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<td >Qt 5.9</td><td ><a href="qtcore-index.html">Qt Core</a></td><td ><a href="qtcore-module.html">C++ Classes</a></td><td >QSignalBlocker</td></tr></table><table class="buildversion"><tr>
<td id="buildversion" width="100%" align="right">Qt 5.9.4 Reference Documentation</td>
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<h3><a name="toc">Contents</a></h3>
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<li class="level1"><a href="#public-functions">Public Functions</a></li>
<li class="level1"><a href="#details">Detailed Description</a></li>
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<h1 class="title">QSignalBlocker Class</h1>
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<p>Exception-safe wrapper around <a href="qobject.html#blockSignals">QObject::blockSignals</a>() <a href="#details">More...</a></p>
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<div class="table"><table class="alignedsummary">
<tr><td class="memItemLeft rightAlign topAlign"> Header:</td><td class="memItemRight bottomAlign">   <span class="preprocessor">#include &lt;QSignalBlocker&gt;</span>
</td></tr><tr><td class="memItemLeft rightAlign topAlign"> qmake:</td><td class="memItemRight bottomAlign"> QT += core</td></tr><tr><td class="memItemLeft rightAlign topAlign"> Since:</td><td class="memItemRight bottomAlign">  Qt 5.3</td></tr></table></div><ul>
<li><a href="qsignalblocker-members.html">List of all members, including inherited members</a></li>
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<p><b>Note:</b> All functions in this class are reentrant.</p>
<a name="public-functions"></a>
<h2 id="public-functions">Public Functions</h2>
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<tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="qsignalblocker.html#QSignalBlocker">QSignalBlocker</a></b>(QObject *<i>object</i>)</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="qsignalblocker.html#QSignalBlocker-1">QSignalBlocker</a></b>(QObject &amp;<i>object</i>)</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="qsignalblocker.html#QSignalBlocker-2">QSignalBlocker</a></b>(QSignalBlocker &amp;&amp;<i>other</i>)</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="qsignalblocker.html#dtor.QSignalBlocker">~QSignalBlocker</a></b>()</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> void </td><td class="memItemRight bottomAlign"><b><a href="qsignalblocker.html#reblock">reblock</a></b>()</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> void </td><td class="memItemRight bottomAlign"><b><a href="qsignalblocker.html#unblock">unblock</a></b>()</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> QSignalBlocker &amp;</td><td class="memItemRight bottomAlign"><b><a href="qsignalblocker.html#operator-eq">operator=</a></b>(QSignalBlocker &amp;&amp;<i>other</i>)</td></tr>
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<a name="details"></a>
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<h2 id="details">Detailed Description</h2>
<p>Exception-safe wrapper around <a href="qobject.html#blockSignals">QObject::blockSignals</a>()</p>
<p><a href="qsignalblocker.html">QSignalBlocker</a> can be used whereever you would otherwise use a pair of calls to blockSignals(). It blocks signals in its constructor and in the destructor it resets the state to what it was before the constructor ran.</p>
<pre class="cpp">

  {
  <span class="keyword">const</span> <span class="type"><a href="qsignalblocker.html#QSignalBlocker">QSignalBlocker</a></span> blocker(someQObject);
  <span class="comment">// no signals here</span>
  }

</pre>
<p>is thus equivalent to</p>
<pre class="cpp">

  <span class="keyword">const</span> bool wasBlocked <span class="operator">=</span> someQObject<span class="operator">-</span><span class="operator">&gt;</span>blockSignals(<span class="keyword">true</span>);
  <span class="comment">// no signals here</span>
  someQObject<span class="operator">-</span><span class="operator">&gt;</span>blockSignals(wasBlocked);

</pre>
<p>except the code using <a href="qsignalblocker.html">QSignalBlocker</a> is safe in the face of exceptions.</p>
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<p><b>See also </b><a href="qmutexlocker.html">QMutexLocker</a> and <a href="qeventlooplocker.html">QEventLoopLocker</a>.</p>
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<h2>Member Function Documentation</h2>
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<h3 class="fn" id="QSignalBlocker"><a name="QSignalBlocker"></a>QSignalBlocker::<span class="name">QSignalBlocker</span>(<span class="type"><a href="qobject.html">QObject</a></span> *<i>object</i>)</h3>
<p>Constructor. Calls <i>object</i>-&gt;blockSignals(true).</p>
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<h3 class="fn" id="QSignalBlocker-1"><a name="QSignalBlocker-1"></a>QSignalBlocker::<span class="name">QSignalBlocker</span>(<span class="type"><a href="qobject.html">QObject</a></span> &amp;<i>object</i>)</h3>
<p>This is an overloaded function.</p>
<p>Calls <i>object</i>.blockSignals(true).</p>
<!-- @@@QSignalBlocker -->
<!-- $$$QSignalBlocker$$$QSignalBlockerQSignalBlocker&& -->
<h3 class="fn" id="QSignalBlocker-2"><a name="QSignalBlocker-2"></a>QSignalBlocker::<span class="name">QSignalBlocker</span>(<span class="type"><a href="qsignalblocker.html#QSignalBlocker">QSignalBlocker</a></span> &amp;&amp;<i>other</i>)</h3>
<p>Move-constructs a signal blocker from <i>other</i>. <i>other</i> will have a no-op destructor, while repsonsibility for restoring the <a href="qobject.html#signalsBlocked">QObject::signalsBlocked</a>() state is transferred to the new object.</p>
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<h3 class="fn" id="dtor.QSignalBlocker"><a name="dtor.QSignalBlocker"></a>QSignalBlocker::<span class="name">~QSignalBlocker</span>()</h3>
<p>Destructor. Restores the <a href="qobject.html#signalsBlocked">QObject::signalsBlocked</a>() state to what it was before the constructor ran, unless <a href="qsignalblocker.html#unblock">unblock</a>() has been called without a following <a href="qsignalblocker.html#reblock">reblock</a>(), in which case it does nothing.</p>
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<h3 class="fn" id="reblock"><a name="reblock"></a><span class="type">void</span> QSignalBlocker::<span class="name">reblock</span>()</h3>
<p>Re-blocks signals after a previous <a href="qsignalblocker.html#unblock">unblock</a>().</p>
<p>The numbers of reblock() and <a href="qsignalblocker.html#unblock">unblock</a>() calls are not counted, so every reblock() undoes any number of <a href="qsignalblocker.html#unblock">unblock</a>() calls.</p>
<!-- @@@reblock -->
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<h3 class="fn" id="unblock"><a name="unblock"></a><span class="type">void</span> QSignalBlocker::<span class="name">unblock</span>()</h3>
<p>Temporarily restores the <a href="qobject.html#signalsBlocked">QObject::signalsBlocked</a>() state to what it was before this QSignaBlocker's constructor ran. To undo, use <a href="qsignalblocker.html#reblock">reblock</a>().</p>
<p>The numbers of <a href="qsignalblocker.html#reblock">reblock</a>() and unblock() calls are not counted, so every unblock() undoes any number of <a href="qsignalblocker.html#reblock">reblock</a>() calls.</p>
<!-- @@@unblock -->
<!-- $$$operator=[overload1]$$$operator=QSignalBlocker&& -->
<h3 class="fn" id="operator-eq"><a name="operator-eq"></a><span class="type"><a href="qsignalblocker.html#QSignalBlocker">QSignalBlocker</a></span> &amp;QSignalBlocker::<span class="name">operator=</span>(<span class="type"><a href="qsignalblocker.html#QSignalBlocker">QSignalBlocker</a></span> &amp;&amp;<i>other</i>)</h3>
<p>Move-assigns this signal blocker from <i>other</i>. <i>other</i> will have a no-op destructor, while repsonsibility for restoring the <a href="qobject.html#signalsBlocked">QObject::signalsBlocked</a>() state is transferred to this object.</p>
<p>The object's signals this signal blocker was blocking prior to being moved to, if any, are unblocked <i>except</i> in the case where both instances block the same object's signals and <code>*this</code> is unblocked while <i>other</i> is not, at the time of the move.</p>
<!-- @@@operator= -->
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