internal bool HandleTabletAdded(uint wisptisIndex, ref uint tabletIndexChanged)
{
if (_tablets == null)
{
throw new ObjectDisposedException("TabletDeviceCollection");
}
tabletIndexChanged = UInt32.MaxValue;
// REENTRANCY NOTE: Let a PenThread do this work to avoid reentrancy!
// On return you get the tablet info needed to
// create a tablet devices (and stylus device info gets
// cached in penimc too which avoids calls to wisptis.exe).
// Use existing penthread if we have one otherwise grab an available one.
PenThread penThread = _tablets.Length > 0 ? _tablets[0].As <WispTabletDevice>().PenThread :
PenThreadPool.GetPenThreadForPenContext(null);
// There was an error acquiring a PenThread, return true to force a complete tablet refresh
if (penThread == null)
{
Debug.Assert(false, "Error acquiring PenThread in HandleTabletAdded()");
return(true);
}
TabletDeviceInfo tabletInfo = penThread.WorkerGetTabletInfo(wisptisIndex);
// If we failed due to a COM exception on the pen thread then return
if (tabletInfo.PimcTablet == null)
{
return(true); // make sure we rebuild our tablet collection. (return true + MaxValue).
}
// if mouse tabletdevice then ignore it.
if (tabletInfo.DeviceType == (TabletDeviceType)(-1))
{
_indexMouseTablet = wisptisIndex; // update index.
return(false); // TabletDevices did not change.
}
// Now see if this is a duplicate add call we want to filter out (ie - already added to tablet collection).
uint indexFound = UInt32.MaxValue;
for (uint i = 0; i < _tablets.Length; i++)
{
// If it is the mouse tablet device we want to ignore it.
if (_tablets[i].Id == tabletInfo.Id)
{
indexFound = i;
break;
}
}
// We only want to add this if it is not currently in the collection. Wisptis will send
// us duplicate adds at times so this is a work around for that issue.
uint tabletIndex = UInt32.MaxValue;
if (indexFound == UInt32.MaxValue)
{
tabletIndex = wisptisIndex;
if (tabletIndex > _indexMouseTablet)
{
tabletIndex--;
}
else
{
_indexMouseTablet++;
}
// if index is out of range then ignore it. Return of MaxValue causes a rebuild of the devices.
if (tabletIndex <= _tablets.Length)
{
try
{
// Add new tablet at end of collection
AddTablet(tabletIndex, new TabletDevice(new WispTabletDevice(tabletInfo, penThread)));
}
catch (InvalidOperationException ex)
{
// This is caused by the Stylus ID not being unique when trying
// to register it in the StylusLogic.__stylusDeviceMap. If we
// come across a dup then we should rebuild the tablet device collection.
// There seems to be an issue in wisptis where different tablet IDs get
// duplicate Stylus Ids when installing the VHID test devices.
if (ex.Data.Contains("System.Windows.Input.StylusLogic"))
{
return(true); // trigger the tabletdevices to be rebuilt.
}
else
{
throw; // not an expected exception, rethrow it.
}
}
tabletIndexChanged = tabletIndex;
return(true);
}
else
{
return(true); // bogus index. Return true so that the caller can rebuild the collection.
}
}
else
{
return(false); // We found this tablet device already. Don't do anything.
}
}
void UpdateTabletsImpl()
{
// REENTRANCY NOTE: Let a PenThread do this work to avoid reentrancy!
// On return you get entire list of tablet and info needed to
// create all the tablet devices (and stylus device info gets
// cached too in penimc which avoids calls to wisptis.exe).
// Use existing penthread if we have one otherwise grab an available one.
PenThread penThread = _tablets.Length > 0 ? _tablets[0].As <WispTabletDevice>().PenThread :
PenThreadPool.GetPenThreadForPenContext(null);
// There was an error acquiring a PenThread, do no work here.
if (penThread == null)
{
Debug.Assert(false, "Error acquiring PenThread in UpdateTabletsImpl()");
return;
}
TabletDeviceInfo [] tabletdevices = penThread.WorkerGetTabletsInfo();
// First find out the index of the mouse device (usually the first at index 0)
uint indexMouseTablet = UInt32.MaxValue;
for (uint i = 0; i < tabletdevices.Length; i++)
{
// See if this is a bogus entry first.
if (tabletdevices[i].PimcTablet == null)
{
continue;
}
// If it is the mouse tablet device we want to ignore it.
if (tabletdevices[i].DeviceType == (TabletDeviceType)(-1))
{
indexMouseTablet = i;
tabletdevices[i].PimcTablet = null; // ignore this one!
}
}
// Now figure out count of valid tablet devices left
uint count = 0;
for (uint k = 0; k < tabletdevices.Length; k++)
{
if (tabletdevices[k].PimcTablet != null)
{
count++;
}
}
TabletDevice[] tablets = new TabletDevice[count];
uint tabletsIndex = 0;
uint unchangedTabletCount = 0;
for (uint iTablet = 0; iTablet < tabletdevices.Length; iTablet++)
{
if (tabletdevices[iTablet].PimcTablet == null)
{
continue; // Skip looking at this index (mouse and bogus tablets are ignored).
}
int id = tabletdevices[iTablet].Id;
// First see if same index has not changed (typical case)
if (tabletsIndex < _tablets.Length && _tablets[tabletsIndex] != null && _tablets[tabletsIndex].Id == id)
{
tablets[tabletsIndex] = _tablets[tabletsIndex];
_tablets[tabletsIndex] = null; // clear to ignore on cleanup pass.
unchangedTabletCount++;
}
else
{
// Look up and see if we have this tabletdevice created already...
TabletDevice tablet = null;
for (uint i = 0; i < _tablets.Length; i++)
{
if (_tablets[i] != null && _tablets[i].Id == id)
{
tablet = _tablets[i];
_tablets[i] = null; // clear it so we don't dispose it.
break;
}
}
// Not found so create it.
if (tablet == null)
{
try
{
tablet = new TabletDevice(new WispTabletDevice(tabletdevices[iTablet], penThread));
}
catch (InvalidOperationException ex)
{
// This is caused by the Stylus ID not being unique when trying
// to register it in the StylusLogic.__stylusDeviceMap. If we
// come across a dup then just ignore registering this tablet device.
// There seems to be an issue in wisptis where different tablet IDs get
// duplicate Stylus Ids when installing the VHID test devices.
if (ex.Data.Contains("System.Windows.Input.StylusLogic"))
{
continue; // Just go to next without adding this one.
}
else
{
throw; // not an expected exception, rethrow it.
}
}
}
tablets[tabletsIndex] = tablet;
}
tabletsIndex++;
}
if (unchangedTabletCount == _tablets.Length &&
unchangedTabletCount == tabletsIndex &&
tabletsIndex == count)
{
// Keep the _tablet reference when nothing changes.
// The reason is that if this method gets called from within
// CreateContexts while looping on _tablets, it could result in
// a null ref exception since the original _tablets array has
// been purged to nulls.
// NOTE: There is still the case of changing the ref (else case below)
// when tablet devices actually change. But such a case is rare
// (if not improbable) from within CreateContexts.
Array.Copy(tablets, 0, _tablets, 0, count);
_indexMouseTablet = indexMouseTablet;
}
else
{
// See if we need to re alloc the array due to invalid tabletdevice being seen.
if (tabletsIndex != count)
{
TabletDevice[] updatedTablets = new TabletDevice[tabletsIndex];
Array.Copy(tablets, 0, updatedTablets, 0, tabletsIndex);
tablets = updatedTablets;
}
DisposeTablets(); // Clean up any non null TabletDevice entries on old array.
_tablets = tablets; // set updated tabletdevice array
TabletDevices = new List <TabletDevice>(_tablets);
_indexMouseTablet = indexMouseTablet;
}
// DevDiv:1078091
// Any deferred tablet should be properly disposed of when applicable and
// removed from the list of deferred tablets.
DisposeDeferredTablets();
}
