#ifndef LWLIB_H
#define LWLIB_H

#include <X11/Intrinsic.h>

/*
** Widget values depend on the Widget type:
** 
** widget:   (name value key enabled data contents/selected)
**
** label:    ("name" "string" NULL NULL NULL NULL)
** button:   ("name" "string" "key" T/F data <default-button-p>)
** button w/menu: 
**           ("name" "string" "key" T/F data (label|button|button w/menu...))
** menubar:  ("name" NULL NULL T/F data (button w/menu))
** selectable thing:
**           ("name" "string" "key" T/F data T/F)
** checkbox: selectable thing
** radio:    ("name" NULL NULL T/F data (selectable thing...))
** strings:  ("name" NULL NULL T/F data (selectable thing...))
** text:     ("name" "string" <ign> T/F data)
** main:     ("name")
*/

typedef unsigned long LWLIB_ID;

typedef enum _change_type
{
  NO_CHANGE = 0,
  INVISIBLE_CHANGE = 1,
  VISIBLE_CHANGE = 2,
  STRUCTURAL_CHANGE = 3
} change_type;

typedef struct _widget_value
{
  /* name of widget */
  char*		name;
  /* value (meaning depend on widget type) */
  char*		value;
  /* keyboard equivalent. no implications for XtTranslations */ 
  char*		key;
  /* true if enabled */
  Boolean	enabled;
  /* true if selected */
  Boolean	selected;
  /* true if was edited (maintained by get_value) */
  Boolean	edited;
  /* true if has changed (maintained by lw library) */
  change_type	change;
  /* true if this widget itself has changed,
     but not counting the other widgets found in the `next' field.  */
  change_type   this_one_change;
  /* Contents of the sub-widgets, also selected slot for checkbox */
  struct _widget_value*	contents;
  /* data passed to callback */
  XtPointer	call_data;
  /* next one in the list */
  struct _widget_value*	next;
  /* slot for the toolkit dependent part.  Always initialize to NULL. */
  void* toolkit_data;
  /* tell us if we should free the toolkit data slot when freeing the
     widget_value itself. */
  Boolean free_toolkit_data;

  /* we resource the widget_value structures; this points to the next
     one on the free list if this one has been deallocated.
   */
  struct _widget_value *free_list;
} widget_value;


typedef void (*lw_callback) (/* Widget w, LWLIB_ID id, void* data */);

void  lw_register_widget (/* char* type, char* name, LWLIB_ID id,
			  widget_value* val, lw_callback pre_activate_cb,
			  lw_callback selection_cb,
			  lw_callback post_activate_cb */);
Widget lw_get_widget (/* LWLIB_ID id, Widget parent, Boolean pop_up_p */);
Widget lw_make_widget (/* LWLIB_ID id, Widget parent, Boolean pop_up_p */);
Widget lw_create_widget (/* char* type, char* name, LWLIB_ID id,
			 widget_value* val, Widget parent, Boolean pop_up_p,
			 lw_callback pre_activate_cb,
			 lw_callback selection_cb,
			 lw_callback post_activate_cb */);
LWLIB_ID lw_get_widget_id (/* Widget w */);
void lw_modify_all_widgets (/* LWLIB_ID id, widget_value* val, Boolean deep_p */);
void lw_destroy_widget (/* Widget w */);
void lw_destroy_all_widgets (/* LWLIB_ID id */);
void lw_destroy_everything (/* void */);
void lw_destroy_all_pop_ups (/* void */);
Widget lw_raise_all_pop_up_widgets (/* void */);
widget_value* lw_get_all_values (/* LWLIB_ID id */);
Boolean lw_get_some_values (/* LWLIB_ID id, widget_value* val */);
void lw_pop_up_all_widgets (/* LWLIB_ID id */);
void lw_pop_down_all_widgets (/* LWLIB_ID id */);
widget_value *malloc_widget_value ();
void free_widget_value (/* widget_value * */);
void lw_popup_menu (/* Widget */);

/* Toolkit independent way of focusing on a Widget at the Xt level. */
void lw_set_keyboard_focus (/* Widget parent, Widget w */);

/* Silly Energize hack to invert the "sheet" button */
void lw_show_busy (/* Widget w, Boolean busy */);

/* Silly hack to assist with Lucid/Athena geometry management. */
void lw_refigure_widget (/* Widget w, Boolean doit */);

/* Toolkit independent way of determining if an event occurred on a
   menubar. */
Boolean lw_window_is_in_menubar (/* Window win, Widget menubar_widget */);

/* Manage resizing: TRUE permits resizing widget w; FALSE disallows it. */
void lw_allow_resizing (/* Widget w, Boolean flag */);

/* Set up the main window. */
void lw_set_main_areas (/* Widget parent,
			   Widget menubar,
			   Widget work_area */);

#endif /* LWLIB_H */