@aidinabedi/playcanvas

<!doctype html> <html lang="en"> <head> <title>pc.LayoutGroupComponent | PlayCanvas API Reference</title> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <link rel="icon" type="image/png" href="images/playcanvas-favicon.png"> <link href="styles/styles.css" rel="stylesheet"> <link href="styles/playcanvas-theme.css" rel="stylesheet"> <script src="scripts/interface.js"></script> <script src="scripts/highlight.min.js"></script> <script>hljs.initHighlightingOnLoad();</script> </head> <body> <header> <nav class="header-width"> <a href="/" class="header-title"><img src="images/playcanvas-manual.png"></a> <ul class="header-menu"> <li class="user-manual"><a href="https://developer.playcanvas.com/en/user-manual/">User Manual</a></li> <li class="tutorials"><a href="https://developer.playcanvas.com/en/tutorials">Tutorials</a></li> <li class="forum"><a href="https://forum.playcanvas.com/" target="_blank">Forum</a></li> <li class="api active"><a href="/api/">API 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href="pc.Tags.html">Tags</a></li> <li id="nav-pc.Texture"><a href="pc.Texture.html">Texture</a></li> <li id="nav-pc.TextureAtlas"><a href="pc.TextureAtlas.html">TextureAtlas</a></li> <li id="nav-pc.TextureAtlasHandler"><a href="pc.TextureAtlasHandler.html">TextureAtlasHandler</a></li> <li id="nav-pc.TextureHandler"><a href="pc.TextureHandler.html">TextureHandler</a></li> <li id="nav-pc.Touch"><a href="pc.Touch.html">Touch</a></li> <li id="nav-pc.TouchDevice"><a href="pc.TouchDevice.html">TouchDevice</a></li> <li id="nav-pc.TouchEvent"><a href="pc.TouchEvent.html">TouchEvent</a></li> <li id="nav-pc.TransformFeedback"><a href="pc.TransformFeedback.html">TransformFeedback</a></li> <li id="nav-pc.Vec2"><a href="pc.Vec2.html">Vec2</a></li> <li id="nav-pc.Vec3"><a href="pc.Vec3.html">Vec3</a></li> <li id="nav-pc.Vec4"><a href="pc.Vec4.html">Vec4</a></li> <li id="nav-pc.VertexAttributeDescription"><a href="pc.VertexAttributeDescription.html">VertexAttributeDescription</a></li> <li id="nav-pc.VertexAttributeElement"><a href="pc.VertexAttributeElement.html">VertexAttributeElement</a></li> <li id="nav-pc.VertexBuffer"><a href="pc.VertexBuffer.html">VertexBuffer</a></li> <li id="nav-pc.VertexFormat"><a href="pc.VertexFormat.html">VertexFormat</a></li> <li id="nav-pc.VertexIterator"><a href="pc.VertexIterator.html">VertexIterator</a></li> <li id="nav-pc.VertexIteratorAccessor"><a href="pc.VertexIteratorAccessor.html">VertexIteratorAccessor</a></li> <li id="nav-pc.XrInput"><a href="pc.XrInput.html">XrInput</a></li> <li id="nav-pc.XrInputSource"><a href="pc.XrInputSource.html">XrInputSource</a></li> <li id="nav-pc.XrManager"><a href="pc.XrManager.html">XrManager</a></li> </ul> </nav> <div class='sidebarToggle'><span></span>Class List</div> <main class="cls"> <h1>pc.LayoutGroupComponent</h1> <p class="extends">Extends: <a href="pc.Component.html">pc.Component</a></p> <p><p>A LayoutGroupComponent enables the Entity to position and scale child <a href="pc.ElementComponent.html">pc.ElementComponent</a>s according to configurable layout rules.</p></p>  <h1>Summary</h1>     <h3>Properties</h3> <table class="properties"> <tr> <td><a href="#alignment">alignment</a></td><td><p>Specifies the horizontal and vertical alignment of child elements.</td> </tr> <tr> <td><a href="#heightFitting">heightFitting</a></td><td><p>Identical to pc.LayoutGroupComponent#widthFitting but for the Y axis.</td> </tr> <tr> <td><a href="#orientation">orientation</a></td><td><p>Whether the layout should run horizontally or vertically.</td> </tr> <tr> <td><a href="#padding">padding</a></td><td><p>Padding to be applied inside the container before positioning any children.</td> </tr> <tr> <td><a href="#reverseX">reverseX</a></td><td><p>Reverses the order of children along the x axis.</td> </tr> <tr> <td><a href="#reverseY">reverseY</a></td><td><p>Reverses the order of children along the y axis.</td> </tr> <tr> <td><a href="#spacing">spacing</a></td><td><p>Spacing to be applied between each child element.</td> </tr> <tr> <td><a href="#widthFitting">widthFitting</a></td><td><p>Fitting logic to be applied when positioning and scaling child elements.</td> </tr> <tr> <td><a href="#wrap">wrap</a></td><td><p>Whether or not to wrap children onto a new row/column when the size of the container is exceeded.</td> </tr> </table>   <h2>Inherited</h2>   <h3>Properties</h3> <table class="properties"> <tr> <td><a href="#enabled">enabled</a></td><td><p>Enables or disables the component.</td> </tr> <tr> <td><a href="#entity">entity</a></td><td><p>The Entity that this Component is attached to.</td> </tr> <tr> <td><a href="#system">system</a></td><td><p>The ComponentSystem used to create this Component.</td> </tr> </table>  <h3>Methods</h3> <table class="properties"> <tr> <td><a href="#fire">fire</a></td><td><p>Fire an event, all additional arguments are passed on to the event listener.</td> </tr> <tr> <td><a href="#hasEvent">hasEvent</a></td><td><p>Test if there are any handlers bound to an event name.</td> </tr> <tr> <td><a href="#off">off</a></td><td><p>Detach an event handler from an event.</td> </tr> <tr> <td><a href="#on">on</a></td><td><p>Attach an event handler to an event.</td> </tr> <tr> <td><a href="#once">once</a></td><td><p>Attach an event handler to an event.</td> </tr> </table>  <h1>Details</h1>    <h2>Constructor</h2>  <div id="LayoutGroupComponent"> <h3 class="methodname">LayoutGroupComponent(system, entity) <a class="font-icon" href="#LayoutGroupComponent"></a></h3> <p><p>Create a new LayoutGroupComponent.</p></p> <h4>Parameters</h4> <table> <tr> <td>system</td><td><a href="pc.LayoutGroupComponentSystem.html">pc.LayoutGroupComponentSystem</a></td><td><p>The ComponentSystem that created this Component.</p></td> </tr> <tr> <td>entity</td><td><a href="pc.Entity.html">pc.Entity</a></td><td><p>The Entity that this Component is attached to.</p></td> </tr> </table> </div>  <h2>Properties</h2> <div id="alignment"> <span class="property"><a href="pc.Vec2.html">pc.Vec2</a></span><span class="property">alignment <a class="font-icon" href="#alignment"></a></span> <p><p>Specifies the horizontal and vertical alignment of child elements. Values range from 0 to 1 where [0, 0] is the bottom left and [1, 1] is the top right. Defaults to [0, 1].</p></p> </div> <div id="heightFitting"> <span class="property"><a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number">number</a></span><span class="property">heightFitting <a class="font-icon" href="#heightFitting"></a></span> <p><p>Identical to pc.LayoutGroupComponent#widthFitting but for the Y axis. Defaults to pc.FITTING_NONE.</p></p> </div> <div id="orientation"> <span class="property"><a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number">number</a></span><span class="property">orientation <a class="font-icon" href="#orientation"></a></span> <p><p>Whether the layout should run horizontally or vertically. Can be:</p> <ul> <li><a href="pc.html#ORIENTATION_HORIZONTAL">pc.ORIENTATION_HORIZONTAL</a></li> <li><a href="pc.html#ORIENTATION_VERTICAL">pc.ORIENTATION_VERTICAL</a></li> </ul> <p>Defaults to pc.ORIENTATION_HORIZONTAL.</p></p> </div> <div id="padding"> <span class="property"><a href="pc.Vec4.html">pc.Vec4</a></span><span class="property">padding <a class="font-icon" href="#padding"></a></span> <p><p>Padding to be applied inside the container before positioning any children. Specified as left, bottom, right and top values. Defaults to [0, 0, 0, 0] (no padding).</p></p> </div> <div id="reverseX"> <span class="property"><a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Boolean">boolean</a></span><span class="property">reverseX <a class="font-icon" href="#reverseX"></a></span> <p><p>Reverses the order of children along the x axis. Defaults to false.</p></p> </div> <div id="reverseY"> <span class="property"><a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Boolean">boolean</a></span><span class="property">reverseY <a class="font-icon" href="#reverseY"></a></span> <p><p>Reverses the order of children along the y axis. Defaults to true.</p></p> </div> <div id="spacing"> <span class="property"><a href="pc.Vec2.html">pc.Vec2</a></span><span class="property">spacing <a class="font-icon" href="#spacing"></a></span> <p><p>Spacing to be applied between each child element. Defaults to [0, 0] (no spacing).</p></p> </div> <div id="widthFitting"> <span class="property"><a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number">number</a></span><span class="property">widthFitting <a class="font-icon" href="#widthFitting"></a></span> <p><p>Fitting logic to be applied when positioning and scaling child elements. Can be:</p> <ul> <li><a href="pc.html#FITTING_NONE">pc.FITTING_NONE</a>: Child elements will be rendered at their natural size.</li> <li><a href="pc.html#FITTING_STRETCH">pc.FITTING_STRETCH</a>: When the natural size of all child elements does not fill the width of the container, children will be stretched to fit. The rules for how each child will be stretched are outlined below: <ol> <li>Sum the pc.LayoutChildComponent#fitWidthProportion values of each child and normalize so that all values sum to 1.</li> <li>Apply the natural width of each child.</li> <li>If there is space remaining in the container, distribute it to each child based on the normalized pc.LayoutChildComponent#fitWidthProportion values, but do not exceed the pc.LayoutChildComponent#maxWidth of each child.</li> </ol> </li> <li><a href="pc.html#FITTING_SHRINK">pc.FITTING_SHRINK</a>: When the natural size of all child elements overflows the width of the container, children will be shrunk to fit. The rules for how each child will be stretched are outlined below: <ol> <li>Sum the pc.LayoutChildComponent#fitWidthProportion values of each child and normalize so that all values sum to 1.</li> <li>Apply the natural width of each child.</li> <li>If the new total width of all children exceeds the available space of the container, reduce each child's width proportionally based on the normalized pc.LayoutChildComponent#fitWidthProportion values, but do not exceed the pc.LayoutChildComponent#minWidth of each child.</li> </ol> </li> <li><a href="pc.html#FITTING_BOTH">pc.FITTING_BOTH</a>: Applies both STRETCH and SHRINK logic as necessary.</li> </ul> <p>Defaults to pc.FITTING_NONE.</p></p> </div> <div id="wrap"> <span class="property"><a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Boolean">boolean</a></span><span class="property">wrap <a class="font-icon" href="#wrap"></a></span> <p><p>Whether or not to wrap children onto a new row/column when the size of the container is exceeded. Defaults to false, which means that children will be be rendered in a single row (horizontal orientation) or column (vertical orientation). Note that setting wrap to true makes it impossible for the <a href="pc.html#FITTING_BOTH">pc.FITTING_BOTH</a> fitting mode to operate in any logical manner. For this reason, when wrap is true, a pc.LayoutGroupComponent#widthFitting or pc.LayoutGroupComponent#heightFitting mode of <a href="pc.html#FITTING_BOTH">pc.FITTING_BOTH</a> will be coerced to <a href="pc.html#FITTING_STRETCH">pc.FITTING_STRETCH</a>.</p></p> </div>   <h2>Inherited</h2>  <h2>Properties</h2> <div id="enabled"> <span class="property"><a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Boolean">boolean</a></span><span class="property">enabled <a class="font-icon" href="#enabled"></a></span> <p><p>Enables or disables the component.</p></p> </div> <div id="entity"> <span class="property"><a href="pc.Entity.html">pc.Entity</a></span><span class="property">entity <a class="font-icon" href="#entity"></a></span> <p><p>The Entity that this Component is attached to.</p></p> </div> <div id="system"> <span class="property"><a href="pc.ComponentSystem.html">pc.ComponentSystem</a></span><span class="property">system <a class="font-icon" href="#system"></a></span> <p><p>The ComponentSystem used to create this Component.</p></p> </div>  <h2>Methods</h2> <div id="fire"> <h3 class="methodname">fire(name, [arg1], [arg2], [arg3], [arg4], [arg5], [arg6], [arg7], [arg8]) <a class="font-icon" href="#fire"></a></h3> <p><p>Fire an event, all additional arguments are passed on to the event listener.</p></p> <pre><code class="javascript">obj.fire('test', 'This is the message');</code></pre> <h4>Parameters</h4> <table> <tr> <td>name</td><td><a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object">object</a></td><td><p>Name of event to fire.</p></td> </tr> <tr> <td>arg1</td><td><a href="#">*</a></td><td><p>First argument that is passed to the event handler.</p></td> </tr> <tr> <td>arg2</td><td><a href="#">*</a></td><td><p>Second argument that is passed to the event handler.</p></td> </tr> <tr> <td>arg3</td><td><a href="#">*</a></td><td><p>Third argument that is passed to the event handler.</p></td> </tr> <tr> <td>arg4</td><td><a href="#">*</a></td><td><p>Fourth argument that is passed to the event handler.</p></td> </tr> <tr> <td>arg5</td><td><a href="#">*</a></td><td><p>Fifth argument that is passed to the event handler.</p></td> </tr> <tr> <td>arg6</td><td><a href="#">*</a></td><td><p>Sixth argument that is passed to the event handler.</p></td> </tr> <tr> <td>arg7</td><td><a href="#">*</a></td><td><p>Seventh argument that is passed to the event handler.</p></td> </tr> <tr> <td>arg8</td><td><a href="#">*</a></td><td><p>Eighth argument that is passed to the event handler.</p></td> </tr> </table> <h4>Returns</h4> <a href="pc.EventHandler.html">pc.EventHandler</a> <p>Self for chaining.</p> </div> <div id="hasEvent"> <h3 class="methodname">hasEvent(name) <a class="font-icon" href="#hasEvent"></a></h3> <p><p>Test if there are any handlers bound to an event name.</p></p> <pre><code class="javascript">obj.on('test', function () { }); // bind an event to 'test' obj.hasEvent('test'); // returns true obj.hasEvent('hello'); // returns false</code></pre> <h4>Parameters</h4> <table> <tr> <td>name</td><td><a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String">string</a></td><td><p>The name of the event to test.</p></td> </tr> </table> <h4>Returns</h4> <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Boolean">boolean</a> <p>True if the object has handlers bound to the specified event name.</p> </div> <div id="off"> <h3 class="methodname">off([name], [callback], [scope]) <a class="font-icon" href="#off"></a></h3> <p><p>Detach an event handler from an event. If callback is not provided then all callbacks are unbound from the event, if scope is not provided then all events with the callback will be unbound.</p></p> <pre><code class="javascript">var handler = function () { }; obj.on('test', handler); obj.off(); // Removes all events obj.off('test'); // Removes all events called 'test' obj.off('test', handler); // Removes all handler functions, called 'test' obj.off('test', handler, this); // Removes all hander functions, called 'test' with scope this</code></pre> <h4>Parameters</h4> <table> <tr> <td>name</td><td><a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String">string</a></td><td><p>Name of the event to unbind.</p></td> </tr> <tr> <td>callback</td><td><a href="pc.callbacks.html#HandleEvent">pc.callbacks.HandleEvent</a></td><td><p>Function to be unbound.</p></td> </tr> <tr> <td>scope</td><td><a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object">object</a></td><td><p>Scope that was used as the this when the event is fired.</p></td> </tr> </table> <h4>Returns</h4> <a href="pc.EventHandler.html">pc.EventHandler</a> <p>Self for chaining.</p> </div> <div id="on"> <h3 class="methodname">on(name, callback, [scope]) <a class="font-icon" href="#on"></a></h3> <p><p>Attach an event handler to an event.</p></p> <pre><code class="javascript">obj.on('test', function (a, b) { console.log(a + b); }); obj.fire('test', 1, 2); // prints 3 to the console</code></pre> <h4>Parameters</h4> <table> <tr> <td>name</td><td><a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String">string</a></td><td><p>Name of the event to bind the callback to.</p></td> </tr> <tr> <td>callback</td><td><a href="pc.callbacks.html#HandleEvent">pc.callbacks.HandleEvent</a></td><td><p>Function that is called when event is fired. Note the callback is limited to 8 arguments.</p></td> </tr> <tr> <td>scope</td><td><a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object">object</a></td><td><p>Object to use as 'this' when the event is fired, defaults to current this.</p></td> </tr> </table> <h4>Returns</h4> <a href="pc.EventHandler.html">pc.EventHandler</a> <p>Self for chaining.</p> </div> <div id="once"> <h3 class="methodname">once(name, callback, [scope]) <a class="font-icon" href="#once"></a></h3> <p><p>Attach an event handler to an event. This handler will be removed after being fired once.</p></p> <pre><code class="javascript">obj.once('test', function (a, b) { console.log(a + b); }); obj.fire('test', 1, 2); // prints 3 to the console obj.fire('test', 1, 2); // not going to get handled</code></pre> <h4>Parameters</h4> <table> <tr> <td>name</td><td><a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String">string</a></td><td><p>Name of the event to bind the callback to.</p></td> </tr> <tr> <td>callback</td><td><a href="pc.callbacks.html#HandleEvent">pc.callbacks.HandleEvent</a></td><td><p>Function that is called when event is fired. Note the callback is limited to 8 arguments.</p></td> </tr> <tr> <td>scope</td><td><a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object">object</a></td><td><p>Object to use as 'this' when the event is fired, defaults to current this.</p></td> </tr> </table> <h4>Returns</h4> <a href="pc.EventHandler.html">pc.EventHandler</a> <p>Self for chaining.</p> </div>  </main> </div> </body> </html>