Mercurial > hg > xemacs-beta
diff src/event-Xt.c @ 0:376386a54a3c r19-14
Import from CVS: tag r19-14
| author | cvs |
|---|---|
| date | Mon, 13 Aug 2007 08:45:50 +0200 |
| parents | |
| children | ac2d302a0011 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/src/event-Xt.c Mon Aug 13 08:45:50 2007 +0200 @@ -0,0 +1,2615 @@ +/* The event_stream interface for X11 with Xt, and/or tty frames. + Copyright (C) 1991, 1992, 1993, 1994, 1995 Free Software Foundation, Inc. + Copyright (C) 1995 Sun Microsystems, Inc. + Copyright (C) 1996 Ben Wing. + +This file is part of XEmacs. + +XEmacs is free software; you can redistribute it and/or modify it +under the terms of the GNU General Public License as published by the +Free Software Foundation; either version 2, or (at your option) any +later version. + +XEmacs 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 XEmacs; see the file COPYING. If not, write to +the Free Software Foundation, Inc., 59 Temple Place - Suite 330, +Boston, MA 02111-1307, USA. */ + +/* Synched up with: Not in FSF. */ + +#include <config.h> +#include "lisp.h" + +#include "console-x.h" +#include "lwlib.h" +#include "EmacsFrame.h" + +#include "blocktype.h" +#include "buffer.h" +#include "commands.h" +#include "console.h" +#include "console-tty.h" +#include "events.h" +#include "frame.h" +#include "objects-x.h" +#include "process.h" +#include "redisplay.h" + +#include "systime.h" +#include "sysproc.h" /* for MAXDESC */ + +#include "xintrinsicp.h" /* CoreP.h needs this */ +#include <X11/CoreP.h> /* Numerous places access the fields of + a core widget directly. We could + use XtVaGetValues(), but ... */ + +static struct event_stream *Xt_event_stream; + +/* With the new event model, all events go through XtDispatchEvent() + and are picked up by an event handler that is added to each frame + widget. (This is how it's supposed to be.) In the old method, + Emacs sucks out events directly from XtNextEvent() and only + dispatches the events that it doesn't need to deal with. This + old way has lots of corresponding junk that is no longer + necessary: lwlib extensions, synthetic XAnyEvents, unnecessary + magic events, etc. */ + +/* The one and only one application context that Emacs uses. */ +XtAppContext Xt_app_con; + +/* Do we accept events sent by other clients? */ +int x_allow_sendevents; + +int modifier_keys_are_sticky; + +#ifdef DEBUG_XEMACS +int x_debug_events; +#endif + +static int process_events_occurred; +static int tty_events_occurred; + +/* Mask of bits indicating the descriptors that we wait for input on */ +extern SELECT_TYPE input_wait_mask, process_only_mask, tty_only_mask; + +static CONST String x_fallback_resources[] = +{ + /* This file is automatically generated from the app-defaults file + in ../etc/Emacs.ad. These resources are consulted only if no + app-defaults file is found at all. + */ +#include "Emacs.ad.h" + 0 +}; + +void emacs_Xt_mapping_action (Widget w, XEvent *event); +void debug_process_finalization (struct Lisp_Process *p); +Lisp_Object dequeue_Xt_dispatch_event (void); +void emacs_Xt_event_handler (Widget wid, XtPointer closure, XEvent *event, + Boolean *continue_to_dispatch); + +#ifdef EPOCH +void dispatch_epoch_event (struct frame *f, XEvent *event, Lisp_Object type); +#endif + +static int last_quit_check_signal_tick_count; + +Lisp_Object Qkey_mapping; + + +/************************************************************************/ +/* keymap handling */ +/************************************************************************/ + +/* X bogusly doesn't define the interpretations of any bits besides + ModControl, ModShift, and ModLock; so the Interclient Communication + Conventions Manual says that we have to bend over backwards to figure + out what the other modifier bits mean. According to ICCCM: + + - Any keycode which is assigned ModControl is a "control" key. + + - Any modifier bit which is assigned to a keycode which generates Meta_L + or Meta_R is the modifier bit meaning "meta". Likewise for Super, Hyper, + etc. + + - Any keypress event which contains ModControl in its state should be + interpreted as a "control" character. + + - Any keypress event which contains a modifier bit in its state which is + generated by a keycode whose corresponding keysym is Meta_L or Meta_R + should be interpreted as a "meta" character. Likewise for Super, Hyper, + etc. + + - It is illegal for a keysym to be associated with more than one modifier + bit. + + This means that the only thing that emacs can reasonably interpret as a + "meta" key is a key whose keysym is Meta_L or Meta_R, and which generates + one of the modifier bits Mod1-Mod5. + + Unfortunately, many keyboards don't have Meta keys in their default + configuration. So, if there are no Meta keys, but there are "Alt" keys, + emacs will interpret Alt as Meta. If there are both Meta and Alt keys, + then the Meta keys mean "Meta", and the Alt keys mean "Alt" (it used to + mean "Symbol," but that just confused the hell out of way too many people). + + This works with the default configurations of the 19 keyboard-types I've + checked. + + Emacs detects keyboard configurations which violate the above rules, and + prints an error message on the standard-error-output. (Perhaps it should + use a pop-up-window instead.) + */ + +static void +x_reset_key_mapping (struct device *d) +{ + Display *display = DEVICE_X_DISPLAY (d); + struct x_device *xd = DEVICE_X_DATA (d); + int max_code; + if (xd->x_keysym_map) + XFree ((char *) xd->x_keysym_map); + XDisplayKeycodes (display, &xd->x_keysym_map_min_code, + &max_code); + xd->x_keysym_map = + XGetKeyboardMapping (display, xd->x_keysym_map_min_code, + max_code - xd->x_keysym_map_min_code + 1, + &xd->x_keysym_map_keysyms_per_code); +} + +static CONST char * +index_to_name (int indice) +{ + return ((indice == ShiftMapIndex ? "ModShift" + : (indice == LockMapIndex ? "ModLock" + : (indice == ControlMapIndex ? "ModControl" + : (indice == Mod1MapIndex ? "Mod1" + : (indice == Mod2MapIndex ? "Mod2" + : (indice == Mod3MapIndex ? "Mod3" + : (indice == Mod4MapIndex ? "Mod4" + : (indice == Mod5MapIndex ? "Mod5" + : "???"))))))))); +} + +/* Boy, I really wish C had local functions... */ +struct c_doesnt_have_closures /* #### not yet used */ +{ + int warned_about_overlapping_modifiers; + int warned_about_predefined_modifiers; + int warned_about_duplicate_modifiers; + int meta_bit; + int hyper_bit; + int super_bit; + int alt_bit; + int mode_bit; +}; + +static void +x_reset_modifier_mapping (struct device *d) +{ + Display *display = DEVICE_X_DISPLAY (d); + struct x_device *xd = DEVICE_X_DATA (d); + int modifier_index, modifier_key, column, mkpm; + int warned_about_overlapping_modifiers = 0; + int warned_about_predefined_modifiers = 0; + int warned_about_duplicate_modifiers = 0; + int meta_bit = 0; + int hyper_bit = 0; + int super_bit = 0; + int alt_bit = 0; + int mode_bit = 0; + + xd->lock_interpretation = 0; + + if (xd->x_modifier_keymap) + XFreeModifiermap (xd->x_modifier_keymap); + + x_reset_key_mapping (d); + + xd->x_modifier_keymap = XGetModifierMapping (display); + + /* Boy, I really wish C had local functions... + */ + + /* The call to warn_when_safe must be on the same line as the string or + make-msgfile won't pick it up properly (the newline doesn't confuse + it, but the backslash does). */ + +#define modwarn(name,old,other) \ + warn_when_safe (Qkey_mapping, Qwarning, "XEmacs: %s (0x%x) generates %s, which is generated by %s.", \ + name, code, index_to_name (old), other), \ + warned_about_overlapping_modifiers = 1 + +#define modbarf(name,other) \ + warn_when_safe (Qkey_mapping, Qwarning, "XEmacs: %s (0x%x) generates %s, which is nonsensical.", \ + name, code, other), \ + warned_about_predefined_modifiers = 1 + +#define check_modifier(name,mask) \ + if ((1<<modifier_index) != mask) \ + warn_when_safe (Qkey_mapping, Qwarning, "XEmacs: %s (0x%x) generates %s, which is nonsensical.", \ + name, code, index_to_name (modifier_index)), \ + warned_about_predefined_modifiers = 1 + +#define store_modifier(name,old) \ + if (old && old != modifier_index) \ + warn_when_safe (Qkey_mapping, Qwarning, "XEmacs: %s (0x%x) generates both %s and %s, which is nonsensical.",\ + name, code, index_to_name (old), \ + index_to_name (modifier_index)), \ + warned_about_duplicate_modifiers = 1; \ + if (modifier_index == ShiftMapIndex) modbarf (name,"ModShift"); \ + else if (modifier_index == LockMapIndex) modbarf (name,"ModLock"); \ + else if (modifier_index == ControlMapIndex) modbarf (name,"ModControl"); \ + else if (sym == XK_Mode_switch) \ + mode_bit = modifier_index; /* Mode_switch is special, see below... */ \ + else if (modifier_index == meta_bit && old != meta_bit) \ + modwarn (name, meta_bit, "Meta"); \ + else if (modifier_index == super_bit && old != super_bit) \ + modwarn (name, super_bit, "Super"); \ + else if (modifier_index == hyper_bit && old != hyper_bit) \ + modwarn (name, hyper_bit, "Hyper"); \ + else if (modifier_index == alt_bit && old != alt_bit) \ + modwarn (name, alt_bit, "Alt"); \ + else \ + old = modifier_index; + + mkpm = xd->x_modifier_keymap->max_keypermod; + for (modifier_index = 0; modifier_index < 8; modifier_index++) + for (modifier_key = 0; modifier_key < mkpm; modifier_key++) { + KeySym last_sym = 0; + for (column = 0; column < 4; column += 2) { + KeyCode code = xd->x_modifier_keymap->modifiermap[modifier_index * mkpm + + modifier_key]; + KeySym sym = (code ? XKeycodeToKeysym (display, code, column) : 0); + if (sym == last_sym) continue; + last_sym = sym; + switch (sym) { + case XK_Mode_switch:store_modifier ("Mode_switch", mode_bit); break; + case XK_Meta_L: store_modifier ("Meta_L", meta_bit); break; + case XK_Meta_R: store_modifier ("Meta_R", meta_bit); break; + case XK_Super_L: store_modifier ("Super_L", super_bit); break; + case XK_Super_R: store_modifier ("Super_R", super_bit); break; + case XK_Hyper_L: store_modifier ("Hyper_L", hyper_bit); break; + case XK_Hyper_R: store_modifier ("Hyper_R", hyper_bit); break; + case XK_Alt_L: store_modifier ("Alt_L", alt_bit); break; + case XK_Alt_R: store_modifier ("Alt_R", alt_bit); break; + case XK_Control_L: check_modifier ("Control_L", ControlMask); break; + case XK_Control_R: check_modifier ("Control_R", ControlMask); break; + case XK_Shift_L: check_modifier ("Shift_L", ShiftMask); break; + case XK_Shift_R: check_modifier ("Shift_R", ShiftMask); break; + case XK_Shift_Lock: check_modifier ("Shift_Lock", LockMask); + xd->lock_interpretation = XK_Shift_Lock; break; + case XK_Caps_Lock: check_modifier ("Caps_Lock", LockMask); + xd->lock_interpretation = XK_Caps_Lock; break; + + /* It probably doesn't make any sense for a modifier bit to be + assigned to a key that is not one of the above, but OpenWindows + assigns modifier bits to a couple of random function keys for + no reason that I can discern, so printing a warning here would + be annoying. + */ + } + } + } +#undef store_modifier +#undef check_modifier +#undef modwarn +#undef modbarf + + /* If there was no Meta key, then try using the Alt key instead. + If there is both a Meta key and an Alt key, then the Alt key + is not disturbed and remains an Alt key. + */ + if (! meta_bit && alt_bit) + meta_bit = alt_bit, alt_bit = 0; + + /* mode_bit overrides everything, since it's processed down inside of + XLookupString() instead of by us. If Meta and Mode_switch both + generate the same modifier bit (which is an error), then we don't + interpret that bit as Meta, because we can't make XLookupString() + not interpret it as Mode_switch; and interpreting it as both would + be totally wrong. + */ + if (mode_bit) + { + CONST char *warn = 0; + if (mode_bit == meta_bit) warn = "Meta", meta_bit = 0; + else if (mode_bit == hyper_bit) warn = "Hyper", hyper_bit = 0; + else if (mode_bit == super_bit) warn = "Super", super_bit = 0; + else if (mode_bit == alt_bit) warn = "Alt", alt_bit = 0; + if (warn) + { + warn_when_safe + (Qkey_mapping, Qwarning, + "XEmacs: %s is being used for both Mode_switch and %s.", + index_to_name (mode_bit), warn), + warned_about_overlapping_modifiers = 1; + } + } +#undef index_to_name + + xd->MetaMask = (meta_bit ? (1 << meta_bit) : 0); + xd->HyperMask = (hyper_bit ? (1 << hyper_bit) : 0); + xd->SuperMask = (super_bit ? (1 << super_bit) : 0); + xd->AltMask = (alt_bit ? (1 << alt_bit) : 0); + xd->ModeMask = (mode_bit ? (1 << mode_bit) : 0); /* unused */ + + + if (warned_about_overlapping_modifiers) + warn_when_safe (Qkey_mapping, Qwarning, "\n" +" Two distinct modifier keys (such as Meta and Hyper) cannot generate\n" +" the same modifier bit, because Emacs won't be able to tell which\n" +" modifier was actually held down when some other key is pressed. It\n" +" won't be able to tell Meta-x and Hyper-x apart, for example. Change\n" +" one of these keys to use some other modifier bit. If you intend for\n" +" these keys to have the same behavior, then change them to have the\n" +" same keysym as well as the same modifier bit."); + + if (warned_about_predefined_modifiers) + warn_when_safe (Qkey_mapping, Qwarning, "\n" +" The semantics of the modifier bits ModShift, ModLock, and ModControl\n" +" are predefined. It does not make sense to assign ModControl to any\n" +" keysym other than Control_L or Control_R, or to assign any modifier\n" +" bits to the \"control\" keysyms other than ModControl. You can't\n" +" turn a \"control\" key into a \"meta\" key (or vice versa) by simply\n" +" assigning the key a different modifier bit. You must also make that\n" +" key generate an appropriate keysym (Control_L, Meta_L, etc)."); + + /* Don\'t need to say anything more for warned_about_duplicate_modifiers. */ + + if (warned_about_overlapping_modifiers || warned_about_predefined_modifiers) + warn_when_safe (Qkey_mapping, Qwarning, "\n" +" The meanings of the modifier bits Mod1 through Mod5 are determined\n" +" by the keysyms used to control those bits. Mod1 does NOT always\n" +" mean Meta, although some non-ICCCM-compliant programs assume that."); +} + +void +x_init_modifier_mapping (struct device *d) +{ + DEVICE_X_DATA (d)->x_keysym_map = 0; + DEVICE_X_DATA (d)->x_modifier_keymap = 0; + x_reset_modifier_mapping (d); +} + +static int +x_key_is_modifier_p (KeyCode keycode, struct device *d) +{ + struct x_device *xd = DEVICE_X_DATA (d); + KeySym *syms = &xd->x_keysym_map [(keycode - xd->x_keysym_map_min_code) * + xd->x_keysym_map_keysyms_per_code]; + int i; + for (i = 0; i < xd->x_keysym_map_keysyms_per_code; i++) + if (IsModifierKey (syms [i]) || + syms [i] == XK_Mode_switch) /* why doesn't IsModifierKey count this? */ + return 1; + return 0; +} + +/* key-handling code is always ugly. It just ends up working out + that way. + + Here are some pointers: + + -- DOWN_MASK indicates which modifiers should be treated as "down" + when the corresponding upstroke happens. It gets reset for + a particular modifier when that modifier goes up, and reset + for all modifiers when a non-modifier key is pressed. Example: + + I press Control-A-Shift and then release Control-A-Shift. + I want the Shift key to be sticky but not the Control key. + + -- LAST_DOWNKEY and RELEASE_TIME are used to keep track of + auto-repeat -- see below. + + -- If a modifier key is sticky, I can unstick it by pressing + the modifier key again. */ + +static void +x_handle_sticky_modifiers (XEvent *ev, struct device *d) +{ + struct x_device *xd = DEVICE_X_DATA (d); + KeyCode keycode = ev->xkey.keycode; + int type = ev->xany.type; + int is_modifier = + (type == KeyPress || type == KeyRelease) && + x_key_is_modifier_p (keycode, d); + + if (!modifier_keys_are_sticky) + return; + + if (!is_modifier) + { + if (type == KeyPress && !xd->last_downkey) + xd->last_downkey = keycode; + else if (type == ButtonPress || + (type == KeyPress && xd->last_downkey && + (keycode != xd->last_downkey || + ev->xkey.time != xd->release_time))) + { + xd->need_to_add_mask = 0; + xd->last_downkey = 0; + } + if (type == KeyPress) + xd->release_time = 0; + if (type == KeyPress || type == ButtonPress) + xd->down_mask = 0; + + ev->xkey.state |= xd->need_to_add_mask; + + if (type == KeyRelease && keycode == xd->last_downkey) + /* If I hold press-and-release the Control key and then press + and hold down the right arrow, I want it to auto-repeat + Control-Right. On the other hand, if I do the same but + manually press the Right arrow a bunch of times, I want + to see one Control-Right and then a bunch of Rights. + This means that we need to distinguish between an + auto-repeated key and a key pressed and released a bunch + of times. + + Naturally, the designers of the X spec didn't see fit + to provide an obvious way to distinguish these cases. + So we assume that if the release and the next press + occur at the same time, the key was actually auto- + repeated. Under Open-Windows, at least, this works. + */ + xd->release_time = ev->xkey.time; + } + else + { + KeySym *syms = &xd->x_keysym_map [(keycode - xd->x_keysym_map_min_code) * + xd->x_keysym_map_keysyms_per_code]; + int i; + +#define FROB(mask) \ +do { \ + if (type == KeyPress) \ + { \ + /* If modifier key is already sticky, \ + then unstick it. Note that we do \ + not test down_mask to deal with the \ + unlikely but possible case that the \ + modifier key auto-repeats. */ \ + if (xd->need_to_add_mask & mask) \ + { \ + xd->need_to_add_mask &= ~mask; \ + xd->down_mask &= ~mask; \ + } \ + else \ + xd->down_mask |= mask; \ + } \ + else \ + { \ + if (xd->down_mask & mask) \ + { \ + xd->down_mask &= ~mask; \ + xd->need_to_add_mask |= mask; \ + } \ + } \ +} while (0) + + /* If a non-modifier key was pressed in the middle of a bunch + of modifiers, then it unsticks all the modifiers that were + previously pressed. We cannot unstick the modifiers until + now because we want to check for auto-repeat of the + non-modifier key. */ + + if (xd->last_downkey) + { + xd->last_downkey = 0; + xd->need_to_add_mask = 0; + } + + for (i = 0; i < xd->x_keysym_map_keysyms_per_code; i++) + { + if (syms[i] == XK_Control_L || syms[i] == XK_Control_R) + FROB (ControlMask); + if (syms[i] == XK_Shift_L || syms[i] == XK_Shift_R) + FROB (ShiftMask); + if (syms[i] == XK_Meta_L || syms[i] == XK_Meta_R) + FROB (xd->MetaMask); + if (syms[i] == XK_Super_L || syms[i] == XK_Super_R) + FROB (xd->SuperMask); + if (syms[i] == XK_Hyper_L || syms[i] == XK_Hyper_R) + FROB (xd->HyperMask); + if (syms[i] == XK_Alt_L || syms[i] == XK_Alt_R) + FROB (xd->AltMask); + } + } +#undef FROB +} + +static void +clear_sticky_modifiers (struct device *d) +{ + struct x_device *xd = DEVICE_X_DATA (d); + + xd->need_to_add_mask = 0; + xd->last_downkey = 0; + xd->release_time = 0; + xd->down_mask = 0; +} + +static int +keysym_obeys_caps_lock_p (KeySym sym, struct device *d) +{ + struct x_device *xd = DEVICE_X_DATA (d); + /* Eeeeevil hack. Don't apply caps-lock to things that aren't alphabetic + characters, where "alphabetic" means something more than simply A-Z. + That is, if caps-lock is down, typing ESC doesn't produce Shift-ESC. + But if shift-lock is down, then it does. + */ + if (xd->lock_interpretation == XK_Shift_Lock) + return 1; + if (((sym >= XK_A) && (sym <= XK_Z)) || + ((sym >= XK_a) && (sym <= XK_z)) || + ((sym >= XK_Agrave) && (sym <= XK_Odiaeresis)) || + ((sym >= XK_agrave) && (sym <= XK_odiaeresis)) || + ((sym >= XK_Ooblique) && (sym <= XK_Thorn)) || + ((sym >= XK_oslash) && (sym <= XK_thorn))) + return 1; + else + return 0; +} + +/* called from EmacsFrame.c (actually from Xt itself) when a + MappingNotify event is received. For non-obvious reasons, + our event handler does not see these events, so we need a + special translation. */ +void +emacs_Xt_mapping_action (Widget w, XEvent* event) +{ + struct device *d = get_device_from_display (event->xany.display); +#if 0 + /* nyet. Now this is handled by Xt. */ + XRefreshKeyboardMapping (&event->xmapping); +#endif + /* xmodmap generates about a billion MappingKeyboard events, followed + by a single MappingModifier event, so it might be worthwhile to + take extra MappingKeyboard events out of the queue before requesting + the current keymap from the server. + */ + if (event->xmapping.request == MappingKeyboard) + x_reset_key_mapping (d); + else if (event->xmapping.request == MappingModifier) + x_reset_modifier_mapping (d); +} + + +/************************************************************************/ +/* X to Emacs event conversion */ +/************************************************************************/ + +#if (defined(sun) || defined(__sun)) && defined(__GNUC__) +# define SUNOS_GCC_L0_BUG +#endif + +#ifdef SUNOS_GCC_L0_BUG +static void +x_to_emacs_keysym_sunos_bug (Lisp_Object *return_value_sunos_bug, /* #### */ + XEvent *event, int simple_p) +#else /* !SUNOS_GCC_L0_BUG */ +static Lisp_Object +x_to_emacs_keysym (XEvent *event, int simple_p) +#endif /* !SUNOS_GCC_L0_BUG */ + /* simple_p means don't try too hard (ASCII only) */ +{ + char *name; + KeySym keysym = 0; + struct device *d = get_device_from_display (event->xany.display); + /* Apparently it's necessary to specify a dummy here (rather than + passing in 0) to avoid crashes on German IRIX */ + char dummy[256]; + +#ifdef SUNOS_GCC_L0_BUG +# define return(lose) \ + do {*return_value_sunos_bug = (lose); goto return_it; } while (0) +#endif + + /* ### FIX this by replacing with calls to XmbLookupString. + XLookupString should never be called. --mrb */ + XLookupString (&event->xkey, dummy, 200, &keysym, 0); + + /* &DEVICE_X_X_COMPOSE_STATUS (d)); */ + + if (keysym >= XK_exclam && keysym <= XK_asciitilde) + /* We must assume that the X keysym numbers for the ASCII graphic + characters are the same as their ASCII codes. */ + return (make_char (keysym)); + + switch (keysym) + { + /* These would be handled correctly by the default case, but by + special-casing them here we don't garbage a string or call intern(). + */ + case XK_BackSpace: return (QKbackspace); + case XK_Tab: return (QKtab); + case XK_Linefeed: return (QKlinefeed); + case XK_Return: return (QKreturn); + case XK_Escape: return (QKescape); + case XK_space: return (QKspace); + case XK_Delete: return (QKdelete); + case 0: return (Qnil); + /* This kludge prevents bogus Xlib compose conversions. + Don't ask why. The following case must be removed when we + switch to using XmbLookupString */ + case XK_Multi_key: XLookupString (&event->xkey, dummy, 200, &keysym, 0); + /* Fallthrough!! */ + default: + if (simple_p) return (Qnil); + /* #### without return_value_sunos_bug, %l0 (GCC struct return pointer) + * #### gets roached (top 8 bits cleared) around this call. + */ + /* !!#### not Mule-ized */ + name = XKeysymToString (keysym); + if (!name || !name[0]) /* this shouldn't happen... */ + { + char buf [255]; + sprintf (buf, "unknown_keysym_0x%X", (int) keysym); + return (KEYSYM (buf)); + } + /* If it's got a one-character name, that's good enough. */ + if (!name[1]) return (make_char (name[0])); + + /* If it's in the "Keyboard" character set, downcase it. + The case of those keysyms is too totally random for us to + force anyone to remember them. + The case of the other character sets is significant, however. + */ + if ((((unsigned int) keysym) & (~0xFF)) == ((unsigned int) 0xFF00)) + { + char buf [255]; + char *s1, *s2; + for (s1 = name, s2 = buf; *s1; s1++, s2++) + *s2 = tolower (* (unsigned char *) s1); + *s2 = 0; + return (KEYSYM (buf)); + } + return (KEYSYM (name)); + } +#ifdef SUNOS_GCC_L0_BUG +# undef return + return_it: + return; +#endif +} + +#ifdef SUNOS_GCC_L0_BUG +/* #### */ +static Lisp_Object +x_to_emacs_keysym (XEvent *event, int simple_p) +{ + Lisp_Object return_value_sunos_bug; + x_to_emacs_keysym_sunos_bug (&return_value_sunos_bug, event, simple_p); + return (return_value_sunos_bug); +} +#endif + +static void +set_last_server_timestamp (struct device *d, XEvent *x_event) +{ + switch (x_event->xany.type) + { + case KeyPress: + case KeyRelease: + DEVICE_X_LAST_SERVER_TIMESTAMP (d) = x_event->xkey.time; + break; + + case ButtonPress: + case ButtonRelease: + DEVICE_X_LAST_SERVER_TIMESTAMP (d) = x_event->xbutton.time; + break; + + case MotionNotify: + DEVICE_X_LAST_SERVER_TIMESTAMP (d) = x_event->xmotion.time; + break; + + case EnterNotify: + case LeaveNotify: + DEVICE_X_LAST_SERVER_TIMESTAMP (d) = x_event->xcrossing.time; + break; + + case PropertyNotify: + DEVICE_X_LAST_SERVER_TIMESTAMP (d) = x_event->xproperty.time; + break; + + case SelectionClear: + DEVICE_X_LAST_SERVER_TIMESTAMP (d) = x_event->xselectionclear.time; + break; + + case SelectionRequest: + DEVICE_X_LAST_SERVER_TIMESTAMP (d) = x_event->xselectionrequest.time; + break; + + case SelectionNotify: + DEVICE_X_LAST_SERVER_TIMESTAMP (d) = x_event->xselection.time; + break; + } +} + +static int +x_event_to_emacs_event (XEvent *x_event, struct Lisp_Event *emacs_event) +{ + Display *display = x_event->xany.display; + struct device *d = get_device_from_display (display); + struct x_device *xd = DEVICE_X_DATA (d); + + set_last_server_timestamp (d, x_event); + + switch (x_event->xany.type) + { + case KeyRelease: + x_handle_sticky_modifiers (x_event, d); + return 0; + + case KeyPress: + case ButtonPress: + case ButtonRelease: + { + unsigned int modifiers = 0; + int shift_p; + int lock_p; +#ifdef EXTERNAL_WIDGET + struct frame *f = x_any_window_to_frame (d, x_event->xany.window); +#endif + + /* If this is a synthetic KeyPress or Button event, and the user + has expressed a disinterest in this security hole, then drop + it on the floor. + */ + if (((x_event->xany.type == KeyPress) + ? x_event->xkey.send_event + : x_event->xbutton.send_event) +#ifdef EXTERNAL_WIDGET + /* ben: events get sent to an ExternalShell using XSendEvent. + This is not a perfect solution. */ + && !FRAME_X_EXTERNAL_WINDOW_P (f) +#endif + && !x_allow_sendevents) + return 0; + + x_handle_sticky_modifiers (x_event, d); + + shift_p = x_event->xkey.state & ShiftMask; + lock_p = x_event->xkey.state & LockMask; + + if (x_event->xany.type == KeyPress) + DEVICE_X_GLOBAL_MOUSE_TIMESTAMP (d) = x_event->xkey.time; + else + DEVICE_X_GLOBAL_MOUSE_TIMESTAMP (d) = x_event->xbutton.time; + + /* Ignore the caps-lock key w.r.t. mouse presses and releases. */ + if (x_event->xany.type != KeyPress) + lock_p = 0; + + if (x_event->xkey.state & ControlMask) modifiers |= MOD_CONTROL; + if (x_event->xkey.state & xd->MetaMask) modifiers |= MOD_META; + if (x_event->xkey.state & xd->SuperMask) modifiers |= MOD_SUPER; + if (x_event->xkey.state & xd->HyperMask) modifiers |= MOD_HYPER; + if (x_event->xkey.state & xd->AltMask) modifiers |= MOD_ALT; + + /* Ignore the caps-lock key if any other modifiers are down; this is + so that Caps doesn't turn C-x into C-X, which would suck. */ + if (modifiers) + { + x_event->xkey.state &= (~LockMask); + lock_p = 0; + } + + if (shift_p || lock_p) + modifiers |= MOD_SHIFT; + + DEVICE_X_MOUSE_TIMESTAMP (d) = DEVICE_X_GLOBAL_MOUSE_TIMESTAMP (d); + + switch (x_event->xany.type) + { + case KeyPress: + { + Lisp_Object keysym; + KeyCode keycode = x_event->xkey.keycode; + + if (x_key_is_modifier_p (keycode, d)) /* it's a modifier key */ + return 0; + + /* This used to compute the frame from the given X window + and store it here, but we really don't care about the + frame. */ + emacs_event->channel = DEVICE_CONSOLE (d); + keysym = x_to_emacs_keysym (x_event, 0); + + /* If the emacs keysym is nil, then that means that the + X keysym was NoSymbol, which probably means that + we're in the midst of reading a Multi_key sequence, + or a "dead" key prefix. Ignore it. */ + if (NILP (keysym)) + return 0; + + /* More caps-lock garbage: caps-lock should *only* add + the shift modifier to two-case keys (that is, A-Z and + related characters). So at this point (after looking + up the keysym) if the keysym isn't a dual-case + alphabetic, and if the caps lock key was down but the + shift key wasn't, then turn off the shift modifier. + Gag barf retch. */ + /* #### type lossage: assuming equivalence of emacs and + X keysyms */ + /* !!#### maybe fix for Mule */ + if (! (CHAR_OR_CHAR_INTP (keysym) + && keysym_obeys_caps_lock_p + ((KeySym) XCHAR_OR_CHAR_INT (keysym), d)) + && lock_p + && !shift_p) + modifiers &= (~MOD_SHIFT); + + /* If this key contains two distinct keysyms, that is, + "shift" generates a different keysym than the + non-shifted key, then don't apply the shift modifier + bit: it's implicit. Otherwise, if there would be no + other way to tell the difference between the shifted + and unshifted version of this key, apply the shift + bit. Non-graphics, like Backspace and F1 get the + shift bit in the modifiers slot. Neither the + characters "a", "A", "2", nor "@" normally have the + shift bit set. However, "F1" normally does. */ + if (modifiers & MOD_SHIFT) + { + KeySym top, bot; + if (x_event->xkey.state & xd->ModeMask) + bot = XLookupKeysym (&x_event->xkey, 2), + top = XLookupKeysym (&x_event->xkey, 3); + else + bot = XLookupKeysym (&x_event->xkey, 0), + top = XLookupKeysym (&x_event->xkey, 1); + if (top && bot && top != bot) + modifiers &= ~MOD_SHIFT; + } + emacs_event->event_type = key_press_event; + emacs_event->timestamp = x_event->xkey.time; + emacs_event->event.key.modifiers = modifiers; + emacs_event->event.key.keysym = keysym; + break; + } + case ButtonPress: + case ButtonRelease: + { + struct frame *frame = + x_window_to_frame (d, x_event->xbutton.window); + if (! frame) + return 0; /* not for us */ + XSETFRAME (emacs_event->channel, frame); + } + + if (x_event->type == ButtonPress) + emacs_event->event_type = button_press_event; + else emacs_event->event_type = button_release_event; + emacs_event->timestamp = x_event->xbutton.time; + emacs_event->event.button.modifiers = modifiers; + emacs_event->event.button.button = x_event->xbutton.button; + emacs_event->event.button.x = x_event->xbutton.x; + emacs_event->event.button.y = x_event->xbutton.y; + break; + } + } + break; + + case MotionNotify: + { + Window w = x_event->xmotion.window; + struct frame *frame = x_window_to_frame (d, w); + XEvent event2; + + if (! frame) + return 0; /* not for us */ + + /* We use MotionHintMask, so we will get only one motion event + until the next time we call XQueryPointer or the user clicks + the mouse. So call XQueryPointer now (meaning that the event + will be in sync with the server just before Fnext_event() + returns). If the mouse is still in motion, then the server + will immediately generate exactly one more motion event, which + will be on the queue waiting for us next time around. + */ + event2 = *x_event; + if (XQueryPointer (x_event->xmotion.display, event2.xmotion.window, + &event2.xmotion.root, &event2.xmotion.subwindow, + &event2.xmotion.x_root, &event2.xmotion.y_root, + &event2.xmotion.x, &event2.xmotion.y, + &event2.xmotion.state)) + *x_event = event2; + + DEVICE_X_MOUSE_TIMESTAMP (d) = x_event->xmotion.time; + + XSETFRAME (emacs_event->channel, frame); + emacs_event->event_type = pointer_motion_event; + emacs_event->timestamp = x_event->xmotion.time; + emacs_event->event.motion.x = x_event->xmotion.x; + emacs_event->event.motion.y = x_event->xmotion.y; + { + unsigned int modifiers = 0; + if (x_event->xmotion.state & ShiftMask) modifiers |= MOD_SHIFT; + if (x_event->xmotion.state & ControlMask) modifiers |= MOD_CONTROL; + if (x_event->xmotion.state & xd->MetaMask) modifiers |= MOD_META; + if (x_event->xmotion.state & xd->SuperMask) modifiers |= MOD_SUPER; + if (x_event->xmotion.state & xd->HyperMask) modifiers |= MOD_HYPER; + if (x_event->xmotion.state & xd->AltMask) modifiers |= MOD_ALT; + /* Currently ignores Shift_Lock but probably shouldn't + (but it definitely should ignore Caps_Lock). */ + emacs_event->event.motion.modifiers = modifiers; + } + } + break; + + case ClientMessage: + /* Patch bogus TAKE_FOCUS messages from MWM; CurrentTime is passed as the + timestamp of the TAKE_FOCUS, which the ICCCM explicitly prohibits. */ + if (x_event->xclient.message_type == DEVICE_XATOM_WM_PROTOCOLS (d) + && x_event->xclient.data.l[0] == DEVICE_XATOM_WM_TAKE_FOCUS (d) + && x_event->xclient.data.l[1] == 0) + { + x_event->xclient.data.l[1] = DEVICE_X_LAST_SERVER_TIMESTAMP (d); + } + /* fall through */ + + default: /* it's a magic event */ + { + struct frame *f; + + switch (x_event->type) + { + /* Note: the number of cases could be reduced to two or + three by using xany.window, but it's perhaps clearer + and potentially more robust this way */ + case SelectionRequest: + f = x_window_to_frame (d, x_event->xselectionrequest.owner); + break; + + case SelectionClear: + f = x_window_to_frame (d, x_event->xselectionclear.window); + break; + + case SelectionNotify: + f = x_window_to_frame (d, x_event->xselection.requestor); + break; + + case PropertyNotify: + f = x_window_to_frame (d, x_event->xproperty.window); + break; + + case Expose: + case GraphicsExpose: + f = x_window_to_frame (d, x_event->xexpose.window); + break; + + case MapNotify: + case UnmapNotify: + f = x_any_window_to_frame (d, x_event->xmap.window); + break; + + case EnterNotify: + case LeaveNotify: + f = x_any_window_to_frame (d, x_event->xcrossing.window); + break; + + case FocusIn: + case FocusOut: + /* It's curious that we're using x_any_window_to_frame() + here. I don't know if this causes problems. */ + f = x_any_window_to_frame (d, x_event->xfocus.window); + + case ClientMessage: + f = x_any_window_to_frame (d, x_event->xclient.window); + break; + + case MappingNotify: + case VisibilityNotify: + f = x_any_window_to_frame (d, x_event->xvisibility.window); + break; + + case ConfigureNotify: + f = x_any_window_to_frame (d, x_event->xconfigure.window); + break; + + default: + f = x_any_window_to_frame (d, x_event->xany.window); + break; + } + + if (!f) + return 0; + + emacs_event->event_type = magic_event; + XSETFRAME (emacs_event->channel, f); + memcpy ((char *) &emacs_event->event.magic.underlying_x_event, + (char *) x_event, + sizeof (XEvent)); + break; + } + } + return 1; +} + + +/************************************************************************/ +/* magic-event handling */ +/************************************************************************/ + +static void +handle_focus_event_1 (struct frame *f, int in_p) +{ + /* On focus change, clear all memory of sticky modifiers + to avoid non-intuitive behavior. */ + clear_sticky_modifiers (XDEVICE (FRAME_DEVICE (f))); + + /* We don't want to handle the focus change now, because we might + be in an accept-process-output, sleep-for, or sit-for. So + we enqueue it. + + Actually, we half handle it: we handle it as far as changing the + box cursor for redisplay, but we don't call any hooks or do any + select-frame stuff until after the sit-for. + */ + { + Lisp_Object frm; + Lisp_Object conser; + struct gcpro gcpro1; + + XSETFRAME (frm, f); + conser = Fcons (frm, Fcons (FRAME_DEVICE (f), in_p ? Qt : Qnil)); + GCPRO1 (conser); + emacs_handle_focus_change_preliminary (conser); + enqueue_magic_eval_event (emacs_handle_focus_change_final, + conser); + UNGCPRO; + } +} + +/* This is called from the external-widget code */ + +void emacs_Xt_handle_focus_event (XEvent *event); +void +emacs_Xt_handle_focus_event (XEvent *event) +{ + /* + * It's curious that we're using x_any_window_to_frame() instead + * of x_window_to_frame(). I don't know what the impact of this is. + */ + + struct frame *f = + x_any_window_to_frame (get_device_from_display (event->xany.display), + event->xfocus.window); + if (!f) + /* focus events are sometimes generated just before + a frame is destroyed. */ + return; + handle_focus_event_1 (f, event->xany.type == FocusIn); +} + +static void +handle_map_event (struct frame *f, XEvent *event) +{ + Lisp_Object frame = Qnil; + + XSETFRAME (frame, f); + if (event->xany.type == MapNotify) + { + XWindowAttributes xwa; + + /* Bleagh!!!!!! Apparently some window managers (e.g. MWM) + send synthetic MapNotify events when a window is first + created, EVENT IF IT'S CREATED ICONIFIED OR INVISIBLE. + Or something like that. We initially tried a different + solution below, but that ran into a different window- + manager bug. + + It seems that the only reliable way is to treat a + MapNotify event as a "hint" that the window might or + might not be visible, and check explicitly. */ + + XGetWindowAttributes (event->xany.display, event->xmap.window, + &xwa); + if (xwa.map_state != IsViewable) + { + /* Calling Fframe_iconified_p is the only way we have to + correctly update FRAME_ICONIFIED_P */ + Fframe_iconified_p (frame); + return; + } + + FRAME_X_TOTALLY_VISIBLE_P (f) = 1; +#if 0 + /* Bleagh again!!!! We initially tried the following hack + around the MWM problem, but it turns out that TWM + has a race condition when you un-iconify, where it maps + the window and then tells the server that the window + is un-iconified. Usually, XEmacs wakes up between + those two occurrences, and thus thinks that un-iconified + windows are still iconified. + + Ah, the joys of X. */ + + /* By Emacs definition, a frame that is iconified is not + visible. Marking a frame as visible will automatically cause + frame-iconified-p to return nil, regardless of whether the + frame is actually iconified. Therefore, we have to ignore + MapNotify events on iconified frames. (It's not obvious + to me why these are being sent, but it happens at startup + with frames that are initially iconified; perhaps they are + synthetic MapNotify events coming from the window manager.) + Note that `frame-iconified-p' queries the server + to determine whether the frame is currently iconified, + rather than consulting some internal (and likely + inaccurate) state flag. Therefore, ignoring the MapNotify + is correct. */ + if (!f->visible && NILP (Fframe_iconified_p (frame))) +#endif + if (!f->visible) + { + f->visible = 1; + /* This improves the double flicker when uniconifying a frame + some. A lot of it is not showing a buffer which has changed + while the frame was iconified. To fix it further requires + the good 'ol double redisplay structure. */ + MARK_FRAME_WINDOWS_STRUCTURE_CHANGED (f); + va_run_hook_with_args (Qmap_frame_hook, 1, frame); +#ifdef EPOCH + dispatch_epoch_event (f, event, Qx_map); +#endif + } + } + else + { + FRAME_X_TOTALLY_VISIBLE_P (f) = 0; + if (f->visible) + { + f->visible = 0; + va_run_hook_with_args (Qunmap_frame_hook, 1, frame); +#ifdef EPOCH + dispatch_epoch_event (f, event, Qx_unmap); +#endif + } + + /* Calling Fframe_iconified_p is the only way we have to + correctly update FRAME_ICONIFIED_P */ + Fframe_iconified_p (frame); + } +} + +static void +handle_client_message (struct frame *f, XEvent *event) +{ + struct device *d = XDEVICE (FRAME_DEVICE (f)); + Lisp_Object frame = Qnil; + + XSETFRAME (frame, f); + + if (event->xclient.message_type == DEVICE_XATOM_WM_PROTOCOLS (d) && + event->xclient.data.l[0] == DEVICE_XATOM_WM_DELETE_WINDOW (d)) + { + /* WM_DELETE_WINDOW is a misc-user event, but other ClientMessages, + such as WM_TAKE_FOCUS, are eval events. That's because delete-window + was probably executed with a mouse click, while the others could + have been sent as a result of mouse motion or some other implicit + action. (Call this a "heuristic"...) The reason for caring about + this is so that clicking on the close-box will make emacs prompt + using a dialog box instead of the minibuffer if there are unsaved + buffers. + */ + enqueue_misc_user_event (frame, Qeval, + list3 (Qdelete_frame, frame, Qt)); + } + else if (event->xclient.message_type == DEVICE_XATOM_WM_PROTOCOLS (d) && + event->xclient.data.l[0] == DEVICE_XATOM_WM_TAKE_FOCUS (d)) + { + handle_focus_event_1 (f, 1); +#if 0 + /* If there is a dialog box up, focus on it. + + #### Actually, we're raising it too, which is wrong. We should + #### just focus on it, but lwlib doesn't currently give us an + #### easy way to do that. This should be fixed. + */ + unsigned long take_focus_timestamp = event->xclient.data.l[1]; + Widget widget = lw_raise_all_pop_up_widgets (); + if (widget) + { + /* kludge: raise_all returns bottommost widget, but we really + want the topmost. So just raise it for now. */ + XMapRaised (XtDisplay (widget), XtWindow (widget)); + /* Grab the focus with the timestamp of the TAKE_FOCUS. */ + XSetInputFocus (XtDisplay (widget), XtWindow (widget), + RevertToParent, take_focus_timestamp); + } +#endif + } +#ifdef EPOCH + dispatch_epoch_event (f, event, Qx_client_message); +#endif +} + +static void +emacs_Xt_handle_magic_event (struct Lisp_Event *emacs_event) +{ + /* This function can GC */ + XEvent *event = (XEvent *) &emacs_event->event.magic.underlying_x_event; + struct frame *f = XFRAME (EVENT_CHANNEL (emacs_event)); + + if (!FRAME_LIVE_P (f)) + return; + + switch (event->type) + { + case SelectionRequest: + x_handle_selection_request (&event->xselectionrequest); + break; + + case SelectionClear: + x_handle_selection_clear (&event->xselectionclear); + break; + + case SelectionNotify: + x_handle_selection_notify (&event->xselection); + break; + + case PropertyNotify: + x_handle_property_notify (&event->xproperty); +#ifdef EPOCH + dispatch_epoch_event (f, event, Qx_property_change); +#endif + break; + + case Expose: + x_redraw_exposed_area (f, event->xexpose.x, event->xexpose.y, + event->xexpose.width, event->xexpose.height); + break; + + case GraphicsExpose: /* This occurs when an XCopyArea's source area was + obscured or not available. */ + x_redraw_exposed_area (f, event->xexpose.x, event->xexpose.y, + event->xexpose.width, event->xexpose.height); + break; + + case MapNotify: + case UnmapNotify: + handle_map_event (f, event); + break; + + case EnterNotify: + if (event->xcrossing.detail != NotifyInferior) + { + Lisp_Object frame; + + XSETFRAME (frame, f); + /* FRAME_X_MOUSE_P (f) = 1; */ + va_run_hook_with_args (Qmouse_enter_frame_hook, 1, frame); + } + break; + + case LeaveNotify: + if (event->xcrossing.detail != NotifyInferior) + { + Lisp_Object frame; + + XSETFRAME (frame, f); + /* FRAME_X_MOUSE_P (f) = 0; */ + va_run_hook_with_args (Qmouse_leave_frame_hook, 1, frame); + } + break; + + case FocusIn: + case FocusOut: +#ifdef EXTERNAL_WIDGET + /* External widget lossage: Ben said: + YUCK. The only way to make focus changes work properly is to + completely ignore all FocusIn/FocusOut events and depend only + on notifications from the ExternalClient widget. */ + if (FRAME_X_EXTERNAL_WINDOW_P (f)) + break; +#endif + handle_focus_event_1 (f, event->xany.type == FocusIn); + break; + + case ClientMessage: + handle_client_message (f, event); + break; + +#if 0 + /* this is where we ought to be handling this event, but + we don't see it here. --ben */ + case MappingNotify: /* The user has run xmodmap */ +#endif + + case VisibilityNotify: /* window visiblity has changed */ + if (event->xvisibility.state == VisibilityUnobscured) + FRAME_X_TOTALLY_VISIBLE_P (f) = 1; + else + FRAME_X_TOTALLY_VISIBLE_P (f) = 0; + break; + + case ConfigureNotify: + if (event->xconfigure.window != XtWindow (FRAME_X_SHELL_WIDGET (f))) + break; + FRAME_X_SHELL_WIDGET (f)->core.x = event->xconfigure.x; + FRAME_X_SHELL_WIDGET (f)->core.y = event->xconfigure.y; + break; + + default: + break; + } +} + + +/************************************************************************/ +/* timeout events */ +/************************************************************************/ + +static int timeout_id_tick; + +/* Xt interval id's might not fit into an int (they're pointers, as it + happens), so we need to provide a conversion list. */ + +struct Xt_timeout +{ + int id; + XtIntervalId interval_id; + struct Xt_timeout *next; +} *pending_timeouts, *completed_timeouts; + +struct Xt_timeout_blocktype +{ + Blocktype_declare (struct Xt_timeout); +} *the_Xt_timeout_blocktype; + +/* called by XtAppNextEvent() */ +static void +Xt_timeout_callback (XtPointer closure, XtIntervalId *id) +{ + struct Xt_timeout *timeout = (struct Xt_timeout *) closure; + struct Xt_timeout *t2 = pending_timeouts; + /* Remove this one from the list of pending timeouts */ + if (t2 == timeout) + pending_timeouts = pending_timeouts->next; + else + { + while (t2->next && t2->next != timeout) t2 = t2->next; + assert (t2->next); + t2->next = t2->next->next; + } + /* Add this one to the list of completed timeouts */ + timeout->next = completed_timeouts; + completed_timeouts = timeout; +} + +static int +emacs_Xt_add_timeout (EMACS_TIME thyme) +{ + struct Xt_timeout *timeout = Blocktype_alloc (the_Xt_timeout_blocktype); + EMACS_TIME current_time; + int milliseconds; + + timeout->id = timeout_id_tick++; + timeout->next = pending_timeouts; + pending_timeouts = timeout; + EMACS_GET_TIME (current_time); + EMACS_SUB_TIME (thyme, thyme, current_time); + milliseconds = EMACS_SECS (thyme) * 1000 + + EMACS_USECS (thyme) / 1000; + if (milliseconds < 1) + milliseconds = 1; + timeout->interval_id = XtAppAddTimeOut (Xt_app_con, milliseconds, + Xt_timeout_callback, + (XtPointer) timeout); + return timeout->id; +} + +static void +emacs_Xt_remove_timeout (int id) +{ + struct Xt_timeout *timeout, *t2; + + /* Find the timeout on the list of pending ones, if it's still there. */ + if (!pending_timeouts) return; + if (id == pending_timeouts->id) + { + timeout = pending_timeouts; + pending_timeouts = pending_timeouts->next; + } + else + { + t2 = pending_timeouts; + while (t2->next && t2->next->id != id) t2 = t2->next; + if (! t2->next) return; + timeout = t2->next; + t2->next = t2->next->next; + } + + /* At this point, we've found the thing on the list of pending timeouts, + and removed it. + */ + + XtRemoveTimeOut (timeout->interval_id); + Blocktype_free (the_Xt_timeout_blocktype, timeout); +} + +static void +Xt_timeout_to_emacs_event (struct Lisp_Event *emacs_event) +{ + struct Xt_timeout *timeout = completed_timeouts; + assert (timeout); + completed_timeouts = completed_timeouts->next; + emacs_event->event_type = timeout_event; + /* timeout events have nil as channel */ + emacs_event->timestamp = 0; /* #### wrong!! */ + emacs_event->event.timeout.interval_id = timeout->id; + Blocktype_free (the_Xt_timeout_blocktype, timeout); +} + + +/************************************************************************/ +/* process and tty events */ +/************************************************************************/ + +struct what_is_ready_closure +{ + int fd; + Lisp_Object what; + XtInputId id; +}; + +static Lisp_Object *filedesc_with_input; +static struct what_is_ready_closure **filedesc_to_what_closure; + +static void +init_what_input_once (void) +{ + int i; + + filedesc_with_input = (Lisp_Object *) + xmalloc (MAXDESC * sizeof (Lisp_Object)); + filedesc_to_what_closure = (struct what_is_ready_closure **) + xmalloc (MAXDESC * sizeof (struct what_is_ready_closure *)); + + for (i = 0; i < MAXDESC; i++) + { + filedesc_to_what_closure[i] = 0; + filedesc_with_input[i] = Qnil; + } + + process_events_occurred = 0; + tty_events_occurred = 0; +} + +static void +mark_what_as_being_ready (struct what_is_ready_closure *closure) +{ + if (NILP (filedesc_with_input[closure->fd])) + { + SELECT_TYPE temp_mask; + FD_ZERO (&temp_mask); + FD_SET (closure->fd, &temp_mask); + /* Check to make sure there's *really* input available. + Sometimes things seem to get confused and this gets called + for the tty fd when there's really only input available + on some process's fd. (It will subsequently get called + for that process's fd, so returning without setting any + flags will take care of it.) To see the problem, uncomment + the stderr_out below, turn NORMAL_QUIT_CHECK_TIMEOUT_MSECS + down to 25, do sh -c 'xemacs -nw -q -f shell 2>/tmp/log' + and press return repeatedly. (Seen under AIX & Linux.) + -dkindred@cs.cmu.edu */ + if (!poll_fds_for_input (temp_mask)) + { +#if 0 + stderr_out ("mark_what_as_being_ready: no input available (fd=%d)\n", + closure->fd); +#endif + return; + } + filedesc_with_input[closure->fd] = closure->what; + if (PROCESSP (closure->what)) + /* Don't increment this if the current process is already marked + * as having input. */ + process_events_occurred++; + else + tty_events_occurred++; + } +} + +static void +Xt_what_callback (void *closure, int *source, XtInputId *id) +{ + /* If closure is 0, then we got a fake event from a signal handler. + The only purpose of this is to make XtAppProcessEvent() stop + blocking. */ + if (closure) + mark_what_as_being_ready ((struct what_is_ready_closure *) closure); + else + { + fake_event_occurred++; + drain_signal_event_pipe (); + } +} + +static void +select_filedesc (int fd, Lisp_Object what) +{ + struct what_is_ready_closure *closure; + + /* If somebody is trying to select something that's already selected + for, then something went wrong. The generic routines ought to + detect this and error before here. */ + assert (!filedesc_to_what_closure[fd]); + + closure = (struct what_is_ready_closure *) xmalloc (sizeof (*closure)); + closure->fd = fd; + closure->what = what; + closure->id = + XtAppAddInput (Xt_app_con, fd, + (XtPointer) (XtInputReadMask /* | XtInputExceptMask */), + Xt_what_callback, closure); + filedesc_to_what_closure[fd] = closure; +} + +static void +unselect_filedesc (int fd) +{ + struct what_is_ready_closure *closure = filedesc_to_what_closure[fd]; + + assert (closure); + if (!NILP (filedesc_with_input[fd])) + { + /* We are unselecting this process before we have drained the rest of + the input from it, probably from status_notify() in the command loop. + This can happen like so: + + - We are waiting in XtAppNextEvent() + - Process generates output + - Process is marked as being ready + - Process dies, SIGCHLD gets generated before we return (!?) + It could happen I guess. + - sigchld_handler() marks process as dead + - Somehow we end up getting a new KeyPress event on the queue + at the same time (I'm really so sure how that happens but I'm + not sure it can't either so let's assume it can...). + - Key events have priority so we return that instead of the proc. + - Before dispatching the lisp key event we call status_notify() + - Which deselects the process that SIGCHLD marked as dead. + + Thus we never remove it from _with_input and turn it into a lisp + event, so we need to do it here. But this does not mean that we're + throwing away the last block of output - status_notify() has already + taken care of running the proc filter or whatever. + */ + filedesc_with_input[fd] = Qnil; + if (PROCESSP (closure->what)) + { + assert (process_events_occurred > 0); + process_events_occurred--; + } + else + { + assert (tty_events_occurred > 0); + tty_events_occurred--; + } + } + XtRemoveInput (closure->id); + xfree (closure); + filedesc_to_what_closure[fd] = 0; +} + +static void +emacs_Xt_select_process (struct Lisp_Process *p) +{ + int infd; + Lisp_Object process; + + infd = event_stream_unixoid_select_process (p); + + XSETPROCESS (process, p); + select_filedesc (infd, process); +} + +static void +emacs_Xt_unselect_process (struct Lisp_Process *p) +{ + int infd; + + infd = event_stream_unixoid_unselect_process (p); + + unselect_filedesc (infd); +} + +/* This is called from GC when a process object is about to be freed. + If we've still got pointers to it in this file, we're gonna lose hard. + */ +void +debug_process_finalization (struct Lisp_Process *p) +{ +#if 0 /* #### */ + int i; + int infd, outfd; + get_process_file_descriptors (p, &infd, &outfd); + /* if it still has fds, then it hasn't been killed yet. */ + assert (infd < 0); + assert (outfd < 0); + /* Better not still be in the "with input" table; we know it's got no fds. */ + for (i = 0; i < MAXDESC; i++) + { + Lisp_Object process = filedesc_fds_with_input [i]; + assert (!PROCESSP (process) || XPROCESS (process) != p); + } +#endif +} + +static void +Xt_process_to_emacs_event (struct Lisp_Event *emacs_event) +{ + int i; + Lisp_Object process; + + assert (process_events_occurred > 0); + for (i = 0; i < MAXDESC; i++) + { + process = filedesc_with_input[i]; + if (PROCESSP (process)) + break; + } + assert (i < MAXDESC); + filedesc_with_input[i] = Qnil; + process_events_occurred--; + /* process events have nil as channel */ + emacs_event->event_type = process_event; + emacs_event->timestamp = 0; /* #### */ + emacs_event->event.process.process = process; +} + +static void +emacs_Xt_select_console (struct console *con) +{ + Lisp_Object console = Qnil; + int infd; + + if (CONSOLE_X_P (con)) + return; /* X consoles are automatically selected for when we + initialize them in Xt */ + infd = event_stream_unixoid_select_console (con); + XSETCONSOLE (console, con); + select_filedesc (infd, console); +} + +static void +emacs_Xt_unselect_console (struct console *con) +{ + Lisp_Object console = Qnil; + int infd; + + if (CONSOLE_X_P (con)) + return; /* X consoles are automatically selected for when we + initialize them in Xt */ + infd = event_stream_unixoid_unselect_console (con); + XSETCONSOLE (console, con); + unselect_filedesc (infd); +} + +/* read an event from a tty, if one is available. Returns non-zero + if an event was available. Note that when this function is + called, there should always be a tty marked as ready for input. + However, the input condition might actually be EOF, so there + may not really be any input available. (In this case, + read_event_from_tty_or_stream_desc() will arrange for the TTY device + to be deleted.) */ + +static int +Xt_tty_to_emacs_event (struct Lisp_Event *emacs_event) +{ + int i; + + assert (tty_events_occurred > 0); + for (i = 0; i < MAXDESC; i++) + { + Lisp_Object console = filedesc_with_input[i]; + if (CONSOLEP (console)) + { + assert (tty_events_occurred > 0); + tty_events_occurred--; + filedesc_with_input[i] = Qnil; + if (read_event_from_tty_or_stream_desc + (emacs_event, XCONSOLE (console), i)) + return 1; + } + } + + return 0; +} + + +/************************************************************************/ +/* debugging functions to decipher an event */ +/************************************************************************/ + +#ifdef DEBUG_XEMACS +#include "xintrinsicp.h" /* only describe_event() needs this */ +#include <X11/Xproto.h> /* only describe_event() needs this */ + +static void +describe_event_window (Window window, Display *display) +{ + struct frame *f; + Widget w; + stderr_out (" window: 0x%x", (int) window); + w = XtWindowToWidget (display, window); + if (w) + stderr_out (" %s", w->core.widget_class->core_class.class_name); + f = x_any_window_to_frame (get_device_from_display (display), window); + if (f) { + char buf[500]; + sprintf (buf, " \"%s\"", string_data (XSTRING (f->name))); + write_string_to_stdio_stream (stderr, 0, (Bufbyte *) buf, 0, strlen (buf), + FORMAT_DISPLAY); + } + stderr_out ("\n"); +} + +static CONST char * +XEvent_mode_to_string (int mode) +{ + switch (mode) + { + case NotifyNormal: return "Normal"; + case NotifyGrab: return "Grab"; + case NotifyUngrab: return "Ungrab"; + case NotifyWhileGrabbed: return "WhileGrabbed"; + default: + return "???"; + } +} + +static CONST char * +XEvent_detail_to_string (int detail) +{ + switch (detail) + { + case NotifyAncestor: return "Ancestor"; + case NotifyInferior: return "Inferior"; + case NotifyNonlinear: return "Nonlinear"; + case NotifyNonlinearVirtual: return "NonlinearVirtual"; + case NotifyPointer: return "Pointer"; + case NotifyPointerRoot: return "PointerRoot"; + case NotifyDetailNone: return "DetailNone"; + default: + return "???"; + } +} + +static CONST char * +XEvent_visibility_to_string (int state) +{ + switch (state) + { + case VisibilityFullyObscured: return "FullyObscured"; + case VisibilityPartiallyObscured: return "PartiallyObscured"; + case VisibilityUnobscured: return "Unobscured"; + default: + return "???"; + } +} + +static void +describe_event (XEvent *event) +{ + char buf[100]; + struct device *d = get_device_from_display (event->xany.display); + + sprintf (buf, "%s%s", x_event_name (event->type), + event->xany.send_event ? " (send)" : ""); + stderr_out ("%-30s", buf); + switch (event->type) + { + case FocusIn: + case FocusOut: + { + XFocusChangeEvent *ev = &event->xfocus; + describe_event_window (ev->window, ev->display); + stderr_out (" mode: %s\n", XEvent_mode_to_string (ev->mode)); + stderr_out (" detail: %s\n", XEvent_detail_to_string(ev->detail)); + break; + } + + case KeyPress: + { + Lisp_Object keysym; + XKeyEvent *ev = &event->xkey; + unsigned int state = ev->state; + + describe_event_window (ev->window, ev->display); + stderr_out (" subwindow: %ld\n", ev->subwindow); + stderr_out (" state: "); + if (state & ShiftMask) stderr_out ("Shift "); + if (state & LockMask) stderr_out ("Lock "); + if (state & ControlMask) stderr_out ("Control "); + if (state & Mod1Mask) stderr_out ("Mod1 "); + if (state & Mod2Mask) stderr_out ("Mod2 "); + if (state & Mod3Mask) stderr_out ("Mod3 "); + if (state & Mod4Mask) stderr_out ("Mod4 "); + if (state & Mod5Mask) stderr_out ("Mod5 "); +#if 0 /* Apparently these don't exist? */ + if (state & MetaMask) stderr_out ("Meta "); + if (state & SuperMask) stderr_out ("Super "); + if (state & HyperMask) stderr_out ("Hyper "); + if (state & AltMask) stderr_out ("Alt "); + if (state & ModeMask) stderr_out ("Mode_switch "); +#endif + + if (! state) + stderr_out ("vanilla\n"); + else + stderr_out ("\n"); + if (x_key_is_modifier_p (ev->keycode, d)) + stderr_out (" Modifier key"); + stderr_out (" keycode: 0x%x\n", ev->keycode); + keysym = x_to_emacs_keysym (event, 0); + if (CHAR_OR_CHAR_INTP (keysym)) + { + if (XCHAR_OR_CHAR_INT (keysym) > 32 + && XCHAR_OR_CHAR_INT (keysym) < 127) + stderr_out (" keysym: %c\n", XCHAR_OR_CHAR_INT (keysym)); + else + stderr_out (" keysym: %d\n", XCHAR_OR_CHAR_INT (keysym)); + } + else + stderr_out (" keysym: %s\n", string_data (XSYMBOL (keysym)->name)); + } + break; + + case Expose: + if (x_debug_events > 1) + { + XExposeEvent *ev = &event->xexpose; + describe_event_window (ev->window, ev->display); + stderr_out (" region: %d %d %d %d\n", ev->x, ev->y, + ev->width, ev->height); + stderr_out (" count: %d\n", ev->count); + } + else + stderr_out ("\n"); + break; + + case GraphicsExpose: + if (x_debug_events > 1) + { + XGraphicsExposeEvent *ev = &event->xgraphicsexpose; + describe_event_window (ev->drawable, ev->display); + stderr_out (" major: %s\n", + (ev ->major_code == X_CopyArea ? "CopyArea" : + (ev->major_code == X_CopyPlane ? "CopyPlane" : "?"))); + stderr_out (" region: %d %d %d %d\n", ev->x, ev->y, + ev->width, ev->height); + stderr_out (" count: %d\n", ev->count); + } + else + stderr_out ("\n"); + break; + + case EnterNotify: + case LeaveNotify: + if (x_debug_events > 1) + { + XCrossingEvent *ev = &event->xcrossing; + describe_event_window (ev->window, ev->display); +#if 0 + stderr_out(" subwindow: 0x%x\n", ev->subwindow); + stderr_out(" pos: %d %d\n", ev->x, ev->y); + stderr_out(" root pos: %d %d\n", ev->x_root, ev->y_root); +#endif + stderr_out(" mode: %s\n", XEvent_mode_to_string(ev->mode)); + stderr_out(" detail: %s\n", XEvent_detail_to_string(ev->detail)); + stderr_out(" focus: %d\n", ev->focus); +#if 0 + stderr_out(" state: 0x%x\n", ev->state); +#endif + } + else + stderr_out("\n"); + break; + + case ConfigureNotify: + if (x_debug_events > 1) + { + XConfigureEvent *ev = &event->xconfigure; + describe_event_window (ev->window, ev->display); + stderr_out(" above: 0x%lx\n", ev->above); + stderr_out(" size: %d %d %d %d\n", ev->x, ev->y, + ev->width, ev->height); + stderr_out(" redirect: %d\n", ev->override_redirect); + } + else + stderr_out("\n"); + break; + + case VisibilityNotify: + if (x_debug_events > 1) + { + XVisibilityEvent *ev = &event->xvisibility; + describe_event_window (ev->window, ev->display); + stderr_out(" state: %s\n", XEvent_visibility_to_string(ev->state)); + } + else + stderr_out ("\n"); + break; + + case ClientMessage: + { + XClientMessageEvent *ev = &event->xclient; + char *name = XGetAtomName (ev->display, ev->message_type); + stderr_out ("%s", name); + if (!strcmp (name, "WM_PROTOCOLS")) { + char *protname = XGetAtomName (ev->display, ev->data.l[0]); + stderr_out ("(%s)", protname); + XFree (protname); + } + XFree (name); + stderr_out ("\n"); + break; + } + + default: + stderr_out ("\n"); + break; + } + + fflush (stdout); +} + +#endif /* include describe_event definition */ + + +/************************************************************************/ +/* get the next event from Xt */ +/************************************************************************/ + +static Lisp_Object dispatch_event_queue, dispatch_event_queue_tail; + +static void +enqueue_Xt_dispatch_event (Lisp_Object event) +{ + enqueue_event (event, &dispatch_event_queue, &dispatch_event_queue_tail); +} + +Lisp_Object +dequeue_Xt_dispatch_event (void) +{ + return dequeue_event (&dispatch_event_queue, &dispatch_event_queue_tail); +} + +/* This business exists because menu events "happen" when + menubar_selection_callback() is called from somewhere deep + within XtAppProcessEvent in emacs_Xt_next_event(). The + callback needs to terminate the modal loop in that function + or else it will continue waiting until another event is + received. + + Same business applies to scrollbar events. */ + +void +signal_special_Xt_user_event (Lisp_Object channel, Lisp_Object function, + Lisp_Object object) +{ + Lisp_Object event; + + event = Fmake_event (); + + XEVENT (event)->event_type = misc_user_event; + XEVENT (event)->channel = channel; + XEVENT (event)->event.eval.function = function; + XEVENT (event)->event.eval.object = object; + + enqueue_Xt_dispatch_event (event); +} + +static void +emacs_Xt_next_event (struct Lisp_Event *emacs_event) +{ + we_didnt_get_an_event: + + while (NILP (dispatch_event_queue) && + !completed_timeouts && + !fake_event_occurred && + !process_events_occurred && + !tty_events_occurred) + { + + /* Stupid logic in XtAppProcessEvent() dictates that, if process + events and X events are both available, the process event gets + taken first. This will cause an infinite loop if we're being + called from Fdiscard_input(). + */ + if (XtAppPending (Xt_app_con) & XtIMXEvent) + XtAppProcessEvent (Xt_app_con, XtIMXEvent); + else + { + Lisp_Object devcons, concons; + + /* We're about to block. Xt has a bug in it (big surprise, + there) in that it blocks using select() and doesn't + flush the Xlib output buffers (XNextEvent() does this + automatically before blocking). So it's necessary + for us to do this ourselves. If we don't do it, then + display output may not be seen until the next time + an X event is received. (This happens esp. with + subprocess output that gets sent to a visible buffer.) + + #### The above comment may not have any validity. */ + + DEVICE_LOOP_NO_BREAK (devcons, concons) + { + struct device *d; + d = XDEVICE (XCAR (devcons)); + + if (DEVICE_X_P (d) && DEVICE_X_DISPLAY (d)) + /* emacs may be exiting */ + XFlush (DEVICE_X_DISPLAY (d)); + } + XtAppProcessEvent (Xt_app_con, XtIMAll); + } + } + + if (!NILP (dispatch_event_queue)) + { + Lisp_Object event, event2; + XSETEVENT (event2, emacs_event); + event = dequeue_Xt_dispatch_event (); + Fcopy_event (event, event2); + Fdeallocate_event (event); + } + else if (tty_events_occurred) + { + if (!Xt_tty_to_emacs_event (emacs_event)) + goto we_didnt_get_an_event; + } + else if (completed_timeouts) + Xt_timeout_to_emacs_event (emacs_event); + else if (fake_event_occurred) + { + /* A dummy event, so that a cycle of the command loop will + occur. */ + fake_event_occurred = 0; + /* eval events have nil as channel */ + emacs_event->event_type = eval_event; + emacs_event->event.eval.function = Qidentity; + emacs_event->event.eval.object = Qnil; + } + else /* if (process_events_occurred) */ + Xt_process_to_emacs_event (emacs_event); + + /* No need to call XFilterEvent; Xt does it for us */ +} + +void +emacs_Xt_event_handler (Widget wid /* unused */, + XtPointer closure /* unused */, + XEvent *event, + Boolean *continue_to_dispatch /* unused */) +{ + Lisp_Object emacs_event = Fmake_event (); + +#ifdef DEBUG_XEMACS + if (x_debug_events > 0) + { + describe_event (event); + } +#endif /* DEBUG_XEMACS */ + if (x_event_to_emacs_event (event, XEVENT (emacs_event))) + enqueue_Xt_dispatch_event (emacs_event); + else + Fdeallocate_event (emacs_event); +} + + +/************************************************************************/ +/* input pending / C-g checking */ +/************************************************************************/ + +static Bool +quit_char_predicate (Display *display, XEvent *event, XPointer data) +{ + struct device *d = get_device_from_display (display); + struct x_device *xd = DEVICE_X_DATA (d); + char c, quit_char; + Bool *critical = (Bool *) data; + Lisp_Object keysym; + + if (critical) *critical = False; + if (event->type != KeyPress) return 0; + if (! x_any_window_to_frame (d, event->xany.window)) return 0; + if (event->xkey.state + & (xd->MetaMask | xd->HyperMask | xd->SuperMask | xd->AltMask)) + return 0; + + /* This duplicates some code that exists elsewhere, but it's relatively + fast and doesn't cons. + */ + keysym = x_to_emacs_keysym (event, 1); + if (NILP (keysym)) return 0; + if (CHAR_OR_CHAR_INTP (keysym)) + c = XCHAR_OR_CHAR_INT (keysym); + /* Highly doubtful that these are the quit character, but... */ + else if (EQ (keysym, QKbackspace)) c = '\b'; + else if (EQ (keysym, QKtab)) c = '\t'; + else if (EQ (keysym, QKlinefeed)) c = '\n'; + else if (EQ (keysym, QKreturn)) c = '\r'; + else if (EQ (keysym, QKescape)) c = 27; + else if (EQ (keysym, QKspace)) c = ' '; + else if (EQ (keysym, QKdelete)) c = 127; + else return 0; + + if (event->xkey.state & xd->MetaMask) c |= 0x80; + if ((event->xkey.state & ControlMask) && !(c >= 'A' && c <= 'Z')) + c &= 0x1F; /* unshifted control characters */ + quit_char = CONSOLE_QUIT_CHAR (XCONSOLE (DEVICE_CONSOLE (d))); + if (c == quit_char) + return True; + /* If we've got Control-Shift-G instead of Control-G, that means + we have a critical_quit. Caps_Lock is its own modifier, so it + won't cause ^G to act differently than before. */ + if (event->xkey.state & ControlMask) c &= 0x1F; + if (c == quit_char) + { + if (critical) *critical = True; + return True; + } + return False; +} + +/* This scans the X input queue for a KeyPress event that matches the + quit character, and sets Vquit_flag. This is called from the + QUIT macro to determine whether we should quit. + + In a SIGIO world, this won't be called unless a SIGIO has happened + since the last time we checked. + + In a non-SIGIO world, this is called from emacs_Xt_event_pending_p + (which is called from input_pending_p). + */ +static void +x_check_for_quit_char (Display *display) +{ + XEvent event; + int queued; + Bool critical_quit = False; + XEventsQueued (display, QueuedAfterReading); + queued = XCheckIfEvent (display, &event, + quit_char_predicate, + (XtPointer)&critical_quit); + if (queued) + { + Vquit_flag = (critical_quit ? Qcritical : Qt); + /* don't put the event back onto the queue. Those functions that + wanted to read a ^G directly have arranged to do this. */ + } +} + +static void +check_for_tty_quit_char (struct device *d) +{ + SELECT_TYPE temp_mask; + int infd = DEVICE_INFD (d); + struct console *con = XCONSOLE (DEVICE_CONSOLE (d)); + Emchar quit_char = CONSOLE_QUIT_CHAR (con); + + FD_ZERO (&temp_mask); + FD_SET (infd, &temp_mask); + + while (1) + { + Lisp_Object event; + Emchar the_char; + + if (!poll_fds_for_input (temp_mask)) + return; + + event = Fmake_event (); + if (!read_event_from_tty_or_stream_desc (XEVENT (event), con, infd)) + /* EOF, or something ... */ + return; + /* #### bogus. quit-char should be allowed to be any sort + of event. */ + the_char = event_to_character (XEVENT (event), 1, 0, 0); + if (the_char >= 0 && the_char == quit_char) + { + Vquit_flag = Qt; + /* do not queue the C-g. See above. */ + return; + } + + /* queue the read event to be read for real later. */ + enqueue_Xt_dispatch_event (event); + } +} + +static void +emacs_Xt_quit_p (void) +{ + Lisp_Object devcons, concons; + CONSOLE_LOOP (concons) + { + struct console *con = XCONSOLE (XCAR (concons)); + if (!con->input_enabled) + continue; + + CONSOLE_DEVICE_LOOP (devcons, con) + { + struct device *d; + d = XDEVICE (XCAR (devcons)); + + if (DEVICE_X_P (d) && DEVICE_X_DISPLAY (d)) + /* emacs may be exiting */ + x_check_for_quit_char (DEVICE_X_DISPLAY (d)); + else if (DEVICE_TTY_P (d)) + check_for_tty_quit_char (d); + } + } +} + +static void +drain_X_queue (void) +{ + while (XtAppPending (Xt_app_con) & XtIMXEvent) + XtAppProcessEvent (Xt_app_con, XtIMXEvent); +} + +static int +emacs_Xt_event_pending_p (int user_p) +{ + Lisp_Object event; + int tick_count_val; + + /* If `user_p' is false, then this function returns whether there are any + X, timeout, or fd events pending (that is, whether emacs_Xt_next_event() + would return immediately without blocking). + + if `user_p' is true, then this function returns whether there are any + *user generated* events available (that is, whether there are keyboard + or mouse-click events ready to be read). This also implies that + emacs_Xt_next_event() would not block. + + In a non-SIGIO world, this also checks whether the user has typed ^G, + since this is a convenient place to do so. We don't need to do this + in a SIGIO world, since input causes an interrupt. + */ + +#if 0 + /* I don't think there's any point to this and it will nullify + the speed gains achieved by the sigio_happened checking below. + Its only advantage is that it may possibly make C-g response + a bit faster. The C-g will be noticed within 0.25 second, anyway, + even without this. */ +#ifndef SIGIO + /* First check for C-g if necessary */ + emacs_Xt_quit_p (); +#endif +#endif + + /* This function used to simply check whether there were any X + events (or is user_p was 1, it iterated over all the pending + X events using XCheckIfEvent(), looking for keystrokes and + button events). That worked in the old cheesoid event loop, + which didn't go through XtAppDispatchEvent(), but it doesn't + work any more -- X events may not result in anything. For + example, a button press in a blank part of the menubar appears + as an X event but will not result in any Emacs events (a + button press that activates the menubar results in an Emacs + event through the stop_next_event mechanism). + + The only accurate way of determining whether these X events + translate into Emacs events is to go ahead and dispatch them + until there's something on the dispatch queue. */ + + /* See if there are any user events already on the queue. */ + EVENT_CHAIN_LOOP (event, dispatch_event_queue) + if (!user_p || command_event_p (event)) + return 1; + + /* See if there's any TTY input available. + */ + if (poll_fds_for_input (tty_only_mask)) + return 1; + + if (!user_p) + { + /* If not user_p and there are any timer or file-desc events + pending, we know there will be an event so we're through. */ + XtInputMask pending_value; + + /* Note that formerly we just checked the value of XtAppPending() + to determine if there was file-desc input. This doesn't + work any more with the signal_event_pipe; XtAppPending() + will says "yes" in this case but there isn't really any + input. Another way of fixing this problem is for the + signal_event_pipe to generate actual input in the form + of an identity eval event or something. (#### maybe this + actually happens?) */ + + if (poll_fds_for_input (process_only_mask)) + return 1; + + pending_value = XtAppPending (Xt_app_con); + + if (pending_value & XtIMTimer) + return 1; + } + + /* XtAppPending() can be super-slow, esp. over a network connection. + Quantify results have indicated that in some cases the + call to detect_input_pending() completely dominates the + running time of redisplay(). Fortunately, in a SIGIO world + we can more quickly determine whether there are any X events: + if an event has happened since the last time we checked, then + a SIGIO will have happened. On a machine with broken SIGIO, + we'll still be in an OK state -- the sigio_happened flag + will get set at least once a second, so we'll be no more than + one second behind reality. (In general it's OK if we + erroneously report no input pending when input is actually + pending() -- preemption is just a bit less efficient, that's + all. It's bad bad bad if you err the other way -- you've + promised that `next-event' won't block but it actually will, + and some action might get delayed until the next time you + hit a key.) + */ + + /* quit_check_signal_tick_count is volatile so try to avoid race conditions + by using a temporary variable */ + tick_count_val = quit_check_signal_tick_count; + if (last_quit_check_signal_tick_count != tick_count_val) + { + last_quit_check_signal_tick_count = tick_count_val; + + /* We need to drain the entire queue now -- if we only + drain part of it, we may later on end up with events + actually pending but detect_input_pending() returning + false because there wasn't another SIGIO. */ + drain_X_queue (); + + EVENT_CHAIN_LOOP (event, dispatch_event_queue) + if (!user_p || command_event_p (event)) + return 1; + } + + return 0; +} + + +/************************************************************************/ +/* replacement for standard string-to-pixel converter */ +/************************************************************************/ + +/* This was constructed by ripping off the standard string-to-pixel + converter from Converters.c in the Xt source code and modifying + appropriately. */ + +#if 0 + +/* This is exported by the Xt library (at least by mine). If this + isn't the case somewhere, rename this appropriately and remove + the '#if 0'. Note, however, that I got "unknown structure" + errors when I tried this. */ +XtConvertArgRec Const colorConvertArgs[] = { + {XtWidgetBaseOffset, (XtPointer)XtOffsetOf(WidgetRec, core.screen), + sizeof(Screen *)}, + {XtWidgetBaseOffset, (XtPointer)XtOffsetOf(WidgetRec, core.colormap), + sizeof(Colormap)} +}; + +#endif + +#define done(type, value) \ + if (toVal->addr != NULL) { \ + if (toVal->size < sizeof(type)) { \ + toVal->size = sizeof(type); \ + return False; \ + } \ + *(type*)(toVal->addr) = (value); \ + } else { \ + static type static_val; \ + static_val = (value); \ + toVal->addr = (XPointer)&static_val; \ + } \ + toVal->size = sizeof(type); \ + return True /* Caller supplies `;' */ + +static +Boolean EmacsXtCvtStringToPixel ( + Display *dpy, + XrmValuePtr args, + Cardinal *num_args, + XrmValuePtr fromVal, + XrmValuePtr toVal, + XtPointer *closure_ret) +{ + String str = (String)fromVal->addr; + XColor screenColor; + XColor exactColor; + Screen *screen; + Colormap colormap; + Status status; + String params[1]; + Cardinal num_params = 1; + XtAppContext the_app_con = XtDisplayToApplicationContext (dpy); + + if (*num_args != 2) { + XtAppWarningMsg(the_app_con, "wrongParameters", "cvtStringToPixel", + "XtToolkitError", + "String to pixel conversion needs screen and colormap arguments", + (String *)NULL, (Cardinal *)NULL); + return False; + } + + screen = *((Screen **) args[0].addr); + colormap = *((Colormap *) args[1].addr); + + /* The original uses the private function CompareISOLatin1(). + Use XmuCompareISOLatin1() if you want, but I don't think it + makes any difference here. */ + if (strcmp(str, XtDefaultBackground) == 0) { + *closure_ret = False; + /* This refers to the display's "*reverseVideo" resource. + These display resources aren't documented anywhere that + I can find, so I'm going to ignore this. */ + /* if (pd->rv) done(Pixel, BlackPixelOfScreen(screen)) else */ + done(Pixel, WhitePixelOfScreen(screen)); + } + if (strcmp(str, XtDefaultForeground) == 0) { + *closure_ret = False; + /* if (pd->rv) done(Pixel, WhitePixelOfScreen(screen)) else */ + done(Pixel, BlackPixelOfScreen(screen)); + } + + /* Originally called XAllocNamedColor() here. */ + status = XParseColor (DisplayOfScreen(screen), colormap, (char*)str, + &screenColor); + if (status) { + status = allocate_nearest_color (DisplayOfScreen(screen), colormap, + &screenColor); + } + + if (status == 0) { + params[0] = str; + /* Server returns a specific error code but Xlib discards it. Ugh */ + if (XLookupColor(DisplayOfScreen(screen), colormap, (char*)str, + &exactColor, &screenColor)) { + XtAppWarningMsg(the_app_con, "noColormap", "cvtStringToPixel", + "XtToolkitError", + "Cannot allocate colormap entry for \"%s\"", + params, &num_params); + + } else { + XtAppWarningMsg(the_app_con, "badValue", "cvtStringToPixel", + "XtToolkitError", + "Color name \"%s\" is not defined", params, &num_params); + } + + *closure_ret = False; + return False; + } else { + *closure_ret = (char*)True; + done(Pixel, screenColor.pixel); + } +} + +/* ARGSUSED */ +static void EmacsFreePixel ( + XtAppContext app, + XrmValuePtr toVal, + XtPointer closure, + XrmValuePtr args, + Cardinal *num_args) +{ + if (*num_args != 2) { + XtAppWarningMsg(app, "wrongParameters","freePixel","XtToolkitError", + "Freeing a pixel requires screen and colormap arguments", + (String *)NULL, (Cardinal *)NULL); + return; + } + + if (closure) { + Screen *screen = *((Screen **) args[0].addr); + Colormap colormap = *((Colormap *) args[1].addr); + XFreeColors(DisplayOfScreen(screen), colormap, + (unsigned long*)toVal->addr, 1, (unsigned long)0); + } +} + + +/************************************************************************/ +/* initialization */ +/************************************************************************/ + +void +syms_of_event_Xt (void) +{ + defsymbol (&Qkey_mapping, "key-mapping"); +} + +void +vars_of_event_Xt (void) +{ + dispatch_event_queue = Qnil; + staticpro (&dispatch_event_queue); + dispatch_event_queue_tail = Qnil; + + /* this function only makes safe calls */ + init_what_input_once (); + + Xt_event_stream = + (struct event_stream *) xmalloc (sizeof (struct event_stream)); + Xt_event_stream->event_pending_p = emacs_Xt_event_pending_p; + Xt_event_stream->next_event_cb = emacs_Xt_next_event; + Xt_event_stream->handle_magic_event_cb= emacs_Xt_handle_magic_event; + Xt_event_stream->add_timeout_cb = emacs_Xt_add_timeout; + Xt_event_stream->remove_timeout_cb = emacs_Xt_remove_timeout; + Xt_event_stream->select_console_cb = emacs_Xt_select_console; + Xt_event_stream->unselect_console_cb = emacs_Xt_unselect_console; + Xt_event_stream->select_process_cb = emacs_Xt_select_process; + Xt_event_stream->unselect_process_cb = emacs_Xt_unselect_process; + Xt_event_stream->quit_p_cb = emacs_Xt_quit_p; + + DEFVAR_BOOL ("modifier-keys-are-sticky", &modifier_keys_are_sticky /* +*Non-nil makes modifier keys sticky. +This means that you can release the modifier key before pressing down +the key that you wish to be modified. Although this is non-standard +behavior, it is recommended because it reduces the strain on your hand, +thus reducing the incidence of the dreaded Emacs-pinky syndrome. +*/ ); + modifier_keys_are_sticky = 0; + + DEFVAR_BOOL ("x-allow-sendevents", &x_allow_sendevents /* +*Non-nil means to allow synthetic events. Nil means they are ignored. +Beware: allowing emacs to process SendEvents opens a big security hole. +*/ ); + x_allow_sendevents = 0; + +#ifdef DEBUG_XEMACS + DEFVAR_INT ("x-debug-events", &x_debug_events /* +If non-zero, display debug information about X events that XEmacs sees. +Information is displayed on stderr. Currently defined values are: + +1 == non-verbose output +2 == verbose output +*/ ); + x_debug_events = 0; +#endif + + the_Xt_timeout_blocktype = Blocktype_new (struct Xt_timeout_blocktype); + + last_quit_check_signal_tick_count = 0; +} + +void +init_event_Xt_late (void) /* called when already initialized */ +{ + timeout_id_tick = 1; + pending_timeouts = 0; + completed_timeouts = 0; + + event_stream = Xt_event_stream; + XtToolkitInitialize (); + Xt_app_con = XtCreateApplicationContext (); + XtAppSetFallbackResources (Xt_app_con, (String *) x_fallback_resources); + + /* In xselect.c */ + x_selection_timeout = (XtAppGetSelectionTimeout (Xt_app_con) / 1000); + XSetErrorHandler (x_error_handler); + XSetIOErrorHandler (x_IO_error_handler); + + XtAppAddInput (Xt_app_con, signal_event_pipe[0], + (XtPointer) (XtInputReadMask /* | XtInputExceptMask */), + Xt_what_callback, 0); + + XtAppSetTypeConverter (Xt_app_con, XtRString, XtRPixel, + EmacsXtCvtStringToPixel, + (XtConvertArgList) colorConvertArgs, + 2, XtCacheByDisplay, EmacsFreePixel); +}