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379 lines
18 KiB
379 lines
18 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/qsize.cpp:42 -->
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<title>QSize 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>QSize Class Reference</h1>
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<p>The QSize class defines the size of a two-dimensional object.
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<a href="#details">More...</a>
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<p><tt>#include <<a href="qsize-h.html">qsize.h</a>></tt>
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<p><a href="qsize-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="#ScaleMode-enum"><b>ScaleMode</b></a> { ScaleFree, ScaleMin, ScaleMax }</li>
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<li class=fn><a href="#QSize"><b>QSize</b></a> ()</li>
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<li class=fn><a href="#QSize-2"><b>QSize</b></a> ( int w, int h )</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>bool <a href="#isEmpty"><b>isEmpty</b></a> () const</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>int <a href="#width"><b>width</b></a> () const</li>
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<li class=fn>int <a href="#height"><b>height</b></a> () const</li>
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<li class=fn>void <a href="#setWidth"><b>setWidth</b></a> ( int w )</li>
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<li class=fn>void <a href="#setHeight"><b>setHeight</b></a> ( int h )</li>
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<li class=fn>void <a href="#transpose"><b>transpose</b></a> ()</li>
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<li class=fn>void <a href="#scale"><b>scale</b></a> ( int w, int h, ScaleMode mode )</li>
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<li class=fn>void <a href="#scale-2"><b>scale</b></a> ( const QSize & s, ScaleMode mode )</li>
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<li class=fn>QSize <a href="#expandedTo"><b>expandedTo</b></a> ( const QSize & otherSize ) const</li>
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<li class=fn>QSize <a href="#boundedTo"><b>boundedTo</b></a> ( const QSize & otherSize ) const</li>
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<li class=fn>QCOORD & <a href="#rwidth"><b>rwidth</b></a> ()</li>
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<li class=fn>QCOORD & <a href="#rheight"><b>rheight</b></a> ()</li>
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<li class=fn>QSize & <a href="#operator+-eq"><b>operator+=</b></a> ( const QSize & s )</li>
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<li class=fn>QSize & <a href="#operator--eq"><b>operator-=</b></a> ( const QSize & s )</li>
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<li class=fn>QSize & <a href="#operator*-eq"><b>operator*=</b></a> ( int c )</li>
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<li class=fn>QSize & <a href="#operator*-eq-2"><b>operator*=</b></a> ( double c )</li>
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<li class=fn>QSize & <a href="#operator/-eq"><b>operator/=</b></a> ( int c )</li>
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<li class=fn>QSize & <a href="#operator/-eq-2"><b>operator/=</b></a> ( double c )</li>
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</ul>
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<h2>Related Functions</h2>
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<ul>
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<li class=fn>bool <a href="#operator-eq-eq"><b>operator==</b></a> ( const QSize & s1, const QSize & s2 )</li>
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<li class=fn>bool <a href="#operator!-eq"><b>operator!=</b></a> ( const QSize & s1, const QSize & s2 )</li>
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<li class=fn>const QSize <a href="#operator+"><b>operator+</b></a> ( const QSize & s1, const QSize & s2 )</li>
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<li class=fn>const QSize <a href="#operator-"><b>operator-</b></a> ( const QSize & s1, const QSize & s2 )</li>
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<li class=fn>const QSize <a href="#operator*"><b>operator*</b></a> ( const QSize & s, int c )</li>
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<li class=fn>const QSize <a href="#operator*-2"><b>operator*</b></a> ( int c, const QSize & s )</li>
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<li class=fn>const QSize <a href="#operator*-3"><b>operator*</b></a> ( const QSize & s, double c )</li>
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<li class=fn>const QSize <a href="#operator*-4"><b>operator*</b></a> ( double c, const QSize & s )</li>
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<li class=fn>const QSize <a href="#operator/"><b>operator/</b></a> ( const QSize & s, int c )</li>
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<li class=fn>const QSize <a href="#operator/-2"><b>operator/</b></a> ( const QSize & s, double c )</li>
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<li class=fn>QDataStream & <a href="#operator-lt-lt"><b>operator<<</b></a> ( QDataStream & s, const QSize & sz )</li>
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<li class=fn>QDataStream & <a href="#operator-gt-gt"><b>operator>></b></a> ( QDataStream & s, QSize & sz )</li>
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</ul>
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<hr><a name="details"></a><h2>Detailed Description</h2>
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The QSize class defines the size of a two-dimensional object.
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<p>
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<p> A size is specified by a width and a height.
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<p> The coordinate type is QCOORD (defined in <tt><qwindowdefs.h></tt> as <tt>int</tt>).
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The minimum value of QCOORD is QCOORD_MIN (-2147483648) and the maximum
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value is QCOORD_MAX (2147483647).
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<p> The size can be set in the constructor and changed with <a href="#setWidth">setWidth</a>()
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and <a href="#setHeight">setHeight</a>(), or using <a href="#operator+-eq">operator+=</a>(), <a href="#operator--eq">operator-=</a>(), <a href="#operator*-eq">operator*=</a>()
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and <a href="#operator/-eq">operator/=</a>(), etc. You can swap the width and height with
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<a href="#transpose">transpose</a>(). You can get a size which holds the maximum height and
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width of two sizes using <a href="#expandedTo">expandedTo</a>(), and the minimum height and
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width of two sizes using <a href="#boundedTo">boundedTo</a>().
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<p> <p>See also <a href="qpoint.html">QPoint</a>, <a href="qrect.html">QRect</a>, <a href="graphics.html">Graphics Classes</a>, and <a href="images.html">Image Processing Classes</a>.
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<hr><h2>Member Type Documentation</h2>
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<h3 class=fn><a name="ScaleMode-enum"></a>QSize::ScaleMode</h3>
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<p> This enum type defines the different ways of scaling a size.
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<p> <center><img src="scaling.png"></center>
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<ul>
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<li><tt>QSize::ScaleFree</tt> - The size is scaled freely. The ratio is not preserved.
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<li><tt>QSize::ScaleMin</tt> - The size is scaled to a rectangle as large as possible
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inside a given rectangle, preserving the aspect ratio.
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<li><tt>QSize::ScaleMax</tt> - The size is scaled to a rectangle as small as possible
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outside a given rectangle, preserving the aspect ratio.
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</ul><p> <p>See also <a href="#scale">QSize::scale</a>(), <a href="qimage.html#scale">QImage::scale</a>(), and <a href="qimage.html#smoothScale">QImage::smoothScale</a>().
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<hr><h2>Member Function Documentation</h2>
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<h3 class=fn><a name="QSize"></a>QSize::QSize ()
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</h3>
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Constructs a size with invalid (negative) width and height.
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<h3 class=fn><a name="QSize-2"></a>QSize::QSize ( int w, int h )
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</h3>
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Constructs a size with width <em>w</em> and height <em>h</em>.
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<h3 class=fn><a href="qsize.html">QSize</a> <a name="boundedTo"></a>QSize::boundedTo ( const <a href="qsize.html">QSize</a> & otherSize ) const
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</h3>
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<p> Returns a size with the minimum width and height of this size and
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<em>otherSize</em>.
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<h3 class=fn><a href="qsize.html">QSize</a> <a name="expandedTo"></a>QSize::expandedTo ( const <a href="qsize.html">QSize</a> & otherSize ) const
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</h3>
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<p> Returns a size with the maximum width and height of this size and
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<em>otherSize</em>.
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<p>Examples: <a href="customlayout-example.html#x1528">customlayout/card.cpp</a> and <a href="customlayout-example.html#x1485">customlayout/flow.cpp</a>.
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<h3 class=fn>int <a name="height"></a>QSize::height () const
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</h3>
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Returns the height.
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<p>See also <a href="#width">width</a>().
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<p>Examples: <a href="movies-example.html#x520">movies/main.cpp</a>, <a href="qfd-example.html#x2007">qfd/fontdisplayer.cpp</a>, and <a href="qfd-example.html#x2016">qfd/qfd.cpp</a>.
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<h3 class=fn>bool <a name="isEmpty"></a>QSize::isEmpty () const
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</h3>
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Returns TRUE if the width is less than or equal to 0, or the height is
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less than or equal to 0; otherwise returns FALSE.
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<h3 class=fn>bool <a name="isNull"></a>QSize::isNull () const
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</h3>
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Returns TRUE if the width is 0 and the height is 0; otherwise
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returns FALSE.
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<h3 class=fn>bool <a name="isValid"></a>QSize::isValid () const
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</h3>
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Returns TRUE if the width is equal to or greater than 0 and the height is
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equal to or greater than 0; otherwise returns FALSE.
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<h3 class=fn><a href="qsize.html">QSize</a> & <a name="operator*-eq"></a>QSize::operator*= ( int c )
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</h3>
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Multiplies both the width and height by <em>c</em> and returns a reference to
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the size.
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<h3 class=fn><a href="qsize.html">QSize</a> & <a name="operator*-eq-2"></a>QSize::operator*= ( double c )
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</h3>
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This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
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<p> Multiplies both the width and height by <em>c</em> and returns a reference to
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the size.
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<p> Note that the result is truncated.
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<h3 class=fn><a href="qsize.html">QSize</a> & <a name="operator+-eq"></a>QSize::operator+= ( const <a href="qsize.html">QSize</a> & s )
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</h3>
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<p> Adds <em>s</em> to the size and returns a reference to this size.
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<p> Example:
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<pre>
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QSize s( 3, 7 );
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QSize r( -1, 4 );
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s += r; // s becomes (2,11)
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</pre>
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<h3 class=fn><a href="qsize.html">QSize</a> & <a name="operator--eq"></a>QSize::operator-= ( const <a href="qsize.html">QSize</a> & s )
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</h3>
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<p> Subtracts <em>s</em> from the size and returns a reference to this size.
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<p> Example:
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<pre>
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QSize s( 3, 7 );
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QSize r( -1, 4 );
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s -= r; // s becomes (4,3)
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</pre>
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<h3 class=fn><a href="qsize.html">QSize</a> & <a name="operator/-eq"></a>QSize::operator/= ( int c )
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</h3>
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Divides both the width and height by <em>c</em> and returns a reference to the
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size.
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<h3 class=fn><a href="qsize.html">QSize</a> & <a name="operator/-eq-2"></a>QSize::operator/= ( double c )
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</h3>
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This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
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<p> Divides both the width and height by <em>c</em> and returns a reference to the
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size.
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<p> Note that the result is truncated.
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<h3 class=fn>QCOORD & <a name="rheight"></a>QSize::rheight ()
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</h3>
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Returns a reference to the height.
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<p> Using a reference makes it possible to directly manipulate the height.
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<p> Example:
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<pre>
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QSize s( 100, 10 );
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s.<a href="#rheight">rheight</a>() += 5; // s becomes (100,15)
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</pre>
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<p> <p>See also <a href="#rwidth">rwidth</a>().
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<h3 class=fn>QCOORD & <a name="rwidth"></a>QSize::rwidth ()
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</h3>
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Returns a reference to the width.
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<p> Using a reference makes it possible to directly manipulate the width.
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<p> Example:
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<pre>
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QSize s( 100, 10 );
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s.<a href="#rwidth">rwidth</a>() += 20; // s becomes (120,10)
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</pre>
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<p> <p>See also <a href="#rheight">rheight</a>().
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<h3 class=fn>void <a name="scale"></a>QSize::scale ( int w, int h, <a href="qsize.html#ScaleMode-enum">ScaleMode</a> mode )
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</h3>
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Scales the size to a rectangle of width <em>w</em> and height <em>h</em> according
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to the ScaleMode <em>mode</em>.
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<p> <ul>
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<li> If <em>mode</em> is <a href="#ScaleMode-enum">ScaleFree</a>, the size is set to (<em>w</em>, <em>h</em>).
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<li> If <em>mode</em> is <a href="#ScaleMode-enum">ScaleMin</a>, the current size is scaled to a rectangle
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as large as possible inside (<em>w</em>, <em>h</em>), preserving the aspect ratio.
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<li> If <em>mode</em> is <a href="#ScaleMode-enum">ScaleMax</a>, the current size is scaled to a rectangle
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as small as possible outside (<em>w</em>, <em>h</em>), preserving the aspect ratio.
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</ul>
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<p> Example:
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<pre>
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QSize t1( 10, 12 );
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t1.<a href="#scale">scale</a>( 60, 60, QSize::<a href="#ScaleMode-enum">ScaleFree</a> );
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// t1 is (60, 60)
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QSize t2( 10, 12 );
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t2.<a href="#scale">scale</a>( 60, 60, QSize::<a href="#ScaleMode-enum">ScaleMin</a> );
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// t2 is (50, 60)
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QSize t3( 10, 12 );
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t3.<a href="#scale">scale</a>( 60, 60, QSize::<a href="#ScaleMode-enum">ScaleMax</a> );
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// t3 is (60, 72)
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</pre>
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<h3 class=fn>void <a name="scale-2"></a>QSize::scale ( const <a href="qsize.html">QSize</a> & s, <a href="qsize.html#ScaleMode-enum">ScaleMode</a> mode )
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</h3>
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This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
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<p> Equivalent to <a href="#scale">scale</a>(<em>s</em>.<a href="#width">width</a>(), <em>s</em>.<a href="#height">height</a>(), <em>mode</em>).
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<h3 class=fn>void <a name="setHeight"></a>QSize::setHeight ( int h )
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</h3>
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Sets the height to <em>h</em>.
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<p>See also <a href="#height">height</a>() and <a href="#setWidth">setWidth</a>().
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||
|
|
|
||
|
|
<h3 class=fn>void <a name="setWidth"></a>QSize::setWidth ( int w )
|
||
|
|
</h3>
|
||
|
|
|
||
|
|
Sets the width to <em>w</em>.
|
||
|
|
<p>See also <a href="#width">width</a>() and <a href="#setHeight">setHeight</a>().
|
||
|
|
|
||
|
|
<h3 class=fn>void <a name="transpose"></a>QSize::transpose ()
|
||
|
|
</h3>
|
||
|
|
Swaps the values of width and height.
|
||
|
|
|
||
|
|
<h3 class=fn>int <a name="width"></a>QSize::width () const
|
||
|
|
</h3>
|
||
|
|
|
||
|
|
Returns the width.
|
||
|
|
<p>See also <a href="#height">height</a>().
|
||
|
|
|
||
|
|
<p>Examples: <a href="movies-example.html#x521">movies/main.cpp</a>, <a href="qfd-example.html#x2008">qfd/fontdisplayer.cpp</a>, and <a href="qfd-example.html#x2017">qfd/qfd.cpp</a>.
|
||
|
|
<hr><h2>Related Functions</h2>
|
||
|
|
<h3 class=fn>bool <a name="operator!-eq"></a>operator!= ( const <a href="qsize.html">QSize</a> & s1, const <a href="qsize.html">QSize</a> & s2 )
|
||
|
|
</h3>
|
||
|
|
|
||
|
|
|
||
|
|
Returns TRUE if <em>s1</em> and <em>s2</em> are different; otherwise returns FALSE.
|
||
|
|
|
||
|
|
<h3 class=fn>const <a href="qsize.html">QSize</a> <a name="operator*"></a>operator* ( const <a href="qsize.html">QSize</a> & s, int c )
|
||
|
|
</h3>
|
||
|
|
|
||
|
|
|
||
|
|
Multiplies <em>s</em> by <em>c</em> and returns the result.
|
||
|
|
|
||
|
|
<h3 class=fn>const <a href="qsize.html">QSize</a> <a name="operator*-2"></a>operator* ( int c, const <a href="qsize.html">QSize</a> & s )
|
||
|
|
</h3>
|
||
|
|
This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
|
||
|
|
<p>
|
||
|
|
Multiplies <em>s</em> by <em>c</em> and returns the result.
|
||
|
|
|
||
|
|
<h3 class=fn>const <a href="qsize.html">QSize</a> <a name="operator*-3"></a>operator* ( const <a href="qsize.html">QSize</a> & s, double c )
|
||
|
|
</h3>
|
||
|
|
This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
|
||
|
|
<p>
|
||
|
|
Multiplies <em>s</em> by <em>c</em> and returns the result.
|
||
|
|
|
||
|
|
<h3 class=fn>const <a href="qsize.html">QSize</a> <a name="operator*-4"></a>operator* ( double c, const <a href="qsize.html">QSize</a> & s )
|
||
|
|
</h3>
|
||
|
|
This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
|
||
|
|
<p>
|
||
|
|
Multiplies <em>s</em> by <em>c</em> and returns the result.
|
||
|
|
|
||
|
|
<h3 class=fn>const <a href="qsize.html">QSize</a> <a name="operator+"></a>operator+ ( const <a href="qsize.html">QSize</a> & s1, const <a href="qsize.html">QSize</a> & s2 )
|
||
|
|
</h3>
|
||
|
|
|
||
|
|
|
||
|
|
Returns the sum of <em>s1</em> and <em>s2</em>; each component is added separately.
|
||
|
|
|
||
|
|
<h3 class=fn>const <a href="qsize.html">QSize</a> <a name="operator-"></a>operator- ( const <a href="qsize.html">QSize</a> & s1, const <a href="qsize.html">QSize</a> & s2 )
|
||
|
|
</h3>
|
||
|
|
|
||
|
|
|
||
|
|
Returns <em>s2</em> subtracted from <em>s1</em>; each component is
|
||
|
|
subtracted separately.
|
||
|
|
|
||
|
|
<h3 class=fn>const <a href="qsize.html">QSize</a> <a name="operator/"></a>operator/ ( const <a href="qsize.html">QSize</a> & s, int c )
|
||
|
|
</h3>
|
||
|
|
|
||
|
|
|
||
|
|
Divides <em>s</em> by <em>c</em> and returns the result.
|
||
|
|
|
||
|
|
<h3 class=fn>const <a href="qsize.html">QSize</a> <a name="operator/-2"></a>operator/ ( const <a href="qsize.html">QSize</a> & s, double c )
|
||
|
|
</h3>
|
||
|
|
|
||
|
|
|
||
|
|
This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
|
||
|
|
<p> Divides <em>s</em> by <em>c</em> and returns the result.
|
||
|
|
<p> Note that the result is truncated.
|
||
|
|
|
||
|
|
<h3 class=fn><a href="qdatastream.html">QDataStream</a> & <a name="operator-lt-lt"></a>operator<< ( <a href="qdatastream.html">QDataStream</a> & s, const <a href="qsize.html">QSize</a> & sz )
|
||
|
|
</h3>
|
||
|
|
|
||
|
|
Writes the size <em>sz</em> to the stream <em>s</em> and returns a reference to
|
||
|
|
the stream.
|
||
|
|
<p> <p>See also <a href="datastreamformat.html">Format of the QDataStream operators</a>.
|
||
|
|
|
||
|
|
<h3 class=fn>bool <a name="operator-eq-eq"></a>operator== ( const <a href="qsize.html">QSize</a> & s1, const <a href="qsize.html">QSize</a> & s2 )
|
||
|
|
</h3>
|
||
|
|
|
||
|
|
|
||
|
|
Returns TRUE if <em>s1</em> and <em>s2</em> are equal; otherwise returns FALSE.
|
||
|
|
|
||
|
|
<h3 class=fn><a href="qdatastream.html">QDataStream</a> & <a name="operator-gt-gt"></a>operator>> ( <a href="qdatastream.html">QDataStream</a> & s, <a href="qsize.html">QSize</a> & sz )
|
||
|
|
</h3>
|
||
|
|
|
||
|
|
Reads the size from the stream <em>s</em> into size <em>sz</em> and returns a
|
||
|
|
reference to the stream.
|
||
|
|
<p> <p>See also <a href="datastreamformat.html">Format of the QDataStream operators</a>.
|
||
|
|
|
||
|
|
<!-- 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>
|