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143 lines
6.8 KiB
143 lines
6.8 KiB
14 years ago
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
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<!-- /home/espenr/tmp/qt-3.3.8-espenr-2499/qt-x11-free-3.3.8/src/kernel/qasyncimageio.cpp:51 -->
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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>QImageConsumer Class</title>
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<style type="text/css"><!--
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<tr bgcolor="#E5E5E5">
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<td valign=center>
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<a href="index.html">
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<font color="#004faf">Home</font></a>
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<font color="#004faf">All Classes</font></a>
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<font color="#004faf">Main Classes</font></a>
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<font color="#004faf">Annotated</font></a>
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<font color="#004faf">Functions</font></a>
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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>QImageConsumer Class Reference</h1>
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<p>The QImageConsumer class is an abstraction used by QImageDecoder.
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<a href="#details">More...</a>
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<p><tt>#include <<a href="qasyncimageio-h.html">qasyncimageio.h</a>></tt>
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<p><a href="qimageconsumer-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>virtual void <a href="#end"><b>end</b></a> () = 0</li>
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<li class=fn>virtual void <a href="#changed"><b>changed</b></a> ( const QRect & ) = 0</li>
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<li class=fn>virtual void <a href="#frameDone"><b>frameDone</b></a> () = 0</li>
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<li class=fn>virtual void <a href="#frameDone-2"><b>frameDone</b></a> ( const QPoint & offset, const QRect & rect ) = 0</li>
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<li class=fn>virtual void <a href="#setLooping"><b>setLooping</b></a> ( int n ) = 0</li>
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<li class=fn>virtual void <a href="#setFramePeriod"><b>setFramePeriod</b></a> ( int milliseconds ) = 0</li>
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<li class=fn>virtual void <a href="#setSize"><b>setSize</b></a> ( int, int ) = 0</li>
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</ul>
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<hr><a name="details"></a><h2>Detailed Description</h2>
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The QImageConsumer class is an abstraction used by <a href="qimagedecoder.html">QImageDecoder</a>.
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<p>
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<p> The <a href="qmovie.html">QMovie</a> class, or <a href="qlabel.html#setMovie">QLabel::setMovie</a>(), are easy to use and for
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most situations do what you want with regards animated images.
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<p> A QImageConsumer consumes information about changes to the <a href="qimage.html">QImage</a>
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maintained by a QImageDecoder. Think of the QImage as the model or
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source of the image data, with the QImageConsumer as a view of
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that data and the QImageDecoder being the controller that
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orchestrates the relationship between the model and the view.
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<p> You'd use the QImageConsumer class, for example, if you were
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implementing a web browser with your own image loaders.
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<p> <p>See also <a href="qimagedecoder.html">QImageDecoder</a>, <a href="graphics.html">Graphics Classes</a>, <a href="images.html">Image Processing Classes</a>, and <a href="multimedia.html">Multimedia Classes</a>.
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<hr><h2>Member Function Documentation</h2>
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<h3 class=fn>void <a name="changed"></a>QImageConsumer::changed ( const <a href="qrect.html">QRect</a> & )<tt> [pure virtual]</tt>
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</h3>
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<p> Called when the given area of the image has changed.
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<h3 class=fn>void <a name="end"></a>QImageConsumer::end ()<tt> [pure virtual]</tt>
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</h3>
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<p> Called when all the data from all the frames has been decoded and
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revealed as <a href="#changed">changed</a>().
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<h3 class=fn>void <a name="frameDone"></a>QImageConsumer::frameDone ()<tt> [pure virtual]</tt>
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</h3>
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<p> One of the two <a href="#frameDone">frameDone</a>() functions will be called when a frame
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of an animated image has ended and been revealed as <a href="#changed">changed</a>().
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<p> When this function is called, the current image should be
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displayed.
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<p> The decoder will not make any further changes to the image until
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the next call to <a href="qimageformat.html#decode">QImageFormat::decode</a>().
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<h3 class=fn>void <a name="frameDone-2"></a>QImageConsumer::frameDone ( const <a href="qpoint.html">QPoint</a> & offset, const <a href="qrect.html">QRect</a> & rect )<tt> [pure virtual]</tt>
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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> One of the two <a href="#frameDone">frameDone</a>() functions will be called when a frame
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of an animated image has ended and been revealed as <a href="#changed">changed</a>().
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<p> When this function is called, the area <em>rect</em> in the current
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image should be moved by <em>offset</em> and displayed.
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<p> The decoder will not make any further changes to the image until
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the next call to <a href="qimageformat.html#decode">QImageFormat::decode</a>().
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<h3 class=fn>void <a name="setFramePeriod"></a>QImageConsumer::setFramePeriod ( int milliseconds )<tt> [pure virtual]</tt>
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</h3>
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<p> Notes that the frame about to be decoded should not be displayed
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until the given number of <em>milliseconds</em> after the time that this
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function is called. Of course, the image may not have been
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decoded by then, in which case the frame should not be displayed
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until it is complete. A value of -1 (the assumed default)
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indicates that the image should be displayed even while it is only
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partially loaded.
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<h3 class=fn>void <a name="setLooping"></a>QImageConsumer::setLooping ( int n )<tt> [pure virtual]</tt>
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</h3>
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<p> Called to indicate that the sequence of frames in the image
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should be repeated <em>n</em> times, including the sequence during
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decoding.
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<p> <ul>
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<li> 0 = Forever
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<li> 1 = Only display frames the first time through
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<li> 2 = Repeat once after first pass through images
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<li> etc.
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</ul>
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<p> To make the <a href="qimagedecoder.html">QImageDecoder</a> do this, just delete it and pass the
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information to it again for decoding (<a href="#setLooping">setLooping</a>() will be called
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again, of course, but that can be ignored), or keep copies of the
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changed areas at the ends of frames.
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<h3 class=fn>void <a name="setSize"></a>QImageConsumer::setSize ( int, int )<tt> [pure virtual]</tt>
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</h3>
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<p> This function is called as soon as the size of the image has been
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determined.
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<!-- eof -->
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<hr><p>
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This file is part of the <a href="index.html">Qt toolkit</a>.
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Copyright © 1995-2007
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<a href="http://www.trolltech.com/">Trolltech</a>. All Rights Reserved.<p><address><hr><div align=center>
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<table width=100% cellspacing=0 border=0><tr>
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<td>Copyright © 2007
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<a href="troll.html">Trolltech</a><td align=center><a href="trademarks.html">Trademarks</a>
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<td align=right><div align=right>Qt 3.3.8</div>
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</table></div></address></body>
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</html>
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