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<section id="developer-tools">
<h1>Developer Tools<a class="headerlink" href="#developer-tools" title="Link to this heading">#</a></h1>
<p>The Edifice Runner provides some useful tools for developing Edifice applications.</p>
<p>To use the Edifice Runner, you must install the <code class="code docutils literal notranslate"><span class="pre">watchdog</span></code> package.</p>
<div class="highlight-shell notranslate"><div class="highlight"><pre><span></span>pip<span class="w"> </span>install<span class="w"> </span>watchdog
</pre></div>
</div>
<section id="dynamic-hot-reload">
<h2>Dynamic hot-reload<a class="headerlink" href="#dynamic-hot-reload" title="Link to this heading">#</a></h2>
<figure class="align-default">
<img alt="_images/edifice-workflow.gif" src="_images/edifice-workflow.gif" />
</figure>
<p>To enable dynamic hot-reload, run your application through the Edifice Runner.
On the command line:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">python</span> <span class="o">-</span><span class="n">m</span> <span class="n">edifice</span> <span class="n">path</span><span class="o">/</span><span class="n">to</span><span class="o">/</span><span class="n">your</span><span class="o">/</span><span class="n">app</span><span class="o">.</span><span class="n">py</span> <span class="n">MyRootElement</span>
</pre></div>
</div>
<p>This will run <code class="code docutils literal notranslate"><span class="pre">app.py</span></code>, mounting the <code class="code docutils literal notranslate"><span class="pre">MyRootElement</span></code> as the root,
listening to changes to all Python files contained in
path/to/your (and recursively in all sub directories)
and dynamically reloading all changes.</p>
<p>If you want to explicitly specify another path to listen to, use the <code class="code docutils literal notranslate"><span class="pre">--dir</span></code> flag:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">python</span> <span class="o">-</span><span class="n">m</span> <span class="n">edifice</span> <span class="o">--</span><span class="nb">dir</span> <span class="n">directory</span><span class="o">/</span><span class="n">to</span><span class="o">/</span><span class="n">watch</span> <span class="n">path</span><span class="o">/</span><span class="n">to</span><span class="o">/</span><span class="n">your</span><span class="o">/</span><span class="n">app</span><span class="o">.</span><span class="n">py</span> <span class="n">RootElement</span>
</pre></div>
</div>
<div class="admonition caution">
<p class="admonition-title">Caution</p>
<p>It is important to import the module directly, via <code class="code docutils literal notranslate"><span class="pre">import</span> <span class="pre">path.to.module</span> <span class="pre">as</span> <span class="pre">module</span></code>
or <code class="code docutils literal notranslate"><span class="pre">from</span> <span class="pre">path.to</span> <span class="pre">import</span> <span class="pre">module</span></code>. If you import the Element class directly,
e.g. <code class="code docutils literal notranslate"><span class="pre">from</span> <span class="pre">path.to.module</span> <span class="pre">import</span> <span class="pre">MyElement</span></code>, all references to MyElement will permanently point
to the original version.</p>
</div>
<p>Dyanamic hot-reload is very useful for fine-tuning the presentation styles
of Elements deep within your application.
You can test if the margin should be <em>10px</em> or <em>15px</em> instantly without closing the app,
reopening it, and waiting for everything to load.</p>
<p>All unaffected component states (i.e. states of components defined outside the file) will be maintained
during hot-reload.
If you structure your program in a modular way across multiple files,
only a few components would need to be reloaded,
saving you the time of navigating through your app to get to the changed widget.</p>
<div class="admonition caution">
<p class="admonition-title">Caution</p>
<p>Dynamic hot-reload currently will not work for the root
<code class="xref py py-func docutils literal notranslate"><span class="pre">@component</span></code> which contains the <code class="xref py py-class docutils literal notranslate"><span class="pre">Window</span></code>.</p>
<p>It will only work for child components of the root component.</p>
<p>So it’s a good idea to structure your application with a
root Main <code class="xref py py-func docutils literal notranslate"><span class="pre">@component</span></code> that only contains the <code class="xref py py-class docutils literal notranslate"><span class="pre">Window</span></code>,
like this.</p>
<div class="highlight-python notranslate"><div class="highlight"><pre><span></span><span class="nd">@component</span>
<span class="k">def</span> <span class="nf">HelloWorld</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="n">Label</span><span class="p">(</span><span class="s2">"Hello, World!"</span><span class="p">)</span>
<span class="nd">@component</span>
<span class="k">def</span> <span class="nf">Main</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="k">with</span> <span class="n">Window</span><span class="p">():</span>
<span class="n">HelloWorld</span><span class="p">()</span>
<span class="k">if</span> <span class="vm">__name__</span> <span class="o">==</span> <span class="s2">"__main__"</span><span class="p">:</span>
<span class="n">App</span><span class="p">(</span><span class="n">Main</span><span class="p">())</span><span class="o">.</span><span class="n">start</span><span class="p">()</span>
</pre></div>
</div>
</div>
<p>You will find there are other limitations to dynamic hot-reload. It will work
for changes to style and layout and text, but if you make more drastic changes
like introducing new component types or changing the Hooks then the hot-reloader
often fail and then you will need to restart the application.</p>
</section>
<section id="element-inspector">
<h2>Element Inspector<a class="headerlink" href="#element-inspector" title="Link to this heading">#</a></h2>
<figure class="align-default">
<img alt="_images/inspector.png" src="_images/inspector.png" />
</figure>
<p>To launch the Element Inspector, use the <code class="code docutils literal notranslate"><span class="pre">--inspect</span></code> flag for the Edifice Runner:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">python</span> <span class="o">-</span><span class="n">m</span> <span class="n">edifice</span> <span class="o">--</span><span class="n">inspect</span> <span class="n">path</span><span class="o">/</span><span class="n">to</span><span class="o">/</span><span class="n">your</span><span class="o">/</span><span class="n">app</span><span class="o">.</span><span class="n">py</span> <span class="n">RootElement</span>
</pre></div>
</div>
<p>The Element Inspector allows you to inspect the running state of the application.
It displays the entire Element Tree, as well as the props and state of
every component.
It is like the Inspect Elements tool of web browsers
or the React inspector tool.</p>
</section>
</section>
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