (x + w) - (x2 + w2);
+   if (*spc_l < 0)
+     *spc_l = 0;
+   if (*spc_r < 0)
+     *spc_r = 0;
+
+   *spc_t = y2 - y;
+   *spc_b = (y + h) - (y2 + h2);
+   if (*spc_t < 0)
+     *spc_t = 0;
+   if (*spc_b < 0)
+     *spc_b = 0;
+}
 
 static void
 _sizing_eval(Evas_Object *obj)
@@ -107,30 +225,110 @@ static void
 _reval_content(Evas_Object *obj)
 {
    Widget_Data *wd = elm_widget_data_get(obj);
-   const Eina_List *l;
-   const Subinfo *si;
-   if (!wd) return;
-   EINA_LIST_FOREACH(wd->subs, l, si)
-     edje_object_part_swallow(wd->cov, si->swallow, si->obj);
+   if (!wd)
+     return;
+
+   ELM_HOVER_PARTS_FOREACH
+     {
+        char buf[1024];
+        snprintf(buf, sizeof(buf), "elm.swallow.slot.%s", wd->subs[i].swallow);
+        edje_object_part_swallow(wd->cov, buf, wd->subs[i].obj);
+     }
+}
+
+static const char *
+_elm_hover_smart_content_location_get(Widget_Data *wd,  Evas_Coord spc_l, Evas_Coord spc_t, Evas_Coord spc_r, Evas_Coord spc_b)
+{
+   Evas_Coord c_w = 0, c_h = 0, mid_w, mid_h;
+   int max;
+
+   evas_object_size_hint_min_get(wd->smt_sub, &c_w, &c_h);
+   mid_w = c_w / 2;
+   mid_h = c_h / 2;
+
+   if (spc_l > spc_r)
+     goto left;
+
+   max = MAX(spc_t, spc_r);
+   max = MAX(max, spc_b);
+
+   if (max == spc_t)
+     {
+        if (mid_w > spc_l)
+          return _HOV_TOP_RIGHT;
+
+        return _HOV_TOP;
+     }
+
+   if (max == spc_r)
+     {
+        if (mid_h > spc_t)
+          return _HOV_BOTTOM_RIGHT;
+        else if (mid_h > spc_b)
+          return _HOV_TOP_RIGHT;
+
+        return _HOV_RIGHT;
+     }
+
+   if (mid_h > spc_l)
+     return _HOV_BOTTOM_RIGHT;
+
+   return _HOV_BOTTOM;
+
+left:
+   max = MAX(spc_t, spc_l);
+   max = MAX(max, spc_b);
+
+   if (max == spc_t)
+     {
+        if (mid_w > spc_r)
+          return _HOV_TOP_LEFT;
+
+        return _HOV_TOP;
+     }
+
+   if (max == spc_l)
+     {
+        if (mid_h > spc_t)
+          return _HOV_BOTTOM_LEFT;
+        else if (mid_h > spc_b)
+          return _HOV_TOP_LEFT;
+
+        return _HOV_LEFT;
+     }
+
+   if (mid_h > spc_r)
+     return _HOV_BOTTOM_LEFT;
+
+   return _HOV_BOTTOM;
 }
 
 static void
 _sub_del(void *data __UNUSED__, Evas_Object *obj, void *event_info)
 {
-   Widget_Data *wd = elm_widget_data_get(obj);
-   Evas_Object *sub = event_info;
-   Eina_List *l;
-   Subinfo *si;
-   if (!wd) return;
-   EINA_LIST_FOREACH(wd->subs, l, si)
+   Widget_Data *wd;
+   Evas_Object *sub;
+
+   sub = event_info;
+   wd = elm_widget_data_get(obj);
+   if (!wd)
+     return;
+
+   if (wd->smt_sub)
      {
-       if (si->obj == sub)
-         {
-            wd->subs = eina_list_remove_list(wd->subs, l);
-            eina_stringshare_del(si->swallow);
-            free(si);
-            break;
-         }
+        if (wd->smt_sub == sub)
+           wd->smt_sub = NULL;
+     }
+   else
+     {
+        ELM_HOVER_PARTS_FOREACH
+          {
+             if (wd->subs[i].obj == sub)
+               {
+                  wd->subs[i].obj = NULL;
+                  break;
+               }
+          }
      }
 }
 
@@ -138,22 +336,23 @@ static void
 _hov_show_do(Evas_Object *obj)
 {
    Widget_Data *wd = elm_widget_data_get(obj);
-   const Eina_List *l;
-   const Subinfo *si;
-   if (!wd) return;
+   if (!wd)
+     return;
+
    if (wd->cov)
      {
        evas_object_show(wd->cov);
        edje_object_signal_emit(wd->cov, "elm,action,show", "elm");
      }
-   EINA_LIST_FOREACH(wd->subs, l, si)
+
+   ELM_HOVER_PARTS_FOREACH
      {
        char buf[1024];
 
-       if (!strncmp(si->swallow, "elm.swallow.slot.", 17))
+       if (wd->subs[i].obj)
          {
             snprintf(buf, sizeof(buf), "elm,action,slot,%s,show",
-                     si->swallow + 17);
+                     wd->subs[i].swallow);
             edje_object_signal_emit(wd->cov, buf, "elm");
          }
      }
@@ -181,22 +380,21 @@ static void
 _hov_hide(void *data, Evas *e __UNUSED__, Evas_Object *obj __UNUSED__, void *event_info __UNUSED__)
 {
    Widget_Data *wd = elm_widget_data_get(data);
-   const Eina_List *l;
-   const Subinfo *si;
    if (!wd) return;
    if (wd->cov)
      {
        edje_object_signal_emit(wd->cov, "elm,action,hide", "elm");
        evas_object_hide(wd->cov);
      }
-   EINA_LIST_FOREACH(wd->subs, l, si)
+
+   ELM_HOVER_PARTS_FOREACH
      {
        char buf[1024];
 
-       if (!strncmp(si->swallow, "elm.swallow.slot.", 17))
+       if (wd->subs[i].obj)
          {
             snprintf(buf, sizeof(buf), "elm,action,slot,%s,hide",
-                     si->swallow + 17);
+                     wd->subs[i].swallow);
             edje_object_signal_emit(wd->cov, buf, "elm");
          }
      }
@@ -211,12 +409,23 @@ _target_del(void *data, Evas *e __UNUSED__, Evas_Object *obj __UNUSED__, void *e
 }
 
 static void
+_target_move(void *data, Evas *e __UNUSED__, Evas_Object *obj __UNUSED__, void *event_info __UNUSED__)
+{
+   Widget_Data *wd = elm_widget_data_get(data);
+   if (!wd)
+     return;
+
+   _sizing_eval(data);
+   _elm_hover_sub_obj_placement_eval(data);
+}
+
+static void
 _signal_dismiss(void *data, Evas_Object *obj __UNUSED__, const char *emission __UNUSED__, const char *source __UNUSED__)
 {
    Widget_Data *wd = elm_widget_data_get(data);
    if (!wd) return;
    evas_object_hide(data);
-   evas_object_smart_callback_call(data, "clicked", NULL);
+   evas_object_smart_callback_call(data, SIG_CLICKED, NULL);
 }
 
 static void
@@ -241,7 +450,7 @@ _parent_hide(void *data, Evas *e __UNUSED__, Evas_Object *obj __UNUSED__, void *
 {
    Widget_Data *wd = elm_widget_data_get(data);
    if (!wd) return;
-   if (wd) evas_object_hide(wd->cov);
+   evas_object_hide(wd->cov);
 }
 
 static void
@@ -268,19 +477,31 @@ elm_hover_add(Evas_Object *parent)
    Evas *e;
    Widget_Data *wd;
 
+   EINA_SAFETY_ON_NULL_RETURN_VAL(parent, NULL);
+
    wd = ELM_NEW(Widget_Data);
+
+   ELM_HOVER_PARTS_FOREACH
+     wd->subs[i].swallow = _directions[i];
+
    e = evas_object_evas_get(parent);
+   if (!e) return NULL;
    obj = elm_widget_add(e);
    ELM_SET_WIDTYPE(widtype, "hover");
    elm_widget_type_set(obj, "hover");
    elm_widget_sub_object_add(parent, obj);
+   elm_widget_on_focus_hook_set(obj, _on_focus_hook, NULL);
    elm_widget_data_set(obj, wd);
    elm_widget_del_pre_hook_set(obj, _del_pre_hook);
    elm_widget_theme_hook_set(obj, _theme_hook);
    elm_widget_del_hook_set(obj, _del_hook);
+   elm_widget_can_focus_set(obj, EINA_TRUE);
+   elm_widget_signal_emit_hook_set(obj, _signal_emit_hook);
+   elm_widget_signal_callback_add_hook_set(obj, _signal_callback_add_hook);
+   elm_widget_signal_callback_del_hook_set(obj, _signal_callback_del_hook);
 
    wd->hov = evas_object_rectangle_add(e);
-   evas_object_pass_events_set(wd->hov, 1);
+   evas_object_pass_events_set(wd->hov, EINA_TRUE);
    evas_object_color_set(wd->hov, 0, 0, 0, 0);
    elm_widget_resize_object_set(obj, wd->hov);
    evas_object_event_callback_add(wd->hov, EVAS_CALLBACK_MOVE, _hov_move, obj);
@@ -295,12 +516,12 @@ elm_hover_add(Evas_Object *parent)
                                    _signal_dismiss, obj);
 
    wd->offset = evas_object_rectangle_add(e);
-   evas_object_pass_events_set(wd->offset, 1);
+   evas_object_pass_events_set(wd->offset, EINA_TRUE);
    evas_object_color_set(wd->offset, 0, 0, 0, 0);
    elm_widget_sub_object_add(obj, wd->offset);
 
    wd->size = evas_object_rectangle_add(e);
-   evas_object_pass_events_set(wd->size, 1);
+   evas_object_pass_events_set(wd->size, EINA_TRUE);
    evas_object_color_set(wd->size, 0, 0, 0, 0);
    elm_widget_sub_object_add(obj, wd->size);
 
@@ -309,6 +530,9 @@ elm_hover_add(Evas_Object *parent)
 
    evas_object_smart_callback_add(obj, "sub-object-del", _sub_del, obj);
 
+   elm_hover_parent_set(obj, parent);
+   evas_object_smart_callbacks_descriptions_set(obj, _signals);
+
    _sizing_eval(obj);
    return obj;
 }
@@ -329,13 +553,19 @@ elm_hover_target_set(Evas_Object *obj, Evas_Object *target)
    Widget_Data *wd = elm_widget_data_get(obj);
 
    if (wd->target)
-     evas_object_event_callback_del_full(wd->target, EVAS_CALLBACK_DEL,
-                                    _target_del, obj);
+     {
+        evas_object_event_callback_del_full(wd->target, EVAS_CALLBACK_DEL,
+                                            _target_del, obj);
+        evas_object_event_callback_del_full(wd->target, EVAS_CALLBACK_MOVE,
+                                            _target_move, obj);
+     }
    wd->target = target;
    if (wd->target)
      {
        evas_object_event_callback_add(wd->target, EVAS_CALLBACK_DEL,
                                        _target_del, obj);
+       evas_object_event_callback_add(wd->target, EVAS_CALLBACK_MOVE,
+                                       _target_move, obj);
        elm_widget_hover_object_set(target, obj);
        _sizing_eval(obj);
      }
@@ -392,11 +622,11 @@ elm_hover_parent_set(Evas_Object *obj, Evas_Object *parent)
  *
  * @param obj The hover object
  * @return The target object of the hover.
- * 
+ *
  * @ingroup Hover
  */
 EAPI Evas_Object *
-elm_hover_target_get(Evas_Object *obj)
+elm_hover_target_get(const Evas_Object *obj)
 {
    ELM_CHECK_WIDTYPE(obj, widtype) NULL;
    Widget_Data *wd = elm_widget_data_get(obj);
@@ -414,7 +644,7 @@ elm_hover_target_get(Evas_Object *obj)
  * @ingroup Hover
  */
 EAPI Evas_Object *
-elm_hover_parent_get(Evas_Object *obj)
+elm_hover_parent_get(const Evas_Object *obj)
 {
    ELM_CHECK_WIDTYPE(obj, widtype) NULL;
    Widget_Data *wd = elm_widget_data_get(obj);
@@ -423,95 +653,306 @@ elm_hover_parent_get(Evas_Object *obj)
    return wd->parent;
 }
 
+static void
+_elm_hover_subs_del(Widget_Data *wd)
+{
+   ELM_HOVER_PARTS_FOREACH
+     {
+       if (wd->subs[i].obj)
+         {
+             evas_object_del(wd->subs[i].obj);
+             wd->subs[i].obj = NULL;
+         }
+     }
+}
+
+static void
+_elm_hover_sub_obj_placement_eval(Evas_Object *obj)
+{
+   Evas_Coord spc_l, spc_r, spc_t, spc_b;
+   const char *smart_dir;
+   Widget_Data *wd;
+   char buf[1024];
+
+   wd = elm_widget_data_get(obj);
+   if (!wd->smt_sub)
+     return;
+
+   _elm_hover_left_space_calc(wd, &spc_l, &spc_t, &spc_r, &spc_b);
+
+   edje_object_part_unswallow(wd->cov, wd->smt_sub);
+
+   smart_dir = _elm_hover_smart_content_location_get(wd, spc_l, spc_t, spc_r,
+                                                     spc_b);
+   evas_object_smart_callback_call(obj, SIG_SMART_LOCATION_CHANGED,
+                                   (void *)smart_dir);
+
+   snprintf(buf, sizeof(buf), "elm.swallow.slot.%s", smart_dir);
+   edje_object_part_swallow(wd->cov, buf, wd->smt_sub);
+}
+
+static void
+_elm_hover_sub_obj_placement_eval_cb(void *data, Evas *e __UNUSED__, Evas_Object *obj __UNUSED__, void *event_info __UNUSED__)
+{
+   _elm_hover_sub_obj_placement_eval(data);
+}
+
 /**
  * Sets the content of the hover object and the direction in which
  * it will pop out.
  *
+ * Once the content object is set for a given direction, a previously
+ * set one (on the same direction) will be deleted. If you want to
+ * keep that old content object, use the elm_hover_content_unset()
+ * function.
+ *
  * @param obj The hover object
- * @param swallow The direction that the object will display in. Multiple
- * objects can have the same swallow location. Objects placed in the same
- * swallow will be placed starting at the middle of the hover and ending
- * farther from the middle.
- * Accepted values are "left" "right" "top" "bottom" "middle"
+ * @param swallow The direction that the object will be displayed
+ * at. Accepted values are "left", "top-left", "top", "top-right",
+ * "right", "bottom-right", "bottom", "bottom-left", "middle" and
+ * "smart".
  * @param content The content to place at @p swallow
  *
+ * All directions may have contents at the same time, except for
+ * "smart". This is a special placement hint and its use case
+ * independs of the calculations coming from
+ * elm_hover_best_content_location_get(). Its use is for cases when
+ * one desires only one hover content, but with a dinamic special
+ * placement within the hover area. The content's geometry, whenever
+ * it changes, will be used to decide on a best location not
+ * extrapolating the hover's parent object view to show it in (still
+ * being the hover's target determinant of its medium part -- move and
+ * resize it to simulate finger sizes, for example). If one of the
+ * directions other than "smart" are used, a previously content set
+ * using it will be deleted, and vice-versa.
+ *
  * @ingroup Hover
  */
 EAPI void
 elm_hover_content_set(Evas_Object *obj, const char *swallow, Evas_Object *content)
 {
    ELM_CHECK_WIDTYPE(obj, widtype);
-   Widget_Data *wd = elm_widget_data_get(obj);
-   Subinfo *si;
-   const Eina_List *l;
-   char buf[1024];
-   if (!wd) return;
-   snprintf(buf, sizeof(buf), "elm.swallow.slot.%s", swallow);
-   EINA_LIST_FOREACH(wd->subs, l, si)
+
+   Widget_Data *wd;
+
+   wd = elm_widget_data_get(obj);
+   if (!wd)
+     return;
+
+   if (!strcmp(swallow, "smart"))
+     {
+        if (wd->smt_sub != content)
+          {
+             _elm_hover_subs_del(wd);
+             wd->smt_sub = content;
+          }
+
+        if (content)
+          {
+             elm_widget_sub_object_add(obj, content);
+             evas_object_event_callback_add(wd->smt_sub,
+                                            EVAS_CALLBACK_CHANGED_SIZE_HINTS,
+                                            _elm_hover_sub_obj_placement_eval_cb,
+                                            obj);
+
+             _elm_hover_sub_obj_placement_eval(obj);
+          }
+
+        goto end;
+     }
+
+   if (wd->smt_sub)
+     {
+        evas_object_del(wd->smt_sub);
+        wd->smt_sub = NULL;
+     }
+
+   ELM_HOVER_PARTS_FOREACH
      {
-       if (!strcmp(buf, si->swallow))
+       if (!strcmp(swallow, wd->subs[i].swallow))
          {
-            if (content == si->obj) return;
-            elm_widget_sub_object_del(obj, si->obj);
+            if (content == wd->subs[i].obj)
+               return;
+            evas_object_del(wd->subs[i].obj);
+             wd->subs[i].obj = NULL;
+
+             if (content)
+               {
+                  char buf[1024];
+
+                  snprintf(buf, sizeof(buf), "elm.swallow.slot.%s", swallow);
+                  elm_widget_sub_object_add(obj, content);
+                  edje_object_part_swallow(wd->cov, buf, content);
+                  wd->subs[i].obj = content;
+               }
             break;
          }
      }
-   if (content)
+
+ end:
+   _sizing_eval(obj);
+}
+
+/**
+ * Get the content of the hover object, in a given direction.
+ *
+ * Return the content object which was set for this widget in the
+ * given direction.
+ *
+ * @param obj The hover object
+ * @param swallow The direction that the object was display at.
+ * @return The content that was being used
+ *
+ * @note See elm_hover_content_set() for more information.
+ *
+ * @ingroup Hover
+ */
+EAPI Evas_Object *
+elm_hover_content_get(const Evas_Object *obj, const char *swallow)
+{
+   ELM_CHECK_WIDTYPE(obj, widtype) NULL;
+
+   Widget_Data *wd;
+
+   wd = elm_widget_data_get(obj);
+   if (!wd)
+     return NULL;
+
+   if (!strcmp(swallow, "smart"))
+     return wd->smt_sub;
+
+   ELM_HOVER_PARTS_FOREACH
+     if (!strcmp(swallow, wd->subs[i].swallow))
+       return wd->subs[i].obj;
+
+   return NULL;
+}
+
+static void
+_elm_hover_sub_obj_unparent(Evas_Object *obj)
+{
+   Widget_Data *wd;
+
+   wd = elm_widget_data_get(obj);
+
+   elm_widget_sub_object_del(obj, wd->smt_sub);
+   evas_object_event_callback_del_full(wd->smt_sub,
+                                       EVAS_CALLBACK_CHANGED_SIZE_HINTS,
+                                       _elm_hover_sub_obj_placement_eval_cb,
+                                       obj);
+   edje_object_part_unswallow(wd->cov, wd->smt_sub);
+   wd->smt_sub = NULL;
+}
+
+/**
+ * Unset the content of the hover object, in a given direction.
+ *
+ * Unparent and return the content object set at that direction.
+ *
+ * @param obj The hover object
+ * @param swallow The direction that the object was display at.
+ * @return The content that was being used.
+ *
+ * @note See elm_hover_content_set() for more information.
+ *
+ * @ingroup Hover
+ */
+EAPI Evas_Object *
+elm_hover_content_unset(Evas_Object *obj, const char *swallow)
+{
+   ELM_CHECK_WIDTYPE(obj, widtype) NULL;
+
+   Widget_Data *wd;
+
+   wd = elm_widget_data_get(obj);
+   if (!wd)
+     return NULL;
+
+   if (!strcmp(swallow, "smart"))
      {
-       elm_widget_sub_object_add(obj, content);
-       edje_object_part_swallow(wd->cov, buf, content);
-       si = ELM_NEW(Subinfo);
-       si->swallow = eina_stringshare_add(buf);
-       si->obj = content;
-       wd->subs = eina_list_append(wd->subs, si);
-       _sizing_eval(obj);
+        Evas_Object *content;
+
+        if (!wd->smt_sub)
+          return NULL;
+
+        content = wd->smt_sub;
+        _elm_hover_sub_obj_unparent(obj);
+        return content;
+     }
+
+   ELM_HOVER_PARTS_FOREACH
+     {
+       if (!strcmp(swallow, wd->subs[i].swallow))
+         {
+            Evas_Object *content;
+
+            if (!wd->subs[i].obj)
+               return NULL;
+
+            content = wd->subs[i].obj;
+            elm_widget_sub_object_del(obj, wd->subs[i].obj);
+            edje_object_part_unswallow(wd->cov, wd->subs[i].obj);
+            wd->subs[i].obj = NULL;
+
+            return content;
+         }
      }
+
+   return NULL;
 }
 
 /**
  * Returns the best swallow location for content in the hover.
  *
  * @param obj The hover object
- * @return The edje location to place content into the hover.
- * See also elm_hover_content_set()
+ * @param pref_axis The preferred orientation axis for the hover object to use
+ * @return The edje location to place content into the hover or @c
+ *         NULL, on errors.
+ *
+ * @p pref_axis may be one of
+ * <ul>
+ * - @c ELM_HOVER_AXIS_NONE -- no prefered orientation
+ * - @c ELM_HOVER_AXIS_HORIZONTAL -- horizontal
+ * - @c ELM_HOVER_AXIS_VERTICAL -- vertical
+ * - @c ELM_HOVER_AXIS_BOTH -- both
+ * </ul>
+ *
+ * See also elm_hover_content_set().
  *
  * @ingroup Hover
  */
 EAPI const char *
 elm_hover_best_content_location_get(const Evas_Object *obj, Elm_Hover_Axis pref_axis)
 {
-   ELM_CHECK_WIDTYPE(obj, widtype) "left";
-   Widget_Data *wd = elm_widget_data_get(obj);
-   Evas_Coord x = 0, y = 0, w = 0, h = 0, x2 = 0, y2 = 0, w2 = 0, h2 = 0;
+   ELM_CHECK_WIDTYPE(obj, widtype) NULL;
+
    Evas_Coord spc_l, spc_r, spc_t, spc_b;
-   if (!wd) return "left";
-   if (wd->parent) evas_object_geometry_get(wd->parent, &x, &y, &w, &h);
-   if (wd->target) evas_object_geometry_get(wd->target, &x2, &y2, &w2, &h2);
-   spc_l = x2 - x;
-   spc_r = (x + w) - (x2 + w2);
-   if (spc_l < 0) spc_l = 0;
-   if (spc_r < 0) spc_r = 0;
-   spc_t = y2 - y;
-   spc_b = (y + h) - (y2 + h2);
-   if (spc_t < 0) spc_t = 0;
-   if (spc_b < 0) spc_b = 0;
+   Widget_Data *wd;
+
+   wd = elm_widget_data_get(obj);
+   if (!wd)
+     return NULL;
+
+   _elm_hover_left_space_calc(wd, &spc_l, &spc_t, &spc_r, &spc_b);
+
    if (pref_axis == ELM_HOVER_AXIS_HORIZONTAL)
      {
-       if (spc_l < spc_r) return "right";
-       else return "left";
+       if (spc_l < spc_r) return _HOV_RIGHT;
+       else return _HOV_LEFT;
      }
    else if (pref_axis == ELM_HOVER_AXIS_VERTICAL)
      {
-       if (spc_t < spc_b) return "bottom";
-       else return "top";
+       if (spc_t < spc_b) return _HOV_BOTTOM;
+       else return _HOV_TOP;
      }
+
    if (spc_l < spc_r)
      {
-       if (spc_t > spc_r) return "top";
-       else if (spc_b > spc_r) return "bottom";
-       return "right";
+        if (spc_t > spc_r) return _HOV_TOP;
+        else if (spc_b > spc_r) return _HOV_BOTTOM;
+        return _HOV_RIGHT;
      }
-   if (spc_t > spc_r) return "top";
-   else if (spc_b > spc_r) return "bottom";
-   return "left";
+   if (spc_t > spc_r) return _HOV_TOP;
+   else if (spc_b > spc_r) return _HOV_BOTTOM;
+   return _HOV_LEFT;
 }