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/* Hooks by which low level terminal operations
   can be made to call other routines.
   Copyright (C) 1985, 1986 Free Software Foundation, Inc.

This file is part of GNU Emacs.

GNU Emacs 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 1, or (at your option)
any later version.

GNU Emacs 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 GNU Emacs; see the file COPYING.  If not, write to
the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */


extern int (*cursor_to_hook) ();
extern int (*raw_cursor_to_hook) ();

extern int (*clear_to_end_hook) ();
extern int (*clear_screen_hook) ();
extern int (*clear_end_of_line_hook) ();

extern int (*ins_del_lines_hook) ();

extern int (*change_line_highlight_hook) ();
extern int (*reassert_line_highlight_hook) ();

extern int (*insert_glyphs_hook) ();
extern int (*write_glyphs_hook) ();
extern int (*delete_glyphs_hook) ();

extern int (*ring_bell_hook) ();

extern int (*reset_terminal_modes_hook) ();
extern int (*set_terminal_modes_hook) ();
extern int (*update_begin_hook) ();
extern int (*update_end_hook) ();
extern int (*set_terminal_window_hook) ();

extern int (*read_socket_hook) ();

/* Hook for Emacs to call to tell the window-system-specific code to
   enable/disable low-level tracking.  The value of ENABLE tells the
   window system event handler whether it should notice or ignore
   subsequent mouse movement and mouse button releases.

   If this is 0, Emacs should assume that there is no mouse (or at
   least no mouse tracking) available.

   If called with ENABLE non-zero, the window system event handler
   should call set_pointer_loc with the new mouse co-ordinates
   whenever the mouse moves, and enqueue a mouse button event for
   button releases as well as button presses.

   If called with ENABLE zero, the window system event handler should
   ignore mouse movement events, and not enqueue events for mouse
   button releases.  */
extern int (*mouse_tracking_enable_hook) ( /* int ENABLE */ );

/* If nonzero, send all terminal output characters to this stream also.  */

extern FILE *termscript;

#ifdef XINT
/* Expedient hack: only provide the below definitions to files that
   are prepared to handle lispy things.  XINT is defined iff lisp.h
   has been included in the file before this file.  */

/* The keyboard input buffer is an array of these structures.  Each one
   represents some sort of input event - a keystroke, a mouse click, or
   a window system event.  These get turned into their lispy forms when
   they are removed from the event queue.  */

struct input_event {

  /* What kind of event was this?  */
  enum {
    no_event,			/* nothing happened.  This should never
				   actually appear in the event queue.  */
    ascii_keystroke,		/* The ASCII code is in .code.  Note that
				   this includes meta-keys, and the modifiers
				   field of the event is unused.  */
    non_ascii_keystroke,	/* .code is a number identifying the
				   function key.  A code N represents
				   a key whose name is
				   function_key_names[N]; function_key_names
				   is a table in keyboard.c to which you
				   should feel free to add missing keys.
				   .modifiers holds the state of the
				   modifier keys.  */
    mouse_click,		/* The button number is in .code.
				   .modifiers holds the state of the
				   modifier keys.
				   .x and .y give the mouse position,
				   in pixels, within the window.
				   .screen gives the screen the mouse
				   click occurred in.
				   .timestamp gives a timestamp (in
				   milliseconds) for the click.  */
    scrollbar_click,		/* .code gives the number of the mouse
				   button that was clicked.
				   .part is a lisp symbol indicating which
				   part of the scrollbar got clicked.  This
				   indicates whether the scroll bar was
				   horizontal or vertical.
				   .modifiers gives the state of the
				   modifier keys.
				   .x gives the distance from the start
				   of the scroll bar of the click; .y gives
				   the total length of the scroll bar.
				   .screen gives the screen the click
				   should apply to.
				   .timestamp gives a timestamp (in
				   milliseconds) for the click.  */
    screen_selected,		/* The user has moved the focus to another
				   screen.
				   .screen is the screen that should become
				   selected at the next convenient time.  */
  } kind;
  
  Lisp_Object code;
  Lisp_Object part;
  struct screen *screen;
  int modifiers;		/* See enum below for interpretation.  */
  Lisp_Object x, y;
  Lisp_Object timestamp;
};

/* Bits in the modifiers member of the input_event structure.  */
enum {
  shift_modifier = 1,
  ctrl_modifier = 2,
  meta_modifier = 4,
  up_modifier = 8,		/* This only applies to mouse buttons.  */
  last_modifier			/* This should always be one more than the
				   highest modifier bit defined.  */
};

#define NUM_MODIFIER_COMBOS ((last_modifier-1) << 1)

#endif