301 lines
8.8 KiB
C
301 lines
8.8 KiB
C
#include "evas_common.h"
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#include "evas_private.h"
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void
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evas_object_clip_dirty(Evas_Object *obj)
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{
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Evas_List *l;
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obj->cur.cache.clip.dirty = 1;
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for (l = obj->clip.clipees; l; l = l->next)
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evas_object_clip_dirty(l->data);
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}
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void
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evas_object_recalc_clippees(Evas_Object *obj)
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{
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Evas_List *l;
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if (obj->cur.cache.clip.dirty)
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{
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evas_object_clip_recalc(obj);
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for (l = obj->clip.clipees; l; l = l->next)
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evas_object_recalc_clippees(l->data);
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}
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}
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int
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evas_object_clippers_was_visible(Evas_Object *obj)
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{
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if (obj->prev.visible)
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{
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if (obj->prev.clipper)
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return evas_object_clippers_is_visible(obj->prev.clipper);
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return 1;
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}
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return 0;
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}
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/* public functions */
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/**
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* @defgroup Evas_Clip_Group Clip Functions
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*
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* Functions that manage the clipping of objects by other objects.
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*/
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/**
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* Clip one object to another.
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* @param obj The object to be clipped
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* @param clip The object to clip @p obj by
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*
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* This function will clip the object @p obj to the area occupied by the
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* object @p clipper. This means the object @p obj will only be visible within
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* the area occupied by the clipping object (@p clip). The color of the object
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* being clipped will be multiplied by the color of the clipping object, so
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* the resulting color for the clipped object is
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* RESULT = (OBJ * CLIP) / (255 * 255) per color element (red, green, blue and
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* alpha). Clipping is recursive, so clip objects may be clipped by other
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* objects, and their color will in tern be multiplied. You may NOT set up
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* circular clipping lists (i.e. object 1 clips object 2 which clips object 1).
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* The behavior of Evas is undefined in this case. Objects which do not clip
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* others are visible as normal, those that clip 1 or more objects become
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* invisible themselves, only affecting what they clip. If an object ceases to
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* have other objects being clipped by it, it will become visible again. The
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* visibility of an object affects the objects that are clipped by it, so if
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* the object clipping others is not shown, the objects clipped will not be
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* shown either. If the object was being clipped by another object when this
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* function is called, it is implicitly removed from the clipper it is being
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* clipped to, and now is made to clip its new clipper.
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*
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* At the moment the only objects that can validly be used to clip other
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* objects are rectangle objects. All other object types are invalid and the
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* result of using them is undefined.
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*
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* The clip object @p clip must be a valid object, but may also be NULL in
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* which case the effect of this function is the same as calling
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* evas_object_clip_unset() on the @p obj object.
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*
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* Example:
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* @code
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* extern Evas *evas;
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* extern Evas_Object *obj;
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* Evas_Object *clipper;
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*
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* clipper = evas_object_rectangle_add(evas);
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* evas_object_color_set(clipper, 255, 255, 255, 255);
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* evas_object_move(clipper, 10, 10);
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* evas_object_resize(clipper, 20, 50);
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* evas_object_clip_set(obj, clipper);
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* evas_object_show(clipper);
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* @endcode
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*
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* @ingroup Evas_Clip_Group
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*/
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EAPI void
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evas_object_clip_set(Evas_Object *obj, Evas_Object *clip)
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{
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MAGIC_CHECK(obj, Evas_Object, MAGIC_OBJ);
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return;
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MAGIC_CHECK_END();
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if (!clip)
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{
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evas_object_clip_unset(obj);
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return;
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}
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MAGIC_CHECK(clip, Evas_Object, MAGIC_OBJ);
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return;
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MAGIC_CHECK_END();
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if (obj->cur.clipper == clip) return;
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if (obj == clip) return;
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if (evas_object_intercept_call_clip_set(obj, clip)) return;
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if (obj->smart.smart)
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{
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if (obj->smart.smart->smart_class->clip_set)
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obj->smart.smart->smart_class->clip_set(obj, clip);
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}
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if (obj->cur.clipper)
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{
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/* unclip */
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obj->cur.clipper->clip.clipees = evas_list_remove(obj->cur.clipper->clip.clipees, obj);
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if (!obj->cur.clipper->clip.clipees) obj->cur.clipper->cur.have_clipees = 0;
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evas_object_change(obj->cur.clipper);
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evas_object_change(obj);
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obj->cur.clipper = NULL;
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}
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/* clip me */
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if ((clip->clip.clipees == NULL) && (clip->cur.visible))
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{
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/* Basically it just went invisible */
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clip->changed = 1;
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clip->layer->evas->changed = 1;
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evas_damage_rectangle_add(clip->layer->evas,
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clip->cur.geometry.x, clip->cur.geometry.y,
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clip->cur.geometry.w, clip->cur.geometry.h);
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}
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obj->cur.clipper = clip;
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clip->clip.clipees = evas_list_append(clip->clip.clipees, obj);
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if (clip->clip.clipees) clip->cur.have_clipees = 1;
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evas_object_change(clip);
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evas_object_change(obj);
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evas_object_clip_dirty(obj);
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evas_object_recalc_clippees(obj);
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if (!obj->smart.smart)
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{
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if (evas_object_is_in_output_rect(obj,
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obj->layer->evas->pointer.x,
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obj->layer->evas->pointer.y, 1, 1))
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evas_event_feed_mouse_move(obj->layer->evas,
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obj->layer->evas->pointer.x,
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obj->layer->evas->pointer.y,
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obj->layer->evas->last_timestamp,
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NULL);
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}
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}
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/**
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* Get the object clipping this one (if any).
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* @param obj The object to get the clipper from
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*
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* This function returns the the object clipping @p obj. If @p obj not being
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* clipped, NULL is returned. The object @p obj must be a valid object.
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*
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* See also evas_object_clip_set(), evas_object_clip_unset() and
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* evas_object_clipees_get().
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*
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* Example:
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* @code
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* extern Evas_Object *obj;
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* Evas_Object *clipper;
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*
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* clipper = evas_object_clip_get(obj);
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* if (clipper) evas_object_show(clipper);
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* @endcode
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*
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* @ingroup Evas_Clip_Group
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*/
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EAPI Evas_Object *
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evas_object_clip_get(const Evas_Object *obj)
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{
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MAGIC_CHECK(obj, Evas_Object, MAGIC_OBJ);
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return NULL;
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MAGIC_CHECK_END();
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return obj->cur.clipper;
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}
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/**
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* Disable clipping for an object.
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*
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* @param obj The object to cease clipping on
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*
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* This function disables clipping for the object @p obj, if it was already
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* clipped. If it wasn't, this has no effect. The object @p obj must be a
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* valid object.
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*
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* See also evas_object_clip_set(), evas_object_clipees_get() and
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* evas_object_clip_get().
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*
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* Example:
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* @code
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* extern Evas_Object *obj;
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* Evas_Object *clipper;
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*
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* clipper = evas_object_clip_get(obj);
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* if (clipper)
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* {
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* evas_object_clip_unset(obj);
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* evas_object_hide(obj);
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* }
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* @endcode
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*
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* @ingroup Evas_Clip_Group
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*/
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EAPI void
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evas_object_clip_unset(Evas_Object *obj)
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{
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MAGIC_CHECK(obj, Evas_Object, MAGIC_OBJ);
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return;
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MAGIC_CHECK_END();
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if (!obj->cur.clipper) return;
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/* unclip */
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if (evas_object_intercept_call_clip_unset(obj)) return;
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if (obj->smart.smart)
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{
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if (obj->smart.smart->smart_class->clip_unset)
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obj->smart.smart->smart_class->clip_unset(obj);
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}
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if (obj->cur.clipper)
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{
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obj->cur.clipper->clip.clipees = evas_list_remove(obj->cur.clipper->clip.clipees, obj);
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if (!obj->cur.clipper->clip.clipees)
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obj->cur.clipper->cur.have_clipees = 0;
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evas_object_change(obj->cur.clipper);
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}
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obj->cur.clipper = NULL;
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evas_object_change(obj);
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evas_object_clip_dirty(obj);
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evas_object_recalc_clippees(obj);
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if (!obj->smart.smart)
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{
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if (evas_object_is_in_output_rect(obj,
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obj->layer->evas->pointer.x,
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obj->layer->evas->pointer.y, 1, 1))
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evas_event_feed_mouse_move(obj->layer->evas,
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obj->layer->evas->pointer.x,
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obj->layer->evas->pointer.y,
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obj->layer->evas->last_timestamp,
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NULL);
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}
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}
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/**
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* Return a list of objects currently clipped by a specific object.
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*
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* @param obj The object to get a list of clippees from
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*
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* This returns the inernal list handle that contains all objects clipped by
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* the object @p obj. If none are clipped, it returns NULL. This list is only
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* valid until the clip list is changed and should be fetched again with another
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* call to evas_object_clipees_get() if any objects being clipped by this object
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* are unclipped, clipped by a new object, are deleted or the clipper is
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* deleted. These operations will invalidate the list returned so it should
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* not be used anymore after that point. Any use of the list after this may have
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* undefined results, not limited just to strange behavior but possible
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* segfaults and other strange memory errors. The object @p obj must be a valid
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* object.
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*
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* See also evas_object_clip_set(), evas_object_clip_unset() and
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* evas_object_clip_get().
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*
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* Example:
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* @code
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* extern Evas_Object *obj;
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* Evas_Object *clipper;
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*
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* clipper = evas_object_clip_get(obj);
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* if (clipper)
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* {
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* Evas_List *clippees, *l;
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*
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* clippees = evas_object_clipees_get(clipper);
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* printf("Clipper clips %i objects\n", evas_list_count(clippees));
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* for (l = clippees; l; l = l->next)
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* {
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* Evas_Object *obj_tmp;
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*
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* obj_tmp = l->data;
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* evas_object_show(obj_tmp);
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* }
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* }
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* @endcode
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* @ingroup Evas_Clip_Group
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*/
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EAPI const Evas_List *
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evas_object_clipees_get(const Evas_Object *obj)
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{
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MAGIC_CHECK(obj, Evas_Object, MAGIC_OBJ);
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return NULL;
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MAGIC_CHECK_END();
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return obj->clip.clipees;
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}
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