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<!DOCTYPE html>
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<meta name="viewport" content="width=device-width, initial-scale=1.0" /><meta name="generator" content="Docutils 0.18.1: http://docutils.sourceforge.net/" />
<title>Menus — VPython 3.2 documentation</title>
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<section id="menus">
<h1>Menus<a class="headerlink" href="#menus" title="Permalink to this heading">¶</a></h1>
<img alt="_images/menu.png" src="_images/menu.png" />
<p>A menu widget provides a drop-down menu.</p>
<dl class="py function">
<dt class="sig sig-object py" id="menu">
<span class="sig-name descname"><span class="pre">menu</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">bind</span></span><span class="o"><span class="pre">=</span></span><span class="default_value"><span class="pre">myfunction</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">choices</span></span><span class="o"><span class="pre">=</span></span><span class="default_value"><span class="pre">choicelist</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#menu" title="Permalink to this definition">¶</a></dt>
<dd><dl class="field-list simple">
<dt class="field-odd">Parameters<span class="colon">:</span></dt>
<dd class="field-odd"><ul class="simple">
<li><p><strong>bind</strong> (<em>function</em>) – The function to be called when a menu selection is made.</p></li>
<li><p><strong>choices</strong> (<em>list</em>) – The list of options (as strings) to appear on the menu.</p></li>
<li><p><strong>selected</strong> (<em>string</em>) – The text of the currently selected menu option.</p></li>
<li><p><strong>index</strong> (<em>scalar</em>) – The list position of the currently selected option.</p></li>
<li><p><strong>disabled</strong> (<em>boolean</em>) – If True, menu is grayed out and does not respond.</p></li>
<li><p><strong>delete</strong><strong>(</strong><strong>)</strong> – <code class="docutils literal notranslate"><span class="pre">mymenu.delete()</span></code> deletes the menu.</p></li>
</ul>
</dd>
</dl>
</dd></dl>
<p>The following code creates a menu to change the color of an object:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">pointer</span> <span class="o">=</span> <span class="n">arrow</span><span class="p">(</span><span class="n">pos</span><span class="o">=</span><span class="n">vec</span><span class="p">(</span><span class="o">-</span><span class="mi">3</span><span class="p">,</span><span class="o">-</span><span class="mi">3</span><span class="p">,</span><span class="mi">0</span><span class="p">),</span> <span class="n">axis</span><span class="o">=</span><span class="n">vec</span><span class="p">(</span><span class="mi">6</span><span class="p">,</span><span class="mi">6</span><span class="p">,</span><span class="mi">0</span><span class="p">),</span> <span class="n">color</span><span class="o">=</span><span class="n">color</span><span class="o">.</span><span class="n">white</span> <span class="p">)</span>
<span class="k">def</span> <span class="nf">changeattr</span><span class="p">(</span><span class="n">evt</span><span class="p">):</span>
<span class="n">console</span><span class="o">.</span><span class="n">log</span><span class="p">(</span><span class="n">evt</span><span class="p">)</span>
<span class="k">if</span> <span class="n">evt</span><span class="o">.</span><span class="n">index</span> <span class="o"><</span> <span class="mi">1</span><span class="p">:</span>
<span class="k">pass</span>
<span class="k">elif</span> <span class="n">evt</span><span class="o">.</span><span class="n">index</span> <span class="ow">is</span> <span class="mi">1</span><span class="p">:</span>
<span class="n">pointer</span><span class="o">.</span><span class="n">color</span><span class="o">=</span><span class="n">color</span><span class="o">.</span><span class="n">yellow</span>
<span class="k">elif</span> <span class="n">evt</span><span class="o">.</span><span class="n">index</span> <span class="ow">is</span> <span class="mi">2</span><span class="p">:</span>
<span class="n">pointer</span><span class="o">.</span><span class="n">color</span><span class="o">=</span><span class="n">color</span><span class="o">.</span><span class="n">magenta</span>
<span class="k">elif</span> <span class="n">evt</span><span class="o">.</span><span class="n">index</span> <span class="ow">is</span> <span class="mi">3</span><span class="p">:</span>
<span class="n">pointer</span><span class="o">.</span><span class="n">color</span><span class="o">=</span><span class="n">color</span><span class="o">.</span><span class="n">cyan</span>
<span class="n">choicelist</span> <span class="o">=</span> <span class="p">[</span><span class="s1">'Color'</span><span class="p">,</span> <span class="s1">'yellow'</span><span class="p">,</span> <span class="s1">'magenta'</span><span class="p">,</span> <span class="s1">'cyan'</span><span class="p">]</span>
<span class="n">menu</span><span class="p">(</span> <span class="n">choices</span><span class="o">=</span><span class="n">choicelist</span><span class="p">,</span> <span class="n">bind</span><span class="o">=</span><span class="n">changeattr</span> <span class="p">)</span>
</pre></div>
</div>
<section id="menu-event-attributes">
<h2>Menu Event Attributes<a class="headerlink" href="#menu-event-attributes" title="Permalink to this heading">¶</a></h2>
<p>The argument of the event handler function (‘evt’, in the code above) will have the following attributes (properties of the menu):</p>
<ul class="simple">
<li><p><code class="docutils literal notranslate"><span class="pre">evt.index</span></code></p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">evt.selected</span></code></p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">evt.disabled</span></code></p></li>
</ul>
<p>Additionally, any attributes you have created for the widget (for example, <code class="docutils literal notranslate"><span class="pre">name</span></code> or <code class="docutils literal notranslate"><span class="pre">id</span></code>), will be available as attributes of <code class="docutils literal notranslate"><span class="pre">evt</span></code>.</p>
<div class="admonition seealso">
<p class="admonition-title">See also</p>
<p><a class="reference internal" href="userinput.html#eventhandler"><span class="std std-ref">Event Handlers</span></a>; <a class="reference internal" href="userinput.html#event-handling"><span class="std std-ref">Processing Events</span></a>; <a class="reference internal" href="userinput.html#polling"><span class="std std-ref">Polling</span></a>; <a class="reference internal" href="widgetPosition.html"><span class="doc">Widget Position</span></a></p>
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