Extend mouse support on W32 text-mode console.

 src/xdisp.c (draw_row_with_mouse_face): Call
 tty_draw_row_with_mouse_face for WINDOWSNT as well.
 src/w32console.c: Include window.h.
 (w32con_write_glyphs_with_face, tty_draw_row_with_mouse_face): New
 functions.
 (initialize_w32_display): Initialize mouse-highlight data.
 src/w32inevt.c: Include termchar.h and window.h.
 (do_mouse_event): Support mouse-autoselect-window.  When the mouse
 moves, call note_mouse_highlight.  If help_echo changed, call
 gen_help_event to produce help-echo message in the echo area.
 Call clear_mouse_face if mouse_face_hidden is set in the mouse
 highlight info.

 etc/NEWS: Describe the changes.

5 files changed, 167 insertions, 5 deletions

diff --git a/etc/NEWS b/etc/NEWS
index 68744dc9ff5..c216c6be95e 100644
--- a/etc/NEWS
+++ b/etc/NEWS
@@ -313,6 +313,10 @@ by the underlying C implementation.
 *** --without-libxml2 omits support for libxml2, even if its presence
 is detected.
 
+** When invoked with the -nw switch to run on the Windows text-mode terminal,
+Emacs now supports mouse highlight, help-echo (in the echo area), and
+mouse-autoselect-window.
+
 
 * Installation Changes in Emacs 24.1
 
diff --git a/src/ChangeLog b/src/ChangeLog
index 2981e754c8a..c71ea45dded 100644
--- a/src/ChangeLog
+++ b/src/ChangeLog
@@ -1,3 +1,21 @@
+2012-05-26  Eli Zaretskii  <eliz@gnu.org>
+
+        Extend mouse support on W32 text-mode console.
+        * xdisp.c (draw_row_with_mouse_face): Call
+        tty_draw_row_with_mouse_face for WINDOWSNT as well.
+
+        * w32console.c: Include window.h.
+        (w32con_write_glyphs_with_face, tty_draw_row_with_mouse_face): New
+        functions.
+        (initialize_w32_display): Initialize mouse-highlight data.
+
+        * w32inevt.c: Include termchar.h and window.h.
+        (do_mouse_event): Support mouse-autoselect-window.  When the mouse
+        moves, call note_mouse_highlight.  If help_echo changed, call
+        gen_help_event to produce help-echo message in the echo area.
+        Call clear_mouse_face if mouse_face_hidden is set in the mouse
+        highlight info.
+
 2012-05-26  Paul Eggert  <eggert@cs.ucla.edu>
 
         * lread.c (read1): Simplify slightly to avoid an overflow warning
diff --git a/src/w32console.c b/src/w32console.c
index e8b0f621b4f..22f329e239d 100644
--- a/src/w32console.c
+++ b/src/w32console.c
@@ -33,6 +33,7 @@ along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
 #include "coding.h"
 #include "disptab.h"
 #include "frame.h"
+#include "window.h"
 #include "termhooks.h"
 #include "termchar.h"
 #include "dispextern.h"
@@ -339,6 +340,84 @@ w32con_write_glyphs (struct frame *f, register struct glyph *string,
     }
 }
 
+/* Used for mouse highlight.  */
+static void
+w32con_write_glyphs_with_face (struct frame *f, register int x, register int y,
+                               register struct glyph *string, register int len,
+                               register int face_id)
+{
+  unsigned char *conversion_buffer;
+  struct coding_system *coding;
+
+  if (len <= 0)
+    return;
+
+  /* If terminal_coding does any conversion, use it, otherwise use
+     safe_terminal_coding.  We can't use CODING_REQUIRE_ENCODING here
+     because it always return 1 if the member src_multibyte is 1.  */
+  coding = (FRAME_TERMINAL_CODING (f)->common_flags & CODING_REQUIRE_ENCODING_MASK
+            ? FRAME_TERMINAL_CODING (f) : &safe_terminal_coding);
+  /* We are going to write the entire block of glyphs in one go, as
+     they all have the same face.  So this _is_ the last block.  */
+  coding->mode |= CODING_MODE_LAST_BLOCK;
+
+  conversion_buffer = encode_terminal_code (string, len, coding);
+  if (coding->produced > 0)
+    {
+      DWORD filled, written;
+      /* Compute the character attributes corresponding to the face.  */
+      DWORD char_attr = w32_face_attributes (f, face_id);
+      COORD start_coords;
+
+      start_coords.X = x;
+      start_coords.Y = y;
+      /* Set the attribute for these characters.  */
+      if (!FillConsoleOutputAttribute (cur_screen, char_attr,
+                                       coding->produced, start_coords,
+                                       &filled))
+        DebPrint (("Failed writing console attributes: %d\n", GetLastError ()));
+      else
+        {
+          /* Write the characters.  */
+          if (!WriteConsoleOutputCharacter (cur_screen, conversion_buffer,
+                                            filled, start_coords, &written))
+            DebPrint (("Failed writing console characters: %d\n",
+                       GetLastError ()));
+        }
+    }
+}
+
+/* Implementation of draw_row_with_mouse_face for W32 console.  */
+void
+tty_draw_row_with_mouse_face (struct window *w, struct glyph_row *row,
+                              int start_hpos, int end_hpos,
+                              enum draw_glyphs_face draw)
+{
+  int nglyphs = end_hpos - start_hpos;
+  struct frame *f = XFRAME (WINDOW_FRAME (w));
+  struct tty_display_info *tty = FRAME_TTY (f);
+  int face_id = tty->mouse_highlight.mouse_face_face_id;
+  int pos_x, pos_y;
+
+  if (end_hpos >= row->used[TEXT_AREA])
+    nglyphs = row->used[TEXT_AREA] - start_hpos;
+
+  pos_y = row->y + WINDOW_TOP_EDGE_Y (w);
+  pos_x = row->used[LEFT_MARGIN_AREA] + start_hpos + WINDOW_LEFT_EDGE_X (w);
+
+  if (draw == DRAW_MOUSE_FACE)
+    w32con_write_glyphs_with_face (f, pos_x, pos_y,
+                                   row->glyphs[TEXT_AREA] + start_hpos,
+                                   nglyphs, face_id);
+  else if (draw == DRAW_NORMAL_TEXT)
+    {
+      COORD save_coords = cursor_coords;
+
+      w32con_move_cursor (f, pos_y, pos_x);
+      write_glyphs (f, row->glyphs[TEXT_AREA] + start_hpos, nglyphs);
+      w32con_move_cursor (f, save_coords.Y, save_coords.X);
+    }
+}
 
 static void
 w32con_delete_glyphs (struct frame *f, int n)
@@ -570,6 +649,7 @@ void
 initialize_w32_display (struct terminal *term)
 {
   CONSOLE_SCREEN_BUFFER_INFO    info;
+  Mouse_HLInfo *hlinfo;
 
   term->rif = 0; /* No window based redisplay on the console.  */
   term->cursor_to_hook          = w32con_move_cursor;
@@ -600,6 +680,15 @@ initialize_w32_display (struct terminal *term)
   term->judge_scroll_bars_hook = 0;
   term->frame_up_to_date_hook = 0;
 
+  /* Initialize the mouse-highlight data.  */
+  hlinfo = &term->display_info.tty->mouse_highlight;
+  hlinfo->mouse_face_beg_row = hlinfo->mouse_face_beg_col = -1;
+  hlinfo->mouse_face_end_row = hlinfo->mouse_face_end_col = -1;
+  hlinfo->mouse_face_face_id = DEFAULT_FACE_ID;
+  hlinfo->mouse_face_mouse_frame = NULL;
+  hlinfo->mouse_face_window = Qnil;
+  hlinfo->mouse_face_hidden = 0;
+
   /* Initialize interrupt_handle.  */
   init_crit ();
 
diff --git a/src/w32inevt.c b/src/w32inevt.c
index e7a8bf629d6..a85fdbbe435 100644
--- a/src/w32inevt.c
+++ b/src/w32inevt.c
@@ -35,8 +35,10 @@ along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
 #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"
 
@@ -566,7 +568,7 @@ w32_console_mouse_position (FRAME_PTR *f,
 static void
 mouse_moved_to (int x, int y)
 {
-  /* If we're in the same place, ignore it */
+  /* If we're in the same place, ignore it.  */
   if (x != movement_pos.X || y != movement_pos.Y)
     {
       SELECTED_FRAME ()->mouse_moved = 1;
@@ -599,14 +601,63 @@ 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)
     {
-      /* For movement events we just note that the mouse has moved
-         so that emacs will generate drag events.  */
-      mouse_moved_to (event->dwMousePosition.X, event->dwMousePosition.Y);
+      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;
     }
 
diff --git a/src/xdisp.c b/src/xdisp.c
index 0a25eab1cbc..794355af153 100644
--- a/src/xdisp.c
+++ b/src/xdisp.c
@@ -25832,7 +25832,7 @@ draw_row_with_mouse_face (struct window *w, int start_x, struct glyph_row *row,
       return;
     }
 #endif
-#if defined (HAVE_GPM) || defined (MSDOS)
+#if defined (HAVE_GPM) || defined (MSDOS) || defined (WINDOWSNT)
   tty_draw_row_with_mouse_face (w, row, start_hpos, end_hpos, draw);
 #endif
 }