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221 lines
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221 lines
12 KiB
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<!-- /home/espenr/tmp/qt-3.3.8-espenr-2499/qt-x11-free-3.3.8/src/kernel/qdragobject.cpp:571 -->
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<title>TQDragObject 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>TQDragObject Class Reference</h1>
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<p>The TQDragObject class encapsulates MIME-based data
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transfer.
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<a href="#details">More...</a>
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<p><tt>#include <<a href="qdragobject-h.html">ntqdragobject.h</a>></tt>
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<p>Inherits <a href="tqobject.html">TQObject</a> and <a href="qmimesource.html">TQMimeSource</a>.
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<p>Inherited by <a href="qstoreddrag.html">TQStoredDrag</a>, <a href="qtextdrag.html">TQTextDrag</a>, <a href="qimagedrag.html">TQImageDrag</a>, and <a href="qicondrag.html">TQIconDrag</a>.
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<p><a href="qdragobject-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="#TQDragObject"><b>TQDragObject</b></a> ( TQWidget * dragSource = 0, const char * name = 0 )</li>
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<li class=fn>virtual <a href="#~TQDragObject"><b>~TQDragObject</b></a> ()</li>
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<li class=fn>bool <a href="#drag"><b>drag</b></a> ()</li>
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<li class=fn>bool <a href="#dragMove"><b>dragMove</b></a> ()</li>
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<li class=fn>void <a href="#dragCopy"><b>dragCopy</b></a> ()</li>
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<li class=fn>void <a href="#dragLink"><b>dragLink</b></a> ()</li>
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<li class=fn>virtual void <a href="#setPixmap-2"><b>setPixmap</b></a> ( TQPixmap pm )</li>
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<li class=fn>virtual void <a href="#setPixmap"><b>setPixmap</b></a> ( TQPixmap pm, const TQPoint & hotspot )</li>
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<li class=fn>TQPixmap <a href="#pixmap"><b>pixmap</b></a> () const</li>
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<li class=fn>TQPoint <a href="#pixmapHotSpot"><b>pixmapHotSpot</b></a> () const</li>
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<li class=fn>TQWidget * <a href="#source"><b>source</b></a> ()</li>
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<li class=fn>enum <a href="#DragMode-enum"><b>DragMode</b></a> { DragDefault, DragCopy, DragMove, DragLink, DragCopyOrMove }</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>TQWidget * <a href="#target"><b>target</b></a> ()</li>
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</ul>
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<h2>Protected Members</h2>
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<ul>
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<li class=fn>virtual bool <a href="#drag-2"><b>drag</b></a> ( DragMode mode )</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 TQDragObject class encapsulates MIME-based data
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transfer.
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<p>
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<p> TQDragObject is the base class for all data that needs to be
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transferred between and within applications, both for drag and
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drop and for the <a href="ntqclipboard.html">clipboard</a>.
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<p> See the <a href="dnd.html">Drag-and-drop documentation</a> for an
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overview of how to provide drag and drop in your application.
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<p> See the <a href="ntqclipboard.html">TQClipboard</a> documentation for an overview of how to provide
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cut-and-paste in your application.
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<p> The <a href="#drag">drag</a>() function is used to start a drag operation. You can
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specify the <a href="#DragMode-enum">DragMode</a> in the call or use one of the convenience
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functions <a href="#dragCopy">dragCopy</a>(), <a href="#dragMove">dragMove</a>() or <a href="#dragLink">dragLink</a>(). The drag source
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where the data originated is retrieved with <a href="#source">source</a>(). If the data
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was dropped on a widget within the application, <a href="#target">target</a>() will
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return a pointer to that widget. Specify the pixmap to display
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during the drag with <a href="#setPixmap">setPixmap</a>().
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<p>See also <a href="draganddrop.html">Drag And Drop Classes</a>.
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<hr><h2>Member Type Documentation</h2>
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<h3 class=fn><a name="DragMode-enum"></a>TQDragObject::DragMode</h3>
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<p> This enum describes the possible drag modes.
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<ul>
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<li><tt>TQDragObject::DragDefault</tt> - The mode is determined heuristically.
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<li><tt>TQDragObject::DragCopy</tt> - The data is copied, never moved.
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<li><tt>TQDragObject::DragMove</tt> - The data is moved, if dragged at all.
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<li><tt>TQDragObject::DragLink</tt> - The data is linked, if dragged at all.
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<li><tt>TQDragObject::DragCopyOrMove</tt> - The user chooses the mode by using a
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control key to switch from the default.
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</ul>
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<hr><h2>Member Function Documentation</h2>
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<h3 class=fn><a name="TQDragObject"></a>TQDragObject::TQDragObject ( <a href="tqwidget.html">TQWidget</a> * dragSource = 0, 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
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deleted.
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<h3 class=fn><a name="~TQDragObject"></a>TQDragObject::~TQDragObject ()<tt> [virtual]</tt>
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</h3>
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Destroys the drag object, canceling any drag and drop operation in
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which it is involved, and frees up the storage used.
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<h3 class=fn>bool <a name="drag"></a>TQDragObject::drag ()
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</h3>
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Starts a drag operation using the contents of this object, using
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DragDefault mode.
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<p> The function returns TRUE if the caller should delete the original
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copy of the dragged data (but see <a href="#target">target</a>()); otherwise returns
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FALSE.
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<p> If the drag contains <em>references</em> to information (e.g. file names
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in a <a href="quridrag.html">TQUriDrag</a> are references) then the return value should always
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be ignored, as the target is expected to manipulate the
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referred-to content directly. On X11 the return value should
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always be correct anyway, but on Windows this is not necessarily
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the case (e.g. the file manager starts a background process to
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move files, so the source <em>must not</em> delete the files!)
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<p> Note that on Windows the drag operation will spin a blocking modal
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event loop that will not dispatch any TQTimers.
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<p>Example: <a href="dirview-example.html#x1670">dirview/dirview.cpp</a>.
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<h3 class=fn>bool <a name="drag-2"></a>TQDragObject::drag ( <a href="ntqdragobject.html#DragMode-enum">DragMode</a> mode )<tt> [virtual protected]</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> Starts a drag operation using the contents of this object.
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<p> At this point, the object becomes owned by TQt, not the
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application. You should not delete the drag object or anything it
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references. The actual transfer of data to the target application
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will be done during future event processing - after that time the
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drag object will be deleted.
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<p> Returns TRUE if the dragged data was dragged as a <em>move</em>,
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indicating that the caller should remove the original source of
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the data (the drag object must continue to have a copy); otherwise
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returns FALSE.
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<p> The <em>mode</em> specifies the drag mode (see
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<a href="#DragMode-enum">TQDragObject::DragMode</a>.) Normally one of the simpler <a href="#drag">drag</a>(),
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<a href="#dragMove">dragMove</a>(), or <a href="#dragCopy">dragCopy</a>() functions would be used instead.
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<h3 class=fn>void <a name="dragCopy"></a>TQDragObject::dragCopy ()
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</h3>
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Starts a drag operation using the contents of this object, using
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<a href="#DragMode-enum">DragCopy</a> mode. Be sure to read the constraints described in
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<a href="#drag">drag</a>().
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<p> <p>See also <a href="#drag">drag</a>(), <a href="#dragMove">dragMove</a>(), and <a href="#dragLink">dragLink</a>().
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<p>Example: <a href="simple_dd-example.html#x2818">iconview/simple_dd/main.cpp</a>.
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<h3 class=fn>void <a name="dragLink"></a>TQDragObject::dragLink ()
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</h3>
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Starts a drag operation using the contents of this object, using
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<a href="#DragMode-enum">DragLink</a> mode. Be sure to read the constraints described in
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<a href="#drag">drag</a>().
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<p> <p>See also <a href="#drag">drag</a>(), <a href="#dragCopy">dragCopy</a>(), and <a href="#dragMove">dragMove</a>().
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<h3 class=fn>bool <a name="dragMove"></a>TQDragObject::dragMove ()
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</h3>
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Starts a drag operation using the contents of this object, using
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<a href="#DragMode-enum">DragMove</a> mode. Be sure to read the constraints described in
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<a href="#drag">drag</a>().
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<p> <p>See also <a href="#drag">drag</a>(), <a href="#dragCopy">dragCopy</a>(), and <a href="#dragLink">dragLink</a>().
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<h3 class=fn><a href="ntqpixmap.html">TQPixmap</a> <a name="pixmap"></a>TQDragObject::pixmap () const
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</h3>
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Returns the currently set pixmap (which <a href="ntqpixmap.html#isNull">isNull()</a> if none is set).
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<h3 class=fn><a href="ntqpoint.html">TQPoint</a> <a name="pixmapHotSpot"></a>TQDragObject::pixmapHotSpot () const
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</h3>
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Returns the currently set pixmap hotspot.
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<h3 class=fn>void <a name="setPixmap"></a>TQDragObject::setPixmap ( <a href="ntqpixmap.html">TQPixmap</a> pm, const <a href="ntqpoint.html">TQPoint</a> & hotspot )<tt> [virtual]</tt>
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</h3>
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Set the pixmap <em>pm</em> to display while dragging the object. The
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platform-specific implementation will use this where it can - so
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provide a small masked pixmap, and do not assume that the user
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will actually see it. For example, cursors on Windows 95 are of
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limited size.
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<p> The <em>hotspot</em> is the point on (or off) the pixmap that should be
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under the cursor as it is dragged. It is relative to the top-left
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pixel of the pixmap.
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<p> <b>Warning:</b> We have seen problems with drag cursors on different
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graphics hardware and driver software on Windows. Setting the
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graphics acceleration in the display settings down one tick solved
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the problems in all cases.
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<p>Example: <a href="fileiconview-example.html#x815">fileiconview/qfileiconview.cpp</a>.
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<h3 class=fn>void <a name="setPixmap-2"></a>TQDragObject::setPixmap ( <a href="ntqpixmap.html">TQPixmap</a> pm )<tt> [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> Uses a hotspot that positions the pixmap below and to the right of
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the mouse pointer. This allows the user to clearly see the point
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on the window which they are dragging the data onto.
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<h3 class=fn><a href="tqwidget.html">TQWidget</a> * <a name="source"></a>TQDragObject::source ()
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</h3>
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Returns a pointer to the drag source where this object originated.
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<h3 class=fn><a href="tqwidget.html">TQWidget</a> * <a name="target"></a>TQDragObject::target ()<tt> [static]</tt>
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</h3>
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After the drag completes, this function will return the <a href="tqwidget.html">TQWidget</a>
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which received the drop, or 0 if the data was dropped on another
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application.
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<p> This can be useful for detecting the case where drag and drop is
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to and from the same widget.
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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">TQt 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>TQt 3.3.8</div>
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