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Paul O’Shannessy
668 lines
42 KiB
HTML
668 lines
42 KiB
HTML
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<h3>Flux</h3>
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<a href="https://facebook.github.io/flux/docs/todo-list.html" class="external">Flux TodoMVC Tutorial</a>
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<h3>Tips</h3>
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<a href="/react/tips/introduction.html">Introduction</a>
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<a href="/react/tips/maximum-number-of-jsx-root-nodes.html">Maximum Number of JSX Root Nodes</a>
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<a href="/react/tips/style-props-value-px.html">Shorthand for Specifying Pixel Values in style props</a>
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<a href="/react/tips/children-props-type.html">Type of the Children props</a>
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<a href="/react/tips/controlled-input-null-value.html">Value of null for Controlled Input</a>
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<a href="/react/tips/componentWillReceiveProps-not-triggered-after-mounting.html">componentWillReceiveProps Not Triggered After Mounting</a>
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<a href="/react/tips/props-in-getInitialState-as-anti-pattern.html">Props in getInitialState Is an Anti-Pattern</a>
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<li>
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<a href="/react/tips/dom-event-listeners.html">DOM Event Listeners in a Component</a>
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<li>
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<a href="/react/tips/initial-ajax.html">Load Initial Data via AJAX</a>
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<li>
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<a href="/react/tips/false-in-jsx.html">False in JSX</a>
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<a href="/react/tips/communicate-between-components.html">Communicate Between Components</a>
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<li>
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<a href="/react/tips/expose-component-functions.html">Expose Component Functions</a>
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<li>
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<a href="/react/tips/children-undefined.html">this.props.children undefined</a>
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</li>
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<li>
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<a href="/react/tips/use-react-with-other-libraries.html">Use React with Other Libraries</a>
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</li>
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<li>
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<a href="/react/tips/dangerously-set-inner-html.html">Dangerously Set innerHTML</a>
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</li>
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</ul>
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</div>
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</div>
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<div class="inner-content">
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<h1>
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Animazioni
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<a class="edit-page-link" href="https://github.com/facebook/react/tree/master/docs/docs/10.1-animation.it-IT.md" target="_blank">Edit on GitHub</a>
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</h1>
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<div class="subHeader"></div>
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<p>React offre un componente addon <code>ReactTransitionGroup</code> come una API di basso livello per le animazioni, e un <code>ReactCSSTransitionGroup</code> per implementare facilmente animazioni e transizioni CSS di base.</p>
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<h2><a class="anchor" name="api-di-alto-livello-reactcsstransitiongroup"></a>API di Alto Livello: <code>ReactCSSTransitionGroup</code> <a class="hash-link" href="#api-di-alto-livello-reactcsstransitiongroup">#</a></h2>
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<p><code>ReactCSSTransitionGroup</code> è basato su <code>ReactTransitionGroup</code> ed è una maniera semplice di effettuare transizioni e animazioni CSS quando un componente React viene aggiunto o rimosso dal DOM. È ispirato all'eccellente libreria <a href="http://www.nganimate.org/">ng-animate</a>.</p>
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<h3><a class="anchor" name="per-cominciare"></a>Per Cominciare <a class="hash-link" href="#per-cominciare">#</a></h3>
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<p><code>ReactCSSTransitionGroup</code> è l'interfaccia a <code>ReactTransitions</code>. Questo è un semplice elemento che racchiude tutti i componenti che desideri animare. Ecco un esempio in cui facciamo apparire e scomparire gli elementi di una lista.</p>
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<div class="highlight"><pre><code class="language-javascript" data-lang="javascript"><span class="kd">var</span> <span class="nx">ReactCSSTransitionGroup</span> <span class="o">=</span> <span class="nx">React</span><span class="p">.</span><span class="nx">addons</span><span class="p">.</span><span class="nx">CSSTransitionGroup</span><span class="p">;</span>
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<span class="kd">var</span> <span class="nx">TodoList</span> <span class="o">=</span> <span class="nx">React</span><span class="p">.</span><span class="nx">createClass</span><span class="p">({</span>
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<span class="nx">getInitialState</span><span class="o">:</span> <span class="kd">function</span><span class="p">()</span> <span class="p">{</span>
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<span class="k">return</span> <span class="p">{</span><span class="nx">items</span><span class="o">:</span> <span class="p">[</span><span class="s1">'ciao'</span><span class="p">,</span> <span class="s1">'mondo'</span><span class="p">,</span> <span class="s1">'clicca'</span><span class="p">,</span> <span class="s1">'qui'</span><span class="p">]};</span>
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<span class="p">},</span>
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<span class="nx">handleAdd</span><span class="o">:</span> <span class="kd">function</span><span class="p">()</span> <span class="p">{</span>
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<span class="kd">var</span> <span class="nx">newItems</span> <span class="o">=</span>
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<span class="k">this</span><span class="p">.</span><span class="nx">state</span><span class="p">.</span><span class="nx">items</span><span class="p">.</span><span class="nx">concat</span><span class="p">([</span><span class="nx">prompt</span><span class="p">(</span><span class="s1">'Scrivi del testo'</span><span class="p">)]);</span>
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<span class="k">this</span><span class="p">.</span><span class="nx">setState</span><span class="p">({</span><span class="nx">items</span><span class="o">:</span> <span class="nx">newItems</span><span class="p">});</span>
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<span class="p">},</span>
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<span class="nx">handleRemove</span><span class="o">:</span> <span class="kd">function</span><span class="p">(</span><span class="nx">i</span><span class="p">)</span> <span class="p">{</span>
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<span class="kd">var</span> <span class="nx">newItems</span> <span class="o">=</span> <span class="k">this</span><span class="p">.</span><span class="nx">state</span><span class="p">.</span><span class="nx">items</span><span class="p">;</span>
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<span class="nx">newItems</span><span class="p">.</span><span class="nx">splice</span><span class="p">(</span><span class="nx">i</span><span class="p">,</span> <span class="mi">1</span><span class="p">);</span>
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<span class="k">this</span><span class="p">.</span><span class="nx">setState</span><span class="p">({</span><span class="nx">items</span><span class="o">:</span> <span class="nx">newItems</span><span class="p">});</span>
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<span class="p">},</span>
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<span class="nx">render</span><span class="o">:</span> <span class="kd">function</span><span class="p">()</span> <span class="p">{</span>
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<span class="kd">var</span> <span class="nx">items</span> <span class="o">=</span> <span class="k">this</span><span class="p">.</span><span class="nx">state</span><span class="p">.</span><span class="nx">items</span><span class="p">.</span><span class="nx">map</span><span class="p">(</span><span class="kd">function</span><span class="p">(</span><span class="nx">item</span><span class="p">,</span> <span class="nx">i</span><span class="p">)</span> <span class="p">{</span>
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<span class="k">return</span> <span class="p">(</span>
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<span class="o"><</span><span class="nx">div</span> <span class="nx">key</span><span class="o">=</span><span class="p">{</span><span class="nx">item</span><span class="p">}</span> <span class="nx">onClick</span><span class="o">=</span><span class="p">{</span><span class="k">this</span><span class="p">.</span><span class="nx">handleRemove</span><span class="p">.</span><span class="nx">bind</span><span class="p">(</span><span class="k">this</span><span class="p">,</span> <span class="nx">i</span><span class="p">)}</span><span class="o">></span>
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<span class="p">{</span><span class="nx">item</span><span class="p">}</span>
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<span class="o"><</span><span class="err">/div></span>
|
|
<span class="p">);</span>
|
|
<span class="p">}.</span><span class="nx">bind</span><span class="p">(</span><span class="k">this</span><span class="p">));</span>
|
|
<span class="k">return</span> <span class="p">(</span>
|
|
<span class="o"><</span><span class="nx">div</span><span class="o">></span>
|
|
<span class="o"><</span><span class="nx">button</span> <span class="nx">onClick</span><span class="o">=</span><span class="p">{</span><span class="k">this</span><span class="p">.</span><span class="nx">handleAdd</span><span class="p">}</span><span class="o">></span><span class="nx">Aggiungi</span> <span class="nx">Elemento</span><span class="o"><</span><span class="err">/button></span>
|
|
<span class="hll"> <span class="o"><</span><span class="nx">ReactCSSTransitionGroup</span> <span class="nx">transitionName</span><span class="o">=</span><span class="s2">"example"</span> <span class="nx">transitionEnterTimeout</span><span class="o">=</span><span class="p">{</span><span class="mi">500</span><span class="p">}</span> <span class="nx">transitionLeaveTimeout</span><span class="o">=</span><span class="p">{</span><span class="mi">300</span><span class="p">}</span><span class="o">></span>
|
|
</span><span class="hll"> <span class="p">{</span><span class="nx">items</span><span class="p">}</span>
|
|
</span><span class="hll"> <span class="o"><</span><span class="err">/ReactCSSTransitionGroup></span>
|
|
</span> <span class="o"><</span><span class="err">/div></span>
|
|
<span class="p">);</span>
|
|
<span class="p">}</span>
|
|
<span class="p">});</span>
|
|
</code></pre></div>
|
|
<blockquote>
|
|
<p>Nota:</p>
|
|
|
|
<p>Devi fornire <a href="/react/docs/multiple-components.html#dynamic-children">l'attributo <code>key</code></a> per tutti i figli di <code>ReactCSSTransitionGroup</code>, anche quando stai visualizzando un singolo elemento. Questo è il modo in cui React determina quali figli sono stati aggiunti, rimossi, o sono rimasti.</p>
|
|
</blockquote>
|
|
|
|
<p>In questo componente, quando un nuovo elemento viene aggiunto a <code>ReactCSSTransitionGroup</code> riceverà la classe CSS <code>example-enter</code> e la classe CSS <code>example-enter-active</code> allo scatto successivo. Questa è una convenzione basata sul valore della proprietà <code>transitionName</code>.</p>
|
|
|
|
<p>Puoi usare queste classi per scatenare una animazione o transizione CSS. Ad esempio, prova ad aggiungere questo CSS e aggiungere un nuovo elemento alla lista:</p>
|
|
<div class="highlight"><pre><code class="language-css" data-lang="css"><span class="nc">.example-enter</span> <span class="p">{</span>
|
|
<span class="k">opacity</span><span class="o">:</span> <span class="m">0</span><span class="o">.</span><span class="m">01</span><span class="p">;</span>
|
|
<span class="p">}</span>
|
|
|
|
<span class="nc">.example-enter.example-enter-active</span> <span class="p">{</span>
|
|
<span class="k">opacity</span><span class="o">:</span> <span class="m">1</span><span class="p">;</span>
|
|
<span class="n">transition</span><span class="o">:</span> <span class="k">opacity</span> <span class="m">500</span><span class="n">ms</span> <span class="n">ease</span><span class="o">-</span><span class="n">in</span><span class="p">;</span>
|
|
<span class="p">}</span>
|
|
|
|
<span class="nc">.example-leave</span> <span class="p">{</span>
|
|
<span class="k">opacity</span><span class="o">:</span> <span class="m">1</span><span class="p">;</span>
|
|
<span class="p">}</span>
|
|
|
|
<span class="nc">.example-leave.example-leave-active</span> <span class="p">{</span>
|
|
<span class="k">opacity</span><span class="o">:</span> <span class="m">0</span><span class="o">.</span><span class="m">01</span><span class="p">;</span>
|
|
<span class="n">transition</span><span class="o">:</span> <span class="k">opacity</span> <span class="m">300</span><span class="n">ms</span> <span class="n">ease</span><span class="o">-</span><span class="n">in</span><span class="p">;</span>
|
|
<span class="p">}</span>
|
|
</code></pre></div>
|
|
<p>Ti accorgerai che la durata delle animazioni devono essere specificate sia nel CSS che nel metodo render; questo suggerisce a React quando rimuovere le classi di animazione dall'elemento e -- se sta venendo rimosso -- quando rimuovere l'elemento dal DOM.</p>
|
|
<h3><a class="anchor" name="animare-il-montaggio-iniziale"></a>Animare il Montaggio Iniziale <a class="hash-link" href="#animare-il-montaggio-iniziale">#</a></h3>
|
|
<p><code>ReactCSSTransitionGroup</code> fornisce la proprietà opzionale <code>transitionAppear</code>, per aggiungere una fase aggiuntiva di transizione al montaggio iniziale del componente. In genere non c'è alcuna fase di transizione al montaggio iniziale in quanto il valore predefinito di <code>transitionAppear</code> è <code>false</code>. L'esempio seguente passa la proprietà <code>transitionAppear</code> con il valore <code>true</code>.</p>
|
|
<div class="highlight"><pre><code class="language-javascript" data-lang="javascript"> <span class="nx">render</span><span class="o">:</span> <span class="kd">function</span><span class="p">()</span> <span class="p">{</span>
|
|
<span class="k">return</span> <span class="p">(</span>
|
|
<span class="hll"> <span class="o"><</span><span class="nx">ReactCSSTransitionGroup</span> <span class="nx">transitionName</span><span class="o">=</span><span class="s2">"example"</span> <span class="nx">transitionAppear</span><span class="o">=</span><span class="p">{</span><span class="kc">true</span><span class="p">}</span> <span class="nx">transitionAppearTimeout</span><span class="o">=</span><span class="p">{</span><span class="mi">500</span><span class="p">}</span><span class="o">></span>
|
|
</span><span class="hll"> <span class="o"><</span><span class="nx">h1</span><span class="o">></span><span class="nx">Dissolvenza</span> <span class="nx">al</span> <span class="nx">Montaggio</span> <span class="nx">Iniziale</span><span class="o"><</span><span class="err">/h1></span>
|
|
</span><span class="hll"> <span class="o"><</span><span class="err">/ReactCSSTransitionGroup></span>
|
|
</span> <span class="p">);</span>
|
|
<span class="p">}</span>
|
|
</code></pre></div>
|
|
<p>Durante il montaggio iniziale <code>ReactCSSTransitionGroup</code> otterrà la classe CSS <code>example-appear</code> e la classe CSS <code>example-appear-active</code> allo scatto successivo.</p>
|
|
<div class="highlight"><pre><code class="language-css" data-lang="css"><span class="nc">.example-appear</span> <span class="p">{</span>
|
|
<span class="k">opacity</span><span class="o">:</span> <span class="m">0</span><span class="o">.</span><span class="m">01</span><span class="p">;</span>
|
|
<span class="p">}</span>
|
|
|
|
<span class="nc">.example-appear.example-appear-active</span> <span class="p">{</span>
|
|
<span class="k">opacity</span><span class="o">:</span> <span class="m">1</span><span class="p">;</span>
|
|
<span class="n">transition</span><span class="o">:</span> <span class="k">opacity</span> <span class="m">.5s</span> <span class="n">ease</span><span class="o">-</span><span class="n">in</span><span class="p">;</span>
|
|
<span class="p">}</span>
|
|
</code></pre></div>
|
|
<p>Al montaggio iniziale, tutti i figli di <code>ReactCSSTransitionGroup</code> saranno marcati come <code>appear</code> ma non <code>enter</code>. Tuttavia, tutti i figli aggiunti in seguito ad un <code>ReactCSSTransitionGroup</code> esistente saranno marcati come <code>enter</code> ma non <code>appear</code>.</p>
|
|
|
|
<blockquote>
|
|
<p>Nota:</p>
|
|
|
|
<p>La proprietà <code>transitionAppear</code> è stata aggiunta a <code>ReactCSSTransitionGroup</code> nella versione <code>0.13</code>. Per mantenere la compatibilità con le versioni precedenti, il valore predefinito è impostato a <code>false</code>.</p>
|
|
</blockquote>
|
|
<h3><a class="anchor" name="classi-personalizzate"></a>Classi Personalizzate <a class="hash-link" href="#classi-personalizzate">#</a></h3>
|
|
<p>È anche possibile usare nomi di classi personalizzate per ciascuna delle fasi delle tue transizioni. Anziché passare una stringa come valore di <code>transitionName</code> puoi assegnare un oggetto che contiene i nomi delle classi <code>enter</code> o <code>leave</code>, oppure un oggetto contenente i nomi delle classi per <code>enter</code>, <code>enter-active</code>, <code>leave-active</code>e <code>leave</code>. Se vengono forniti soltanto i nomi delle classi enter e leave, le classi per enter-active e leave-active saranno determinate aggiungendo il suffisso '-active' ai rispettivi nomi delle classi. Ecco due esempi che usano le classi personalizzate:</p>
|
|
<div class="highlight"><pre><code class="language-javascript" data-lang="javascript"> <span class="p">...</span>
|
|
<span class="o"><</span><span class="nx">ReactCSSTransitionGroup</span>
|
|
<span class="nx">transitionName</span><span class="o">=</span><span class="p">{</span> <span class="p">{</span>
|
|
<span class="nx">enter</span><span class="o">:</span> <span class="s1">'enter'</span><span class="p">,</span>
|
|
<span class="nx">enterActive</span><span class="o">:</span> <span class="s1">'enterActive'</span><span class="p">,</span>
|
|
<span class="nx">leave</span><span class="o">:</span> <span class="s1">'leave'</span><span class="p">,</span>
|
|
<span class="nx">leaveActive</span><span class="o">:</span> <span class="s1">'leaveActive'</span><span class="p">,</span>
|
|
<span class="nx">appear</span><span class="o">:</span> <span class="s1">'appear'</span><span class="p">,</span>
|
|
<span class="nx">appearActive</span><span class="o">:</span> <span class="s1">'appearActive'</span>
|
|
<span class="p">}</span> <span class="p">}</span><span class="o">></span>
|
|
<span class="p">{</span><span class="nx">item</span><span class="p">}</span>
|
|
<span class="o"><</span><span class="err">/ReactCSSTransitionGroup></span>
|
|
|
|
<span class="o"><</span><span class="nx">ReactCSSTransitionGroup</span>
|
|
<span class="nx">transitionName</span><span class="o">=</span><span class="p">{</span> <span class="p">{</span>
|
|
<span class="nx">enter</span><span class="o">:</span> <span class="s1">'enter'</span><span class="p">,</span>
|
|
<span class="nx">leave</span><span class="o">:</span> <span class="s1">'leave'</span><span class="p">,</span>
|
|
<span class="nx">appear</span><span class="o">:</span> <span class="s1">'appear'</span>
|
|
<span class="p">}</span> <span class="p">}</span><span class="o">></span>
|
|
<span class="p">{</span><span class="nx">item2</span><span class="p">}</span>
|
|
<span class="o"><</span><span class="err">/ReactCSSTransitionGroup></span>
|
|
<span class="p">...</span>
|
|
</code></pre></div><h3><a class="anchor" name="i-gruppi-di-animazioni-devono-essere-montati-per-funzionare"></a>I Gruppi di Animazioni Devono Essere Montati per Funzionare <a class="hash-link" href="#i-gruppi-di-animazioni-devono-essere-montati-per-funzionare">#</a></h3>
|
|
<p>Per applicare le transizioni ai suoi figli, il <code>ReactCSSTransitionGroup</code> deve già essere montato nel DOM oppure la proprietà <code>transitionAppear</code> deve essere impostata a <code>true</code>. L'esempio seguente non funziona, poiché <code>ReactCSSTransitionGroup</code> sta venendo montato assieme al nuovo elemento, anziché il nuovo elemento venire montato dentro di esso. Confronta questo esempio con la sezione precedente <a href="#getting-started">Per Cominciare</a> per notare la differenza.</p>
|
|
<div class="highlight"><pre><code class="language-javascript" data-lang="javascript"> <span class="nx">render</span><span class="o">:</span> <span class="kd">function</span><span class="p">()</span> <span class="p">{</span>
|
|
<span class="kd">var</span> <span class="nx">items</span> <span class="o">=</span> <span class="k">this</span><span class="p">.</span><span class="nx">state</span><span class="p">.</span><span class="nx">items</span><span class="p">.</span><span class="nx">map</span><span class="p">(</span><span class="kd">function</span><span class="p">(</span><span class="nx">item</span><span class="p">,</span> <span class="nx">i</span><span class="p">)</span> <span class="p">{</span>
|
|
<span class="k">return</span> <span class="p">(</span>
|
|
<span class="o"><</span><span class="nx">div</span> <span class="nx">key</span><span class="o">=</span><span class="p">{</span><span class="nx">item</span><span class="p">}</span> <span class="nx">onClick</span><span class="o">=</span><span class="p">{</span><span class="k">this</span><span class="p">.</span><span class="nx">handleRemove</span><span class="p">.</span><span class="nx">bind</span><span class="p">(</span><span class="k">this</span><span class="p">,</span> <span class="nx">i</span><span class="p">)}</span><span class="o">></span>
|
|
<span class="o"><</span><span class="nx">ReactCSSTransitionGroup</span> <span class="nx">transitionName</span><span class="o">=</span><span class="s2">"example"</span><span class="o">></span>
|
|
<span class="p">{</span><span class="nx">item</span><span class="p">}</span>
|
|
<span class="o"><</span><span class="err">/ReactCSSTransitionGroup></span>
|
|
<span class="o"><</span><span class="err">/div></span>
|
|
<span class="p">);</span>
|
|
<span class="p">},</span> <span class="k">this</span><span class="p">);</span>
|
|
<span class="k">return</span> <span class="p">(</span>
|
|
<span class="hll"> <span class="o"><</span><span class="nx">div</span><span class="o">></span>
|
|
</span><span class="hll"> <span class="o"><</span><span class="nx">button</span> <span class="nx">onClick</span><span class="o">=</span><span class="p">{</span><span class="k">this</span><span class="p">.</span><span class="nx">handleAdd</span><span class="p">}</span><span class="o">></span><span class="nx">Aggiungi</span> <span class="nx">Elemento</span><span class="o"><</span><span class="err">/button></span>
|
|
</span><span class="hll"> <span class="p">{</span><span class="nx">items</span><span class="p">}</span>
|
|
</span><span class="hll"> <span class="o"><</span><span class="err">/div></span>
|
|
</span> <span class="p">);</span>
|
|
<span class="p">}</span>
|
|
</code></pre></div><h3><a class="anchor" name="animare-uno-o-nessun-elemento"></a>Animare Uno o Nessun Elemento <a class="hash-link" href="#animare-uno-o-nessun-elemento">#</a></h3>
|
|
<p>Nell'esempio precedente, abbiamo visualizzato una lista di elementi in <code>ReactCSSTransitionGroup</code>. Tuttavia, i figli di <code>ReactCSSTransitionGroup</code> possono anche essere un solo o nessun elemento. Questo rende possibile animare un singolo elemento che viene aggiunto o rimosso. Similarmente, puoi animare un nuovo elemento che sistituisce l'elemento corrente. Ad esempio, possiamo implementare un semplice carosello di immagini come segue:</p>
|
|
<div class="highlight"><pre><code class="language-javascript" data-lang="javascript"><span class="kd">var</span> <span class="nx">ReactCSSTransitionGroup</span> <span class="o">=</span> <span class="nx">React</span><span class="p">.</span><span class="nx">addons</span><span class="p">.</span><span class="nx">CSSTransitionGroup</span><span class="p">;</span>
|
|
|
|
<span class="kd">var</span> <span class="nx">ImageCarousel</span> <span class="o">=</span> <span class="nx">React</span><span class="p">.</span><span class="nx">createClass</span><span class="p">({</span>
|
|
<span class="nx">propTypes</span><span class="o">:</span> <span class="p">{</span>
|
|
<span class="nx">imageSrc</span><span class="o">:</span> <span class="nx">React</span><span class="p">.</span><span class="nx">PropTypes</span><span class="p">.</span><span class="nx">string</span><span class="p">.</span><span class="nx">isRequired</span>
|
|
<span class="p">},</span>
|
|
<span class="nx">render</span><span class="o">:</span> <span class="kd">function</span><span class="p">()</span> <span class="p">{</span>
|
|
<span class="k">return</span> <span class="p">(</span>
|
|
<span class="o"><</span><span class="nx">div</span><span class="o">></span>
|
|
<span class="hll"> <span class="o"><</span><span class="nx">ReactCSSTransitionGroup</span> <span class="nx">transitionName</span><span class="o">=</span><span class="s2">"carousel"</span> <span class="nx">transitionEnterTimeout</span><span class="o">=</span><span class="p">{</span><span class="mi">300</span><span class="p">}</span> <span class="nx">transitionLeaveTimeout</span><span class="o">=</span><span class="p">{</span><span class="mi">300</span><span class="p">}</span><span class="o">></span>
|
|
</span><span class="hll"> <span class="o"><</span><span class="nx">img</span> <span class="nx">src</span><span class="o">=</span><span class="p">{</span><span class="k">this</span><span class="p">.</span><span class="nx">props</span><span class="p">.</span><span class="nx">imageSrc</span><span class="p">}</span> <span class="nx">key</span><span class="o">=</span><span class="p">{</span><span class="k">this</span><span class="p">.</span><span class="nx">props</span><span class="p">.</span><span class="nx">imageSrc</span><span class="p">}</span> <span class="o">/></span>
|
|
</span><span class="hll"> <span class="o"><</span><span class="err">/ReactCSSTransitionGroup></span>
|
|
</span> <span class="o"><</span><span class="err">/div></span>
|
|
<span class="p">);</span>
|
|
<span class="p">}</span>
|
|
<span class="p">});</span>
|
|
</code></pre></div><h3><a class="anchor" name="disattivare-le-animazioni"></a>Disattivare le Animazioni <a class="hash-link" href="#disattivare-le-animazioni">#</a></h3>
|
|
<p>Se lo desideri, puoi disattivare le animazioni <code>enter</code> o <code>leave</code>. Ad esempio, a volte potresti volere un'animazione per <code>enter</code> ma non una per <code>leave</code>, ma <code>ReactCSSTransitionGroup</code> attende che l'animazione sia completata prima di rimuovere il tuo nodo DOM. Puoi aggiungere le proprietà <code>transitionEnter={false}</code> o <code>transitionLeave={false}</code> a <code>ReactCSSTransitionGroup</code> per disattivare le rispettive animazioni.</p>
|
|
|
|
<blockquote>
|
|
<p>Nota:</p>
|
|
|
|
<p>Quando si usa <code>ReactCSSTransitionGroup</code>, non c'è alcun modo per cui i tuoi componenti vengano avvisati quando la transizione è terminata o per effettuare una logica complessa durante l'animazione. Se vuoi un controllo più fine, puoi usare la API di basso livello <code>ReactTransitionGroup</code> che fornisce degli hook che puoi utilizzare per effettuare transizioni personalizzate.</p>
|
|
</blockquote>
|
|
<h2><a class="anchor" name="api-di-basso-livello-reacttransitiongroup"></a>API di Basso Livello: <code>ReactTransitionGroup</code> <a class="hash-link" href="#api-di-basso-livello-reacttransitiongroup">#</a></h2>
|
|
<p><code>ReactTransitionGroup</code> è la base per le animazioni. È accessibile come <code>React.addons.TransitionGroup</code>. Quando vi sono aggiunti o rimossi dichiarativamente dei figli (come negli esempi precedenti) degli speciali hook del ciclo di vita sono invocati su di essi.</p>
|
|
<h3><a class="anchor" name="componentwillappearcallback"></a><code>componentWillAppear(callback)</code> <a class="hash-link" href="#componentwillappearcallback">#</a></h3>
|
|
<p>Viene chiamato allo stesso momento di <code>componentDidMount()</code> per i componenti inizialmente montati in un <code>TransitionGroup</code>. Bloccherà l'esecuzione di altre animazioni finché <code>callback</code> non viene chiamata. Viene chiamata solo durante il rendering iniziale di un <code>TransitionGroup</code>.</p>
|
|
<h3><a class="anchor" name="componentdidappear"></a><code>componentDidAppear()</code> <a class="hash-link" href="#componentdidappear">#</a></h3>
|
|
<p>Viene chiamato dopo che la funzione <code>callback</code> passata a <code>componentWillAppear</code> è stata chiamata.</p>
|
|
<h3><a class="anchor" name="componentwillentercallback"></a><code>componentWillEnter(callback)</code> <a class="hash-link" href="#componentwillentercallback">#</a></h3>
|
|
<p>Viene chiamato allo stesso momento di <code>componentDidMount()</code> per i componenti aggiunti ad un <code>TransitionGroup</code> esistente. Bloccherà l'esecuzione di altre animazioni finché <code>callback</code> non viene chiamata. Non viene chiamata durante il rendering iniziale di un <code>TransitionGroup</code>.</p>
|
|
<h3><a class="anchor" name="componentdidenter"></a><code>componentDidEnter()</code> <a class="hash-link" href="#componentdidenter">#</a></h3>
|
|
<p>Viene chiamato dopo che la funzione <code>callback</code> passata a <code>componentWillEnter</code> è stata chiamata.</p>
|
|
<h3><a class="anchor" name="componentwillleavecallback"></a><code>componentWillLeave(callback)</code> <a class="hash-link" href="#componentwillleavecallback">#</a></h3>
|
|
<p>Viene chiamato quando il figlio è stato rimosso dal <code>ReactTransitionGroup</code>. Nonostante il figlio sia stato rimosso, <code>ReactTransitionGroup</code> lo manterrà nel DOM finché <code>callback</code> non viene chiamata.</p>
|
|
<h3><a class="anchor" name="componentdidleave"></a><code>componentDidLeave()</code> <a class="hash-link" href="#componentdidleave">#</a></h3>
|
|
<p>Viene chiamato quando la <code>callback</code> <code>willLeave</code> viene chiamata (contemporaneamente a <code>componentWillUnmount</code>).</p>
|
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<h3><a class="anchor" name="rendering-di-un-componente-diverso"></a>Rendering di un Componente Diverso <a class="hash-link" href="#rendering-di-un-componente-diverso">#</a></h3>
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<p>In maniera predefinita, <code>ReactTransitionGroup</code> viene visualizzato come uno <code>span</code>. Puoi cambiare questo comportamento fornento una proprietà <code>component</code>. Ad esempio, ecco come puoi visualizzare un <code><ul></code>:</p>
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<div class="highlight"><pre><code class="language-javascript" data-lang="javascript"><span class="hll"><span class="o"><</span><span class="nx">ReactTransitionGroup</span> <span class="nx">component</span><span class="o">=</span><span class="s2">"ul"</span><span class="o">></span>
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</span> <span class="p">...</span>
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<span class="o"><</span><span class="err">/ReactTransitionGroup></span>
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</code></pre></div>
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<p>È possibile utilizzare ciascun componente DOM che React può visualizzare. Tuttavia, <code>component</code> non deve necessariamente essere un componente DOM. Può infatti essere qualunque componente React; anche componenti scritti da te!</p>
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<blockquote>
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<p>Nota:</p>
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<p>Prima della v0.12, quando venivano usati componenti DOM, la proprietà <code>component</code> doveva essere un riferimento a <code>React.DOM.*</code>. Dal momento che il componente è semplicemente passato a <code>React.createElement</code>, deve ora essere una stringa. Per componenti compositi si deve passare il metodo factory.</p>
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</blockquote>
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<p>Ciascuna proprietà aggiuntiva definita dall'utente diverrà una proprietà del componente visualizzato. Ad esempio, ecco come visualizzeresti un <code><ul></code> con una classe CSS:</p>
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<div class="highlight"><pre><code class="language-javascript" data-lang="javascript"><span class="hll"><span class="o"><</span><span class="nx">ReactTransitionGroup</span> <span class="nx">component</span><span class="o">=</span><span class="s2">"ul"</span> <span class="nx">className</span><span class="o">=</span><span class="s2">"animated-list"</span><span class="o">></span>
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</span> <span class="p">...</span>
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<span class="o"><</span><span class="err">/ReactTransitionGroup></span>
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</code></pre></div>
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