X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/bd0df01f3f59940fdbca7a3472c256be2d034ab9..acbd13a365fe2bd7ed6bafd19dc26775a256d499:/docs/latex/wx/body.tex diff --git a/docs/latex/wx/body.tex b/docs/latex/wx/body.tex index 9289217d6d..b78e3f6c25 100644 --- a/docs/latex/wx/body.tex +++ b/docs/latex/wx/body.tex @@ -7,7 +7,8 @@ wxWindows is a C++ framework providing GUI (Graphical User Interface) and other facilities on more than one platform. Version 2.0 currently -supports subsets MS Windows (16-bit, Windows 95 and Windows NT) and GTK. +supports MS Windows (16-bit, Windows 95 and Windows NT) and GTK+, with Motif +and Mac ports in an advanced state. wxWindows was originally developed at the Artificial Intelligence Applications Institute, University of Edinburgh, for internal use. @@ -28,7 +29,7 @@ variants, unless otherwise stated. All trademarks are acknowledged. wxWindows was developed to provide a cheap and flexible way to maximize investment in GUI application development. While a number of commercial -class libraries already exist for cross-platform development, +class libraries already existed for cross-platform development, none met all of the following criteria: \begin{enumerate}\itemsep=0pt @@ -38,25 +39,24 @@ none met all of the following criteria: \item support for a wide range of compilers. \end{enumerate} +Since wxWindows was started, several other free or almost-free GUI frameworks have +emerged. However, none has the range of features, flexibility, documentation and the +well-established development team that wxWindows has. + As public domain software and a project open to everyone, wxWindows has benefited from comments, ideas, bug fixes, enhancements and the sheer enthusiasm of users, especially via the Internet. This gives wxWindows a -certain advantage over its commercial brothers, and a robustness against +certain advantage over its commercial competitors (and over free libraries +without an independent development team), plus a robustness against the transience of one individual or company. This openness and availability of source code is especially important when the future of thousands of lines of application code may depend upon the longevity of the underlying class library. -In writing wxWindows, completeness has sometimes been traded for -portability and simplicity of programming. Version 2.0 goes much -further than previous versions in terms of generality and features, +Version 2.0 goes much further than previous versions in terms of generality and features, allowing applications to be produced that are often indistinguishable from those produced using single-platform -toolkits -such as Motif and MFC. - -wxWindows 2.0 currently maps to two native APIs: GTK and -MS Windows. Motif, Xt and Mac ports are also in preparation. +toolkits such as Motif and MFC. The importance of using a platform-independent class library cannot be overstated, since GUI application development is very time-consuming, @@ -64,10 +64,9 @@ and sustained popularity of particular GUIs cannot be guaranteed. Code can very quickly become obsolete if it addresses the wrong platform or audience. wxWindows helps to insulate the programmer from these winds of change. Although wxWindows may not be suitable for -every application, it provides access to most of the functionality a -GUI program normally requires, plus some extras such as form -construction, interprocess communication and PostScript output, and -can of course be extended as needs dictate. As a bonus, it provides +every application (such as an OLE-intensive program), it provides access to most of the functionality a +GUI program normally requires, plus some extras such as network programming +and PostScript output, and can of course be extended as needs dictate. As a bonus, it provides a cleaner programming interface than the native APIs. Programmers may find it worthwhile to use wxWindows even if they are developing on only one platform. @@ -78,24 +77,28 @@ here are some of the benefits: \begin{itemize}\itemsep=0pt \item Low cost (free, in fact!) \item You get the source. +\item Available on a variety of popular platforms. +\item Works with almost all popular C++ compilers. \item Several example programs. \item Over 700 pages of printable and on-line documentation. +\item Includes Tex2RTF, to allow you to produce your own documentation +in Windows Help, HTML and Word RTF formats. \item Simple-to-use, object-oriented API. -\item Graphics calls include splines, polylines, rounded rectangles, etc. +\item Flexible event system. +\item Graphics calls include lines, rounded rectangles, splines, polylines, etc. \item Constraint-based layout option. \item Print/preview and document/view architectures. -\item Status line facility, toolbar -\item Easy, object-oriented interprocess comms (DDE subset) under Unix and -MS Windows. -\item Encapsulated PostScript generation under Unix, normal MS Windows printing on the +\item Toolbar, notebook, tree control, advanced list control classes. +\item PostScript generation under Unix, normal MS Windows printing on the PC. -\item MDI support under Windows and GTK. -\item Can be used to create DLLs under Windows, dynamic libraries on the Sun. +\item MDI (Multiple Document Interface) support. +\item Can be used to create DLLs under Windows, dynamic libraries on Unix. \item Common dialogs for file browsing, printing, colour selection, etc. \item Under MS Windows, support for creating metafiles and copying them to the clipboard. -\item Hypertext help facility, with an API for invocation from applications. +\item An API for invoking help from applications. \item Dialog Editor for building dialogs. +\item Network support via a family of socket and protocol classes. \end{itemize} \section{Changes from version 1.xx}\label{versionchanges} @@ -106,9 +109,8 @@ Removals: \begin{itemize}\itemsep=0pt \item XView is no longer supported; -\item Mac is not yet supported; \item all controls (panel items) no longer have labels attached to them; -\item wxForm removed; +\item wxForm has been removed; \item wxCanvasDC, wxPanelDC removed (replaced by wxClientDC, wxWindowDC, wxPaintDC which can be used for any window); \item wxMultiText, wxTextWindow, wxText removed and replaced by wxTextCtrl; @@ -171,7 +173,9 @@ following setups. \begin{enumerate}\itemsep=0pt \item A 486 or higher PC running MS Windows. -\item One of Microsoft Visual C++ 4.0 or higher, Borland C++, Gnu-Win32. +\item A Windows compiler: most are supported, but please see {\tt install.txt} for +details. Supported compilers include Microsoft Visual C++ 4.0 or higher, Borland C++, Cygwin, +Metrowerks CodeWarrior. \item At least 60 MB of disk space. \end{enumerate} @@ -179,7 +183,7 @@ following setups. \begin{enumerate}\itemsep=0pt \item Almost any C++ compiler, including GNU C++. -\item Almost any Unix workstation, and GTK 1.0 or higher. +\item Almost any Unix workstation, and one of: GTK+ 1.0, Motif 1.2 or higher, Lesstif. \item At least 60 MB of disk space. \end{enumerate} @@ -189,14 +193,14 @@ wxWindows is currently available from the Artificial Intelligence Applications Institute by anonymous FTP and World Wide Web: \begin{verbatim} - ftp://ftp.aiai.ed.ac.uk/pub/packages/wxwin + ftp://www.remstar.com/pub/wxwin http://web.ukonline.co.uk/julian.smart/wxwin \end{verbatim} \section{Acknowledgments} Thanks are due to AIAI for being willing to release the original version of -wxWindows into the public domain, and to our patient wives Harriet, Tanja and others. +wxWindows into the public domain, and to our patient partners. We would particularly like to thank the following for their contributions to wxWindows, and the many others who have been involved in the project over the years. Apologies for any unintentional omissions from this list. @@ -277,95 +281,33 @@ multi-megabyte .pch files. \section{Libraries} -Please the wxGTK documentation for use of the Unix version of wxWindows. +Please the wxGTK or wxMotif documentation for use of the Unix version of wxWindows. Under Windows, use the library wx.lib for stand-alone Windows applications, or wxdll.lib for creating DLLs. \section{Configuration} -The following lists the options configurable in the file -\rtfsp{\tt "wx/msw/setup.h"} and {\tt "wx/gtk/setup.h"} Some settings are a matter +Options are configurable in the file +\rtfsp{\tt "wx/XXX/setup.h"} where XXX is the required platform (such as msw, motif, gtk, mac). Some settings are a matter of taste, some help with platform-specific problems, and -others can be set to minimize the size of the library. - -\subsection{General features} - -\begin{twocollist}\itemsep=0pt -\twocolitem{USE\_CLIPBOARD}{If 1, clipboard code is compiled (Windows only).} -\twocolitem{USE\_CONSTRAINTS}{If 1, the constaint-based window layout system is compiled.} -\twocolitem{USE\_DOC\_VIEW\_ARCHITECTURE}{If 1, wxDocument, wxView and related classes are compiled.} -\twocolitem{USE\_DYNAMIC\_CLASSES}{If 1, the run-time class macros and classes are compiled. Recommended, -and necessary for the document/view framework.} -\twocolitem{USE\_HELP}{If 1, interface to help system is compiled.} -\twocolitem{USE\_GAUGE}{If 1, the wxGauge class compiled.} -\twocolitem{USE\_GLOBAL\_MEMORY\_OPERATORS}{If 1, redefines global new and delete operators to be compatible -with the extended arguments of the debugging wxObject new and delete operators. If this causes problems -for your compiler, set to 0.} -\twocolitem{USE\_IPC}{If 1, interprocess communication code is compiled.} -\twocolitem{USE\_MEMORY\_TRACING}{If 1, enables debugging versions of wxObject::new and wxObject::delete -if the value of DEBUG is defined to more than 0.} -\twocolitem{USE\_METAFILE}{If 1, Windows Metafile code is compiled.} -\twocolitem{USE\_POSTSCRIPT}{If 1, PostScript code is compiled.} -\twocolitem{USE\_POSTSCRIPT\_ARCHITECTURE\_IN\_MSW}{Set to 1 to enable the printing architecture -to make use of either native Windows printing facilities, or the wxPostScriptDC class depending -on the wxApp::SetPrintMode setting.} -\twocolitem{USE\_PRINTING\_ARCHITECTURE}{If 1, wxPrinter, wxPrintout and related classes are compiled -for the print/preview framework.} -\twocolitem{USE\_RESOURCES}{If 1, win.ini or .Xdefaults-style resource read/write code is compiled.} -\twocolitem{USE\_WX\_RESOURCES}{If 1, wxWindows resource file (.WXR) code is compiled.} -\end{twocollist} - -\subsection{Windows and NT features} - -\begin{twocollist} -\twocolitem{CTL3D}{CTL3D should only be used for 16-bit Windows programs. -On Windows 95 and NT, native 3D effects are used. If you want to -use it and don't already have CTL3D installed, copy the files in -contrib/ctl3d to appropriate places (ctl3dv2.lib/ctl3d32.lib into your compiler lib -directory, ctl3d.h into an include directory, and ctl3dv2.dll into -windows/system). You may need to find a compiler-specific version of ctl3dv2.lib -or ctl3d32.lib. Define CTL3D to be 1 in wx\_setup.h and link your executables with ctl3dv2.lib -or ctl3d32.lib.} -\twocolitem{USE\_ODBC}{If 1, compiles wxDatabase and wxRecordSet classes for ODBC -access. Requires sql.h, sqlext.h files if set to 1 (see topic on database support).} -\end{twocollist} +others can be set to minimize the size of the library. Please see the setup.h file +and {\tt install.txt} files for details on configuration. \section{Makefiles} At the moment there is no attempt to make Unix makefiles and PC makefiles compatible, i.e. one makefile is required for -each environment. +each environment. wxGTK has its own configure system which can also +be used with wxMotif, although wxMotif has a simple makefile system of its own. Sample makefiles for Unix (suffix .UNX), MS C++ (suffix .DOS and .NT), Borland -C++ (.BCC) and Symantec C++ (.SC) are included for the library, demos -and utilities. The NT, Borland and Symantec makefiles cannot be -guaranteed to be up-to-date since the author does not have -these compilers. +C++ (.BCC and .B32) and Symantec C++ (.SC) are included for the library, demos +and utilities. The controlling makefile for wxWindows is in the platform-specific -directory, such as {\tt src/msw} or {\tt src/x}. This makefile will -recursively execute the makefile in {\tt src/base}. - -\subsection{Windows makefiles} - -For Microsoft C++, normally it is only necessary to type {\tt nmake -f -makefile.dos} (or an alias or batch file which does this). By default, -binaries are made with debugging information, and no optimization. Use -FINAL=1 on the command line to remove debugging information (this only -really necessary at the link stage), and DLL=1 to make a DLL version of -the library, if building a library. - -\subsection{Unix makefiles} - -TODO. +directory, such as {\tt src/msw} or {\tt src/motif}. -Debugging information is included by default; you may add DEBUG= as an -argument to make to compile without it, or use the Unix {\bf strip} -command to remove debugging information from an executable. - -\normalbox{{\it Important note:} Most compiler flags are kept centrally in -src/make.env, which is included by all other makefiles. This is the -file to edit to tailor wxWindows compilation to your environment.} +Please see the platform-specific {\tt install.txt} file for further details. \section{Windows-specific files} @@ -449,77 +391,44 @@ fine on some platforms, and then fail under Windows. One of the purposes of wxWindows is to reduce the need for conditional compilation in source code, which can be messy and confusing to follow. However, sometimes it is necessary to incorporate platform-specific -features (such as metafile use under MS Windows). The following identifiers -may be used for this purpose, along with any user-supplied ones: +features (such as metafile use under MS Windows). The symbols +listed in the file {\tt symbols.txt} may be used for this purpose, +along with any user-supplied ones. -{\bf GUIs:} +\section{C++ issues} -\begin{verbatim} -__X__ any X, but not GTK -__WXMOTIF__ Motif -__WXGTK__ GTK -__WXMSW__ Any Windows -__MAC__ MacOS -__UNIX__ any Unix -__WIN95__ GUI for Windows 95 and above; NT 4.0 and above. -__WIN32__ WIN32 API -__NT__ Windows NT -__CURSES__ CURSES -\end{verbatim} +The following documents some miscellaneous C++ issues. + +\subsection{Templates} -{\bf OSes:} +wxWindows does not use templates since it is a notoriously unportable feature. -\begin{verbatim} -__HPUX__ -__SVR4__ -__SYSV__ -__LINUX__ -__SGI__ -__ULTRIX__ -__BSD__ -__VMS__ -__SUN__ Any Sun -__SUNOS__ -__SOLARIS__ -__ALPHA__ -__AIX__ -__DATA_GENERAL__ -__OSF__ -__FREEBSD__ -\end{verbatim} +\subsection{RTTI} -{\bf Compilers:} +wxWindows does not use run-time type information since wxWindows provides +its own run-time type information system, implemented using macros. -\begin{verbatim} -__GNUWIN32__ Gnu-Win32 compiler -__DJGPP__ DJGPP -__GNUG__ Gnu C++ on any platform -__BORLANDC__ Borland C++ -__WATCOMC__ Watcom C++ -__SYMANTECC__ Symantec C++ -__VISUALC__ VC++ -__SUNCC__ -\end{verbatim} +\subsection{Type of NULL} -{\bf wxWindows modes:} +Some compilers (e.g. the native IRIX cc) define NULL to be 0L so that +no conversion to pointers is allowed. Because of that, all these +occurences of NULL in the GTK port use an explicit conversion such +as +{\small \begin{verbatim} -__WXDEBUG__ usage: #ifdef __DEBUG__ (=> debug mode, else => release) + wxWindow *my_window = (wxWindow*) NULL; \end{verbatim} +} -\section{C++ issues} - -The following documents some miscellaneous C++ issues. - -\subsection{Templates} - -wxWindows does not use templates since it is a notoriously unportable feature. +It is recommended to adhere to this in all code using wxWindows as +this make the code (a bit) more portable. \subsection{Precompiled headers} Some compilers, such as Borland C++ and Microsoft C++, support precompiled headers. This can save a great deal of compiling time. The -recommended approach is to precompile {\tt ``wx.h''}, using this +recommended approach is to precompile {\tt "wx.h"}, using this precompiled header for compiling both wxWindows itself and any wxWindows applications. For Windows compilers, two dummy source files are provided (one for normal applications and one for creating DLLs) @@ -529,8 +438,7 @@ However, there are several downsides to using precompiled headers. One is that to take advantage of the facility, you often need to include more header files than would normally be the case. This means that changing a header file will cause more recompilations (in the case of -wxWindows, everything needs to be recompiled since everything includes -{\tt ``wx.h''}!) +wxWindows, everything needs to be recompiled since everything includes {\tt "wx.h"}!) A related problem is that for compilers that don't have precompiled headers, including a lot of header files slows down compilation @@ -552,7 +460,7 @@ approach is to store filenames on their own, with no directory information. The application searches through a number of locally defined directories to find the file. To support this, the class {\bf wxPathList} makes adding directories and searching for files easy, and -the global function {\bf FileNameFromPath} allows the application to +the global function {\bf wxFileNameFromPath} allows the application to strip off the filename from the path if the filename must be stored. This has undesirable ramifications for people who have documents of the same name in different directories. @@ -572,6 +480,7 @@ dos2unix). See also the File Functions section of the reference manual for descriptions of miscellaneous file handling functions. +\begin{comment} \chapter{Utilities supplied with wxWindows}\label{utilities} \setheader{{\it CHAPTER \thechapter}}{}{}{}{}{{\it CHAPTER \thechapter}}% \setfooter{\thepage}{}{}{}{}{\thepage}% @@ -579,8 +488,9 @@ descriptions of miscellaneous file handling functions. A number of `extras' are supplied with wxWindows, to complement the GUI functionality in the main class library. These are found below the utils directory and usually have their own source, library -and documentation directories. For larger user-contributed packages, -see the directory /pub/packages/wxwin/contrib. +and documentation directories. For other user-contributed packages, +see the directory ftp://www.remstar.com/pub/wxwin/contrib, which is +more easily accessed via the Contributions page on the Web site. \section{wxHelp}\label{wxhelp} @@ -676,6 +586,7 @@ platform. \setfooter{\thepage}{}{}{}{}{\thepage}% To be written. +\end{comment} \chapter{Programming strategies}\label{strategies} \setheader{{\it CHAPTER \thechapter}}{}{}{}{}{{\it CHAPTER \thechapter}}% @@ -714,8 +625,7 @@ The same goes for other data types: use classes wherever possible. Don't use absolute panel item positioning if you can avoid it. Different GUIs have very differently sized panel items. Consider using the constraint system, although this -can be complex to program. If you needs are simple, the default relative positioning -behaviour may be adequate (using default position values and wxPanel::NewLine). +can be complex to program. Alternatively, you could use alternative .wrc (wxWindows resource files) on different platforms, with slightly different dimensions in each. Or space your panel items out @@ -727,7 +637,7 @@ Use .wrc (wxWindows resource files) where possible, because they can be easily c independently of source code. Bitmap resources can be set up to load different kinds of bitmap depending on platform (see the section on resource files). -\section{Strategies for debugging} +\section{Strategies for debugging}\label{debugstrategies} \subsection{Positive thinking} @@ -756,49 +666,35 @@ to go from functioning to non-functioning state. This should give a clue to the problem. In some cases though, such as memory leaks or wrong deallocation, this can still give totally spurious results! -\subsection{Genetic mutation} - -If we had sophisticated genetic algorithm tools that could be applied -to programming, we could use them. Until then, a common -- if rather irrational -- -technique is to just make arbitrary changes to the code until something -different happens. You may have an intuition why a change will make a difference; -otherwise, just try altering the order of code, comment lines out, anything -to get over an impasse. Obviously, this is usually a last resort. - \subsection{Use a debugger} This sounds like facetious advice, but it's surprising how often people don't use a debugger. Often it's an overhead to install or learn how to use a debugger, but it really is essential for anything but the most -trivial programs. Some platforms don't allow for debugging, such -as WIN32s under Windows 3.x. In this case, you might be advised to -debug under 16-bit Windows and when you're confident, compile for -WIN32s. In fact WIN32s can be very strict about bad memory handling, -so testing out under WIN32s is a good thing to do even if you're -not going to distribute this version. (Unless you've got a good memory checking, -utility, of course!) Tracking bugs under WIN32s can involve a lot of debug message -insertion and relinking, so make sure your compiler has a fast linker -(e.g. Watcom, Symantec). - -\subsection{Use tracing code} - -You can use wxDebugMsg statements (or the wxDebugStreamBuf class) to -output to a debugging window such as DBWIN under Windows, or standard -error under X. If compiling in DEBUG mode, you can use TRACE statements -that will be compiled out of the final build of your application. +trivial programs. + +\subsection{Use logging functions} + +There is a variety of logging functions that you can use in your program: +see \helpref{Logging functions}{logfunctions}. Using tracing statements may be more convenient than using the debugger in some circumstances (such as when your debugger doesn't support a lot of debugging code, or you wish to print a bunch of variables). -\subsection{Use wxObject::Dump and the wxDebugContext class} +\subsection{Use the wxWindows debugging facilities} -It's good practice to implement the Dump member function for all -classes derived from wxObject. You can then make use of wxDebugContext -to dump out information on all objects in the program, if DEBUG is -defined to be more than zero. You can use wxDebugContext to check for -memory leaks and corrupt memory. See the debugging topic in the -reference manual for more information. +You can use wxDebugContext to check for +memory leaks and corrupt memory: in fact in debugging mode, wxWindows will +automatically check for memory leaks at the end of the program if wxWindows is suitably +configured. Depending on the operating system and compiler, more or less +specific information about the problem will be logged. + +You should also use \helpref{debug macros}{debugmacros} as part of a `defensive programming' strategy, +scattering wxASSERTs liberally to test for problems in your code as early as possible. Forward thinking +will save a surprising amount of time in the long run. + +See the \helpref{debugging overview}{debuggingoverview} for further information. \subsection{Check Windows debug messages} @@ -811,3 +707,13 @@ more problems. However, I doubt it's worth the hassle for most applications. wxWindows is designed to minimize the possibility of such errors, but they can still happen occasionally, slipping through unnoticed because they are not severe enough to cause a crash. + +\subsection{Genetic mutation} + +If we had sophisticated genetic algorithm tools that could be applied +to programming, we could use them. Until then, a common -- if rather irrational -- +technique is to just make arbitrary changes to the code until something +different happens. You may have an intuition why a change will make a difference; +otherwise, just try altering the order of code, comment lines out, anything +to get over an impasse. Obviously, this is usually a last resort. +