wxPython in Action (2006).pdf

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文件名称：wxPython in Action (2006).pdf
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wxPython Application Development Cookbook  Action The wxPython part of the story actually begins in 1995, with Harri Pasanen and Robin Dunn. Robin, who is one of the co-authors of the book, wrote the following about the history of wxPython, and we decided that it was a story better told in his own voice than paraphrased: In 1995 I was working on a project that needed a GUI to be deployed on HP-UX systems, but my boss also wanted to show something at a trade show on his Windows 3.1 laptop in a few weeks’ time. So I started searching for a cross platform C++ GUI toolkit to do a prototype with. In those days it wasn’t easy without Google, but I found that there were several commercial alternatives available (none of which is still available today) and lots of tool- kits with freely available source. While evaluating each of the free toolkits for my immediate needs and deciding which of the commercial offerings would be best for our long-term needs, I ran into the term “Python bindings” on the wxWidgets website (in this case “binding” refers to the connection between the Python language and the wxWidgets toolkit). Full of curiosity at how one would “bind” a soft- ware toolkit to a reptile (I had never heard of the Python language up to this point), I clicked on the link, and the next link, and the next, until I finally ended up at the Python 1.2 Tutorial document. Three hours later I was con- verted from being the local C++ guru to a Python evangelist bugging all xx PREFACE the developers in the immediate vicinity and showing them the cool new thing I had discovered. Instead of working on my prototype, I started working with Harri Pasanen in Finland to advance the Python bindings for wxWidgets, otherwise known as wxPython 0.2, with some help from Edward Zimmerman. The mailing list announcement of that release is archived here: (http://www.google.com/ groups?selm=[e-mail]&oe=UTF-8). We got it to be functional enough that I could build the prototype for my boss using Python, but wxPython was a nightmare to maintain and to enhance because everything (C++ extension module code, Python proxy modules, build system, etc.) was done by hand, and little changes or enhancements to wxWidgets would often require changes to several places in wxPython code to add the support for the enhancement or fix to wxPython. When it reached many tens of thousands of lines of code it became very awkward and fragile to continue working in that manner. Add to that the fact that there was no central source code repository (this was also before SourceForge’s time) so we were emailing code changes to each other—you can get an inkling of the difficulties involved. About that time, I had to start doing “real” work again as my main project was building up from a gleam in the eye to a full-force development project with several developers under my control with design meetings and deadlines, and I found myself fully back in the C++ world again, although I was able to use Python for some of the build and test scripts for the project. Harri wasn’t able to spend any time on it either, so wxPython development slowed to less than a crawl and eventually stopped. In 1997 I discovered SWIG (Simple Wrapper and Interface Generator), and realized that it could help with all the maintenance issues that had pained us in the wxPython project. In three or four weeks of spare time using SWIG, I almost completely reimplemented everything in wxPython that had taken several weeks of full-time work on my part and several months of part-time work for Harri doing it by hand. After getting sidetracked on another project for a while, I discovered that wxWidgets 2.0 was in active develop- ment, but had a whole new architecture, so I had to do it all again. But this time the new architecture simplified things enough that it took only about a week’s worth of spare time! So in the summer of 1998 the first “modern ver- sion” of wxPython was released and has been in active development ever PREFACE xxi since. The first announcement is archived here: (http://groups.yahoo.com/ group/python-announce-list/message/95). The rest is, as they say, history. It’s important to note that SWIG is allowing me to easily create and maintain literally hundreds of thousands of lines of code, so much of the credit for the vastness of wxPython’s feature set deserves to go to David Beazley and the other developers contributing to that project. With this book, we hope to share with you our excitement about wxPython, a toolkit that is truly unique in the ease that it brings to GUI application develop- ment. We wrote it with the goal of creating a useful resource for both the novice and the pro.