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| 6 | <title>QImageConsumer Class</title>
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| 20 | <font color="#004faf">Home</font></a>
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| 24 | <font color="#004faf">Main Classes</font></a>
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| 31 | </td>
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| 32 | <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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| 33 |
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| 34 | <p>The QImageConsumer class is an abstraction used by QImageDecoder.
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| 35 | <a href="#details">More...</a>
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| 36 | <p><tt>#include <<a href="qasyncimageio-h.html">qasyncimageio.h</a>></tt>
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| 37 | <p><a href="qimageconsumer-members.html">List of all member functions.</a>
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| 38 | <h2>Public Members</h2>
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| 39 | <ul>
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| 40 | <li class=fn>virtual void <a href="#end"><b>end</b></a> () = 0</li>
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| 41 | <li class=fn>virtual void <a href="#changed"><b>changed</b></a> ( const QRect & ) = 0</li>
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| 42 | <li class=fn>virtual void <a href="#frameDone"><b>frameDone</b></a> () = 0</li>
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| 43 | <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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| 44 | <li class=fn>virtual void <a href="#setLooping"><b>setLooping</b></a> ( int n ) = 0</li>
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| 45 | <li class=fn>virtual void <a href="#setFramePeriod"><b>setFramePeriod</b></a> ( int milliseconds ) = 0</li>
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| 46 | <li class=fn>virtual void <a href="#setSize"><b>setSize</b></a> ( int, int ) = 0</li>
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| 47 | </ul>
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| 48 | <hr><a name="details"></a><h2>Detailed Description</h2>
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| 49 |
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| 50 |
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| 51 | The QImageConsumer class is an abstraction used by <a href="qimagedecoder.html">QImageDecoder</a>.
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| 52 | <p>
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| 53 |
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| 54 |
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| 55 | <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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| 56 | most situations do what you want with regards animated images.
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| 57 | <p> A QImageConsumer consumes information about changes to the <a href="qimage.html">QImage</a>
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| 58 | maintained by a QImageDecoder. Think of the QImage as the model or
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| 59 | source of the image data, with the QImageConsumer as a view of
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| 60 | that data and the QImageDecoder being the controller that
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| 61 | orchestrates the relationship between the model and the view.
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| 62 | <p> You'd use the QImageConsumer class, for example, if you were
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| 63 | implementing a web browser with your own image loaders.
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| 64 | <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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| 65 |
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| 66 | <hr><h2>Member Function Documentation</h2>
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| 67 | <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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| 68 | </h3>
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| 69 |
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| 70 | <p> Called when the given area of the image has changed.
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| 71 |
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| 72 | <h3 class=fn>void <a name="end"></a>QImageConsumer::end ()<tt> [pure virtual]</tt>
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| 73 | </h3>
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| 74 |
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| 75 | <p> Called when all the data from all the frames has been decoded and
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| 76 | revealed as <a href="#changed">changed</a>().
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| 77 |
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| 78 | <h3 class=fn>void <a name="frameDone"></a>QImageConsumer::frameDone ()<tt> [pure virtual]</tt>
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| 79 | </h3>
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| 80 |
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| 81 | <p> One of the two <a href="#frameDone">frameDone</a>() functions will be called when a frame
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| 82 | of an animated image has ended and been revealed as <a href="#changed">changed</a>().
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| 83 | <p> When this function is called, the current image should be
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| 84 | displayed.
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| 85 | <p> The decoder will not make any further changes to the image until
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| 86 | the next call to <a href="qimageformat.html#decode">QImageFormat::decode</a>().
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| 87 |
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| 88 | <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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| 89 | </h3>
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| 90 | This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
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| 91 | <p> One of the two <a href="#frameDone">frameDone</a>() functions will be called when a frame
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| 92 | of an animated image has ended and been revealed as <a href="#changed">changed</a>().
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| 93 | <p> When this function is called, the area <em>rect</em> in the current
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| 94 | image should be moved by <em>offset</em> and displayed.
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| 95 | <p> The decoder will not make any further changes to the image until
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| 96 | the next call to <a href="qimageformat.html#decode">QImageFormat::decode</a>().
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| 97 |
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| 98 | <h3 class=fn>void <a name="setFramePeriod"></a>QImageConsumer::setFramePeriod ( int milliseconds )<tt> [pure virtual]</tt>
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| 99 | </h3>
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| 100 |
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| 101 | <p> Notes that the frame about to be decoded should not be displayed
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| 102 | until the given number of <em>milliseconds</em> after the time that this
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| 103 | function is called. Of course, the image may not have been
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| 104 | decoded by then, in which case the frame should not be displayed
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| 105 | until it is complete. A value of -1 (the assumed default)
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| 106 | indicates that the image should be displayed even while it is only
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| 107 | partially loaded.
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| 108 |
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| 109 | <h3 class=fn>void <a name="setLooping"></a>QImageConsumer::setLooping ( int n )<tt> [pure virtual]</tt>
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| 110 | </h3>
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| 111 |
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| 112 | <p> Called to indicate that the sequence of frames in the image
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| 113 | should be repeated <em>n</em> times, including the sequence during
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| 114 | decoding.
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| 115 | <p> <ul>
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| 116 | <li> 0 = Forever
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| 117 | <li> 1 = Only display frames the first time through
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| 118 | <li> 2 = Repeat once after first pass through images
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| 119 | <li> etc.
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| 120 | </ul>
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| 121 | <p> To make the <a href="qimagedecoder.html">QImageDecoder</a> do this, just delete it and pass the
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| 122 | information to it again for decoding (<a href="#setLooping">setLooping</a>() will be called
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| 123 | again, of course, but that can be ignored), or keep copies of the
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| 124 | changed areas at the ends of frames.
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| 125 |
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| 126 | <h3 class=fn>void <a name="setSize"></a>QImageConsumer::setSize ( int, int )<tt> [pure virtual]</tt>
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| 127 | </h3>
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| 128 |
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| 129 | <p> This function is called as soon as the size of the image has been
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| 130 | determined.
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| 131 |
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| 132 | <!-- eof -->
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| 133 | <hr><p>
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| 134 | This file is part of the <a href="index.html">Qt toolkit</a>.
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| 135 | Copyright © 1995-2007
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| 136 | <a href="http://www.trolltech.com/">Trolltech</a>. All Rights Reserved.<p><address><hr><div align=center>
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| 137 | <table width=100% cellspacing=0 border=0><tr>
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| 138 | <td>Copyright © 2007
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| 139 | <a href="troll.html">Trolltech</a><td align=center><a href="trademarks.html">Trademarks</a>
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| 140 | <td align=right><div align=right>Qt 3.3.8</div>
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| 141 | </table></div></address></body>
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| 142 | </html>
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