Hi Folks!
IMHO the idea behind the grab/mouse hide was to
have relative mouse moves inside the window when
the mouse is grabbed ...
now the SDL documentation SDL_MouseMotionEvent(3)
says the following:
If the cursor is hidden (SDL_ShowCursor(0)) and the
input is grabbed (SDL_WM_GrabInput(SDL_GRAB_ON)),
then the mouse will give relative motion events
even when the cursor reaches the edge fo the screen.
which is almost met, except for qemu _not_ using
the SDL_ShowCursor() but instead doing a special
SDL_SetCursor(sdl_cursor_hidden), which results in
SDL _not_ transmitting the relative motion events
once the border is reached, which in turn gives
funny behaviour :)
the following patch fixes this:
diff -NurpP qemu-cvs20060522/sdl.c qemu-cvs20060522/sdl.c
--- qemu-cvs20060522/sdl.c 2006-05-23 01:18:33.000000000 +0200
+++ qemu-cvs20060522/sdl.c 2006-05-23 03:03:19.000000000 +0200
@@ -285,13 +285,13 @@ static void sdl_update_caption(void)
static void sdl_hide_cursor(void)
{
- SDL_SetCursor(sdl_cursor_hidden);
+ SDL_ShowCursor(0);
}
static void sdl_show_cursor(void)
{
if (!kbd_mouse_is_absolute()) {
- SDL_SetCursor(sdl_cursor_normal);
+ SDL_ShowCursor(1);
}
}
best,
Herbert
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