termhooks.h 26.2 KB
Newer Older
1
/* Parameters and display hooks for terminal devices.
2 3

Copyright (C) 1985-1986, 1993-1994, 2001-2011  Free Software Foundation, Inc.
Jim Blandy's avatar
Jim Blandy committed
4 5 6

This file is part of GNU Emacs.

7
GNU Emacs is free software: you can redistribute it and/or modify
Jim Blandy's avatar
Jim Blandy committed
8
it under the terms of the GNU General Public License as published by
9 10
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
Jim Blandy's avatar
Jim Blandy committed
11 12 13 14 15 16 17

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
18
along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
Jim Blandy's avatar
Jim Blandy committed
19

20 21 22

/* Miscellanea.   */

23 24
#include "systime.h" /* for Time */

Gerd Moellmann's avatar
Gerd Moellmann committed
25 26
struct glyph;
struct frame;
27

Jim Blandy's avatar
Jim Blandy committed
28

29 30 31
enum scroll_bar_part {
  scroll_bar_above_handle,
  scroll_bar_handle,
32 33
  scroll_bar_below_handle,
  scroll_bar_up_arrow,
Gerd Moellmann's avatar
Gerd Moellmann committed
34 35 36
  scroll_bar_down_arrow,
  scroll_bar_to_top,
  scroll_bar_to_bottom,
37 38
  scroll_bar_end_scroll,
  scroll_bar_move_ratio
39 40
};

Jan Djärv's avatar
Jan Djärv committed
41 42 43
/* If the value of the frame parameter changed, whis hook is called.
   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
44
extern void (*fullscreen_hook) (struct frame *f);
Jan Djärv's avatar
Jan Djärv committed
45

46 47

/* Input queue declarations and hooks.  */
48

49 50
enum event_kind
{
Pavel Janík's avatar
Pavel Janík committed
51
  NO_EVENT,			/* nothing happened.  This should never
Jim Blandy's avatar
Jim Blandy committed
52
				   actually appear in the event queue.  */
Jim Blandy's avatar
Jim Blandy committed
53

Pavel Janík's avatar
Pavel Janík committed
54
  ASCII_KEYSTROKE_EVENT,	/* The ASCII code is in .code, perhaps
Jim Blandy's avatar
Jim Blandy committed
55 56 57
				   with modifiers applied.
				   .modifiers holds the state of the
				   modifier keys.
58 59
				   .frame_or_window is the frame in
				   which the key was typed.
Jim Blandy's avatar
Jim Blandy committed
60 61
				   .timestamp gives a timestamp (in
				   milliseconds) for the keystroke.  */
Pavel Janík's avatar
Pavel Janík committed
62
  MULTIBYTE_CHAR_KEYSTROKE_EVENT,	/* The multibyte char code is in .code,
63 64
				   perhaps with modifiers applied.
				   The others are the same as
Dave Love's avatar
Dave Love committed
65
				   ASCII_KEYSTROKE_EVENT.  */
Pavel Janík's avatar
Pavel Janík committed
66
  NON_ASCII_KEYSTROKE_EVENT,	/* .code is a number identifying the
Jim Blandy's avatar
Jim Blandy committed
67 68 69 70 71 72
				   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
73
				   modifier keys.
74 75
				   .frame_or_window is the frame in
				   which the key was typed.
Jim Blandy's avatar
Jim Blandy committed
76 77
				   .timestamp gives a timestamp (in
				   milliseconds) for the keystroke.  */
Pavel Janík's avatar
Pavel Janík committed
78 79
  TIMER_EVENT,                  /* A timer fired.  */
  MOUSE_CLICK_EVENT,		/* The button number is in .code; it must
80 81
				   be >= 0 and < NUM_MOUSE_BUTTONS, defined
				   below.
Jim Blandy's avatar
Jim Blandy committed
82 83 84
				   .modifiers holds the state of the
				   modifier keys.
				   .x and .y give the mouse position,
Jim Blandy's avatar
Jim Blandy committed
85
				   in characters, within the window.
86 87
				   .frame_or_window gives the frame
				   the mouse click occurred in.
Jim Blandy's avatar
Jim Blandy committed
88 89
				   .timestamp gives a timestamp (in
				   milliseconds) for the click.  */
90 91 92 93 94 95 96 97 98 99 100 101
  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.  */
102 103 104
  HORIZ_WHEEL_EVENT,            /* A wheel event generated by a second
                                   horizontal wheel that is present on some
                                   mice. See WHEEL_EVENT.  */
105
#if defined (WINDOWSNT)
106 107 108 109
  LANGUAGE_CHANGE_EVENT,	/* A LANGUAGE_CHANGE_EVENT is
				   generated on WINDOWSNT or Mac OS
				   when the keyboard layout or input
				   language is changed by the
110
				   user.  */
111
#endif
Pavel Janík's avatar
Pavel Janík committed
112
  SCROLL_BAR_CLICK_EVENT,	/* .code gives the number of the mouse button
113 114 115
				   that was clicked.
				   .modifiers holds the state of the modifier
				   keys.
Jim Blandy's avatar
Jim Blandy committed
116
				   .part is a lisp symbol indicating which
117
				   part of the scroll bar got clicked.
118 119 120
				   .x gives the distance from the start of the
				   scroll bar of the click; .y gives the total
				   length of the scroll bar.
121
				   .frame_or_window gives the window
122
				   whose scroll bar was clicked in.
Jim Blandy's avatar
Jim Blandy committed
123 124
				   .timestamp gives a timestamp (in
				   milliseconds) for the click.  */
Pavel Janík's avatar
Pavel Janík committed
125
  SELECTION_REQUEST_EVENT,	/* Another X client wants a selection from us.
126
				   See `struct selection_input_event'.  */
Pavel Janík's avatar
Pavel Janík committed
127 128 129
  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".  */
130
  MENU_BAR_EVENT,		/* An event generated by the menu bar.
131
				   The frame_or_window field's cdr holds the
132 133
				   Lisp-level event value.
				   (Only the toolkit version uses these.)  */
Pavel Janík's avatar
Pavel Janík committed
134 135 136
  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
137
				   (toolkit version only).  */
Pavel Janík's avatar
Pavel Janík committed
138
  DRAG_N_DROP_EVENT,		/* A drag-n-drop event is generated when
139 140
				   files selected outside of Emacs are dropped
				   onto an Emacs window.
141
				   .modifiers holds the state of the
142 143 144
				   modifier keys.
				   .x and .y give the mouse position,
				   in characters, within the window.
145 146 147 148
				   .frame_or_window is the frame in
				   which the drop was made.
				   .arg is a platform-dependent
				   representation of the dropped items.
149 150
				   .timestamp gives a timestamp (in
				   milliseconds) for the click.  */
151 152
  USER_SIGNAL_EVENT,		/* A user signal.
                                   code is a number identifying it,
Gerd Moellmann's avatar
Gerd Moellmann committed
153 154
                                   index into lispy_user_signals.  */

155 156 157
  /* 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
158 159
  HELP_EVENT,

160 161 162
  /* 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.  */
163 164 165 166
  TOOL_BAR_EVENT,

  /* Queued from XTread_socket on FocusIn events.  Translated into
     `switch-frame' events in kbd_buffer_get_event, if necessary.  */
167 168
  FOCUS_IN_EVENT,

169 170 171
  /* Generated when mouse moves over window not currently selected.  */
  SELECT_WINDOW_EVENT,

172 173
  /* Queued from XTread_socket when session manager sends
     save yourself before shutdown. */
174
  SAVE_SESSION_EVENT
175

176
#ifdef HAVE_GPM
Miles Bader's avatar
Miles Bader committed
177
  , GPM_CLICK_EVENT
178 179
#endif

180 181 182 183
#ifdef HAVE_DBUS
  , DBUS_EVENT
#endif

184 185
  , CONFIG_CHANGED_EVENT

186 187 188 189 190 191 192 193 194 195 196 197 198
#ifdef WINDOWSNT
  /* 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
199
#endif
200 201 202 203 204

#ifdef HAVE_NS
  /* Generated when native multi-keystroke input method is used to modify
     tentative or indicative text display. */
  , NS_TEXT_EVENT
205 206
  /* Non-key system events (e.g. application menu events) */
  , NS_NONKEY_EVENT
207
#endif
Joakim Verona's avatar
Joakim Verona committed
208 209
     /* events generated by xwidgets*/
   , XWIDGET_EVENT
210

211 212
};

Pavel Janík's avatar
Pavel Janík committed
213 214
/* If a struct input_event has a kind which is SELECTION_REQUEST_EVENT
   or SELECTION_CLEAR_EVENT, then its contents are really described
215
   by `struct selection_input_event'; see xterm.h.  */
216 217 218 219 220 221

/* 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.  */

222 223
struct input_event
{
224
  /* What kind of event was this?  */
225
  enum event_kind kind;
226

Pavel Janík's avatar
Pavel Janík committed
227 228 229
  /* 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.
230 231 232
     For a mouse event, this is the button number.
     For a HELP_EVENT, this is the position within the object
      (stored in ARG below) where the help was found.  */
233
  /* In WindowsNT, for a mouse wheel event, this is the delta.  */
234
  EMACS_INT code;
235
  enum scroll_bar_part part;
236

237 238 239
  int modifiers;		/* See enum below for interpretation.  */

  Lisp_Object x, y;
240
  Time timestamp;
241

242
  /* This is padding just to put the frame_or_window field
243
     past the size of struct selection_input_event.  */
244 245
  int *padding[2];

246 247
  /* This field is copied into a vector while the event is in the queue,
     so that garbage collections won't kill it.  */
248 249
  /* In a menu_bar_event, this is a cons cell whose car is the frame
     and whose cdr is the Lisp object that is the event's value.  */
250 251
  /* This field is last so that struct selection_input_event
     does not overlap with it.  */
252
  Lisp_Object frame_or_window;
253 254 255 256

  /* Additional event argument.  This is used for TOOL_BAR_EVENTs and
     HELP_EVENTs and avoids calling Fcons during signal handling.  */
  Lisp_Object arg;
Jim Blandy's avatar
Jim Blandy committed
257
};
Andreas Schwab's avatar
Andreas Schwab committed
258

259
#define EVENT_INIT(event) memset (&(event), 0, sizeof (struct input_event))
Stefan Monnier's avatar
Stefan Monnier committed
260

261 262
/* Bits in the modifiers member of the input_event structure.
   Note that reorder_modifiers assumes that the bits are in canonical
263
   order.
264 265 266

   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
267 268 269 270 271 272
   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
273 274 275 276 277
   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
278
enum {
279 280 281
  up_modifier	=   1,		/* Only used on mouse buttons - always
				   turned into a click or a drag modifier
				   before lisp code sees the event.  */
282 283
  down_modifier =   2,		/* Only used on mouse buttons.  */
  drag_modifier =   4,		/* This is never used in the event
284 285
				   queue; it's only used internally by
				   the window-system-independent code.  */
286
  click_modifier=   8,		/* See drag_modifier.  */
287 288
  double_modifier= 16,          /* See drag_modifier.  */
  triple_modifier= 32,          /* See drag_modifier.  */
289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306

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

     It's probably not the greatest idea to use the 2^23 bit for any
     modifier.  It may or may not be the sign bit, depending on
     VALBITS, so using it to represent a modifier key means that
     characters thus modified have different integer equivalents
     depending on the architecture they're running on.  Oh, and
     applying XINT to a character whose 2^23 bit is set sign-extends
     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,
307
  meta_modifier	=  CHAR_META	/* Under X, the XK_Meta_[LR] keysyms.  */
Jim Blandy's avatar
Jim Blandy committed
308 309
};

310
#ifdef HAVE_GPM
311
#include <gpm.h>
Miles Bader's avatar
Miles Bader committed
312
extern int handle_one_term_event (struct tty_display_info *, Gpm_Event *, struct input_event *);
313
#ifndef HAVE_WINDOW_SYSTEM
314
extern void term_mouse_moveto (int, int);
315
#endif
316

317 318
/* The device for which we have enabled gpm support.  */
extern struct tty_display_info *gpm_tty;
Miles Bader's avatar
Miles Bader committed
319 320
#endif

321

322 323
struct ns_display_info;
struct x_display_info;
324 325
struct w32_display_info;

326 327
/* Terminal-local parameters. */
struct terminal
328
{
329
  /* This is for Lisp; the terminal code does not refer to it.  */
330
  struct vectorlike_header header;
331

332 333 334
  /* Parameter alist of this terminal.  */
  Lisp_Object param_alist;

335 336 337 338 339
  /* 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
340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355
  /* 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;

356 357
  /* All fields before `next_terminal' should be Lisp_Object and are traced
     by the GC.  All fields afterwards are ignored by the GC.  */
358

359 360
  /* Chain of all terminal devices. */
  struct terminal *next_terminal;
361

362
  /* Unique id for this terminal device. */
363 364
  int id;

365
  /* The number of frames that are on this terminal. */
366
  int reference_count;
367

368
  /* The type of the terminal device. */
369 370
  enum output_method type;

371 372 373
  /* The name of the terminal device.  Do not use this to uniquely
     identify a terminal; the same device may be opened multiple
     times. */
374 375
  char *name;

376
  /* The terminal's keyboard object. */
377 378
  struct kboard *kboard;

379 380 381 382 383
#ifdef HAVE_WINDOW_SYSTEM
  /* Cache of images.  */
  struct image_cache *image_cache;
#endif /* HAVE_WINDOW_SYSTEM */

384
  /* Device-type dependent data shared amongst all frames on this terminal. */
385 386 387 388
  union display_info
  {
    struct tty_display_info *tty;     /* termchar.h */
    struct x_display_info *x;         /* xterm.h */
389
    struct w32_display_info *w32;     /* w32term.h */
390
    struct ns_display_info *ns;       /* nsterm.h */
391 392 393
  } display_info;


394 395 396 397 398 399 400 401 402 403 404
  /* 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;

405 406
  /* Terminal characteristics. */
  /* XXX Are these really used on non-termcap displays? */
407

408 409 410 411
  int must_write_spaces;	/* Nonzero means spaces in the text must
				   actually be output; can't just skip over
				   some columns to leave them blank.  */
  int fast_clear_end_of_line;   /* Nonzero means terminal has a `ce' string */
412

413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434
  int line_ins_del_ok;          /* Terminal can insert and delete lines */
  int char_ins_del_ok;          /* Terminal can insert and delete chars */
  int scroll_region_ok;         /* Terminal supports setting the scroll
                                   window */
  int scroll_region_cost;	/* Cost of setting the scroll window,
                                   measured in characters. */
  int memory_below_frame;	/* Terminal remembers lines scrolled
                                   off bottom */

#if 0  /* These are not used anywhere. */
  /* EMACS_INT baud_rate; */	/* Output speed in baud */
  int min_padding_speed;	/* Speed below which no padding necessary. */
  int dont_calculate_costs;     /* Nonzero means don't bother computing
                                   various cost tables; we won't use them. */
#endif

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

  /* Frame-based redisplay interface. */
435

436 437
  /* Text display hooks.  */

Jan D's avatar
Jan D committed
438 439
  void (*cursor_to_hook) (struct frame *f, int vpos, int hpos);
  void (*raw_cursor_to_hook) (struct frame *, int, int);
440

Jan D's avatar
Jan D committed
441 442 443
  void (*clear_to_end_hook) (struct frame *);
  void (*clear_frame_hook) (struct frame *);
  void (*clear_end_of_line_hook) (struct frame *, int);
444

Jan D's avatar
Jan D committed
445
  void (*ins_del_lines_hook) (struct frame *f, int, int);
446

Jan D's avatar
Jan D committed
447 448 449
  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);
450

Jan D's avatar
Jan D committed
451 452
  void (*ring_bell_hook) (struct frame *f);
  void (*toggle_invisible_pointer_hook) (struct frame *f, int invisible);
453

Jan D's avatar
Jan D committed
454 455
  void (*reset_terminal_modes_hook) (struct terminal *);
  void (*set_terminal_modes_hook) (struct terminal *);
Karoly Lorentey's avatar
Karoly Lorentey committed
456

Jan D's avatar
Jan D committed
457 458 459
  void (*update_begin_hook) (struct frame *);
  void (*update_end_hook) (struct frame *);
  void (*set_terminal_window_hook) (struct frame *, int);
460 461 462 463 464 465 466 467

  /* 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.
468

469 470 471 472 473 474 475 476 477
     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.

     Set *time to the time the mouse was at the returned position.
478

479 480
     This should clear mouse_moved until the next motion
     event arrives.  */
Jan D's avatar
Jan D committed
481 482 483 484 485
  void (*mouse_position_hook) (struct frame **f, int,
                               Lisp_Object *bar_window,
                               enum scroll_bar_part *part,
                               Lisp_Object *x,
                               Lisp_Object *y,
486
                               Time *);
487 488 489 490 491 492 493 494 495

  /* The window system handling code should set this if the mouse has
     moved since the last call to the mouse_position_hook.  Calling that
     hook should clear this.  */
  int mouse_moved;

  /* 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
496
  void (*frame_rehighlight_hook) (struct frame *);
497 498 499 500

  /* 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
501
     hook is zero, that means the terminal we're displaying on doesn't
502 503
     support overlapping frames, so there's no need to raise or lower
     anything.
504

505 506
     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
507
     windows.  */
508
  void (*frame_raise_lower_hook) (struct frame *f, int raise_flag);
509

510 511 512
  /* If the value of the frame parameter changed, whis hook is called.
     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
513
  void (*fullscreen_hook) (struct frame *f);
514

515 516 517 518 519 520 521 522
  
  /* 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.
523

524 525 526 527
     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.
528

529 530 531
     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.
532

533 534 535
     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.  */
536 537


538 539 540 541 542
  /* 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
543 544 545
  void (*set_vertical_scroll_bar_hook) (struct window *window,
                                        int portion, int whole,
                                        int position);
546 547 548 549 550 551 552 553 554


  /* 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.  */
555

556 557 558
  /* 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
     `*redeem_scroll_bar_hook' is applied to its window before the judgement.
559

560 561 562 563
     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.
564

565 566 567
     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
568
  void (*condemn_scroll_bars_hook) (struct frame *frame);
569 570 571

  /* Unmark WINDOW's scroll bar for deletion in this judgement cycle.
     Note that it's okay to redeem a scroll bar that is not condemned.  */
Jan D's avatar
Jan D committed
572
  void (*redeem_scroll_bar_hook) (struct window *window);
573 574 575 576 577 578 579 580

  /* 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.
581

582 583 584
     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
585
  void (*judge_scroll_bars_hook) (struct frame *FRAME);
586 587


588 589
  /* Called to read input events.

590 591 592 593
     TERMINAL indicates which terminal device to read from.  Input
     events should be read into BUF, the size of which is given in
     SIZE.  EXPECTED is non-zero if the caller suspects that new input
     is available.
594 595 596 597 598

     A positive return value indicates that that many input events
     where read into BUF.
     Zero means no events were immediately available.
     A value of -1 means a transient read error, while -2 indicates
599
     that the device was closed (hangup), and it should be deleted.
600 601 602

     XXX Please note that a non-zero value of EXPECTED only means that
     there is available input on at least one of the currently opened
603
     terminal devices -- but not necessarily on this device.
604
     Therefore, in most cases EXPECTED should be simply ignored.
605 606

     XXX This documentation needs to be updated.  */
Jan D's avatar
Jan D committed
607 608 609
  int (*read_socket_hook) (struct terminal *terminal,
                           int expected,
                           struct input_event *hold_quit);
610 611

  /* Called when a frame's display becomes entirely up to date.  */
Jan D's avatar
Jan D committed
612
  void (*frame_up_to_date_hook) (struct frame *);
613 614 615


  /* Called to delete the device-specific portions of a frame that is
616
     on this terminal device. */
Jan D's avatar
Jan D committed
617
  void (*delete_frame_hook) (struct frame *);
618

619
  /* Called after the last frame on this terminal is deleted, or when
620
     the display device was closed (hangup).
621

622 623
     If this is NULL, then the generic delete_terminal is called
     instead.  Otherwise the hook must call delete_terminal itself.
624

625
     The hook must check for and close any live frames that are still
626
     on the terminal.  delete_frame ensures that there are no live
627
     frames on the terminal when it calls this hook, so infinite
628
     recursion is prevented.  */
Jan D's avatar
Jan D committed
629
  void (*delete_terminal_hook) (struct terminal *);
630 631 632
};


633 634
/* Chain of all terminal devices currently in use. */
extern struct terminal *terminal_list;
635

636 637 638 639 640 641 642
#define FRAME_MUST_WRITE_SPACES(f) ((f)->terminal->must_write_spaces)
#define FRAME_FAST_CLEAR_END_OF_LINE(f) ((f)->terminal->fast_clear_end_of_line)
#define FRAME_LINE_INS_DEL_OK(f) ((f)->terminal->line_ins_del_ok)
#define FRAME_CHAR_INS_DEL_OK(f) ((f)->terminal->char_ins_del_ok)
#define FRAME_SCROLL_REGION_OK(f) ((f)->terminal->scroll_region_ok)
#define FRAME_SCROLL_REGION_COST(f) ((f)->terminal->scroll_region_cost)
#define FRAME_MEMORY_BELOW_FRAME(f) ((f)->terminal->memory_below_frame)
643

644 645
#define FRAME_TERMINAL_CODING(f) ((f)->terminal->terminal_coding)
#define FRAME_KEYBOARD_CODING(f) ((f)->terminal->keyboard_coding)
646

647 648
#define TERMINAL_TERMINAL_CODING(d) ((d)->terminal_coding)
#define TERMINAL_KEYBOARD_CODING(d) ((d)->keyboard_coding)
649

650
#define FRAME_RIF(f) ((f)->terminal->rif)
651

652
#define FRAME_TERMINAL(f) ((f)->terminal)
653

654
/* Return true if the terminal device is not suspended. */
655
#define TERMINAL_ACTIVE_P(d) (((d)->type != output_termcap && (d)->type !=output_msdos_raw) || (d)->display_info.tty->input)
656

Jan D's avatar
Jan D committed
657 658 659
extern struct terminal *get_terminal (Lisp_Object terminal, int);
extern struct terminal *create_terminal (void);
extern void delete_terminal (struct terminal *);
660

661 662
/* The initial terminal device, created by initial_term_init. */
extern struct terminal *initial_terminal;
663

664 665 666
extern unsigned char *encode_terminal_code (struct glyph *, int,
					    struct coding_system *);

667
#ifdef HAVE_GPM
668
extern void close_gpm (int gpm_fd);
669
#endif