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284f4730 | 1 | /* Declarations useful when processing input. |
c6c5df7f | 2 | Copyright (C) 1985, 1986, 1987, 1993 Free Software Foundation, Inc. |
284f4730 JB |
3 | |
4 | This file is part of GNU Emacs. | |
5 | ||
6 | GNU Emacs is free software; you can redistribute it and/or modify | |
7 | it under the terms of the GNU General Public License as published by | |
e5d77022 | 8 | the Free Software Foundation; either version 2, or (at your option) |
284f4730 JB |
9 | any later version. |
10 | ||
11 | GNU Emacs is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | GNU General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
17 | along with GNU Emacs; see the file COPYING. If not, write to | |
3b7ad313 EN |
18 | the Free Software Foundation, Inc., 59 Temple Place - Suite 330, |
19 | Boston, MA 02111-1307, USA. */ | |
284f4730 | 20 | |
931e7866 RS |
21 | /* Length of echobuf field in each KBOARD. */ |
22 | ||
23 | #define ECHOBUFSIZE 300 | |
24 | ||
25 | /* Each KBOARD represents one logical input stream from which Emacs gets input. | |
26 | If we are using an ordinary terminal, it has one KBOARD object. | |
27 | Usually each X display screen has its own KBOARD, | |
28 | but when two of them are on the same X server, | |
29 | we assume they share a keyboard and give them one KBOARD in common. | |
30 | ||
31 | Some Lisp variables are per-kboard; they are stored in the KBOARD structure | |
32 | and accessed indirectly via a Lisp_Misc_Kboard_Objfwd object. | |
33 | ||
34 | So that definition of keyboard macros, and reading of prefix arguments, | |
35 | can happen in parallel on various KBOARDs at once, | |
36 | the state information for those activities is stored in the KBOARD. | |
37 | ||
38 | Emacs has two states for reading input: | |
39 | ||
40 | ** Any kboard. Emacs can accept input from any KBOARD, | |
41 | and as soon as any of them provides a complete command, Emacs can run it. | |
42 | ||
43 | ** Single kboard. Then Emacs is running a command for one KBOARD | |
44 | and can only read input from that KBOARD. | |
45 | ||
46 | All input, from all KBOARDs, goes together in a single event queue | |
47 | at interrupt level. read_char sees the events sequentially, | |
48 | but deals with them in accord with the current input state. | |
49 | ||
50 | In the any-kboard state, read_key_sequence processes input from any KBOARD | |
51 | immediately. When a new event comes in from a particular KBOARD, | |
52 | read_key_sequence switches to that KBOARD. As a result, | |
53 | as soon as a complete key arrives from some KBOARD or other, | |
54 | Emacs starts executing that key's binding. It switches to the | |
55 | single-kboard state for the execution of that command, | |
56 | so that that command can get input only from its own KBOARD. | |
57 | ||
58 | While in the single-kboard state, read_char can consider input only | |
59 | from the current KBOARD. If events come from other KBOARDs, they | |
60 | are put aside for later in the KBOARDs' kbd_queue lists. | |
61 | The flag kbd_queue_has_data in a KBOARD is 1 if this has happened. | |
62 | When Emacs goes back to the any-kboard state, it looks at all the KBOARDS | |
63 | to find those; and it tries processing their input right away. */ | |
64 | ||
65 | typedef struct kboard KBOARD; | |
66 | struct kboard | |
67 | { | |
68 | KBOARD *next_kboard; | |
69 | ||
063c96e6 KH |
70 | /* If non-nil, a keymap that overrides all others but applies only to |
71 | this KBOARD. Lisp code that uses this instead of calling read-char | |
72 | can effectively wait for input in the any-kboard state, and hence | |
73 | avoid blocking out the other KBOARDs. See universal-argument in | |
74 | lisp/simple.el for an example. */ | |
75 | Lisp_Object Voverriding_terminal_local_map; | |
76 | ||
334a398c KH |
77 | /* Last command executed by the editor command loop, not counting |
78 | commands that set the prefix argument. */ | |
79 | Lisp_Object Vlast_command; | |
80 | ||
d94a2d9a RS |
81 | /* Normally same as last-command, but never modified by |
82 | other commands. */ | |
83 | Lisp_Object Vreal_last_command; | |
84 | ||
7e926407 KH |
85 | /* The prefix argument for the next command, in raw form. */ |
86 | Lisp_Object Vprefix_arg; | |
d94a2d9a RS |
87 | |
88 | /* Saved prefix argument for the last command, in raw form. */ | |
89 | Lisp_Object Vlast_prefix_arg; | |
931e7866 RS |
90 | |
91 | /* Unread events specific to this kboard. */ | |
92 | Lisp_Object kbd_queue; | |
93 | ||
94 | /* Non-nil while a kbd macro is being defined. */ | |
95 | Lisp_Object defining_kbd_macro; | |
96 | ||
97 | /* The start of storage for the current keyboard macro. */ | |
98 | Lisp_Object *kbd_macro_buffer; | |
99 | ||
100 | /* Where to store the next keystroke of the macro. */ | |
101 | Lisp_Object *kbd_macro_ptr; | |
102 | ||
103 | /* The finalized section of the macro starts at kbd_macro_buffer and | |
104 | ends before this. This is not the same as kbd_macro_ptr, because | |
105 | we advance this to kbd_macro_ptr when a key's command is complete. | |
106 | This way, the keystrokes for "end-kbd-macro" are not included in the | |
107 | macro. */ | |
108 | Lisp_Object *kbd_macro_end; | |
109 | ||
110 | /* Allocated size of kbd_macro_buffer. */ | |
111 | int kbd_macro_bufsize; | |
112 | ||
113 | /* Last anonymous kbd macro defined. */ | |
114 | Lisp_Object Vlast_kbd_macro; | |
115 | ||
be2f0083 KH |
116 | /* Alist of system-specific X windows key symbols. */ |
117 | Lisp_Object Vsystem_key_alist; | |
118 | ||
8955bab8 KH |
119 | /* Cache for modify_event_symbol. */ |
120 | Lisp_Object system_key_syms; | |
121 | ||
2db45b7b KH |
122 | /* Minibufferless frames on this display use this frame's minibuffer. */ |
123 | Lisp_Object Vdefault_minibuffer_frame; | |
124 | ||
931e7866 RS |
125 | /* Number of displays using this KBOARD. Normally 1, but can be |
126 | larger when you have multiple screens on a single X display. */ | |
127 | int reference_count; | |
128 | ||
129 | /* Where to append more text to echobuf if we want to. */ | |
130 | char *echoptr; | |
131 | ||
132 | /* The text we're echoing in the modeline - partial key sequences, | |
133 | usually. '\0'-terminated. This really shouldn't have a fixed size. */ | |
134 | char echobuf[ECHOBUFSIZE]; | |
135 | ||
136 | /* This flag indicates that events were put into kbd_queue | |
137 | while Emacs was running for some other KBOARD. | |
138 | The flag means that, when Emacs goes into the any-kboard state again, | |
139 | it should check this KBOARD to see if there is a complete command | |
140 | waiting. | |
141 | ||
142 | Note that the kbd_queue field can be non-nil even when | |
143 | kbd_queue_has_data is 0. When we push back an incomplete | |
144 | command, then this flag is 0, meaning we don't want to try | |
145 | reading from this KBOARD again until more input arrives. */ | |
146 | char kbd_queue_has_data; | |
147 | ||
148 | /* Nonzero means echo each character as typed. */ | |
149 | char immediate_echo; | |
150 | ||
151 | /* If we have echoed a prompt string specified by the user, | |
152 | this is its length. Otherwise this is -1. */ | |
153 | char echo_after_prompt; | |
154 | }; | |
155 | ||
156 | #ifdef MULTI_KBOARD | |
157 | /* Temporarily used before a frame has been opened, and for termcap frames */ | |
158 | extern KBOARD *initial_kboard; | |
159 | ||
160 | /* In the single-kboard state, this is the kboard | |
161 | from which input is accepted. | |
162 | ||
163 | In the any-kboard state, this is the kboard from which we are | |
164 | right now considering input. We can consider input from another | |
165 | kboard, but doing so requires throwing to wrong_kboard_jmpbuf. */ | |
166 | extern KBOARD *current_kboard; | |
167 | ||
168 | /* A list of all kboard objects, linked through next_kboard. */ | |
169 | extern KBOARD *all_kboards; | |
170 | ||
171 | /* Nonzero in the single-kboard state, 0 in the any-kboard state. */ | |
172 | extern int single_kboard; | |
173 | #else | |
174 | extern KBOARD the_only_kboard; | |
175 | #define current_kboard (&the_only_kboard) | |
176 | #define all_kboards (&the_only_kboard) | |
177 | #define single_kboard 1 | |
178 | #endif | |
179 | \f | |
18afd477 KH |
180 | extern Lisp_Object Vlucid_menu_bar_dirty_flag; |
181 | extern Lisp_Object Qrecompute_lucid_menubar, Qactivate_menubar_hook; | |
182 | ||
284f4730 | 183 | /* Total number of times read_char has returned. */ |
6c747f30 | 184 | extern int num_input_events; |
284f4730 | 185 | |
0ca96cef | 186 | /* Total number of times read_char has returned, outside of macros. */ |
6c747f30 | 187 | extern int num_nonmacro_input_events; |
0ca96cef | 188 | |
eb8c3be9 | 189 | /* Nonzero means polling for input is temporarily suppressed. */ |
284f4730 JB |
190 | extern int poll_suppress_count; |
191 | ||
3b0deae5 RS |
192 | /* Nonzero if polling_for_input is actually being used. */ |
193 | extern int polling_for_input; | |
194 | ||
284f4730 JB |
195 | /* Keymap mapping ASCII function key sequences onto their preferred forms. |
196 | Initialized by the terminal-specific lisp files. */ | |
197 | extern Lisp_Object Vfunction_key_map; | |
198 | ||
49fcd3de JB |
199 | /* Vector holding the key sequence that invoked the current command. |
200 | It is reused for each command, and it may be longer than the current | |
201 | sequence; this_command_key_count indicates how many elements | |
202 | actually mean something. */ | |
203 | extern Lisp_Object this_command_keys; | |
204 | extern int this_command_key_count; | |
6084b314 | 205 | |
fd2777e0 JB |
206 | /* The frame in which the last input event occurred, or Qmacro if the |
207 | last event came from a macro. We use this to determine when to | |
208 | generate switch-frame events. This may be cleared by functions | |
209 | like Fselect_frame, to make sure that a switch-frame event is | |
210 | generated by the next character. */ | |
9e6314a4 | 211 | extern Lisp_Object internal_last_event_frame; |
284f4730 | 212 | \f |
0340dc60 RS |
213 | /* This holds a Lisp vector that holds the properties of a single |
214 | menu item while decoding it in parse_menu_item. | |
215 | Using a Lisp vector to hold this information while we decode it | |
216 | takes care of protecting all the data from GC. */ | |
217 | extern Lisp_Object item_properties; | |
218 | ||
219 | /* This describes the elements of item_properties. | |
220 | The first element is not a property, it is a pointer to the item properties | |
221 | that is saved for GC protection. */ | |
222 | #define ITEM_PROPERTY_ITEM 0 | |
223 | /* The item string. */ | |
224 | #define ITEM_PROPERTY_NAME 1 | |
225 | /* Start of initilize to nil */ | |
226 | /* The binding: nil, a command or a keymap. */ | |
227 | #define ITEM_PROPERTY_DEF 2 | |
228 | /* The keymap if the binding is a keymap, otherwise nil. */ | |
229 | #define ITEM_PROPERTY_MAP 3 | |
230 | /* Nil, :radio or :toggle. */ | |
231 | #define ITEM_PROPERTY_TYPE 4 | |
232 | /* Nil or a string describing an equivalent key binding. */ | |
233 | #define ITEM_PROPERTY_KEYEQ 5 | |
234 | /* Not nil if a selected toggle box or radio button, otherwise nil. */ | |
235 | #define ITEM_PROPERTY_SELECTED 6 | |
236 | /* Place for a help string. Not yet used. */ | |
237 | #define ITEM_PROPERTY_HELP 7 | |
238 | /* Start of initilize to t */ | |
239 | /* Last property. */ | |
240 | /* Not nil if item is enabled. */ | |
241 | #define ITEM_PROPERTY_ENABLE 8 | |
242 | \f | |
284f4730 JB |
243 | /* Macros for dealing with lispy events. */ |
244 | ||
245 | /* True iff EVENT has data fields describing it (i.e. a mouse click). */ | |
4a2fb8bd | 246 | #define EVENT_HAS_PARAMETERS(event) (CONSP (event)) |
284f4730 | 247 | |
53ce28d6 JB |
248 | /* Extract the head from an event. |
249 | This works on composite and simple events. */ | |
ac501cd9 JB |
250 | #define EVENT_HEAD(event) \ |
251 | (EVENT_HAS_PARAMETERS (event) ? XCONS (event)->car : (event)) | |
252 | ||
53ce28d6 | 253 | /* Extract the starting and ending positions from a composite event. */ |
ac501cd9 JB |
254 | #define EVENT_START(event) (XCONS (XCONS (event)->cdr)->car) |
255 | #define EVENT_END(event) (XCONS (XCONS (XCONS (event)->cdr)->cdr)->car) | |
256 | ||
6765e5b0 JB |
257 | /* Extract the click count from a multi-click event. */ |
258 | #define EVENT_CLICK_COUNT(event) (Fnth ((event), make_number (2))) | |
259 | ||
53ce28d6 | 260 | /* Extract the fields of a position. */ |
ac501cd9 JB |
261 | #define POSN_WINDOW(posn) (XCONS (posn)->car) |
262 | #define POSN_BUFFER_POSN(posn) (XCONS (XCONS (posn)->cdr)->car) | |
ac501cd9 JB |
263 | #define POSN_WINDOW_POSN(posn) (XCONS (XCONS (XCONS (posn)->cdr)->cdr)->car) |
264 | #define POSN_TIMESTAMP(posn) \ | |
265 | (XCONS (XCONS (XCONS (XCONS (posn)->cdr)->cdr)->cdr)->car) | |
6765e5b0 | 266 | #define POSN_SCROLLBAR_PART(posn) (Fnth ((posn), make_number (4))) |
284f4730 JB |
267 | |
268 | /* Some of the event heads. */ | |
6084b314 | 269 | extern Lisp_Object Qswitch_frame; |
284f4730 JB |
270 | |
271 | /* Properties on event heads. */ | |
ac501cd9 | 272 | extern Lisp_Object Qevent_kind, Qevent_symbol_elements; |
284f4730 JB |
273 | |
274 | /* Getting an unmodified version of an event head. */ | |
275 | #define EVENT_HEAD_UNMODIFIED(event_head) \ | |
ac501cd9 | 276 | (Fcar (Fget ((event_head), Qevent_symbol_elements))) |
284f4730 JB |
277 | |
278 | /* The values of Qevent_kind properties. */ | |
279 | extern Lisp_Object Qfunction_key, Qmouse_click, Qmouse_movement; | |
fd2777e0 | 280 | extern Lisp_Object Qscroll_bar_movement; |
284f4730 JB |
281 | |
282 | /* Getting the kind of an event head. */ | |
283 | #define EVENT_HEAD_KIND(event_head) \ | |
284 | (Fget ((event_head), Qevent_kind)) | |
285 | ||
286 | /* Symbols to use for non-text mouse positions. */ | |
e5d77022 | 287 | extern Lisp_Object Qmode_line, Qvertical_line; |
284f4730 | 288 | |
d748a3db AS |
289 | /* Forward declaration for prototypes. */ |
290 | struct input_event; | |
291 | ||
292 | extern Lisp_Object get_keymap_1 P_ ((Lisp_Object, int, int)); | |
293 | EXFUN (Fkeymapp, 1); | |
294 | extern Lisp_Object reorder_modifiers P_ ((Lisp_Object)); | |
295 | extern Lisp_Object read_char P_ ((int, int, Lisp_Object *, Lisp_Object, int *)); | |
ec558adc JB |
296 | /* User-supplied string to translate input characters through. */ |
297 | extern Lisp_Object Vkeyboard_translate_table; | |
298 | ||
d748a3db AS |
299 | extern Lisp_Object map_prompt P_ ((Lisp_Object)); |
300 | ||
0340dc60 | 301 | |
ec5d8db7 | 302 | extern int parse_menu_item P_ ((Lisp_Object, int, int)); |
0340dc60 | 303 | |
d748a3db AS |
304 | extern void echo_now P_ ((void)); |
305 | extern void init_kboard P_ ((KBOARD *)); | |
306 | extern void delete_kboard P_ ((KBOARD *)); | |
307 | extern void single_kboard_state P_ ((void)); | |
308 | extern void push_frame_kboard P_ ((struct frame *)); | |
309 | extern void pop_frame_kboard P_ ((void)); | |
310 | extern void record_asynch_buffer_change P_ ((void)); | |
311 | extern void clear_waiting_for_input P_ ((void)); | |
312 | extern SIGTYPE input_poll_signal P_ ((int)); | |
313 | extern void start_polling P_ ((void)); | |
314 | extern void stop_polling P_ ((void)); | |
315 | extern void set_poll_suppress_count P_ ((int)); | |
316 | extern void gobble_input P_ ((int)); | |
317 | extern int input_polling_used P_ ((void)); | |
318 | extern void clear_input_pending P_ ((void)); | |
319 | extern int requeued_events_pending_p P_ ((void)); | |
320 | extern void bind_polling_period P_ ((int)); | |
321 | extern void stuff_buffered_input P_ ((Lisp_Object)); | |
322 | extern void clear_waiting_for_input P_ ((void)); | |
323 | extern void swallow_events P_ ((int)); | |
324 | extern int help_char_p P_ ((Lisp_Object)); | |
325 | extern void quit_throw_to_read_char P_ ((void)); | |
326 | extern void cmd_error_internal P_ ((Lisp_Object, char *)); | |
327 | extern void timer_start_idle P_ ((void)); | |
328 | extern void timer_stop_idle P_ ((void)); | |
329 | extern int lucid_event_type_list_p P_ ((Lisp_Object)); | |
330 | extern void kbd_buffer_store_event P_ ((struct input_event *)); |