* NEWS: explain new behavior and arguments of `key-binding' and

`command-remapping'.

* keymaps.texi (Active Keymaps): Adapt description to use
`get-char-property' instead `get-text-property'.  Explain how
mouse events change this.  Explain the new optional argument of
`key-binding' and its mouse-dependent lookup.
(Searching Keymaps): Adapt description similarly.  Explain the new
optional argument of `command-remapping'.

* Makefile.in (keymap.o): Add "keymap.h" and "window.h"
dependencies.

* keymap.c: include "window.h".
(Fcommand_remapping): New optional POSITION argument.
(Fkey_binding): New optional POSITION argument.  Completely rework
handling of mouse clicks to get the same order of keymaps as
`read-key-sequence' and heed POSITION.  Also temporarily switch
buffers to location of mouse click and back.

* keyboard.c (command_loop_1): Adjust call of `Fcommand_remapping'
for additional argument.
(parse_menu_item): Adjust call of `Fkey_binding' for additional
argument.
(read_key_sequence): If there are both `local-map' and `keymap'
text properties at some buffer position, heed both.

* keymap.h: Declare additional optional arguments of
`Fcommand_remapping' and `Fkey_binding'.

1 files changed, 146 insertions, 47 deletions

diff --git a/src/keymap.c b/src/keymap.c
index 8b99231a91d..45bcba9a5fc 100644
--- a/src/keymap.c
+++ b/src/keymap.c
@@ -33,6 +33,7 @@ Boston, MA 02110-1301, USA.  */
 #include "puresize.h"
 #include "intervals.h"
 #include "keymap.h"
+#include "window.h"
 
 /* The number of elements in keymap vectors.  */
 #define DENSE_TABLE_SIZE (0200)
@@ -1216,17 +1217,23 @@ binding KEY to DEF is added at the front of KEYMAP.  */)
 
 /* This function may GC (it calls Fkey_binding).  */
 
-DEFUN ("command-remapping", Fcommand_remapping, Scommand_remapping, 1, 1, 0,
+DEFUN ("command-remapping", Fcommand_remapping, Scommand_remapping, 1, 2, 0,
        doc: /* Return the remapping for command COMMAND in current keymaps.
-Returns nil if COMMAND is not remapped (or not a symbol).  */)
-     (command)
-     Lisp_Object command;
+Returns nil if COMMAND is not remapped (or not a symbol).
+
+If the optional argument POSITION is non-nil, it specifies a mouse
+position as returned by `event-start' and `event-end', and the
+remapping occurs in the keymaps associated with it.  It can also be a
+number or marker, in which case the keymap properties at the specified
+buffer position instead of point are used. */)
+     (command, position)
+     Lisp_Object command, position;
 {
   if (!SYMBOLP (command))
     return Qnil;
 
   ASET (command_remapping_vector, 1, command);
-  return Fkey_binding (command_remapping_vector, Qnil, Qt);
+  return Fkey_binding (command_remapping_vector, Qnil, Qt, position);
 }
 
 /* Value is number if KEY is too long; nil if valid but has no definition. */
@@ -1552,7 +1559,7 @@ OLP if non-nil indicates that we should obey `overriding-local-map' and
 
 /* GC is possible in this function if it autoloads a keymap.  */
 
-DEFUN ("key-binding", Fkey_binding, Skey_binding, 1, 3, 0,
+DEFUN ("key-binding", Fkey_binding, Skey_binding, 1, 4, 0,
        doc: /* Return the binding for command KEY in current keymaps.
 KEY is a string or vector, a sequence of keystrokes.
 The binding is probably a symbol with a function definition.
@@ -1566,55 +1573,86 @@ recognize the default bindings, just as `read-key-sequence' does.
 Like the normal command loop, `key-binding' will remap the command
 resulting from looking up KEY by looking up the command in the
 current keymaps.  However, if the optional third argument NO-REMAP
-is non-nil, `key-binding' returns the unmapped command.  */)
-     (key, accept_default, no_remap)
-     Lisp_Object key, accept_default, no_remap;
+is non-nil, `key-binding' returns the unmapped command.
+
+If KEY is a key sequence initiated with the mouse, the used keymaps
+will depend on the clicked mouse position with regard to the buffer
+and possible local keymaps on strings.
+
+If the optional argument POSITION is non-nil, it specifies a mouse
+position as returned by `event-start' and `event-end', and the lookup
+occurs in the keymaps associated with it instead of KEY.  It can also
+be a number or marker, in which case the keymap properties at the
+specified buffer position instead of point are used.
+  */)
+    (key, accept_default, no_remap, position)
+    Lisp_Object key, accept_default, no_remap, position;
 {
   Lisp_Object *maps, value;
   int nmaps, i;
-  struct gcpro gcpro1;
+  struct gcpro gcpro1, gcpro2;
+  int count = SPECPDL_INDEX ();
 
-  GCPRO1 (key);
+  GCPRO2 (key, position);
 
-#ifdef HAVE_MOUSE
-  if (VECTORP (key) && ASIZE (key) > 0)
+  if (NILP (position))
     {
-      Lisp_Object ev, pos;
-      if ((ev = AREF (key, 0), CONSP (ev))
-          && SYMBOLP (XCAR (ev))
-          && CONSP (XCDR (ev))
-          && (pos = XCAR (XCDR (ev)), CONSP (pos))
-          && XINT (Flength (pos)) == 10
-          && INTEGERP (XCAR (XCDR (pos))))
-        {
-          Lisp_Object map, object;
+      Lisp_Object event;
+      /* mouse events may have a symbolic prefix indicating the
+         scrollbar or mode line */
+      if (SYMBOLP (AREF (key, 0)) && ASIZE (key) > 1)
+        event = AREF (key, 1);
+      else
+        event = AREF (key, 0);
 
-          object = Fnth (make_number(4), pos);
+      /* We are not interested in locations without event data */
 
-          if (CONSP (object))
-            map = Fget_char_property (XCDR (object), Qkeymap, XCAR (object));
-          else
-            map = Fget_char_property (XCAR (XCDR (pos)), Qkeymap,
-                                      Fwindow_buffer (XCAR (pos)));
+      if (EVENT_HAS_PARAMETERS (event)) {
+        Lisp_Object kind;
 
-          if (!NILP (Fkeymapp (map)))
-            {
-              value = Flookup_key (map, key, accept_default);
-              if (! NILP (value) && !INTEGERP (value))
-                goto done;
-            }
-        }
+        kind = EVENT_HEAD_KIND (EVENT_HEAD (event));
+        if (EQ (kind, Qmouse_click))
+          position = EVENT_START (event);
+      }
     }
-#endif /* HAVE_MOUSE  */
 
-  if (!NILP (current_kboard->Voverriding_terminal_local_map))
+  /* Key sequences beginning with mouse clicks
+     are read using the keymaps of the buffer clicked on, not
+     the current buffer.  So we may have to switch the buffer
+     here. */
+  
+  if (CONSP (position))
+    {
+      Lisp_Object window;
+      
+      window = POSN_WINDOW (position);
+          
+      if (WINDOWP (window)
+          && BUFFERP (XWINDOW (window)->buffer)
+          && XBUFFER (XWINDOW (window)->buffer) != current_buffer)
+        {
+          /* Arrange to go back to the original buffer once we're done
+             processing the key sequence.  We don't use
+             save_excursion_{save,restore} here, in analogy to
+             `read-key-sequence' to avoid saving point.  Maybe this
+             would not be a problem here, but it is easier to keep
+             things the same.
+          */
+              
+          record_unwind_protect (Fset_buffer, Fcurrent_buffer ());
+          
+          set_buffer_internal (XBUFFER (XWINDOW (window)->buffer));
+        }
+    }
+  
+  if (! NILP (current_kboard->Voverriding_terminal_local_map))
     {
       value = Flookup_key (current_kboard->Voverriding_terminal_local_map,
                            key, accept_default);
       if (! NILP (value) && !INTEGERP (value))
         goto done;
     }
-  else if (!NILP (Voverriding_local_map))
+  else if (! NILP (Voverriding_local_map))
     {
       value = Flookup_key (Voverriding_local_map, key, accept_default);
       if (! NILP (value) && !INTEGERP (value))
@@ -1622,12 +1660,72 @@ is non-nil, `key-binding' returns the unmapped command.  */)
     }
   else
     {
-      Lisp_Object local;
+      Lisp_Object keymap, local_map;
+      EMACS_INT pt;
 
-      local = get_local_map (PT, current_buffer, Qkeymap);
-      if (! NILP (local))
+      pt = INTEGERP (position) ? XINT (position)
+        : MARKERP (position) ? marker_position (position)
+        : PT;
+
+      local_map = get_local_map (pt, current_buffer, Qlocal_map); 
+      keymap = get_local_map (pt, current_buffer, Qkeymap); 
+
+      if (CONSP (position))
         {
-          value = Flookup_key (local, key, accept_default);
+          Lisp_Object string, window;
+
+          window = POSN_WINDOW (position);
+
+          /* For a mouse click, get the local text-property keymap
+             of the place clicked on, rather than point.  */
+          
+          if (POSN_INBUFFER_P (position))
+            {
+              Lisp_Object pos;
+
+              pos = POSN_BUFFER_POSN (position);
+              if (INTEGERP (pos)
+                  && XINT (pos) >= BEG && XINT (pos) <= Z)
+                {
+                  local_map = get_local_map (XINT (pos),
+                                             current_buffer, Qlocal_map);
+                  
+                  keymap = get_local_map (XINT (pos),
+                                          current_buffer, Qkeymap);
+                }
+            }
+
+          /* If on a mode line string with a local keymap,
+             or for a click on a string, i.e. overlay string or a
+             string displayed via the `display' property,
+             consider `local-map' and `keymap' properties of
+             that string.  */
+          
+          if (string = POSN_STRING (position),
+              (CONSP (string) && STRINGP (XCAR (string))))
+            {
+              Lisp_Object pos, map;
+              
+              pos = XCDR (string);
+              string = XCAR (string);
+              if (XINT (pos) >= 0
+                  && XINT (pos) < SCHARS (string))
+                {
+                  map = Fget_text_property (pos, Qlocal_map, string);
+                  if (!NILP (map))
+                    local_map = map;
+
+                  map = Fget_text_property (pos, Qkeymap, string);
+                  if (!NILP (map))
+                    keymap = map;
+                }
+            }
+          
+        }
+
+      if (! NILP (keymap))
+        {
+          value = Flookup_key (keymap, key, accept_default);
           if (! NILP (value) && !INTEGERP (value))
             goto done;
         }
@@ -1644,10 +1742,9 @@ is non-nil, `key-binding' returns the unmapped command.  */)
               goto done;
           }
 
-      local = get_local_map (PT, current_buffer, Qlocal_map);
-      if (! NILP (local))
+      if (! NILP (local_map))
         {
-          value = Flookup_key (local, key, accept_default);
+          value = Flookup_key (local_map, key, accept_default);
           if (! NILP (value) && !INTEGERP (value))
             goto done;
         }
@@ -1656,6 +1753,8 @@ is non-nil, `key-binding' returns the unmapped command.  */)
   value = Flookup_key (current_global_map, key, accept_default);
 
  done:
+  unbind_to (count, Qnil);
+
   UNGCPRO;
   if (NILP (value) || INTEGERP (value))
     return Qnil;
@@ -1666,7 +1765,7 @@ is non-nil, `key-binding' returns the unmapped command.  */)
   if (NILP (no_remap) && SYMBOLP (value))
     {
       Lisp_Object value1;
-      if (value1 = Fcommand_remapping (value), !NILP (value1))
+      if (value1 = Fcommand_remapping (value, position), !NILP (value1))
         value = value1;
     }
 
@@ -2467,7 +2566,7 @@ where_is_internal (definition, keymaps, firstonly, noindirect, no_remap)
   if (NILP (no_remap) && SYMBOLP (definition))
     {
       Lisp_Object tem;
-      if (tem = Fcommand_remapping (definition), !NILP (tem))
+      if (tem = Fcommand_remapping (definition, Qnil), !NILP (tem))
         return Qnil;
     }