The TTY case is resolved: notifications now work even if Emacs

[bpt/emacs.git] / src / w32inevt.c

/* Input event support for Emacs on the Microsoft Windows API.
   Copyright (C) 1992-1993, 1995, 2001-2012  Free Software Foundation, Inc.

This file is part of GNU Emacs.

GNU Emacs is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

GNU Emacs is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */

/*
   Drew Bliss                   01-Oct-93
     Adapted from ntkbd.c by Tim Fleehart
*/


#include <config.h>
#include <stdio.h>
#include <windows.h>

#ifndef MOUSE_MOVED
#define MOUSE_MOVED   1
#endif

#include "lisp.h"
#include "keyboard.h"
#include "frame.h"
#include "dispextern.h"
#include "window.h"
#include "blockinput.h"
#include "termhooks.h"
#include "termchar.h"
#include "w32heap.h"
#include "w32term.h"
#include "w32inevt.h"

/* stdin, from w32console.c */
extern HANDLE keyboard_handle;

/* Info for last mouse motion */
static COORD movement_pos;
static Time movement_time;

/* from w32fns.c */
extern unsigned int map_keypad_keys (unsigned int, unsigned int);
extern unsigned int w32_key_to_modifier (int key);

/* Event queue */
#define EVENT_QUEUE_SIZE 50
static INPUT_RECORD event_queue[EVENT_QUEUE_SIZE];
static INPUT_RECORD *queue_ptr = event_queue, *queue_end = event_queue;

/* Temporarily store lead byte of DBCS input sequences.  */
static char dbcs_lead = 0;

static inline BOOL
w32_read_console_input (HANDLE h, INPUT_RECORD *rec, DWORD recsize,
			DWORD *waiting)
{
  return (w32_console_unicode_input
	  ? ReadConsoleInputW (h, rec, recsize, waiting)
	  : ReadConsoleInputA (h, rec, recsize, waiting));
}

/* Set by w32_console_toggle_lock_key.  */
int faked_key;

static int
fill_queue (BOOL block)
{
  BOOL rc;
  DWORD events_waiting;

  if (queue_ptr < queue_end)
    return queue_end-queue_ptr;

  if (!block)
    {
      /* Check to see if there are some events to read before we try
	 because we can't block.  */
      if (!GetNumberOfConsoleInputEvents (keyboard_handle, &events_waiting))
	return -1;
      if (events_waiting == 0)
	return 0;
    }

  rc = w32_read_console_input (keyboard_handle, event_queue, EVENT_QUEUE_SIZE,
			       &events_waiting);
  if (!rc)
    return -1;
  queue_ptr = event_queue;
  queue_end = event_queue + events_waiting;
  return (int) events_waiting;
}

/* In a generic, multi-frame world this should take a console handle
   and return the frame for it

   Right now, there's only one frame so return it.  */
static FRAME_PTR
get_frame (void)
{
  return SELECTED_FRAME ();
}

/* Translate console modifiers to emacs modifiers.
   German keyboard support (Kai Morgan Zeise 2/18/95).  */


#if 0
/* Return nonzero if the virtual key is a dead key.  */
static int
is_dead_key (int wparam)
{
  unsigned int code = MapVirtualKey (wparam, 2);

  /* Windows 95 returns 0x8000, NT returns 0x80000000.  */
  return (code & 0x80008000) ? 1 : 0;
}
#endif

/* The return code indicates key code size.  cpID is the codepage to
   use for translation to Unicode; -1 means use the current console
   input codepage.  */


/* return code -1 means that event_queue_ptr won't be incremented.
   In other word, this event makes two key codes.   (by himi)       */
static int
key_event (KEY_EVENT_RECORD *event, struct input_event *emacs_ev, int *isdead)
{
  static int mod_key_state = 0;
  int wParam;

  *isdead = 0;

  /* Skip key-up events.  */
  if (!event->bKeyDown)
    {
      switch (event->wVirtualKeyCode)
	{
	case VK_LWIN:
	  mod_key_state &= ~LEFT_WIN_PRESSED;
	  break;
	case VK_RWIN:
	  mod_key_state &= ~RIGHT_WIN_PRESSED;
	  break;
	case VK_APPS:
	  mod_key_state &= ~APPS_PRESSED;
	  break;
	}
      return 0;
    }

  /* Ignore keystrokes we fake ourself; see below.  */
  if (faked_key == event->wVirtualKeyCode)
    {
      faked_key = 0;
      return 0;
    }

  /* To make it easier to debug this code, ignore modifier keys!  */
  switch (event->wVirtualKeyCode)
    {
    case VK_LWIN:
      if (NILP (Vw32_pass_lwindow_to_system))
	{
	  /* Prevent system from acting on keyup (which opens the Start
	     menu if no other key was pressed) by simulating a press of
	     Space which we will ignore.  */
	  if ((mod_key_state & LEFT_WIN_PRESSED) == 0)
	    {
	      if (NUMBERP (Vw32_phantom_key_code))
		faked_key = XUINT (Vw32_phantom_key_code) & 255;
	      else
		faked_key = VK_SPACE;
	      keybd_event (faked_key, (BYTE) MapVirtualKey (faked_key, 0), 0, 0);
	    }
	}
      mod_key_state |= LEFT_WIN_PRESSED;
      if (!NILP (Vw32_lwindow_modifier))
	return 0;
      break;
    case VK_RWIN:
      if (NILP (Vw32_pass_rwindow_to_system))
	{
	  if ((mod_key_state & RIGHT_WIN_PRESSED) == 0)
	    {
	      if (NUMBERP (Vw32_phantom_key_code))
		faked_key = XUINT (Vw32_phantom_key_code) & 255;
	      else
		faked_key = VK_SPACE;
	      keybd_event (faked_key, (BYTE) MapVirtualKey (faked_key, 0), 0, 0);
	    }
	}
      mod_key_state |= RIGHT_WIN_PRESSED;
      if (!NILP (Vw32_rwindow_modifier))
	return 0;
      break;
    case VK_APPS:
      mod_key_state |= APPS_PRESSED;
      if (!NILP (Vw32_apps_modifier))
	return 0;
      break;
    case VK_CAPITAL:
      /* Decide whether to treat as modifier or function key.  */
      if (NILP (Vw32_enable_caps_lock))
	goto disable_lock_key;
      return 0;
    case VK_NUMLOCK:
      /* Decide whether to treat as modifier or function key.  */
      if (NILP (Vw32_enable_num_lock))
	goto disable_lock_key;
      return 0;
    case VK_SCROLL:
      /* Decide whether to treat as modifier or function key.  */
      if (NILP (Vw32_scroll_lock_modifier))
	goto disable_lock_key;
      return 0;
    disable_lock_key:
      /* Ensure the appropriate lock key state is off (and the
	 indicator light as well).  */
      wParam = event->wVirtualKeyCode;
      if (GetAsyncKeyState (wParam) & 0x8000)
	{
	  /* Fake another press of the relevant key.  Apparently, this
	     really is the only way to turn off the indicator.  */
	  faked_key = wParam;
	  keybd_event ((BYTE) wParam, (BYTE) MapVirtualKey (wParam, 0),
		       KEYEVENTF_EXTENDEDKEY | KEYEVENTF_KEYUP, 0);
	  keybd_event ((BYTE) wParam, (BYTE) MapVirtualKey (wParam, 0),
		       KEYEVENTF_EXTENDEDKEY | 0, 0);
	  keybd_event ((BYTE) wParam, (BYTE) MapVirtualKey (wParam, 0),
		       KEYEVENTF_EXTENDEDKEY | KEYEVENTF_KEYUP, 0);
	}
      break;
    case VK_MENU:
    case VK_CONTROL:
    case VK_SHIFT:
      return 0;
    case VK_CANCEL:
      /* Windows maps Ctrl-Pause (aka Ctrl-Break) into VK_CANCEL,
	 which is confusing for purposes of key binding; convert
	 VK_CANCEL events into VK_PAUSE events.  */
      event->wVirtualKeyCode = VK_PAUSE;
      break;
    case VK_PAUSE:
      /* Windows maps Ctrl-NumLock into VK_PAUSE, which is confusing
	 for purposes of key binding; convert these back into
	 VK_NUMLOCK events, at least when we want to see NumLock key
	 presses.  (Note that there is never any possibility that
	 VK_PAUSE with Ctrl really is C-Pause as per above.)  */
      if (NILP (Vw32_enable_num_lock)
	  && (event->dwControlKeyState
	      & (LEFT_CTRL_PRESSED | RIGHT_CTRL_PRESSED)) != 0)
	event->wVirtualKeyCode = VK_NUMLOCK;
      break;
    }

  /* Recognize state of Windows and Apps keys.  */
  event->dwControlKeyState |= mod_key_state;

  /* Distinguish numeric keypad keys from extended keys.  */
  event->wVirtualKeyCode =
    map_keypad_keys (event->wVirtualKeyCode,
		     (event->dwControlKeyState & ENHANCED_KEY));

  if (lispy_function_keys[event->wVirtualKeyCode] == 0)
    {
      if (!NILP (Vw32_recognize_altgr)
	  && (event->dwControlKeyState & LEFT_CTRL_PRESSED)
	  && (event->dwControlKeyState & RIGHT_ALT_PRESSED))
	{
	  /* Don't try to interpret AltGr key chords; ToAscii seems not
	     to process them correctly.  */
	}
      /* Handle key chords including any modifiers other than shift
         directly, in order to preserve as much modifier information as
         possible.  */
      else if (event->dwControlKeyState
	       & (  RIGHT_CTRL_PRESSED | LEFT_CTRL_PRESSED
		  | RIGHT_ALT_PRESSED | LEFT_ALT_PRESSED
		  | (!NILP (Vw32_lwindow_modifier) ? LEFT_WIN_PRESSED : 0)
		  | (!NILP (Vw32_rwindow_modifier) ? RIGHT_WIN_PRESSED : 0)
		  | (!NILP (Vw32_apps_modifier) ? APPS_PRESSED : 0)
		  | (!NILP (Vw32_scroll_lock_modifier) ? SCROLLLOCK_ON : 0)))
	{
	  /* Don't translate modified alphabetic keystrokes, so the user
	     doesn't need to constantly switch layout to type control or
	     meta keystrokes when the normal layout translates
	     alphabetic characters to non-ascii characters.  */
	  if ('A' <= event->wVirtualKeyCode && event->wVirtualKeyCode <= 'Z')
	    {
	      event->uChar.AsciiChar = event->wVirtualKeyCode;
	      if ((event->dwControlKeyState & SHIFT_PRESSED) == 0)
		event->uChar.AsciiChar += ('a' - 'A');
	    }
	  /* Try to handle unrecognized keystrokes by determining the
             base character (ie. translating the base key plus shift
             modifier).  */
	  else if (event->uChar.AsciiChar == 0)
	    w32_kbd_patch_key (event, -1);
	}

      if (event->uChar.AsciiChar == 0)
	{
	  emacs_ev->kind = NO_EVENT;
	  return 0;
	}
      else if (event->uChar.AsciiChar > 0)
	{
	  /* Pure ASCII characters < 128.  */
	  emacs_ev->kind = ASCII_KEYSTROKE_EVENT;
	  emacs_ev->code = event->uChar.AsciiChar;
	}
      else if (event->uChar.UnicodeChar > 0
	       && w32_console_unicode_input)
	{
	  /* Unicode codepoint; only valid if we are using Unicode
	     console input mode.  */
	  emacs_ev->kind = MULTIBYTE_CHAR_KEYSTROKE_EVENT;
	  emacs_ev->code = event->uChar.UnicodeChar;
	}
      else
	{
	  /* Fallback handling of non-ASCII characters for non-Unicode
	     versions of Windows, and for non-Unicode input on NT
	     family of Windows.  Only characters in the current
	     console codepage are supported by this fallback.  */
	  wchar_t code;
	  char dbcs[2];
          int cpId;

	  /* Get the current console input codepage to interpret this
	     key with.  Note that the system defaults for the OEM
	     codepage could have been changed by calling SetConsoleCP
	     or w32-set-console-codepage, so using GetLocaleInfo to
	     get LOCALE_IDEFAULTCODEPAGE is not TRT here.  */
          cpId = GetConsoleCP ();

	  dbcs[0] = dbcs_lead;
	  dbcs[1] = event->uChar.AsciiChar;
	  if (dbcs_lead)
	    {
	      dbcs_lead = 0;
	      if (!MultiByteToWideChar (cpId, 0, dbcs, 2, &code, 1))
		{
		  /* Garbage  */
		  DebPrint (("Invalid DBCS sequence: %d %d\n",
			     dbcs[0], dbcs[1]));
		  emacs_ev->kind = NO_EVENT;
		}
	    }
	  else if (IsDBCSLeadByteEx (cpId, dbcs[1]))
	    {
	      dbcs_lead = dbcs[1];
	      emacs_ev->kind = NO_EVENT;
	    }
	  else
	    {
	      if (!MultiByteToWideChar (cpId, 0, &dbcs[1], 1, &code, 1))
		{
		  /* Garbage  */
		  DebPrint (("Invalid character: %d\n", dbcs[1]));
		  emacs_ev->kind = NO_EVENT;
		}
	    }
	  emacs_ev->kind = MULTIBYTE_CHAR_KEYSTROKE_EVENT;
	  emacs_ev->code = code;
	}
    }
  else
    {
      /* Function keys and other non-character keys.  */
      emacs_ev->kind = NON_ASCII_KEYSTROKE_EVENT;
      emacs_ev->code = event->wVirtualKeyCode;
    }

  XSETFRAME (emacs_ev->frame_or_window, get_frame ());
  emacs_ev->modifiers = w32_kbd_mods_to_emacs (event->dwControlKeyState,
					       event->wVirtualKeyCode);
  emacs_ev->timestamp = GetTickCount ();
  return 1;
}

/* Mouse position hook.  */
void
w32_console_mouse_position (FRAME_PTR *f,
			    int insist,
			    Lisp_Object *bar_window,
			    enum scroll_bar_part *part,
			    Lisp_Object *x,
			    Lisp_Object *y,
			    Time *time)
{
  block_input ();

  insist = insist;

  *f = get_frame ();
  *bar_window = Qnil;
  *part = 0;
  SELECTED_FRAME ()->mouse_moved = 0;

  XSETINT (*x, movement_pos.X);
  XSETINT (*y, movement_pos.Y);
  *time = movement_time;

  unblock_input ();
}

/* Remember mouse motion and notify emacs.  */
static void
mouse_moved_to (int x, int y)
{
  /* If we're in the same place, ignore it.  */
  if (x != movement_pos.X || y != movement_pos.Y)
    {
      SELECTED_FRAME ()->mouse_moved = 1;
      movement_pos.X = x;
      movement_pos.Y = y;
      movement_time = GetTickCount ();
    }
}

/* Consoles return button bits in a strange order:
     least significant - Leftmost button
     next - Rightmost button
     next - Leftmost+1
     next - Leftmost+2...

   Assume emacs likes three button mice, so
     Left == 0
     Middle == 1
     Right == 2
   Others increase from there.  */

#define NUM_TRANSLATED_MOUSE_BUTTONS 3
static int emacs_button_translation[NUM_TRANSLATED_MOUSE_BUTTONS] =
{
  0, 2, 1
};

static int
do_mouse_event (MOUSE_EVENT_RECORD *event,
		struct input_event *emacs_ev)
{
  static DWORD button_state = 0;
  static Lisp_Object last_mouse_window;
  DWORD but_change, mask;
  int i;

  if (event->dwEventFlags == MOUSE_MOVED)
    {
      FRAME_PTR f = SELECTED_FRAME ();
      Mouse_HLInfo *hlinfo = MOUSE_HL_INFO (f);
      int mx = event->dwMousePosition.X, my = event->dwMousePosition.Y;

      mouse_moved_to (mx, my);

      if (f->mouse_moved)
	{
	  if (hlinfo->mouse_face_hidden)
	    {
	      hlinfo->mouse_face_hidden = 0;
	      clear_mouse_face (hlinfo);
	    }

	  /* Generate SELECT_WINDOW_EVENTs when needed.  */
	  if (!NILP (Vmouse_autoselect_window))
	    {
	      Lisp_Object mouse_window = window_from_coordinates (f, mx, my,
								  0, 0);
	      /* A window will be selected only when it is not
		 selected now, and the last mouse movement event was
		 not in it.  A minibuffer window will be selected iff
		 it is active.  */
	      if (WINDOWP (mouse_window)
		  && !EQ (mouse_window, last_mouse_window)
		  && !EQ (mouse_window, selected_window))
		{
		  struct input_event event;

		  EVENT_INIT (event);
		  event.kind = SELECT_WINDOW_EVENT;
		  event.frame_or_window = mouse_window;
		  event.arg = Qnil;
		  event.timestamp = movement_time;
		  kbd_buffer_store_event (&event);
		}
	      last_mouse_window = mouse_window;
	    }
	  else
	    last_mouse_window = Qnil;

	  previous_help_echo_string = help_echo_string;
	  help_echo_string = help_echo_object = help_echo_window = Qnil;
	  help_echo_pos = -1;
	  note_mouse_highlight (f, mx, my);
	  /* If the contents of the global variable help_echo has
	     changed (inside note_mouse_highlight), generate a HELP_EVENT.  */
	  if (!NILP (help_echo_string) || !NILP (previous_help_echo_string))
	    gen_help_event (help_echo_string, selected_frame, help_echo_window,
			    help_echo_object, help_echo_pos);
	}
      return 0;
    }

  /* It looks like the console code sends us a mouse event with
     dwButtonState == 0 when a window is activated.  Ignore this case.  */
  if (event->dwButtonState == button_state)
    return 0;

  emacs_ev->kind = MOUSE_CLICK_EVENT;

  /* Find out what button has changed state since the last button event.  */
  but_change = button_state ^ event->dwButtonState;
  mask = 1;
  for (i = 0; mask; i++, mask <<= 1)
    if (but_change & mask)
      {
        if (i < NUM_TRANSLATED_MOUSE_BUTTONS)
          emacs_ev->code = emacs_button_translation[i];
        else
          emacs_ev->code = i;
	break;
      }

  button_state = event->dwButtonState;
  emacs_ev->timestamp = GetTickCount ();
  emacs_ev->modifiers = w32_kbd_mods_to_emacs (event->dwControlKeyState, 0) |
    ((event->dwButtonState & mask) ? down_modifier : up_modifier);

  XSETFASTINT (emacs_ev->x, event->dwMousePosition.X);
  XSETFASTINT (emacs_ev->y, event->dwMousePosition.Y);
/* for Mule 2.2 (Based on Emacs 19.28 */
#ifdef MULE
  XSET (emacs_ev->frame_or_window, Lisp_Frame, get_frame ());
#else
  XSETFRAME (emacs_ev->frame_or_window, get_frame ());
#endif

  return 1;
}

static void
resize_event (WINDOW_BUFFER_SIZE_RECORD *event)
{
  FRAME_PTR f = get_frame ();

  change_frame_size (f, event->dwSize.Y, event->dwSize.X, 0, 1, 0);
  SET_FRAME_GARBAGED (f);
}

static void
maybe_generate_resize_event (void)
{
  CONSOLE_SCREEN_BUFFER_INFO info;
  FRAME_PTR f = get_frame ();

  GetConsoleScreenBufferInfo (GetStdHandle (STD_OUTPUT_HANDLE), &info);

  /* It is okay to call this unconditionally, since it will do nothing
     if the size hasn't actually changed.  */
  change_frame_size (f,
		     1 + info.srWindow.Bottom - info.srWindow.Top,
		     1 + info.srWindow.Right - info.srWindow.Left,
		     0, 0, 0);
}

static void
handle_file_notifications (struct input_event *hold_quit)
{
  BYTE *p = file_notifications;
  FILE_NOTIFY_INFORMATION *fni = (PFILE_NOTIFY_INFORMATION)p;
  const DWORD min_size
    = offsetof (FILE_NOTIFY_INFORMATION, FileName) + sizeof(wchar_t);
  struct input_event inev;

  /* We cannot process notification before Emacs is fully initialized,
     since we need the UTF-16LE coding-system to be set up.  */
  if (!initialized)
    {
      notification_buffer_in_use = 0;
      return;
    }

  enter_crit ();
  if (notification_buffer_in_use)
    {
      DWORD info_size = notifications_size;

      /* notifications_size could be zero when the buffer of
	 notifications overflowed on the OS level, or when the
	 directory being watched was itself deleted.  Do nothing in
	 that case.  */
      if (info_size)
	{
	  EVENT_INIT (inev);

	  while (info_size >= min_size)
	    {
	      Lisp_Object utf_16_fn
		= make_unibyte_string ((char *)fni->FileName,
				       fni->FileNameLength);
	      /* Note: mule-conf is preloaded, so utf-16le must
		 already be defined at this point.  */
	      Lisp_Object fname
		= code_convert_string_norecord (utf_16_fn,
						intern ("utf-16le"), 0);
	      Lisp_Object action = lispy_file_action (fni->Action);
	      Lisp_Object obj;

	      obj = get_watch_object (make_number (notifications_desc));
	      if (!NILP (obj) && CONSP (obj))
		{
		  inev.kind = FILE_NOTIFY_EVENT;
		  inev.code = (ptrdiff_t)notifications_desc;
		  inev.timestamp = GetTickCount ();
		  inev.modifiers = 0;
		  inev.frame_or_window = XCDR (obj);
		  inev.arg = Fcons (action, fname);
		  kbd_buffer_store_event_hold (&inev, hold_quit);
		}

	      if (!fni->NextEntryOffset)
		break;
	      p += fni->NextEntryOffset;
	      fni = (PFILE_NOTIFY_INFORMATION)p;
	      info_size -= fni->NextEntryOffset;
	    }
	}
      notification_buffer_in_use = 0;
    }
  leave_crit ();
}

int
w32_console_read_socket (struct terminal *terminal,
                         struct input_event *hold_quit)
{
  int nev, add;
  int isdead;

  block_input ();

  for (;;)
    {
      handle_file_notifications (hold_quit);
      nev = fill_queue (0);
      if (nev <= 0)
        {
	  /* If nev == -1, there was some kind of error
	     If nev == 0 then waitp must be zero and no events were available
	     so return.  */
	  break;
        }

      while (nev > 0)
        {
	  struct input_event inev;

	  EVENT_INIT (inev);
	  inev.kind = NO_EVENT;
	  inev.arg = Qnil;

	  switch (queue_ptr->EventType)
            {
            case KEY_EVENT:
	      add = key_event (&queue_ptr->Event.KeyEvent, &inev, &isdead);
	      if (add == -1) /* 95.7.25 by himi */
		{
		  queue_ptr--;
		  add = 1;
		}
	      if (add)
		kbd_buffer_store_event_hold (&inev, hold_quit);
	      break;

            case MOUSE_EVENT:
	      add = do_mouse_event (&queue_ptr->Event.MouseEvent, &inev);
	      if (add)
		kbd_buffer_store_event_hold (&inev, hold_quit);
	      break;

            case WINDOW_BUFFER_SIZE_EVENT:
	      if (w32_use_full_screen_buffer)
		resize_event (&queue_ptr->Event.WindowBufferSizeEvent);
	      break;

            case MENU_EVENT:
            case FOCUS_EVENT:
	      /* Internal event types, ignored. */
	      break;
            }

	  queue_ptr++;
	  nev--;
        }
    }

  /* We don't get told about changes in the window size (only the buffer
     size, which we no longer care about), so we have to check it
     periodically.  */
  if (!w32_use_full_screen_buffer)
    maybe_generate_resize_event ();

  unblock_input ();
  return nev;
}