347 lines
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347 lines
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<h1 class="title">QScriptValueIterator Class Reference</h1>
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<!-- $$$QScriptValueIterator-brief -->
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<p>The QScriptValueIterator class provides a Java-style iterator for <a href="qscriptvalue.html">QScriptValue</a>. <a href="#details">More...</a></p>
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<!-- @@@QScriptValueIterator -->
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<pre class="cpp"> <span class="preprocessor">#include <QScriptValueIterator></span></pre><p>This class was introduced in Qt 4.3.</p>
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<ul>
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<li><a href="qscriptvalueiterator-members.html">List of all members, including inherited members</a></li>
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</ul>
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<a name="public-functions"></a>
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<h2>Public Functions</h2>
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<table class="alignedsummary">
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<tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="qscriptvalueiterator.html#QScriptValueIterator">QScriptValueIterator</a></b> ( const QScriptValue & <i>object</i> )</td></tr>
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<tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="qscriptvalueiterator.html#dtor.QScriptValueIterator">~QScriptValueIterator</a></b> ()</td></tr>
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<tr><td class="memItemLeft rightAlign topAlign"> QScriptValue::PropertyFlags </td><td class="memItemRight bottomAlign"><b><a href="qscriptvalueiterator.html#flags">flags</a></b> () const</td></tr>
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<tr><td class="memItemLeft rightAlign topAlign"> bool </td><td class="memItemRight bottomAlign"><b><a href="qscriptvalueiterator.html#hasNext">hasNext</a></b> () const</td></tr>
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<tr><td class="memItemLeft rightAlign topAlign"> bool </td><td class="memItemRight bottomAlign"><b><a href="qscriptvalueiterator.html#hasPrevious">hasPrevious</a></b> () const</td></tr>
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<tr><td class="memItemLeft rightAlign topAlign"> QString </td><td class="memItemRight bottomAlign"><b><a href="qscriptvalueiterator.html#name">name</a></b> () const</td></tr>
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<tr><td class="memItemLeft rightAlign topAlign"> void </td><td class="memItemRight bottomAlign"><b><a href="qscriptvalueiterator.html#next">next</a></b> ()</td></tr>
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<tr><td class="memItemLeft rightAlign topAlign"> void </td><td class="memItemRight bottomAlign"><b><a href="qscriptvalueiterator.html#previous">previous</a></b> ()</td></tr>
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<tr><td class="memItemLeft rightAlign topAlign"> void </td><td class="memItemRight bottomAlign"><b><a href="qscriptvalueiterator.html#remove">remove</a></b> ()</td></tr>
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<tr><td class="memItemLeft rightAlign topAlign"> QScriptString </td><td class="memItemRight bottomAlign"><b><a href="qscriptvalueiterator.html#scriptName">scriptName</a></b> () const</td></tr>
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<tr><td class="memItemLeft rightAlign topAlign"> void </td><td class="memItemRight bottomAlign"><b><a href="qscriptvalueiterator.html#setValue">setValue</a></b> ( const QScriptValue & <i>value</i> )</td></tr>
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<tr><td class="memItemLeft rightAlign topAlign"> void </td><td class="memItemRight bottomAlign"><b><a href="qscriptvalueiterator.html#toBack">toBack</a></b> ()</td></tr>
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<tr><td class="memItemLeft rightAlign topAlign"> void </td><td class="memItemRight bottomAlign"><b><a href="qscriptvalueiterator.html#toFront">toFront</a></b> ()</td></tr>
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<tr><td class="memItemLeft rightAlign topAlign"> QScriptValue </td><td class="memItemRight bottomAlign"><b><a href="qscriptvalueiterator.html#value">value</a></b> () const</td></tr>
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<tr><td class="memItemLeft rightAlign topAlign"> QScriptValueIterator & </td><td class="memItemRight bottomAlign"><b><a href="qscriptvalueiterator.html#operator-eq">operator=</a></b> ( QScriptValue & <i>object</i> )</td></tr>
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</table>
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<a name="details"></a>
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<!-- $$$QScriptValueIterator-description -->
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<div class="descr">
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<h2>Detailed Description</h2>
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<p>The QScriptValueIterator class provides a Java-style iterator for <a href="qscriptvalue.html">QScriptValue</a>.</p>
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<p>The QScriptValueIterator constructor takes a <a href="qscriptvalue.html">QScriptValue</a> as argument. After construction, the iterator is located at the very beginning of the sequence of properties. Here's how to iterate over all the properties of a <a href="qscriptvalue.html">QScriptValue</a>:</p>
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<pre class="cpp"> <span class="type"><a href="qscriptvalue.html">QScriptValue</a></span> object;
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<span class="operator">.</span><span class="operator">.</span><span class="operator">.</span>
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<span class="type">QScriptValueIterator</span> it(object);
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<span class="keyword">while</span> (it<span class="operator">.</span>hasNext()) {
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it<span class="operator">.</span>next();
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<a href="qtglobal.html#qDebug">qDebug</a>() <span class="operator"><</span><span class="operator"><</span> it<span class="operator">.</span>name() <span class="operator"><</span><span class="operator"><</span> <span class="string">": "</span> <span class="operator"><</span><span class="operator"><</span> it<span class="operator">.</span>value()<span class="operator">.</span>toString();
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}</pre>
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<p>The <a href="qscriptvalueiterator.html#next">next</a>() advances the iterator. The <a href="qscriptvalueiterator.html#name">name</a>(), <a href="qscriptvalueiterator.html#value">value</a>() and <a href="qscriptvalueiterator.html#flags">flags</a>() functions return the name, value and flags of the last item that was jumped over.</p>
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<p>If you want to remove properties as you iterate over the <a href="qscriptvalue.html">QScriptValue</a>, use <a href="qscriptvalueiterator.html#remove">remove</a>(). If you want to modify the value of a property, use <a href="qscriptvalueiterator.html#setValue">setValue</a>().</p>
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<p>Note that QScriptValueIterator only iterates over the <a href="qscriptvalue.html">QScriptValue</a>'s own properties; i.e. it does not follow the prototype chain. You can use a loop like this to follow the prototype chain:</p>
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<pre class="cpp"> <span class="type"><a href="qscriptvalue.html">QScriptValue</a></span> obj <span class="operator">=</span> <span class="operator">.</span><span class="operator">.</span><span class="operator">.</span>; <span class="comment">// the object to iterate over</span>
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<span class="keyword">while</span> (obj<span class="operator">.</span>isObject()) {
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<span class="type">QScriptValueIterator</span> it(obj);
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<span class="keyword">while</span> (it<span class="operator">.</span>hasNext()) {
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it<span class="operator">.</span>next();
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<a href="qtglobal.html#qDebug">qDebug</a>() <span class="operator"><</span><span class="operator"><</span> it<span class="operator">.</span>name();
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}
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obj <span class="operator">=</span> obj<span class="operator">.</span>prototype();
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}</pre>
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<p>Note that QScriptValueIterator will not automatically skip over properties that have the <a href="qscriptvalue.html#PropertyFlag-enum">QScriptValue::SkipInEnumeration</a> flag set; that flag only affects iteration in script code. If you want, you can skip over such properties with code like the following:</p>
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<pre class="cpp"> <span class="keyword">while</span> (it<span class="operator">.</span>hasNext()) {
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it<span class="operator">.</span>next();
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<span class="keyword">if</span> (it<span class="operator">.</span>flags() <span class="operator">&</span> <span class="type"><a href="qscriptvalue.html">QScriptValue</a></span><span class="operator">::</span>SkipInEnumeration)
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<span class="keyword">continue</span>;
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<a href="qtglobal.html#qDebug">qDebug</a>() <span class="operator"><</span><span class="operator"><</span> <span class="string">"found enumerated property:"</span> <span class="operator"><</span><span class="operator"><</span> it<span class="operator">.</span>name();
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}</pre>
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</div>
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<p><b>See also </b><a href="qscriptvalue.html#property">QScriptValue::property</a>().</p>
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<!-- @@@QScriptValueIterator -->
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<div class="func">
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<h2>Member Function Documentation</h2>
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<!-- $$$QScriptValueIterator[overload1]$$$QScriptValueIteratorconstQScriptValue& -->
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<h3 class="fn"><a name="QScriptValueIterator"></a>QScriptValueIterator::<span class="name">QScriptValueIterator</span> ( const <span class="type"><a href="qscriptvalue.html">QScriptValue</a></span> & <i>object</i> )</h3>
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<p>Constructs an iterator for traversing <i>object</i>. The iterator is set to be at the front of the sequence of properties (before the first property).</p>
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<!-- @@@QScriptValueIterator -->
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<!-- $$$~QScriptValueIterator[overload1]$$$~QScriptValueIterator -->
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<h3 class="fn"><a name="dtor.QScriptValueIterator"></a>QScriptValueIterator::<span class="name">~QScriptValueIterator</span> ()</h3>
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<p>Destroys the iterator.</p>
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<!-- @@@~QScriptValueIterator -->
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<!-- $$$flags[overload1]$$$flags -->
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<h3 class="fn"><a name="flags"></a><span class="type"><a href="qscriptvalue.html#PropertyFlag-enum">QScriptValue::PropertyFlags</a></span> QScriptValueIterator::<span class="name">flags</span> () const</h3>
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<p>Returns the flags of the last property that was jumped over using <a href="qscriptvalueiterator.html#next">next</a>() or <a href="qscriptvalueiterator.html#previous">previous</a>().</p>
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<p><b>See also </b><a href="qscriptvalueiterator.html#value">value</a>().</p>
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<!-- @@@flags -->
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<!-- $$$hasNext[overload1]$$$hasNext -->
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<h3 class="fn"><a name="hasNext"></a><span class="type">bool</span> QScriptValueIterator::<span class="name">hasNext</span> () const</h3>
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<p>Returns true if there is at least one item ahead of the iterator (i.e. the iterator is <i>not</i> at the back of the property sequence); otherwise returns false.</p>
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<p><b>See also </b><a href="qscriptvalueiterator.html#next">next</a>() and <a href="qscriptvalueiterator.html#hasPrevious">hasPrevious</a>().</p>
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<!-- @@@hasNext -->
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<!-- $$$hasPrevious[overload1]$$$hasPrevious -->
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<h3 class="fn"><a name="hasPrevious"></a><span class="type">bool</span> QScriptValueIterator::<span class="name">hasPrevious</span> () const</h3>
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<p>Returns true if there is at least one item behind the iterator (i.e. the iterator is <i>not</i> at the front of the property sequence); otherwise returns false.</p>
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<p><b>See also </b><a href="qscriptvalueiterator.html#previous">previous</a>() and <a href="qscriptvalueiterator.html#hasNext">hasNext</a>().</p>
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<!-- @@@hasPrevious -->
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<!-- $$$name[overload1]$$$name -->
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<h3 class="fn"><a name="name"></a><span class="type"><a href="qstring.html">QString</a></span> QScriptValueIterator::<span class="name">name</span> () const</h3>
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<p>Returns the name of the last property that was jumped over using <a href="qscriptvalueiterator.html#next">next</a>() or <a href="qscriptvalueiterator.html#previous">previous</a>().</p>
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<p><b>See also </b><a href="qscriptvalueiterator.html#value">value</a>() and <a href="qscriptvalueiterator.html#flags">flags</a>().</p>
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<!-- @@@name -->
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<!-- $$$next[overload1]$$$next -->
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<h3 class="fn"><a name="next"></a><span class="type">void</span> QScriptValueIterator::<span class="name">next</span> ()</h3>
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<p>Advances the iterator by one position.</p>
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<p>Calling this function on an iterator located at the back of the container leads to undefined results.</p>
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<p><b>See also </b><a href="qscriptvalueiterator.html#hasNext">hasNext</a>(), <a href="qscriptvalueiterator.html#previous">previous</a>(), and <a href="qscriptvalueiterator.html#name">name</a>().</p>
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<!-- @@@next -->
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<!-- $$$previous[overload1]$$$previous -->
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<h3 class="fn"><a name="previous"></a><span class="type">void</span> QScriptValueIterator::<span class="name">previous</span> ()</h3>
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<p>Moves the iterator back by one position.</p>
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<p>Calling this function on an iterator located at the front of the container leads to undefined results.</p>
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<p><b>See also </b><a href="qscriptvalueiterator.html#hasPrevious">hasPrevious</a>(), <a href="qscriptvalueiterator.html#next">next</a>(), and <a href="qscriptvalueiterator.html#name">name</a>().</p>
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<!-- @@@previous -->
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<!-- $$$remove[overload1]$$$remove -->
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<h3 class="fn"><a name="remove"></a><span class="type">void</span> QScriptValueIterator::<span class="name">remove</span> ()</h3>
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<p>Removes the last property that was jumped over using <a href="qscriptvalueiterator.html#next">next</a>() or <a href="qscriptvalueiterator.html#previous">previous</a>().</p>
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<p><b>See also </b><a href="qscriptvalueiterator.html#setValue">setValue</a>().</p>
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<!-- @@@remove -->
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<!-- $$$scriptName[overload1]$$$scriptName -->
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<h3 class="fn"><a name="scriptName"></a><span class="type"><a href="qscriptstring.html">QScriptString</a></span> QScriptValueIterator::<span class="name">scriptName</span> () const</h3>
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<p>Returns the name of the last property that was jumped over using <a href="qscriptvalueiterator.html#next">next</a>() or <a href="qscriptvalueiterator.html#previous">previous</a>().</p>
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<p>This function was introduced in Qt 4.4.</p>
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<!-- @@@scriptName -->
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<!-- $$$setValue[overload1]$$$setValueconstQScriptValue& -->
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<h3 class="fn"><a name="setValue"></a><span class="type">void</span> QScriptValueIterator::<span class="name">setValue</span> ( const <span class="type"><a href="qscriptvalue.html">QScriptValue</a></span> & <i>value</i> )</h3>
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<p>Sets the <i>value</i> of the last property that was jumped over using <a href="qscriptvalueiterator.html#next">next</a>() or <a href="qscriptvalueiterator.html#previous">previous</a>().</p>
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<p><b>See also </b><a href="qscriptvalueiterator.html#value">value</a>() and <a href="qscriptvalueiterator.html#name">name</a>().</p>
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<!-- @@@setValue -->
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<!-- $$$toBack[overload1]$$$toBack -->
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<h3 class="fn"><a name="toBack"></a><span class="type">void</span> QScriptValueIterator::<span class="name">toBack</span> ()</h3>
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|
<p>Moves the iterator to the back of the <a href="qscriptvalue.html">QScriptValue</a> (after the last property).</p>
|
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<p><b>See also </b><a href="qscriptvalueiterator.html#toFront">toFront</a>() and <a href="qscriptvalueiterator.html#previous">previous</a>().</p>
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<!-- @@@toBack -->
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<!-- $$$toFront[overload1]$$$toFront -->
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<h3 class="fn"><a name="toFront"></a><span class="type">void</span> QScriptValueIterator::<span class="name">toFront</span> ()</h3>
|
|
<p>Moves the iterator to the front of the <a href="qscriptvalue.html">QScriptValue</a> (before the first property).</p>
|
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<p><b>See also </b><a href="qscriptvalueiterator.html#toBack">toBack</a>() and <a href="qscriptvalueiterator.html#next">next</a>().</p>
|
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<!-- @@@toFront -->
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<!-- $$$value[overload1]$$$value -->
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<h3 class="fn"><a name="value"></a><span class="type"><a href="qscriptvalue.html">QScriptValue</a></span> QScriptValueIterator::<span class="name">value</span> () const</h3>
|
|
<p>Returns the value of the last property that was jumped over using <a href="qscriptvalueiterator.html#next">next</a>() or <a href="qscriptvalueiterator.html#previous">previous</a>().</p>
|
|
<p><b>See also </b><a href="qscriptvalueiterator.html#setValue">setValue</a>() and <a href="qscriptvalueiterator.html#name">name</a>().</p>
|
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<!-- @@@value -->
|
|
<!-- $$$operator=[overload1]$$$operator=QScriptValue& -->
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|
<h3 class="fn"><a name="operator-eq"></a><span class="type">QScriptValueIterator</span> & QScriptValueIterator::<span class="name">operator=</span> ( <span class="type"><a href="qscriptvalue.html">QScriptValue</a></span> & <i>object</i> )</h3>
|
|
<p>Makes the iterator operate on <i>object</i>. The iterator is set to be at the front of the sequence of properties (before the first property).</p>
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<!-- @@@operator= -->
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<acronym title="Copyright">©</acronym> 2015 The Qt Company Ltd.
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Documentation contributions included herein are the copyrights of
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The documentation provided herein is licensed under the terms of the
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Documentation sources may be obtained from <a href="http://www.qt-project.org">
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