internal void RegisterHwndForInput(InputManager inputManager, PresentationSource inputSource)
{
HwndSource hwndSource = (HwndSource)inputSource;
// Query the transform from HwndTarget when the first window is created.
if (!_transformInitialized)
{
if (hwndSource != null && hwndSource.CompositionTarget != null)
{
_transformToDevice = hwndSource.CompositionTarget.TransformToDevice;
Debug.Assert(_transformToDevice.HasInverse);
_transformInitialized = true;
}
}
// Keep track so we don't bother looking for changes if someone happened to query this before
// an Avalon window was created where we get TabletAdd/Removed notification.
bool initializedTablets = (_tabletDeviceCollection == null);
// This causes EnableCore to be called on TabletPC systems which enabled stylus input!
TabletDeviceCollection tablets = TabletDevices;
// Make sure that lock() does not cause reentrancy.
using(Dispatcher.DisableProcessing())
{
lock (__penContextsLock)
{
if (__penContextsMap.ContainsKey(inputSource))
{
throw new InvalidOperationException(SR.Get(SRID.PenService_WindowAlreadyRegistered));
}
PenContexts penContexts = new PenContexts(inputManager.StylusLogic, inputSource);
__penContextsMap[inputSource] = penContexts;
// If FIRST one set this as the one to manage TabletAdded/Removed notifications.
if (__penContextsMap.Count == 1)
{
// Make sure our view of TabletDevices is up to date we didn't just cause it
// to be initialized and we had some real tablet devices.
if (!initializedTablets && tablets.Count > 0)
{
tablets.UpdateTablets();
}
}
// Detect if this window is disabled. If so then let the pencontexts know.
int style = UnsafeNativeMethods.GetWindowLong(new HandleRef(this,hwndSource.CriticalHandle), NativeMethods.GWL_STYLE);
if ((style & NativeMethods.WS_DISABLED) != 0)
{
penContexts.IsWindowDisabled = true;
}
if ( _inputEnabled )
penContexts.Enable();
}
}
}
