(kbd_buffer_get_event) [WINDOWSNT]: Support

menu_bar_activate_event.
(set-input-mode) [DOS_NT]: Do not invoke reset and init sys modes.
(Qmouse_wheel) [WINDOWSNT]: New variable.
(discard_mouse_events): New function.
(mouse_wheel_syms) [WINDOWSNT]: New variable.
(lispy_mouse_wheel_names) [WINDOWSNT]: New variable.
(make_lispy_event) [WINDOWSNT]: Make mouse-wheel events.
(syms_of_keyboard) [WINDOWSNT]: Define Qmouse_wheel and
mouse_wheel_syms.

src/keyboard.c

@@ -444,6 +444,9 @@ Lisp_Object Qmake_frame_visible;
 /* Symbols to denote kinds of events.  */
 Lisp_Object Qfunction_key;
 Lisp_Object Qmouse_click;
+#ifdef WINDOWSNT
+Lisp_Object Qmouse_wheel;
+#endif
 /* Lisp_Object Qmouse_movement; - also an event header */
 
 /* Properties of event headers.  */
@@ -2629,6 +2632,28 @@ kbd_buffer_store_event (event)
     }
 }
 
+/* Discard any mouse events in the event buffer by setting them to
+   no_event.  */
+void
+discard_mouse_events ()
+{
+  struct input_event *sp;
+  for (sp = kbd_fetch_ptr; sp != kbd_store_ptr; sp++)
+    {
+      if (sp == kbd_buffer + KBD_BUFFER_SIZE)
+	sp = kbd_buffer;
+
+      if (sp->kind == mouse_click
+#ifdef WINDOWSNT
+	  || sp->kind == w32_scroll_bar_click
+#endif
+	  || sp->kind == scroll_bar_click)
+	{
+	  sp->kind = no_event;
+	}
+    }
+}
+
 /* Read one event from the event buffer, waiting if necessary.
    The value is a Lisp object representing the event.
    The value is nil for an event that should be ignored,
@@ -2795,7 +2820,7 @@ kbd_buffer_get_event (kbp, used_mouse_menu)
 	  XSETBUFFER (obj, current_buffer);
 	  kbd_fetch_ptr = event + 1;
 	}
-#ifdef USE_X_TOOLKIT
+#if defined (USE_X_TOOLKIT) || defined (HAVE_NTGUI)
       else if (event->kind == menu_bar_activate_event)
 	{
 	  kbd_fetch_ptr = event + 1;
@@ -2810,6 +2835,8 @@ kbd_buffer_get_event (kbp, used_mouse_menu)
 	 (They shouldn't otherwise be found in the buffer,
 	 but on some machines it appears they do show up
 	 even without MULTI_KBOARD.)  */
+      /* On Windows NT/9X, no_event is used to delete extraneous
+         mouse events during a popup-menu call.  */
       else if (event->kind == no_event)
 	kbd_fetch_ptr = event + 1;
 
@@ -3220,6 +3247,9 @@ timer_check (do_it_now)
 static Lisp_Object accent_key_syms;
 static Lisp_Object func_key_syms;
 static Lisp_Object mouse_syms;
+#ifdef WINDOWSNT
+static Lisp_Object mouse_wheel_syms;
+#endif
 
 /* This is a list of keysym codes for special "accent" characters.
    It parallels lispy_accent_keys.  */
@@ -3639,6 +3669,20 @@ static char *lispy_mouse_names[] =
   "mouse-1", "mouse-2", "mouse-3", "mouse-4", "mouse-5"
 };
 
+#ifdef WINDOWSNT
+/* mouse-wheel events are generated by the wheel on devices such as
+   the MS Intellimouse.  The wheel sits in between the left and right
+   mouse buttons, and is typically used to scroll or zoom the window
+   underneath the pointer.  mouse-wheel events specify the object on
+   which they operate, and a delta corresponding to the amount and
+   direction that the wheel is rotated.  Clicking the mouse-wheel
+   generates a mouse-2 event.  */
+static char *lispy_mouse_wheel_names[] = 
+{
+  "mouse-wheel"
+};
+#endif /* WINDOWSNT */
+
 /* Scroll bar parts.  */
 Lisp_Object Qabove_handle, Qhandle, Qbelow_handle;
 Lisp_Object Qup, Qdown;
@@ -4069,8 +4113,68 @@ make_lispy_event (event)
 			       Qnil));
 	}
       }
-#endif
+    case mouse_wheel:
+      {
+	int part;
+	FRAME_PTR f = XFRAME (event->frame_or_window);
+	Lisp_Object window;
+	Lisp_Object posn;
+	Lisp_Object head, position;
+	int row, column;
+
+	/* Ignore mouse events that were made on frame that
+	   have been deleted.  */
+	if (! FRAME_LIVE_P (f))
+	  return Qnil;
+	pixel_to_glyph_coords (f, XINT (event->x), XINT (event->y),
+			       &column, &row, NULL, 1);
+	window = window_from_coordinates (f, column, row, &part);
+
+	if (!WINDOWP (window))
+	  {
+	    window = event->frame_or_window;
+	    posn = Qnil;
+	  }
+	else
+	  {
+	    int pixcolumn, pixrow;
+	    column -= XINT (XWINDOW (window)->left);
+	    row -= XINT (XWINDOW (window)->top);
+	    glyph_to_pixel_coords (f, column, row, &pixcolumn, &pixrow);
+	    XSETINT (event->x, pixcolumn);
+	    XSETINT (event->y, pixrow);
+
+	    if (part == 1)
+	      posn = Qmode_line;
+	    else if (part == 2)
+	      posn = Qvertical_line;
+	    else
+	      XSETINT (posn,
+		       buffer_posn_from_coords (XWINDOW (window),
+						column, row));
+	  }
 
+	{
+	  Lisp_Object head, position;
+
+	  position
+	    = Fcons (window,
+		     Fcons (posn,
+			    Fcons (Fcons (event->x, event->y),
+				   Fcons (make_number (event->timestamp),
+					  Qnil))));
+
+	  head = modify_event_symbol (0, event->modifiers,
+				      Qmouse_wheel, Qnil,
+				      lispy_mouse_wheel_names,
+				      &mouse_wheel_syms, 1);
+	  return Fcons (head,
+			Fcons (position,
+			       Fcons (make_number (event->code),
+				      Qnil)));
+	}
+      }
+#endif /* WINDOWSNT */
 #endif /* HAVE_MOUSE */
 
 #if defined (USE_X_TOOLKIT) || defined (HAVE_NTGUI)
@@ -7704,7 +7808,7 @@ See also `current-input-mode'.")
   stop_polling ();
 #endif
 
-#ifndef MSDOS
+#ifndef DOS_NT
   /* this causes startup screen to be restored and messes with the mouse */
   reset_sys_modes ();
 #endif
@@ -7743,7 +7847,7 @@ See also `current-input-mode'.")
     /* Don't let this value be out of range.  */
     quit_char = XINT (quit) & (meta_key ? 0377 : 0177);
 
-#ifndef MSDOS
+#ifndef DOS_NT
   init_sys_modes ();
 #endif
 
@@ -7970,6 +8074,10 @@ syms_of_keyboard ()
   staticpro (&Qfunction_key);
   Qmouse_click = intern ("mouse-click");
   staticpro (&Qmouse_click);
+#ifdef WINDOWSNT
+  Qmouse_wheel = intern ("mouse-wheel");
+  staticpro (&Qmouse_wheel);
+#endif
 
   Qmenu_enable = intern ("menu-enable");
   staticpro (&Qmenu_enable);
@@ -8062,6 +8170,11 @@ syms_of_keyboard ()
   mouse_syms = Qnil;
   staticpro (&mouse_syms);
 
+#ifdef WINDOWSNT
+  mouse_wheel_syms = Qnil;
+  staticpro (&mouse_wheel_syms);
+#endif
+
   unread_switch_frame = Qnil;
   staticpro (&unread_switch_frame);