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<h1>Source code for ezpygame.event</h1><div class="highlight"><pre>
<span></span><span class="kn">import</span> <span class="nn">collections</span>
<span class="kn">import</span> <span class="nn">functools</span>


<div class="viewcode-block" id="handler"><a class="viewcode-back" href="../../index.html#ezpygame.event.handler">[docs]</a><span class="k">def</span> <span class="nf">handler</span><span class="p">(</span><span class="n">event_type</span><span class="p">):</span>
<span class="sd">&quot;&quot;&quot;Decorator for registering scene&#39;s methods as event handlers.</span>

<span class="sd"> Tags the scene&#39;s method as an event handler, so when it&#39;s ran,</span>
<span class="sd"> the application knows how to register and unregister the method</span>
<span class="sd"> automatically for its :class:`Manager`.</span>

<span class="sd"> For example:</span>

<span class="sd"> .. code-block:: python</span>

<span class="sd"> class Menu(ezpygame.Scene):</span>

<span class="sd"> @ezpygame.event.handler(pygame.MOUSEBUTTONUP)</span>
<span class="sd"> def select_item(self, event):</span>
<span class="sd"> if event.key != 1:</span>
<span class="sd"> return</span>
<span class="sd"> item = self.items[index_from_coords(event.pos)]</span>
<span class="sd"> game = Game(item=item)</span>
<span class="sd"> self.application.change_scene(game)</span>

<span class="sd"> :param pygame.event.EventType event_type: event type to listen</span>
<span class="sd"> &quot;&quot;&quot;</span>
<span class="k">def</span> <span class="nf">decorator</span><span class="p">(</span><span class="n">handler</span><span class="p">):</span>
<span class="n">handler</span><span class="o">.</span><span class="n">_handle_event</span> <span class="o">=</span> <span class="n">event_type</span>
<span class="k">return</span> <span class="n">handler</span>
<span class="k">return</span> <span class="n">decorator</span></div>


<div class="viewcode-block" id="Manager"><a class="viewcode-back" href="../../index.html#ezpygame.event.Manager">[docs]</a><span class="k">class</span> <span class="nc">Manager</span><span class="p">(</span><span class="n">collections</span><span class="o">.</span><span class="n">defaultdict</span><span class="p">):</span>
<span class="sd">&quot;&quot;&quot;Class for managing event handlers.</span>

<span class="sd"> Allows handler callbacks to be registered and unregistered with</span>
<span class="sd"> the :meth:`register` and :meth:`unregister` methods:</span>

<span class="sd"> .. code-block:: python</span>

<span class="sd"> &gt;&gt;&gt; manager = Manager()</span>
<span class="sd"> &gt;&gt;&gt; manager.register(pygame.KEYDOWN, my_callback1, my_callback2)</span>
<span class="sd"> &gt;&gt;&gt; manager.register(pygame.KEYDOWN, my_callback3)</span>
<span class="sd"> &gt;&gt;&gt; manager.unregister(pygame.KEYDOWN, my_callback1)</span>
<span class="sd"> &gt;&gt;&gt; print(manager[pygame.KEYDOWN])</span>
<span class="sd"> [&lt;function &#39;my_callback2&#39;&gt;, &lt;function &#39;my_callback3&#39;&gt;]</span>
<span class="sd"> &gt;&gt;&gt; manager.clear(pygame.KEYDOWN)</span>
<span class="sd"> &gt;&gt;&gt; print(manager[pygame.KEYDOWN])</span>
<span class="sd"> []</span>
<span class="sd"> &quot;&quot;&quot;</span>

<div class="viewcode-block" id="Manager.__init__"><a class="viewcode-back" href="../../index.html#ezpygame.event.Manager.__init__">[docs]</a> <span class="k">def</span> <span class="nf">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="sd">&quot;&quot;&quot;Initialize the :attr:`default_factory` to ``list``.&quot;&quot;&quot;</span>
<span class="nb">super</span><span class="p">()</span><span class="o">.</span><span class="fm">__init__</span><span class="p">(</span><span class="nb">list</span><span class="p">)</span></div>

<div class="viewcode-block" id="Manager.register"><a class="viewcode-back" href="../../index.html#ezpygame.event.Manager.register">[docs]</a> <span class="k">def</span> <span class="nf">register</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">event_type</span><span class="p">,</span> <span class="o">*</span><span class="n">handlers</span><span class="p">):</span>
<span class="sd">&quot;&quot;&quot;Register handler callback(s) to an event.</span>

<span class="sd"> :param pygame.event.EventType event_type: event type to listen</span>
<span class="sd"> :param tuple[callable] \*handlers: handler callbacks to register</span>
<span class="sd"> &quot;&quot;&quot;</span>
<span class="k">for</span> <span class="n">handler</span> <span class="ow">in</span> <span class="n">handlers</span><span class="p">:</span>
<span class="k">if</span> <span class="n">handler</span> <span class="ow">in</span> <span class="bp">self</span><span class="p">[</span><span class="n">event_type</span><span class="p">]:</span>
<span class="k">raise</span> <span class="ne">ValueError</span><span class="p">(</span><span class="s1">&#39;</span><span class="si">{}</span><span class="s1"> already registered&#39;</span><span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="n">handler</span><span class="p">))</span>
<span class="bp">self</span><span class="p">[</span><span class="n">event_type</span><span class="p">]</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="n">handler</span><span class="p">)</span></div>

<div class="viewcode-block" id="Manager.unregister"><a class="viewcode-back" href="../../index.html#ezpygame.event.Manager.unregister">[docs]</a> <span class="k">def</span> <span class="nf">unregister</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">event_type</span><span class="p">,</span> <span class="o">*</span><span class="n">handlers</span><span class="p">):</span>
<span class="sd">&quot;&quot;&quot;Unregister handler callback(s) from an event.</span>

<span class="sd"> :param pygame.event.EventType event_type: event type to listen</span>
<span class="sd"> :param tuple[callable] \*handlers: handler callbacks to register</span>
<span class="sd"> &quot;&quot;&quot;</span>
<span class="k">for</span> <span class="n">handler</span> <span class="ow">in</span> <span class="n">handlers</span><span class="p">:</span>
<span class="k">if</span> <span class="n">handler</span> <span class="ow">not</span> <span class="ow">in</span> <span class="bp">self</span><span class="p">[</span><span class="n">event_type</span><span class="p">]:</span>
<span class="k">raise</span> <span class="ne">ValueError</span><span class="p">(</span><span class="s1">&#39;</span><span class="si">{}</span><span class="s1"> not registerd&#39;</span><span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="n">handler</span><span class="p">))</span>
<span class="bp">self</span><span class="p">[</span><span class="n">event_type</span><span class="p">]</span><span class="o">.</span><span class="n">remove</span><span class="p">(</span><span class="n">handler</span><span class="p">)</span></div>

<div class="viewcode-block" id="Manager.clear"><a class="viewcode-back" href="../../index.html#ezpygame.event.Manager.clear">[docs]</a> <span class="k">def</span> <span class="nf">clear</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="o">*</span><span class="n">event_types</span><span class="p">):</span>
<span class="sd">&quot;&quot;&quot;Unregister all handlers (from event type(s)).</span>

<span class="sd"> If event types are provided as arguments, only listeners of</span>
<span class="sd"> those types will be cleared. Else all listeners in the manager</span>
<span class="sd"> will be cleared.</span>

<span class="sd"> :param tuple[pygame.event.EventType] \*event_types: clear types</span>
<span class="sd"> &quot;&quot;&quot;</span>
<span class="k">if</span> <span class="ow">not</span> <span class="n">event_types</span><span class="p">:</span>
<span class="nb">super</span><span class="p">()</span><span class="o">.</span><span class="n">clear</span><span class="p">()</span>
<span class="k">else</span><span class="p">:</span>
<span class="k">for</span> <span class="n">event_type</span> <span class="ow">in</span> <span class="n">event_types</span><span class="p">:</span>
<span class="bp">self</span><span class="p">[</span><span class="n">event_type</span><span class="p">]</span><span class="o">.</span><span class="n">clear</span><span class="p">()</span></div>

<div class="viewcode-block" id="Manager.fire"><a class="viewcode-back" href="../../index.html#ezpygame.event.Manager.fire">[docs]</a> <span class="k">def</span> <span class="nf">fire</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">event</span><span class="p">):</span>
<span class="sd">&quot;&quot;&quot;Fire an event, invoking all the handlers.</span>

<span class="sd"> :param pygame.event.Event: event to fire</span>
<span class="sd"> &quot;&quot;&quot;</span>
<span class="k">for</span> <span class="n">handler</span> <span class="ow">in</span> <span class="bp">self</span><span class="p">[</span><span class="n">event</span><span class="o">.</span><span class="n">type</span><span class="p">]:</span>
<span class="n">handler</span><span class="p">(</span><span class="n">event</span><span class="p">)</span></div></div>
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