@ccp-nc/crystvis-js

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A Three.js based crystallographic visualisation tool

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class="main-wrapper"><section><header><h2>Events</h2></header><article><p>User interactions with a model in CrystVis-js can be customised through the definition of callbacks for <em>events</em>. This means it's possible to bind arbitrary JavaScript code to the various ways in which a user can click on an atom in the model. To do this, one needs to use the <code>.onAtomClick()</code> method of a <code>CrystVis</code> object, as well as its flags.</p><h3>Defining an event</h3><p>A custom event can be set by defining a callback function, then assigning that function to a specific click event. Here is an example:</p><pre class="prettyprint source lang-js"><code>function myCallback(atom, event) { alert(atom.element); } visualizer.onAtomClick(myCallback, CrystVis.LEFT_CLICK) </code></pre><p>This code will result in binding a function that causes a popup to show with the chemical symbol of an atom's element whenever you left click on one.</p><h3>Flags</h3><p>Which event a callback should be bound to is defined by the flags passed as the second argument to <code>.onAtomClick()</code>. These are the available flags:</p><ul><li><code>CrystVis.LEFT_CLICK</code></li><li><code>CrystVis.RIGHT_CLICK</code></li><li><code>CrystVis.MIDDLE_CLICK</code></li><li><code>CrystVis.CTRL_BUTTON</code></li><li><code>CrystVis.ALT_BUTTON</code></li><li><code>CrystVis.SHIFT_BUTTON</code></li><li><code>CrystVis.CMD_BUTTON</code></li></ul><p>Note that <code>CMD_BUTTON</code> is only used on Macs and equivalent to <code>CTRL_BUTTON</code> on other machines. These are bit flags, so they can be combined with addition or bitwise operators. For example, <code>CrystVis.LEFT_CLICK + CrystVis.SHIFT_BUTTON</code> represents a click with the shift key down. Each combinations of flags can only hold one callback function; if <code>null</code> is passed instead of a callback, default behaviour is restored.</p><h3>Default behaviour</h3><p>Most events by default are bound to nothing, mean, nothing will happen unless you define a specific behaviour for them. There are only three exceptions to this:</p><ul><li><code>CrystVis.LEFT_CLICK</code> defaults to selecting the clicked atom</li><li><code>CrystVis.LEFT_CLICK + CrystVis.SHIFT_BUTTON</code> defaults to adding the clicked atom to selection</li><li><code>CrystVis.LEFT_CLICK + CrystVis.CTRL_BUTTON</code> defaults to switching the clicked atom in or out of the selection</li></ul><p>To best see how the selection changes, set <code>.highlightSelected = true</code>.</p><h3>Box selection</h3><p>In addition to the various events described above, there is a special behaviour. Clicking while pressing Shift on a point that does <em>not</em> have an atom allows the user to drag a box around multiple atoms, for example to select them in group. This behaviour can also be customized, by setting a callback with the method <code>.onAtomBox()</code>. Here is an example:</p><pre class="prettyprint source lang-js"><code>function boxCallback(atomview) { alert(atomview.map((atom) => atom.element)); } visualizer.onAtomBox(boxCallback) </code></pre><p>that will create an alert popup with a list of all the elements in the selected box.</p></article></section></div></div></div><div class="search-container" id="PkfLWpAbet" style="display:none"><div class="wrapper" id="iCxFxjkHbP"><button class="icon-button search-close-button" id="VjLlGakifb" aria-label="close search"><svg><use xlink:href="#close-icon"></use></svg></button><div class="search-box-c"><svg><use xlink:href="#search-icon"></use></svg> <input type="text" id="vpcKVYIppa" class="search-input" placeholder="Search..." autofocus></div><div class="search-result-c" id="fWwVHRuDuN"><span class="search-result-c-text">Type anything to view search result</span></div></div></div><div class="mobile-menu-icon-container"><button class="icon-button" id="mobile-menu" data-isopen="false" aria-label="menu"><svg><use xlink:href="#menu-icon"></use></svg></button></div><div id="mobile-sidebar" class="mobile-sidebar-container"><div class="mobile-sidebar-wrapper"><div class="mobile-nav-links"></div><div class="mobile-sidebar-items-c"><div class="sidebar-section-title with-arrow" data-isopen="false" id="sidebar-modules"><div>Modules</div><svg><use xlink:href="#down-icon"></use></svg></div><div class="sidebar-section-children-container"><div class="sidebar-section-children"><a href="lib_model.module_js.html">lib/model.js</a></div><div class="sidebar-section-children"><a href="lib_modelview.module_js.html">lib/modelview.js</a></div><div class="sidebar-section-children"><a href="lib_visualizer.module_js.html">lib/visualizer.js</a></div></div><div class="sidebar-section-title with-arrow" data-isopen="false" id="sidebar-classes"><div>Classes</div><svg><use xlink:href="#down-icon"></use></svg></div><div class="sidebar-section-children-container"><div class="sidebar-section-children"><a href="lib_model.module_js-AtomImage.html">AtomImage</a></div><div class="sidebar-section-children"><a href="lib_model.module_js-BondImage.html">BondImage</a></div><div class="sidebar-section-children"><a href="lib_model.module_js-Model.html">Model</a></div><div class="sidebar-section-children"><a href="lib_modelview.module_js-ModelView.html">ModelView</a></div><div class="sidebar-section-children"><a href="lib_visualizer.module_js-CrystVis.html">CrystVis</a></div></div><div class="sidebar-section-title with-arrow" data-isopen="false" id="sidebar-tutorials"><div>Tutorials</div><svg><use xlink:href="#down-icon"></use></svg></div><div class="sidebar-section-children-container"><div class="sidebar-section-children"><a href="tutorial-Events.html">Events</a></div><div class="sidebar-section-children"><a href="tutorial-Queries.html">Queries</a></div><div class="sidebar-section-children"><a href="tutorial-ThreejsMigration.html">ThreejsMigration</a></div></div></div><div class="mobile-navbar-actions"><div class="navbar-right-item"><button class="icon-button search-button" aria-label="open-search"><svg><use xlink:href="#search-icon"></use></svg></button></div><div class="navbar-right-item"><button class="icon-button theme-toggle" aria-label="toggle-theme"><svg><use class="theme-svg-use" xlink:href="#light-theme-icon"></use></svg></button></div><div class="navbar-right-item"><button class="icon-button font-size" aria-label="change-font-size"><svg><use xlink:href="#font-size-icon"></use></svg></button></div></div></div></div><script type="text/javascript" src="scripts/core.min.js"></script><script src="scripts/search.min.js" defer="defer"></script><script src="scripts/third-party/fuse.js" defer="defer"></script><script type="text/javascript">var tocbotInstance=tocbot.init({tocSelector:"#eed4d2a0bfd64539bb9df78095dec881",contentSelector:".main-content",headingSelector:"h1, h2, h3",hasInnerContainers:!0,scrollContainer:".main-content",headingsOffset:130,onClick:bringLinkToView})</script></body></html>