/**************************************************************************** ** ** Miscellaneous documentation that doesn't fit anywhere else ** ** Copyright (C) 1992-2008 Trolltech ASA. All rights reserved. ** ** This file is part of the Qt GUI Toolkit. ** ** This file may be used under the terms of the GNU General ** Public License versions 2.0 or 3.0 as published by the Free ** Software Foundation and appearing in the files LICENSE.GPL2 ** and LICENSE.GPL3 included in the packaging of this file. ** Alternatively you may (at your option) use any later version ** of the GNU General Public License if such license has been ** publicly approved by Trolltech ASA (or its successors, if any) ** and the KDE Free Qt Foundation. ** ** Please review the following information to ensure GNU General ** Public Licensing requirements will be met: ** http://trolltech.com/products/qt/licenses/licensing/opensource/. ** If you are unsure which license is appropriate for your use, please ** review the following information: ** http://trolltech.com/products/qt/licenses/licensing/licensingoverview ** or contact the sales department at sales@trolltech.com. ** ** This file may be used under the terms of the Q Public License as ** defined by Trolltech ASA and appearing in the file LICENSE.QPL ** included in the packaging of this file. Licensees holding valid Qt ** Commercial licenses may use this file in accordance with the Qt ** Commercial License Agreement provided with the Software. ** ** This file is provided "AS IS" with NO WARRANTY OF ANY KIND, ** INCLUDING THE WARRANTIES OF DESIGN, MERCHANTABILITY AND FITNESS FOR ** A PARTICULAR PURPOSE. Trolltech reserves all rights not granted ** herein. ** **********************************************************************/ /*! \page commonproblems.html \title Brief Technical FAQ This document describes how to use more than one Qt version on one machine and how to use Qt on X11 without a window manager. In addition it explains the most common source of link errors with Qt. Other frequently asked questions can be found in the \link http://www.trolltech.com/developer/faqs/ FAQ index\endlink and in the \link http://www.trolltech.com/developer/faqs/technical.html Technical FAQ\endlink. \list \i \link #linkerror Link error, complaining about a lack of vtbl, _vtbl, __vtbl or similar\endlink \i \link #diffver Using different versions of Qt on the same machine\endlink \list \i \link #qtbin Developers building for a single version of Qt on Unix - Qt binary packages\endlink \i \link #qtsrc Developers building for two versions of Qt on Unix - Qt sources\endlink \endlist \i \link #nowinman Using Qt on X11 without a window manager\endlink \i \link distributingqt.html Distributing Qt Applications\endlink \endlist \target linkerror \section1 Link error, complaining about a lack of \c vtbl, \c _vtbl, \c __vtbl or similar This indicates that you've included the Q_OBJECT macro in a class declaration and probably also run the moc, but forgot to link the moc-generated object code into your executable. See \link moc.html Using the Meta Object Compiler\endlink for details on how to use moc. \target diffver \section1 Using different versions of Qt on the same machine Qt programs need the following components of a Qt distribution:
Header files - Compile time
Programmers need to include the Qt header files. The Qt header files are usually located in the \c include subdirectory of Qt distributions. Care must be taken to include the header files of the relevant release of Qt. Those with a command-line compiler will typically use options such as \c{/I%QTDIR%\include} or \c{-I"$QTDIR"/include} provided \c QTDIR specifies the relevant release of Qt.
Meta Object Compiler and other tools - Compile time
Programmers need to run \e moc and other tools such as \e uic. These tools are usually located in the \c bin subdirectory of Qt distributions. Either run \c "$QTDIR"/bin/moc and \c "$QTDIR"/bin/uic or add \c "$QTDIR"/bin to your \c PATH and run \c moc and \c uic. If you use \c qmake the appropriate lines will be added to your Makefiles so that \e uic and \e moc will be executed as required.
Static or shared libraries - Link time
Programmers need to link with the Qt static or shared libraries. The Qt libraries are usually located in the \c lib subdirectory of Qt distributions. Care must be taken to link with the libraries of the relevant release of Qt. Those with a command-line compiler will typically use options such as \c{/L%QTDIR%\lib\qt.lib} or \c{-L"$QTDIR"/lib} \c -lqt provided \c QTDIR specifies the relevant release of Qt.
Shared libraries - Run time
Users of programs linked with shared Qt libraries need these same shared libraries to run these programs. The Qt libraries are usually located in the \c lib subdirectory of Qt distributions. Shared libraries are made available to programs in places such as \c{C:\windows\system} on Windows platforms, directories listed in file \c /etc/ld.so.conf on Linux, standard \c lib directories on Unix, or directories listed in environment variables \c LD_LIBRARY_PATH, \c SHLIB_PATH, or \c LIBPATH on various Unix flavours. Make the relevant Qt libraries available using one of these mechanisms.
Qt distributions consist of different files needed at compile time, link time, or run time. Trolltech distributes Qt in the form of a source package that contain all these files once they have been built. Other vendors distribute Qt in the form of binary packages. Binary packages usually consist of two parts: \list \i shared libraries in the run time package, usually called \c qt3. \i header files, static libraries, the moc and other tools in the developers' kit, usually called \c qt3-dev. \endlist Depending on how you are using Qt, you need to make specific parts of the Qt distribution available to your programs. Typical situations are described below. \target qtbin \section2 Developers building for a single version of Qt on Unix - Qt binary packages You build programs with a single version of Qt, but you still need to run programs linked with another version of Qt. You are typically a Linux developer who builds programs for Qt 3.x on a KDE desktop based on Qt 2.x. Qt packages are usually split into a shared library package with a name like \c qt and a developer package with a name like \c qt-dev. You will need the appropriate packages: \list \i To build programs you will need the header files, the libraries, the moc and other tools from Qt 3.x. They are included in the developer package of Qt 3.x (\c qt3-dev or similar). \i To run programs you will need the shared libraries of Qt 3.x and Qt 2.x. They are included in the regular packages of Qt 3.x (\c qt3 or similar) and Qt 2.x (\c qt2 or similar). \endlist Just install the packages, \c qt2, \c qt3, and \c qt3-dev. You may need to set the environment variable \c QTDIR to point to Qt 3.x. \target qtsrc \section2 Developers building for two versions of Qt on Unix - Qt sources You build and run programs for Qt 2.x and Qt 3.x. You will need: \list \i the header files, the libraries, the moc and other tools from Qt 3.x and Qt 2.x to build programs, \i the shared libraries of Qt 3.x and Qt 2.x to run programs. \endlist Get the source distributions of both Qt 2.x and Qt 3.x. \list 1 \i Install and build Qt 2.x and Qt 3.x, usually in \c /opt or \c /usr/local. In the case of \c /opt: \code $ cd /opt $ gunzip -c \c qt-x11-2.3.1.tar.gz | tar xf - $ cd qt-2.3.1 $ setenv QTDIR /opt/qt-2.3.1 $ configure [options] $ make $ cd /opt $ gunzip -c qt-x11-free-3.0.0.tar.gz | tar xf - $ cd qt-3.0.0 $ setenv QTDIR /opt/qt-3.0.0 $ configure [options] $ make \endcode \i Make shared libraries available to programs at run time. Either add both \c /opt/qt-2.3.1/lib and \c /opt/qt-3.0.0/lib to your environment variable \c LD_LIBRARY_PATH or file \c /etc/ld.so.conf or whataver mechanism you're using, or make links to the libraries in a standard directory like \c /usr/local/lib: \code cd /usr/local/lib ln -s /opt/qt-2.3.1/lib/libqt.so.2 . ln -s /opt/qt-2.3.1/lib/libqt-mt.so.2 . ln -s /opt/qt-2.3.1/lib/libqutil.so.1 . ln -s /opt/qt-3.0.0/lib/libqt.so.3 . ln -s /opt/qt-3.0.0/lib/libqui.so.1 . \endcode \endlist To develop with Qt 2.x use: \code setenv QTDIR /opt/qt-2.3.1 setenv PATH ${QTDIR}/bin:${PATH} \endcode To develop with Qt 3.x use: \code setenv QTDIR /opt/qt-3.0.0 setenv PATH ${QTDIR}/bin:${PATH} \endcode Setting \c QTDIR ensures that the proper resources are used, such as the documentation appropriate to the version of Qt you're using. Also your Makfiles may refer to \c "$QTDIR"/include and \c "$QTDIR"/lib to include the proper header files and link with the proper libraries. Setting the \c PATH ensures that the proper version of moc and other tools is being used. \target nowinman \section1 Using Qt on X11 without a window manager When using Qt without a window manager on Unix/X11, you will most likely experience focus problems. Without a window manager, there is no focus handling on X11, and no concept of an active window either. If you want your application to work in such an environment, you have to explicitly mark a window as active \e after showing it: \code yourWindow->show(); yourWindow->setActiveWindow(); \endcode Note that setActiveWindow() won't work if the widget does not become physically visible during this event cycle. However, without a window manager running, this is guaranteed to happen. For the curious reader: setActiveWindow() emulates a window manager by explicitly setting the X Input Focus to a widget's top level window. */ /*! \page bughowto.html \title How to Report A Bug If you think you have found a bug in Qt, we would like to hear about it so that we can fix it. Before reporting a bug, please check the \link commonproblems.html Brief Technical FAQ\endlink, the \link http://www.trolltech.com/developer/faqs/ FAQs\endlink, and the \link http://www.trolltech.com/platforms/ Platform Notes\endlink on our web site to see if the issue is already known. Always include the following information in your bug report: \list 1 \i The name and version number of your compiler \i The name and version number of your operating system \i The version of Qt you are using, and what configure options it was compiled with. \endlist If the problem you are reporting is only at visible run-time, try to create a small test program that shows the problem when run. Often, such a program can be created with some minor changes to one of the many example programs in the \c{qt/examples} directory. Please send the bug report to \link mailto:qt-bugs@trolltech.com qt-bugs@trolltech.com\endlink. */ /*! \page license.html \title Qt Open Source Edition License Agreement The Qt Open Source Edition is distributed under the Q Public License (QPL). It allows free use of Qt Open Source Edition for running software developed by others, and free use of Qt Open Source Edition for development of free and open source software. There is \link http://www.trolltech.com/qpl/ more information about the QPL\endlink at the Trolltech web site. Note that the Qt/Embedded Open Source Edition is not distributed under the QPL, but under the \link gpl.html GNU General Public License (GPL)\endlink. For development non-free/proprietary software, the Qt Professional Edition is available. It has a normal commercial library license, with none of the special restrictions of the QPL or the GPL.

THE Q PUBLIC LICENSE version 1.0

Copyright (C) 1999-2008 Trolltech ASA, Norway.
Everyone is permitted to copy and distribute this license document.
The intent of this license is to establish freedom to share and change the software regulated by this license under the open source model. This license applies to any software containing a notice placed by the copyright holder saying that it may be distributed under the terms of the Q Public License version 1.0. Such software is herein referred to as the Software. This license covers modification and distribution of the Software, use of third-party application programs based on the Software, and development of free software which uses the Software.

Granted Rights

1. You are granted the non-exclusive rights set forth in this license provided you agree to and comply with any and all conditions in this license. Whole or partial distribution of the Software, or software items that link with the Software, in any form signifies acceptance of this license. 2. You may copy and distribute the Software in unmodified form provided that the entire package, including - but not restricted to - copyright, trademark notices and disclaimers, as released by the initial developer of the Software, is distributed. 3. You may make modifications to the Software and distribute your modifications, in a form that is separate from the Software, such as patches. The following restrictions apply to modifications:
a. Modifications must not alter or remove any copyright notices in the Software. b. When modifications to the Software are released under this license, a non-exclusive royalty-free right is granted to the initial developer of the Software to distribute your modification in future versions of the Software provided such versions remain available under these terms in addition to any other license(s) of the initial developer.
4. You may distribute machine-executable forms of the Software or machine-executable forms of modified versions of the Software, provided that you meet these restrictions:
a. You must include this license document in the distribution. b. You must ensure that all recipients of the machine-executable forms are also able to receive the complete machine-readable source code to the distributed Software, including all modifications, without any charge beyond the costs of data transfer, and place prominent notices in the distribution explaining this. c. You must ensure that all modifications included in the machine-executable forms are available under the terms of this license.
5. You may use the original or modified versions of the Software to compile, link and run application programs legally developed by you or by others. 6. You may develop application programs, reusable components and other software items that link with the original or modified versions of the Software. These items, when distributed, are subject to the following requirements:
a. You must ensure that all recipients of machine-executable forms of these items are also able to receive and use the complete machine-readable source code to the items without any charge beyond the costs of data transfer. b. You must explicitly license all recipients of your items to use and re-distribute original and modified versions of the items in both machine-executable and source code forms. The recipients must be able to do so without any charges whatsoever, and they must be able to re-distribute to anyone they choose. c. If the items are not available to the general public, and the initial developer of the Software requests a copy of the items, then you must supply one.

Limitations of Liability

In no event shall the initial developers or copyright holders be liable for any damages whatsoever, including - but not restricted to - lost revenue or profits or other direct, indirect, special, incidental or consequential damages, even if they have been advised of the possibility of such damages, except to the extent invariable law, if any, provides otherwise.

No Warranty

The Software and this license document are provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.

Choice of Law

This license is governed by the Laws of Norway. Disputes shall be settled by Oslo City Court. */ /*! \page gpl.html \title GNU General Public License The Qt GUI Toolkit is Copyright (C) 1994-2008 Trolltech ASA. The Qt Open Source Edition and the Qt/Embedded Open Source Edition are available under the GPL. The Qt Open Source Edition (for Unix/X11) is also available under the \link license.html QPL\endlink. \code You may use, distribute and copy the Qt GUI Toolkit under the terms of GNU General Public License version 2, which is displayed below. GNU GENERAL PUBLIC LICENSE Version 2, June 1991 Copyright (C) 1989, 1991 Free Software Foundation, Inc. 51 Franklin Steet, Fifth Floor, Boston, MA 02110-1301, USA Everyone is permitted to copy and distribute verbatim copies of this license document, but changing it is not allowed. Preamble The licenses for most software are designed to take away your freedom to share and change it. By contrast, the GNU General Public License is intended to guarantee your freedom to share and change free software--to make sure the software is free for all its users. This General Public License applies to most of the Free Software Foundation's software and to any other program whose authors commit to using it. (Some other Free Software Foundation software is covered by the GNU Library General Public License instead.) You can apply it to your programs, too. When we speak of free software, we are referring to freedom, not price. Our General Public Licenses are designed to make sure that you have the freedom to distribute copies of free software (and charge for this service if you wish), that you receive source code or can get it if you want it, that you can change the software or use pieces of it in new free programs; and that you know you can do these things. To protect your rights, we need to make restrictions that forbid anyone to deny you these rights or to ask you to surrender the rights. These restrictions translate to certain responsibilities for you if you distribute copies of the software, or if you modify it. For example, if you distribute copies of such a program, whether gratis or for a fee, you must give the recipients all the rights that you have. You must make sure that they, too, receive or can get the source code. And you must show them these terms so they know their rights. We protect your rights with two steps: (1) copyright the software, and (2) offer you this license which gives you legal permission to copy, distribute and/or modify the software. Also, for each author's protection and ours, we want to make certain that everyone understands that there is no warranty for this free software. If the software is modified by someone else and passed on, we want its recipients to know that what they have is not the original, so that any problems introduced by others will not reflect on the original authors' reputations. Finally, any free program is threatened constantly by software patents. We wish to avoid the danger that redistributors of a free program will individually obtain patent licenses, in effect making the program proprietary. To prevent this, we have made it clear that any patent must be licensed for everyone's free use or not licensed at all. The precise terms and conditions for copying, distribution and modification follow. GNU GENERAL PUBLIC LICENSE TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION 0. This License applies to any program or other work which contains a notice placed by the copyright holder saying it may be distributed under the terms of this General Public License. The "Program", below, refers to any such program or work, and a "work based on the Program" means either the Program or any derivative work under copyright law: that is to say, a work containing the Program or a portion of it, either verbatim or with modifications and/or translated into another language. (Hereinafter, translation is included without limitation in the term "modification".) Each licensee is addressed as "you". Activities other than copying, distribution and modification are not covered by this License; they are outside its scope. The act of running the Program is not restricted, and the output from the Program is covered only if its contents constitute a work based on the Program (independent of having been made by running the Program). Whether that is true depends on what the Program does. 1. You may copy and distribute verbatim copies of the Program's source code as you receive it, in any medium, provided that you conspicuously and appropriately publish on each copy an appropriate copyright notice and disclaimer of warranty; keep intact all the notices that refer to this License and to the absence of any warranty; and give any other recipients of the Program a copy of this License along with the Program. You may charge a fee for the physical act of transferring a copy, and you may at your option offer warranty protection in exchange for a fee. 2. You may modify your copy or copies of the Program or any portion of it, thus forming a work based on the Program, and copy and distribute such modifications or work under the terms of Section 1 above, provided that you also meet all of these conditions: a) You must cause the modified files to carry prominent notices stating that you changed the files and the date of any change. b) You must cause any work that you distribute or publish, that in whole or in part contains or is derived from the Program or any part thereof, to be licensed as a whole at no charge to all third parties under the terms of this License. c) If the modified program normally reads commands interactively when run, you must cause it, when started running for such interactive use in the most ordinary way, to print or display an announcement including an appropriate copyright notice and a notice that there is no warranty (or else, saying that you provide a warranty) and that users may redistribute the program under these conditions, and telling the user how to view a copy of this License. (Exception: if the Program itself is interactive but does not normally print such an announcement, your work based on the Program is not required to print an announcement.) These requirements apply to the modified work as a whole. If identifiable sections of that work are not derived from the Program, and can be reasonably considered independent and separate works in themselves, then this License, and its terms, do not apply to those sections when you distribute them as separate works. But when you distribute the same sections as part of a whole which is a work based on the Program, the distribution of the whole must be on the terms of this License, whose permissions for other licensees extend to the entire whole, and thus to each and every part regardless of who wrote it. Thus, it is not the intent of this section to claim rights or contest your rights to work written entirely by you; rather, the intent is to exercise the right to control the distribution of derivative or collective works based on the Program. In addition, mere aggregation of another work not based on the Program with the Program (or with a work based on the Program) on a volume of a storage or distribution medium does not bring the other work under the scope of this License. 3. You may copy and distribute the Program (or a work based on it, under Section 2) in object code or executable form under the terms of Sections 1 and 2 above provided that you also do one of the following: a) Accompany it with the complete corresponding machine-readable source code, which must be distributed under the terms of Sections 1 and 2 above on a medium customarily used for software interchange; or, b) Accompany it with a written offer, valid for at least three years, to give any third party, for a charge no more than your cost of physically performing source distribution, a complete machine-readable copy of the corresponding source code, to be distributed under the terms of Sections 1 and 2 above on a medium customarily used for software interchange; or, c) Accompany it with the information you received as to the offer to distribute corresponding source code. (This alternative is allowed only for noncommercial distribution and only if you received the program in object code or executable form with such an offer, in accord with Subsection b above.) The source code for a work means the preferred form of the work for making modifications to it. For an executable work, complete source code means all the source code for all modules it contains, plus any associated interface definition files, plus the scripts used to control compilation and installation of the executable. However, as a special exception, the source code distributed need not include anything that is normally distributed (in either source or binary form) with the major components (compiler, kernel, and so on) of the operating system on which the executable runs, unless that component itself accompanies the executable. If distribution of executable or object code is made by offering access to copy from a designated place, then offering equivalent access to copy the source code from the same place counts as distribution of the source code, even though third parties are not compelled to copy the source along with the object code. 4. You may not copy, modify, sublicense, or distribute the Program except as expressly provided under this License. Any attempt otherwise to copy, modify, sublicense or distribute the Program is void, and will automatically terminate your rights under this License. However, parties who have received copies, or rights, from you under this License will not have their licenses terminated so long as such parties remain in full compliance. 5. You are not required to accept this License, since you have not signed it. However, nothing else grants you permission to modify or distribute the Program or its derivative works. These actions are prohibited by law if you do not accept this License. Therefore, by modifying or distributing the Program (or any work based on the Program), you indicate your acceptance of this License to do so, and all its terms and conditions for copying, distributing or modifying the Program or works based on it. 6. Each time you redistribute the Program (or any work based on the Program), the recipient automatically receives a license from the original licensor to copy, distribute or modify the Program subject to these terms and conditions. You may not impose any further restrictions on the recipients' exercise of the rights granted herein. You are not responsible for enforcing compliance by third parties to this License. 7. If, as a consequence of a court judgment or allegation of patent infringement or for any other reason (not limited to patent issues), conditions are imposed on you (whether by court order, agreement or otherwise) that contradict the conditions of this License, they do not excuse you from the conditions of this License. If you cannot distribute so as to satisfy simultaneously your obligations under this License and any other pertinent obligations, then as a consequence you may not distribute the Program at all. For example, if a patent license would not permit royalty-free redistribution of the Program by all those who receive copies directly or indirectly through you, then the only way you could satisfy both it and this License would be to refrain entirely from distribution of the Program. If any portion of this section is held invalid or unenforceable under any particular circumstance, the balance of the section is intended to apply and the section as a whole is intended to apply in other circumstances. It is not the purpose of this section to induce you to infringe any patents or other property right claims or to contest validity of any such claims; this section has the sole purpose of protecting the integrity of the free software distribution system, which is implemented by public license practices. Many people have made generous contributions to the wide range of software distributed through that system in reliance on consistent application of that system; it is up to the author/donor to decide if he or she is willing to distribute software through any other system and a licensee cannot impose that choice. This section is intended to make thoroughly clear what is believed to be a consequence of the rest of this License. 8. If the distribution and/or use of the Program is restricted in certain countries either by patents or by copyrighted interfaces, the original copyright holder who places the Program under this License may add an explicit geographical distribution limitation excluding those countries, so that distribution is permitted only in or among countries not thus excluded. In such case, this License incorporates the limitation as if written in the body of this License. 9. The Free Software Foundation may publish revised and/or new versions of the General Public License from time to time. Such new versions will be similar in spirit to the present version, but may differ in detail to address new problems or concerns. Each version is given a distinguishing version number. If the Program specifies a version number of this License which applies to it and "any later version", you have the option of following the terms and conditions either of that version or of any later version published by the Free Software Foundation. If the Program does not specify a version number of this License, you may choose any version ever published by the Free Software Foundation. 10. If you wish to incorporate parts of the Program into other free programs whose distribution conditions are different, write to the author to ask for permission. For software which is copyrighted by the Free Software Foundation, write to the Free Software Foundation; we sometimes make exceptions for this. Our decision will be guided by the two goals of preserving the free status of all derivatives of our free software and of promoting the sharing and reuse of software generally. NO WARRANTY 11. BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW. EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING, REPAIR OR CORRECTION. 12. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. END OF TERMS AND CONDITIONS Appendix: How to Apply These Terms to Your New Programs If you develop a new program, and you want it to be of the greatest possible use to the public, the best way to achieve this is to make it free software which everyone can redistribute and change under these terms. To do so, attach the following notices to the program. It is safest to attach them to the start of each source file to most effectively convey the exclusion of warranty; and each file should have at least the "copyright" line and a pointer to where the full notice is found. Copyright (C) 19yy This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. This program 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 General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 51 Franklin Steet, Fifth Floor, Boston, MA 02110-1301, USA. Also add information on how to contact you by electronic and paper mail. If the program is interactive, make it output a short notice like this when it starts in an interactive mode: Gnomovision version 69, Copyright (C) 19yy name of author Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'. This is free software, and you are welcome to redistribute it under certain conditions; type `show c' for details. The hypothetical commands `show w' and `show c' should show the appropriate parts of the General Public License. Of course, the commands you use may be called something other than `show w' and `show c'; they could even be mouse-clicks or menu items--whatever suits your program. You should also get your employer (if you work as a programmer) or your school, if any, to sign a "copyright disclaimer" for the program, if necessary. Here is a sample; alter the names: Yoyodyne, Inc., hereby disclaims all copyright interest in the program `Gnomovision' (which makes passes at compilers) written by James Hacker. , 1 April 1989 Ty Coon, President of Vice This General Public License does not permit incorporating your program into proprietary programs. If your program is a subroutine library, you may consider it more useful to permit linking proprietary applications with the library. If this is what you want to do, use the GNU Library General Public License instead of this License. \endcode */ /*! \page troll.html \title Company Information Trolltech is an international software company with headquarters in Oslo, the capital of Norway, and with offices in Brisbane, Australia, and Redwood City, California. Our flagship product is \link http://www.trolltech.com/products/qt.html Qt\endlink, the multi-platform C++ GUI toolkit. Qt enables you to build professional, efficient, portable and maintainable GUI applications quickly and easily. \link http://www.trolltech.com/products/embedded/index.html Qt/Embedded\endlink, the embedded version of Qt, is designed to power todays new generation of embedded computers and electronic consumer devices. On top of that, \link http://www.trolltech.com/products/qtopia/index.html Qtopia\endlink provides a window system and application suite for handheld devices. \section1 Software that makes Sense Our motto expresses the vision behind our products. We design our products to give our customers the feeling of "this is the way that things were always meant to be". We know that it is crucial for our customers to have good tools for making good software. Therefore, we do not compromise our demands for superior design and technical quality when we develop our products. Trolltech is also known for providing top quality technical support to our customers. At Trolltech, support inquiries are handled by the most qualified developers and designers themselves. \section1 History Trolltech was founded in 1994. The core team of designers at Trolltech started developing Qt in 1992, and the first commercial version of Qt was released in 1995. Since then, Trolltech has experienced rapid growth, and Qt is currently used in thousands of successful commercial software development projects world wide. At Trolltech, we continously work to improve and expand Qt to ensure that it always represents the state of the art in usability, look and feel, performance, and stability. For more information, please visit the \link http://www.trolltech.com Trolltech website\endlink. \section1 Contact Information
Email

 \link mailto:info@trolltech.com info@trolltech.com\endlink \link mailto:sales@trolltech.com sales@trolltech.com\endlink

General inquiries and questions. Please check the \link http://www.trolltech.com/faq/ FAQ\endlink to see if your question is already answered there.
Inquires related to purchasing, pricing and availability of Trolltech products
\link mailto:www@trolltech.com www@trolltech.com\endlink \link mailto:qt-bugs@trolltech.com qt-bugs@trolltech.com\endlink

Comments about our web pages
Use this address for bug reports; \e please read (the very short) \link bughowto.html How to Report a Bug\endlink page \e first.

Note that Trolltech uses the \link http://mail-abuse.org/rbl/ RBL\endlink and \link http://work-rss.mail-abuse.org/rss/ RSS\endlink databases to cut down on spam. If your mail server is listed, you will regrettably not be able to send us mail. The \link http://www.mail-abuse.org/tsi/ MAPS TSI\endlink pages provide information about how to secure your server.
 
 
Norway Office

 Telephone Street/Mail Address

General inquiries: +47 21 60 48 00
Sandakerveien 116
PO Box 4332 Nydalen
NO-0402 Oslo
Norway
Telefax

All inquiries: +47 21 60 48 01
 
 
USA Office

 Telephone Street/Mail Address

General inquiries: (+1) 650-551-1676
555 Twin Dolphin Drive
Suite 280
Redwood City, CA 94065
USA
Telefax

All inquiries: (+1) 650-551-1851
*/ /*! \page guibooks.html \title Books about GUI This is not a comprehensive list of books, there are many other books worth buying. Here we mention just a few GUI/UI books that don't gather dust in our shelves. C++ GUI Programming with Qt 3 by Jasmin Blanchette and Mark Summerfield, ISBN 0-13-124072-2. This is the Official Qt book written by two veteran Trolls. \link http://www.amazon.com/exec/obidos/ASIN/0131240722/trolltech/ (Read more about it or buy it.)\endlink The Design of Everyday Things by Donald Norman, ISBN 0-38526774-6, is one of the classics of human interface design. Norman shows how badly something as simple as a kitchen stove can be designed, and everyone should read it who will design a dialog box, write an error message, or design just about anything else humans are supposed to use. \link http://www.amazon.com/exec/obidos/ASIN/0385267746/trolltech/t (Read more or buy it.)\endlink \target fowler GUI Design Handbook by Susan Fowler, ISBN 0-07-059274-8, is an alphabetical dictionary of widgets and other user interface elements, with comprehensive coverage of each. Each chapter covers one widget or other element, contains the most important recommendation from the Macintosh, Windows and Motif style guides, notes about common problems, comparison with other widgets that can serve some of the same roles as this one, etc. \link http://www.amazon.com/exec/obidos/ASIN/0070592748/trolltech/t (Read more or buy it.)\endlink Macintosh Human Interface Guidelines, second edition, ISBN 0-201-62216-5, is worth buying for the \e {don't}s alone. Even though you're not writing Macintosh software, avoiding most of what it advises against will produce more easily comprehensible software. Doing what it tells you to \e do helps, too. \link http://www.amazon.com/exec/obidos/ASIN/0201622165/trolltech/t (Read more or buy it.)\endlink This book is now available \link http://developer.apple.com/techpubs/mac/HIGuidelines/HIGuidelines-2.html on the web\endlink and there is a \link http://developer.apple.com/techpubs/mac/HIGOS8Guide/thig-2.html Mac OS 8 addendum.\endlink The Microsoft Windows User Experience, ISBN 1-55615-679-0, is Microsoft's look and feel Bible. Indispensable for everyone who has customers that worship Microsoft, and it's quite good, too. \link http://www.amazon.com/exec/obidos/ASIN/0735605661/trolltech/t (Read more or buy it.)\endlink Microsoft's guidelines are often available on the web, but have occasionally been hidden in an impenetrable maze of javascript. \link http://msdn.microsoft.com/library/en-us/dnwue/html/welcome.asp Try and see.\endlink The Icon Book by William Horton, ISBN 0-471-59900-X, is a perhaps the only thorough coverage of icons and icon use in software. In order for icons to be successful, people must be able to do four things with them: decode, recognize, find and activate them. This book explains these goals from scratch and how to reach them, both with single icons and icon families. Some 500 examples are scattered throughout the text, generally in groups of four or five. \link http://www.amazon.com/exec/obidos/ASIN/047159900X/trolltech/t (Read more or buy it.)\endlink \section1 Buying these books from \link http://www.amazon.com/text/ Amazon.com.\endlink These books are made available in association with Amazon.com, our favorite on-line bookstore. Here is more information about \link http://www.amazon.com/exec/obidos/subst/help/shipping-policy.html/t Amazon.com's shipping options\endlink and its \link http://www.amazon.com/exec/obidos/subst/help/desk.html/t customer service.\endlink When you buy a book by following one of these links, Amazon.com gives about 15% of the purchase price to \link http://www.amnesty.org Amnesty International.\endlink */ /*! \page licenses.html \title Licenses for Code Used in Qt Qt contains a little code that is not under the \link license.html QPL\endlink, the \link gpl.html GPL\endlink, or the Qt Commercial License Agreement, but rather under specific highly permissive licenses from the original authors. This page lists the licenses used for that code, names the authors, and links to the points where it is used. Trolltech gratefully acknowledges these and others contribution to Qt. We recommend that all programs that use Qt also acknowledge these contributions, and quote all these license statements in an appendix to the documentation. \legaleselist */ /*! \page geometry.html \title Window Geometry \section1 Overview QWidget provides several functions that deal with a widget's geometry. Some of these functions operate on the pure client area (i.e. the window excluding the window frame), others include the window frame. The differentiation is done in a way that covers the most common usage transparently. \table \row \i Including the window frame: \i x(), y(), frameGeometry(), pos() and move() \row \i Excluding the window frame: \i geometry(), width(), height(), rect() and size() \endtable Note that the distinction only matters for decorated top-level widgets. For all child widgets, the frame geometry is equal to the widget's client geometry. This diagram shows most of the functions in use: \img geometry.png Geometry diagram \section1 Unix/X11 peculiarities On Unix/X11, a window does not have a frame until the window manager decorates it. This happens asynchronously at some point in time after calling show() and the first paint event the window receives: or it does not happen at all. Bear in mind that X11 is policy-free (others call it flexible). Thus you cannot make any safe assumption about the decoration frame your window will get. Basic rule: there's always one user who uses a window manager that breaks your assumption, and who will complain to you. Furthermore, a toolkit cannot simply place windows on the screen. All Qt can do is to send certain hints to the window manager. The window manager, a separate process, may either obey, ignore or misunderstand them. Due to the partially unclear Inter-Client Communication Conventions Manual (ICCCM), window placement is handled quite differently in existing window managers. X11 provides no standard or easy way to get the frame geometry once the window is decorated. Qt solves this problem with nifty heuristics and clever code that works on a wide range of window managers that exist today. Don't be surprised if you find one where frameGeometry() returns bogus results though. Nor does X11 provide a way to maximize a window. The showMaximized() function in Qt therefore has to emulate the feature. Its result depends on the result of frameGeometry() and the capability of the window manager to do proper window placement, neither of which can be guaranteed. \section1 Restoring a Window's Geometry A common task in modern applications is to restore a window's geometry in a later session. On Windows, this is basically storing the result of geometry() and calling setGeometry() in the next session before calling show(). On X11, this won't work because an invisible window doesn't have a frame yet. The window manager would decorate the window later. When this happens, the window shifts towards the bottom/right corner of the screen depending on the size of the decoration frame. X theoretically provides a way to avoid this shift. Our tests have shown, though, that almost all window managers fail to implement this feature. A workaround is to call setGeometry() after show(). This has the two disadvantages that the widget appears at a wrong place for a millisecond (results in flashing) and that currently only every second window manager gets it right. A safer solution is to store both pos() and size() and to restore the geometry using resize() and move() before calling show(), as demonstrated in the following example: \code MyWidget* widget = new MyWidget ... QPoint p = widget->pos(); // store position QSize s = widget->size(); // store size ... widget = new MyWidget; widget->resize( s ); // restore size widget->move( p ); // restore position widget->show(); // show widget \endcode This method works on both MS-Windows and most existing X11 window managers. */