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| <h1 class="page">Highlight Current Row</h1> |
| <div class="paragraph"> |
| <p>Demo App: Highlighting Current |
| As a by-the-by, the demo app has one further "trick up its sleeve". |
| If you run the app you’ll notice that the currently selected <code>DemoObject</code> is highlighted in the left-hand table of the <code>HomePageViewModel</code>.</p> |
| </div> |
| <div class="paragraph"> |
| <p>This is accomplished by having the view model collaborate with a subscribing domain service that configures a CSS class.</p> |
| </div> |
| <div class="paragraph"> |
| <p>We start by ensuring that the <code>DemoObject</code> emits an event for its CSS class:</p> |
| </div> |
| <div class="listingblock"> |
| <div class="title">DemoObject.java</div> |
| <div class="content"> |
| <pre class="highlightjs highlight"><code class="language-java hljs" data-lang="java">@DomainObjectLayout( |
| ... |
| cssClassUiEvent = DemoObject.CssClassUiEvent.class |
| ) |
| public class DemoObject ... { |
| |
| public static class CssClassUiEvent |
| extends org.apache.isis.applib.events.ui.CssClassUiEvent<DemoObject> {} |
| ... |
| }</code></pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>Next, we define the domain service to act as the subscriber:</p> |
| </div> |
| <div class="listingblock"> |
| <div class="title">HomePageViewModel.java</div> |
| <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; |
| |
| public class HomePageViewModel { |
| |
| @Service |
| public static class CssHighlighter { |
| @EventListener(DemoObject.CssClassUiEvent.class) |
| public void on(DemoObject.CssClassUiEvent ev) { |
| if(getContext() == null) { return; } |
| if(ev.getSource() == getContext().getSelected()) { <i class="conum" data-value="1"></i><b>(1)</b> |
| ev.setCssClass("selected"); |
| } |
| } |
| private HomePageViewModel getContext() { <i class="conum" data-value="2"></i><b>(2)</b> |
| return (HomePageViewModel) scratchpad.get("context"); |
| } |
| void setContext(final HomePageViewModel homePageViewModel) { |
| scratchpad.put("context", homePageViewModel); |
| } |
| @Inject |
| Scratchpad scratchpad; <i class="conum" data-value="3"></i><b>(3)</b> |
| } |
| |
| }</code></pre> |
| </div> |
| </div> |
| <div class="colist arabic"> |
| <table> |
| <tr> |
| <td><i class="conum" data-value="1"></i><b>1</b></td> |
| <td>If the domain object is the currently selected then set the CSS class</td> |
| </tr> |
| <tr> |
| <td><i class="conum" data-value="2"></i><b>2</b></td> |
| <td>Provide methods to set and get the current <code>HomePageViewModel</code> (acting as the context)</td> |
| </tr> |
| <tr> |
| <td><i class="conum" data-value="3"></i><b>3</b></td> |
| <td>Store the context using the <code>Scratchpad</code> domain service (request-scoped so thread-safe).</td> |
| </tr> |
| </table> |
| </div> |
| <div class="paragraph"> |
| <p>The <code>HomePageViewModel</code> is responsible for setting itself as the context for the domain service:</p> |
| </div> |
| <div class="listingblock"> |
| <div class="title">HomePageViewModel.java</div> |
| <div class="content"> |
| <pre class="highlightjs highlight"><code class="language-java hljs" data-lang="java">public class HomePageViewModel ... { |
| ... |
| public TranslatableString title() { |
| cssHighlighter.setContext(this); <i class="conum" data-value="1"></i><b>(1)</b> |
| ... |
| } |
| ... |
| @javax.inject.Inject |
| CssHighlighter cssHighlighter; |
| }</code></pre> |
| </div> |
| </div> |
| <div class="colist arabic"> |
| <table> |
| <tr> |
| <td><i class="conum" data-value="1"></i><b>1</b></td> |
| <td>set the context on the domain service</td> |
| </tr> |
| </table> |
| </div> |
| <div class="paragraph"> |
| <p>Finally we just need some CSS, in the <code>application.css</code> file:</p> |
| </div> |
| <div class="listingblock"> |
| <div class="title">application.css</div> |
| <div class="content"> |
| <pre class="highlightjs highlight"><code class="language-css hljs" data-lang="css">.selected { |
| font-style: italic; font-weight: bolder; |
| }</code></pre> |
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