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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="X-UA-Compatible" content="IE=Edge" /> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>Class-based event handlers — zope.event 4.2.0 documentation</title> <link rel="stylesheet" href="_static/classic.css" type="text/css" /> <link rel="stylesheet" href="_static/pygments.css" type="text/css" /> <script type="text/javascript" id="documentation_options" data-url_root="./" src="_static/documentation_options.js"></script> <script type="text/javascript" src="_static/jquery.js"></script> <script type="text/javascript" src="_static/underscore.js"></script> <script type="text/javascript" src="_static/doctools.js"></script> <link rel="index" title="Index" href="genindex.html" /> <link rel="search" title="Search" href="search.html" /> <link rel="next" title="Hacking on zope.event" href="hacking.html" /> <link rel="prev" title="zope.event API Reference" href="api.html" /> </head><body> <div class="related" role="navigation" aria-label="related navigation"> <h3>Navigation</h3> <ul> <li class="right" style="margin-right: 10px"> <a href="genindex.html" title="General Index" accesskey="I">index</a></li> <li class="right" > <a href="hacking.html" title="Hacking on zope.event" accesskey="N">next</a> |</li> <li class="right" > <a href="api.html" title="zope.event API Reference" accesskey="P">previous</a> |</li> <li class="nav-item nav-item-0"><a href="index.html">zope.event 4.2.0 documentation</a> »</li> </ul> </div> <div class="document"> <div class="documentwrapper"> <div class="bodywrapper"> <div class="body" role="main"> <div class="section" id="class-based-event-handlers"> <h1>Class-based event handlers<a class="headerlink" href="#class-based-event-handlers" title="Permalink to this headline">ΒΆ</a></h1> <p>A light-weight event-handler framework based on event classes is provided by the <code class="docutils literal notranslate"><span class="pre">zope.event.classhandler</span></code> module.</p> <p>Handlers are registered for event classes:</p> <div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="gp">>>> </span><span class="kn">import</span> <span class="nn">zope.event.classhandler</span> </pre></div> </div> <div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="gp">>>> </span><span class="k">class</span> <span class="nc">MyEvent</span><span class="p">(</span><span class="nb">object</span><span class="p">):</span> <span class="gp">... </span> <span class="k">def</span> <span class="nf">__repr__</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span> <span class="gp">... </span> <span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="vm">__class__</span><span class="o">.</span><span class="vm">__name__</span> </pre></div> </div> <div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="gp">>>> </span><span class="k">def</span> <span class="nf">handler1</span><span class="p">(</span><span class="n">event</span><span class="p">):</span> <span class="gp">... </span> <span class="nb">print</span><span class="p">(</span><span class="s2">"handler1 </span><span class="si">%r</span><span class="s2">"</span> <span class="o">%</span> <span class="n">event</span><span class="p">)</span> </pre></div> </div> <div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="gp">>>> </span><span class="n">zope</span><span class="o">.</span><span class="n">event</span><span class="o">.</span><span class="n">classhandler</span><span class="o">.</span><span class="n">handler</span><span class="p">(</span><span class="n">MyEvent</span><span class="p">,</span> <span class="n">handler1</span><span class="p">)</span> </pre></div> </div> <p>Descriptor syntax:</p> <div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="gp">>>> </span><span class="nd">@zope</span><span class="o">.</span><span class="n">event</span><span class="o">.</span><span class="n">classhandler</span><span class="o">.</span><span class="n">handler</span><span class="p">(</span><span class="n">MyEvent</span><span class="p">)</span> <span class="gp">... </span><span class="k">def</span> <span class="nf">handler2</span><span class="p">(</span><span class="n">event</span><span class="p">):</span> <span class="gp">... </span> <span class="nb">print</span><span class="p">(</span><span class="s2">"handler2 </span><span class="si">%r</span><span class="s2">"</span> <span class="o">%</span> <span class="n">event</span><span class="p">)</span> </pre></div> </div> <div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="gp">>>> </span><span class="k">class</span> <span class="nc">MySubEvent</span><span class="p">(</span><span class="n">MyEvent</span><span class="p">):</span> <span class="gp">... </span> <span class="k">pass</span> </pre></div> </div> <div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="gp">>>> </span><span class="nd">@zope</span><span class="o">.</span><span class="n">event</span><span class="o">.</span><span class="n">classhandler</span><span class="o">.</span><span class="n">handler</span><span class="p">(</span><span class="n">MySubEvent</span><span class="p">)</span> <span class="gp">... </span><span class="k">def</span> <span class="nf">handler3</span><span class="p">(</span><span class="n">event</span><span class="p">):</span> <span class="gp">... </span> <span class="nb">print</span><span class="p">(</span><span class="s2">"handler3 </span><span class="si">%r</span><span class="s2">"</span> <span class="o">%</span> <span class="n">event</span><span class="p">)</span> </pre></div> </div> <p>Subscribers are called in class method-resolution order, so only new-style event classes are supported, and then by order of registry.</p> <div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="gp">>>> </span><span class="kn">import</span> <span class="nn">zope.event</span> <span class="gp">>>> </span><span class="n">zope</span><span class="o">.</span><span class="n">event</span><span class="o">.</span><span class="n">notify</span><span class="p">(</span><span class="n">MySubEvent</span><span class="p">())</span> <span class="go">handler3 MySubEvent</span> <span class="go">handler1 MySubEvent</span> <span class="go">handler2 MySubEvent</span> </pre></div> </div> </div> </div> </div> </div> <div class="sphinxsidebar" role="navigation" aria-label="main navigation"> <div class="sphinxsidebarwrapper"> <h4>Previous topic</h4> <p class="topless"><a href="api.html" title="previous chapter"><code 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