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1 | <?xml version="1.0" encoding="iso-8859-1" ?> |
2 | <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> | |
3 | <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en"> | |
4 | <head> | |
5 | <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" /> | |
c66cd08a | 6 | <meta name="generator" content="Docutils 0.3.7: http://docutils.sourceforge.net/" /> |
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7 | <title>The wxPython wx Package</title> |
8 | <meta name="author" content="Patrick K. O'Brien" /> | |
9 | <meta name="author" content="Robin Dunn" /> | |
10 | <meta name="organization" content="Orbtech" /> | |
7fa23c09 | 11 | <meta name="date" content="2004-03-26" /> |
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12 | <link rel="stylesheet" href="default.css" type="text/css" /> |
13 | </head> | |
14 | <body> | |
15 | <div class="document" id="the-wxpython-wx-package"> | |
16 | <h1 class="title">The wxPython wx Package</h1> | |
17 | <h2 class="subtitle" id="or-how-to-survive-the-new-wx-namespace-changes">Or, how to survive the new wx namespace changes.</h2> | |
18 | <table class="docinfo" frame="void" rules="none"> | |
19 | <col class="docinfo-name" /> | |
20 | <col class="docinfo-content" /> | |
21 | <tbody valign="top"> | |
22 | <tr><th class="docinfo-name">Author:</th> | |
23 | <td>Patrick K. O'Brien</td></tr> | |
24 | <tr><th class="docinfo-name">Author:</th> | |
25 | <td>Robin Dunn</td></tr> | |
26 | <tr><th class="docinfo-name">Contact:</th> | |
27 | <td><a class="first last reference" href="mailto:pobrien@orbtech.com">pobrien@orbtech.com</a></td></tr> | |
28 | <tr><th class="docinfo-name">Organization:</th> | |
29 | <td><a class="first last reference" href="http://www.orbtech.com/">Orbtech</a></td></tr> | |
30 | <tr><th class="docinfo-name">Date:</th> | |
7fa23c09 | 31 | <td>2004-03-26</td></tr> |
8eda5e35 | 32 | <tr><th class="docinfo-name">Revision:</th> |
7fa23c09 | 33 | <td>1.4</td></tr> |
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34 | </tbody> |
35 | </table> | |
36 | <div class="contents topic" id="contents"> | |
c66cd08a | 37 | <p class="topic-title first"><a name="contents">Contents</a></p> |
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38 | <ul class="simple"> |
39 | <li><a class="reference" href="#introduction" id="id2" name="id2">Introduction</a></li> | |
40 | <li><a class="reference" href="#why-change-anything" id="id3" name="id3">Why change anything?</a></li> | |
41 | <li><a class="reference" href="#what-does-the-new-wx-package-do" id="id4" name="id4">What does the new wx package do?</a></li> | |
42 | <li><a class="reference" href="#will-any-of-this-effect-my-existing-code" id="id5" name="id5">Will any of this effect my existing code?</a></li> | |
43 | <li><a class="reference" href="#what-about-all-the-other-modules-like-grid-html-and-stc" id="id6" name="id6">What about all the other modules, like grid, html, and stc?</a></li> | |
44 | <li><a class="reference" href="#how-do-i-use-this-new-wx-package" id="id7" name="id7">How do I use this new wx package?</a></li> | |
45 | <li><a class="reference" href="#what-are-the-issues-with-converting-old-code-to-use-the-new-wx-package" id="id8" name="id8">What are the issues with converting old code to use the new wx package?</a></li> | |
46 | <li><a class="reference" href="#where-can-i-find-example-programs-using-the-new-wx-syntax" id="id9" name="id9">Where can I find example programs using the new wx syntax?</a></li> | |
47 | </ul> | |
48 | </div> | |
49 | <div class="section" id="introduction"> | |
50 | <h1><a class="toc-backref" href="#id2" name="introduction">Introduction</a></h1> | |
51 | <p>In the begining there was Python, and Python had modules, and Python | |
52 | was good. But after a time Guido looked on Python and saw that Python | |
53 | needed organizational assistance, and so Guido took code from Python's | |
54 | side and created Packages and then Python was very good. About this | |
55 | time wxPython was reborn, and wxPython used Packages, but being young | |
56 | and trying to use a new technology wxPython did not know how to use | |
57 | Packages effectivly. wxPython was good, but dreamed of being much | |
58 | better...</p> | |
59 | <p>Now many years later, after tons of code reorganization and build | |
60 | hacking wxPython has reached that goal. In version 2.4.1 a prototype | |
61 | of this new structure was introduced that dynamically built at import | |
62 | time a new toplevel package named simply "wx" that contained all the | |
63 | items from wxPython.wx but with the names edited to remove the wx | |
64 | prefix. Now in 2.5 the final phase of that switcheroo has been | |
65 | completed and the <em>real</em> classes, functions and constants are now | |
66 | located in the wx package, leaving some compatibility modules in | |
67 | wxPython.wx. This document should answer all the questions you might | |
68 | have concerning the new wx package. Please also take a look at the | |
69 | <a class="reference" href="MigrationGuide.html">2.5 Migration Guide</a> to see notes about other big differences in | |
70 | this release.</p> | |
71 | </div> | |
72 | <div class="section" id="why-change-anything"> | |
73 | <h1><a class="toc-backref" href="#id3" name="why-change-anything">Why change anything?</a></h1> | |
74 | <p>This change is being made for a couple of reasons. The first reason | |
c66cd08a | 75 | is to discourage the use of <tt class="docutils literal"><span class="pre">import</span> <span class="pre">*</span></tt>, which is a dangerous |
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76 | technique that can create name conflicts and bloated namespaces.</p> |
77 | <p>The second reason is to remove what some perceive to be a "wart." For | |
78 | example, the following code is rather ugly in that the "wx" prefix on | |
79 | the wxFrame class name is no longer useful when you're using the wx | |
80 | module prefix:</p> | |
81 | <pre class="literal-block"> | |
82 | from wxPython import wx | |
83 | ||
84 | class Frame(wx.wxFrame) | |
85 | </pre> | |
86 | <p>The new wx package allows you to write code like this, instead:</p> | |
87 | <pre class="literal-block"> | |
88 | import wx | |
89 | ||
90 | class Frame(wx.Frame) | |
91 | </pre> | |
92 | <p>The third reason is that the wxWindows project has considered doing | |
93 | the same thing (implement a new wx namespace and drop the "wx" prefix) | |
94 | and we want wxPython to lead the way.</p> | |
95 | </div> | |
96 | <div class="section" id="what-does-the-new-wx-package-do"> | |
97 | <h1><a class="toc-backref" href="#id4" name="what-does-the-new-wx-package-do">What does the new wx package do?</a></h1> | |
98 | <p>As mentioned in the Introduction, wxPython 2.4.1 introduced a way of | |
99 | getting to this new syntax as quickly as possible. It would import | |
100 | the old names (like "wxFrame") from the old package and then create new | |
101 | names in the wx package without the wx prefix, (like "Frame".) | |
102 | Starting with wxPython 2.5 the renaming is moved up to the wxPython | |
103 | build step, so the real classes and etc. are actually named with the | |
104 | new name (like "Frame") and are located in the new wx package.</p> | |
105 | <p>For compatibility the old wxPython package still exists, but now it is | |
106 | populated with modules that simply import the new names and then | |
107 | "reverse-renames" them to the old names. It probably sounds a bit | |
108 | complicated, but it is mostly automated and so it doesn't cause | |
109 | problems in most cases.</p> | |
110 | </div> | |
111 | <div class="section" id="will-any-of-this-effect-my-existing-code"> | |
112 | <h1><a class="toc-backref" href="#id5" name="will-any-of-this-effect-my-existing-code">Will any of this effect my existing code?</a></h1> | |
113 | <p>No. Your existing code will continue to work and be supported for | |
114 | some time. It will be up to you to decide when to switch to the new | |
115 | syntax. But all new documentation and code examples will use the new | |
116 | syntax. So don't wait too long. You wouldn't want anyone calling you | |
117 | old-fashioned, would you?</p> | |
118 | <p>When you import from wxPython.wx and use a class with the old name, | |
119 | such as wxButton, you are actually using the wx.Button class. I | |
120 | expect that the vast majority of the existing code should work fine | |
121 | using this scheme. The only things that may cause problems is if your | |
122 | old code is depending on some of the implemtation details, or if you | |
123 | are using other things that have changed in the API. See the | |
124 | <a class="reference" href="MigrationGuide.html">Migration Guide</a> for more details.</p> | |
125 | </div> | |
126 | <div class="section" id="what-about-all-the-other-modules-like-grid-html-and-stc"> | |
127 | <h1><a class="toc-backref" href="#id6" name="what-about-all-the-other-modules-like-grid-html-and-stc">What about all the other modules, like grid, html, and stc?</a></h1> | |
128 | <p>There's more to the old wxPython than just the wxPython.wx module. | |
129 | And we've got those extra modules covered as well. Each of those | |
130 | modules (as well as the lib subpackage) has been moved to the new wx | |
131 | package and reverse-renamers have been placed in the wxPython package | |
132 | as needed.</p> | |
133 | </div> | |
134 | <div class="section" id="how-do-i-use-this-new-wx-package"> | |
135 | <h1><a class="toc-backref" href="#id7" name="how-do-i-use-this-new-wx-package">How do I use this new wx package?</a></h1> | |
136 | <p>The wx package is automatically created when you install wxPython | |
137 | version 2.4.1 or higher. So all you have to do is:</p> | |
138 | <pre class="literal-block"> | |
139 | import wx | |
140 | </pre> | |
141 | </div> | |
142 | <div class="section" id="what-are-the-issues-with-converting-old-code-to-use-the-new-wx-package"> | |
143 | <h1><a class="toc-backref" href="#id8" name="what-are-the-issues-with-converting-old-code-to-use-the-new-wx-package">What are the issues with converting old code to use the new wx package?</a></h1> | |
144 | <p>Obviously, you need to change your import statements from:</p> | |
145 | <pre class="literal-block"> | |
146 | from wxPython import wx | |
147 | </pre> | |
148 | <p>or:</p> | |
149 | <pre class="literal-block"> | |
150 | from wxPython.wx import * | |
151 | </pre> | |
152 | <p>to:</p> | |
153 | <pre class="literal-block"> | |
154 | import wx | |
155 | </pre> | |
156 | <p>Then you need to refer to wx attributes without a "wx" prefix, such | |
157 | as:</p> | |
158 | <pre class="literal-block"> | |
159 | class MyFrame(wx.Frame): | |
160 | </pre> | |
161 | <p>In most cases, existing code can be modified with a simple search and | |
162 | replace.</p> | |
163 | </div> | |
164 | <div class="section" id="where-can-i-find-example-programs-using-the-new-wx-syntax"> | |
165 | <h1><a class="toc-backref" href="#id9" name="where-can-i-find-example-programs-using-the-new-wx-syntax">Where can I find example programs using the new wx syntax?</a></h1> | |
90805926 | 166 | <p>The wxPython demo application and most of the sample apps have been |
c66cd08a | 167 | converted to use the new <tt class="docutils literal"><span class="pre">import</span> <span class="pre">wx</span></tt> style of programming with |
90805926 | 168 | wxPython, so there are lots of examples to look at and to play with. |
c66cd08a | 169 | Here is one of them, it is the <tt class="docutils literal"><span class="pre">simple</span></tt> sample.</p> |
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170 | <pre class="literal-block"> |
171 | #---------------------------------------------------------------------- | |
60b517c1 RD |
172 | # A very simple wxPython example. Just a wx.Frame, wx.Panel, |
173 | # wx.StaticText, wx.Button, and a wx.BoxSizer, but it shows the basic | |
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174 | # structure of any wxPython application. |
175 | #---------------------------------------------------------------------- | |
176 | ||
177 | import wx | |
178 | ||
179 | ||
180 | class MyFrame(wx.Frame): | |
181 | """ | |
182 | This is MyFrame. It just shows a few controls on a wxPanel, | |
183 | and has a simple menu. | |
184 | """ | |
185 | def __init__(self, parent, title): | |
186 | wx.Frame.__init__(self, parent, -1, title, | |
187 | pos=(150, 150), size=(350, 200)) | |
188 | ||
189 | # Create the menubar | |
190 | menuBar = wx.MenuBar() | |
191 | ||
192 | # and a menu | |
193 | menu = wx.Menu() | |
194 | ||
195 | # add an item to the menu, using \tKeyName automatically | |
196 | # creates an accelerator, the third param is some help text | |
197 | # that will show up in the statusbar | |
198 | menu.Append(wx.ID_EXIT, "E&xit\tAlt-X", "Exit this simple sample") | |
199 | ||
200 | # bind the menu event to an event handler | |
201 | self.Bind(wx.EVT_MENU, self.OnTimeToClose, id=wx.ID_EXIT) | |
202 | ||
203 | # and put the menu on the menubar | |
204 | menuBar.Append(menu, "&File") | |
205 | self.SetMenuBar(menuBar) | |
206 | ||
207 | self.CreateStatusBar() | |
208 | ||
209 | ||
210 | # Now create the Panel to put the other controls on. | |
211 | panel = wx.Panel(self) | |
212 | ||
213 | # and a few controls | |
214 | text = wx.StaticText(panel, -1, "Hello World!") | |
215 | text.SetFont(wx.Font(14, wx.SWISS, wx.NORMAL, wx.BOLD)) | |
216 | text.SetSize(text.GetBestSize()) | |
217 | btn = wx.Button(panel, -1, "Close") | |
218 | funbtn = wx.Button(panel, -1, "Just for fun...") | |
219 | ||
220 | # bind the button events to handlers | |
221 | self.Bind(wx.EVT_BUTTON, self.OnTimeToClose, btn) | |
222 | self.Bind(wx.EVT_BUTTON, self.OnFunButton, funbtn) | |
223 | ||
224 | # Use a sizer to layout the controls, stacked vertically and with | |
225 | # a 10 pixel border around each | |
226 | sizer = wx.BoxSizer(wx.VERTICAL) | |
227 | sizer.Add(text, 0, wx.ALL, 10) | |
228 | sizer.Add(btn, 0, wx.ALL, 10) | |
229 | sizer.Add(funbtn, 0, wx.ALL, 10) | |
230 | panel.SetSizer(sizer) | |
231 | panel.Layout() | |
232 | ||
233 | ||
234 | def OnTimeToClose(self, evt): | |
235 | """Event handler for the button click.""" | |
236 | print "See ya later!" | |
237 | self.Close() | |
238 | ||
239 | def OnFunButton(self, evt): | |
240 | """Event handler for the button click.""" | |
241 | print "Having fun yet?" | |
242 | ||
243 | ||
244 | class MyApp(wx.App): | |
245 | def OnInit(self): | |
246 | frame = MyFrame(None, "Simple wxPython App") | |
90805926 | 247 | self.SetTopWindow(frame) |
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248 | |
249 | print "Print statements go to this stdout window by default." | |
250 | ||
251 | frame.Show(True) | |
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252 | return True |
253 | ||
60b517c1 | 254 | app = MyApp(redirect=True) |
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255 | app.MainLoop() |
256 | ||
257 | ||
258 | </pre> | |
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259 | </div> |
260 | </div> | |
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261 | </body> |
262 | </html> |