window.c 223 KB
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/* Window creation, deletion and examination for GNU Emacs.
   Does not include redisplay.
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   Copyright (C) 1985-1987, 1993-1998, 2000-2011
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                 Free Software Foundation, Inc.
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This file is part of GNU Emacs.

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GNU Emacs is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
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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
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along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
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#include <config.h>
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#include <stdio.h>
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#include <setjmp.h>
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#include "lisp.h"
#include "buffer.h"
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#include "keyboard.h"
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#include "keymap.h"
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#include "frame.h"
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#include "window.h"
#include "commands.h"
#include "indent.h"
#include "termchar.h"
#include "disptab.h"
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#include "dispextern.h"
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#include "blockinput.h"
#include "intervals.h"
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#include "termhooks.h"		/* For FRAME_TERMINAL.  */
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#ifdef HAVE_X_WINDOWS
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#include "xterm.h"
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#endif	/* HAVE_X_WINDOWS */
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#ifdef WINDOWSNT
#include "w32term.h"
#endif
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#ifdef MSDOS
#include "msdos.h"
#endif
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#ifdef HAVE_NS
#include "nsterm.h"
#endif
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Lisp_Object Qwindowp, Qwindow_live_p, Qwindow_configuration_p;
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Lisp_Object Qdisplay_buffer;
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Lisp_Object Qscroll_up, Qscroll_down, Qscroll_command;
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Lisp_Object Qwindow_size_fixed;
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static int displayed_window_lines (struct window *);
static struct window *decode_window (Lisp_Object);
static int count_windows (struct window *);
static int get_leaf_windows (struct window *, struct window **, int);
static void window_scroll (Lisp_Object, int, int, int);
static void window_scroll_pixel_based (Lisp_Object, int, int, int);
static void window_scroll_line_based (Lisp_Object, int, int, int);
static int window_min_size_1 (struct window *, int, int);
static int window_min_size_2 (struct window *, int, int);
static int window_min_size (struct window *, int, int, int, int *);
static void size_window (Lisp_Object, int, int, int, int, int);
static int freeze_window_start (struct window *, void *);
static int window_fixed_size_p (struct window *, int, int);
static void enlarge_window (Lisp_Object, int, int);
static Lisp_Object window_list (void);
static int add_window_to_list (struct window *, void *);
static int candidate_window_p (Lisp_Object, Lisp_Object, Lisp_Object,
                               Lisp_Object);
static Lisp_Object next_window (Lisp_Object, Lisp_Object,
                                Lisp_Object, int);
static void decode_next_window_args (Lisp_Object *, Lisp_Object *,
                                     Lisp_Object *);
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static void foreach_window (struct frame *,
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				 int (* fn) (struct window *, void *),
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                            void *);
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static int foreach_window_1 (struct window *,
                             int (* fn) (struct window *, void *),
                             void *);
static Lisp_Object window_list_1 (Lisp_Object, Lisp_Object, Lisp_Object);
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static Lisp_Object select_window (Lisp_Object, Lisp_Object, int);
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/* 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
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   FRAME_SELECTED_WINDOW (selected_frame).  */
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Lisp_Object selected_window;

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/* 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;

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/* 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
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   the selected window.  */
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Lisp_Object minibuf_window;

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/* Non-nil means it is the window whose mode line should be
   shown as the selected window when the minibuffer is selected.  */

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Lisp_Object minibuf_selected_window;
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/* Hook run at end of temp_output_buffer_show.  */
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Lisp_Object Qtemp_buffer_show_hook;

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/* Incremented for each window created.  */
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static int sequence_number;

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/* Nonzero after init_window_once has finished.  */
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static int window_initialized;

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/* Hook to run when window config changes.  */
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static Lisp_Object Qwindow_configuration_change_hook;
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/* Incremented by 1 whenever a window is deleted.  */

int window_deletion_count;

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/* Used by the function window_scroll_pixel_based */

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static int window_scroll_pixel_based_preserve_x;
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static int window_scroll_pixel_based_preserve_y;
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/* Same for window_scroll_line_based.  */

static int window_scroll_preserve_hpos;
static int window_scroll_preserve_vpos;

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#if 0 /* This isn't used anywhere.  */
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/* Nonzero means we can split a frame even if it is "unsplittable".  */
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static int inhibit_frame_unsplittable;
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#endif
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DEFUN ("windowp", Fwindowp, Swindowp, 1, 1, 0,
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       doc: /* Return t if OBJECT is a window.  */)
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  (Lisp_Object object)
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{
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  return WINDOWP (object) ? Qt : Qnil;
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}

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DEFUN ("window-live-p", Fwindow_live_p, Swindow_live_p, 1, 1, 0,
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       doc: /* Return t if OBJECT is a window which is currently visible.  */)
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  (Lisp_Object object)
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{
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  return WINDOW_LIVE_P (object) ? Qt : Qnil;
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}

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Lisp_Object
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make_window (void)
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{
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  Lisp_Object val;
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  register struct window *p;
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  p = allocate_window ();
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  ++sequence_number;
  XSETFASTINT (p->sequence_number, sequence_number);
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  XSETFASTINT (p->left_col, 0);
  XSETFASTINT (p->top_line, 0);
  XSETFASTINT (p->total_lines, 0);
  XSETFASTINT (p->total_cols, 0);
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  XSETFASTINT (p->hscroll, 0);
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  XSETFASTINT (p->min_hscroll, 0);
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  p->orig_top_line = p->orig_total_lines = Qnil;
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  p->start = Fmake_marker ();
  p->pointm = Fmake_marker ();
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  XSETFASTINT (p->use_time, 0);
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  p->frame = Qnil;
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  p->display_table = Qnil;
  p->dedicated = Qnil;
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  p->window_parameters = Qnil;
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  p->pseudo_window_p = 0;
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  memset (&p->cursor, 0, sizeof (p->cursor));
  memset (&p->last_cursor, 0, sizeof (p->last_cursor));
  memset (&p->phys_cursor, 0, sizeof (p->phys_cursor));
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  p->desired_matrix = p->current_matrix = 0;
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  p->nrows_scale_factor = p->ncols_scale_factor = 1;
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  p->phys_cursor_type = -1;
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  p->phys_cursor_width = -1;
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  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;
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  XSETWINDOW (val, p);
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  XSETFASTINT (p->last_point, 0);
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  p->frozen_window_start_p = 0;
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  p->last_cursor_off_p = p->cursor_off_p = 0;
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  p->left_margin_cols = Qnil;
  p->right_margin_cols = Qnil;
  p->left_fringe_width = Qnil;
  p->right_fringe_width = Qnil;
  p->fringes_outside_margins = Qnil;
  p->scroll_bar_width = Qnil;
  p->vertical_scroll_bar_type = Qt;
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  p->resize_proportionally = Qnil;
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  Vwindow_list = Qnil;
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  return val;
}

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

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DEFUN ("minibuffer-window", Fminibuffer_window, Sminibuffer_window, 0, 1, 0,
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       doc: /* Return the window used now for minibuffers.
If the optional argument FRAME is specified, return the minibuffer window
used by that frame.  */)
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  (Lisp_Object frame)
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{
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  if (NILP (frame))
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    frame = selected_frame;
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  CHECK_LIVE_FRAME (frame);
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  return FRAME_MINIBUF_WINDOW (XFRAME (frame));
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}

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DEFUN ("window-minibuffer-p", Fwindow_minibuffer_p, Swindow_minibuffer_p, 0, 1, 0,
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       doc: /* Return non-nil if WINDOW is a minibuffer window.
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WINDOW defaults to the selected window.  */)
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  (Lisp_Object window)
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{
  struct window *w = decode_window (window);
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  return MINI_WINDOW_P (w) ? Qt : Qnil;
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}


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DEFUN ("pos-visible-in-window-p", Fpos_visible_in_window_p,
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       Spos_visible_in_window_p, 0, 3, 0,
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       doc: /* Return non-nil if position POS is currently on the frame in WINDOW.
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Return nil if that position is scrolled vertically out of view.
If a character is only partially visible, nil is returned, unless the
optional argument PARTIALLY is non-nil.
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If POS is only out of view because of horizontal scrolling, return non-nil.
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If POS is t, it specifies the position of the last visible glyph in WINDOW.
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POS defaults to point in WINDOW; WINDOW defaults to the selected window.

If POS is visible, return t if PARTIALLY is nil; if PARTIALLY is non-nil,
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return value is a list of 2 or 6 elements (X Y [RTOP RBOT ROWH VPOS]),
where X and Y are the pixel coordinates relative to the top left corner
of the window.  The remaining elements are omitted if the character after
POS is fully visible; otherwise, RTOP and RBOT are the number of pixels
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off-window at the top and bottom of the row, ROWH is the height of the
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display row, and VPOS is the row number (0-based) containing POS.  */)
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  (Lisp_Object pos, Lisp_Object window, Lisp_Object partially)
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{
  register struct window *w;
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  register EMACS_INT posint;
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  register struct buffer *buf;
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  struct text_pos top;
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  Lisp_Object in_window = Qnil;
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  int rtop, rbot, rowh, vpos, fully_p = 1;
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  int x, y;
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  w = decode_window (window);
  buf = XBUFFER (w->buffer);
  SET_TEXT_POS_FROM_MARKER (top, w->start);

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  if (EQ (pos, Qt))
    posint = -1;
  else if (!NILP (pos))
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    {
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      CHECK_NUMBER_COERCE_MARKER (pos);
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      posint = XINT (pos);
    }
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  else if (w == XWINDOW (selected_window))
    posint = PT;
  else
    posint = XMARKER (w->pointm)->charpos;
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  /* If position is above window start or outside buffer boundaries,
     or if window start is out of range, position is not visible.  */
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  if ((EQ (pos, Qt)
       || (posint >= CHARPOS (top) && posint <= BUF_ZV (buf)))
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      && CHARPOS (top) >= BUF_BEGV (buf)
      && CHARPOS (top) <= BUF_ZV (buf)
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      && pos_visible_p (w, posint, &x, &y, &rtop, &rbot, &rowh, &vpos)
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      && (fully_p = !rtop && !rbot, (!NILP (partially) || fully_p)))
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    in_window = Qt;

  if (!NILP (in_window) && !NILP (partially))
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    {
      Lisp_Object part = Qnil;
      if (!fully_p)
	part = list4 (make_number (rtop), make_number (rbot),
			make_number (rowh), make_number (vpos));
      in_window = Fcons (make_number (x),
			 Fcons (make_number (y), part));
    }

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  return in_window;
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}
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DEFUN ("window-line-height", Fwindow_line_height,
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       Swindow_line_height, 0, 2, 0,
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       doc: /* Return height in pixels of text line LINE in window WINDOW.
If WINDOW is nil or omitted, use selected window.

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Return height of current line if LINE is omitted or nil.  Return height of
header or mode line if LINE is `header-line' and `mode-line'.
Otherwise, LINE is a text line number starting from 0.  A negative number
counts from the end of the window.
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Value is a list (HEIGHT VPOS YPOS OFFBOT), where HEIGHT is the height
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in pixels of the visible part of the line, VPOS and YPOS are the
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vertical position in lines and pixels of the line, relative to the top
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of the first text line, and OFFBOT is the number of off-window pixels at
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the bottom of the text line.  If there are off-window pixels at the top
of the (first) text line, YPOS is negative.
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Return nil if window display is not up-to-date.  In that case, use
`pos-visible-in-window-p' to obtain the information.  */)
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  (Lisp_Object line, Lisp_Object window)
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{
  register struct window *w;
  register struct buffer *b;
  struct glyph_row *row, *end_row;
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  int max_y, crop, i, n;
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  w = decode_window (window);

  if (noninteractive
      || w->pseudo_window_p)
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    return Qnil;
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  CHECK_BUFFER (w->buffer);
  b = XBUFFER (w->buffer);

  /* Fail if current matrix is not up-to-date.  */
  if (NILP (w->window_end_valid)
      || current_buffer->clip_changed
      || current_buffer->prevent_redisplay_optimizations_p
      || XFASTINT (w->last_modified) < BUF_MODIFF (b)
      || XFASTINT (w->last_overlay_modified) < BUF_OVERLAY_MODIFF (b))
    return Qnil;

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  if (NILP (line))
    {
      i = w->cursor.vpos;
      if (i < 0 || i >= w->current_matrix->nrows
	  || (row = MATRIX_ROW (w->current_matrix, i), !row->enabled_p))
	return Qnil;
      max_y = window_text_bottom_y (w);
      goto found_row;
    }

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  if (EQ (line, Qheader_line))
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    {
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      if (!WINDOW_WANTS_HEADER_LINE_P (w))
	return Qnil;
      row = MATRIX_HEADER_LINE_ROW (w->current_matrix);
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      if (!row->enabled_p)
	return Qnil;
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      return list4 (make_number (row->height),
		    make_number (0), make_number (0),
		    make_number (0));
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    }
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  if (EQ (line, Qmode_line))
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    {
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      row = MATRIX_MODE_LINE_ROW (w->current_matrix);
      if (!row->enabled_p)
	return Qnil;
      return list4 (make_number (row->height),
		    make_number (0), /* not accurate */
		    make_number (WINDOW_HEADER_LINE_HEIGHT (w)
				 + window_text_bottom_y (w)),
		    make_number (0));
    }
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  CHECK_NUMBER (line);
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  n = XINT (line);
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  row = MATRIX_FIRST_TEXT_ROW (w->current_matrix);
  end_row = MATRIX_BOTTOM_TEXT_ROW (w->current_matrix, w);
  max_y = window_text_bottom_y (w);
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  i = 0;
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  while ((n < 0 || i < n)
	 && row <= end_row && row->enabled_p
	 && row->y + row->height < max_y)
    row++, i++;
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  if (row > end_row || !row->enabled_p)
    return Qnil;

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  if (++n < 0)
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    {
      if (-n > i)
	return Qnil;
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      row += n;
      i += n;
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    }

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 found_row:
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  crop = max (0, (row->y + row->height) - max_y);
  return list4 (make_number (row->height + min (0, row->y) - crop),
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		make_number (i),
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		make_number (row->y),
		make_number (crop));
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}

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static struct window *
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decode_window (register Lisp_Object window)
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{
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  if (NILP (window))
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    return XWINDOW (selected_window);

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  CHECK_LIVE_WINDOW (window);
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  return XWINDOW (window);
}

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static struct window *
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decode_any_window (register Lisp_Object window)
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{
  if (NILP (window))
    return XWINDOW (selected_window);

  CHECK_WINDOW (window);
  return XWINDOW (window);
}

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DEFUN ("window-buffer", Fwindow_buffer, Swindow_buffer, 0, 1, 0,
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       doc: /* Return the buffer that WINDOW is displaying.
WINDOW defaults to the selected window.  */)
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  (Lisp_Object window)
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{
  return decode_window (window)->buffer;
}

DEFUN ("window-height", Fwindow_height, Swindow_height, 0, 1, 0,
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       doc: /* Return the number of lines in WINDOW.
WINDOW defaults to the selected window.

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The return value includes WINDOW's mode line and header line, if any.

Note: The function does not take into account the value of `line-spacing'
when calculating the number of lines in WINDOW.  */)
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  (Lisp_Object window)
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{
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  return decode_any_window (window)->total_lines;
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}

DEFUN ("window-width", Fwindow_width, Swindow_width, 0, 1, 0,
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       doc: /* Return the number of display columns in WINDOW.
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WINDOW defaults to the selected window.

Note: The return value is the number of columns available for text in
WINDOW.  If you want to find out how many columns WINDOW takes up, use
(let ((edges (window-edges))) (- (nth 2 edges) (nth 0 edges))).  */)
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  (Lisp_Object window)
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{
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  return make_number (window_box_text_cols (decode_any_window (window)));
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}

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DEFUN ("window-full-width-p", Fwindow_full_width_p, Swindow_full_width_p, 0, 1, 0,
       doc: /* Return t if WINDOW is as wide as its frame.
WINDOW defaults to the selected window.  */)
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  (Lisp_Object window)
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{
  return WINDOW_FULL_WIDTH_P (decode_any_window (window)) ? Qt : Qnil;
}

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

DEFUN ("set-window-hscroll", Fset_window_hscroll, Sset_window_hscroll, 2, 2, 0,
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       doc: /* Set number of columns WINDOW is scrolled from left margin to NCOL.
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Return NCOL.  NCOL should be zero or positive.
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Note that if `automatic-hscrolling' is non-nil, you cannot scroll the
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window so that the location of point moves off-window.  */)
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  (Lisp_Object window, Lisp_Object ncol)
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{
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  struct window *w = decode_window (window);
  int hscroll;
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  CHECK_NUMBER (ncol);
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  hscroll = max (0, XINT (ncol));
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  /* Prevent redisplay shortcuts when changing the hscroll.  */
  if (XINT (w->hscroll) != hscroll)
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    XBUFFER (w->buffer)->prevent_redisplay_optimizations_p = 1;
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  w->hscroll = make_number (hscroll);
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  return ncol;
}

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DEFUN ("window-redisplay-end-trigger", Fwindow_redisplay_end_trigger,
       Swindow_redisplay_end_trigger, 0, 1, 0,
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       doc: /* Return WINDOW's redisplay end trigger value.
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WINDOW defaults to the selected window.
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See `set-window-redisplay-end-trigger' for more information.  */)
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  (Lisp_Object window)
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{
  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,
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       doc: /* Set WINDOW's redisplay end trigger value to VALUE.
VALUE should be a buffer position (typically a marker) or nil.
If it is a buffer position, then if redisplay in WINDOW reaches a position
beyond VALUE, the functions in `redisplay-end-trigger-functions' are called
with two arguments: WINDOW, and the end trigger value.
Afterwards the end-trigger value is reset to nil.  */)
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  (register Lisp_Object window, Lisp_Object value)
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{
  register struct window *w;

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

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DEFUN ("window-edges", Fwindow_edges, Swindow_edges, 0, 1, 0,
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       doc: /* Return a list of the edge coordinates of WINDOW.
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The list has the form (LEFT TOP RIGHT BOTTOM).
TOP and BOTTOM count by lines, and LEFT and RIGHT count by columns,
all relative to 0, 0 at top left corner of frame.

RIGHT is one more than the rightmost column occupied by WINDOW.
BOTTOM is one more than the bottommost row occupied by WINDOW.
The edges include the space used by WINDOW's scroll bar, display
margins, fringes, header line, and/or mode line.  For the edges of
just the text area, use `window-inside-edges'.  */)
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  (Lisp_Object window)
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{
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  register struct window *w = decode_any_window (window);
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  return Fcons (make_number (WINDOW_LEFT_EDGE_COL (w)),
	 Fcons (make_number (WINDOW_TOP_EDGE_LINE (w)),
	 Fcons (make_number (WINDOW_RIGHT_EDGE_COL (w)),
	 Fcons (make_number (WINDOW_BOTTOM_EDGE_LINE (w)),
		Qnil))));
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}

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DEFUN ("window-pixel-edges", Fwindow_pixel_edges, Swindow_pixel_edges, 0, 1, 0,
       doc: /* Return a list of the edge pixel coordinates of WINDOW.
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The list has the form (LEFT TOP RIGHT BOTTOM), all relative to 0, 0 at
the top left corner of the frame.

RIGHT is one more than the rightmost x position occupied by WINDOW.
BOTTOM is one more than the bottommost y position occupied by WINDOW.
The pixel edges include the space used by WINDOW's scroll bar, display
margins, fringes, header line, and/or mode line.  For the pixel edges
of just the text area, use `window-inside-pixel-edges'.  */)
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  (Lisp_Object window)
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{
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  register struct window *w = decode_any_window (window);
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  return Fcons (make_number (WINDOW_LEFT_EDGE_X (w)),
	 Fcons (make_number (WINDOW_TOP_EDGE_Y (w)),
	 Fcons (make_number (WINDOW_RIGHT_EDGE_X (w)),
	 Fcons (make_number (WINDOW_BOTTOM_EDGE_Y (w)),
		Qnil))));
}

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static void
calc_absolute_offset(struct window *w, int *add_x, int *add_y)
{
  struct frame *f = XFRAME (w->frame);
  *add_y = f->top_pos;
#ifdef FRAME_MENUBAR_HEIGHT
  *add_y += FRAME_MENUBAR_HEIGHT (f);
#endif
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#ifdef FRAME_TOOLBAR_TOP_HEIGHT
  *add_y += FRAME_TOOLBAR_TOP_HEIGHT (f);
#elif FRAME_TOOLBAR_HEIGHT
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  *add_y += FRAME_TOOLBAR_HEIGHT (f);
#endif
#ifdef FRAME_NS_TITLEBAR_HEIGHT
  *add_y += FRAME_NS_TITLEBAR_HEIGHT (f);
#endif
  *add_x = f->left_pos;
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#ifdef FRAME_TOOLBAR_LEFT_WIDTH
  *add_x += FRAME_TOOLBAR_LEFT_WIDTH (f);
#endif
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}

DEFUN ("window-absolute-pixel-edges", Fwindow_absolute_pixel_edges,
       Swindow_absolute_pixel_edges, 0, 1, 0,
       doc: /* Return a list of the edge pixel coordinates of WINDOW.
The list has the form (LEFT TOP RIGHT BOTTOM), all relative to 0, 0 at
the top left corner of the display.

RIGHT is one more than the rightmost x position occupied by WINDOW.
BOTTOM is one more than the bottommost y position occupied by WINDOW.
The pixel edges include the space used by WINDOW's scroll bar, display
margins, fringes, header line, and/or mode line.  For the pixel edges
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of just the text area, use `window-inside-absolute-pixel-edges'.  */)
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  (Lisp_Object window)
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{
  register struct window *w = decode_any_window (window);
  int add_x, add_y;
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  calc_absolute_offset (w, &add_x, &add_y);
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  return Fcons (make_number (WINDOW_LEFT_EDGE_X (w) + add_x),
         Fcons (make_number (WINDOW_TOP_EDGE_Y (w) + add_y),
	 Fcons (make_number (WINDOW_RIGHT_EDGE_X (w) + add_x),
	 Fcons (make_number (WINDOW_BOTTOM_EDGE_Y (w) + add_y),
		Qnil))));
}

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DEFUN ("window-inside-edges", Fwindow_inside_edges, Swindow_inside_edges, 0, 1, 0,
       doc: /* Return a list of the edge coordinates of WINDOW.
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The list has the form (LEFT TOP RIGHT BOTTOM).
TOP and BOTTOM count by lines, and LEFT and RIGHT count by columns,
all relative to 0, 0 at top left corner of frame.

RIGHT is one more than the rightmost column of WINDOW's text area.
BOTTOM is one more than the bottommost row of WINDOW's text area.
The inside edges do not include the space used by the WINDOW's scroll
bar, display margins, fringes, header line, and/or mode line.  */)
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  (Lisp_Object window)
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{
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  register struct window *w = decode_any_window (window);
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  return list4 (make_number (WINDOW_BOX_LEFT_EDGE_COL (w)
			     + WINDOW_LEFT_MARGIN_COLS (w)
			     + WINDOW_LEFT_FRINGE_COLS (w)),
		make_number (WINDOW_TOP_EDGE_LINE (w)
			     + WINDOW_HEADER_LINE_LINES (w)),
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		make_number (WINDOW_BOX_RIGHT_EDGE_COL (w)
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			     - WINDOW_RIGHT_MARGIN_COLS (w)
			     - WINDOW_RIGHT_FRINGE_COLS (w)),
		make_number (WINDOW_BOTTOM_EDGE_LINE (w)
			     - WINDOW_MODE_LINE_LINES (w)));
}

DEFUN ("window-inside-pixel-edges", Fwindow_inside_pixel_edges, Swindow_inside_pixel_edges, 0, 1, 0,
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       doc: /* Return a list of the edge pixel coordinates of WINDOW.
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The list has the form (LEFT TOP RIGHT BOTTOM), all relative to 0, 0 at
the top left corner of the frame.

RIGHT is one more than the rightmost x position of WINDOW's text area.
BOTTOM is one more than the bottommost y position of WINDOW's text area.
The inside edges do not include the space used by WINDOW's scroll bar,
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display margins, fringes, header line, and/or mode line.  */)
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  (Lisp_Object window)
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{
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  register struct window *w = decode_any_window (window);
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  return list4 (make_number (WINDOW_BOX_LEFT_EDGE_X (w)
			     + WINDOW_LEFT_MARGIN_WIDTH (w)
			     + WINDOW_LEFT_FRINGE_WIDTH (w)),
		make_number (WINDOW_TOP_EDGE_Y (w)
			     + WINDOW_HEADER_LINE_HEIGHT (w)),
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		make_number (WINDOW_BOX_RIGHT_EDGE_X (w)
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			     - WINDOW_RIGHT_MARGIN_WIDTH (w)
			     - WINDOW_RIGHT_FRINGE_WIDTH (w)),
		make_number (WINDOW_BOTTOM_EDGE_Y (w)
			     - WINDOW_MODE_LINE_HEIGHT (w)));
}

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DEFUN ("window-inside-absolute-pixel-edges",
       Fwindow_inside_absolute_pixel_edges,
       Swindow_inside_absolute_pixel_edges, 0, 1, 0,
       doc: /* Return a list of the edge pixel coordinates of WINDOW.
The list has the form (LEFT TOP RIGHT BOTTOM), all relative to 0, 0 at
the top left corner of the display.

RIGHT is one more than the rightmost x position of WINDOW's text area.
BOTTOM is one more than the bottommost y position of WINDOW's text area.
The inside edges do not include the space used by WINDOW's scroll bar,
display margins, fringes, header line, and/or mode line.  */)
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  (Lisp_Object window)
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{
  register struct window *w = decode_any_window (window);
  int add_x, add_y;
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  calc_absolute_offset (w, &add_x, &add_y);
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  return list4 (make_number (WINDOW_BOX_LEFT_EDGE_X (w)
			     + WINDOW_LEFT_MARGIN_WIDTH (w)
			     + WINDOW_LEFT_FRINGE_WIDTH (w) + add_x),
		make_number (WINDOW_TOP_EDGE_Y (w)
			     + WINDOW_HEADER_LINE_HEIGHT (w) + add_y),
		make_number (WINDOW_BOX_RIGHT_EDGE_X (w)
			     - WINDOW_RIGHT_MARGIN_WIDTH (w)
			     - WINDOW_RIGHT_FRINGE_WIDTH (w) + add_x),
		make_number (WINDOW_BOTTOM_EDGE_Y (w)
			     - WINDOW_MODE_LINE_HEIGHT (w) + add_y));
}

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/* Test if the character at column X, row Y is within window W.
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   If it is not, return ON_NOTHING;
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   if it is in the window's text area, return ON_TEXT;
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   if it is on the window's modeline, return ON_MODE_LINE;
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   if it is on the border between the window and its right sibling,
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      return ON_VERTICAL_BORDER.
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   if it is on a scroll bar, return ON_SCROLL_BAR.
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   if it is on the window's top line, return ON_HEADER_LINE;
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   if it is in left or right fringe of the window,
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      return ON_LEFT_FRINGE or ON_RIGHT_FRINGE;
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   if it is in the marginal area to the left/right of the window,
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      return ON_LEFT_MARGIN or ON_RIGHT_MARGIN.
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   X and Y are frame relative pixel coordinates.  */

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static enum window_part
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coordinates_in_window (register struct window *w, int x, int y)
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{
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  struct frame *f = XFRAME (WINDOW_FRAME (w));
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  int left_x, right_x;
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  enum window_part part;
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  int ux = FRAME_COLUMN_WIDTH (f);
  int x0 = WINDOW_LEFT_EDGE_X (w);
  int x1 = WINDOW_RIGHT_EDGE_X (w);
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  /* The width of the area where the vertical line can be dragged.
     (Between mode lines for instance.  */
  int grabbable_width = ux;
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  int lmargin_width, rmargin_width, text_left, text_right;
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  int top_y = WINDOW_TOP_EDGE_Y (w);
  int bottom_y = WINDOW_BOTTOM_EDGE_Y (w);

  /* Outside any interesting row?  */
  if (y < top_y || y >= bottom_y)
    return ON_NOTHING;
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  /* 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.  */
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  if (w->pseudo_window_p)
    {
      left_x = 0;
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      right_x = WINDOW_TOTAL_WIDTH (w) - 1;
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    }
  else
    {
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      left_x = WINDOW_BOX_LEFT_EDGE_X (w);
      right_x = WINDOW_BOX_RIGHT_EDGE_X (w) - 1;
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    }
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  /* 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.  */
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  if (WINDOW_WANTS_MODELINE_P (w)
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      && y >= bottom_y - CURRENT_MODE_LINE_HEIGHT (w))
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    {
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      part = ON_MODE_LINE;

    header_vertical_border_check:
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      /* We're somewhere on the mode line.  We consider the place
	 between mode lines of horizontally adjacent mode lines
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	 as the vertical border.  If scroll bars on the left,
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	 return the right window.  */
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      if ((WINDOW_HAS_VERTICAL_SCROLL_BAR_ON_LEFT (w)
	   || WINDOW_RIGHTMOST_P (w))
	  && !WINDOW_LEFTMOST_P (w)
	  && eabs (x - x0) < grabbable_width)
	return ON_VERTICAL_BORDER;

      /* Make sure we're not at the rightmost position of a
	 mode-/header-line and there's yet another window on the
	 right.  (Bug#1372)  */
      else if ((WINDOW_RIGHTMOST_P (w) || x < x1)
	       && eabs (x - x1) < grabbable_width)
	return ON_VERTICAL_BORDER;

      if (x < x0 || x >= x1)
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	return ON_NOTHING;

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      return part;
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    }
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  if (WINDOW_WANTS_HEADER_LINE_P (w)
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      && y < top_y + CURRENT_HEADER_LINE_HEIGHT (w))
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    {
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      part = ON_HEADER_LINE;
      goto header_vertical_border_check;
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    }
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  if (x < x0 || x >= x1) return ON_NOTHING;
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  /* Outside any interesting column?  */
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  if (x < left_x || x > right_x)
    return ON_SCROLL_BAR;
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  lmargin_width = window_box_width (w, LEFT_MARGIN_AREA);
  rmargin_width = window_box_width (w, RIGHT_MARGIN_AREA);
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  text_left = window_box_left (w, TEXT_AREA);
  text_right = text_left + window_box_width (w, TEXT_AREA);

  if (FRAME_WINDOW_P (f))
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    {
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      if (!w->pseudo_window_p
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	  && !WINDOW_HAS_VERTICAL_SCROLL_BAR (w)
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	  && !WINDOW_RIGHTMOST_P (w)
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	  && (eabs (x - right_x) < grabbable_width))
	return ON_VERTICAL_BORDER;
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    }
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  /* Need to say "x > right_x" rather than >=, since on character
     terminals, the vertical line's x coordinate is right_x.  */
  else if (!w->pseudo_window_p
	   && !WINDOW_RIGHTMOST_P (w)
	   && x > right_x - ux)
    return ON_VERTICAL_BORDER;

  if (x < text_left)
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    {
      if (lmargin_width > 0
	  && (WINDOW_HAS_FRINGES_OUTSIDE_MARGINS (w)
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	      ? (x >= left_x + WINDOW_LEFT_FRINGE_WIDTH (w))
	      : (x < left_x + lmargin_width)))
	return ON_LEFT_MARGIN;

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      return ON_LEFT_FRINGE;
    }

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  if (x >= text_right)
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    {
      if (rmargin_width > 0
	  && (WINDOW_HAS_FRINGES_OUTSIDE_MARGINS (w)
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	      ? (x < right_x - WINDOW_RIGHT_FRINGE_WIDTH (w))
	      : (x >= right_x - rmargin_width)))
	return ON_RIGHT_MARGIN;

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      return ON_RIGHT_FRINGE;
    }

  /* Everything special ruled out - must be on text area */
  return ON_TEXT;
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}

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/* Take X is the frame-relative pixel x-coordinate, and return the
   x-coordinate relative to part PART of window W. */
int
window_relative_x_coord (struct window *w, enum window_part part, int x)
{
  int left_x = (w->pseudo_window_p) ? 0 : WINDOW_BOX_LEFT_EDGE_X (w);

  switch (part)
    {
    case ON_TEXT:
      return x - window_box_left (w, TEXT_AREA);

    case ON_LEFT_FRINGE:
      return x - left_x;

    case ON_RIGHT_FRINGE:
      return x - left_x - WINDOW_LEFT_FRINGE_WIDTH (w);

    case ON_LEFT_MARGIN:
      return (x - left_x
	      - ((WINDOW_HAS_FRINGES_OUTSIDE_MARGINS (w))
		 ? WINDOW_LEFT_FRINGE_WIDTH (w) : 0));

    case ON_RIGHT_MARGIN:
      return (x + 1
	      - ((w->pseudo_window_p)
		 ? WINDOW_TOTAL_WIDTH (w)
		 : WINDOW_BOX_RIGHT_EDGE_X (w))
	      + window_box_width (w, RIGHT_MARGIN_AREA)
	      + ((WINDOW_HAS_FRINGES_OUTSIDE_MARGINS (w))
		 ? WINDOW_RIGHT_FRINGE_WIDTH (w) : 0));
    }

  /* ON_SCROLL_BAR, ON_NOTHING, and ON_VERTICAL_BORDER:  */
  return 0;
}

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DEFUN ("coordinates-in-window-p", Fcoordinates_in_window_p,
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       Scoordinates_in_window_p, 2, 2, 0,
       doc: /* Return non-nil if COORDINATES are in WINDOW.
COORDINATES is a cons of the form (X . Y), X and Y being distances
measured in characters from the upper-left corner of the frame.
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\(0 . 0) denotes the character in the upper left corner of the
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frame.
If COORDINATES are in the text portion of WINDOW,
   the coordinates relative to the window are returned.
If they are in the mode line of WINDOW, `mode-line' is returned.
If they are in the top mode line of WINDOW, `header-line' is returned.
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If they are in the left fringe of WINDOW, `left-fringe' is returned.
If they are in the right fringe of WINDOW, `right-fringe' is returned.
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If they are on the border between WINDOW and its right sibling,
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  `vertical-line' is returned.
If they are in the windows's left or right marginal areas, `left-margin'\n\
  or `right-margin' is returned.  */)
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  (register Lisp_Object coordinates, Lisp_Object window)
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{
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  struct window *w;
  struct frame *f;
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  int x, y;
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  Lisp_Object lx, ly;
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  CHECK_WINDOW (window);
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  w = XWINDOW (window);
  f = XFRAME (w->frame);
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  CHECK_CONS (coordinates);
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  lx = Fcar (coordinates);
  ly = Fcdr (coordinates);
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  CHECK_NUMBER_OR_FLOAT (lx);
  CHECK_NUMBER_OR_FLOAT (ly);
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  x = FRAME_PIXEL_X_FROM_CANON_X (f, lx) + FRAME_INTERNAL_BORDER_WIDTH (f);
  y = FRAME_PIXEL_Y_FROM_CANON_Y (f, ly) + FRAME_INTERNAL_BORDER_WIDTH (f);
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  switch (coordinates_in_window (w, x, y))
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    {
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    case ON_NOTHING:
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      return Qnil;

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    case ON_TEXT:
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      /* Convert X and Y to window relative pixel coordinates, and
	 return the canonical char units.  */
      x -= window_box_left (w, TEXT_AREA);
      y -= WINDOW_TOP_EDGE_Y (w);
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      return Fcons (FRAME_CANON_X_FROM_PIXEL_X (f, x),
		    FRAME_CANON_Y_FROM_PIXEL_Y (f, y));
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    case ON_MODE_LINE:
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      return Qmode_line;
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    case ON_VERTICAL_BORDER:
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      return Qvertical_line;
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    case ON_HEADER_LINE:
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      return Qheader_line;
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    case ON_LEFT_FRINGE:
      return Qleft_fringe;
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    case ON_RIGHT_FRINGE:
      return Qright_fringe;
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    case ON_LEFT_MARGIN:
      return Qleft_margin;
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    case ON_RIGHT_MARGIN:
      return Qright_margin;

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    case ON_SCROLL_BAR:
      /* Historically we are supposed to return nil in this case.  */
      return Qnil;

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    default:
      abort ();
    }
}

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/* Callback for foreach_window, used in window_from_coordinates.
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   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
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   *CW->part the part of the window under coordinates *X,*Y.  Return
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   zero from this function to stop iterating over windows.  */

struct check_window_data
{
  Lisp_Object *window;
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  int x, y;
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  enum window_part *part;
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};
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static int
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check_window_containing (struct window *w, void *user_data)
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{
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  struct check_window_data *cw = (struct check_window_data *) user_data;
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  enum window_part found;
  int continue_p = 1;
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  found = coordinates_in_window (w, cw->x, cw->y);
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  if (found != ON_NOTHING)
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    {
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      *cw->part = found;
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      XSETWINDOW (*cw->window, w);
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      continue_p = 0;
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    }
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  return continue_p;
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}


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/* Find the window containing frame-relative pixel position X/Y and
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   return it as a Lisp_Object.

   If X, Y is on one of the window's special `window_part' elements,
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   set *PART to the id of that element.
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   If there is no window under X, Y return nil and leave *PART
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