wxPython/docs/wxPythonExamples.html

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   7 <title>Example Programs Using wxPython</title>
   8 <meta name="author" content="Patrick K. O'Brien" />
   9 <meta name="organization" content="Orbtech" />
  10 <meta name="date" content="2003-07-02" />
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  14 <div class="document" id="example-programs-using-wxpython">
  15 <h1 class="title">Example Programs Using wxPython</h1>
  16 <h2 class="subtitle" id="a-survival-guide-for-the-post-wx-prefixed-world">A survival guide for the post-wx-prefixed world.</h2>
  17 <table class="docinfo" frame="void" rules="none">
  18 <col class="docinfo-name" />
  19 <col class="docinfo-content" />
  20 <tbody valign="top">
  21 <tr><th class="docinfo-name">Author:</th>
  22 <td>Patrick K. O'Brien</td></tr>
  23 <tr><th class="docinfo-name">Contact:</th>
  24 <td><a class="first last reference" href="mailto:pobrien&#64;orbtech.com">pobrien&#64;orbtech.com</a></td></tr>
  25 <tr><th class="docinfo-name">Organization:</th>
  26 <td><a class="first last reference" href="http://www.orbtech.com/">Orbtech</a></td></tr>
  27 <tr><th class="docinfo-name">Date:</th>
  28 <td>2003-07-02</td></tr>
  29 <tr><th class="docinfo-name">Revision:</th>
  30 <td>1.2</td></tr>
  31 </tbody>
  32 </table>
  33 <div class="contents topic" id="contents">
  34 <p class="topic-title"><a name="contents">Contents</a></p>
  35 <ul class="simple">
  36 <li><a class="reference" href="#introduction" id="id1" name="id1">Introduction</a></li>
  37 <li><a class="reference" href="#background-with-tongue-firmly-in-cheek" id="id2" name="id2">Background (with tongue firmly in cheek)</a></li>
  38 <li><a class="reference" href="#basic-program-example" id="id3" name="id3">Basic Program Example</a></li>
  39 <li><a class="reference" href="#hello-wxpython-example" id="id4" name="id4">Hello wxPython Example</a></li>
  40 </ul>
  41 </div>
  42 <div class="section" id="introduction">
  43 <h1><a class="toc-backref" href="#id1" name="introduction">Introduction</a></h1>
  44 <p>This document illustrates example programs using wxPython.  All the
  45 examples make use of the new wx package syntax introduced in wxPython
  46 2.4.1, which is a bit different than older examples you might come
  47 across.</p>
  48 </div>
  49 <div class="section" id="background-with-tongue-firmly-in-cheek">
  50 <h1><a class="toc-backref" href="#id2" name="background-with-tongue-firmly-in-cheek">Background (with tongue firmly in cheek)</a></h1>
  51 <p>If something hits you on the head, don't run around screaming that the
  52 sky is falling.  Instead, take a close look and see if it wasn't a
  53 &quot;wx&quot; prefix that hit you.  Apparently, they're dropping off wxPython
  54 class names like flies dropping dead in the scorching heat of a
  55 summer's day.</p>
  56 <p>Yes, the world is changing, and even our little wxPython world must
  57 change with it.  Then again, I'm not fond of pesky summertime flies,
  58 and I'm not too upset that the &quot;wx&quot; prefixes are going to bite the
  59 dust.  I think it's for the best.  But, being the kind, considerate
  60 person that I am, I decided to write this guide to make the wx
  61 namespace transition easier for everyone, even Chicken Little.</p>
  62 <div class="note">
  63 <p class="admonition-title">Note</p>
  64 <p>Say what?</p>
  65 <p>If you have no idea what I mean by the &quot;wx namespace transition,&quot;
  66 consider yourself lucky.  You can simply use these examples to
  67 learn wxPython in its current state (beginning with wxPython
  68 version 2.4.1).  All you need to know is that previous wxPython
  69 code used a slightly different syntax that some folks (including
  70 me) considered ugly.  So we changed it.  And that's when the sky
  71 starting falling...</p>
  72 <p>If you want more of the technical details, read the <a class="reference" href="wxPackage.html">wx package
  73 documentation</a>.</p>
  74 </div>
  75 <p>Rather than simply <strong>tell</strong> you that everything will be okay, I
  76 decided to <strong>show</strong> you that everything will be okay.  To do that,
  77 I've created a bunch of example programs using the new wx package.  I
  78 hope you like them.</p>
  79 </div>
  80 <div class="section" id="basic-program-example">
  81 <h1><a class="toc-backref" href="#id3" name="basic-program-example">Basic Program Example</a></h1>
  82 <p>It doesn't get much simpler than this.  Every wxPython program needs
  83 an application and a frame.  To encourage good coding habits, I've
  84 split them into separate modules.  They don't do much, but they're a
  85 good starting point.</p>
  86 <p>I include a simple App class in the frame module because the PyWrap
  87 &quot;wrapper&quot; utility (<tt class="literal"><span class="pre">pywrap</span></tt>) only works with modules that contain an
  88 application class.  So including a simple one in each of your frame
  89 modules allows you to use the PyWrap runtime wrapper and debug your
  90 frames independent of your full application.</p>
  91 <p>Here is the module (<tt class="literal"><span class="pre">frame.py</span></tt>) that defines the frame class:</p>
  92 <pre class="literal-block">
  93 #!/usr/bin/env python
  94
  95 &quot;&quot;&quot;Basic frame class, with App for testing.&quot;&quot;&quot;
  96
  97 __author__ = &quot;Patrick K. O'Brien &lt;pobrien&#64;orbtech.com&gt;&quot;
  98 __cvsid__ = &quot;$Id$&quot;
  99 __revision__ = &quot;$Revision$&quot;[11:-2]
 100
 101 import wx
 102
 103 class Frame(wx.Frame):
 104     &quot;&quot;&quot;Frame class.&quot;&quot;&quot;
 105
 106     def __init__(self, parent=None, id=-1, title='Title',
 107                  pos=wx.DefaultPosition, size=(400, 200)):
 108         &quot;&quot;&quot;Create a Frame instance.&quot;&quot;&quot;
 109         wx.Frame.__init__(self, parent, id, title, pos, size)
 110
 111 class App(wx.App):
 112     &quot;&quot;&quot;Application class.&quot;&quot;&quot;
 113
 114     def OnInit(self):
 115         self.frame = Frame()
 116         self.frame.Show()
 117         self.SetTopWindow(self.frame)
 118         return True
 119
 120 def main():
 121     app = App()
 122     app.MainLoop()
 123
 124 if __name__ == '__main__':
 125     main()
 126
 127 </pre>
 128 <p>And here is the module (<tt class="literal"><span class="pre">app.py</span></tt>) that defines the application class
 129 and imports the frame from <tt class="literal"><span class="pre">frame.py</span></tt>:</p>
 130 <pre class="literal-block">
 131 #!/usr/bin/env python
 132
 133 &quot;&quot;&quot;Basic application class.&quot;&quot;&quot;
 134
 135 __author__ = &quot;Patrick K. O'Brien &lt;pobrien&#64;orbtech.com&gt;&quot;
 136 __cvsid__ = &quot;$Id$&quot;
 137 __revision__ = &quot;$Revision$&quot;[11:-2]
 138
 139 import wx
 140
 141 from frame import Frame
 142
 143 class App(wx.App):
 144     &quot;&quot;&quot;Application class.&quot;&quot;&quot;
 145
 146     def OnInit(self):
 147         self.frame = Frame()
 148         self.frame.Show()
 149         self.SetTopWindow(self.frame)
 150         return True
 151
 152 def main():
 153     app = App()
 154     app.MainLoop()
 155
 156 if __name__ == '__main__':
 157     main()
 158
 159 </pre>
 160 </div>
 161 <div class="section" id="hello-wxpython-example">
 162 <h1><a class="toc-backref" href="#id4" name="hello-wxpython-example">Hello wxPython Example</a></h1>
 163 <p>This program displays an image file (<tt class="literal"><span class="pre">wxPython.jpg</span></tt>) inside a frame
 164 sized to match the graphic.</p>
 165 <div class="figure">
 166 <p><img alt="screenshots/hello-win98.png" scale="100" src="screenshots/hello-win98.png" /></p>
 167 <p class="caption">Running <tt class="literal"><span class="pre">hello.py</span></tt> on Windows.</p>
 168 </div>
 169 <div class="figure">
 170 <p><img alt="screenshots/hello-linux.png" scale="100" src="screenshots/hello-linux.png" /></p>
 171 <p class="caption">Running <tt class="literal"><span class="pre">hello.py</span></tt> on Linux.</p>
 172 </div>
 173 <div class="figure">
 174 <p><img alt="screenshots/hello-mac.png" scale="100" src="screenshots/hello-mac.png" /></p>
 175 <p class="caption">Running <tt class="literal"><span class="pre">hello.py</span></tt> on Mac OS X.</p>
 176 </div>
 177 <p>Here is the source code for <tt class="literal"><span class="pre">hello.py</span></tt>:</p>
 178 <pre class="literal-block">
 179 #!/usr/bin/env python
 180
 181 &quot;&quot;&quot;Hello, wxPython! program.&quot;&quot;&quot;
 182
 183 __author__ = &quot;Patrick K. O'Brien &lt;pobrien&#64;orbtech.com&gt;&quot;
 184 __cvsid__ = &quot;$Id$&quot;
 185 __revision__ = &quot;$Revision$&quot;[11:-2]
 186
 187 import wx
 188
 189 class Frame(wx.Frame):
 190     &quot;&quot;&quot;Frame class that displays an image.&quot;&quot;&quot;
 191
 192     def __init__(self, image, parent=None, id=-1,
 193                  pos=wx.DefaultPosition, title='Hello, wxPython!'):
 194         &quot;&quot;&quot;Create a Frame instance and display image.&quot;&quot;&quot;
 195         temp = image.ConvertToBitmap()
 196         size = temp.GetWidth(), temp.GetHeight()
 197         wx.Frame.__init__(self, parent, id, title, pos, size)
 198         self.bmp = wx.StaticBitmap(parent=self, id=-1, bitmap=temp)
 199
 200 class App(wx.App):
 201     &quot;&quot;&quot;Application class.&quot;&quot;&quot;
 202
 203     def OnInit(self):
 204         wx.InitAllImageHandlers()
 205         image = wx.Image('wxPython.jpg', wx.BITMAP_TYPE_JPEG)
 206         self.frame = Frame(image)
 207         self.frame.Show()
 208         self.SetTopWindow(self.frame)
 209         return True
 210
 211 def main():
 212     app = App()
 213     app.MainLoop()
 214
 215 if __name__ == '__main__':
 216     main()
 217
 218 </pre>
 219 </div>
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