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1150 lines
62 KiB
1150 lines
62 KiB
14 years ago
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<!-- /home/espenr/tmp/qt-3.3.8-espenr-2499/qt-x11-free-3.3.8/src/kernel/qvariant.cpp:353 -->
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
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<title>QVariant Class</title>
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<td align="right" valign="center"><img src="logo32.png" align="right" width="64" height="32" border="0"></td></tr></table><h1 align=center>QVariant Class Reference</h1>
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<p>The QVariant class acts like a union for the most common Qt data types.
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<a href="#details">More...</a>
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<p><tt>#include <<a href="qvariant-h.html">qvariant.h</a>></tt>
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<p><a href="qvariant-members.html">List of all member functions.</a>
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<h2>Public Members</h2>
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<ul>
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<li class=fn>enum <a href="#Type-enum"><b>Type</b></a> { Invalid, Map, List, String, StringList, Font, Pixmap, Brush, Rect, Size, Color, Palette, ColorGroup, IconSet, Point, Image, Int, UInt, Bool, Double, CString, PointArray, Region, Bitmap, Cursor, SizePolicy, Date, Time, DateTime, ByteArray, BitArray, KeySequence, Pen, LongLong, ULongLong }</li>
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<li class=fn><a href="#QVariant"><b>QVariant</b></a> ()</li>
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<li class=fn><a href="#~QVariant"><b>~QVariant</b></a> ()</li>
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<li class=fn><a href="#QVariant-2"><b>QVariant</b></a> ( const QVariant & p )</li>
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<li class=fn><a href="#QVariant-3"><b>QVariant</b></a> ( QDataStream & s )</li>
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<li class=fn><a href="#QVariant-4"><b>QVariant</b></a> ( const QString & val )</li>
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<li class=fn><a href="#QVariant-5"><b>QVariant</b></a> ( const QCString & val )</li>
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<li class=fn><a href="#QVariant-6"><b>QVariant</b></a> ( const char * val )</li>
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<li class=fn><a href="#QVariant-7"><b>QVariant</b></a> ( const QStringList & val )</li>
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<li class=fn><a href="#QVariant-8"><b>QVariant</b></a> ( const QFont & val )</li>
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<li class=fn><a href="#QVariant-9"><b>QVariant</b></a> ( const QPixmap & val )</li>
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<li class=fn><a href="#QVariant-a"><b>QVariant</b></a> ( const QImage & val )</li>
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<li class=fn><a href="#QVariant-b"><b>QVariant</b></a> ( const QBrush & val )</li>
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<li class=fn><a href="#QVariant-c"><b>QVariant</b></a> ( const QPoint & val )</li>
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<li class=fn><a href="#QVariant-d"><b>QVariant</b></a> ( const QRect & val )</li>
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<li class=fn><a href="#QVariant-e"><b>QVariant</b></a> ( const QSize & val )</li>
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<li class=fn><a href="#QVariant-f"><b>QVariant</b></a> ( const QColor & val )</li>
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<li class=fn><a href="#QVariant-g"><b>QVariant</b></a> ( const QPalette & val )</li>
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<li class=fn><a href="#QVariant-h"><b>QVariant</b></a> ( const QColorGroup & val )</li>
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<li class=fn><a href="#QVariant-i"><b>QVariant</b></a> ( const QIconSet & val )</li>
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<li class=fn><a href="#QVariant-j"><b>QVariant</b></a> ( const QPointArray & val )</li>
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<li class=fn><a href="#QVariant-k"><b>QVariant</b></a> ( const QRegion & val )</li>
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<li class=fn><a href="#QVariant-l"><b>QVariant</b></a> ( const QBitmap & val )</li>
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<li class=fn><a href="#QVariant-m"><b>QVariant</b></a> ( const QCursor & val )</li>
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<li class=fn><a href="#QVariant-n"><b>QVariant</b></a> ( const QDate & val )</li>
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<li class=fn><a href="#QVariant-o"><b>QVariant</b></a> ( const QTime & val )</li>
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<li class=fn><a href="#QVariant-p"><b>QVariant</b></a> ( const QDateTime & val )</li>
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<li class=fn><a href="#QVariant-q"><b>QVariant</b></a> ( const QByteArray & val )</li>
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<li class=fn><a href="#QVariant-r"><b>QVariant</b></a> ( const QBitArray & val )</li>
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<li class=fn><a href="#QVariant-s"><b>QVariant</b></a> ( const QKeySequence & val )</li>
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<li class=fn><a href="#QVariant-t"><b>QVariant</b></a> ( const QPen & val )</li>
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<li class=fn><a href="#QVariant-u"><b>QVariant</b></a> ( const QValueList<QVariant> & val )</li>
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<li class=fn><a href="#QVariant-v"><b>QVariant</b></a> ( const QMap<QString, QVariant> & val )</li>
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<li class=fn><a href="#QVariant-w"><b>QVariant</b></a> ( int val )</li>
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<li class=fn><a href="#QVariant-x"><b>QVariant</b></a> ( uint val )</li>
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<li class=fn><a href="#QVariant-y"><b>QVariant</b></a> ( Q_LLONG val )</li>
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<li class=fn><a href="#QVariant-z"><b>QVariant</b></a> ( Q_ULLONG val )</li>
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<li class=fn><a href="#QVariant-10"><b>QVariant</b></a> ( bool val, int )</li>
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<li class=fn><a href="#QVariant-11"><b>QVariant</b></a> ( double val )</li>
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<li class=fn><a href="#QVariant-12"><b>QVariant</b></a> ( QSizePolicy val )</li>
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<li class=fn>QVariant & <a href="#operator-eq"><b>operator=</b></a> ( const QVariant & variant )</li>
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<li class=fn>bool <a href="#operator-eq-eq"><b>operator==</b></a> ( const QVariant & v ) const</li>
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<li class=fn>bool <a href="#operator!-eq"><b>operator!=</b></a> ( const QVariant & v ) const</li>
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<li class=fn>Type <a href="#type"><b>type</b></a> () const</li>
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<li class=fn>const char * <a href="#typeName"><b>typeName</b></a> () const</li>
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<li class=fn>bool <a href="#canCast"><b>canCast</b></a> ( Type t ) const</li>
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<li class=fn>bool <a href="#cast"><b>cast</b></a> ( Type t )</li>
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<li class=fn>bool <a href="#isValid"><b>isValid</b></a> () const</li>
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<li class=fn>bool <a href="#isNull"><b>isNull</b></a> () const</li>
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<li class=fn>void <a href="#clear"><b>clear</b></a> ()</li>
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<li class=fn>const QString <a href="#toString"><b>toString</b></a> () const</li>
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<li class=fn>const QCString <a href="#toCString"><b>toCString</b></a> () const</li>
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<li class=fn>const QStringList <a href="#toStringList"><b>toStringList</b></a> () const</li>
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<li class=fn>const QFont <a href="#toFont"><b>toFont</b></a> () const</li>
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<li class=fn>const QPixmap <a href="#toPixmap"><b>toPixmap</b></a> () const</li>
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<li class=fn>const QImage <a href="#toImage"><b>toImage</b></a> () const</li>
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<li class=fn>const QBrush <a href="#toBrush"><b>toBrush</b></a> () const</li>
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<li class=fn>const QPoint <a href="#toPoint"><b>toPoint</b></a> () const</li>
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<li class=fn>const QRect <a href="#toRect"><b>toRect</b></a> () const</li>
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<li class=fn>const QSize <a href="#toSize"><b>toSize</b></a> () const</li>
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<li class=fn>const QColor <a href="#toColor"><b>toColor</b></a> () const</li>
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<li class=fn>const QPalette <a href="#toPalette"><b>toPalette</b></a> () const</li>
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<li class=fn>const QColorGroup <a href="#toColorGroup"><b>toColorGroup</b></a> () const</li>
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<li class=fn>const QIconSet <a href="#toIconSet"><b>toIconSet</b></a> () const</li>
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<li class=fn>const QPointArray <a href="#toPointArray"><b>toPointArray</b></a> () const</li>
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<li class=fn>const QBitmap <a href="#toBitmap"><b>toBitmap</b></a> () const</li>
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<li class=fn>const QRegion <a href="#toRegion"><b>toRegion</b></a> () const</li>
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<li class=fn>const QCursor <a href="#toCursor"><b>toCursor</b></a> () const</li>
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<li class=fn>const QDate <a href="#toDate"><b>toDate</b></a> () const</li>
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<li class=fn>const QTime <a href="#toTime"><b>toTime</b></a> () const</li>
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<li class=fn>const QDateTime <a href="#toDateTime"><b>toDateTime</b></a> () const</li>
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<li class=fn>const QByteArray <a href="#toByteArray"><b>toByteArray</b></a> () const</li>
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<li class=fn>const QBitArray <a href="#toBitArray"><b>toBitArray</b></a> () const</li>
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<li class=fn>const QKeySequence <a href="#toKeySequence"><b>toKeySequence</b></a> () const</li>
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<li class=fn>const QPen <a href="#toPen"><b>toPen</b></a> () const</li>
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<li class=fn>int <a href="#toInt"><b>toInt</b></a> ( bool * ok = 0 ) const</li>
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<li class=fn>uint <a href="#toUInt"><b>toUInt</b></a> ( bool * ok = 0 ) const</li>
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<li class=fn>Q_LLONG <a href="#toLongLong"><b>toLongLong</b></a> ( bool * ok = 0 ) const</li>
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<li class=fn>Q_ULLONG <a href="#toULongLong"><b>toULongLong</b></a> ( bool * ok = 0 ) const</li>
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<li class=fn>bool <a href="#toBool"><b>toBool</b></a> () const</li>
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<li class=fn>double <a href="#toDouble"><b>toDouble</b></a> ( bool * ok = 0 ) const</li>
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<li class=fn>const QValueList<QVariant> <a href="#toList"><b>toList</b></a> () const</li>
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<li class=fn>const QMap<QString, QVariant> <a href="#toMap"><b>toMap</b></a> () const</li>
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<li class=fn>QSizePolicy <a href="#toSizePolicy"><b>toSizePolicy</b></a> () const</li>
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<li class=fn>QValueListConstIterator<QString> stringListBegin () const <em>(obsolete)</em></li>
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<li class=fn>QValueListConstIterator<QString> stringListEnd () const <em>(obsolete)</em></li>
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<li class=fn>QValueListConstIterator<QVariant> listBegin () const <em>(obsolete)</em></li>
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<li class=fn>QValueListConstIterator<QVariant> listEnd () const <em>(obsolete)</em></li>
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<li class=fn>QMapConstIterator<QString, QVariant> mapBegin () const <em>(obsolete)</em></li>
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<li class=fn>QMapConstIterator<QString, QVariant> mapEnd () const <em>(obsolete)</em></li>
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<li class=fn>QMapConstIterator<QString, QVariant> mapFind ( const QString & key ) const <em>(obsolete)</em></li>
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<li class=fn>QString & <a href="#asString"><b>asString</b></a> ()</li>
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<li class=fn>QCString & <a href="#asCString"><b>asCString</b></a> ()</li>
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<li class=fn>QStringList & <a href="#asStringList"><b>asStringList</b></a> ()</li>
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<li class=fn>QFont & <a href="#asFont"><b>asFont</b></a> ()</li>
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<li class=fn>QPixmap & <a href="#asPixmap"><b>asPixmap</b></a> ()</li>
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<li class=fn>QImage & <a href="#asImage"><b>asImage</b></a> ()</li>
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<li class=fn>QBrush & <a href="#asBrush"><b>asBrush</b></a> ()</li>
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<li class=fn>QPoint & <a href="#asPoint"><b>asPoint</b></a> ()</li>
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<li class=fn>QRect & <a href="#asRect"><b>asRect</b></a> ()</li>
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<li class=fn>QSize & <a href="#asSize"><b>asSize</b></a> ()</li>
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<li class=fn>QColor & <a href="#asColor"><b>asColor</b></a> ()</li>
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<li class=fn>QPalette & <a href="#asPalette"><b>asPalette</b></a> ()</li>
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<li class=fn>QColorGroup & <a href="#asColorGroup"><b>asColorGroup</b></a> ()</li>
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<li class=fn>QIconSet & <a href="#asIconSet"><b>asIconSet</b></a> ()</li>
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<li class=fn>QPointArray & <a href="#asPointArray"><b>asPointArray</b></a> ()</li>
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<li class=fn>QBitmap & <a href="#asBitmap"><b>asBitmap</b></a> ()</li>
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<li class=fn>QRegion & <a href="#asRegion"><b>asRegion</b></a> ()</li>
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<li class=fn>QCursor & <a href="#asCursor"><b>asCursor</b></a> ()</li>
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<li class=fn>QDate & <a href="#asDate"><b>asDate</b></a> ()</li>
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<li class=fn>QTime & <a href="#asTime"><b>asTime</b></a> ()</li>
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<li class=fn>QDateTime & <a href="#asDateTime"><b>asDateTime</b></a> ()</li>
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<li class=fn>QByteArray & <a href="#asByteArray"><b>asByteArray</b></a> ()</li>
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<li class=fn>QBitArray & <a href="#asBitArray"><b>asBitArray</b></a> ()</li>
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<li class=fn>QKeySequence & <a href="#asKeySequence"><b>asKeySequence</b></a> ()</li>
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<li class=fn>QPen & <a href="#asPen"><b>asPen</b></a> ()</li>
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<li class=fn>int & <a href="#asInt"><b>asInt</b></a> ()</li>
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<li class=fn>uint & <a href="#asUInt"><b>asUInt</b></a> ()</li>
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<li class=fn>Q_LLONG & <a href="#asLongLong"><b>asLongLong</b></a> ()</li>
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<li class=fn>Q_ULLONG & <a href="#asULongLong"><b>asULongLong</b></a> ()</li>
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<li class=fn>bool & <a href="#asBool"><b>asBool</b></a> ()</li>
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<li class=fn>double & <a href="#asDouble"><b>asDouble</b></a> ()</li>
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<li class=fn>QValueList<QVariant> & <a href="#asList"><b>asList</b></a> ()</li>
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<li class=fn>QMap<QString, QVariant> & <a href="#asMap"><b>asMap</b></a> ()</li>
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<li class=fn>QSizePolicy & <a href="#asSizePolicy"><b>asSizePolicy</b></a> ()</li>
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</ul>
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<h2>Static Public Members</h2>
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<ul>
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<li class=fn>const char * <a href="#typeToName"><b>typeToName</b></a> ( Type typ )</li>
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<li class=fn>Type <a href="#nameToType"><b>nameToType</b></a> ( const char * name )</li>
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</ul>
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<hr><a name="details"></a><h2>Detailed Description</h2>
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The QVariant class acts like a union for the most common Qt data types.
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<p>
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<p> Because C++ forbids unions from including types that have
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non-default constructors or destructors, most interesting Qt
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classes cannot be used in unions. Without QVariant, this would be
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a problem for <a href="qobject.html#property">QObject::property</a>() and for database work, etc.
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<p> A QVariant object holds a single value of a single <a href="#type">type</a>() at a
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time. (Some type()s are multi-valued, for example a string list.)
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You can find out what type, T, the variant holds, convert it to a
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different type using one of the asT() functions, e.g. <a href="#asSize">asSize</a>(),
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get its value using one of the toT() functions, e.g. <a href="#toSize">toSize</a>(), and
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check whether the type can be converted to a particular type using
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<a href="#canCast">canCast</a>().
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<p> The methods named toT() (for any supported T, see the <a href="#Type-enum">Type</a>
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documentation for a list) are const. If you ask for the stored
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type, they return a copy of the stored object. If you ask for a
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type that can be generated from the stored type, toT() copies and
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converts and leaves the object itself unchanged. If you ask for a
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type that cannot be generated from the stored type, the result
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depends on the type (see the function documentation for details).
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<p> Note that three data types supported by QVariant are <a href="shclass.html#explicitly-shared">explicitly shared</a>, namely <a href="qimage.html">QImage</a>, <a href="qpointarray.html">QPointArray</a>, and <a href="qcstring.html">QCString</a>, and in these
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cases the toT() methods return a <a href="shclass.html#shallow-copy">shallow copy</a>. In almost all cases
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you must make a <a href="shclass.html#deep-copy">deep copy</a> of the returned values before modifying
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them.
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<p> The asT() functions are not const. They do conversion like the
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toT() methods, set the variant to hold the converted value, and
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return a reference to the new contents of the variant.
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<p> Here is some example code to demonstrate the use of QVariant:
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<p> <pre>
|
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<a href="qdatastream.html">QDataStream</a> out(...);
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QVariant v(123); // The variant now contains an int
|
||
|
|
int x = v.<a href="#toInt">toInt</a>(); // x = 123
|
||
|
|
out << v; // Writes a type tag and an int to out
|
||
|
|
v = <a href="#QVariant">QVariant</a>("hello"); // The variant now contains a QCString
|
||
|
|
v = <a href="#QVariant">QVariant</a>(tr("hello"));// The variant now contains a QString
|
||
|
|
int y = v.<a href="#toInt">toInt</a>(); // y = 0 since v cannot be converted to an int
|
||
|
|
<a href="qstring.html">QString</a> s = v.<a href="#toString">toString</a>(); // s = tr("hello") (see QObject::tr())
|
||
|
|
out << v; // Writes a type tag and a QString to out
|
||
|
|
...
|
||
|
|
<a href="qdatastream.html">QDataStream</a> in(...); // (opening the previously written stream)
|
||
|
|
in >> v; // Reads an Int variant
|
||
|
|
int z = v.<a href="#toInt">toInt</a>(); // z = 123
|
||
|
|
<a href="qapplication.html#qDebug">qDebug</a>("Type is %s", // prints "Type is int"
|
||
|
|
v.<a href="#typeName">typeName</a>());
|
||
|
|
v.<a href="#asInt">asInt</a>() += 100; // The variant now hold the value 223.
|
||
|
|
v = <a href="#QVariant">QVariant</a>( QStringList() );
|
||
|
|
v.<a href="#asStringList">asStringList</a>().append( "Hello" );
|
||
|
|
</pre>
|
||
|
|
|
||
|
|
<p> You can even store <a href="qvaluelist.html">QValueList</a><QVariant>s and
|
||
|
|
<a href="qmap.html">QMap</a><QString,QVariant>s in a variant, so you can easily construct
|
||
|
|
arbitrarily complex data structures of arbitrary types. This is
|
||
|
|
very powerful and versatile, but may prove less memory and speed
|
||
|
|
efficient than storing specific types in standard data structures.
|
||
|
|
<p> QVariant also supports the notion of NULL values, where you have a
|
||
|
|
defined type with no value set.
|
||
|
|
<pre>
|
||
|
|
QVariant x, y( QString() ), z( QString("") );
|
||
|
|
x.<a href="#asInt">asInt</a>();
|
||
|
|
// x.<a href="#isNull">isNull</a>() == TRUE, y.isNull() == TRUE, z.isNull() == FALSE
|
||
|
|
</pre>
|
||
|
|
|
||
|
|
<p> See the <a href="collection.html">Collection Classes</a>.
|
||
|
|
<p>See also <a href="misc.html">Miscellaneous Classes</a> and <a href="objectmodel.html">Object Model</a>.
|
||
|
|
|
||
|
|
<hr><h2>Member Type Documentation</h2>
|
||
|
|
<h3 class=fn><a name="Type-enum"></a>QVariant::Type</h3>
|
||
|
|
|
||
|
|
<p> This enum type defines the types of variable that a QVariant can
|
||
|
|
contain.
|
||
|
|
<ul>
|
||
|
|
<li><tt>QVariant::Invalid</tt> - no type
|
||
|
|
<li><tt>QVariant::BitArray</tt> - a <a href="qbitarray.html">QBitArray</a>
|
||
|
|
<li><tt>QVariant::ByteArray</tt> - a <a href="qbytearray.html">QByteArray</a>
|
||
|
|
<li><tt>QVariant::Bitmap</tt> - a <a href="qbitmap.html">QBitmap</a>
|
||
|
|
<li><tt>QVariant::Bool</tt> - a bool
|
||
|
|
<li><tt>QVariant::Brush</tt> - a <a href="qbrush.html">QBrush</a>
|
||
|
|
<li><tt>QVariant::Color</tt> - a <a href="qcolor.html">QColor</a>
|
||
|
|
<li><tt>QVariant::ColorGroup</tt> - a <a href="qcolorgroup.html">QColorGroup</a>
|
||
|
|
<li><tt>QVariant::Cursor</tt> - a <a href="qcursor.html">QCursor</a>
|
||
|
|
<li><tt>QVariant::Date</tt> - a <a href="qdate.html">QDate</a>
|
||
|
|
<li><tt>QVariant::DateTime</tt> - a <a href="qdatetime.html">QDateTime</a>
|
||
|
|
<li><tt>QVariant::Double</tt> - a double
|
||
|
|
<li><tt>QVariant::Font</tt> - a <a href="qfont.html">QFont</a>
|
||
|
|
<li><tt>QVariant::IconSet</tt> - a <a href="qiconset.html">QIconSet</a>
|
||
|
|
<li><tt>QVariant::Image</tt> - a <a href="qimage.html">QImage</a>
|
||
|
|
<li><tt>QVariant::Int</tt> - an int
|
||
|
|
<li><tt>QVariant::KeySequence</tt> - a <a href="qkeysequence.html">QKeySequence</a>
|
||
|
|
<li><tt>QVariant::List</tt> - a <a href="qvaluelist.html">QValueList</a><QVariant>
|
||
|
|
<li><tt>QVariant::LongLong</tt> - a long long
|
||
|
|
<li><tt>QVariant::ULongLong</tt> - an unsigned long long
|
||
|
|
<li><tt>QVariant::Map</tt> - a <a href="qmap.html">QMap</a><QString,QVariant>
|
||
|
|
<li><tt>QVariant::Palette</tt> - a <a href="qpalette.html">QPalette</a>
|
||
|
|
<li><tt>QVariant::Pen</tt> - a <a href="qpen.html">QPen</a>
|
||
|
|
<li><tt>QVariant::Pixmap</tt> - a <a href="qpixmap.html">QPixmap</a>
|
||
|
|
<li><tt>QVariant::Point</tt> - a <a href="qpoint.html">QPoint</a>
|
||
|
|
<li><tt>QVariant::PointArray</tt> - a <a href="qpointarray.html">QPointArray</a>
|
||
|
|
<li><tt>QVariant::Rect</tt> - a <a href="qrect.html">QRect</a>
|
||
|
|
<li><tt>QVariant::Region</tt> - a <a href="qregion.html">QRegion</a>
|
||
|
|
<li><tt>QVariant::Size</tt> - a <a href="qsize.html">QSize</a>
|
||
|
|
<li><tt>QVariant::SizePolicy</tt> - a <a href="qsizepolicy.html">QSizePolicy</a>
|
||
|
|
<li><tt>QVariant::String</tt> - a <a href="qstring.html">QString</a>
|
||
|
|
<li><tt>QVariant::CString</tt> - a <a href="qcstring.html">QCString</a>
|
||
|
|
<li><tt>QVariant::StringList</tt> - a <a href="qstringlist.html">QStringList</a>
|
||
|
|
<li><tt>QVariant::Time</tt> - a <a href="qtime.html">QTime</a>
|
||
|
|
<li><tt>QVariant::UInt</tt> - an unsigned int
|
||
|
|
</ul><p> Note that Qt's definition of bool depends on the compiler.
|
||
|
|
<a href="qglobal-h.html">qglobal.h</a> has the system-dependent definition of bool.
|
||
|
|
|
||
|
|
<hr><h2>Member Function Documentation</h2>
|
||
|
|
<h3 class=fn><a name="QVariant"></a>QVariant::QVariant ()
|
||
|
|
</h3>
|
||
|
|
Constructs an invalid variant.
|
||
|
|
|
||
|
|
<h3 class=fn><a name="QVariant-10"></a>QVariant::QVariant ( bool val, int )
|
||
|
|
</h3>
|
||
|
|
Constructs a new variant with a boolean value, <em>val</em>. The integer
|
||
|
|
argument is a dummy, necessary for compatibility with some
|
||
|
|
compilers.
|
||
|
|
|
||
|
|
<h3 class=fn><a name="QVariant-11"></a>QVariant::QVariant ( double val )
|
||
|
|
</h3>
|
||
|
|
Constructs a new variant with a floating point value, <em>val</em>.
|
||
|
|
|
||
|
|
<h3 class=fn><a name="QVariant-12"></a>QVariant::QVariant ( <a href="qsizepolicy.html">QSizePolicy</a> val )
|
||
|
|
</h3>
|
||
|
|
Constructs a new variant with a size policy value, <em>val</em>.
|
||
|
|
|
||
|
|
<h3 class=fn><a name="QVariant-2"></a>QVariant::QVariant ( const <a href="qvariant.html">QVariant</a> & p )
|
||
|
|
</h3>
|
||
|
|
Constructs a copy of the variant, <em>p</em>, passed as the argument to
|
||
|
|
this constructor. Usually this is a <a href="shclass.html#deep-copy">deep copy</a>, but a <a href="shclass.html#shallow-copy">shallow copy</a>
|
||
|
|
is made if the stored data type is <a href="shclass.html#explicitly-shared">explicitly shared</a>, as e.g.
|
||
|
|
<a href="qimage.html">QImage</a> is.
|
||
|
|
|
||
|
|
<h3 class=fn><a name="QVariant-3"></a>QVariant::QVariant ( <a href="qdatastream.html">QDataStream</a> & s )
|
||
|
|
</h3>
|
||
|
|
Reads the variant from the data stream, <em>s</em>.
|
||
|
|
|
||
|
|
<h3 class=fn><a name="QVariant-4"></a>QVariant::QVariant ( const <a href="qstring.html">QString</a> & val )
|
||
|
|
</h3>
|
||
|
|
Constructs a new variant with a string value, <em>val</em>.
|
||
|
|
|
||
|
|
<h3 class=fn><a name="QVariant-5"></a>QVariant::QVariant ( const <a href="qcstring.html">QCString</a> & val )
|
||
|
|
</h3>
|
||
|
|
Constructs a new variant with a C-string value, <em>val</em>.
|
||
|
|
<p> If you want to modify the <a href="qcstring.html">QCString</a> after you've passed it to this
|
||
|
|
constructor, we recommend passing a <a href="shclass.html#deep-copy">deep copy</a> (see
|
||
|
|
<a href="qcstring.html#copy">QCString::copy</a>()).
|
||
|
|
|
||
|
|
<h3 class=fn><a name="QVariant-6"></a>QVariant::QVariant ( const char * val )
|
||
|
|
</h3>
|
||
|
|
Constructs a new variant with a C-string value of <em>val</em> if <em>val</em>
|
||
|
|
is non-null. The variant creates a <a href="shclass.html#deep-copy">deep copy</a> of <em>val</em>.
|
||
|
|
<p> If <em>val</em> is null, the resulting variant has type Invalid.
|
||
|
|
|
||
|
|
<h3 class=fn><a name="QVariant-7"></a>QVariant::QVariant ( const <a href="qstringlist.html">QStringList</a> & val )
|
||
|
|
</h3>
|
||
|
|
Constructs a new variant with a string list value, <em>val</em>.
|
||
|
|
|
||
|
|
<h3 class=fn><a name="QVariant-8"></a>QVariant::QVariant ( const <a href="qfont.html">QFont</a> & val )
|
||
|
|
</h3>
|
||
|
|
Constructs a new variant with a font value, <em>val</em>.
|
||
|
|
|
||
|
|
<h3 class=fn><a name="QVariant-9"></a>QVariant::QVariant ( const <a href="qpixmap.html">QPixmap</a> & val )
|
||
|
|
</h3>
|
||
|
|
Constructs a new variant with a pixmap value, <em>val</em>.
|
||
|
|
|
||
|
|
<h3 class=fn><a name="QVariant-a"></a>QVariant::QVariant ( const <a href="qimage.html">QImage</a> & val )
|
||
|
|
</h3>
|
||
|
|
Constructs a new variant with an image value, <em>val</em>.
|
||
|
|
<p> Because <a href="qimage.html">QImage</a> is <a href="shclass.html#explicitly-shared">explicitly shared</a>, you may need to pass a <a href="shclass.html#deep-copy">deep copy</a> to the variant using <a href="qimage.html#copy">QImage::copy</a>(), e.g. if you intend
|
||
|
|
changing the image you've passed later on.
|
||
|
|
|
||
|
|
<h3 class=fn><a name="QVariant-b"></a>QVariant::QVariant ( const <a href="qbrush.html">QBrush</a> & val )
|
||
|
|
</h3>
|
||
|
|
Constructs a new variant with a brush value, <em>val</em>.
|
||
|
|
|
||
|
|
<h3 class=fn><a name="QVariant-c"></a>QVariant::QVariant ( const <a href="qpoint.html">QPoint</a> & val )
|
||
|
|
</h3>
|
||
|
|
Constructs a new variant with a point value, <em>val</em>.
|
||
|
|
|
||
|
|
<h3 class=fn><a name="QVariant-d"></a>QVariant::QVariant ( const <a href="qrect.html">QRect</a> & val )
|
||
|
|
</h3>
|
||
|
|
Constructs a new variant with a rect value, <em>val</em>.
|
||
|
|
|
||
|
|
<h3 class=fn><a name="QVariant-e"></a>QVariant::QVariant ( const <a href="qsize.html">QSize</a> & val )
|
||
|
|
</h3>
|
||
|
|
Constructs a new variant with a size value, <em>val</em>.
|
||
|
|
|
||
|
|
<h3 class=fn><a name="QVariant-f"></a>QVariant::QVariant ( const <a href="qcolor.html">QColor</a> & val )
|
||
|
|
</h3>
|
||
|
|
Constructs a new variant with a color value, <em>val</em>.
|
||
|
|
|
||
|
|
<h3 class=fn><a name="QVariant-g"></a>QVariant::QVariant ( const <a href="qpalette.html">QPalette</a> & val )
|
||
|
|
</h3>
|
||
|
|
Constructs a new variant with a color palette value, <em>val</em>.
|
||
|
|
|
||
|
|
<h3 class=fn><a name="QVariant-h"></a>QVariant::QVariant ( const <a href="qcolorgroup.html">QColorGroup</a> & val )
|
||
|
|
</h3>
|
||
|
|
Constructs a new variant with a color group value, <em>val</em>.
|
||
|
|
|
||
|
|
<h3 class=fn><a name="QVariant-i"></a>QVariant::QVariant ( const <a href="qiconset.html">QIconSet</a> & val )
|
||
|
|
</h3>
|
||
|
|
Constructs a new variant with an icon set value, <em>val</em>.
|
||
|
|
|
||
|
|
<h3 class=fn><a name="QVariant-j"></a>QVariant::QVariant ( const <a href="qpointarray.html">QPointArray</a> & val )
|
||
|
|
</h3>
|
||
|
|
Constructs a new variant with a point array value, <em>val</em>.
|
||
|
|
<p> Because <a href="qpointarray.html">QPointArray</a> is <a href="shclass.html#explicitly-shared">explicitly shared</a>, you may need to pass a
|
||
|
|
<a href="shclass.html#deep-copy">deep copy</a> to the variant using <a href="qpointarray.html#copy">QPointArray::copy</a>(), e.g. if you
|
||
|
|
intend changing the point array you've passed later on.
|
||
|
|
|
||
|
|
<h3 class=fn><a name="QVariant-k"></a>QVariant::QVariant ( const <a href="qregion.html">QRegion</a> & val )
|
||
|
|
</h3>
|
||
|
|
Constructs a new variant with a region value, <em>val</em>.
|
||
|
|
|
||
|
|
<h3 class=fn><a name="QVariant-l"></a>QVariant::QVariant ( const <a href="qbitmap.html">QBitmap</a> & val )
|
||
|
|
</h3>
|
||
|
|
Constructs a new variant with a bitmap value, <em>val</em>.
|
||
|
|
|
||
|
|
<h3 class=fn><a name="QVariant-m"></a>QVariant::QVariant ( const <a href="qcursor.html">QCursor</a> & val )
|
||
|
|
</h3>
|
||
|
|
Constructs a new variant with a cursor value, <em>val</em>.
|
||
|
|
|
||
|
|
<h3 class=fn><a name="QVariant-n"></a>QVariant::QVariant ( const <a href="qdate.html">QDate</a> & val )
|
||
|
|
</h3>
|
||
|
|
Constructs a new variant with a date value, <em>val</em>.
|
||
|
|
|
||
|
|
<h3 class=fn><a name="QVariant-o"></a>QVariant::QVariant ( const <a href="qtime.html">QTime</a> & val )
|
||
|
|
</h3>
|
||
|
|
Constructs a new variant with a time value, <em>val</em>.
|
||
|
|
|
||
|
|
<h3 class=fn><a name="QVariant-p"></a>QVariant::QVariant ( const <a href="qdatetime.html">QDateTime</a> & val )
|
||
|
|
</h3>
|
||
|
|
Constructs a new variant with a date/time value, <em>val</em>.
|
||
|
|
|
||
|
|
<h3 class=fn><a name="QVariant-q"></a>QVariant::QVariant ( const <a href="qbytearray.html">QByteArray</a> & val )
|
||
|
|
</h3>
|
||
|
|
Constructs a new variant with a bytearray value, <em>val</em>.
|
||
|
|
|
||
|
|
<h3 class=fn><a name="QVariant-r"></a>QVariant::QVariant ( const <a href="qbitarray.html">QBitArray</a> & val )
|
||
|
|
</h3>
|
||
|
|
Constructs a new variant with a bitarray value, <em>val</em>.
|
||
|
|
|
||
|
|
<h3 class=fn><a name="QVariant-s"></a>QVariant::QVariant ( const <a href="qkeysequence.html">QKeySequence</a> & val )
|
||
|
|
</h3>
|
||
|
|
Constructs a new variant with a key sequence value, <em>val</em>.
|
||
|
|
|
||
|
|
<h3 class=fn><a name="QVariant-t"></a>QVariant::QVariant ( const <a href="qpen.html">QPen</a> & val )
|
||
|
|
</h3>
|
||
|
|
Constructs a new variant with a pen value, <em>val</em>.
|
||
|
|
|
||
|
|
<h3 class=fn><a name="QVariant-u"></a>QVariant::QVariant ( const <a href="qvaluelist.html">QValueList</a><QVariant> & val )
|
||
|
|
</h3>
|
||
|
|
Constructs a new variant with a list value, <em>val</em>.
|
||
|
|
|
||
|
|
<h3 class=fn><a name="QVariant-v"></a>QVariant::QVariant ( const <a href="qmap.html">QMap</a><QString, QVariant> & val )
|
||
|
|
</h3>
|
||
|
|
Constructs a new variant with a map of QVariants, <em>val</em>.
|
||
|
|
|
||
|
|
<h3 class=fn><a name="QVariant-w"></a>QVariant::QVariant ( int val )
|
||
|
|
</h3>
|
||
|
|
Constructs a new variant with an integer value, <em>val</em>.
|
||
|
|
|
||
|
|
<h3 class=fn><a name="QVariant-x"></a>QVariant::QVariant ( uint val )
|
||
|
|
</h3>
|
||
|
|
Constructs a new variant with an unsigned integer value, <em>val</em>.
|
||
|
|
|
||
|
|
<h3 class=fn><a name="QVariant-y"></a>QVariant::QVariant ( Q_LLONG val )
|
||
|
|
</h3>
|
||
|
|
Constructs a new variant with a long long integer value, <em>val</em>.
|
||
|
|
|
||
|
|
<h3 class=fn><a name="QVariant-z"></a>QVariant::QVariant ( Q_ULLONG val )
|
||
|
|
</h3>
|
||
|
|
Constructs a new variant with an unsigned long long integer value, <em>val</em>.
|
||
|
|
|
||
|
|
<h3 class=fn><a name="~QVariant"></a>QVariant::~QVariant ()
|
||
|
|
</h3>
|
||
|
|
Destroys the QVariant and the contained object.
|
||
|
|
<p> Note that subclasses that reimplement <a href="#clear">clear</a>() should reimplement
|
||
|
|
the destructor to call clear(). This destructor calls clear(), but
|
||
|
|
because it is the destructor, <a href="#clear">QVariant::clear</a>() is called rather
|
||
|
|
than a subclass's clear().
|
||
|
|
|
||
|
|
<h3 class=fn><a href="qbitarray.html">QBitArray</a> & <a name="asBitArray"></a>QVariant::asBitArray ()
|
||
|
|
</h3>
|
||
|
|
|
||
|
|
<p> Tries to convert the variant to hold a <a href="qbitarray.html">QBitArray</a> value. If that is
|
||
|
|
not possible then the variant is set to an empty bitarray.
|
||
|
|
<p> Returns a reference to the stored bitarray.
|
||
|
|
<p> <p>See also <a href="#toBitArray">toBitArray</a>().
|
||
|
|
|
||
|
|
<h3 class=fn><a href="qbitmap.html">QBitmap</a> & <a name="asBitmap"></a>QVariant::asBitmap ()
|
||
|
|
</h3>
|
||
|
|
|
||
|
|
<p> Tries to convert the variant to hold a bitmap value. If that is
|
||
|
|
not possible the variant is set to a null bitmap.
|
||
|
|
<p> Returns a reference to the stored bitmap.
|
||
|
|
<p> <p>See also <a href="#toBitmap">toBitmap</a>().
|
||
|
|
|
||
|
|
<h3 class=fn>bool & <a name="asBool"></a>QVariant::asBool ()
|
||
|
|
</h3>
|
||
|
|
Returns the variant's value as bool reference.
|
||
|
|
|
||
|
|
<h3 class=fn><a href="qbrush.html">QBrush</a> & <a name="asBrush"></a>QVariant::asBrush ()
|
||
|
|
</h3>
|
||
|
|
|
||
|
|
<p> Tries to convert the variant to hold a brush value. If that is not
|
||
|
|
possible the variant is set to a default black brush.
|
||
|
|
<p> Returns a reference to the stored brush.
|
||
|
|
<p> <p>See also <a href="#toBrush">toBrush</a>().
|
||
|
|
|
||
|
|
<h3 class=fn><a href="qbytearray.html">QByteArray</a> & <a name="asByteArray"></a>QVariant::asByteArray ()
|
||
|
|
</h3>
|
||
|
|
|
||
|
|
<p> Tries to convert the variant to hold a <a href="qbytearray.html">QByteArray</a> value. If that
|
||
|
|
is not possible then the variant is set to an empty bytearray.
|
||
|
|
<p> Returns a reference to the stored bytearray.
|
||
|
|
<p> <p>See also <a href="#toByteArray">toByteArray</a>().
|
||
|
|
|
||
|
|
<h3 class=fn><a href="qcstring.html">QCString</a> & <a name="asCString"></a>QVariant::asCString ()
|
||
|
|
</h3>
|
||
|
|
|
||
|
|
<p> Tries to convert the variant to hold a string value. If that is
|
||
|
|
not possible the variant is set to an empty string.
|
||
|
|
<p> Returns a reference to the stored string.
|
||
|
|
<p> <p>See also <a href="#toCString">toCString</a>().
|
||
|
|
|
||
|
|
<h3 class=fn><a href="qcolor.html">QColor</a> & <a name="asColor"></a>QVariant::asColor ()
|
||
|
|
</h3>
|
||
|
|
|
||
|
|
<p> Tries to convert the variant to hold a <a href="qcolor.html">QColor</a> value. If that is
|
||
|
|
not possible the variant is set to an invalid color.
|
||
|
|
<p> Returns a reference to the stored color.
|
||
|
|
<p> <p>See also <a href="#toColor">toColor</a>() and <a href="qcolor.html#isValid">QColor::isValid</a>().
|
||
|
|
|
||
|
|
<h3 class=fn><a href="qcolorgroup.html">QColorGroup</a> & <a name="asColorGroup"></a>QVariant::asColorGroup ()
|
||
|
|
</h3>
|
||
|
|
|
||
|
|
<p> Tries to convert the variant to hold a <a href="qcolorgroup.html">QColorGroup</a> value. If that
|
||
|
|
is not possible the variant is set to a color group of all black
|
||
|
|
colors.
|
||
|
|
<p> Returns a reference to the stored color group.
|
||
|
|
<p> <p>See also <a href="#toColorGroup">toColorGroup</a>().
|
||
|
|
|
||
|
|
<h3 class=fn><a href="qcursor.html">QCursor</a> & <a name="asCursor"></a>QVariant::asCursor ()
|
||
|
|
</h3>
|
||
|
|
|
||
|
|
<p> Tries to convert the variant to hold a <a href="qcursor.html">QCursor</a> value. If that is
|
||
|
|
not possible the variant is set to a default arrow cursor.
|
||
|
|
<p> Returns a reference to the stored cursor.
|
||
|
|
<p> <p>See also <a href="#toCursor">toCursor</a>().
|
||
|
|
|
||
|
|
<h3 class=fn><a href="qdate.html">QDate</a> & <a name="asDate"></a>QVariant::asDate ()
|
||
|
|
</h3>
|
||
|
|
|
||
|
|
<p> Tries to convert the variant to hold a <a href="qdate.html">QDate</a> value. If that is not
|
||
|
|
possible then the variant is set to an invalid date.
|
||
|
|
<p> Returns a reference to the stored date.
|
||
|
|
<p> <p>See also <a href="#toDate">toDate</a>().
|
||
|
|
|
||
|
|
<h3 class=fn><a href="qdatetime.html">QDateTime</a> & <a name="asDateTime"></a>QVariant::asDateTime ()
|
||
|
|
</h3>
|
||
|
|
|
||
|
|
<p> Tries to convert the variant to hold a <a href="qdatetime.html">QDateTime</a> value. If that is
|
||
|
|
not possible then the variant is set to an invalid date/time.
|
||
|
|
<p> Returns a reference to the stored date/time.
|
||
|
|
<p> <p>See also <a href="#toDateTime">toDateTime</a>().
|
||
|
|
|
||
|
|
<h3 class=fn>double & <a name="asDouble"></a>QVariant::asDouble ()
|
||
|
|
</h3>
|
||
|
|
Returns the variant's value as double reference.
|
||
|
|
|
||
|
|
<h3 class=fn><a href="qfont.html">QFont</a> & <a name="asFont"></a>QVariant::asFont ()
|
||
|
|
</h3>
|
||
|
|
|
||
|
|
<p> Tries to convert the variant to hold a <a href="qfont.html">QFont</a>. If that is not
|
||
|
|
possible the variant is set to the application's default font.
|
||
|
|
<p> Returns a reference to the stored font.
|
||
|
|
<p> <p>See also <a href="#toFont">toFont</a>().
|
||
|
|
|
||
|
|
<h3 class=fn><a href="qiconset.html">QIconSet</a> & <a name="asIconSet"></a>QVariant::asIconSet ()
|
||
|
|
</h3>
|
||
|
|
|
||
|
|
<p> Tries to convert the variant to hold a <a href="qiconset.html">QIconSet</a> value. If that is
|
||
|
|
not possible the variant is set to an empty iconset.
|
||
|
|
<p> Returns a reference to the stored iconset.
|
||
|
|
<p> <p>See also <a href="#toIconSet">toIconSet</a>().
|
||
|
|
|
||
|
|
<h3 class=fn><a href="qimage.html">QImage</a> & <a name="asImage"></a>QVariant::asImage ()
|
||
|
|
</h3>
|
||
|
|
|
||
|
|
<p> Tries to convert the variant to hold an image value. If that is
|
||
|
|
not possible the variant is set to a null image.
|
||
|
|
<p> Returns a reference to the stored image.
|
||
|
|
<p> <p>See also <a href="#toImage">toImage</a>().
|
||
|
|
|
||
|
|
<h3 class=fn>int & <a name="asInt"></a>QVariant::asInt ()
|
||
|
|
</h3>
|
||
|
|
Returns the variant's value as int reference.
|
||
|
|
|
||
|
|
<h3 class=fn><a href="qkeysequence.html">QKeySequence</a> & <a name="asKeySequence"></a>QVariant::asKeySequence ()
|
||
|
|
</h3>
|
||
|
|
|
||
|
|
<p> Tries to convert the variant to hold a <a href="qkeysequence.html">QKeySequence</a> value. If that
|
||
|
|
is not possible then the variant is set to an empty key sequence.
|
||
|
|
<p> Returns a reference to the stored key sequence.
|
||
|
|
<p> <p>See also <a href="#toKeySequence">toKeySequence</a>().
|
||
|
|
|
||
|
|
<h3 class=fn><a href="qvaluelist.html">QValueList</a><QVariant> & <a name="asList"></a>QVariant::asList ()
|
||
|
|
</h3>
|
||
|
|
Returns the variant's value as variant list reference.
|
||
|
|
<p> Note that if you want to iterate over the list, you should iterate
|
||
|
|
over a copy, e.g.
|
||
|
|
<pre>
|
||
|
|
<a href="qvaluelist.html">QValueList</a><QVariant> list = myVariant.asList();
|
||
|
|
QValueList<QVariant>::Iterator it = list.<a href="qvaluelist.html#begin">begin</a>();
|
||
|
|
while( it != list.<a href="qvaluelist.html#end">end</a>() ) {
|
||
|
|
myProcessing( *it );
|
||
|
|
++it;
|
||
|
|
}
|
||
|
|
</pre>
|
||
|
|
|
||
|
|
|
||
|
|
<h3 class=fn>Q_LLONG & <a name="asLongLong"></a>QVariant::asLongLong ()
|
||
|
|
</h3>
|
||
|
|
Returns the variant's value as long long reference.
|
||
|
|
|
||
|
|
<h3 class=fn><a href="qmap.html">QMap</a><QString, QVariant> & <a name="asMap"></a>QVariant::asMap ()
|
||
|
|
</h3>
|
||
|
|
Returns the variant's value as variant map reference.
|
||
|
|
<p> Note that if you want to iterate over the map, you should iterate
|
||
|
|
over a copy, e.g.
|
||
|
|
<pre>
|
||
|
|
<a href="qmap.html">QMap</a><QString, QVariant> map = myVariant.asMap();
|
||
|
|
QMap<QString, QVariant>::Iterator it = map.<a href="qmap.html#begin">begin</a>();
|
||
|
|
while( it != map.<a href="qmap.html#end">end</a>() ) {
|
||
|
|
myProcessing( *it );
|
||
|
|
++it;
|
||
|
|
}
|
||
|
|
</pre>
|
||
|
|
|
||
|
|
|
||
|
|
<h3 class=fn><a href="qpalette.html">QPalette</a> & <a name="asPalette"></a>QVariant::asPalette ()
|
||
|
|
</h3>
|
||
|
|
|
||
|
|
<p> Tries to convert the variant to hold a <a href="qpalette.html">QPalette</a> value. If that is
|
||
|
|
not possible the variant is set to a palette of black colors.
|
||
|
|
<p> Returns a reference to the stored palette.
|
||
|
|
<p> <p>See also <a href="#toString">toString</a>().
|
||
|
|
|
||
|
|
<h3 class=fn><a href="qpen.html">QPen</a> & <a name="asPen"></a>QVariant::asPen ()
|
||
|
|
</h3>
|
||
|
|
<p> Tries to convert the variant to hold a <a href="qpen.html">QPen</a> value. If that
|
||
|
|
is not possible then the variant is set to an empty pen.
|
||
|
|
<p> Returns a reference to the stored pen.
|
||
|
|
<p> <p>See also <a href="#toPen">toPen</a>().
|
||
|
|
|
||
|
|
<h3 class=fn><a href="qpixmap.html">QPixmap</a> & <a name="asPixmap"></a>QVariant::asPixmap ()
|
||
|
|
</h3>
|
||
|
|
|
||
|
|
<p> Tries to convert the variant to hold a pixmap value. If that is
|
||
|
|
not possible the variant is set to a null pixmap.
|
||
|
|
<p> Returns a reference to the stored pixmap.
|
||
|
|
<p> <p>See also <a href="#toPixmap">toPixmap</a>().
|
||
|
|
|
||
|
|
<h3 class=fn><a href="qpoint.html">QPoint</a> & <a name="asPoint"></a>QVariant::asPoint ()
|
||
|
|
</h3>
|
||
|
|
|
||
|
|
<p> Tries to convert the variant to hold a point value. If that is not
|
||
|
|
possible the variant is set to a (0, 0) point.
|
||
|
|
<p> Returns a reference to the stored point.
|
||
|
|
<p> <p>See also <a href="#toPoint">toPoint</a>().
|
||
|
|
|
||
|
|
<h3 class=fn><a href="qpointarray.html">QPointArray</a> & <a name="asPointArray"></a>QVariant::asPointArray ()
|
||
|
|
</h3>
|
||
|
|
|
||
|
|
<p> Tries to convert the variant to hold a <a href="qpointarray.html">QPointArray</a> value. If that
|
||
|
|
is not possible the variant is set to an empty point array.
|
||
|
|
<p> Returns a reference to the stored point array.
|
||
|
|
<p> <p>See also <a href="#toPointArray">toPointArray</a>().
|
||
|
|
|
||
|
|
<h3 class=fn><a href="qrect.html">QRect</a> & <a name="asRect"></a>QVariant::asRect ()
|
||
|
|
</h3>
|
||
|
|
|
||
|
|
<p> Tries to convert the variant to hold a rectangle value. If that is
|
||
|
|
not possible the variant is set to an empty rectangle.
|
||
|
|
<p> Returns a reference to the stored rectangle.
|
||
|
|
<p> <p>See also <a href="#toRect">toRect</a>().
|
||
|
|
|
||
|
|
<h3 class=fn><a href="qregion.html">QRegion</a> & <a name="asRegion"></a>QVariant::asRegion ()
|
||
|
|
</h3>
|
||
|
|
|
||
|
|
<p> Tries to convert the variant to hold a <a href="qregion.html">QRegion</a> value. If that is
|
||
|
|
not possible the variant is set to a null region.
|
||
|
|
<p> Returns a reference to the stored region.
|
||
|
|
<p> <p>See also <a href="#toRegion">toRegion</a>().
|
||
|
|
|
||
|
|
<h3 class=fn><a href="qsize.html">QSize</a> & <a name="asSize"></a>QVariant::asSize ()
|
||
|
|
</h3>
|
||
|
|
|
||
|
|
<p> Tries to convert the variant to hold a <a href="qsize.html">QSize</a> value. If that is not
|
||
|
|
possible the variant is set to an invalid size.
|
||
|
|
<p> Returns a reference to the stored size.
|
||
|
|
<p> <p>See also <a href="#toSize">toSize</a>() and <a href="qsize.html#isValid">QSize::isValid</a>().
|
||
|
|
|
||
|
|
<h3 class=fn><a href="qsizepolicy.html">QSizePolicy</a> & <a name="asSizePolicy"></a>QVariant::asSizePolicy ()
|
||
|
|
</h3>
|
||
|
|
|
||
|
|
<p> Tries to convert the variant to hold a <a href="qsizepolicy.html">QSizePolicy</a> value. If that
|
||
|
|
fails, the variant is set to an arbitrary (valid) size policy.
|
||
|
|
|
||
|
|
<h3 class=fn><a href="qstring.html">QString</a> & <a name="asString"></a>QVariant::asString ()
|
||
|
|
</h3>
|
||
|
|
|
||
|
|
<p> Tries to convert the variant to hold a string value. If that is
|
||
|
|
not possible the variant is set to an empty string.
|
||
|
|
<p> Returns a reference to the stored string.
|
||
|
|
<p> <p>See also <a href="#toString">toString</a>().
|
||
|
|
|
||
|
|
<h3 class=fn><a href="qstringlist.html">QStringList</a> & <a name="asStringList"></a>QVariant::asStringList ()
|
||
|
|
</h3>
|
||
|
|
|
||
|
|
<p> Tries to convert the variant to hold a <a href="qstringlist.html">QStringList</a> value. If that
|
||
|
|
is not possible the variant is set to an empty string list.
|
||
|
|
<p> Returns a reference to the stored string list.
|
||
|
|
<p> Note that if you want to iterate over the list, you should
|
||
|
|
iterate over a copy, e.g.
|
||
|
|
<pre>
|
||
|
|
<a href="qstringlist.html">QStringList</a> list = myVariant.asStringList();
|
||
|
|
QStringList::Iterator it = list.<a href="qvaluelist.html#begin">begin</a>();
|
||
|
|
while( it != list.<a href="qvaluelist.html#end">end</a>() ) {
|
||
|
|
myProcessing( *it );
|
||
|
|
++it;
|
||
|
|
}
|
||
|
|
</pre>
|
||
|
|
|
||
|
|
<p> <p>See also <a href="#toStringList">toStringList</a>().
|
||
|
|
|
||
|
|
<h3 class=fn><a href="qtime.html">QTime</a> & <a name="asTime"></a>QVariant::asTime ()
|
||
|
|
</h3>
|
||
|
|
|
||
|
|
<p> Tries to convert the variant to hold a <a href="qtime.html">QTime</a> value. If that is not
|
||
|
|
possible then the variant is set to an invalid time.
|
||
|
|
<p> Returns a reference to the stored time.
|
||
|
|
<p> <p>See also <a href="#toTime">toTime</a>().
|
||
|
|
|
||
|
|
<h3 class=fn>uint & <a name="asUInt"></a>QVariant::asUInt ()
|
||
|
|
</h3>
|
||
|
|
Returns the variant's value as unsigned int reference.
|
||
|
|
|
||
|
|
<h3 class=fn>Q_ULLONG & <a name="asULongLong"></a>QVariant::asULongLong ()
|
||
|
|
</h3>
|
||
|
|
Returns the variant's value as unsigned long long reference.
|
||
|
|
|
||
|
|
<h3 class=fn>bool <a name="canCast"></a>QVariant::canCast ( <a href="qvariant.html#Type-enum">Type</a> t ) const
|
||
|
|
</h3>
|
||
|
|
Returns TRUE if the variant's type can be cast to the requested
|
||
|
|
type, <em>t</em>. Such casting is done automatically when calling the
|
||
|
|
<a href="#toInt">toInt</a>(), <a href="#toBool">toBool</a>(), ... or <a href="#asInt">asInt</a>(), <a href="#asBool">asBool</a>(), ... methods.
|
||
|
|
<p> The following casts are done automatically:
|
||
|
|
<center><table cellpadding="4" cellspacing="2" border="0">
|
||
|
|
<tr bgcolor="#a2c511"> <th valign="top">Type <th valign="top">Automatically Cast To
|
||
|
|
<tr bgcolor="#f0f0f0"> <td valign="top">Bool <td valign="top">Double, Int, UInt, LongLong, ULongLong, String, CString, ByteArray
|
||
|
|
<tr bgcolor="#d0d0d0"> <td valign="top">Color <td valign="top">String. CString. ByteArray
|
||
|
|
<tr bgcolor="#f0f0f0"> <td valign="top">Date <td valign="top">String, CString, ByteArray, DateTime
|
||
|
|
<tr bgcolor="#d0d0d0"> <td valign="top">DateTime <td valign="top">String, CString, ByteArray, Date, Time
|
||
|
|
<tr bgcolor="#f0f0f0"> <td valign="top">Double <td valign="top">String, CString, ByteArray, Int, Bool, UInt, LongLong, ULongLong
|
||
|
|
<tr bgcolor="#d0d0d0"> <td valign="top">Font <td valign="top">String, CString, ByteArray
|
||
|
|
<tr bgcolor="#f0f0f0"> <td valign="top">Int <td valign="top">String, CString, ByteArray, Double, Bool, UInt, LongLong, ULongLong, KeySequence
|
||
|
|
<tr bgcolor="#d0d0d0"> <td valign="top">LongLong <td valign="top">String, CString, ByteArray, Double, Bool, UInt, LongLong, ULongLong, KeySequence
|
||
|
|
<tr bgcolor="#f0f0f0"> <td valign="top">ULongLong <td valign="top">String, CString, ByteArray, Double, Bool, UInt, LongLong, ULongLong, KeySequence
|
||
|
|
<tr bgcolor="#d0d0d0"> <td valign="top">List <td valign="top">StringList (if the list contains only strings or
|
||
|
|
something that can be cast to a string)
|
||
|
|
<tr bgcolor="#f0f0f0"> <td valign="top">String <td valign="top">CString, ByteArray, CString, Int, UInt, Bool, Double, Date,
|
||
|
|
Time, DateTime, KeySequence, Font, Color
|
||
|
|
<tr bgcolor="#d0d0d0"> <td valign="top">CString <td valign="top">String, ByteArray, Int, UInt, Bool, Double, Date, ULongLong, LongLong
|
||
|
|
<tr bgcolor="#f0f0f0"> <td valign="top">ByteArray <td valign="top">String, CString, Int, UInt, Bool, Double, Date, ULongLong, LongLong
|
||
|
|
<tr bgcolor="#d0d0d0"> <td valign="top">StringList <td valign="top">List
|
||
|
|
<tr bgcolor="#f0f0f0"> <td valign="top">Time <td valign="top">String
|
||
|
|
<tr bgcolor="#d0d0d0"> <td valign="top">Int <td valign="top">String, CString, ByteArray, Double, Bool, UInt, LongLong, ULongLong, KeySequence
|
||
|
|
<tr bgcolor="#f0f0f0"> <td valign="top">KeySequence <td valign="top">String, CString, ByteArray, Int, UInt, LongLong, ULongLong
|
||
|
|
</table></center>
|
||
|
|
|
||
|
|
<h3 class=fn>bool <a name="cast"></a>QVariant::cast ( <a href="qvariant.html#Type-enum">Type</a> t )
|
||
|
|
</h3>
|
||
|
|
Casts the variant to the requested type. If the cast cannot be
|
||
|
|
done, the variant is set to the default value of the requested
|
||
|
|
type (e.g. an empty string if the requested type <em>t</em> is
|
||
|
|
QVariant::String, an empty point array if the requested type <em>t</em>
|
||
|
|
is QVariant::PointArray, etc). Returns TRUE if the current type of
|
||
|
|
the variant was successfully cast; otherwise returns FALSE.
|
||
|
|
<p> <p>See also <a href="#canCast">canCast</a>().
|
||
|
|
|
||
|
|
<h3 class=fn>void <a name="clear"></a>QVariant::clear ()
|
||
|
|
</h3>
|
||
|
|
Convert this variant to type Invalid and free up any resources
|
||
|
|
used.
|
||
|
|
|
||
|
|
<h3 class=fn>bool <a name="isNull"></a>QVariant::isNull () const
|
||
|
|
</h3>
|
||
|
|
Returns TRUE if this is a NULL variant, FALSE otherwise.
|
||
|
|
|
||
|
|
<h3 class=fn>bool <a name="isValid"></a>QVariant::isValid () const
|
||
|
|
</h3>
|
||
|
|
|
||
|
|
<p> Returns TRUE if the storage type of this variant is not
|
||
|
|
QVariant::Invalid; otherwise returns FALSE.
|
||
|
|
|
||
|
|
<h3 class=fn><a href="qvaluelistconstiterator.html">QValueListConstIterator</a><QVariant> <a name="listBegin"></a>QVariant::listBegin () const
|
||
|
|
</h3>
|
||
|
|
|
||
|
|
<b>This function is obsolete.</b> It is provided to keep old source working. We strongly advise against using it in new code.
|
||
|
|
<p> Returns an iterator to the first item in the list if the variant's
|
||
|
|
type is appropriate; otherwise returns a null iterator.
|
||
|
|
|
||
|
|
<h3 class=fn><a href="qvaluelistconstiterator.html">QValueListConstIterator</a><QVariant> <a name="listEnd"></a>QVariant::listEnd () const
|
||
|
|
</h3>
|
||
|
|
|
||
|
|
<b>This function is obsolete.</b> It is provided to keep old source working. We strongly advise against using it in new code.
|
||
|
|
<p> Returns the end iterator for the list if the variant's type is
|
||
|
|
appropriate; otherwise returns a null iterator.
|
||
|
|
|
||
|
|
<h3 class=fn><a href="qmapconstiterator.html">QMapConstIterator</a><QString, QVariant> <a name="mapBegin"></a>QVariant::mapBegin () const
|
||
|
|
</h3>
|
||
|
|
|
||
|
|
<b>This function is obsolete.</b> It is provided to keep old source working. We strongly advise against using it in new code.
|
||
|
|
<p> Returns an iterator to the first item in the map, if the variant's
|
||
|
|
type is appropriate; otherwise returns a null iterator.
|
||
|
|
|
||
|
|
<h3 class=fn><a href="qmapconstiterator.html">QMapConstIterator</a><QString, QVariant> <a name="mapEnd"></a>QVariant::mapEnd () const
|
||
|
|
</h3>
|
||
|
|
|
||
|
|
<b>This function is obsolete.</b> It is provided to keep old source working. We strongly advise against using it in new code.
|
||
|
|
<p> Returns the end iterator for the map, if the variant's type is
|
||
|
|
appropriate; otherwise returns a null iterator.
|
||
|
|
|
||
|
|
<h3 class=fn><a href="qmapconstiterator.html">QMapConstIterator</a><QString, QVariant> <a name="mapFind"></a>QVariant::mapFind ( const <a href="qstring.html">QString</a> & key ) const
|
||
|
|
</h3>
|
||
|
|
|
||
|
|
<b>This function is obsolete.</b> It is provided to keep old source working. We strongly advise against using it in new code.
|
||
|
|
<p> Returns an iterator to the item in the map with <em>key</em> as key, if
|
||
|
|
the variant's type is appropriate and <em>key</em> is a valid key;
|
||
|
|
otherwise returns a null iterator.
|
||
|
|
|
||
|
|
<h3 class=fn><a href="qvariant.html#Type-enum">Type</a> <a name="nameToType"></a>QVariant::nameToType ( const char * name )<tt> [static]</tt>
|
||
|
|
</h3>
|
||
|
|
Converts the string representation of the storage type given in <em>name</em>, to its enum representation.
|
||
|
|
<p> If the string representation cannot be converted to any enum
|
||
|
|
representation, the variant is set to <a href="#Type-enum">Invalid</a>.
|
||
|
|
|
||
|
|
<h3 class=fn>bool <a name="operator!-eq"></a>QVariant::operator!= ( const <a href="qvariant.html">QVariant</a> & v ) const
|
||
|
|
</h3>
|
||
|
|
Compares this QVariant with <em>v</em> and returns TRUE if they are not
|
||
|
|
equal; otherwise returns FALSE.
|
||
|
|
|
||
|
|
<h3 class=fn><a href="qvariant.html">QVariant</a> & <a name="operator-eq"></a>QVariant::operator= ( const <a href="qvariant.html">QVariant</a> & variant )
|
||
|
|
</h3>
|
||
|
|
Assigns the value of the variant <em>variant</em> to this variant.
|
||
|
|
<p> This is a <a href="shclass.html#deep-copy">deep copy</a> of the variant, but note that if the variant
|
||
|
|
holds an <a href="shclass.html#explicitly-shared">explicitly shared</a> type such as <a href="qimage.html">QImage</a>, a <a href="shclass.html#shallow-copy">shallow copy</a> is
|
||
|
|
performed.
|
||
|
|
|
||
|
|
<h3 class=fn>bool <a name="operator-eq-eq"></a>QVariant::operator== ( const <a href="qvariant.html">QVariant</a> & v ) const
|
||
|
|
</h3>
|
||
|
|
Compares this QVariant with <em>v</em> and returns TRUE if they are
|
||
|
|
equal; otherwise returns FALSE.
|
||
|
|
|
||
|
|
<h3 class=fn><a href="qvaluelistconstiterator.html">QValueListConstIterator</a><QString> <a name="stringListBegin"></a>QVariant::stringListBegin () const
|
||
|
|
</h3>
|
||
|
|
|
||
|
|
<b>This function is obsolete.</b> It is provided to keep old source working. We strongly advise against using it in new code.
|
||
|
|
<p> Returns an iterator to the first string in the list if the
|
||
|
|
variant's type is StringList; otherwise returns a null iterator.
|
||
|
|
|
||
|
|
<h3 class=fn><a href="qvaluelistconstiterator.html">QValueListConstIterator</a><QString> <a name="stringListEnd"></a>QVariant::stringListEnd () const
|
||
|
|
</h3>
|
||
|
|
|
||
|
|
<b>This function is obsolete.</b> It is provided to keep old source working. We strongly advise against using it in new code.
|
||
|
|
<p> Returns the end iterator for the list if the variant's type is
|
||
|
|
StringList; otherwise returns a null iterator.
|
||
|
|
|
||
|
|
<h3 class=fn>const <a href="qbitarray.html">QBitArray</a> <a name="toBitArray"></a>QVariant::toBitArray () const
|
||
|
|
</h3>
|
||
|
|
Returns the variant as a <a href="qbitarray.html">QBitArray</a> if the variant has <a href="#type">type</a>()
|
||
|
|
BitArray; otherwise returns an empty bitarray.
|
||
|
|
<p> <p>See also <a href="#asBitArray">asBitArray</a>().
|
||
|
|
|
||
|
|
<h3 class=fn>const <a href="qbitmap.html">QBitmap</a> <a name="toBitmap"></a>QVariant::toBitmap () const
|
||
|
|
</h3>
|
||
|
|
Returns the variant as a <a href="qbitmap.html">QBitmap</a> if the variant has <a href="#type">type</a>() Bitmap;
|
||
|
|
otherwise returns a null QBitmap.
|
||
|
|
<p> <p>See also <a href="#asBitmap">asBitmap</a>().
|
||
|
|
|
||
|
|
<h3 class=fn>bool <a name="toBool"></a>QVariant::toBool () const
|
||
|
|
</h3>
|
||
|
|
Returns the variant as a bool if the variant can be cast to Bool;
|
||
|
|
otherWise returns FALSE.
|
||
|
|
<p> Returns TRUE if the variant has a numeric type and its value is
|
||
|
|
non-zero, or if the variant has type String, ByteArray or CString
|
||
|
|
and its lower-case content is not empty, "0" or "false"; otherwise
|
||
|
|
returns FALSE.
|
||
|
|
<p> <p>See also <a href="#asBool">asBool</a>() and <a href="#canCast">canCast</a>().
|
||
|
|
|
||
|
|
<h3 class=fn>const <a href="qbrush.html">QBrush</a> <a name="toBrush"></a>QVariant::toBrush () const
|
||
|
|
</h3>
|
||
|
|
Returns the variant as a <a href="qbrush.html">QBrush</a> if the variant has <a href="#type">type</a>() Brush;
|
||
|
|
otherwise returns a default brush (with all black colors).
|
||
|
|
<p> <p>See also <a href="#asBrush">asBrush</a>().
|
||
|
|
|
||
|
|
<h3 class=fn>const <a href="qbytearray.html">QByteArray</a> <a name="toByteArray"></a>QVariant::toByteArray () const
|
||
|
|
</h3>
|
||
|
|
Returns the variant as a <a href="qbytearray.html">QByteArray</a> if the variant can be cast to
|
||
|
|
a ByteArray; otherwise returns an empty bytearray.
|
||
|
|
<p> <p>See also <a href="#asByteArray">asByteArray</a>() and <a href="#canCast">canCast</a>().
|
||
|
|
|
||
|
|
<h3 class=fn>const <a href="qcstring.html">QCString</a> <a name="toCString"></a>QVariant::toCString () const
|
||
|
|
</h3>
|
||
|
|
Returns the variant as a <a href="qcstring.html">QCString</a> if the variant can be cast to a
|
||
|
|
CString; otherwise returns 0.
|
||
|
|
<p> <p>See also <a href="#asCString">asCString</a>() and <a href="#canCast">canCast</a>().
|
||
|
|
|
||
|
|
<h3 class=fn>const <a href="qcolor.html">QColor</a> <a name="toColor"></a>QVariant::toColor () const
|
||
|
|
</h3>
|
||
|
|
Returns the variant as a <a href="qcolor.html">QColor</a> if the variant can be cast to Color;
|
||
|
|
otherwise returns an invalid color.
|
||
|
|
<p> <p>See also <a href="#asColor">asColor</a>() and <a href="#canCast">canCast</a>().
|
||
|
|
|
||
|
|
<h3 class=fn>const <a href="qcolorgroup.html">QColorGroup</a> <a name="toColorGroup"></a>QVariant::toColorGroup () const
|
||
|
|
</h3>
|
||
|
|
Returns the variant as a <a href="qcolorgroup.html">QColorGroup</a> if the variant has <a href="#type">type</a>()
|
||
|
|
ColorGroup; otherwise returns a completely black color group.
|
||
|
|
<p> <p>See also <a href="#asColorGroup">asColorGroup</a>().
|
||
|
|
|
||
|
|
<h3 class=fn>const <a href="qcursor.html">QCursor</a> <a name="toCursor"></a>QVariant::toCursor () const
|
||
|
|
</h3>
|
||
|
|
Returns the variant as a <a href="qcursor.html">QCursor</a> if the variant has <a href="#type">type</a>() Cursor;
|
||
|
|
otherwise returns the default arrow cursor.
|
||
|
|
<p> <p>See also <a href="#asCursor">asCursor</a>().
|
||
|
|
|
||
|
|
<h3 class=fn>const <a href="qdate.html">QDate</a> <a name="toDate"></a>QVariant::toDate () const
|
||
|
|
</h3>
|
||
|
|
Returns the variant as a <a href="qdate.html">QDate</a> if the variant can be cast to Date;
|
||
|
|
otherwise returns an invalid date.
|
||
|
|
<p> Note that if the <a href="#type">type</a>() is String, CString or ByteArray an invalid
|
||
|
|
date will be returned if the string cannot be parsed as a
|
||
|
|
Qt::ISODate format date.
|
||
|
|
<p> <p>See also <a href="#asDate">asDate</a>() and <a href="#canCast">canCast</a>().
|
||
|
|
|
||
|
|
<h3 class=fn>const <a href="qdatetime.html">QDateTime</a> <a name="toDateTime"></a>QVariant::toDateTime () const
|
||
|
|
</h3>
|
||
|
|
Returns the variant as a <a href="qdatetime.html">QDateTime</a> if the variant can be cast to
|
||
|
|
DateTime; otherwise returns an invalid QDateTime.
|
||
|
|
<p> Note that if the <a href="#type">type</a>() is String, CString or ByteArray an invalid
|
||
|
|
QDateTime will be returned if the string cannot be parsed as a
|
||
|
|
Qt::ISODate format date/time.
|
||
|
|
<p> <p>See also <a href="#asDateTime">asDateTime</a>().
|
||
|
|
|
||
|
|
<h3 class=fn>double <a name="toDouble"></a>QVariant::toDouble ( bool * ok = 0 ) const
|
||
|
|
</h3>
|
||
|
|
Returns the variant as a double if the variant can be cast to
|
||
|
|
Double; otherwise returns 0.0.
|
||
|
|
<p> If <em>ok</em> is non-null: <em>*ok</em> is set to TRUE if the value could be
|
||
|
|
converted to a double; otherwise <em>*ok</em> is set to FALSE.
|
||
|
|
<p> <p>See also <a href="#asDouble">asDouble</a>() and <a href="#canCast">canCast</a>().
|
||
|
|
|
||
|
|
<h3 class=fn>const <a href="qfont.html">QFont</a> <a name="toFont"></a>QVariant::toFont () const
|
||
|
|
</h3>
|
||
|
|
Returns the variant as a <a href="qfont.html">QFont</a> if the variant can be cast to Font;
|
||
|
|
otherwise returns the application's default font.
|
||
|
|
<p> <p>See also <a href="#asFont">asFont</a>() and <a href="#canCast">canCast</a>().
|
||
|
|
|
||
|
|
<h3 class=fn>const <a href="qiconset.html">QIconSet</a> <a name="toIconSet"></a>QVariant::toIconSet () const
|
||
|
|
</h3>
|
||
|
|
Returns the variant as a <a href="qiconset.html">QIconSet</a> if the variant has <a href="#type">type</a>()
|
||
|
|
IconSet; otherwise returns an icon set of null pixmaps.
|
||
|
|
<p> <p>See also <a href="#asIconSet">asIconSet</a>().
|
||
|
|
|
||
|
|
<h3 class=fn>const <a href="qimage.html">QImage</a> <a name="toImage"></a>QVariant::toImage () const
|
||
|
|
</h3>
|
||
|
|
Returns the variant as a <a href="qimage.html">QImage</a> if the variant has <a href="#type">type</a>() Image;
|
||
|
|
otherwise returns a null image.
|
||
|
|
<p> <p>See also <a href="#asImage">asImage</a>().
|
||
|
|
|
||
|
|
<h3 class=fn>int <a name="toInt"></a>QVariant::toInt ( bool * ok = 0 ) const
|
||
|
|
</h3>
|
||
|
|
Returns the variant as an int if the variant can be cast to Int;
|
||
|
|
otherwise returns 0.
|
||
|
|
<p> If <em>ok</em> is non-null: <em>*ok</em> is set to TRUE if the value could be
|
||
|
|
converted to an int; otherwise <em>*ok</em> is set to FALSE.
|
||
|
|
<p> <p>See also <a href="#asInt">asInt</a>() and <a href="#canCast">canCast</a>().
|
||
|
|
|
||
|
|
<h3 class=fn>const <a href="qkeysequence.html">QKeySequence</a> <a name="toKeySequence"></a>QVariant::toKeySequence () const
|
||
|
|
</h3>
|
||
|
|
Returns the variant as a <a href="qkeysequence.html">QKeySequence</a> if the variant can be cast
|
||
|
|
to a KeySequence; otherwise returns an empty key sequence.
|
||
|
|
<p> <p>See also <a href="#asKeySequence">asKeySequence</a>() and <a href="#canCast">canCast</a>().
|
||
|
|
|
||
|
|
<h3 class=fn>const <a href="qvaluelist.html">QValueList</a><QVariant> <a name="toList"></a>QVariant::toList () const
|
||
|
|
</h3>
|
||
|
|
Returns the variant as a <a href="qvaluelist.html">QValueList</a><QVariant> if the variant has
|
||
|
|
<a href="#type">type</a>() List or StringList; otherwise returns an empty list.
|
||
|
|
<p> Note that if you want to iterate over the list, you should iterate
|
||
|
|
over a copy, e.g.
|
||
|
|
<pre>
|
||
|
|
<a href="qvaluelist.html">QValueList</a><QVariant> list = myVariant.toList();
|
||
|
|
QValueList<QVariant>::Iterator it = list.<a href="qvaluelist.html#begin">begin</a>();
|
||
|
|
while( it != list.<a href="qvaluelist.html#end">end</a>() ) {
|
||
|
|
myProcessing( *it );
|
||
|
|
++it;
|
||
|
|
}
|
||
|
|
</pre>
|
||
|
|
|
||
|
|
<p> <p>See also <a href="#asList">asList</a>().
|
||
|
|
|
||
|
|
<h3 class=fn>Q_LLONG <a name="toLongLong"></a>QVariant::toLongLong ( bool * ok = 0 ) const
|
||
|
|
</h3>
|
||
|
|
Returns the variant as a long long int if the variant can be cast
|
||
|
|
to LongLong; otherwise returns 0.
|
||
|
|
<p> If <em>ok</em> is non-null: <em>*ok</em> is set to TRUE if the value could be
|
||
|
|
converted to an int; otherwise <em>*ok</em> is set to FALSE.
|
||
|
|
<p> <p>See also <a href="#asLongLong">asLongLong</a>() and <a href="#canCast">canCast</a>().
|
||
|
|
|
||
|
|
<h3 class=fn>const <a href="qmap.html">QMap</a><QString, QVariant> <a name="toMap"></a>QVariant::toMap () const
|
||
|
|
</h3>
|
||
|
|
Returns the variant as a <a href="qmap.html">QMap</a><QString,QVariant> if the variant has
|
||
|
|
<a href="#type">type</a>() Map; otherwise returns an empty map.
|
||
|
|
<p> Note that if you want to iterate over the map, you should iterate
|
||
|
|
over a copy, e.g.
|
||
|
|
<pre>
|
||
|
|
<a href="qmap.html">QMap</a><QString, QVariant> map = myVariant.toMap();
|
||
|
|
QMap<QString, QVariant>::Iterator it = map.<a href="qmap.html#begin">begin</a>();
|
||
|
|
while( it != map.<a href="qmap.html#end">end</a>() ) {
|
||
|
|
myProcessing( *it );
|
||
|
|
++it;
|
||
|
|
}
|
||
|
|
</pre>
|
||
|
|
|
||
|
|
<p> <p>See also <a href="#asMap">asMap</a>().
|
||
|
|
|
||
|
|
<h3 class=fn>const <a href="qpalette.html">QPalette</a> <a name="toPalette"></a>QVariant::toPalette () const
|
||
|
|
</h3>
|
||
|
|
Returns the variant as a <a href="qpalette.html">QPalette</a> if the variant has <a href="#type">type</a>()
|
||
|
|
Palette; otherwise returns a completely black palette.
|
||
|
|
<p> <p>See also <a href="#asPalette">asPalette</a>().
|
||
|
|
|
||
|
|
<h3 class=fn>const <a href="qpen.html">QPen</a> <a name="toPen"></a>QVariant::toPen () const
|
||
|
|
</h3>
|
||
|
|
Returns the variant as a <a href="qpen.html">QPen</a> if the variant has <a href="#type">type</a>()
|
||
|
|
Pen; otherwise returns an empty QPen.
|
||
|
|
<p> <p>See also <a href="#asPen">asPen</a>().
|
||
|
|
|
||
|
|
<h3 class=fn>const <a href="qpixmap.html">QPixmap</a> <a name="toPixmap"></a>QVariant::toPixmap () const
|
||
|
|
</h3>
|
||
|
|
Returns the variant as a <a href="qpixmap.html">QPixmap</a> if the variant has <a href="#type">type</a>() Pixmap;
|
||
|
|
otherwise returns a null pixmap.
|
||
|
|
<p> <p>See also <a href="#asPixmap">asPixmap</a>().
|
||
|
|
|
||
|
|
<h3 class=fn>const <a href="qpoint.html">QPoint</a> <a name="toPoint"></a>QVariant::toPoint () const
|
||
|
|
</h3>
|
||
|
|
Returns the variant as a <a href="qpoint.html">QPoint</a> if the variant has <a href="#type">type</a>() Point;
|
||
|
|
otherwise returns a point (0, 0).
|
||
|
|
<p> <p>See also <a href="#asPoint">asPoint</a>().
|
||
|
|
|
||
|
|
<h3 class=fn>const <a href="qpointarray.html">QPointArray</a> <a name="toPointArray"></a>QVariant::toPointArray () const
|
||
|
|
</h3>
|
||
|
|
Returns the variant as a <a href="qpointarray.html">QPointArray</a> if the variant has <a href="#type">type</a>()
|
||
|
|
PointArray; otherwise returns an empty QPointArray.
|
||
|
|
<p> <p>See also <a href="#asPointArray">asPointArray</a>().
|
||
|
|
|
||
|
|
<h3 class=fn>const <a href="qrect.html">QRect</a> <a name="toRect"></a>QVariant::toRect () const
|
||
|
|
</h3>
|
||
|
|
Returns the variant as a <a href="qrect.html">QRect</a> if the variant has <a href="#type">type</a>() Rect;
|
||
|
|
otherwise returns an empty rectangle.
|
||
|
|
<p> <p>See also <a href="#asRect">asRect</a>().
|
||
|
|
|
||
|
|
<h3 class=fn>const <a href="qregion.html">QRegion</a> <a name="toRegion"></a>QVariant::toRegion () const
|
||
|
|
</h3>
|
||
|
|
Returns the variant as a <a href="qregion.html">QRegion</a> if the variant has <a href="#type">type</a>() Region;
|
||
|
|
otherwise returns an empty QRegion.
|
||
|
|
<p> <p>See also <a href="#asRegion">asRegion</a>().
|
||
|
|
|
||
|
|
<h3 class=fn>const <a href="qsize.html">QSize</a> <a name="toSize"></a>QVariant::toSize () const
|
||
|
|
</h3>
|
||
|
|
Returns the variant as a <a href="qsize.html">QSize</a> if the variant has <a href="#type">type</a>() Size;
|
||
|
|
otherwise returns an invalid size.
|
||
|
|
<p> <p>See also <a href="#asSize">asSize</a>().
|
||
|
|
|
||
|
|
<h3 class=fn><a href="qsizepolicy.html">QSizePolicy</a> <a name="toSizePolicy"></a>QVariant::toSizePolicy () const
|
||
|
|
</h3>
|
||
|
|
Returns the variant as a <a href="qsizepolicy.html">QSizePolicy</a> if the variant has <a href="#type">type</a>()
|
||
|
|
SizePolicy; otherwise returns an undefined (but legal) size
|
||
|
|
policy.
|
||
|
|
|
||
|
|
<h3 class=fn>const <a href="qstring.html">QString</a> <a name="toString"></a>QVariant::toString () const
|
||
|
|
</h3>
|
||
|
|
Returns the variant as a <a href="qstring.html">QString</a> if the variant can be cast to
|
||
|
|
String, otherwise returns <a href="qstring.html#QString-null">QString::null</a>.
|
||
|
|
<p> <p>See also <a href="#asString">asString</a>() and <a href="#canCast">canCast</a>().
|
||
|
|
|
||
|
|
<h3 class=fn>const <a href="qstringlist.html">QStringList</a> <a name="toStringList"></a>QVariant::toStringList () const
|
||
|
|
</h3>
|
||
|
|
Returns the variant as a <a href="qstringlist.html">QStringList</a> if the variant has <a href="#type">type</a>()
|
||
|
|
StringList or List of a type that can be converted to <a href="qstring.html">QString</a>;
|
||
|
|
otherwise returns an empty list.
|
||
|
|
<p> Note that if you want to iterate over the list, you should iterate
|
||
|
|
over a copy, e.g.
|
||
|
|
<pre>
|
||
|
|
<a href="qstringlist.html">QStringList</a> list = myVariant.toStringList();
|
||
|
|
QStringList::Iterator it = list.<a href="qvaluelist.html#begin">begin</a>();
|
||
|
|
while( it != list.<a href="qvaluelist.html#end">end</a>() ) {
|
||
|
|
myProcessing( *it );
|
||
|
|
++it;
|
||
|
|
}
|
||
|
|
</pre>
|
||
|
|
|
||
|
|
<p> <p>See also <a href="#asStringList">asStringList</a>().
|
||
|
|
|
||
|
|
<h3 class=fn>const <a href="qtime.html">QTime</a> <a name="toTime"></a>QVariant::toTime () const
|
||
|
|
</h3>
|
||
|
|
Returns the variant as a <a href="qtime.html">QTime</a> if the variant can be cast to Time;
|
||
|
|
otherwise returns an invalid date.
|
||
|
|
<p> Note that if the <a href="#type">type</a>() is String, CString or ByteArray an invalid
|
||
|
|
time will be returned if the string cannot be parsed as a
|
||
|
|
Qt::ISODate format time.
|
||
|
|
<p> <p>See also <a href="#asTime">asTime</a>().
|
||
|
|
|
||
|
|
<h3 class=fn>uint <a name="toUInt"></a>QVariant::toUInt ( bool * ok = 0 ) const
|
||
|
|
</h3>
|
||
|
|
Returns the variant as an unsigned int if the variant can be cast
|
||
|
|
to UInt; otherwise returns 0.
|
||
|
|
<p> If <em>ok</em> is non-null: <em>*ok</em> is set to TRUE if the value could be
|
||
|
|
converted to an unsigned int; otherwise <em>*ok</em> is set to FALSE.
|
||
|
|
<p> <p>See also <a href="#asUInt">asUInt</a>() and <a href="#canCast">canCast</a>().
|
||
|
|
|
||
|
|
<h3 class=fn>Q_ULLONG <a name="toULongLong"></a>QVariant::toULongLong ( bool * ok = 0 ) const
|
||
|
|
</h3>
|
||
|
|
Returns the variant as as an unsigned long long int if the variant
|
||
|
|
can be cast to ULongLong; otherwise returns 0.
|
||
|
|
<p> If <em>ok</em> is non-null: <em>*ok</em> is set to TRUE if the value could be
|
||
|
|
converted to an int; otherwise <em>*ok</em> is set to FALSE.
|
||
|
|
<p> <p>See also <a href="#asULongLong">asULongLong</a>() and <a href="#canCast">canCast</a>().
|
||
|
|
|
||
|
|
<h3 class=fn><a href="qvariant.html#Type-enum">Type</a> <a name="type"></a>QVariant::type () const
|
||
|
|
</h3>
|
||
|
|
|
||
|
|
<p> Returns the storage type of the value stored in the variant.
|
||
|
|
Usually it's best to test with <a href="#canCast">canCast</a>() whether the variant can
|
||
|
|
deliver the data type you are interested in.
|
||
|
|
|
||
|
|
<h3 class=fn>const char * <a name="typeName"></a>QVariant::typeName () const
|
||
|
|
</h3>
|
||
|
|
Returns the name of the type stored in the variant. The returned
|
||
|
|
strings describe the C++ datatype used to store the data: for
|
||
|
|
example, "QFont", "QString", or "QValueList<QVariant>". An Invalid
|
||
|
|
variant returns 0.
|
||
|
|
|
||
|
|
<h3 class=fn>const char * <a name="typeToName"></a>QVariant::typeToName ( <a href="qvariant.html#Type-enum">Type</a> typ )<tt> [static]</tt>
|
||
|
|
</h3>
|
||
|
|
Converts the enum representation of the storage type, <em>typ</em>, to
|
||
|
|
its string representation.
|
||
|
|
|
||
|
|
<!-- eof -->
|
||
|
|
<hr><p>
|
||
|
|
This file is part of the <a href="index.html">Qt toolkit</a>.
|
||
|
|
Copyright © 1995-2007
|
||
|
|
<a href="http://www.trolltech.com/">Trolltech</a>. All Rights Reserved.<p><address><hr><div align=center>
|
||
|
|
<table width=100% cellspacing=0 border=0><tr>
|
||
|
|
<td>Copyright © 2007
|
||
|
|
<a href="troll.html">Trolltech</a><td align=center><a href="trademarks.html">Trademarks</a>
|
||
|
|
<td align=right><div align=right>Qt 3.3.8</div>
|
||
|
|
</table></div></address></body>
|
||
|
|
</html>
|