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| <li><a href="layoutUiEvent.html"><code>layoutUiEvent()</code></a></li> |
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| <div class="edit-this-page"><a href="https://github.com/apache/isis/edit/2.0.0-M3/api/applib/src/main/adoc/modules/applib-ant/pages/DomainObjectLayout/layoutUiEvent.adoc">Edit</a></div> |
| </div> |
| <article class="doc"> |
| <a name="section-top"></a> |
| <h1 class="page"><code>layoutUiEvent()</code></h1> |
| <div id="preamble"> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>Whenever a domain object is to be rendered, the framework fires off an layout UI event to obtain an alternative layout name with which to render the domain object. |
| This is as an alternative to implementing <a href="../../applib-methods/reserved.html#layout" class="page"><code>layout()</code></a> reserved method. |
| (If <code>layout()</code> is present, then it will take precedence).</p> |
| </div> |
| <div class="paragraph"> |
| <p>Subscribers subscribe through the <a href="../../applib-svc/EventBusService.html" class="page"><code>EventBusService</code></a> and can use obtain a reference to the domain object from the event. |
| From this they can, if they wish, specify a CSS class for the domain object using the event’s API.</p> |
| </div> |
| <div class="paragraph"> |
| <p>By default the event raised is <code>LayoutUiEvent.Default</code>. |
| For example:</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="highlightjs highlight"><code class="language-java hljs" data-lang="java">@DomainObjectLayout |
| public class ToDoItemDto { |
| // ... |
| }</code></pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>The purpose of the <code>layoutUiEvent</code> attribute is to allows a custom subclass to be emitted instead. |
| A similar attribute is available for titles and icons.</p> |
| </div> |
| <div class="paragraph"> |
| <p>For example:</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="highlightjs highlight"><code class="language-java hljs" data-lang="java">@DomainObjectLayout( |
| iconUiEvent=ToDoItemDto.LayoutUiEvent.class |
| ) |
| public class ToDoItemDto { |
| |
| public static class LayoutUiEvent extends |
| org.apache.isis.applib.events.ui.LayoutUiEvent<ToDoItemDto> { } |
| |
| // ... |
| }</code></pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>The benefit is that subscribers can be more targeted as to the events that they subscribe to.</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="subscribers"><a class="anchor" href="#subscribers"></a>Subscribers</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>Subscribers (which must be domain services) subscribe to events posted through the <a href="../../applib-svc/EventBusService.html" class="page"><code>EventBusService</code></a>.</p> |
| </div> |
| <div class="paragraph"> |
| <p>Subscribers can be either coarse-grained (if they subscribe to the top-level event type):</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="highlightjs highlight"><code class="language-java hljs" data-lang="java">import org.springframework.context.event.EventListener; |
| import org.springframework.stereotype.Service; |
| |
| @Service |
| public class SomeSubscriber { |
| @EventListener(LayoutUiEvent.class) |
| public void on(LayoutUiEvent ev) { |
| if(ev.getSource() instanceof ToDoItemDto) { |
| ... |
| } |
| } |
| }</code></pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>or can be fine-grained (by subscribing to specific event subtypes):</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="highlightjs highlight"><code class="language-java hljs" data-lang="java">import org.springframework.context.event.EventListener; |
| import org.springframework.stereotype.Service; |
| |
| @Service |
| public class SomeSubscriber { |
| @EventListner(ToDoItemDto.LayoutUiEvent.class) |
| public void on(ToDoItemDto.LayoutUiEvent ev) { |
| ... |
| } |
| }</code></pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>The subscriber should then use <code>LayoutUiEvent#setLayout(…​)</code> to actually specify the CSS class to be used.</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="default-doop-and-noop-events"><a class="anchor" href="#default-doop-and-noop-events"></a>Default, Doop and Noop events</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>If the <code>layoutUiEvent</code> attribute is not explicitly specified (is left as its default value, <code>LayoutUiEvent.Default</code>), then the framework will, by default, post an event.</p> |
| </div> |
| <div class="paragraph"> |
| <p>If this is not required, then the <code>isis.reflector.facet.domainObjectLayoutAnnotation.layoutUiEvent.postForDefault</code> configuration property can be set to "false"; this will disable posting.</p> |
| </div> |
| <div class="paragraph"> |
| <p>On the other hand, if the <code>layoutUiEvent</code> has been explicitly specified to some subclass, then an event will be posted. |
| The framework provides <code>LayoutUiEvent.Doop</code> as such a subclass, so setting the <code>layoutUiEvent</code> attribute to this class will ensure that the event to be posted, irrespective of the configuration property setting.</p> |
| </div> |
| <div class="paragraph"> |
| <p>And, conversely, the framework also provides <code>LayoutUiEvent.Noop</code>; if <code>layoutUiEvent</code> attribute is set to this class, then no event will be posted.</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="raising-events-programmatically"><a class="anchor" href="#raising-events-programmatically"></a>Raising events programmatically</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>Normally events are only raised for interactions through the UI. |
| However, events can be raised programmatically by calling the <a href="../../applib-svc/EventBusService.html" class="page"><code>EventBusService</code></a> API directly.</p> |
| </div> |
| </div> |
| </div> |
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