text: /*************************************************************************/
  /*  visibility_notifier_2d.h                                             */
  /*************************************************************************/
  /*                       This file is part of:                           */
  /*                           GODOT ENGINE                                */
  /*                    http://www.godotengine.org                         */
  /*************************************************************************/
  /* Copyright (c) 2007-2014 Juan Linietsky, Ariel Manzur.                 */
  /*                                                                       */
  /* Permission is hereby granted, free of charge, to any person obtaining */
  /* a copy of this software and associated documentation files (the       */
  /* "Software"), to deal in the Software without restriction, including   */
  /* without limitation the rights to use, copy, modify, merge, publish,   */
  /* distribute, sublicense, and/or sell copies of the Software, and to    */
  /* permit persons to whom the Software is furnished to do so, subject to */
  /* the following conditions:                                             */
  /*                                                                       */
  /* The above copyright notice and this permission notice shall be        */
  /* included in all copies or substantial portions of the Software.       */
  /*                                                                       */
  /* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,       */
  /* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF    */
  /* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
  /* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY  */
  /* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,  */
  /* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE     */
  /* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                */
  /*************************************************************************/
  #ifndef VISIBILITY_NOTIFIER_2D_H
  #define VISIBILITY_NOTIFIER_2D_H
  
  #include "scene/2d/node_2d.h"
  
  class Viewport;
  class VisibilityNotifier2D : public Node2D {
  
  	OBJ_TYPE(VisibilityNotifier2D,Node2D);
  
  	Set<Viewport*> viewports;
  
  	Rect2 rect;
  
  protected:
  friend class SpatialIndexer2D;
  
  	void _enter_viewport(Viewport* p_viewport);
  	void _exit_viewport(Viewport* p_viewport);
  
  
  	virtual void _screen_enter() {}
  	virtual void _screen_exit() {}
  
  	void _notification(int p_what);
  	static void _bind_methods();
  public:
  
  	void set_rect(const Rect2& p_rect);
  	Rect2 get_rect() const;
  
  	bool is_on_screen() const;
  
  	virtual Rect2 get_item_rect() const;
  
  	VisibilityNotifier2D();
  };
  
  
  class VisibilityEnabler2D : public VisibilityNotifier2D {
  
  	OBJ_TYPE(VisibilityEnabler2D,VisibilityNotifier2D);
  public:
  
  	enum Enabler {
  		ENABLER_PAUSE_ANIMATIONS,
  		ENABLER_FREEZE_BODIES,
  		ENABLER_MAX
  	};
  
  protected:
  
  	virtual void _screen_enter();
  	virtual void _screen_exit();
  
  	bool visible;
  
  	void _find_nodes(Node* p_node);
  
  	Map<Node*,Variant> nodes;
  	void _node_removed(Node* p_node);
  	bool enabler[ENABLER_MAX];
  
  	void _change_node_state(Node* p_node,bool p_enabled);
  
  	void _notification(int p_what);
  	static void _bind_methods();
  
  public:
  
  	void set_enabler(Enabler p_enabler,bool p_enable);
  	bool is_enabler_enabled(Enabler p_enabler) const;
  
  	VisibilityEnabler2D();
  
  };
  
  VARIANT_ENUM_CAST(VisibilityEnabler2D::Enabler);
  
  
  #endif // VISIBILITY_NOTIFIER_2D_H
  