/*
* $Id$
*
* Copyright (C) 2003-2015 JNode.org
*
* This library is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as published
* by the Free Software Foundation; either version 2.1 of the License, or
* (at your option) any later version.
*
* This library is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
* License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this library; If not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
package org.jnode.driver.input;
public class LogitechProtocol implements MouseProtocolHandler {
static final int BIT_LEFT = 0x01;
static final int BIT_RIGHT = 0x02;
static final int BIT_MIDDLE = 0x04;
static final int BIT_BUTTON_MASK = BIT_LEFT | BIT_RIGHT | BIT_MIDDLE;
static final int BIT_X_SIGN = 0x10;
static final int BIT_Y_SIGN = 0x20;
static final int BITS_XY_OVFL = 0x40 | 0x80;
public boolean supportsId(int id) {
return id == 0;
}
public String getName() {
return "Logitech Mouse";
}
public int getPacketSize() {
return 3;
}
public PointerEvent buildEvent(byte[] data) {
final int d0 = data[0] & 0xFF;
final int d1 = data[1] & 0xFF;
final int d2 = data[2] & 0xFF;
// In case of overflow, discard this packet
if ((d0 & BITS_XY_OVFL) != 0)
return null;
final int buttons = d0 & BIT_BUTTON_MASK;
final int x = (d1 != 0) ? d1 - ((d0 & BIT_X_SIGN) << 4) : 0;
final int y = (d2 != 0) ? ((d0 & BIT_Y_SIGN) << 3) - d2 : 0;
return new PointerEvent(buttons, x, y, PointerEvent.RELATIVE);
}
}