/** Can we currently send absolute events to the guest? */
bool Mouse::supportsAbs(void)
{
bool fAbsDev;
getDeviceCaps(&fAbsDev, NULL);
return fAbsDev || vmmdevCanAbs();
}
/**
* Send an absolute pointer event to a pointing device (the VMM device if
* possible or whatever emulated absolute device seems best to us if not).
*
* @returns COM status code
*/
HRESULT Mouse::reportAbsEvent(int32_t x, int32_t y,
int32_t dz, int32_t dw, uint32_t fButtons,
bool fUsesVMMDevEvent)
{
HRESULT rc = S_OK;
/** If we are using the VMMDev to report absolute position but without
* VMMDev IRQ support then we need to send a small "jiggle" to the emulated
* relative mouse device to alert the guest to changes. */
LONG cJiggle = 0;
/*
* Send the absolute mouse position to the device.
*/
if (x != mcLastX || y != mcLastY)
{
if (vmmdevCanAbs())
{
rc = reportAbsEventToVMMDev(x, y);
cJiggle = !fUsesVMMDevEvent;
}
else
{
rc = reportAbsEventToMouseDev(x, y, 0, 0, fButtons);
fButtons = 0;
}
}
if (SUCCEEDED(rc))
rc = reportRelEventToMouseDev(cJiggle, 0, dz, dw, fButtons);
mcLastX = x;
mcLastY = y;
return rc;
}
/**
* Send an absolute pointer event to a pointing device (the VMM device if
* possible or whatever emulated absolute device seems best to us if not).
*
* @returns COM status code
*/
HRESULT Mouse::reportAbsEvent(int32_t mouseXAbs, int32_t mouseYAbs,
int32_t dz, int32_t dw, uint32_t fButtons,
bool fUsesVMMDevEvent)
{
HRESULT rc;
/** If we are using the VMMDev to report absolute position but without
* VMMDev IRQ support then we need to send a small "jiggle" to the emulated
* relative mouse device to alert the guest to changes. */
LONG cJiggle = 0;
if (vmmdevCanAbs())
{
/*
* Send the absolute mouse position to the VMM device.
*/
if (mouseXAbs != mcLastAbsX || mouseYAbs != mcLastAbsY)
{
rc = reportAbsEventToVMMDev(mouseXAbs, mouseYAbs);
cJiggle = !fUsesVMMDevEvent;
}
rc = reportRelEventToMouseDev(cJiggle, 0, dz, dw, fButtons);
}
else
rc = reportAbsEventToMouseDev(mouseXAbs, mouseYAbs, dz, dw, fButtons);
mcLastAbsX = mouseXAbs;
mcLastAbsY = mouseYAbs;
return rc;
}