termhooks.h 26.8 KB
Newer Older
1
/* Parameters and display hooks for terminal devices.
2

3
Copyright (C) 1985-1986, 1993-1994, 2001-2014 Free Software Foundation,
4
Inc.
Jim Blandy's avatar
Jim Blandy committed
5 6 7

This file is part of GNU Emacs.

8
GNU Emacs is free software: you can redistribute it and/or modify
Jim Blandy's avatar
Jim Blandy committed
9
it under the terms of the GNU General Public License as published by
10 11
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
Jim Blandy's avatar
Jim Blandy committed
12 13 14 15 16 17 18

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
19
along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
Jim Blandy's avatar
Jim Blandy committed
20

21 22 23
#ifndef EMACS_TERMHOOKS_H
#define EMACS_TERMHOOKS_H

24 25
/* Miscellanea.   */

26 27
#include "systime.h" /* for Time */

Paul Eggert's avatar
Paul Eggert committed
28
INLINE_HEADER_BEGIN
Jim Blandy's avatar
Jim Blandy committed
29

30
enum scroll_bar_part {
31
  scroll_bar_nowhere,
32 33
  scroll_bar_above_handle,
  scroll_bar_handle,
34 35
  scroll_bar_below_handle,
  scroll_bar_up_arrow,
Gerd Moellmann's avatar
Gerd Moellmann committed
36 37 38
  scroll_bar_down_arrow,
  scroll_bar_to_top,
  scroll_bar_to_bottom,
39
  scroll_bar_end_scroll,
40 41 42 43 44 45 46 47
  scroll_bar_move_ratio,
  scroll_bar_before_handle,
  scroll_bar_horizontal_handle,
  scroll_bar_after_handle,
  scroll_bar_left_arrow,
  scroll_bar_right_arrow,
  scroll_bar_to_leftmost,
  scroll_bar_to_rightmost
48 49
};

50 51 52 53 54 55 56 57 58 59 60 61
/* Output method of a terminal (and frames on this terminal, respectively).  */

enum output_method
{
  output_initial,
  output_termcap,
  output_x_window,
  output_msdos_raw,
  output_w32,
  output_ns
};

62
/* Input queue declarations and hooks.  */
63

64 65
enum event_kind
{
Pavel Janík's avatar
Pavel Janík committed
66
  NO_EVENT,			/* nothing happened.  This should never
Jim Blandy's avatar
Jim Blandy committed
67
				   actually appear in the event queue.  */
Jim Blandy's avatar
Jim Blandy committed
68

Pavel Janík's avatar
Pavel Janík committed
69
  ASCII_KEYSTROKE_EVENT,	/* The ASCII code is in .code, perhaps
Jim Blandy's avatar
Jim Blandy committed
70 71 72
				   with modifiers applied.
				   .modifiers holds the state of the
				   modifier keys.
73 74
				   .frame_or_window is the frame in
				   which the key was typed.
Jim Blandy's avatar
Jim Blandy committed
75 76
				   .timestamp gives a timestamp (in
				   milliseconds) for the keystroke.  */
Pavel Janík's avatar
Pavel Janík committed
77
  MULTIBYTE_CHAR_KEYSTROKE_EVENT,	/* The multibyte char code is in .code,
78 79
				   perhaps with modifiers applied.
				   The others are the same as
Dave Love's avatar
Dave Love committed
80
				   ASCII_KEYSTROKE_EVENT.  */
Pavel Janík's avatar
Pavel Janík committed
81
  NON_ASCII_KEYSTROKE_EVENT,	/* .code is a number identifying the
Jim Blandy's avatar
Jim Blandy committed
82 83 84 85 86 87
				   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
Jim Blandy's avatar
Jim Blandy committed
88
				   modifier keys.
89 90
				   .frame_or_window is the frame in
				   which the key was typed.
Jim Blandy's avatar
Jim Blandy committed
91 92
				   .timestamp gives a timestamp (in
				   milliseconds) for the keystroke.  */
Pavel Janík's avatar
Pavel Janík committed
93 94
  TIMER_EVENT,                  /* A timer fired.  */
  MOUSE_CLICK_EVENT,		/* The button number is in .code; it must
95 96
				   be >= 0 and < NUM_MOUSE_BUTTONS, defined
				   below.
Jim Blandy's avatar
Jim Blandy committed
97 98 99
				   .modifiers holds the state of the
				   modifier keys.
				   .x and .y give the mouse position,
Jim Blandy's avatar
Jim Blandy committed
100
				   in characters, within the window.
101 102
				   .frame_or_window gives the frame
				   the mouse click occurred in.
Jim Blandy's avatar
Jim Blandy committed
103 104
				   .timestamp gives a timestamp (in
				   milliseconds) for the click.  */
105 106 107 108 109 110 111 112 113 114 115 116
  WHEEL_EVENT,			/* A wheel event is generated by a
				   wheel on a mouse (e.g., MS
				   Intellimouse).
				   .modifiers holds the rotate
				   direction (up or down), and the
				   state of the modifier keys.
				   .x and .y give the mouse position,
				   in characters, within the window.
				   .frame_or_window gives the frame
				   the wheel event occurred in.
				   .timestamp gives a timestamp (in
				   milliseconds) for the event.  */
117 118 119
  HORIZ_WHEEL_EVENT,            /* A wheel event generated by a second
                                   horizontal wheel that is present on some
                                   mice. See WHEEL_EVENT.  */
120
#ifdef HAVE_NTGUI
121
  LANGUAGE_CHANGE_EVENT,	/* A LANGUAGE_CHANGE_EVENT is
Daniel Colascione's avatar
Daniel Colascione committed
122
				   generated when HAVE_NTGUI or on Mac OS
123 124
				   when the keyboard layout or input
				   language is changed by the
125
				   user.  */
126
#endif
Pavel Janík's avatar
Pavel Janík committed
127
  SCROLL_BAR_CLICK_EVENT,	/* .code gives the number of the mouse button
128 129 130
				   that was clicked.
				   .modifiers holds the state of the modifier
				   keys.
Jim Blandy's avatar
Jim Blandy committed
131
				   .part is a lisp symbol indicating which
132
				   part of the scroll bar got clicked.
133 134 135
				   .x gives the distance from the start of the
				   scroll bar of the click; .y gives the total
				   length of the scroll bar.
136
				   .frame_or_window gives the window
137
				   whose scroll bar was clicked in.
Jim Blandy's avatar
Jim Blandy committed
138 139
				   .timestamp gives a timestamp (in
				   milliseconds) for the click.  */
140 141 142 143 144 145 146 147 148 149 150 151 152
  HORIZONTAL_SCROLL_BAR_CLICK_EVENT,	/* .code gives the number of the mouse button
				   that was clicked.
				   .modifiers holds the state of the modifier
				   keys.
				   .part is a lisp symbol indicating which
				   part of the scroll bar got clicked.
				   .x gives the distance from the start of the
				   scroll bar of the click; .y gives the total
				   length of the scroll bar.
				   .frame_or_window gives the window
				   whose scroll bar was clicked in.
				   .timestamp gives a timestamp (in
				   milliseconds) for the click.  */
Pavel Janík's avatar
Pavel Janík committed
153
  SELECTION_REQUEST_EVENT,	/* Another X client wants a selection from us.
154
				   See `struct selection_input_event'.  */
Pavel Janík's avatar
Pavel Janík committed
155 156 157
  SELECTION_CLEAR_EVENT,	/* Another X client cleared our selection.  */
  BUFFER_SWITCH_EVENT,		/* A process filter has switched buffers.  */
  DELETE_WINDOW_EVENT,		/* An X client said "delete this window".  */
158
  MENU_BAR_EVENT,		/* An event generated by the menu bar.
159
				   The frame_or_window field's cdr holds the
160 161
				   Lisp-level event value.
				   (Only the toolkit version uses these.)  */
Pavel Janík's avatar
Pavel Janík committed
162 163 164
  ICONIFY_EVENT,		/* An X client iconified this window.  */
  DEICONIFY_EVENT,		/* An X client deiconified this window.  */
  MENU_BAR_ACTIVATE_EVENT,      /* A button press in the menu bar
165
				   (toolkit version only).  */
Pavel Janík's avatar
Pavel Janík committed
166
  DRAG_N_DROP_EVENT,		/* A drag-n-drop event is generated when
167 168
				   files selected outside of Emacs are dropped
				   onto an Emacs window.
169
				   .modifiers holds the state of the
170 171 172
				   modifier keys.
				   .x and .y give the mouse position,
				   in characters, within the window.
173 174 175 176
				   .frame_or_window is the frame in
				   which the drop was made.
				   .arg is a platform-dependent
				   representation of the dropped items.
177 178
				   .timestamp gives a timestamp (in
				   milliseconds) for the click.  */
179 180
  USER_SIGNAL_EVENT,		/* A user signal.
                                   code is a number identifying it,
Gerd Moellmann's avatar
Gerd Moellmann committed
181 182
                                   index into lispy_user_signals.  */

183 184 185
  /* Help events.  Member `frame_or_window' of the input_event is the
     frame on which the event occurred, and member `arg' contains
     the help to show.  */
Gerd Moellmann's avatar
Gerd Moellmann committed
186 187
  HELP_EVENT,

188 189 190
  /* An event from a tool-bar.  Member `arg' of the input event
     contains the tool-bar item selected.  If `frame_or_window'
     and `arg' are equal, this is a prefix event.  */
191 192 193 194
  TOOL_BAR_EVENT,

  /* Queued from XTread_socket on FocusIn events.  Translated into
     `switch-frame' events in kbd_buffer_get_event, if necessary.  */
195 196
  FOCUS_IN_EVENT,

197 198
  FOCUS_OUT_EVENT,

199 200 201
  /* Generated when mouse moves over window not currently selected.  */
  SELECT_WINDOW_EVENT,

202 203
  /* Queued from XTread_socket when session manager sends
     save yourself before shutdown. */
204
  SAVE_SESSION_EVENT
205

206
#ifdef HAVE_GPM
Miles Bader's avatar
Miles Bader committed
207
  , GPM_CLICK_EVENT
208 209
#endif

210 211 212 213
#ifdef HAVE_DBUS
  , DBUS_EVENT
#endif

214 215
  , CONFIG_CHANGED_EVENT

Daniel Colascione's avatar
Daniel Colascione committed
216
#ifdef HAVE_NTGUI
217 218 219 220 221 222 223 224 225 226 227 228
  /* Generated when an APPCOMMAND event is received, in response to
     Multimedia or Internet buttons on some keyboards.
     Such keys are available as normal function keys on X through the
     Xkeyboard extension.
     On Windows, some of them get mapped to normal function key events,
     but others need to be handled by APPCOMMAND. Handling them all as
     APPCOMMAND events means they can be disabled
     (w32-pass-multimedia-buttons-to-system), important on Windows since
     the system never sees these keys if Emacs claims to handle them.
     On X, the window manager seems to grab the keys it wants
     first, so this is not a problem there.  */
  , MULTIMEDIA_KEY_EVENT
229
#endif
230 231 232 233 234

#ifdef HAVE_NS
  /* Generated when native multi-keystroke input method is used to modify
     tentative or indicative text display. */
  , NS_TEXT_EVENT
235 236
  /* Non-key system events (e.g. application menu events) */
  , NS_NONKEY_EVENT
237 238
#endif

239
#ifdef USE_FILE_NOTIFY
240 241 242 243
  /* File or directory was changed.  */
  , FILE_NOTIFY_EVENT
#endif

244 245
};

Pavel Janík's avatar
Pavel Janík committed
246 247
/* If a struct input_event has a kind which is SELECTION_REQUEST_EVENT
   or SELECTION_CLEAR_EVENT, then its contents are really described
248
   by `struct selection_input_event'; see xterm.h.  */
249 250 251 252 253 254

/* 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.  */

255 256
struct input_event
{
257
  /* What kind of event was this?  */
258 259 260 261
  ENUM_BF (event_kind) kind : 16;

  /* Used in scroll back click events.  */
  ENUM_BF (scroll_bar_part) part : 16;
262

Pavel Janík's avatar
Pavel Janík committed
263 264 265
  /* For an ASCII_KEYSTROKE_EVENT and MULTIBYTE_CHAR_KEYSTROKE_EVENT,
     this is the character.
     For a NON_ASCII_KEYSTROKE_EVENT, this is the keysym code.
266 267
     For a mouse event, this is the button number.  */
  unsigned code;
268

269 270
  /* See enum below for interpretation.  */
  unsigned modifiers;
271

272 273
  /* One would prefer C integers, but HELP_EVENT uses these to
     record frame or window object and a help form, respectively.  */
274
  Lisp_Object x, y;
275 276 277 278

  /* Usually a time as reported by window system-specific event loop.
     For a HELP_EVENT, this is the position within the object (stored
     in ARG below) where the help was found.  */
279
  Time timestamp;
280

281 282
  /* This field is copied into a vector while the event is in
     the queue, so that garbage collections won't kill it.  */
283
  Lisp_Object frame_or_window;
284

285 286 287
  /* This additional argument is used in attempt to avoid extra consing
     when building events.  Unfortunately some events have to pass much
     more data than it's reasonable to pack directly into this structure.  */
288
  Lisp_Object arg;
Jim Blandy's avatar
Jim Blandy committed
289
};
Andreas Schwab's avatar
Andreas Schwab committed
290

291
#define EVENT_INIT(event) memset (&(event), 0, sizeof (struct input_event))
Stefan Monnier's avatar
Stefan Monnier committed
292

293 294
/* Bits in the modifiers member of the input_event structure.
   Note that reorder_modifiers assumes that the bits are in canonical
295
   order.
296 297 298

   The modifiers applied to mouse clicks are rather ornate.  The
   window-system-specific code should store mouse clicks with
Jim Blandy's avatar
Jim Blandy committed
299 300 301 302 303 304
   up_modifier or down_modifier set.  Having an explicit down modifier
   simplifies some of window-system-independent code; without it, the
   code would have to recognize down events by checking if the event
   is a mouse click lacking the click and drag modifiers.

   The window-system independent code turns all up_modifier events
305 306 307 308 309
   bits into drag_modifier, click_modifier, double_modifier, or
   triple_modifier events.  The click_modifier has no written
   representation in the names of the symbols used as event heads,
   but it does appear in the Qevent_symbol_components property of the
   event heads.  */
Jim Blandy's avatar
Jim Blandy committed
310
enum {
311 312 313
  up_modifier	=   1,		/* Only used on mouse buttons - always
				   turned into a click or a drag modifier
				   before lisp code sees the event.  */
314 315
  down_modifier =   2,		/* Only used on mouse buttons.  */
  drag_modifier =   4,		/* This is never used in the event
316 317
				   queue; it's only used internally by
				   the window-system-independent code.  */
318
  click_modifier=   8,		/* See drag_modifier.  */
319 320
  double_modifier= 16,          /* See drag_modifier.  */
  triple_modifier= 32,          /* See drag_modifier.  */
321 322 323 324

  /* The next four modifier bits are used also in keyboard events at
     the Lisp level.

Paul Eggert's avatar
Paul Eggert committed
325
     It's probably not the greatest idea to use the 2^28 bit for any
326
     modifier.  It may or may not be the sign bit, depending on
Paul Eggert's avatar
Paul Eggert committed
327
     FIXNUM_BITS, so using it to represent a modifier key means that
328 329
     characters thus modified have different integer equivalents
     depending on the architecture they're running on.  Oh, and
Paul Eggert's avatar
Paul Eggert committed
330
     applying XINT to a character whose 2^28 bit is set might sign-extend
331 332 333 334 335 336 337 338
     it, so you get a bunch of bits in the mask you didn't want.

     The CHAR_ macros are defined in lisp.h.  */
  alt_modifier	=  CHAR_ALT,	/* Under X, the XK_Alt_[LR] keysyms.  */
  super_modifier=  CHAR_SUPER,	/* Under X, the XK_Super_[LR] keysyms.  */
  hyper_modifier=  CHAR_HYPER,	/* Under X, the XK_Hyper_[LR] keysyms.  */
  shift_modifier=  CHAR_SHIFT,
  ctrl_modifier	=  CHAR_CTL,
339
  meta_modifier	=  CHAR_META	/* Under X, the XK_Meta_[LR] keysyms.  */
Jim Blandy's avatar
Jim Blandy committed
340 341
};

342
#ifdef HAVE_GPM
343
#include <gpm.h>
Miles Bader's avatar
Miles Bader committed
344
extern int handle_one_term_event (struct tty_display_info *, Gpm_Event *, struct input_event *);
345
#ifndef HAVE_WINDOW_SYSTEM
346
extern void term_mouse_moveto (int, int);
347
#endif
348

349 350
/* The device for which we have enabled gpm support.  */
extern struct tty_display_info *gpm_tty;
Miles Bader's avatar
Miles Bader committed
351 352
#endif

353 354
/* Terminal-local parameters. */
struct terminal
355
{
356
  /* This is for Lisp; the terminal code does not refer to it.  */
357
  struct vectorlike_header header;
358

359 360 361
  /* Parameter alist of this terminal.  */
  Lisp_Object param_alist;

362 363 364 365 366
  /* List of charsets supported by the terminal.  It is set by
     Fset_terminal_coding_system_internal along with
     the member terminal_coding.  */
  Lisp_Object charset_list;

Chong Yidong's avatar
Chong Yidong committed
367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382
  /* This is an association list containing the X selections that
     Emacs might own on this terminal.  Each element has the form
       (SELECTION-NAME SELECTION-VALUE SELECTION-TIMESTAMP FRAME)
     SELECTION-NAME is a lisp symbol, whose name is the name of an X Atom.
     SELECTION-VALUE is the value that emacs owns for that selection.
      It may be any kind of Lisp object.
     SELECTION-TIMESTAMP is the time at which emacs began owning this
      selection, as a cons of two 16-bit numbers (making a 32 bit
      time.)
     FRAME is the frame for which we made the selection.  If there is
      an entry in this alist, then it can be assumed that Emacs owns
      that selection.
     The only (eq) parts of this list that are visible from Lisp are
    the selection-values.  */
  Lisp_Object Vselection_alist;

383 384
  /* All fields before `next_terminal' should be Lisp_Object and are traced
     by the GC.  All fields afterwards are ignored by the GC.  */
385

386 387
  /* Chain of all terminal devices. */
  struct terminal *next_terminal;
388

389
  /* Unique id for this terminal device. */
390 391
  int id;

392
  /* The number of frames that are on this terminal. */
393
  int reference_count;
394

395
  /* The type of the terminal device. */
396 397
  enum output_method type;

398 399 400
  /* The name of the terminal device.  Do not use this to uniquely
     identify a terminal; the same device may be opened multiple
     times. */
401 402
  char *name;

403
  /* The terminal's keyboard object. */
404 405
  struct kboard *kboard;

406 407 408 409 410
#ifdef HAVE_WINDOW_SYSTEM
  /* Cache of images.  */
  struct image_cache *image_cache;
#endif /* HAVE_WINDOW_SYSTEM */

411
  /* Device-type dependent data shared amongst all frames on this terminal.  */
412 413 414 415
  union display_info
  {
    struct tty_display_info *tty;     /* termchar.h */
    struct x_display_info *x;         /* xterm.h */
416
    struct w32_display_info *w32;     /* w32term.h */
417
    struct ns_display_info *ns;       /* nsterm.h */
418 419 420
  } display_info;


421 422 423 424 425 426 427 428 429 430 431
  /* Coding-system to be used for encoding terminal output.  This
     structure contains information of a coding-system specified by
     the function `set-terminal-coding-system'.  Also see
     `safe_terminal_coding' in coding.h.  */
  struct coding_system *terminal_coding;

  /* Coding-system of what is sent from terminal keyboard.  This
     structure contains information of a coding-system specified by
     the function `set-keyboard-coding-system'.  */
  struct coding_system *keyboard_coding;

432 433 434 435 436
  /* Window-based redisplay interface for this device (0 for tty
     devices). */
  struct redisplay_interface *rif;

  /* Frame-based redisplay interface. */
437

438 439
  /* Text display hooks.  */

Jan D's avatar
Jan D committed
440 441
  void (*cursor_to_hook) (struct frame *f, int vpos, int hpos);
  void (*raw_cursor_to_hook) (struct frame *, int, int);
442

Jan D's avatar
Jan D committed
443 444 445
  void (*clear_to_end_hook) (struct frame *);
  void (*clear_frame_hook) (struct frame *);
  void (*clear_end_of_line_hook) (struct frame *, int);
446

Jan D's avatar
Jan D committed
447
  void (*ins_del_lines_hook) (struct frame *f, int, int);
448

Jan D's avatar
Jan D committed
449 450 451
  void (*insert_glyphs_hook) (struct frame *f, struct glyph *s, int n);
  void (*write_glyphs_hook) (struct frame *f, struct glyph *s, int n);
  void (*delete_glyphs_hook) (struct frame *, int);
452

Jan D's avatar
Jan D committed
453 454
  void (*ring_bell_hook) (struct frame *f);
  void (*toggle_invisible_pointer_hook) (struct frame *f, int invisible);
455

Jan D's avatar
Jan D committed
456 457
  void (*reset_terminal_modes_hook) (struct terminal *);
  void (*set_terminal_modes_hook) (struct terminal *);
Karoly Lorentey's avatar
Karoly Lorentey committed
458

Jan D's avatar
Jan D committed
459 460 461
  void (*update_begin_hook) (struct frame *);
  void (*update_end_hook) (struct frame *);
  void (*set_terminal_window_hook) (struct frame *, int);
462 463 464 465 466 467 468 469

  /* Multi-frame and mouse support hooks.  */

  /* Return the current position of the mouse.

     Set *f to the frame the mouse is in, or zero if the mouse is in no
     Emacs frame.  If it is set to zero, all the other arguments are
     garbage.
470

471 472 473 474 475 476 477 478
     If the motion started in a scroll bar, set *bar_window to the
     scroll bar's window, *part to the part the mouse is currently over,
     *x to the position of the mouse along the scroll bar, and *y to the
     overall length of the scroll bar.

     Otherwise, set *bar_window to Qnil, and *x and *y to the column and
     row of the character cell the mouse is over.

479
     Set *time to the time the mouse was at the returned position.  */
Jan D's avatar
Jan D committed
480 481 482 483 484
  void (*mouse_position_hook) (struct frame **f, int,
                               Lisp_Object *bar_window,
                               enum scroll_bar_part *part,
                               Lisp_Object *x,
                               Lisp_Object *y,
485
                               Time *);
486 487 488 489

  /* When a frame's focus redirection is changed, this hook tells the
     window system code to re-decide where to put the highlight.  Under
     X, this means that Emacs lies about where the focus is.  */
Jan D's avatar
Jan D committed
490
  void (*frame_rehighlight_hook) (struct frame *);
491 492 493 494

  /* If we're displaying frames using a window system that can stack
     frames on top of each other, this hook allows you to bring a frame
     to the front, or bury it behind all the other windows.  If this
495
     hook is zero, that means the terminal we're displaying on doesn't
496 497
     support overlapping frames, so there's no need to raise or lower
     anything.
498

499 500
     If RAISE_FLAG is non-zero, F is brought to the front, before all other
     windows.  If RAISE_FLAG is zero, F is sent to the back, behind all other
501
     windows.  */
502
  void (*frame_raise_lower_hook) (struct frame *f, int raise_flag);
503

504
  /* If the value of the frame parameter changed, this hook is called.
505 506
     For example, if going from fullscreen to not fullscreen this hook
     may do something OS dependent, like extended window manager hints on X11.  */
Jan D's avatar
Jan D committed
507
  void (*fullscreen_hook) (struct frame *f);
508

509 510 511 512
  /* This hook is called to display menus.  */
  Lisp_Object (*menu_show_hook) (struct frame *f, int x, int y, int menuflags,
				 Lisp_Object title, const char **error_name);

513 514 515 516
  /* This hook is called to display popup dialog.  */
  Lisp_Object (*popup_dialog_hook) (struct frame *f, Lisp_Object header,
				    Lisp_Object contents);

517 518 519 520 521 522 523
  /* Scroll bar hooks.  */

  /* The representation of scroll bars is determined by the code which
     implements them, except for one thing: they must be represented by
     lisp objects.  This allows us to place references to them in
     Lisp_Windows without worrying about those references becoming
     dangling references when the scroll bar is destroyed.
524

525 526 527 528
     The window-system-independent portion of Emacs just refers to
     scroll bars via their windows, and never looks inside the scroll bar
     representation; it always uses hook functions to do all the
     scroll bar manipulation it needs.
529

530 531 532
     The `vertical_scroll_bar' field of a Lisp_Window refers to that
     window's scroll bar, or is nil if the window doesn't have a
     scroll bar.
533

534 535 536
     The `scroll_bars' and `condemned_scroll_bars' fields of a Lisp_Frame
     are free for use by the scroll bar implementation in any way it sees
     fit.  They are marked by the garbage collector.  */
537 538


539 540 541 542 543
  /* Set the vertical scroll bar for WINDOW to have its upper left corner
     at (TOP, LEFT), and be LENGTH rows high.  Set its handle to
     indicate that we are displaying PORTION characters out of a total
     of WHOLE characters, starting at POSITION.  If WINDOW doesn't yet
     have a scroll bar, create one for it.  */
Jan D's avatar
Jan D committed
544 545 546
  void (*set_vertical_scroll_bar_hook) (struct window *window,
                                        int portion, int whole,
                                        int position);
547 548


549 550 551 552 553 554 555 556 557 558
  /* Set the horizontal scroll bar for WINDOW to have its upper left
     corner at (TOP, LEFT), and be LENGTH rows high.  Set its handle to
     indicate that we are displaying PORTION characters out of a total
     of WHOLE characters, starting at POSITION.  If WINDOW doesn't yet
     have a scroll bar, create one for it.  */
  void (*set_horizontal_scroll_bar_hook) (struct window *window,
					  int portion, int whole,
					  int position);


559 560 561 562 563 564 565
  /* The following three hooks are used when we're doing a thorough
     redisplay of the frame.  We don't explicitly know which scroll bars
     are going to be deleted, because keeping track of when windows go
     away is a real pain - can you say set-window-configuration?
     Instead, we just assert at the beginning of redisplay that *all*
     scroll bars are to be removed, and then save scroll bars from the
     fiery pit when we actually redisplay their window.  */
566

567 568
  /* Arrange for all scroll bars on FRAME to be removed at the next call
     to `*judge_scroll_bars_hook'.  A scroll bar may be spared if
Paul Eggert's avatar
Paul Eggert committed
569
     `*redeem_scroll_bar_hook' is applied to its window before the judgment.
570

571 572 573 574
     This should be applied to each frame each time its window tree is
     redisplayed, even if it is not displaying scroll bars at the moment;
     if the HAS_SCROLL_BARS flag has just been turned off, only calling
     this and the judge_scroll_bars_hook will get rid of them.
575

576 577 578
     If non-zero, this hook should be safe to apply to any frame,
     whether or not it can support scroll bars, and whether or not it is
     currently displaying them.  */
Jan D's avatar
Jan D committed
579
  void (*condemn_scroll_bars_hook) (struct frame *frame);
580

Paul Eggert's avatar
Paul Eggert committed
581
  /* Unmark WINDOW's scroll bar for deletion in this judgment cycle.
582
     Note that it's okay to redeem a scroll bar that is not condemned.  */
Jan D's avatar
Jan D committed
583
  void (*redeem_scroll_bar_hook) (struct window *window);
584 585 586 587 588 589 590 591

  /* Remove all scroll bars on FRAME that haven't been saved since the
     last call to `*condemn_scroll_bars_hook'.

     This should be applied to each frame after each time its window
     tree is redisplayed, even if it is not displaying scroll bars at the
     moment; if the HAS_SCROLL_BARS flag has just been turned off, only
     calling this and condemn_scroll_bars_hook will get rid of them.
592

593 594 595
     If non-zero, this hook should be safe to apply to any frame,
     whether or not it can support scroll bars, and whether or not it is
     currently displaying them.  */
Jan D's avatar
Jan D committed
596
  void (*judge_scroll_bars_hook) (struct frame *FRAME);
597 598


599 600
  /* Called to read input events.

601
     TERMINAL indicates which terminal device to read from.  Input
602
     events should be read into HOLD_QUIT.
603 604

     A positive return value indicates that that many input events
605
     were read into BUF.
606 607
     Zero means no events were immediately available.
     A value of -1 means a transient read error, while -2 indicates
608
     that the device was closed (hangup), and it should be deleted.  */
Jan D's avatar
Jan D committed
609 610
  int (*read_socket_hook) (struct terminal *terminal,
                           struct input_event *hold_quit);
611 612

  /* Called when a frame's display becomes entirely up to date.  */
Jan D's avatar
Jan D committed
613
  void (*frame_up_to_date_hook) (struct frame *);
614 615 616


  /* Called to delete the device-specific portions of a frame that is
617
     on this terminal device. */
Jan D's avatar
Jan D committed
618
  void (*delete_frame_hook) (struct frame *);
619

620
  /* Called after the last frame on this terminal is deleted, or when
621
     the display device was closed (hangup).
622

623 624
     If this is NULL, then the generic delete_terminal is called
     instead.  Otherwise the hook must call delete_terminal itself.
625

626
     The hook must check for and close any live frames that are still
627
     on the terminal.  delete_frame ensures that there are no live
628
     frames on the terminal when it calls this hook, so infinite
629
     recursion is prevented.  */
Jan D's avatar
Jan D committed
630
  void (*delete_terminal_hook) (struct terminal *);
631 632
};

Paul Eggert's avatar
Paul Eggert committed
633 634
/* Most code should use these functions to set Lisp fields in struct
   terminal.  */
Paul Eggert's avatar
Paul Eggert committed
635
INLINE void
Paul Eggert's avatar
Paul Eggert committed
636 637 638 639
tset_charset_list (struct terminal *t, Lisp_Object val)
{
  t->charset_list = val;
}
Paul Eggert's avatar
Paul Eggert committed
640
INLINE void
Paul Eggert's avatar
Paul Eggert committed
641 642 643 644
tset_selection_alist (struct terminal *t, Lisp_Object val)
{
  t->Vselection_alist = val;
}
645

646
/* Chain of all terminal devices currently in use.  */
647
extern struct terminal *terminal_list;
648

649 650 651 652 653 654
#define FRAME_MUST_WRITE_SPACES(f) (FRAME_TTY (f)->must_write_spaces)
#define FRAME_LINE_INS_DEL_OK(f) (FRAME_TTY (f)->line_ins_del_ok)
#define FRAME_CHAR_INS_DEL_OK(f) (FRAME_TTY (f)->char_ins_del_ok)
#define FRAME_SCROLL_REGION_OK(f) (FRAME_TTY (f)->scroll_region_ok)
#define FRAME_SCROLL_REGION_COST(f) (FRAME_TTY (f)->scroll_region_cost)
#define FRAME_MEMORY_BELOW_FRAME(f) (FRAME_TTY (f)->memory_below_frame)
655

656 657
#define FRAME_TERMINAL_CODING(f) ((f)->terminal->terminal_coding)
#define FRAME_KEYBOARD_CODING(f) ((f)->terminal->keyboard_coding)
658

659 660
#define TERMINAL_TERMINAL_CODING(d) ((d)->terminal_coding)
#define TERMINAL_KEYBOARD_CODING(d) ((d)->keyboard_coding)
661

662
#define FRAME_RIF(f) ((f)->terminal->rif)
663

664
#define FRAME_TERMINAL(f) ((f)->terminal)
665

666 667 668 669
/* Return true if the terminal device is not suspended.  */
#define TERMINAL_ACTIVE_P(d)						\
  (((d)->type != output_termcap && (d)->type != output_msdos_raw)	\
   || (d)->display_info.tty->input)
670

671 672 673 674 675 676 677 678 679 680 681 682 683
/* Return font cache data for the specified terminal.  The historical
   name is grossly misleading, actually it is (NAME . FONT-LIST-CACHE).  */
#if defined (HAVE_X_WINDOWS)
#define TERMINAL_FONT_CACHE(t)						\
  (t->type == output_x_window ? t->display_info.x->name_list_element : Qnil)
#elif defined (HAVE_NTGUI)
#define TERMINAL_FONT_CACHE(t)						\
  (t->type == output_w32 ? t->display_info.w32->name_list_element : Qnil)
#elif defined (HAVE_NS)
#define TERMINAL_FONT_CACHE(t)						\
  (t->type == output_ns ? t->display_info.ns->name_list_element : Qnil)
#endif

684
extern struct terminal *get_terminal (Lisp_Object terminal, bool);
685 686
extern struct terminal *create_terminal (enum output_method,
					 struct redisplay_interface *);
Jan D's avatar
Jan D committed
687
extern void delete_terminal (struct terminal *);
688

689
/* The initial terminal device, created by initial_term_init.  */
690
extern struct terminal *initial_terminal;
691

692 693 694
extern unsigned char *encode_terminal_code (struct glyph *, int,
					    struct coding_system *);

695
#ifdef HAVE_GPM
696
extern void close_gpm (int gpm_fd);
697
#endif
698 699

#ifdef WINDOWSNT
Eli Zaretskii's avatar
Eli Zaretskii committed
700 701 702 703 704
extern int cursorX (struct tty_display_info *);
extern int cursorY (struct tty_display_info *);
#else
#define cursorX(t)  curX(t)
#define cursorY(t)  curY(t)
705 706
#endif

Paul Eggert's avatar
Paul Eggert committed
707
INLINE_HEADER_END
708 709

#endif /* EMACS_TERMHOOKS_H */