/** Activate automatic grab on first ButtonPress, deactivate on full mouse release */ public void handleButtonPressRelease(XEvent xev) { XButtonEvent xbe = xev.get_xbutton(); final int buttonState = xbe.get_state() & (Button1Mask | Button2Mask | Button3Mask | Button4Mask | Button5Mask); switch (xev.get_type()) { case ButtonPress: if (buttonState == 0) { XAwtState.setAutoGrabWindow(this); } break; case ButtonRelease: if (isFullRelease(buttonState, xbe.get_button())) { XAwtState.setAutoGrabWindow(null); } break; } }