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/****************************************************************************
**
** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the documentation of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:FDL$
** GNU Free Documentation License
** Alternatively, this file may be used under the terms of the GNU Free
** Documentation License version 1.3 as published by the Free Software
** Foundation and appearing in the file included in the packaging of
** this file.
**
** Other Usage
** Alternatively, this file may be used in accordance with the terms
** and conditions contained in a signed written agreement between you
** and Nokia.
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
/*!
\page qt-embedded-pointer.html
\title Qt for Embedded Linux Pointer Handling
\ingroup qt-embedded-linux
When running a \l{Qt for Embedded Linux} application, it either runs as a
server or connects to an existing server. The mouse driver is
loaded by the server application when it starts running, using
Qt's \l {How to Create Qt Plugins}{plugin system}.
Internally in the client/server protocol, all system generated
events, including pointer events, are passed to the server
application which then propagates the event to the appropriate
client. Note that pointer handling in \l{Qt for Embedded Linux} works for
both mouse and mouse-like devices such as touch panels and
trackballs.
Contents:
\tableofcontents
\section1 Available Drivers
\l{Qt for Embedded Linux} provides ready-made drivers for the MouseMan,
IntelliMouse, Microsoft and Linux Touch Panel protocols, for the
standard Linux Input Subsystem as well as the universal touch screen
library, tslib. Run the \c configure script to list the available
drivers:
\if defined(QTOPIA_PHONE)
\snippet doc/src/snippets/code/doc_src_emb-pointer.qdoc 0
\bold{Note:} By default only the PC mouse driver is enabled.
The various drivers can be enabled and disabled using the \c
configure script. For example:
\snippet doc/src/snippets/code/doc_src_emb-pointer.qdoc 1
\else
\snippet doc/src/snippets/code/doc_src_emb-pointer.qdoc 2
In the default Qt configuration, only the "pc" mouse driver is
enabled. The various drivers can be enabled and disabled using
the \c configure script. For example:
\snippet doc/src/snippets/code/doc_src_emb-pointer.qdoc 3
\endif
Custom mouse drivers can be implemented by subclassing the
QWSMouseHandler class and creating a mouse driver plugin (derived
from the QMouseDriverPlugin class). The default implementation of the
QMouseDriverFactory class will automatically detect the plugin,
loading the driver into the server application at run-time.
If you are creating a driver for a device that needs calibration
or noise reduction, such as a touchscreen, derive from the
QWSCalibratedMouseHandler subclass instead to take advantage of
its calibration functionality.
\if defined(QTOPIA_PHONE)
For a tutorial on how to add a new keyboard driver plug-in
see: \l {Tutorial: Implementing a Device Plug-in}.
\endif
\section1 Specifying a Driver
Provided that the "pc" mouse driver is enabled, \l{Qt for Embedded Linux} will
try to auto-detect the mouse device if it is one of the supported
types on \c /dev/psaux or one of the \c /dev/ttyS? serial
lines. If multiple mice are detected, all may be used
simultaneously.
Note that \l{Qt for Embedded Linux} does not support auto-detection of \e
{touch panels} in which case the driver must be specified
explicitly to determine which device to use.
To manually specify which driver to use, set the \c QWS_MOUSE_PROTO
environment variable. For example (if the current shell is bash,
ksh, zsh or sh):
\snippet doc/src/snippets/code/doc_src_emb-pointer.qdoc 4
The valid values for the \c <driver> argument are \c MouseMan, \c
IntelliMouse, \c Microsoft, \c LinuxTP, \c LinuxInput, \c
Tslib and \l {QMouseDriverPlugin::keys()}{keys} identifying custom
drivers, and the driver specific options are typically a device,
e.g., \c /dev/mouse for mouse devices and \c /dev/ts for touch
panels.
Multiple mouse drivers can be specified in one go:
\snippet doc/src/snippets/code/doc_src_emb-pointer.qdoc 5
Input will be read from all specified drivers.
\table
\header \o The Tslib Mouse Driver
\row
\o
The tslib mouse driver inherits the QWSCalibratedMouseHandler
class, providing calibration and noise reduction functionality in
addition to generating mouse events for devices using the
Universal Touch Screen Library.
To be able to compile this mouse handler, \l{Qt for Embedded Linux} must be
configured with the \c -qt-mouse-tslib option as described
above. In addition, the tslib headers and library must be present
in the build environment.
The tslib sources can be downloaded from \l
http://tslib.berlios.de. Specify the location of the library and
its headers using -L and -I options in the \c qmake.conf file in
your \c mkspec. Also it can be helpful to add a -rpath-link:
\snippet doc/src/snippets/code/doc_src_emb-pointer.pro 7
In order to use this mouse driver, tslib must also be correctly
installed on the target machine. This includes providing a \c
ts.conf configuration file and setting the neccessary environment
variables (see the README file provided with tslib for details).
The \c ts.conf file will usually contain the following two lines:
\snippet doc/src/snippets/code/doc_src_emb-pointer.qdoc 8
To make \l{Qt for Embedded Linux} explicitly choose the tslib mouse
handler, set the \c QWS_MOUSE_PROTO environment variable as explained
above.
\endtable
\section1 Troubleshooting
\section2 Device Files
Make sure you are using the correct device file.
As a first step, you can test whether the device file actually gives any
output. For instance, if you have specified the mouse driver with
\snippet doc/src/snippets/code/doc_src_emb-pointer.qdoc 9
then try examining
the output from the device by entering the following command in a console:
\snippet doc/src/snippets/code/doc_src_emb-pointer.qdoc 10
If you see output from the device printed on the console when you move
the mouse, you are probably using the correct device file; otherwise, you
will need to experiment to find the correct device file.
\section2 File Permissions
Make sure you have sufficient permissions to access the device file.
The Qt for Embedded Linux server process needs at least read permission for the
device file. Some drivers also require write access to the device file.
For instance, if you have specified the mouse driver with
\snippet doc/src/snippets/code/doc_src_emb-pointer.qdoc 11
then examine the permissions of the device file by entering the
following command in a console:
\snippet doc/src/snippets/code/doc_src_emb-pointer.qdoc show permissions
Change the permissions of the device file, if necessary, in the following
way:
\snippet doc/src/snippets/code/doc_src_emb-pointer.qdoc 12
If the device file is actually a symbolic link to another file, you must
change the permissions of the actual file instead.
*/
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