Commit 3ad99c46 authored by Eli Zaretskii's avatar Eli Zaretskii

Avoid leaving "ghost" of mouse pointer on MS-Windows

* src/w32term.c (frame_set_mouse_pixel_position):
* src/w32fns.c (Fw32_mouse_absolute_pixel_position): Momentarily
disable "mouse trails" when moving the mouse pointer.  (Bug#22247)
* src/w32term.c (frame_set_mouse_pixel_position): Include
w32common.h.
parent f9d87dd8
......@@ -8093,11 +8093,22 @@ The coordinates X and Y are interpreted in pixels relative to a position
(0, 0) of the selected frame's display. */)
(Lisp_Object x, Lisp_Object y)
{
UINT trail_num = 0;
BOOL ret = false;
CHECK_TYPE_RANGED_INTEGER (int, x);
CHECK_TYPE_RANGED_INTEGER (int, y);
block_input ();
/* When "mouse trails" are in effect, moving the mouse cursor
sometimes leaves behind an annoying "ghost" of the pointer.
Avoid that by momentarily switching off mouse trails. */
if (os_subtype == OS_NT
&& w32_major_version + w32_minor_version >= 6)
ret = SystemParametersInfo (SPI_GETMOUSETRAILS, 0, &trail_num, 0);
SetCursorPos (XINT (x), XINT (y));
if (ret)
SystemParametersInfo (SPI_SETMOUSETRAILS, trail_num, NULL, 0);
unblock_input ();
return Qnil;
......
......@@ -23,6 +23,7 @@ along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>. */
#include "lisp.h"
#include "blockinput.h"
#include "w32term.h"
#include "w32common.h" /* for OS version info */
#include <ctype.h>
#include <errno.h>
......@@ -6237,6 +6238,8 @@ x_set_window_size (struct frame *f, bool change_gravity,
void
frame_set_mouse_pixel_position (struct frame *f, int pix_x, int pix_y)
{
UINT trail_num = 0;
BOOL ret = false;
RECT rect;
POINT pt;
......@@ -6247,7 +6250,15 @@ frame_set_mouse_pixel_position (struct frame *f, int pix_x, int pix_y)
pt.y = rect.top + pix_y;
ClientToScreen (FRAME_W32_WINDOW (f), &pt);
/* When "mouse trails" are in effect, moving the mouse cursor
sometimes leaves behind an annoying "ghost" of the pointer.
Avoid that by momentarily switching off mouse trails. */
if (os_subtype == OS_NT
&& w32_major_version + w32_minor_version >= 6)
ret = SystemParametersInfo (SPI_GETMOUSETRAILS, 0, &trail_num, 0);
SetCursorPos (pt.x, pt.y);
if (ret)
SystemParametersInfo (SPI_SETMOUSETRAILS, trail_num, NULL, 0);
unblock_input ();
}
......
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