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226 lines
11 KiB
226 lines
11 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/qdnd_x11.cpp:1565 -->
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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>QDropEvent Class</title>
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<font color="#004faf">All Classes</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>QDropEvent Class Reference</h1>
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<p>The QDropEvent class provides an event which is sent when a drag and drop is completed.
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<a href="#details">More...</a>
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<p><tt>#include <<a href="qevent-h.html">qevent.h</a>></tt>
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<p>Inherits <a href="qevent.html">QEvent</a> and <a href="qmimesource.html">QMimeSource</a>.
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<p>Inherited by <a href="qdragmoveevent.html">QDragMoveEvent</a>.
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<p><a href="qdropevent-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="#QDropEvent"><b>QDropEvent</b></a> ( const QPoint & pos, Type typ = Drop )</li>
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<li class=fn>const QPoint & <a href="#pos"><b>pos</b></a> () const</li>
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<li class=fn>bool <a href="#isAccepted"><b>isAccepted</b></a> () const</li>
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<li class=fn>void <a href="#accept"><b>accept</b></a> ( bool y = TRUE )</li>
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<li class=fn>void <a href="#ignore"><b>ignore</b></a> ()</li>
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<li class=fn>bool <a href="#isActionAccepted"><b>isActionAccepted</b></a> () const</li>
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<li class=fn>void <a href="#acceptAction"><b>acceptAction</b></a> ( bool y = TRUE )</li>
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<li class=fn>enum <a href="#Action-enum"><b>Action</b></a> { Copy, Link, Move, Private, UserAction = 100 }</li>
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<li class=fn>void <a href="#setAction"><b>setAction</b></a> ( Action a )</li>
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<li class=fn>Action <a href="#action"><b>action</b></a> () const</li>
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<li class=fn>QWidget * <a href="#source"><b>source</b></a> () const</li>
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<li class=fn>virtual const char * <a href="#format"><b>format</b></a> ( int n = 0 ) const</li>
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<li class=fn>virtual QByteArray <a href="#encodedData"><b>encodedData</b></a> ( const char * format ) const</li>
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<li class=fn>virtual bool <a href="#provides"><b>provides</b></a> ( const char * mimeType ) const</li>
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<li class=fn>QByteArray data ( const char * f ) const <em>(obsolete)</em></li>
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<li class=fn>void <a href="#setPoint"><b>setPoint</b></a> ( const QPoint & np )</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 QDropEvent class provides an event which is sent when a drag and drop is completed.
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<p> When a widget <a href="qwidget.html#setAcceptDrops">accepts drop
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events</a>, it will receive this event if it has accepted the
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most recent <a href="qdragenterevent.html">QDragEnterEvent</a> or <a href="qdragmoveevent.html">QDragMoveEvent</a> sent to it.
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<p> The widget should use <a href="#data">data</a>() to extract the data in an appropriate
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format.
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<p>See also <a href="draganddrop.html">Drag And Drop Classes</a> and <a href="events.html">Event Classes</a>.
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<hr><h2>Member Type Documentation</h2>
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<h3 class=fn><a name="Action-enum"></a>QDropEvent::Action</h3>
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<p> This enum describes the action which a source requests that a
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target perform with dropped data.
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<ul>
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<li><tt>QDropEvent::Copy</tt> - The default action. The source simply uses the data
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provided in the operation.
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<li><tt>QDropEvent::Link</tt> - The source should somehow create a link to the
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location specified by the data.
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<li><tt>QDropEvent::Move</tt> - The source should somehow move the object from the
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location specified by the data to a new location.
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<li><tt>QDropEvent::Private</tt> - The target has special knowledge of the MIME type,
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which the source should respond to in a similar way to
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a Copy.
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<li><tt>QDropEvent::UserAction</tt> - The source and target can co-operate using
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special actions. This feature is not currently
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supported.
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</ul><p> The Link and Move actions only makes sense if the data is a
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reference, for example, text/uri-list file lists (see <a href="quridrag.html">QUriDrag</a>).
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<hr><h2>Member Function Documentation</h2>
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<h3 class=fn><a name="QDropEvent"></a>QDropEvent::QDropEvent ( const <a href="qpoint.html">QPoint</a> & pos, <a href="qevent.html#Type-enum">Type</a> typ = Drop )
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</h3>
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<p> Constructs a drop event that drops a drop of type <em>typ</em> on point
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<em>pos</em>.
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<h3 class=fn>void <a name="accept"></a>QDropEvent::accept ( bool y = TRUE )
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</h3>
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<p> Call this function to indicate whether the event provided data
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which your widget processed. Set <em>y</em> to TRUE (the default) if
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your widget could process the data, otherwise set <em>y</em> to FALSE.
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To get the data, use <a href="#encodedData">encodedData</a>(), or preferably, the decode()
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methods of existing <a href="qdragobject.html">QDragObject</a> subclasses, such as
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<a href="qtextdrag.html#decode">QTextDrag::decode</a>(), or your own subclasses.
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<p> <p>See also <a href="#acceptAction">acceptAction</a>().
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<p>Example: <a href="simple_dd-example.html#x2819">iconview/simple_dd/main.cpp</a>.
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<h3 class=fn>void <a name="acceptAction"></a>QDropEvent::acceptAction ( bool y = TRUE )
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</h3>
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<p> Call this to indicate that the action described by <a href="#action">action</a>() is
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accepted (i.e. if <em>y</em> is TRUE, which is the default), not merely
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the default copy action. If you call <a href="#acceptAction">acceptAction</a>(TRUE), there is
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no need to also call <a href="#accept">accept</a>(TRUE).
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<p>Examples: <a href="dirview-example.html#x1671">dirview/dirview.cpp</a> and <a href="fileiconview-example.html#x816">fileiconview/qfileiconview.cpp</a>.
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<h3 class=fn><a href="qdropevent.html#Action-enum">Action</a> <a name="action"></a>QDropEvent::action () const
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</h3>
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<p> Returns the Action which the target is requesting to be performed
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with the data. If your application understands the action and can
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process the supplied data, call <a href="#acceptAction">acceptAction</a>(); if your
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application can process the supplied data but can only perform the
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Copy action, call <a href="#accept">accept</a>().
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<p>Examples: <a href="dirview-example.html#x1672">dirview/dirview.cpp</a> and <a href="fileiconview-example.html#x817">fileiconview/qfileiconview.cpp</a>.
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<h3 class=fn><a href="qbytearray.html">QByteArray</a> <a name="data"></a>QDropEvent::data ( const char * f ) const
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</h3>
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<p> <b>This function is obsolete.</b> It is provided to keep old source working. We strongly advise against using it in new code.
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<p> Use <a href="#encodedData">QDropEvent::encodedData</a>().
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<h3 class=fn><a href="qbytearray.html">QByteArray</a> <a name="encodedData"></a>QDropEvent::encodedData ( const char * format ) const<tt> [virtual]</tt>
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</h3>
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Returns a byte array containing the drag's data, in <em>format</em>.
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<p> <a href="#data">data</a>() normally needs to get the data from the drag source, which
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is potentially very slow, so it's advisable to call this function
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only if you're sure that you will need the data in <em>format</em>.
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<p> The resulting data will have a size of 0 if the format was not
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available.
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<p> <p>See also <a href="#format">format</a>() and <a href="qmemarray.html#size">QByteArray::size</a>().
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<p>Reimplemented from <a href="qmimesource.html#encodedData">QMimeSource</a>.
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<h3 class=fn>const char * <a name="format"></a>QDropEvent::format ( int n = 0 ) const<tt> [virtual]</tt>
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</h3>
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Returns a string describing one of the available data types for
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this drag. Common examples are "text/plain" and "image/gif". If <em>n</em> is less than zero or greater than the number of available data
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types, <a href="#format">format</a>() returns 0.
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<p> This function is provided mainly for debugging. Most drop targets
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will use <a href="#provides">provides</a>().
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<p> <p>See also <a href="#data">data</a>() and <a href="#provides">provides</a>().
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<p>Example: <a href="iconview-example.html#x1454">iconview/main.cpp</a>.
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<p>Reimplemented from <a href="qmimesource.html#format">QMimeSource</a>.
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<h3 class=fn>void <a name="ignore"></a>QDropEvent::ignore ()
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</h3>
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<p> The opposite of <a href="#accept">accept</a>(), i.e. you have ignored the drop event.
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<p>Example: <a href="fileiconview-example.html#x818">fileiconview/qfileiconview.cpp</a>.
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<h3 class=fn>bool <a name="isAccepted"></a>QDropEvent::isAccepted () const
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</h3>
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<p> Returns TRUE if the drop target accepts the event; otherwise
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returns FALSE.
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<h3 class=fn>bool <a name="isActionAccepted"></a>QDropEvent::isActionAccepted () const
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</h3>
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<p> Returns TRUE if the drop action was accepted by the drop site;
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otherwise returns FALSE.
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<h3 class=fn>const <a href="qpoint.html">QPoint</a> & <a name="pos"></a>QDropEvent::pos () const
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</h3>
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<p> Returns the position where the drop was made.
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<p>Example: <a href="dirview-example.html#x1673">dirview/dirview.cpp</a>.
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<h3 class=fn>bool <a name="provides"></a>QDropEvent::provides ( const char * mimeType ) const<tt> [virtual]</tt>
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</h3>
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Returns TRUE if this event provides format <em>mimeType</em>; otherwise
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returns FALSE.
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<p> <p>See also <a href="#data">data</a>().
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<p>Example: <a href="fileiconview-example.html#x819">fileiconview/qfileiconview.cpp</a>.
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<p>Reimplemented from <a href="qmimesource.html#provides">QMimeSource</a>.
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<h3 class=fn>void <a name="setAction"></a>QDropEvent::setAction ( <a href="qdropevent.html#Action-enum">Action</a> a )
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</h3>
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<p> Sets the action to <em>a</em>. This is used internally, you should not
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need to call this in your code: the <em>source</em> decides the action,
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not the target.
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<h3 class=fn>void <a name="setPoint"></a>QDropEvent::setPoint ( const <a href="qpoint.html">QPoint</a> & np )
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</h3>
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<p> Sets the drop to happen at point <em>np</em>. You do not normally need
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to use this as it will be set internally before your widget
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receives the drop event.
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<h3 class=fn><a href="qwidget.html">QWidget</a> * <a name="source"></a>QDropEvent::source () const
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</h3>
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If the source of the drag operation is a widget in this
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application, this function returns that source, otherwise it
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returns 0. The source of the operation is the first parameter to
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drag object subclasses.
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<p> This is useful if your widget needs special behavior when dragging
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to itself, etc.
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<p> See <a href="qdragobject.html#QDragObject">QDragObject::QDragObject</a>() and subclasses.
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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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