(event_kind) [WINDOWSNT]: New event type: mouse_wheel.

1 files changed, 18 insertions, 0 deletions

diff --git a/src/termhooks.h b/src/termhooks.h
index 984c4284ec1..431b183f8df 100644
--- a/src/termhooks.h
+++ b/src/termhooks.h
@@ -234,6 +234,23 @@ enum event_kind
                                    the mouse click occurred in.
                                    .timestamp gives a timestamp (in
                                    milliseconds) for the click.  */
+#ifdef WINDOWSNT
+  mouse_wheel,                  /* A mouse-wheel event is generated by a 
+                                   wheel on a mouse (e.g., MS Intellimouse).
+                                   The event contains a delta that corresponds
+                                   to the amount and direction that the wheel
+                                   is rotated.  This delta is typically
+                                   used to implement a scroll or zoom.
+                                   .code gives the delta.
+                                   .modifiers holds the state of the
+                                   modifier keys.
+                                   .x and .y give the mouse position,
+                                   in characters, within the window.
+                                   .frame_or_window gives the frame
+                                   the wheel event occurred in.
+                                   .timestamp gives a timestamp (in
+                                   milliseconds) for the wheel event.  */
+#endif
   scroll_bar_click,             /* .code gives the number of the mouse button
                                    that was clicked.
                                    .modifiers holds the state of the modifier
@@ -284,6 +301,7 @@ struct input_event
   /* For an ascii_keystroke, this is the character.
      For a non_ascii_keystroke, this is the keysym code.
      For a mouse event, this is the button number.  */
+  /* In WindowsNT, for a mouse wheel event, this is the delta.  */
   int code;
   enum scroll_bar_part part;