/**
 * PANDA 3D SOFTWARE
 * Copyright (c) Carnegie Mellon University.  All rights reserved.
 *
 * All use of this software is subject to the terms of the revised BSD
 * license.  You should have received a copy of this license along
 * with this source code in a file named "LICENSE."
 *
 * @file pgItem.h
 * @author drose
 * @date 2002-03-13
 */

#ifndef PGITEM_H
#define PGITEM_H

#include "pandabase.h"

#include "pgMouseWatcherRegion.h"
#include "pgFrameStyle.h"
#include "pgItemNotify.h"

#include "pandaNode.h"
#include "nodePath.h"
#include "luse.h"
#include "pointerTo.h"
#include "textNode.h"
#include "plane.h"
#include "pmap.h"
#include "lightReMutex.h"
#include "lightReMutexHolder.h"

#ifdef HAVE_AUDIO
#include "audioSound.h"
#endif

class PGTop;
class MouseWatcherParameter;
class AudioSound;
class ClipPlaneAttrib;
class ScissorAttrib;

/**
 * This is the base class for all the various kinds of gui widget objects.
 *
 * It is a Node which corresponds to a rectangular region on the screen, and
 * it may have any number of "state" subgraphs, one of which is rendered at
 * any given time according to its current state.
 *
 * The PGItem node must be parented to the scene graph somewhere beneath a
 * PGTop node in order for this behavior to work.
 */
class EXPCL_PANDA_PGUI PGItem : public PandaNode {
PUBLISHED:
  explicit PGItem(const std::string &name);
  virtual ~PGItem();

  INLINE void set_name(const std::string &name);

protected:
  PGItem(const PGItem &copy);

  virtual PandaNode *make_copy() const;
  virtual void transform_changed();
  virtual void draw_mask_changed();

  virtual bool cull_callback(CullTraverser *trav, CullTraverserData &data);
  virtual bool is_renderable() const;

  virtual void compute_internal_bounds(CPT(BoundingVolume) &internal_bounds,
                                       int &internal_vertices,
                                       int pipeline_stage,
                                       Thread *current_thread) const;

  virtual void r_prepare_scene(GraphicsStateGuardianBase *gsg,
                               const RenderState *node_state,
                               GeomTransformer &transformer,
                               Thread *current_thread);

  virtual void xform(const LMatrix4 &mat);
  bool activate_region(const LMatrix4 &transform, int sort,
                       const ClipPlaneAttrib *cpa,
                       const ScissorAttrib *sa);

public:
  INLINE PGMouseWatcherRegion *get_region() const;

  virtual void enter_region(const MouseWatcherParameter &param);
  virtual void exit_region(const MouseWatcherParameter &param);
  virtual void within_region(const MouseWatcherParameter &param);
  virtual void without_region(const MouseWatcherParameter &param);
  virtual void focus_in();
  virtual void focus_out();
  virtual void press(const MouseWatcherParameter &param, bool background);
  virtual void release(const MouseWatcherParameter &param, bool background);
  virtual void keystroke(const MouseWatcherParameter &param, bool background);
  virtual void candidate(const MouseWatcherParameter &param, bool background);
  virtual void move(const MouseWatcherParameter &param);

  static void background_press(const MouseWatcherParameter &param);
  static void background_release(const MouseWatcherParameter &param);
  static void background_keystroke(const MouseWatcherParameter &param);
  static void background_candidate(const MouseWatcherParameter &param);

  INLINE void set_notify(PGItemNotify *notify);
  INLINE bool has_notify() const;
  INLINE PGItemNotify *get_notify() const;

PUBLISHED:
  INLINE void set_frame(PN_stdfloat left, PN_stdfloat right, PN_stdfloat bottom, PN_stdfloat top);
  INLINE void set_frame(const LVecBase4 &frame);
  INLINE const LVecBase4 &get_frame() const;
  INLINE bool has_frame() const;
  INLINE void clear_frame();

  INLINE void set_state(int state);
  INLINE int get_state() const;

  virtual void set_active(bool active);
  INLINE bool get_active() const;

  virtual void set_focus(bool focus);
  INLINE bool get_focus() const;

  void set_background_focus(bool focus);
  INLINE bool get_background_focus() const;

  INLINE void set_suppress_flags(int suppress_flags);
  INLINE int get_suppress_flags() const;

  int get_num_state_defs() const;
  void clear_state_def(int state);
  bool has_state_def(int state) const;
  INLINE NodePath &get_state_def(int state);
  MAKE_SEQ(get_state_defs, get_num_state_defs, get_state_def);
  NodePath instance_to_state_def(int state, const NodePath &path);

  PGFrameStyle get_frame_style(int state);
  void set_frame_style(int state, const PGFrameStyle &style);

  INLINE const std::string &get_id() const;
  INLINE void set_id(const std::string &id);

  INLINE static std::string get_enter_prefix();
  INLINE static std::string get_exit_prefix();
  INLINE static std::string get_within_prefix();
  INLINE static std::string get_without_prefix();
  INLINE static std::string get_focus_in_prefix();
  INLINE static std::string get_focus_out_prefix();
  INLINE static std::string get_press_prefix();
  INLINE static std::string get_repeat_prefix();
  INLINE static std::string get_release_prefix();
  INLINE static std::string get_keystroke_prefix();

  INLINE std::string get_enter_event() const;
  INLINE std::string get_exit_event() const;
  INLINE std::string get_within_event() const;
  INLINE std::string get_without_event() const;
  INLINE std::string get_focus_in_event() const;
  INLINE std::string get_focus_out_event() const;
  INLINE std::string get_press_event(const ButtonHandle &button) const;
  INLINE std::string get_repeat_event(const ButtonHandle &button) const;
  INLINE std::string get_release_event(const ButtonHandle &button) const;
  INLINE std::string get_keystroke_event() const;

  INLINE LMatrix4 get_frame_inv_xform() const;

#ifdef HAVE_AUDIO
  void set_sound(const std::string &event, AudioSound *sound);
  void clear_sound(const std::string &event);
  AudioSound *get_sound(const std::string &event) const;
  bool has_sound(const std::string &event) const;
#endif

  static TextNode *get_text_node();
  INLINE static void set_text_node(TextNode *node);

  INLINE static PGItem *get_focus_item();

protected:
  void play_sound(const std::string &event);

  void reduce_region(LVecBase4 &clip, PGItem *obscurer) const;
  void reduce_region(LVecBase4 &frame, PN_stdfloat px, PN_stdfloat py) const;
  LVecBase4 get_relative_frame(PGItem *item) const;
  LPoint3 mouse_to_local(const LPoint2 &mouse_point) const;

  virtual void frame_changed();

private:
  NodePath &do_get_state_def(int state);
  void slot_state_def(int state);
  void update_frame(int state);
  void mark_frames_stale();

  INLINE static PN_stdfloat compute_area(const LVecBase4 &frame);
  INLINE static void compare_largest(const LVecBase4 *&largest,
                                     PN_stdfloat &largest_area,
                                     const LVecBase4 *new_frame);

  typedef pvector<LVecBase2> ClipPoints;
  bool clip_frame(ClipPoints &source_points, const LPlane &plane) const;

protected:
  LightReMutex _lock;

private:
  PGItemNotify *_notify;

  bool _has_frame;
  LVecBase4 _frame;
  int _state;
  enum Flags {
    F_active             = 0x01,
    F_focus              = 0x02,
    F_background_focus   = 0x04,
  };
  int _flags;

  PT(PGMouseWatcherRegion) const _region;

  LMatrix4 _frame_inv_xform;

  class StateDef {
  public:
    INLINE StateDef();
    NodePath _root;
    PGFrameStyle _frame_style;
    NodePath _frame;
    bool _frame_stale;
  };
  typedef pvector<StateDef> StateDefs;
  StateDefs _state_defs;

#ifdef HAVE_AUDIO
  typedef pmap<std::string, PT(AudioSound) > Sounds;
  Sounds _sounds;
#endif

  static PT(TextNode) _text_node;
  static PGItem *_focus_item;

  typedef pset<PGItem *> BackgroundFocus;
  static BackgroundFocus _background_focus;

public:
  static TypeHandle get_class_type() {
    return _type_handle;
  }
  static void init_type() {
    PandaNode::init_type();
    register_type(_type_handle, "PGItem",
                  PandaNode::get_class_type());
  }
  virtual TypeHandle get_type() const {
    return get_class_type();
  }
  virtual TypeHandle force_init_type() {init_type(); return get_class_type();}

private:
  static TypeHandle _type_handle;
};

#include "pgItem.I"

#endif