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<section id="module-evennia.contrib.base_systems.components.holder">
<span id="evennia-contrib-base-systems-components-holder"></span><h1>evennia.contrib.base_systems.components.holder<a class="headerlink" href="#module-evennia.contrib.base_systems.components.holder" title="Permalink to this headline"></a></h1>
<p>Components - ChrisLR 2022</p>
<p>This file contains the classes that allow a typeclass to use components.</p>
<dl class="py class">
<dt id="evennia.contrib.base_systems.components.holder.ComponentProperty">
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<em class="property">class </em><code class="sig-prename descclassname">evennia.contrib.base_systems.components.holder.</code><code class="sig-name descname">ComponentProperty</code><span class="sig-paren">(</span><em class="sig-param"><span class="n">name</span></em>, <em class="sig-param"><span class="o">**</span><span class="n">kwargs</span></em><span class="sig-paren">)</span><a class="reference internal" href="../_modules/evennia/contrib/base_systems/components/holder.html#ComponentProperty"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#evennia.contrib.base_systems.components.holder.ComponentProperty" title="Permalink to this definition"></a></dt>
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<dd><p>Bases: <code class="xref py py-class docutils literal notranslate"><span class="pre">object</span></code></p>
<p>This allows you to register a component on a typeclass.
Components registered with this property are automatically added
to any instance of this typeclass.</p>
<p>Defaults can be overridden for this typeclass by passing kwargs</p>
<dl class="py method">
<dt id="evennia.contrib.base_systems.components.holder.ComponentProperty.__init__">
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<code class="sig-name descname">__init__</code><span class="sig-paren">(</span><em class="sig-param"><span class="n">name</span></em>, <em class="sig-param"><span class="o">**</span><span class="n">kwargs</span></em><span class="sig-paren">)</span><a class="reference internal" href="../_modules/evennia/contrib/base_systems/components/holder.html#ComponentProperty.__init__"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#evennia.contrib.base_systems.components.holder.ComponentProperty.__init__" title="Permalink to this definition"></a></dt>
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<dd><p>Initializes the descriptor</p>
<dl class="field-list simple">
<dt class="field-odd">Parameters</dt>
<dd class="field-odd"><ul class="simple">
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<li><p><strong>name</strong> (<em>str</em>) – The name of the component</p></li>
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<li><p><strong>**kwargs</strong> (<em>any</em>) – Key=Values overriding default values of the component</p></li>
</ul>
</dd>
</dl>
</dd></dl>
</dd></dl>
<dl class="py class">
<dt id="evennia.contrib.base_systems.components.holder.ComponentHandler">
<em class="property">class </em><code class="sig-prename descclassname">evennia.contrib.base_systems.components.holder.</code><code class="sig-name descname">ComponentHandler</code><span class="sig-paren">(</span><em class="sig-param"><span class="n">host</span></em><span class="sig-paren">)</span><a class="reference internal" href="../_modules/evennia/contrib/base_systems/components/holder.html#ComponentHandler"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#evennia.contrib.base_systems.components.holder.ComponentHandler" title="Permalink to this definition"></a></dt>
<dd><p>Bases: <code class="xref py py-class docutils literal notranslate"><span class="pre">object</span></code></p>
<p>This is the handler that will be added to any typeclass that inherits from ComponentHolder.
It lets you add or remove components and will load components as needed.
It stores the list of registered components on the host .db with component_names as key.</p>
<dl class="py method">
<dt id="evennia.contrib.base_systems.components.holder.ComponentHandler.__init__">
<code class="sig-name descname">__init__</code><span class="sig-paren">(</span><em class="sig-param"><span class="n">host</span></em><span class="sig-paren">)</span><a class="reference internal" href="../_modules/evennia/contrib/base_systems/components/holder.html#ComponentHandler.__init__"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#evennia.contrib.base_systems.components.holder.ComponentHandler.__init__" title="Permalink to this definition"></a></dt>
<dd><p>Initialize self. See help(type(self)) for accurate signature.</p>
</dd></dl>
<dl class="py method">
<dt id="evennia.contrib.base_systems.components.holder.ComponentHandler.add">
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<code class="sig-name descname">add</code><span class="sig-paren">(</span><em class="sig-param"><span class="n">component</span><span class="p">:</span> <span class="n"><a class="reference internal" href="evennia.contrib.base_systems.components.component.html#evennia.contrib.base_systems.components.component.Component" title="evennia.contrib.base_systems.components.component.Component">evennia.contrib.base_systems.components.component.Component</a></span></em><span class="sig-paren">)</span><a class="reference internal" href="../_modules/evennia/contrib/base_systems/components/holder.html#ComponentHandler.add"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#evennia.contrib.base_systems.components.holder.ComponentHandler.add" title="Permalink to this definition"></a></dt>
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<dd><p>Method to add a Component to a host.
It caches the loaded component and appends its name to the host’s component name list.
It will also call the component’s ‘at_added’ method, passing its host.</p>
<dl class="field-list simple">
<dt class="field-odd">Parameters</dt>
<dd class="field-odd"><p><strong>component</strong> (<em>object</em>) – The ‘loaded’ component instance to add.</p>
</dd>
</dl>
</dd></dl>
<dl class="py method">
<dt id="evennia.contrib.base_systems.components.holder.ComponentHandler.add_default">
<code class="sig-name descname">add_default</code><span class="sig-paren">(</span><em class="sig-param"><span class="n">name</span></em><span class="sig-paren">)</span><a class="reference internal" href="../_modules/evennia/contrib/base_systems/components/holder.html#ComponentHandler.add_default"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#evennia.contrib.base_systems.components.holder.ComponentHandler.add_default" title="Permalink to this definition"></a></dt>
<dd><p>Method to add a Component initialized to default values on a host.
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It will retrieve the proper component and instantiate it with ‘default_create’.
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It will cache this new component and add it to its list.
It will also call the component’s ‘at_added’ method, passing its host.</p>
<dl class="field-list simple">
<dt class="field-odd">Parameters</dt>
<dd class="field-odd"><p><strong>name</strong> (<em>str</em>) – The name of the component class to add.</p>
</dd>
</dl>
</dd></dl>
<dl class="py method">
<dt id="evennia.contrib.base_systems.components.holder.ComponentHandler.remove">
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<code class="sig-name descname">remove</code><span class="sig-paren">(</span><em class="sig-param"><span class="n">component</span><span class="p">:</span> <span class="n"><a class="reference internal" href="evennia.contrib.base_systems.components.component.html#evennia.contrib.base_systems.components.component.Component" title="evennia.contrib.base_systems.components.component.Component">evennia.contrib.base_systems.components.component.Component</a></span></em><span class="sig-paren">)</span><a class="reference internal" href="../_modules/evennia/contrib/base_systems/components/holder.html#ComponentHandler.remove"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#evennia.contrib.base_systems.components.holder.ComponentHandler.remove" title="Permalink to this definition"></a></dt>
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<dd><p>Method to remove a component instance from a host.
It removes the component from the cache and listing.
It will call the component’s ‘at_removed’ method.</p>
<dl class="field-list simple">
<dt class="field-odd">Parameters</dt>
<dd class="field-odd"><p><strong>component</strong> (<em>object</em>) – The component instance to remove.</p>
</dd>
</dl>
</dd></dl>
<dl class="py method">
<dt id="evennia.contrib.base_systems.components.holder.ComponentHandler.remove_by_name">
<code class="sig-name descname">remove_by_name</code><span class="sig-paren">(</span><em class="sig-param"><span class="n">name</span></em><span class="sig-paren">)</span><a class="reference internal" href="../_modules/evennia/contrib/base_systems/components/holder.html#ComponentHandler.remove_by_name"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#evennia.contrib.base_systems.components.holder.ComponentHandler.remove_by_name" title="Permalink to this definition"></a></dt>
<dd><p>Method to remove a component instance from a host.
It removes the component from the cache and listing.
It will call the component’s ‘at_removed’ method.</p>
<dl class="field-list simple">
<dt class="field-odd">Parameters</dt>
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<dd class="field-odd"><p><strong>name</strong> (<em>str</em>) – The name of the component to remove or its slot.</p>
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</dd>
</dl>
</dd></dl>
<dl class="py method">
<dt id="evennia.contrib.base_systems.components.holder.ComponentHandler.get">
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<code class="sig-name descname">get</code><span class="sig-paren">(</span><em class="sig-param"><span class="n">name</span><span class="p">:</span> <span class="n">str</span></em><span class="sig-paren">)</span> &#x2192; evennia.contrib.base_systems.components.component.Component | None<a class="reference internal" href="../_modules/evennia/contrib/base_systems/components/holder.html#ComponentHandler.get"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#evennia.contrib.base_systems.components.holder.ComponentHandler.get" title="Permalink to this definition"></a></dt>
<dd></dd></dl>
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<dl class="py method">
<dt id="evennia.contrib.base_systems.components.holder.ComponentHandler.has">
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<code class="sig-name descname">has</code><span class="sig-paren">(</span><em class="sig-param"><span class="n">name</span><span class="p">:</span> <span class="n">str</span></em><span class="sig-paren">)</span> &#x2192; bool<a class="reference internal" href="../_modules/evennia/contrib/base_systems/components/holder.html#ComponentHandler.has"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#evennia.contrib.base_systems.components.holder.ComponentHandler.has" title="Permalink to this definition"></a></dt>
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<dd><p>Method to check if a component is registered and ready.</p>
<dl class="field-list simple">
<dt class="field-odd">Parameters</dt>
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<dd class="field-odd"><p><strong>name</strong> (<em>str</em>) – The name of the component or the slot.</p>
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</dd>
</dl>
</dd></dl>
<dl class="py method">
<dt id="evennia.contrib.base_systems.components.holder.ComponentHandler.initialize">
<code class="sig-name descname">initialize</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="reference internal" href="../_modules/evennia/contrib/base_systems/components/holder.html#ComponentHandler.initialize"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#evennia.contrib.base_systems.components.holder.ComponentHandler.initialize" title="Permalink to this definition"></a></dt>
<dd><p>Method that loads and caches each component currently registered on the host.
It retrieves the names from the registered listing and calls ‘load’ on each
prototype class that can be found from this listing.</p>
</dd></dl>
<dl class="py method">
<dt id="evennia.contrib.base_systems.components.holder.ComponentHandler.db_names">
<em class="property">property </em><code class="sig-name descname">db_names</code><a class="headerlink" href="#evennia.contrib.base_systems.components.holder.ComponentHandler.db_names" title="Permalink to this definition"></a></dt>
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<dd><p>Property shortcut to retrieve the registered component keys</p>
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<dl class="field-list simple">
<dt class="field-odd">Returns</dt>
<dd class="field-odd"><p><em>component_names (iterable)</em> – The name of each component that is registered</p>
</dd>
</dl>
</dd></dl>
</dd></dl>
<dl class="py class">
<dt id="evennia.contrib.base_systems.components.holder.ComponentHolderMixin">
<em class="property">class </em><code class="sig-prename descclassname">evennia.contrib.base_systems.components.holder.</code><code class="sig-name descname">ComponentHolderMixin</code><a class="reference internal" href="../_modules/evennia/contrib/base_systems/components/holder.html#ComponentHolderMixin"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#evennia.contrib.base_systems.components.holder.ComponentHolderMixin" title="Permalink to this definition"></a></dt>
<dd><p>Bases: <code class="xref py py-class docutils literal notranslate"><span class="pre">object</span></code></p>
<p>Mixin to add component support to a typeclass</p>
<p>Components are set on objects using the component.name as an object attribute.
All registered components are initialized on the typeclass.
They will be of None value if not present in the class components or runtime components.</p>
<dl class="py method">
<dt id="evennia.contrib.base_systems.components.holder.ComponentHolderMixin.at_init">
<code class="sig-name descname">at_init</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="reference internal" href="../_modules/evennia/contrib/base_systems/components/holder.html#ComponentHolderMixin.at_init"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#evennia.contrib.base_systems.components.holder.ComponentHolderMixin.at_init" title="Permalink to this definition"></a></dt>
<dd><p>Method that initializes the ComponentHandler.</p>
</dd></dl>
<dl class="py method">
<dt id="evennia.contrib.base_systems.components.holder.ComponentHolderMixin.at_post_puppet">
<code class="sig-name descname">at_post_puppet</code><span class="sig-paren">(</span><em class="sig-param"><span class="o">*</span><span class="n">args</span></em>, <em class="sig-param"><span class="o">**</span><span class="n">kwargs</span></em><span class="sig-paren">)</span><a class="reference internal" href="../_modules/evennia/contrib/base_systems/components/holder.html#ComponentHolderMixin.at_post_puppet"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#evennia.contrib.base_systems.components.holder.ComponentHolderMixin.at_post_puppet" title="Permalink to this definition"></a></dt>
<dd></dd></dl>
<dl class="py method">
<dt id="evennia.contrib.base_systems.components.holder.ComponentHolderMixin.at_post_unpuppet">
<code class="sig-name descname">at_post_unpuppet</code><span class="sig-paren">(</span><em class="sig-param"><span class="o">*</span><span class="n">args</span></em>, <em class="sig-param"><span class="o">**</span><span class="n">kwargs</span></em><span class="sig-paren">)</span><a class="reference internal" href="../_modules/evennia/contrib/base_systems/components/holder.html#ComponentHolderMixin.at_post_unpuppet"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#evennia.contrib.base_systems.components.holder.ComponentHolderMixin.at_post_unpuppet" title="Permalink to this definition"></a></dt>
<dd></dd></dl>
<dl class="py method">
<dt id="evennia.contrib.base_systems.components.holder.ComponentHolderMixin.basetype_setup">
<code class="sig-name descname">basetype_setup</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="reference internal" href="../_modules/evennia/contrib/base_systems/components/holder.html#ComponentHolderMixin.basetype_setup"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#evennia.contrib.base_systems.components.holder.ComponentHolderMixin.basetype_setup" title="Permalink to this definition"></a></dt>
<dd><p>Method that initializes the ComponentHandler, creates and registers all
components that were set on the typeclass using ComponentProperty.</p>
</dd></dl>
<dl class="py method">
<dt id="evennia.contrib.base_systems.components.holder.ComponentHolderMixin.components">
<em class="property">property </em><code class="sig-name descname">components</code><a class="headerlink" href="#evennia.contrib.base_systems.components.holder.ComponentHolderMixin.components" title="Permalink to this definition"></a></dt>
<dd><p>Property getter to retrieve the component_handler.
:returns: <em>ComponentHandler</em> – This Host’s ComponentHandler</p>
</dd></dl>
<dl class="py method">
<dt id="evennia.contrib.base_systems.components.holder.ComponentHolderMixin.cmp">
<em class="property">property </em><code class="sig-name descname">cmp</code><a class="headerlink" href="#evennia.contrib.base_systems.components.holder.ComponentHolderMixin.cmp" title="Permalink to this definition"></a></dt>
<dd><p>Shortcut Property getter to retrieve the component_handler.
:returns: <em>ComponentHandler</em> – This Host’s ComponentHandler</p>
</dd></dl>
<dl class="py method">
<dt id="evennia.contrib.base_systems.components.holder.ComponentHolderMixin.signals">
<em class="property">property </em><code class="sig-name descname">signals</code><a class="headerlink" href="#evennia.contrib.base_systems.components.holder.ComponentHolderMixin.signals" title="Permalink to this definition"></a></dt>
<dd></dd></dl>
</dd></dl>
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