src/termhooks.h

   1 /* Hooks by which low level terminal operations
   2    can be made to call other routines.
   3    Copyright (C) 1985, 1986, 1993, 1994 Free Software Foundation, Inc.
   4
   5 This file is part of GNU Emacs.
   6
   7 GNU Emacs is free software; you can redistribute it and/or modify
   8 it under the terms of the GNU General Public License as published by
   9 the Free Software Foundation; either version 2, or (at your option)
  10 any later version.
  11
  12 GNU Emacs is distributed in the hope that it will be useful,
  13 but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 GNU General Public License for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with GNU Emacs; see the file COPYING.  If not, write to
  19 the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  20 Boston, MA 02111-1307, USA.  */
  21
  22 \f
  23 /* Miscellanea.   */
  24
  25 /* If nonzero, send all terminal output characters to this stream also.  */
  26 extern FILE *termscript;
  27
  28 \f
  29 /* Text display hooks.  */
  30
  31 extern int (*cursor_to_hook) ();
  32 extern int (*raw_cursor_to_hook) ();
  33
  34 extern int (*clear_to_end_hook) ();
  35 extern int (*clear_frame_hook) ();
  36 extern int (*clear_end_of_line_hook) ();
  37
  38 extern int (*ins_del_lines_hook) ();
  39
  40 extern int (*change_line_highlight_hook) ();
  41 extern int (*reassert_line_highlight_hook) ();
  42
  43 extern int (*insert_glyphs_hook) ();
  44 extern int (*write_glyphs_hook) ();
  45 extern int (*delete_glyphs_hook) ();
  46
  47 extern int (*ring_bell_hook) ();
  48
  49 extern int (*reset_terminal_modes_hook) ();
  50 extern int (*set_terminal_modes_hook) ();
  51 extern int (*update_begin_hook) ();
  52 extern int (*update_end_hook) ();
  53 extern int (*set_terminal_window_hook) ();
  54
  55
  56 \f
  57 /* Multi-frame and mouse support hooks.  */
  58
  59 enum scroll_bar_part {
  60   scroll_bar_above_handle,
  61   scroll_bar_handle,
  62   scroll_bar_below_handle,
  63   scroll_bar_up_arrow,
  64   scroll_bar_down_arrow
  65 };
  66
  67 /* Return the current position of the mouse.
  68
  69    Set *f to the frame the mouse is in, or zero if the mouse is in no
  70    Emacs frame.  If it is set to zero, all the other arguments are
  71    garbage.
  72
  73    If the motion started in a scroll bar, set *bar_window to the
  74    scroll bar's window, *part to the part the mouse is currently over,
  75    *x to the position of the mouse along the scroll bar, and *y to the
  76    overall length of the scroll bar.
  77
  78    Otherwise, set *bar_window to Qnil, and *x and *y to the column and
  79    row of the character cell the mouse is over.
  80
  81    Set *time to the time the mouse was at the returned position.
  82
  83    This should clear mouse_moved until the next motion
  84    event arrives.  */
  85 extern void (*mouse_position_hook) ( /* FRAME_PTR *f,
  86                                         Lisp_Object *bar_window,
  87                                         enum scroll_bar_part *part,
  88                                         Lisp_Object *x,
  89                                         Lisp_Object *y,
  90                                         unsigned long *time */ );
  91
  92 /* The window system handling code should set this if the mouse has
  93    moved since the last call to the mouse_position_hook.  Calling that
  94    hook should clear this.  */
  95 extern int mouse_moved;
  96
  97 /* When a frame's focus redirection is changed, this hook tells the
  98    window system code to re-decide where to put the highlight.  Under
  99    X, this means that Emacs lies about where the focus is.  */
 100 extern void (*frame_rehighlight_hook) ( /* void */ );
 101
 102 /* If we're displaying frames using a window system that can stack
 103    frames on top of each other, this hook allows you to bring a frame
 104    to the front, or bury it behind all the other windows.  If this
 105    hook is zero, that means the device we're displaying on doesn't
 106    support overlapping frames, so there's no need to raise or lower
 107    anything.
 108
 109    If RAISE is non-zero, F is brought to the front, before all other
 110    windows.  If RAISE is zero, F is sent to the back, behind all other
 111    windows.  */
 112 extern void (*frame_raise_lower_hook) ( /* FRAME_PTR f, int raise */ );
 113
 114 \f
 115 /* Scroll bar hooks.  */
 116
 117 /* The representation of scroll bars is determined by the code which
 118    implements them, except for one thing: they must be represented by
 119    lisp objects.  This allows us to place references to them in
 120    Lisp_Windows without worrying about those references becoming
 121    dangling references when the scroll bar is destroyed.
 122
 123    The window-system-independent portion of Emacs just refers to
 124    scroll bars via their windows, and never looks inside the scroll bar
 125    representation; it always uses hook functions to do all the
 126    scroll bar manipulation it needs.
 127
 128    The `vertical_scroll_bar' field of a Lisp_Window refers to that
 129    window's scroll bar, or is nil if the window doesn't have a
 130    scroll bar.
 131
 132    The `scroll_bars' and `condemned_scroll_bars' fields of a Lisp_Frame
 133    are free for use by the scroll bar implementation in any way it sees
 134    fit.  They are marked by the garbage collector.  */
 135
 136
 137 /* Set the vertical scroll bar for WINDOW to have its upper left corner
 138    at (TOP, LEFT), and be LENGTH rows high.  Set its handle to
 139    indicate that we are displaying PORTION characters out of a total
 140    of WHOLE characters, starting at POSITION.  If WINDOW doesn't yet
 141    have a scroll bar, create one for it.  */
 142 extern void (*set_vertical_scroll_bar_hook)
 143             ( /* struct window *window,
 144                  int portion, int whole, int position */ );
 145
 146
 147 /* The following three hooks are used when we're doing a thorough
 148    redisplay of the frame.  We don't explicitly know which scroll bars
 149    are going to be deleted, because keeping track of when windows go
 150    away is a real pain - can you say set-window-configuration?
 151    Instead, we just assert at the beginning of redisplay that *all*
 152    scroll bars are to be removed, and then save scroll bars from the
 153    fiery pit when we actually redisplay their window.  */
 154
 155 /* Arrange for all scroll bars on FRAME to be removed at the next call
 156    to `*judge_scroll_bars_hook'.  A scroll bar may be spared if
 157    `*redeem_scroll_bar_hook' is applied to its window before the judgement.
 158
 159    This should be applied to each frame each time its window tree is
 160    redisplayed, even if it is not displaying scroll bars at the moment;
 161    if the HAS_SCROLL_BARS flag has just been turned off, only calling
 162    this and the judge_scroll_bars_hook will get rid of them.
 163
 164    If non-zero, this hook should be safe to apply to any frame,
 165    whether or not it can support scroll bars, and whether or not it is
 166    currently displaying them.  */
 167 extern void (*condemn_scroll_bars_hook)( /* FRAME_PTR *frame */ );
 168
 169 /* Unmark WINDOW's scroll bar for deletion in this judgement cycle.
 170    Note that it's okay to redeem a scroll bar that is not condemned.  */
 171 extern void (*redeem_scroll_bar_hook)( /* struct window *window */ );
 172
 173 /* Remove all scroll bars on FRAME that haven't been saved since the
 174    last call to `*condemn_scroll_bars_hook'.
 175
 176    This should be applied to each frame after each time its window
 177    tree is redisplayed, even if it is not displaying scroll bars at the
 178    moment; if the HAS_SCROLL_BARS flag has just been turned off, only
 179    calling this and condemn_scroll_bars_hook will get rid of them.
 180
 181    If non-zero, this hook should be safe to apply to any frame,
 182    whether or not it can support scroll bars, and whether or not it is
 183    currently displaying them.  */
 184 extern void (*judge_scroll_bars_hook)( /* FRAME_PTR *FRAME */ );
 185
 186 \f
 187 /* Input queue declarations and hooks.  */
 188
 189 /* Called to read input events.  */
 190 extern int (*read_socket_hook) ();
 191
 192 /* Called when a frame's display becomes entirely up to date.  */
 193 extern int (*frame_up_to_date_hook) ();
 194
 195 /* Expedient hack: only provide the below definitions to files that
 196    are prepared to handle lispy things.  CONSP is defined iff lisp.h
 197    has been included before this file.  */
 198 #ifdef CONSP
 199
 200 enum event_kind
 201 {
 202   no_event,                     /* nothing happened.  This should never
 203                                    actually appear in the event queue.  */
 204
 205   ascii_keystroke,              /* The ASCII code is in .code, perhaps
 206                                    with modifiers applied.
 207                                    .modifiers holds the state of the
 208                                    modifier keys.
 209                                    .frame_or_window is the frame in
 210                                    which the key was typed.
 211                                    .timestamp gives a timestamp (in
 212                                    milliseconds) for the keystroke.  */
 213   non_ascii_keystroke,          /* .code is a number identifying the
 214                                    function key.  A code N represents
 215                                    a key whose name is
 216                                    function_key_names[N]; function_key_names
 217                                    is a table in keyboard.c to which you
 218                                    should feel free to add missing keys.
 219                                    .modifiers holds the state of the
 220                                    modifier keys.
 221                                    .frame_or_window is the frame in
 222                                    which the key was typed.
 223                                    .timestamp gives a timestamp (in
 224                                    milliseconds) for the keystroke.  */
 225   timer_event,                  /* A timer fired.  */
 226   mouse_click,                  /* The button number is in .code; it must
 227                                    be >= 0 and < NUM_MOUSE_BUTTONS, defined
 228                                    below.
 229                                    .modifiers holds the state of the
 230                                    modifier keys.
 231                                    .x and .y give the mouse position,
 232                                    in characters, within the window.
 233                                    .frame_or_window gives the frame
 234                                    the mouse click occurred in.
 235                                    .timestamp gives a timestamp (in
 236                                    milliseconds) for the click.  */
 237   scroll_bar_click,             /* .code gives the number of the mouse button
 238                                    that was clicked.
 239                                    .modifiers holds the state of the modifier
 240                                    keys.
 241                                    .part is a lisp symbol indicating which
 242                                    part of the scroll bar got clicked.
 243                                    .x gives the distance from the start of the
 244                                    scroll bar of the click; .y gives the total
 245                                    length of the scroll bar.
 246                                    .frame_or_window gives the window
 247                                    whose scroll bar was clicked in.
 248                                    .timestamp gives a timestamp (in
 249                                    milliseconds) for the click.  */
 250 #ifdef WINDOWSNT
 251   w32_scroll_bar_click, /* as for scroll_bar_click, but only generated
 252                                    by MS-Windows scroll bar controls. */
 253 #endif
 254   selection_request_event,      /* Another X client wants a selection from us.
 255                                    See `struct selection_event'.  */
 256   selection_clear_event,        /* Another X client cleared our selection.  */
 257   buffer_switch_event,          /* A process filter has switched buffers.  */
 258   delete_window_event,          /* An X client said "delete this window".  */
 259   menu_bar_event,               /* An event generated by the menu bar.
 260                                    The frame_or_window field's cdr holds the
 261                                    Lisp-level event value.
 262                                    (Only the toolkit version uses these.)  */
 263   iconify_event,                /* An X client iconified this window.  */
 264   deiconify_event,              /* An X client deiconified this window.  */
 265   menu_bar_activate_event       /* A button press in the menu bar
 266                                    (toolkit version only).  */
 267 };
 268
 269 /* If a struct input_event has a kind which is selection_request_event
 270    or selection_clear_event, then its contents are really described
 271    by `struct selection_event'; see xterm.h.  */
 272
 273 /* The keyboard input buffer is an array of these structures.  Each one
 274    represents some sort of input event - a keystroke, a mouse click, or
 275    a window system event.  These get turned into their lispy forms when
 276    they are removed from the event queue.  */
 277
 278 struct input_event
 279 {
 280
 281   /* What kind of event was this?  */
 282   int kind;
 283
 284   /* For an ascii_keystroke, this is the character.
 285      For a non_ascii_keystroke, this is the keysym code.
 286      For a mouse event, this is the button number.  */
 287   int code;
 288   enum scroll_bar_part part;
 289
 290   int modifiers;                /* See enum below for interpretation.  */
 291
 292   Lisp_Object x, y;
 293   unsigned long timestamp;
 294
 295   /* This is padding just to put the frame_or_window field
 296      past the size of struct selection_event.  */
 297   int *padding[2];
 298
 299   /* This field is copied into a vector while the event is in the queue,
 300      so that garbage collections won't kill it.  */
 301   /* In a menu_bar_event, this is a cons cell whose car is the frame
 302      and whose cdr is the Lisp object that is the event's value.  */
 303   /* This field is last so that struct selection_input_event
 304      does not overlap with it.  */
 305   Lisp_Object frame_or_window;
 306 };
 307 \f
 308 /* This is used in keyboard.c, to tell how many buttons we will need
 309    to track the positions of.  */
 310 #define NUM_MOUSE_BUTTONS (5)
 311
 312 /* Bits in the modifiers member of the input_event structure.
 313    Note that reorder_modifiers assumes that the bits are in canonical
 314    order.
 315
 316    The modifiers applied to mouse clicks are rather ornate.  The
 317    window-system-specific code should store mouse clicks with
 318    up_modifier or down_modifier set.  Having an explicit down modifier
 319    simplifies some of window-system-independent code; without it, the
 320    code would have to recognize down events by checking if the event
 321    is a mouse click lacking the click and drag modifiers.
 322
 323    The window-system independent code turns all up_modifier events
 324    bits into drag_modifier, click_modifier, double_modifier, or
 325    triple_modifier events.  The click_modifier has no written
 326    representation in the names of the symbols used as event heads,
 327    but it does appear in the Qevent_symbol_components property of the
 328    event heads.  */
 329 enum {
 330   up_modifier   =   1,          /* Only used on mouse buttons - always
 331                                    turned into a click or a drag modifier
 332                                    before lisp code sees the event.  */
 333   down_modifier =   2,          /* Only used on mouse buttons.  */
 334   drag_modifier =   4,          /* This is never used in the event
 335                                    queue; it's only used internally by
 336                                    the window-system-independent code.  */
 337   click_modifier=   8,          /* See drag_modifier.  */
 338   double_modifier= 16,          /* See drag_modifier.  */
 339   triple_modifier= 32,          /* See drag_modifier.  */
 340
 341   /* The next four modifier bits are used also in keyboard events at
 342      the Lisp level.
 343
 344      It's probably not the greatest idea to use the 2^23 bit for any
 345      modifier.  It may or may not be the sign bit, depending on
 346      VALBITS, so using it to represent a modifier key means that
 347      characters thus modified have different integer equivalents
 348      depending on the architecture they're running on.  Oh, and
 349      applying XINT to a character whose 2^23 bit is set sign-extends
 350      it, so you get a bunch of bits in the mask you didn't want.
 351
 352      The CHAR_ macros are defined in lisp.h.  */
 353   alt_modifier  =  CHAR_ALT,    /* Under X, the XK_Alt_[LR] keysyms.  */
 354   super_modifier=  CHAR_SUPER,  /* Under X, the XK_Super_[LR] keysyms.  */
 355   hyper_modifier=  CHAR_HYPER,  /* Under X, the XK_Hyper_[LR] keysyms.  */
 356   shift_modifier=  CHAR_SHIFT,
 357   ctrl_modifier =  CHAR_CTL,
 358   meta_modifier =  CHAR_META    /* Under X, the XK_Meta_[LR] keysyms.  */
 359 };
 360
 361 #endif