private void updateTargetWindow(XMotionEvent xmotion) {
assert XToolkit.isAWTLockHeldByCurrentThread();
int x = xmotion.get_x_root();
int y = xmotion.get_y_root();
long time = xmotion.get_time();
long subwindow = xmotion.get_subwindow();
/*
* If this event had occurred before the pointer was grabbed,
* query the server for the current root subwindow.
*/
if (xmotion.get_window() != xmotion.get_root()) {
XlibWrapper.XQueryPointer(
XToolkit.getDisplay(),
xmotion.get_root(),
XlibWrapper.larg1, // root
XlibWrapper.larg2, // subwindow
XlibWrapper.larg3, // x_root
XlibWrapper.larg4, // y_root
XlibWrapper.larg5, // x
XlibWrapper.larg6, // y
XlibWrapper.larg7); // modifiers
subwindow = Native.getLong(XlibWrapper.larg2);
}
if (targetRootSubwindow != subwindow) {
if (dragProtocol != null) {
dragProtocol.sendLeaveMessage(time);
/*
* Neither Motif DnD nor XDnD provide a mean for the target
* to notify the source that the pointer exits the drop site
* that occupies the whole top level.
* We detect this situation and post dragExit.
*/
if (targetAction != DnDConstants.ACTION_NONE) {
dragExit(x, y);
}
}
/* Update the global state. */
doUpdateTargetWindow(subwindow, time);
if (dragProtocol != null) {
dragProtocol.sendEnterMessage(sourceFormats, sourceAction, sourceActions, time);
}
}
}
