window.c 172 KB
Newer Older
Jim Blandy's avatar
Jim Blandy committed
1 2
/* Window creation, deletion and examination for GNU Emacs.
   Does not include redisplay.
3 4
   Copyright (C) 1985,86,87,93,94,95,96,97,1998,2000
   Free Software Foundation, Inc.
Jim Blandy's avatar
Jim Blandy committed
5 6 7 8 9

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
Jim Blandy's avatar
Jim Blandy committed
10
the Free Software Foundation; either version 2, or (at your option)
Jim Blandy's avatar
Jim Blandy committed
11 12 13 14 15 16 17 18 19
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
20 21
the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.  */
Jim Blandy's avatar
Jim Blandy committed
22

23
#include <config.h>
Jim Blandy's avatar
Jim Blandy committed
24 25
#include "lisp.h"
#include "buffer.h"
26
#include "keyboard.h"
Jim Blandy's avatar
Jim Blandy committed
27
#include "frame.h"
Jim Blandy's avatar
Jim Blandy committed
28 29 30 31 32
#include "window.h"
#include "commands.h"
#include "indent.h"
#include "termchar.h"
#include "disptab.h"
Andreas Schwab's avatar
Andreas Schwab committed
33
#include "dispextern.h"
34 35 36
#include "blockinput.h"
#include "intervals.h"

37
#ifdef HAVE_X_WINDOWS
Andreas Schwab's avatar
Andreas Schwab committed
38
#include "xterm.h"
39
#endif	/* HAVE_X_WINDOWS */
Andrew Innes's avatar
Andrew Innes committed
40 41 42
#ifdef WINDOWSNT
#include "w32term.h"
#endif
43 44 45
#ifdef MSDOS
#include "msdos.h"
#endif
46 47 48
#ifdef macintosh
#include "macterm.h"
#endif
49 50 51

#ifndef max
#define max(a, b) ((a) < (b) ? (b) : (a))
Andreas Schwab's avatar
Andreas Schwab committed
52
#endif
Jim Blandy's avatar
Jim Blandy committed
53

54

55
Lisp_Object Qwindowp, Qwindow_live_p, Qwindow_configuration_p;
56
Lisp_Object Qwindow_size_fixed, Qleft_bitmap_area, Qright_bitmap_area;
Gerd Moellmann's avatar
Gerd Moellmann committed
57
extern Lisp_Object Qheight, Qwidth;
Jim Blandy's avatar
Jim Blandy committed
58

Andreas Schwab's avatar
Andreas Schwab committed
59
static struct window *decode_window P_ ((Lisp_Object));
60
static Lisp_Object select_window_1 P_ ((Lisp_Object, int));
61 62 63 64 65
static int count_windows P_ ((struct window *));
static int get_leaf_windows P_ ((struct window *, struct window **, int));
static void window_scroll P_ ((Lisp_Object, int, int, int));
static void window_scroll_pixel_based P_ ((Lisp_Object, int, int, int));
static void window_scroll_line_based P_ ((Lisp_Object, int, int, int));
Gerd Moellmann's avatar
Gerd Moellmann committed
66
static int window_min_size_1 P_ ((struct window *, int));
67
static int window_min_size P_ ((struct window *, int, int, int *));
Gerd Moellmann's avatar
Gerd Moellmann committed
68
static void size_window P_ ((Lisp_Object, int, int, int));
69
static int freeze_window_start P_ ((struct window *, void *));
70
static int window_fixed_size_p P_ ((struct window *, int, int));
71
static void enlarge_window P_ ((Lisp_Object, int, int));
Gerd Moellmann's avatar
Gerd Moellmann committed
72
static Lisp_Object window_list P_ ((void));
73
static int add_window_to_list P_ ((struct window *, void *));
74 75
static int candidate_window_p P_ ((Lisp_Object, Lisp_Object, Lisp_Object,
				   Lisp_Object));
Gerd Moellmann's avatar
Gerd Moellmann committed
76 77 78 79
static Lisp_Object next_window P_ ((Lisp_Object, Lisp_Object,
				    Lisp_Object, int));
static void decode_next_window_args P_ ((Lisp_Object *, Lisp_Object *,
					 Lisp_Object *));
80 81 82
static int foreach_window_1 P_ ((struct window *,
				 int (* fn) (struct window *, void *),
				 void *));
83
static Lisp_Object window_list_1 P_ ((Lisp_Object, Lisp_Object, Lisp_Object));
84

Jim Blandy's avatar
Jim Blandy committed
85 86 87 88 89 90
/* This is the window in which the terminal's cursor should
   be left when nothing is being done with it.  This must
   always be a leaf window, and its buffer is selected by
   the top level editing loop at the end of each command.

   This value is always the same as
Jim Blandy's avatar
Jim Blandy committed
91
   FRAME_SELECTED_WINDOW (selected_frame).  */
Jim Blandy's avatar
Jim Blandy committed
92 93 94

Lisp_Object selected_window;

Gerd Moellmann's avatar
Gerd Moellmann committed
95 96 97 98 99 100
/* A list of all windows for use by next_window and Fwindow_list.
   Functions creating or deleting windows should invalidate this cache
   by setting it to nil.  */

Lisp_Object Vwindow_list;

101 102 103
/* The mini-buffer window of the selected frame.
   Note that you cannot test for mini-bufferness of an arbitrary window
   by comparing against this; but you can test for mini-bufferness of
Jim Blandy's avatar
Jim Blandy committed
104
   the selected window.  */
105

Jim Blandy's avatar
Jim Blandy committed
106 107 108
Lisp_Object minibuf_window;

/* Non-nil means it is the window for C-M-v to scroll
109 110
   when the mini-buffer is selected.  */

Jim Blandy's avatar
Jim Blandy committed
111 112 113
Lisp_Object Vminibuf_scroll_window;

/* Non-nil means this is the buffer whose window C-M-v should scroll.  */
114

Jim Blandy's avatar
Jim Blandy committed
115 116 117
Lisp_Object Vother_window_scroll_buffer;

/* Non-nil means it's function to call to display temp buffers.  */
118

Jim Blandy's avatar
Jim Blandy committed
119 120 121
Lisp_Object Vtemp_buffer_show_function;

/* If a window gets smaller than either of these, it is removed. */
122

Jim Blandy's avatar
Jim Blandy committed
123 124 125 126
int window_min_height;
int window_min_width;

/* Nonzero implies Fdisplay_buffer should create windows. */
127

Jim Blandy's avatar
Jim Blandy committed
128 129
int pop_up_windows;

Jim Blandy's avatar
Jim Blandy committed
130
/* Nonzero implies make new frames for Fdisplay_buffer.  */
131

Jim Blandy's avatar
Jim Blandy committed
132
int pop_up_frames;
Jim Blandy's avatar
Jim Blandy committed
133

134 135 136 137
/* Nonzero means reuse existing frames for displaying buffers.  */

int display_buffer_reuse_frames;

Jim Blandy's avatar
Jim Blandy committed
138
/* Non-nil means use this function instead of default */
139

Jim Blandy's avatar
Jim Blandy committed
140
Lisp_Object Vpop_up_frame_function;
Jim Blandy's avatar
Jim Blandy committed
141 142

/* Function to call to handle Fdisplay_buffer.  */
143

Jim Blandy's avatar
Jim Blandy committed
144 145
Lisp_Object Vdisplay_buffer_function;

146 147 148 149
/* Non-nil means that Fdisplay_buffer should even the heights of windows.  */

Lisp_Object Veven_window_heights;

150
/* List of buffer *names* for buffers that should have their own frames.  */
151

152 153 154
Lisp_Object Vspecial_display_buffer_names;

/* List of regexps for buffer names that should have their own frames.  */
155

156 157 158
Lisp_Object Vspecial_display_regexps;

/* Function to pop up a special frame.  */
159

160 161
Lisp_Object Vspecial_display_function;

162
/* List of buffer *names* for buffers to appear in selected window.  */
163

164 165 166
Lisp_Object Vsame_window_buffer_names;

/* List of regexps for buffer names to appear in selected window.  */
167

168 169
Lisp_Object Vsame_window_regexps;

170
/* Hook run at end of temp_output_buffer_show.  */
171

172 173
Lisp_Object Qtemp_buffer_show_hook;

174
/* Fdisplay_buffer always splits the largest window
Jim Blandy's avatar
Jim Blandy committed
175
   if that window is more than this high.  */
176

Jim Blandy's avatar
Jim Blandy committed
177 178 179
int split_height_threshold;

/* Number of lines of continuity in scrolling by screenfuls.  */
180

Jim Blandy's avatar
Jim Blandy committed
181 182 183
int next_screen_context_lines;

/* Incremented for each window created.  */
184

Jim Blandy's avatar
Jim Blandy committed
185 186
static int sequence_number;

187
/* Nonzero after init_window_once has finished.  */
188

189 190
static int window_initialized;

191
/* Hook to run when window config changes.  */
192

193 194 195
Lisp_Object Qwindow_configuration_change_hook;
Lisp_Object Vwindow_configuration_change_hook;

196 197 198
/* Nonzero means scroll commands try to put point
   at the same screen height as previously.  */

199 200 201
Lisp_Object Vscroll_preserve_screen_position;

#if 0 /* This isn't used anywhere.  */
202
/* Nonzero means we can split a frame even if it is "unsplittable".  */
203
static int inhibit_frame_unsplittable;
204
#endif /* 0 */
205

Jim Blandy's avatar
Jim Blandy committed
206
#define min(a, b) ((a) < (b) ? (a) : (b))
207

208 209
extern int scroll_margin;

210
extern Lisp_Object Qwindow_scroll_functions, Vwindow_scroll_functions;
Jim Blandy's avatar
Jim Blandy committed
211 212

DEFUN ("windowp", Fwindowp, Swindowp, 1, 1, 0,
213 214 215
  "Returns t if OBJECT is a window.")
  (object)
     Lisp_Object object;
Jim Blandy's avatar
Jim Blandy committed
216
{
217
  return WINDOWP (object) ? Qt : Qnil;
Jim Blandy's avatar
Jim Blandy committed
218 219
}

220
DEFUN ("window-live-p", Fwindow_live_p, Swindow_live_p, 1, 1, 0,
221 222 223
  "Returns t if OBJECT is a window which is currently visible.")
     (object)
     Lisp_Object object;
224
{
225
  return (WINDOWP (object) && ! NILP (XWINDOW (object)->buffer) ? Qt : Qnil);
226 227
}

Jim Blandy's avatar
Jim Blandy committed
228 229 230
Lisp_Object
make_window ()
{
231
  Lisp_Object val;
Jim Blandy's avatar
Jim Blandy committed
232
  register struct window *p;
233 234 235 236 237 238 239
  register struct Lisp_Vector *vec;
  int i;

  vec = allocate_vectorlike ((EMACS_INT) VECSIZE (struct window));
  for (i = 0; i < VECSIZE (struct window); i++)
    vec->contents[i] = Qnil;
  vec->size = VECSIZE (struct window);
240
  p = (struct window *) vec;
241 242 243 244 245 246
  XSETFASTINT (p->sequence_number, ++sequence_number);
  XSETFASTINT (p->left, 0);
  XSETFASTINT (p->top, 0);
  XSETFASTINT (p->height, 0);
  XSETFASTINT (p->width, 0);
  XSETFASTINT (p->hscroll, 0);
247
  p->orig_top = p->orig_height = Qnil;
Jim Blandy's avatar
Jim Blandy committed
248 249
  p->start = Fmake_marker ();
  p->pointm = Fmake_marker ();
250
  XSETFASTINT (p->use_time, 0);
Jim Blandy's avatar
Jim Blandy committed
251
  p->frame = Qnil;
Jim Blandy's avatar
Jim Blandy committed
252 253
  p->display_table = Qnil;
  p->dedicated = Qnil;
254 255 256 257 258 259 260 261 262 263 264
  p->pseudo_window_p = 0;
  bzero (&p->cursor, sizeof (p->cursor));
  bzero (&p->last_cursor, sizeof (p->last_cursor));
  bzero (&p->phys_cursor, sizeof (p->phys_cursor));
  p->desired_matrix = p->current_matrix = 0;
  p->phys_cursor_type = -1;
  p->must_be_updated_p = 0;
  XSETFASTINT (p->window_end_vpos, 0);
  XSETFASTINT (p->window_end_pos, 0);
  p->window_end_valid = Qnil;
  p->vscroll = 0;
265
  XSETWINDOW (val, p);
266
  XSETFASTINT (p->last_point, 0);
267
  p->frozen_window_start_p = 0;
Gerd Moellmann's avatar
Gerd Moellmann committed
268 269

  Vwindow_list = Qnil;
Jim Blandy's avatar
Jim Blandy committed
270 271 272 273 274 275 276 277 278 279
  return val;
}

DEFUN ("selected-window", Fselected_window, Sselected_window, 0, 0, 0,
  "Return the window that the cursor now appears in and commands apply to.")
  ()
{
  return selected_window;
}

280 281 282 283 284 285
DEFUN ("minibuffer-window", Fminibuffer_window, Sminibuffer_window, 0, 1, 0,
  "Return the window used now for minibuffers.\n\
If the optional argument FRAME is specified, return the minibuffer window\n\
used by that frame.")
  (frame)
    Lisp_Object frame;
Jim Blandy's avatar
Jim Blandy committed
286
{
287
  if (NILP (frame))
288 289
    frame = selected_frame;
  CHECK_LIVE_FRAME (frame, 0);
290
  return FRAME_MINIBUF_WINDOW (XFRAME (frame));
Jim Blandy's avatar
Jim Blandy committed
291 292
}

293
DEFUN ("window-minibuffer-p", Fwindow_minibuffer_p, Swindow_minibuffer_p, 0, 1, 0,
Jim Blandy's avatar
Jim Blandy committed
294 295 296 297 298
  "Returns non-nil if WINDOW is a minibuffer window.")
  (window)
     Lisp_Object window;
{
  struct window *w = decode_window (window);
299
  return MINI_WINDOW_P (w) ? Qt : Qnil;
Miles Bader's avatar
Miles Bader committed
300 301 302
}


Jim Blandy's avatar
Jim Blandy committed
303
DEFUN ("pos-visible-in-window-p", Fpos_visible_in_window_p,
Miles Bader's avatar
Miles Bader committed
304
  Spos_visible_in_window_p, 0, 3, 0,
Jim Blandy's avatar
Jim Blandy committed
305
  "Return t if position POS is currently on the frame in WINDOW.\n\
306
Return nil if that position is scrolled vertically out of view.\n\
307 308
If a character is only partially visible, nil is returned, unless the\n\
optional argument PARTIALLY is non-nil.\n\
Miles Bader's avatar
Miles Bader committed
309
POS defaults to point in WINDOW; WINDOW defaults to the selected window.")
310 311
  (pos, window, partially)
     Lisp_Object pos, window, partially;
Jim Blandy's avatar
Jim Blandy committed
312 313 314 315
{
  register struct window *w;
  register int posint;
  register struct buffer *buf;
316 317
  struct text_pos top;
  Lisp_Object in_window;
318
  int fully_p;
Jim Blandy's avatar
Jim Blandy committed
319

Miles Bader's avatar
Miles Bader committed
320 321 322 323 324
  w = decode_window (window);
  buf = XBUFFER (w->buffer);
  SET_TEXT_POS_FROM_MARKER (top, w->start);

  if (!NILP (pos))
Jim Blandy's avatar
Jim Blandy committed
325 326 327 328
    {
      CHECK_NUMBER_COERCE_MARKER (pos, 0);
      posint = XINT (pos);
    }
Miles Bader's avatar
Miles Bader committed
329 330 331 332
  else if (w == XWINDOW (selected_window))
    posint = PT;
  else
    posint = XMARKER (w->pointm)->charpos;
Jim Blandy's avatar
Jim Blandy committed
333

334
  /* If position is above window start, it's not visible.  */
335
  if (posint < CHARPOS (top))
336 337
    in_window = Qnil;
  else if (XFASTINT (w->last_modified) >= BUF_MODIFF (buf)
Miles Bader's avatar
Miles Bader committed
338 339 340
	   && XFASTINT (w->last_overlay_modified) >= BUF_OVERLAY_MODIFF (buf)
	   && posint < BUF_Z (buf) - XFASTINT (w->window_end_pos))
    {
341 342 343 344
      /* If frame is up-to-date, and POSINT is < window end pos, use
	 that info.  This doesn't work for POSINT == end pos, because
	 the window end pos is actually the position _after_ the last
	 char in the window.  */
345
      if (NILP (partially))
346
	{
347
	  pos_visible_p (w, posint, &fully_p, NILP (partially));
348 349
	  in_window = fully_p ? Qt : Qnil;
	}
Miles Bader's avatar
Miles Bader committed
350
      else
351
	in_window = Qt;
Miles Bader's avatar
Miles Bader committed
352
    }
353 354 355 356 357
  else if (posint > BUF_ZV (buf))
    in_window = Qnil;
  else if (CHARPOS (top) < BUF_BEGV (buf) || CHARPOS (top) > BUF_ZV (buf))
    /* If window start is out of range, do something reasonable.  */
    in_window = Qnil;
Jim Blandy's avatar
Jim Blandy committed
358 359
  else
    {
360 361
      if (pos_visible_p (w, posint, &fully_p, NILP (partially)))
	in_window = !NILP (partially) || fully_p ? Qt : Qnil;
Miles Bader's avatar
Miles Bader committed
362 363
      else
	in_window = Qnil;
Jim Blandy's avatar
Jim Blandy committed
364
    }
365 366

  return in_window;
Jim Blandy's avatar
Jim Blandy committed
367
}
368

Jim Blandy's avatar
Jim Blandy committed
369 370 371 372 373

static struct window *
decode_window (window)
     register Lisp_Object window;
{
Jim Blandy's avatar
Jim Blandy committed
374
  if (NILP (window))
Jim Blandy's avatar
Jim Blandy committed
375 376
    return XWINDOW (selected_window);

377
  CHECK_LIVE_WINDOW (window, 0);
Jim Blandy's avatar
Jim Blandy committed
378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397
  return XWINDOW (window);
}

DEFUN ("window-buffer", Fwindow_buffer, Swindow_buffer, 0, 1, 0,
  "Return the buffer that WINDOW is displaying.")
  (window)
     Lisp_Object window;
{
  return decode_window (window)->buffer;
}

DEFUN ("window-height", Fwindow_height, Swindow_height, 0, 1, 0,
  "Return the number of lines in WINDOW (including its mode line).")
  (window)
     Lisp_Object window;
{
  return decode_window (window)->height;
}

DEFUN ("window-width", Fwindow_width, Swindow_width, 0, 1, 0,
398 399 400 401
  "Return the number of display columns in WINDOW.\n\
This is the width that is usable columns available for text in WINDOW.\n\
If you want to find out how many columns WINDOW takes up,\n\
use  (let ((edges (window-edges))) (- (nth 2 edges) (nth 0 edges))).")
Jim Blandy's avatar
Jim Blandy committed
402 403 404
  (window)
     Lisp_Object window;
{
405
  return make_number (window_internal_width (decode_window (window)));
Jim Blandy's avatar
Jim Blandy committed
406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424
}

DEFUN ("window-hscroll", Fwindow_hscroll, Swindow_hscroll, 0, 1, 0,
  "Return the number of columns by which WINDOW is scrolled from left margin.")
  (window)
     Lisp_Object window;
{
  return decode_window (window)->hscroll;
}

DEFUN ("set-window-hscroll", Fset_window_hscroll, Sset_window_hscroll, 2, 2, 0,
  "Set number of columns WINDOW is scrolled from left margin to NCOL.\n\
NCOL should be zero or positive.")
  (window, ncol)
     register Lisp_Object window, ncol;
{
  register struct window *w;

  CHECK_NUMBER (ncol, 1);
425
  if (XINT (ncol) < 0) XSETFASTINT (ncol, 0);
Jim Blandy's avatar
Jim Blandy committed
426
  w = decode_window (window);
427
  if (XINT (w->hscroll) != XINT (ncol))
Gerd Moellmann's avatar
Gerd Moellmann committed
428 429
    /* Prevent redisplay shortcuts */
    XBUFFER (w->buffer)->prevent_redisplay_optimizations_p = 1;
Jim Blandy's avatar
Jim Blandy committed
430 431 432 433
  w->hscroll = ncol;
  return ncol;
}

434 435 436 437 438 439 440 441 442 443 444 445 446 447
DEFUN ("window-redisplay-end-trigger", Fwindow_redisplay_end_trigger,
       Swindow_redisplay_end_trigger, 0, 1, 0,
  "Return WINDOW's redisplay end trigger value.\n\
See `set-window-redisplay-end-trigger' for more information.")
  (window)
     Lisp_Object window;
{
  return decode_window (window)->redisplay_end_trigger;
}

DEFUN ("set-window-redisplay-end-trigger", Fset_window_redisplay_end_trigger,
       Sset_window_redisplay_end_trigger, 2, 2, 0,
  "Set WINDOW's redisplay end trigger value to VALUE.\n\
VALUE should be a buffer position (typically a marker) or nil.\n\
448 449 450 451
If it is a buffer position, then if redisplay in WINDOW reaches a position\n\
beyond VALUE, the functions in `redisplay-end-trigger-functions' are called\n\
with two arguments: WINDOW, and the end trigger value.\n\
Afterwards the end-trigger value is reset to nil.")
452 453 454 455 456 457 458 459 460 461
  (window, value)
     register Lisp_Object window, value;
{
  register struct window *w;

  w = decode_window (window);
  w->redisplay_end_trigger = value;
  return value;
}

Jim Blandy's avatar
Jim Blandy committed
462 463
DEFUN ("window-edges", Fwindow_edges, Swindow_edges, 0, 1, 0,
  "Return a list of the edge coordinates of WINDOW.\n\
Jim Blandy's avatar
Jim Blandy committed
464
\(LEFT TOP RIGHT BOTTOM), all relative to 0, 0 at top left corner of frame.\n\
Jim Blandy's avatar
Jim Blandy committed
465 466 467 468 469 470 471 472 473
RIGHT is one more than the rightmost column used by WINDOW,\n\
and BOTTOM is one more than the bottommost row used by WINDOW\n\
 and its mode-line.")
  (window)
     Lisp_Object window;
{
  register struct window *w = decode_window (window);

  return Fcons (w->left, Fcons (w->top,
474
           Fcons (make_number (WINDOW_RIGHT_EDGE (w)),
Jim Blandy's avatar
Jim Blandy committed
475 476 477 478 479
		  Fcons (make_number (XFASTINT (w->top)
				      + XFASTINT (w->height)),
			 Qnil))));
}

480
/* Test if the character at column *X, row *Y is within window W.
Jim Blandy's avatar
Jim Blandy committed
481 482 483 484 485 486 487
   If it is not, return 0;
   if it is in the window's text area,
      set *x and *y to its location relative to the upper left corner
         of the window, and
      return 1;
   if it is on the window's modeline, return 2;
   if it is on the border between the window and its right sibling,
488 489
      return 3.
   if it is on the window's top line, return 4;
490 491
   if it is in the bitmap area to the left/right of the window,
   return 5 or 6, and convert *X and *Y to window-relative corrdinates.
492 493 494

   X and Y are frame relative pixel coordinates.  */

Jim Blandy's avatar
Jim Blandy committed
495 496 497 498 499
static int
coordinates_in_window (w, x, y)
     register struct window *w;
     register int *x, *y;
{
500 501
  struct frame *f = XFRAME (WINDOW_FRAME (w));
  int left_x, right_x, top_y, bottom_y;
Gerd Moellmann's avatar
Gerd Moellmann committed
502
  int flags_area_width = FRAME_LEFT_FLAGS_AREA_WIDTH (f);
Jim Blandy's avatar
Jim Blandy committed
503

504 505 506 507 508
  /* Let's make this a global enum later, instead of using numbers
     everywhere.  */
  enum {ON_NOTHING, ON_TEXT, ON_MODE_LINE, ON_VERTICAL_BORDER,
	ON_HEADER_LINE, ON_LEFT_FRINGE, ON_RIGHT_FRINGE};

509 510
  /* In what's below, we subtract 1 when computing right_x because we
     want the rightmost pixel, which is given by left_pixel+width-1.  */
511 512 513
  if (w->pseudo_window_p)
    {
      left_x = 0;
514
      right_x = XFASTINT (w->width) * CANON_Y_UNIT (f) - 1;
515 516 517 518 519
      top_y = WINDOW_DISPLAY_TOP_EDGE_PIXEL_Y (w);
      bottom_y = WINDOW_DISPLAY_BOTTOM_EDGE_PIXEL_Y (w);
    }
  else
    {
520
      left_x = (WINDOW_DISPLAY_LEFT_EDGE_PIXEL_X (w)
Gerd Moellmann's avatar
Gerd Moellmann committed
521
		- FRAME_INTERNAL_BORDER_WIDTH_SAFE (f));
522
      right_x = WINDOW_DISPLAY_RIGHT_EDGE_PIXEL_X (w) - 1;
523
      top_y = (WINDOW_DISPLAY_TOP_EDGE_PIXEL_Y (w)
Gerd Moellmann's avatar
Gerd Moellmann committed
524
	       - FRAME_INTERNAL_BORDER_WIDTH_SAFE (f));
525 526
      bottom_y = WINDOW_DISPLAY_BOTTOM_EDGE_PIXEL_Y (w);
    }
527

528 529 530 531 532 533 534
  /* On the mode line or header line?  If it's near the start of
     the mode or header line of window that's has a horizontal
     sibling, say it's on the vertical line.  That's to be able
     to resize windows horizontally in case we're using toolkit
     scroll bars.  */
  
  if (WINDOW_WANTS_MODELINE_P (w)
535
      && *y < bottom_y
536 537
      && *y >= bottom_y - CURRENT_MODE_LINE_HEIGHT (w))
    {
538 539 540
      if (!WINDOW_RIGHTMOST_P (w)
	  && (abs (*x - ((XFASTINT (w->left) + XFASTINT (w->width))
			 * CANON_X_UNIT (f)))
541 542 543 544 545 546
	      < CANON_X_UNIT (f) / 2))
	return ON_VERTICAL_BORDER;
      return ON_MODE_LINE;
    }
  
  if (WINDOW_WANTS_HEADER_LINE_P (w)
547
      && *y >= top_y
548 549
      && *y < top_y + CURRENT_HEADER_LINE_HEIGHT (w))
    {
550 551 552
      if (!WINDOW_RIGHTMOST_P (w)
	  && (abs (*x - ((XFASTINT (w->left) + XFASTINT (w->width))
			 * CANON_X_UNIT (f)))
553 554 555 556
	      < CANON_X_UNIT (f) / 2))
	return ON_VERTICAL_BORDER;
      return ON_HEADER_LINE;
    }
557

558 559 560 561 562 563 564 565 566 567
  /* Completely outside anything interesting?  */
  if (*y < top_y
      || *y >= bottom_y
      || *x < (left_x
	       - flags_area_width
	       - (FRAME_LEFT_SCROLL_BAR_WIDTH (f)
		  * CANON_X_UNIT (f)))
      || *x > right_x + flags_area_width)
    return ON_NOTHING;
  
568
  if (FRAME_WINDOW_P (f))
569
    {
570 571 572 573 574 575 576 577 578 579
      if (!w->pseudo_window_p
	  && !FRAME_HAS_VERTICAL_SCROLL_BARS (f)
	  && !WINDOW_RIGHTMOST_P (w)
	  && (abs (*x - right_x - flags_area_width) < CANON_X_UNIT (f) / 2))
	return ON_VERTICAL_BORDER;

      if (*x < left_x || *x > right_x)
	{
	  /* Other lines than the mode line don't include flags areas and
	     scroll bars on the left.  */
580
      
581 582 583 584 585
	  /* Convert X and Y to window-relative pixel coordinates.  */
	  *x -= left_x;
	  *y -= top_y;
	  return *x < left_x ? ON_LEFT_FRINGE : ON_RIGHT_FRINGE;
	}
586
    }
587 588 589 590 591 592 593 594 595 596 597 598 599 600
  else
    {
      /* Need to say "*x > right_x" rather than >=, since on character
	 terminals, the vertical line's x coordinate is right_x.  */
      if (*x < left_x || *x > right_x)
	{
	  /* Other lines than the mode line don't include flags areas and
	     scroll bars on the left.  */
      
	  /* Convert X and Y to window-relative pixel coordinates.  */
	  *x -= left_x;
	  *y -= top_y;
	  return *x < left_x ? ON_LEFT_FRINGE : ON_RIGHT_FRINGE;
	}
601
  
602 603 604 605 606 607 608 609
      /* Here, too, "*x > right_x" is because of character terminals.  */
      if (!w->pseudo_window_p
	  && !WINDOW_RIGHTMOST_P (w)
	  && *x > right_x - CANON_X_UNIT (f))
	/* On the border on the right side of the window?  Assume that
	   this area begins at RIGHT_X minus a canonical char width.  */
	return ON_VERTICAL_BORDER;
    }
610 611 612 613 614
  
  /* Convert X and Y to window-relative pixel coordinates.  */
  *x -= left_x;
  *y -= top_y;
  return ON_TEXT;
Jim Blandy's avatar
Jim Blandy committed
615 616 617 618 619
}

DEFUN ("coordinates-in-window-p", Fcoordinates_in_window_p,
  Scoordinates_in_window_p, 2, 2, 0,
  "Return non-nil if COORDINATES are in WINDOW.\n\
Jim Blandy's avatar
Jim Blandy committed
620
COORDINATES is a cons of the form (X . Y), X and Y being distances\n\
Jim Blandy's avatar
Jim Blandy committed
621
measured in characters from the upper-left corner of the frame.\n\
Jim Blandy's avatar
Jim Blandy committed
622
(0 .  0) denotes the character in the upper left corner of the\n\
Jim Blandy's avatar
Jim Blandy committed
623
frame.\n\
Jim Blandy's avatar
Jim Blandy committed
624 625
If COORDINATES are in the text portion of WINDOW,\n\
   the coordinates relative to the window are returned.\n\
Jim Blandy's avatar
Jim Blandy committed
626
If they are in the mode line of WINDOW, `mode-line' is returned.\n\
Gerd Moellmann's avatar
Change  
Gerd Moellmann committed
627
If they are in the top mode line of WINDOW, `header-line' is returned.\n\
628 629 630
If they are in the bitmap-area to the left of the window,\n\
   `left-bitmap-area' is returned, if they are in the area on the right of\n\
   the window, `right-bitmap-area' is returned.\n\
Jim Blandy's avatar
Jim Blandy committed
631
If they are on the border between WINDOW and its right sibling,\n\
Jim Blandy's avatar
Jim Blandy committed
632
   `vertical-line' is returned.")
Jim Blandy's avatar
Jim Blandy committed
633 634 635
  (coordinates, window)
     register Lisp_Object coordinates, window;
{
636 637
  struct window *w;
  struct frame *f;
Jim Blandy's avatar
Jim Blandy committed
638
  int x, y;
639
  Lisp_Object lx, ly;
Jim Blandy's avatar
Jim Blandy committed
640

641
  CHECK_LIVE_WINDOW (window, 0);
642 643
  w = XWINDOW (window);
  f = XFRAME (w->frame);
Jim Blandy's avatar
Jim Blandy committed
644
  CHECK_CONS (coordinates, 1);
645 646 647 648 649 650 651 652
  lx = Fcar (coordinates);
  ly = Fcdr (coordinates);
  CHECK_NUMBER_OR_FLOAT (lx, 1);
  CHECK_NUMBER_OR_FLOAT (ly, 1);
  x = PIXEL_X_FROM_CANON_X (f, lx);
  y = PIXEL_Y_FROM_CANON_Y (f, ly);

  switch (coordinates_in_window (w, &x, &y))
Jim Blandy's avatar
Jim Blandy committed
653 654 655 656 657
    {
    case 0:			/* NOT in window at all. */
      return Qnil;

    case 1:			/* In text part of window. */
658 659 660 661 662
      /* X and Y are now window relative pixel coordinates.
	 Convert them to canonical char units before returning
	 them.  */
      return Fcons (CANON_X_FROM_PIXEL_X (f, x), 
		    CANON_Y_FROM_PIXEL_Y (f, y));
Jim Blandy's avatar
Jim Blandy committed
663 664 665

    case 2:			/* In mode line of window. */
      return Qmode_line;
666

Jim Blandy's avatar
Jim Blandy committed
667
    case 3:			/* On right border of window.  */
Jim Blandy's avatar
Jim Blandy committed
668
      return Qvertical_line;
Jim Blandy's avatar
Jim Blandy committed
669

670
    case 4:
Gerd Moellmann's avatar
Change  
Gerd Moellmann committed
671
      return Qheader_line;
672

673 674 675 676 677 678
    case 5:
      return Qleft_bitmap_area;
      
    case 6:
      return Qright_bitmap_area;

Jim Blandy's avatar
Jim Blandy committed
679 680 681 682 683
    default:
      abort ();
    }
}

Gerd Moellmann's avatar
Gerd Moellmann committed
684 685

/* Callback for foreach_window, used in window_from_coordinates.
686 687 688 689 690
   Check if window W contains coordinates specified by USER_DATA which
   is actually a pointer to a struct check_window_data CW.

   Check if window W contains coordinates *CW->x and *CW->y.  If it
   does, return W in *CW->window, as Lisp_Object, and return in
Dave Love's avatar
Dave Love committed
691
   *CW->part the part of the window under coordinates *X,*Y.  Return
692 693 694 695 696 697 698
   zero from this function to stop iterating over windows.  */

struct check_window_data
{
  Lisp_Object *window;
  int *x, *y, *part;
};
Gerd Moellmann's avatar
Gerd Moellmann committed
699 700

static int
701
check_window_containing (w, user_data)
Gerd Moellmann's avatar
Gerd Moellmann committed
702
     struct window *w;
703
     void *user_data;
Gerd Moellmann's avatar
Gerd Moellmann committed
704
{
705
  struct check_window_data *cw = (struct check_window_data *) user_data;
Gerd Moellmann's avatar
Gerd Moellmann committed
706 707
  int found;

708
  found = coordinates_in_window (w, cw->x, cw->y);
Gerd Moellmann's avatar
Gerd Moellmann committed
709 710
  if (found)
    {
711 712
      *cw->part = found - 1;
      XSETWINDOW (*cw->window, w);
Gerd Moellmann's avatar
Gerd Moellmann committed
713 714 715 716 717 718
    }
  
  return !found;
}


719 720 721 722 723
/* Find the window containing frame-relative pixel position X/Y and
   return it as a Lisp_Object.  If X, Y is on the window's modeline,
   set *PART to 1; if it is on the separating line between the window
   and its right sibling, set it to 2; otherwise set it to 0.  If
   there is no window under X, Y return nil and leave *PART
Gerd Moellmann's avatar
Gerd Moellmann committed
724 725 726 727 728 729 730 731 732 733
   unmodified.  TOOL_BAR_P non-zero means detect tool-bar windows.

   This function was previously implemented with a loop cycling over
   windows with Fnext_window, and starting with the frame's selected
   window.  It turned out that this doesn't work with an
   implementation of next_window using Vwindow_list, because
   FRAME_SELECTED_WINDOW (F) is not always contained in the window
   tree of F when this function is called asynchronously from
   note_mouse_highlight.  The original loop didn't terminate in this
   case.  */
734

Jim Blandy's avatar
Jim Blandy committed
735
Lisp_Object
Gerd Moellmann's avatar
Gerd Moellmann committed
736 737
window_from_coordinates (f, x, y, part, tool_bar_p)
     struct frame *f;
Jim Blandy's avatar
Jim Blandy committed
738
     int x, y;
Jim Blandy's avatar
Jim Blandy committed
739
     int *part;
740
     int tool_bar_p;
Jim Blandy's avatar
Jim Blandy committed
741
{
Gerd Moellmann's avatar
Gerd Moellmann committed
742
  Lisp_Object window;
743
  struct check_window_data cw;
744

Gerd Moellmann's avatar
Gerd Moellmann committed
745
  window = Qnil;
746 747
  cw.window = &window, cw.x = &x, cw.y = &y; cw.part = part;
  foreach_window (f, check_window_containing, &cw);
Gerd Moellmann's avatar
Gerd Moellmann committed
748 749 750 751 752 753 754 755
  
  /* If not found above, see if it's in the tool bar window, if a tool
     bar exists.  */
  if (NILP (window)
      && tool_bar_p
      && WINDOWP (f->tool_bar_window)
      && XINT (XWINDOW (f->tool_bar_window)->height) > 0
      && coordinates_in_window (XWINDOW (f->tool_bar_window), &x, &y))
756 757
    {
      *part = 0;
Gerd Moellmann's avatar
Gerd Moellmann committed
758
      window = f->tool_bar_window;
759
    }
760

Gerd Moellmann's avatar
Gerd Moellmann committed
761
  return window;
Jim Blandy's avatar
Jim Blandy committed
762 763
}

764
DEFUN ("window-at", Fwindow_at, Swindow_at, 2, 3, 0,
Richard M. Stallman's avatar
Richard M. Stallman committed
765
  "Return window containing coordinates X and Y on FRAME.\n\
Jim Blandy's avatar
Jim Blandy committed
766 767
If omitted, FRAME defaults to the currently selected frame.\n\
The top left corner of the frame is considered to be row 0,\n\
Jim Blandy's avatar
Jim Blandy committed
768
column 0.")
Richard M. Stallman's avatar
Richard M. Stallman committed
769 770
  (x, y, frame)
      Lisp_Object x, y, frame;
Jim Blandy's avatar
Jim Blandy committed
771 772
{
  int part;
773
  struct frame *f;
Jim Blandy's avatar
Jim Blandy committed
774

Jim Blandy's avatar
Jim Blandy committed
775
  if (NILP (frame))
776 777
    frame = selected_frame;
  CHECK_LIVE_FRAME (frame, 2);
778
  f = XFRAME (frame);
Jim Blandy's avatar
Jim Blandy committed
779

780 781 782 783 784 785 786 787
  /* Check that arguments are integers or floats.  */
  CHECK_NUMBER_OR_FLOAT (x, 0);
  CHECK_NUMBER_OR_FLOAT (y, 1);

  return window_from_coordinates (f, 
				  PIXEL_X_FROM_CANON_X (f, x),
				  PIXEL_Y_FROM_CANON_Y (f, y),
				  &part, 0);
Jim Blandy's avatar
Jim Blandy committed
788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811
}

DEFUN ("window-point", Fwindow_point, Swindow_point, 0, 1, 0,
  "Return current value of point in WINDOW.\n\
For a nonselected window, this is the value point would have\n\
if that window were selected.\n\
\n\
Note that, when WINDOW is the selected window and its buffer\n\
is also currently selected, the value returned is the same as (point).\n\
It would be more strictly correct to return the `top-level' value\n\
of point, outside of any save-excursion forms.\n\
But that is hard to define.")
  (window)
     Lisp_Object window;
{
  register struct window *w = decode_window (window);

  if (w == XWINDOW (selected_window)
      && current_buffer == XBUFFER (w->buffer))
    return Fpoint ();
  return Fmarker_position (w->pointm);
}

DEFUN ("window-start", Fwindow_start, Swindow_start, 0, 1, 0,
812 813
  "Return position at which display currently starts in WINDOW.\n\
This is updated by redisplay or by calling `set-window-start'.")
Jim Blandy's avatar
Jim Blandy committed
814 815 816 817 818 819
  (window)
     Lisp_Object window;
{
  return Fmarker_position (decode_window (window)->start);
}

820 821
/* This is text temporarily removed from the doc string below.

822 823 824 825 826 827 828
This function returns nil if the position is not currently known.\n\
That happens when redisplay is preempted and doesn't finish.\n\
If in that case you want to compute where the end of the window would\n\
have been if redisplay had finished, do this:\n\
    (save-excursion\n\
      (goto-char (window-start window))\n\
      (vertical-motion (1- (window-height window)) window)\n\
829 830
      (point))")  */

831
DEFUN ("window-end", Fwindow_end, Swindow_end, 0, 2, 0,
832 833 834
  "Return position at which display currently ends in WINDOW.\n\
This is updated by redisplay, when it runs to completion.\n\
Simply changing the buffer text or setting `window-start'\n\
835 836 837 838 839
does not update this value.\n\
If UP-TO-DATE is non-nil, compute the up-to-date position\n\
if it isn't already recorded.")
  (window, update)
     Lisp_Object window, update;
Jim Blandy's avatar
Jim Blandy committed
840 841 842
{
  Lisp_Object value;
  struct window *w = decode_window (window);
843 844 845 846 847
  Lisp_Object buf;

  buf = w->buffer;
  CHECK_BUFFER (buf, 0);

848
#if 0 /* This change broke some things.  We should make it later.  */
849 850 851 852 853 854
  /* If we don't know the end position, return nil.
     The user can compute it with vertical-motion if he wants to.
     It would be nicer to do it automatically,
     but that's so slow that it would probably bother people.  */
  if (NILP (w->window_end_valid))
    return Qnil;
855
#endif
856

857 858 859 860
  if (! NILP (update)
      && ! (! NILP (w->window_end_valid)
	    && XFASTINT (w->last_modified) >= MODIFF))
    {
861 862
      struct text_pos startp;
      struct it it;
863 864 865 866 867

      /* In case W->start is out of the range, use something
         reasonable.  This situation occured when loading a file with
         `-l' containing a call to `rmail' with subsequent other
         commands.  At the end, W->start happened to be BEG, while
868
         rmail had already narrowed the buffer.  */
869
      if (XMARKER (w->start)->charpos < BEGV)
870
	SET_TEXT_POS (startp, BEGV, BEGV_BYTE);
871
      else if (XMARKER (w->start)->charpos > ZV)
872
	SET_TEXT_POS (startp, ZV, ZV_BYTE);
873
      else
874 875 876 877 878 879 880
	SET_TEXT_POS_FROM_MARKER (startp, w->start);

      /* Cannot use Fvertical_motion because that function doesn't
	 cope with variable-height lines.  */
      start_display (&it, w, startp);
      move_it_vertically (&it, window_box_height (w));
      value = make_number (IT_CHARPOS (it));
881 882
    }
  else
883
    XSETINT (value, BUF_Z (XBUFFER (buf)) - XFASTINT (w->window_end_pos));
Jim Blandy's avatar
Jim Blandy committed
884 885 886 887 888 889 890 891 892 893 894 895

  return value;
}

DEFUN ("set-window-point", Fset_window_point, Sset_window_point, 2, 2, 0,
  "Make point value in WINDOW be at position POS in WINDOW's buffer.")
  (window, pos)
     Lisp_Object window, pos;
{
  register struct window *w = decode_window (window);

  CHECK_NUMBER_COERCE_MARKER (pos, 1);
896 897
  if (w == XWINDOW (selected_window)
      && XBUFFER (w->buffer) == current_buffer)
Jim Blandy's avatar
Jim Blandy committed
898 899 900
    Fgoto_char (pos);
  else
    set_marker_restricted (w->pointm, pos, w->buffer);
901
  
Jim Blandy's avatar
Jim Blandy committed
902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917
  return pos;
}

DEFUN ("set-window-start", Fset_window_start, Sset_window_start, 2, 3, 0,
  "Make display in WINDOW start at position POS in WINDOW's buffer.\n\
Optional third arg NOFORCE non-nil inhibits next redisplay\n\
from overriding motion of point in order to display at this exact start.")
  (window, pos, noforce)
     Lisp_Object window, pos, noforce;
{
  register struct window *w = decode_window (window);

  CHECK_NUMBER_COERCE_MARKER (pos, 1);
  set_marker_restricted (w->start, pos, w->buffer);
  /* this is not right, but much easier than doing what is right. */
  w->start_at_line_beg = Qnil;
Jim Blandy's avatar
Jim Blandy committed
918
  if (NILP (noforce))
Jim Blandy's avatar
Jim Blandy committed
919 920
    w->force_start = Qt;
  w->update_mode_line = Qt;
921
  XSETFASTINT (w->last_modified, 0);
922
  XSETFASTINT (w->last_overlay_modified, 0);
Jim Blandy's avatar
Jim Blandy committed
923 924
  if (!EQ (window, selected_window))
    windows_or_buffers_changed++;
925

Jim Blandy's avatar
Jim Blandy committed
926 927 928 929 930 931
  return pos;
}

DEFUN ("window-dedicated-p", Fwindow_dedicated_p, Swindow_dedicated_p,
       1, 1, 0,
  "Return WINDOW's dedicated object, usually t or nil.\n\
932
See also `set-window-dedicated-p'.")
Jim Blandy's avatar
Jim Blandy committed
933 934 935 936 937 938
  (window)
     Lisp_Object window;
{
  return decode_window (window)->dedicated;
}

939 940 941 942 943 944 945
DEFUN ("set-window-dedicated-p", Fset_window_dedicated_p,
       Sset_window_dedicated_p, 2, 2, 0,
  "Control whether WINDOW is dedicated to the buffer it displays.\n\
If it is dedicated, Emacs will not automatically change\n\
which buffer appears in it.\n\
The second argument is the new value for the dedication flag;\n\
non-nil means yes.")
Jim Blandy's avatar
Jim Blandy committed
946 947 948 949 950
  (window, arg)
       Lisp_Object window, arg;
{
  register struct window *w = decode_window (window);

Jim Blandy's avatar
Jim Blandy committed
951
  if (NILP (arg))
Jim Blandy's avatar
Jim Blandy committed
952 953
    w->dedicated = Qnil;
  else
954
    w->dedicated = Qt;
Jim Blandy's avatar
Jim Blandy committed
955 956 957 958 959 960 961 962 963 964 965 966 967

  return w->dedicated;
}

DEFUN ("window-display-table", Fwindow_display_table, Swindow_display_table,
       0, 1, 0,
  "Return the display-table that WINDOW is using.")
  (window)
     Lisp_Object window;
{
  return decode_window (window)->display_table;
}

968 969 970 971
/* Get the display table for use on window W.  This is either W's
   display table or W's buffer's display table.  Ignore the specified
   tables if they are not valid; if no valid table is specified,
   return 0.  */
Jim Blandy's avatar
Jim Blandy committed
972

973
struct Lisp_Char_Table *
Jim Blandy's avatar
Jim Blandy committed
974 975 976
window_display_table (w)
     struct window *w;
{
977 978 979 980 981 982 983 984 985 986 987 988 989
  struct Lisp_Char_Table *dp = NULL;

  if (DISP_TABLE_P (w->display_table))
    dp = XCHAR_TABLE (w->display_table);
  else if (BUFFERP (w->buffer))
    {
      struct buffer *b = XBUFFER (w->buffer);
      
      if (DISP_TABLE_P (b->display_table))
	dp = XCHAR_TABLE (b->display_table);
      else if (DISP_TABLE_P (Vstandard_display_table))
	dp = XCHAR_TABLE (Vstandard_display_table);
    }
990

991
  return dp;
Jim Blandy's avatar
Jim Blandy committed
992 993
}

Jim Blandy's avatar
Jim Blandy committed
994
DEFUN ("set-window-display-table", Fset_window_display_table, Sset_window_display_table, 2, 2, 0,
Jim Blandy's avatar
Jim Blandy committed
995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007
  "Set WINDOW's display-table to TABLE.")
  (window, table)
     register Lisp_Object window, table;
{
  register struct window *w;

  w = decode_window (window);
  w->display_table = table;
  return table;
}

/* Record info on buffer window w is displaying
   when it is about to cease to display that buffer.  */
Andreas Schwab's avatar
Andreas Schwab committed
1008
static void
Jim Blandy's avatar
Jim Blandy committed
1009 1010 1011
unshow_buffer (w)
     register struct window *w;
{
1012
  Lisp_Object buf;
1013
  struct buffer *b;
Jim Blandy's avatar
Jim Blandy committed
1014

1015
  buf = w->buffer;
1016 1017
  b = XBUFFER (buf);
  if (b != XMARKER (w->pointm)->buffer)
Jim Blandy's avatar
Jim Blandy committed
1018 1019
    abort ();

1020
#if 0
Jim Blandy's avatar
Jim Blandy committed
1021 1022 1023 1024
  if (w == XWINDOW (selected_window)
      || ! EQ (buf, XWINDOW (selected_window)->buffer))
    /* Do this except when the selected window's buffer
       is being removed from some other window.  */
1025 1026 1027 1028 1029 1030 1031 1032
#endif
    /* last_window_start records the start position that this buffer
       had in the last window to be disconnected from it.
       Now that this statement is unconditional,
       it is possible for the buffer to be displayed in the
       selected window, while last_window_start reflects another
       window which was recently showing the same buffer.
       Some people might say that might be a good thing.  Let's see.  */
1033
    b->last_window_start = marker_position (w->start);
Jim Blandy's avatar
Jim Blandy committed
1034 1035 1036 1037

  /* Point in the selected window's buffer
     is actually stored in that buffer, and the window's pointm isn't used.
     So don't clobber point in that buffer.  */
1038 1039
  if (! EQ (buf, XWINDOW (selected_window)->buffer)
      /* This line helps to fix Horsley's testbug.el bug.  */
1040 1041
      && !(WINDOWP (b->last_selected_window)
	   && w != XWINDOW (b->last_selected_window)
1042
	   && EQ (buf, XWINDOW (b->last_selected_window)->buffer)))
1043 1044 1045 1046 1047 1048 1049
    temp_set_point_both (b,
			 clip_to_bounds (BUF_BEGV (b),
					 XMARKER (w->pointm)->charpos,
					 BUF_ZV (b)),
			 clip_to_bounds (BUF_BEGV_BYTE (b),
					 marker_byte_position (w->pointm),
					 BUF_ZV_BYTE (b)));
1050
  
1051 1052
  if (WINDOWP (b->last_selected_window)
      && w == XWINDOW (b->last_selected_window))
1053
    b->last_selected_window = Qnil;
Jim Blandy's avatar
Jim Blandy committed
1054 1055 1056
}

/* Put replacement into the window structure in place of old. */
Andreas Schwab's avatar
Andreas Schwab committed
1057
static void
Jim Blandy's avatar
Jim Blandy committed
1058 1059 1060 1061 1062 1063
replace_window (old, replacement)
     Lisp_Object old, replacement;
{
  register Lisp_Object tem;
  register struct window *o = XWINDOW (old), *p = XWINDOW (replacement);

Jim Blandy's avatar
Jim Blandy committed
1064 1065
  /* If OLD is its frame's root_window, then replacement is the new
     root_window for that frame.  */
Jim Blandy's avatar
Jim Blandy committed
1066

1067
  if (EQ (old, FRAME_ROOT_WINDOW (XFRAME (o->frame))))
Jim Blandy's avatar
Jim Blandy committed
1068
    FRAME_ROOT_WINDOW (XFRAME (o->frame)) = replacement;
Jim Blandy's avatar
Jim Blandy committed
1069 1070 1071 1072 1073

  p->left = o->left;
  p->top = o->top;
  p->width = o->width;
  p->height = o->height;
1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084
  p->desired_matrix = p->current_matrix = 0;
  p->vscroll = 0;
  bzero (&p->cursor, sizeof (p->cursor));
  bzero (&p->last_cursor, sizeof (p->last_cursor));
  bzero (&p->phys_cursor, sizeof (p->phys_cursor));
  p->phys_cursor_type = -1;
  p->must_be_updated_p = 0;
  p->pseudo_window_p = 0;
  XSETFASTINT (p->window_end_vpos, 0);
  XSETFASTINT (p->window_end_pos, 0);
  p->window_end_valid = Qnil;
1085
  p->frozen_window_start_p = 0;
1086
  p->orig_top = p->orig_height = Qnil;
Jim Blandy's avatar
Jim Blandy committed
1087 1088

  p->next = tem = o->next;
Jim Blandy's avatar
Jim Blandy committed
1089
  if (!NILP (tem))
Jim Blandy's avatar
Jim Blandy committed
1090 1091 1092
    XWINDOW (tem)->prev = replacement;

  p->prev = tem = o->prev;
Jim Blandy's avatar
Jim Blandy committed
1093
  if (!NILP (tem))
Jim Blandy's avatar
Jim Blandy committed
1094 1095 1096
    XWINDOW (tem)->next = replacement;

  p->parent = tem = o->parent;
Jim Blandy's avatar
Jim Blandy committed
1097
  if (!NILP (tem))
Jim Blandy's avatar
Jim Blandy committed
1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113
    {
      if (EQ (XWINDOW (tem)->vchild, old))
	XWINDOW (tem)->vchild = replacement;
      if (EQ (XWINDOW (tem)->hchild, old))
	XWINDOW (tem)->hchild = replacement;
    }

/*** Here, if replacement is a vertical combination
and so is its new parent, we should make replacement's
children be children of that parent instead.  ***/
}

DEFUN ("delete-window", Fdelete_window, Sdelete_window, 0, 1, "",
  "Remove WINDOW from the display.  Default is selected window.")
  (window)
     register Lisp_Object window;
1114 1115 1116 1117 1118 1119 1120 1121 1122 1123
{
  delete_window (window);

  if (! NILP (Vwindow_configuration_change_hook)
      && ! NILP (Vrun_hooks))
    call1 (Vrun_hooks, Qwindow_configuration_change_hook);

  return Qnil;
}

Andreas Schwab's avatar
Andreas Schwab committed
1124
void
1125 1126
delete_window (window)
     register Lisp_Object window;
Jim Blandy's avatar
Jim Blandy committed
1127 1128 1129 1130
{
  register Lisp_Object tem, parent, sib;
  register struct window *p;
  register struct window *par;
1131
  FRAME_PTR frame;
Jim Blandy's avatar
Jim Blandy committed
1132

1133 1134 1135
  /* Because this function is called by other C code on non-leaf
     windows, the CHECK_LIVE_WINDOW macro would choke inappropriately,
     so we can't decode_window here.  */
Jim Blandy's avatar
Jim Blandy committed
1136
  if (NILP (window))
Jim Blandy's avatar
Jim Blandy committed
1137 1138 1139 1140
    window = selected_window;
  else
    CHECK_WINDOW (window, 0);
  p = XWINDOW (window);
1141 1142 1143 1144 1145

  /* It's okay to delete an already-deleted window.  */
  if (NILP (p->buffer)
      && NILP (p->hchild)
      && NILP (p->vchild))
1146
    return;
1147

Jim Blandy's avatar
Jim Blandy committed
1148
  parent = p->parent;
Jim Blandy's avatar
Jim Blandy committed
1149
  if (NILP (parent))
Jim Blandy's avatar
Jim Blandy committed
1150 1151 1152 1153
    error ("Attempt to delete minibuffer or sole ordinary window");
  par = XWINDOW (parent);

  windows_or_buffers_changed++;
Gerd Moellmann's avatar
Gerd Moellmann committed
1154
  Vwindow_list = Qnil;
1155 1156
  frame = XFRAME (WINDOW_FRAME (p));
  FRAME_WINDOW_SIZES_CHANGED (frame) = 1;
Jim Blandy's avatar
Jim Blandy committed
1157

1158 1159
  /* Are we trying to delete any frame's selected window?  */
  {