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| <h1>Wicket 1.4.10 released</h1> |
| <p>This is the tenth maintenance release of the 1.4.x series and brings over |
| thirty bug fixes and improvements.</p> |
| |
| <p>As well as bringing bug fixes and small improvements, 1.4.10 brings two major new features: |
| * Delayed component initialization |
| * Component configuration </p> |
| |
| <p>Delayed component initialization allows developers to initialize their components outside of a constructor, when more environment is available to the component instance. From the javadoc:</p> |
| |
| <div class="highlight"><pre><code class="language-java" data-lang="java"><span class="kd">public</span> <span class="kd">class</span> <span class="nc">Component</span> <span class="o">{</span> |
| <span class="cm">/**</span> |
| <span class="cm"> * This method is meant to be used as an alternative to initialize components. Usually the</span> |
| <span class="cm"> * component's constructor is used for this task, but sometimes a component cannot be</span> |
| <span class="cm"> * initialized in isolation, it may need to access its parent component or its markup in order</span> |
| <span class="cm"> * to fully initialize. This method is invoked once per component's lifecycle when a path exists</span> |
| <span class="cm"> * from this component to the {@link Page} thus providing the component with an atomic callback</span> |
| <span class="cm"> * when the component's environment is built out.</span> |
| <span class="cm"> * <p></span> |
| <span class="cm"> * Overrides must call super#{@link #onInitialize()}. Usually this should be the first thing an</span> |
| <span class="cm"> * override does, much like a constructor.</span> |
| <span class="cm"> * </p></span> |
| <span class="cm"> * <p></span> |
| <span class="cm"> * Parent containers are guaranteed to be initialized before their children</span> |
| <span class="cm"> * </p></span> |
| <span class="cm"> * <p></span> |
| <span class="cm"> * It is safe to use {@link #getPage()} in this method</span> |
| <span class="cm"> * </p></span> |
| <span class="cm"> * </span> |
| <span class="cm"> * <p></span> |
| <span class="cm"> * NOTE:The timing of this call is not precise, the contract is that it is called sometime</span> |
| <span class="cm"> * before {@link Component#onBeforeRender()}.</span> |
| <span class="cm"> * </p></span> |
| <span class="cm"> * </span> |
| <span class="cm"> */</span> |
| <span class="kd">protected</span> <span class="kt">void</span> <span class="nf">onInitialize</span><span class="o">()</span> <span class="o">{}</span> |
| <span class="o">}</span></code></pre></div> |
| |
| <p>Component configuration allows developers to easier configure component states such as visibility, enabled, etc. From the javadoc:</p> |
| |
| <div class="highlight"><pre><code class="language-java" data-lang="java"><span class="kd">public</span> <span class="kd">class</span> <span class="nc">Component</span> <span class="o">{</span> |
| <span class="cm">/**</span> |
| <span class="cm"> * Called once per request on components before they are about to be rendered. This method</span> |
| <span class="cm"> * should be used to configure such things as visibility and enabled flags.</span> |
| <span class="cm"> * <p></span> |
| <span class="cm"> * Overrides must call {@code super.onConfigure()}, usually before any other code</span> |
| <span class="cm"> * </p></span> |
| <span class="cm"> * <p></span> |
| <span class="cm"> * NOTE: Component hierarchy should not be modified inside this method, instead it should be</span> |
| <span class="cm"> * done in {@link #onBeforeRender()}</span> |
| <span class="cm"> * </p></span> |
| <span class="cm"> * <p></span> |
| <span class="cm"> * NOTE: Why this method is preferrable to directly overriding {@link #isVisible()} and</span> |
| <span class="cm"> * {@link #isEnabled()}? Because those methods are called multiple times even for processing of</span> |
| <span class="cm"> * a single request. If they contain expensive logic they can slow down the response time of the</span> |
| <span class="cm"> * entire page. Further, overriding those methods directly on form components may lead to</span> |
| <span class="cm"> * inconsistent or unexpected state depending on when those methods are called in the form</span> |
| <span class="cm"> * processing workflow. It is a better practice to push changes to state rather than pull.</span> |
| <span class="cm"> * </p></span> |
| <span class="cm"> * <p></span> |
| <span class="cm"> * NOTE: If component's visibility or another property depends on another component you may call</span> |
| <span class="cm"> * {@code other.configure()} followed by {@code other.isVisible()} as mentioned in</span> |
| <span class="cm"> * {@link #configure()} javadoc.</span> |
| <span class="cm"> * </p></span> |
| <span class="cm"> * <p></span> |
| <span class="cm"> * NOTE: Why should {@link #onBeforeRender()} not be used for this? Because if visibility of a</span> |
| <span class="cm"> * component is toggled inside {@link #onBeforeRender()} another method needs to be overridden</span> |
| <span class="cm"> * to make sure {@link #onBeforeRender()} will be invoked on ivisible components:</span> |
| <span class="cm"> * </span> |
| <span class="cm"> * <pre></span> |
| <span class="cm"> * class MyComponent extends WebComponent</span> |
| <span class="cm"> * {</span> |
| <span class="cm"> * protected void onBeforeRender()</span> |
| <span class="cm"> * {</span> |
| <span class="cm"> * setVisible(Math.rand() &gt; 0.5f);</span> |
| <span class="cm"> * super.onBeforeRender();</span> |
| <span class="cm"> * }</span> |
| <span class="cm"> * </span> |
| <span class="cm"> * // if this override is forgotten, once invisible component will never become visible</span> |
| <span class="cm"> * protected boolean callOnBeforeRenderIfNotVisible()</span> |
| <span class="cm"> * {</span> |
| <span class="cm"> * return true;</span> |
| <span class="cm"> * }</span> |
| <span class="cm"> * }</span> |
| <span class="cm"> * </pre></span> |
| <span class="cm"> * </span> |
| <span class="cm"> * VS</span> |
| <span class="cm"> * </span> |
| <span class="cm"> * <pre></span> |
| <span class="cm"> * class MyComponent extends WebComponent</span> |
| <span class="cm"> * {</span> |
| <span class="cm"> * protected void onConfigure()</span> |
| <span class="cm"> * {</span> |
| <span class="cm"> * setVisible(Math.rand() &gt; 0.5f);</span> |
| <span class="cm"> * super.onConfigure();</span> |
| <span class="cm"> * }</span> |
| <span class="cm"> * }</span> |
| <span class="cm"> * </pre></span> |
| <span class="cm"> */</span> |
| <span class="kd">protected</span> <span class="kt">void</span> <span class="nf">onConfigure</span><span class="o">()</span> <span class="o">{}</span> |
| <span class="o">}</span></code></pre></div> |
| |
| <ul> |
| <li><a href="http://svn.apache.org/repos/asf/wicket/releases/wicket-1.4.10/">Subversion tag</a> </li> |
| <li><a href="https://issues.apache.org/jira/secure/IssueNavigator.jspa?reset=true&mode=hide&sorter/order=DESC&sorter/field=priority&pid=12310561&fixfor=12315070">Changelog</a></li> |
| <li>To use in Maven: </li> |
| </ul> |
| |
| <div class="highlight"><pre><code class="language-xml" data-lang="xml"><span class="nt"><dependency></span> |
| <span class="nt"><groupId></span>org.apache.wicket<span class="nt"></groupId></span> |
| <span class="nt"><artifactId></span>wicket<span class="nt"></artifactId></span> |
| <span class="nt"><version></span>1.4.10<span class="nt"></version></span> |
| <span class="nt"></dependency></span></code></pre></div> |
| |
| <ul> |
| <li>Download the <a href="http://www.apache.org/dyn/closer.cgi/wicket/1.4.10">full |
| distribution</a> (including |
| source)</li> |
| </ul> |
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