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<!DOCTYPE html>
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<title>Buttons — VPython 3.2 documentation</title>
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<h1>Buttons<a class="headerlink" href="#buttons" title="Permalink to this heading">¶</a></h1>
<a class="reference internal image-reference" href="_images/button.png"><img alt="_images/button.png" src="_images/button.png" style="width: 250px;" /></a>
<p>Buttons are widgets that can be placed either in the title area or the caption area of a canvas. A click on a button invokes a function that can perform actions, including changing the text of the button or disabling it.</p>
<dl class="py function">
<dt class="sig sig-object py">
<span class="sig-name descname"><span class="pre">mybutton</span> <span class="pre">=</span> <span class="pre">button(</span> <span class="pre">bind=myaction,</span> <span class="pre">text='Click</span> <span class="pre">me!'</span> <span class="pre">)</span></span></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 the button is clicked.</p></li>
<li><p><strong>text</strong> (<em>string</em>) – Text to appear on the button</p></li>
<li><p><strong>pos</strong> (<em>attribute of canvas</em>) – Location of button. Default is scene.caption_anchor.</p></li>
<li><p><strong>color</strong> (<em>vector</em>) – Color of button text. Modifiable.</p></li>
<li><p><strong>background</strong> (<em>vector</em>) – Color of button background. Modifiable.</p></li>
<li><p><strong>disabled</strong> (<em>boolean</em>) – If True, button 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">mybutton.delete()</span></code> deletes the button.</p></li>
</ul>
</dd>
</dl>
</dd></dl>
<p>A button that changes its own color and the color of a sphere:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">ball</span> <span class="o">=</span> <span class="n">sphere</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">cyan</span><span class="p">)</span>
<span class="k">def</span> <span class="nf">changecolor</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">text</span> <span class="o">==</span> <span class="s1">'red'</span><span class="p">:</span>
<span class="n">ball</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">red</span>
<span class="n">clrbtn</span><span class="o">.</span><span class="n">background</span> <span class="o">=</span> <span class="n">color</span><span class="o">.</span><span class="n">cyan</span>
<span class="n">clrbtn</span><span class="o">.</span><span class="n">text</span> <span class="o">=</span> <span class="s1">'cyan'</span>
<span class="k">else</span><span class="p">:</span>
<span class="n">ball</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">clrbtn</span><span class="o">.</span><span class="n">text</span> <span class="o">=</span> <span class="s1">'red'</span>
<span class="n">clrbtn</span><span class="o">.</span><span class="n">background</span> <span class="o">=</span> <span class="n">color</span><span class="o">.</span><span class="n">red</span>
<span class="n">clrbtn</span> <span class="o">=</span> <span class="n">button</span><span class="p">(</span> <span class="n">bind</span><span class="o">=</span><span class="n">changecolor</span><span class="p">,</span> <span class="n">text</span><span class="o">=</span><span class="s1">'red'</span><span class="p">,</span> <span class="n">background</span><span class="o">=</span><span class="n">color</span><span class="o">.</span><span class="n">red</span> <span class="p">)</span>
</pre></div>
</div>
<section id="button-event-attributes">
<h2>Button Event Attributes<a class="headerlink" href="#button-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 button at the time it was clicked):</p>
<ul class="simple">
<li><p><code class="docutils literal notranslate"><span class="pre">evt.text</span></code></p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">evt.color</span></code></p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">evt.background</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>
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<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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