/* A general interface to the widgets of different toolkits.
   Copyright (C) 1992, 1993, 1994 Lucid, Inc.
   Copyright (C) 1995 Tinker Systems and INS Engineering Corp.

This file is part of the Lucid Widget Library.

The Lucid Widget Library is free software: you can redistribute it
and/or modify it under the terms of the GNU General Public License as
published by the Free Software Foundation, either version 3 of the
License, or (at your option) any later version.

The Lucid Widget Library is distributed in the hope that it will be
useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
General Public License for more details.

You should have received a copy of the GNU General Public License
along with the Lucid Widget Library.  If not, see
<http://www.gnu.org/licenses/>. */

#ifndef INCLUDED_lwlib_h_
#define INCLUDED_lwlib_h_

#include <X11/Intrinsic.h>
#include "xt-wrappers.h"

#if defined (LWLIB_MENUBARS_LUCID) || defined (LWLIB_MENUBARS_MOTIF) || defined (LWLIB_MENUBARS_ATHENA)
#define NEED_MENUBARS
#endif
#if defined (LWLIB_SCROLLBARS_LUCID) || defined (LWLIB_SCROLLBARS_MOTIF) || defined (LWLIB_SCROLLBARS_ATHENA)
#define NEED_SCROLLBARS
#endif
#if defined (LWLIB_DIALOGS_LUCID) || defined (LWLIB_DIALOGS_MOTIF) || defined (LWLIB_DIALOGS_ATHENA)
#define NEED_DIALOGS
#endif

/*
** 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>)
** CASCADE (button w/menu):
**           ("name" "string" "key" T/F  data (label|button|button w/menu...))
** INCREMENTAL (button w/menu construction callback):
**           ("name" "string" NULL  T/F  <opaque pointer>)
** menubar:  ("name" NULL     NULL  T/F  data (button w/menu))
** scrollbar:("name" NULL     NULL  T/F  NULL NULL)
** 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)
**
** Note that the above is EXTREMELY bogus.  The "type" of the various entities
** that a widget_value structure can represent is implicit in the contents of
** half a dozen slots, instead of there simply being a type field.  This
** should all be rethunk.  I've added a type field, but for now it's only used
** by the new xlwmenu code.
*/

typedef unsigned long LWLIB_ID;

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

typedef enum _widget_value_type
{
  UNSPECIFIED_TYPE = 0,
  BUTTON_TYPE = 1,
  TOGGLE_TYPE = 2,
  RADIO_TYPE = 3,
  TEXT_TYPE = 4,
  SEPARATOR_TYPE = 5,
  CASCADE_TYPE = 6,
  PUSHRIGHT_TYPE = 7,
  INCREMENTAL_TYPE = 8
} widget_value_type;

typedef enum _scroll_action
{
  SCROLLBAR_LINE_UP = 0,
  SCROLLBAR_LINE_DOWN = 1,
  SCROLLBAR_PAGE_UP = 2,
  SCROLLBAR_PAGE_DOWN = 3,
  SCROLLBAR_DRAG = 4,
  SCROLLBAR_CHANGE = 5,
  SCROLLBAR_TOP = 6,
  SCROLLBAR_BOTTOM = 7
} scroll_action;

typedef struct _scroll_event
{
  scroll_action action;
  int slider_value;
  Time time;
} scroll_event;

typedef struct _scrollbar_values
{
  int line_increment;
  int page_increment;

  int minimum;
  int maximum;

  int slider_size;
  int slider_position;

  int scrollbar_width, scrollbar_height;
  int scrollbar_x, scrollbar_y;
} scrollbar_values;

typedef struct _widget_args
{
  /* some things are only possible at creation time. args are applied
     to widgets at creation time.  */
  ArgList args;
  int	nargs;
  /* Copying args is impossible so we make the caller give us heap allocated
     args and free them when no one wants them any more. */
  int	ref_count;
  /* Since we are reference counting we need to be able to determine
     when something has changed. */
  Boolean	args_changed;
} widget_args;

typedef struct _widget_value
{
  /* This slot is only partially utilized right now. */
  widget_value_type type;

  /* name of widget */
  char*		name;
  /* value (meaning BOGUSLY depends on widget type) */
  char*		value;
  /* keyboard equivalent. no implications for XtTranslations */
  char*		key;
  /* accelerator key.  For XEmacs, this should be a Lisp_Object holding a
     char or symbol suitable for passing to event_matches_key_specifier_p.
     Outside of emacs, this can be anything: an X KeySym is a good idea.
     lwlib provides support functions for keyboard traversal of menus.  Actual
     implementation of those accelerators is up to the application.
     */
  XtPointer	accel;
  /* 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;
  /* Contents of sub-widgets, also selected slot for checkbox */
  struct _widget_value*	contents;
  /* data passed to callback */
  XtPointer	call_data;
  /* next in the list of siblings */
  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;

  /* data defining a scrollbar; only valid if type == "scrollbar" */
  scrollbar_values *scrollbar_data;

  /* A reference counted arg structure. */
  struct _widget_args *args;
  /* 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, XtPointer data);

/* menu stuff */
/* maybe this should go into a generic lwmenu.h */

extern int lw_menu_active;

#if defined (LWLIB_MENUBARS_LUCID)
#include "xlwmenu.h"
#define lw_set_menu xlw_set_menu
#define lw_push_menu xlw_push_menu
#define lw_pop_menu xlw_pop_menu
#define lw_set_item xlw_set_item
#define lw_map_menu xlw_map_menu
#define lw_display_menu xlw_display_menu
#define lw_kill_menus xlw_kill_menus
#define lw_get_entries xlw_get_entries
#define lw_menu_level xlw_menu_level
#else /* LWLIB_MENUBARS_LUCID */
/* do this for the other toolkits too */
#endif /* LWLIB_MENUBARS_LUCID */

#if defined (LWLIB_TABS_LUCID)
#include "xlwtabs.h"
#endif

void  lw_register_widget (const char* type, const 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 (const char* type, const 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);
int lw_map_widget_values (LWLIB_ID id, int (*mapfunc) (widget_value *value,
						       void *closure),
			  void *closure);
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);
void lw_add_value_args_to_args (widget_value* wv, ArgList addto, int* offset);
void lw_add_widget_value_arg (widget_value* wv, String name, XtArgVal value);
XtArgVal lw_get_value_arg (widget_value* wv, String name);
void lw_copy_widget_value_args (widget_value* copy, widget_value* val);
widget_value * copy_widget_value_tree (widget_value *val, change_type change);

widget_value *malloc_widget_value (void);
void free_widget_value (widget_value *);
void free_widget_value_tree (widget_value *wv);
widget_value *replace_widget_value_tree (widget_value*, widget_value*);

void lw_popup_menu (Widget, XEvent *);

/* 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);

void lw_remove_accelerator_spec (char *val);

#endif /* INCLUDED_lwlib_h_ */