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125 lines
6.4 KiB
125 lines
6.4 KiB
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<title>TQIconDrag 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>TQIconDrag Class Reference<br><small>[<a href="iconview.html">iconview module</a>]</small></h1>
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<p>The TQIconDrag class supports drag and drop operations
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within a TQIconView.
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<a href="#details">More...</a>
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<p><tt>#include <<a href="qiconview-h.html">ntqiconview.h</a>></tt>
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<p>Inherits <a href="ntqdragobject.html">TQDragObject</a>.
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<p><a href="qicondrag-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><a href="#TQIconDrag"><b>TQIconDrag</b></a> ( TQWidget * dragSource, const char * name = 0 )</li>
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<li class=fn>virtual <a href="#~TQIconDrag"><b>~TQIconDrag</b></a> ()</li>
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<li class=fn>void <a href="#append"><b>append</b></a> ( const TQIconDragItem & i, const TQRect & pr, const TQRect & tr )</li>
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<li class=fn>virtual TQByteArray <a href="#encodedData"><b>encodedData</b></a> ( const char * mime ) const</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>bool <a href="#canDecode"><b>canDecode</b></a> ( TQMimeSource * e )</li>
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</ul>
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<hr><a name="details"></a><h2>Detailed Description</h2>
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<p> The TQIconDrag class supports drag and drop operations
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within a <a href="ntqiconview.html">TQIconView</a>.
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<p>
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<p> A TQIconDrag object is used to maintain information about the
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positions of dragged items and the data associated with the
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dragged items. TQIconViews are able to use this information to
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paint the dragged items in the correct positions. Internally
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TQIconDrag stores the data associated with drag items in
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<a href="qicondragitem.html">TQIconDragItem</a> objects.
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<p> If you want to use the extended drag-and-drop functionality of
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TQIconView, create a TQIconDrag object in a reimplementation of
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<a href="ntqiconview.html#dragObject">TQIconView::dragObject</a>(). Then create a TQIconDragItem for each item
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which should be dragged, set the data it represents with
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<a href="qicondragitem.html#setData">TQIconDragItem::setData</a>(), and add each TQIconDragItem to the drag
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object using <a href="#append">append</a>().
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<p> The data in TQIconDragItems is stored in a <a href="qbytearray.html">TQByteArray</a> and is
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mime-typed (see <a href="qmimesource.html">TQMimeSource</a> and the
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<a href="http://doc.trolltech.com/dnd.html">Drag and Drop</a>
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overview). If you want to use your own mime-types derive a class
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from TQIconDrag and reimplement <a href="qmimesource.html#format">format</a>(), <a href="#encodedData">encodedData</a>() and
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<a href="#canDecode">canDecode</a>().
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<p> The fileiconview example program demonstrates the use of the
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TQIconDrag class including subclassing and reimplementing
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dragObject(), format(), encodedData() and canDecode(). See the files
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<tt>qt/examples/fileiconview/qfileiconview.h</tt> and
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<tt>qt/examples/fileiconview/qfileiconview.cpp</tt>.
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<p> <p>See also <a href="qmimesource.html#format">TQMimeSource::format</a>() and <a href="draganddrop.html">Drag And Drop Classes</a>.
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<hr><h2>Member Function Documentation</h2>
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<h3 class=fn><a name="TQIconDrag"></a>TQIconDrag::TQIconDrag ( <a href="ntqwidget.html">TQWidget</a> * dragSource, const char * name = 0 )
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</h3>
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Constructs a drag object called <em>name</em>, which is a child of <em>dragSource</em>.
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<p> Note that the drag object will be deleted when <em>dragSource</em> is deleted.
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<h3 class=fn><a name="~TQIconDrag"></a>TQIconDrag::~TQIconDrag ()<tt> [virtual]</tt>
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</h3>
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Destructor.
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<h3 class=fn>void <a name="append"></a>TQIconDrag::append ( const <a href="qicondragitem.html">TQIconDragItem</a> & i, const <a href="ntqrect.html">TQRect</a> & pr, const <a href="ntqrect.html">TQRect</a> & tr )
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</h3>
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Append the <a href="qicondragitem.html">TQIconDragItem</a>, <em>i</em>, to the TQIconDrag object's list of
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items. You must also supply the geometry of the pixmap, <em>pr</em>, and
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the textual caption, <em>tr</em>.
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<p> <p>See also <a href="qicondragitem.html">TQIconDragItem</a>.
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<p>Example: <a href="fileiconview-example.html#x829">fileiconview/qfileiconview.cpp</a>.
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<h3 class=fn>bool <a name="canDecode"></a>TQIconDrag::canDecode ( <a href="qmimesource.html">TQMimeSource</a> * e )<tt> [static]</tt>
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</h3>
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Returns TRUE if <em>e</em> can be decoded by the TQIconDrag, otherwise
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return FALSE.
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<p>Example: <a href="fileiconview-example.html#x830">fileiconview/qfileiconview.cpp</a>.
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<h3 class=fn><a href="qbytearray.html">TQByteArray</a> <a name="encodedData"></a>TQIconDrag::encodedData ( const char * mime ) const<tt> [virtual]</tt>
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</h3>
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Returns the encoded data of the drag object if <em>mime</em> is
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application/x-qiconlist.
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<p>Example: <a href="fileiconview-example.html#x831">fileiconview/qfileiconview.cpp</a>.
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<p>Reimplemented from <a href="qmimesource.html#encodedData">TQMimeSource</a>.
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