Ecore_Evas: add new API for unset the cursor from Ecore_Evas.

Summary:
Add ecore_evas_cursor_unset function.
Use the new function in the ecore_evas_object_example.

@feature

Test Plan: ecore_evas_object_example

Reviewers: raster, cedric, seoz, Hermet

CC: cedric

Differential Revision: https://phab.enlightenment.org/D812

src/examples/ecore/ecore_evas_object_example.c

@@ -12,20 +12,20 @@
 #include <Ecore.h>
 #include <Ecore_Evas.h>
 
+Evas_Object *cursor;
+
 static void
 _mouse_down_cb(void *data, Evas *evas EINA_UNUSED, Evas_Object *obj EINA_UNUSED, void *event_info EINA_UNUSED)
 {
    static Eina_Bool flag = EINA_FALSE;
 
    if (!flag)
-     ecore_evas_object_cursor_set(data, NULL, 0, 1, 1);
-   else
      {
-        Evas_Object *cursor = evas_object_rectangle_add(ecore_evas_get(data));
-        evas_object_color_set(cursor, 0, 255, 0, 255);
-        evas_object_resize(cursor, 5, 10);
-        ecore_evas_object_cursor_set(data, cursor, 0, 1, 1);
+        ecore_evas_cursor_unset(data);
+        ecore_evas_object_cursor_set(data, NULL, 0, 1, 1);
      }
+   else
+     ecore_evas_object_cursor_set(data, cursor, 0, 1, 1);
 
    flag = !flag;
 }
@@ -34,7 +34,7 @@ int
 main(void)
 {
    Ecore_Evas *ee;
-   Evas_Object *bg, *cursor, *obj;
+   Evas_Object *bg, *obj;
    int layer, x, y;
 
    ecore_evas_init();

src/lib/ecore_evas/Ecore_Evas.h

@@ -1939,6 +1939,7 @@ EAPI void        ecore_evas_cursor_set(Ecore_Evas *ee, const char *file, int lay
  * @see ecore_evas_object_cursor_set()
  */
 EAPI void        ecore_evas_cursor_get(const Ecore_Evas *ee, Evas_Object **obj, int *layer, int *hot_x, int *hot_y);
+
 /**
  * @brief Set the cursor of an Ecore_Evas
  *
@@ -1958,6 +1959,21 @@ EAPI void        ecore_evas_cursor_get(const Ecore_Evas *ee, Evas_Object **obj,
  */
 EAPI void        ecore_evas_object_cursor_set(Ecore_Evas *ee, Evas_Object *obj, int layer, int hot_x, int hot_y);
 
+/**
+ * @brief Unset the Ecore_Evas cursor
+ *
+ * @param ee The Ecore_Evas to uset the cursor.
+ *
+ * This function unset the cursor from the Ecore_Evas and return the cursor
+ * object. If the cursor was setted from ecore_evas_cursor_set() fuction
+ * returned the image. In this case this image need to delete when it not be
+ * needed.
+ *
+ * @see ecore_evas_cursor_set()
+ * @see ecore_evas_object_cursor_set()
+ */
+EAPI Evas_Object*        ecore_evas_cursor_unset(Ecore_Evas *ee);
+
 /**
  * Tell the WM whether or not to ignore an Ecore_Evas' window
  *

src/lib/ecore_evas/ecore_evas.c

@@ -1725,6 +1725,24 @@ ecore_evas_cursor_get(const Ecore_Evas *ee, Evas_Object **obj, int *layer, int *
    if (hot_y) *hot_y = ee->prop.cursor.hot.y;
 }
 
+EAPI Evas_Object *
+ecore_evas_cursor_unset(Ecore_Evas *ee)
+{
+   Evas_Object *obj;
+
+   if (!ECORE_MAGIC_CHECK(ee, ECORE_MAGIC_EVAS))
+     {
+        ECORE_MAGIC_FAIL(ee, ECORE_MAGIC_EVAS,
+                         "ecore_evas_cursor_unset");
+        return NULL;
+     }
+   obj = ee->prop.cursor.object;
+   evas_object_hide(obj);
+   ee->prop.cursor.object = NULL;
+
+   return obj;
+}
+
 EAPI void
 ecore_evas_layer_set(Ecore_Evas *ee, int layer)
 {