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| author | Timothy Pearson <kb9vqf@pearsoncomputing.net> | 2011-07-10 15:24:15 -0500 |
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| committer | Timothy Pearson <kb9vqf@pearsoncomputing.net> | 2011-07-10 15:24:15 -0500 |
| commit | bd0f3345a938b35ce6a12f6150373b0955b8dd12 (patch) | |
| tree | 7a520322212d48ebcb9fbe1087e7fca28b76185c /doc/html/qdragobject.html | |
| download | qt3-bd0f3345a938b35ce6a12f6150373b0955b8dd12.tar.gz qt3-bd0f3345a938b35ce6a12f6150373b0955b8dd12.zip | |
Add Qt3 development HEAD version
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| -rw-r--r-- | doc/html/qdragobject.html | 220 |
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diff --git a/doc/html/qdragobject.html b/doc/html/qdragobject.html new file mode 100644 index 0000000..70ca2f9 --- /dev/null +++ b/doc/html/qdragobject.html @@ -0,0 +1,220 @@ +<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> +<!-- /home/espenr/tmp/qt-3.3.8-espenr-2499/qt-x11-free-3.3.8/src/kernel/qdragobject.cpp:571 --> +<html> +<head> +<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"> +<title>QDragObject Class</title> +<style type="text/css"><!-- +fn { margin-left: 1cm; text-indent: -1cm; } +a:link { color: #004faf; text-decoration: none } +a:visited { color: #672967; text-decoration: none } +body { background: #ffffff; color: black; } +--></style> +</head> +<body> + +<table border="0" cellpadding="0" cellspacing="0" width="100%"> +<tr bgcolor="#E5E5E5"> +<td valign=center> + <a href="index.html"> +<font color="#004faf">Home</font></a> + | <a href="classes.html"> +<font color="#004faf">All Classes</font></a> + | <a href="mainclasses.html"> +<font color="#004faf">Main Classes</font></a> + | <a href="annotated.html"> +<font color="#004faf">Annotated</font></a> + | <a href="groups.html"> +<font color="#004faf">Grouped Classes</font></a> + | <a href="functions.html"> +<font color="#004faf">Functions</font></a> +</td> +<td align="right" valign="center"><img src="logo32.png" align="right" width="64" height="32" border="0"></td></tr></table><h1 align=center>QDragObject Class Reference</h1> + +<p>The QDragObject class encapsulates MIME-based data +transfer. +<a href="#details">More...</a> +<p><tt>#include <<a href="qdragobject-h.html">qdragobject.h</a>></tt> +<p>Inherits <a href="qobject.html">QObject</a> and <a href="qmimesource.html">QMimeSource</a>. +<p>Inherited by <a href="qstoreddrag.html">QStoredDrag</a>, <a href="qtextdrag.html">QTextDrag</a>, <a href="qimagedrag.html">QImageDrag</a>, and <a href="qicondrag.html">QIconDrag</a>. +<p><a href="qdragobject-members.html">List of all member functions.</a> +<h2>Public Members</h2> +<ul> +<li class=fn><a href="#QDragObject"><b>QDragObject</b></a> ( QWidget * dragSource = 0, const char * name = 0 )</li> +<li class=fn>virtual <a href="#~QDragObject"><b>~QDragObject</b></a> ()</li> +<li class=fn>bool <a href="#drag"><b>drag</b></a> ()</li> +<li class=fn>bool <a href="#dragMove"><b>dragMove</b></a> ()</li> +<li class=fn>void <a href="#dragCopy"><b>dragCopy</b></a> ()</li> +<li class=fn>void <a href="#dragLink"><b>dragLink</b></a> ()</li> +<li class=fn>virtual void <a href="#setPixmap-2"><b>setPixmap</b></a> ( QPixmap pm )</li> +<li class=fn>virtual void <a href="#setPixmap"><b>setPixmap</b></a> ( QPixmap pm, const QPoint & hotspot )</li> +<li class=fn>QPixmap <a href="#pixmap"><b>pixmap</b></a> () const</li> +<li class=fn>QPoint <a href="#pixmapHotSpot"><b>pixmapHotSpot</b></a> () const</li> +<li class=fn>QWidget * <a href="#source"><b>source</b></a> ()</li> +<li class=fn>enum <a href="#DragMode-enum"><b>DragMode</b></a> { DragDefault, DragCopy, DragMove, DragLink, DragCopyOrMove }</li> +</ul> +<h2>Static Public Members</h2> +<ul> +<li class=fn>QWidget * <a href="#target"><b>target</b></a> ()</li> +</ul> +<h2>Protected Members</h2> +<ul> +<li class=fn>virtual bool <a href="#drag-2"><b>drag</b></a> ( DragMode mode )</li> +</ul> +<hr><a name="details"></a><h2>Detailed Description</h2> + + +<p> The QDragObject class encapsulates MIME-based data +transfer. +<p> +<p> QDragObject is the base class for all data that needs to be +transferred between and within applications, both for drag and +drop and for the <a href="qclipboard.html">clipboard</a>. +<p> See the <a href="dnd.html">Drag-and-drop documentation</a> for an +overview of how to provide drag and drop in your application. +<p> See the <a href="qclipboard.html">QClipboard</a> documentation for an overview of how to provide +cut-and-paste in your application. +<p> The <a href="#drag">drag</a>() function is used to start a drag operation. You can +specify the <a href="#DragMode-enum">DragMode</a> in the call or use one of the convenience +functions <a href="#dragCopy">dragCopy</a>(), <a href="#dragMove">dragMove</a>() or <a href="#dragLink">dragLink</a>(). The drag source +where the data originated is retrieved with <a href="#source">source</a>(). If the data +was dropped on a widget within the application, <a href="#target">target</a>() will +return a pointer to that widget. Specify the pixmap to display +during the drag with <a href="#setPixmap">setPixmap</a>(). +<p>See also <a href="draganddrop.html">Drag And Drop Classes</a>. + +<hr><h2>Member Type Documentation</h2> +<h3 class=fn><a name="DragMode-enum"></a>QDragObject::DragMode</h3> + +<p> This enum describes the possible drag modes. +<ul> +<li><tt>QDragObject::DragDefault</tt> - The mode is determined heuristically. +<li><tt>QDragObject::DragCopy</tt> - The data is copied, never moved. +<li><tt>QDragObject::DragMove</tt> - The data is moved, if dragged at all. +<li><tt>QDragObject::DragLink</tt> - The data is linked, if dragged at all. +<li><tt>QDragObject::DragCopyOrMove</tt> - The user chooses the mode by using a +control key to switch from the default. +</ul> +<hr><h2>Member Function Documentation</h2> +<h3 class=fn><a name="QDragObject"></a>QDragObject::QDragObject ( <a href="qwidget.html">QWidget</a> * dragSource = 0, const char * name = 0 ) +</h3> +Constructs a drag object called <em>name</em>, which is a child of <em>dragSource</em>. +<p> Note that the drag object will be deleted when <em>dragSource</em> is +deleted. + +<h3 class=fn><a name="~QDragObject"></a>QDragObject::~QDragObject ()<tt> [virtual]</tt> +</h3> +Destroys the drag object, canceling any drag and drop operation in +which it is involved, and frees up the storage used. + +<h3 class=fn>bool <a name="drag"></a>QDragObject::drag () +</h3> +Starts a drag operation using the contents of this object, using +DragDefault mode. +<p> The function returns TRUE if the caller should delete the original +copy of the dragged data (but see <a href="#target">target</a>()); otherwise returns +FALSE. +<p> If the drag contains <em>references</em> to information (e.g. file names +in a <a href="quridrag.html">QUriDrag</a> are references) then the return value should always +be ignored, as the target is expected to manipulate the +referred-to content directly. On X11 the return value should +always be correct anyway, but on Windows this is not necessarily +the case (e.g. the file manager starts a background process to +move files, so the source <em>must not</em> delete the files!) +<p> Note that on Windows the drag operation will spin a blocking modal +event loop that will not dispatch any QTimers. + +<p>Example: <a href="dirview-example.html#x1670">dirview/dirview.cpp</a>. +<h3 class=fn>bool <a name="drag-2"></a>QDragObject::drag ( <a href="qdragobject.html#DragMode-enum">DragMode</a> mode )<tt> [virtual protected]</tt> +</h3> +This is an overloaded member function, provided for convenience. It behaves essentially like the above function. +<p> Starts a drag operation using the contents of this object. +<p> At this point, the object becomes owned by Qt, not the +application. You should not delete the drag object or anything it +references. The actual transfer of data to the target application +will be done during future event processing - after that time the +drag object will be deleted. +<p> Returns TRUE if the dragged data was dragged as a <em>move</em>, +indicating that the caller should remove the original source of +the data (the drag object must continue to have a copy); otherwise +returns FALSE. +<p> The <em>mode</em> specifies the drag mode (see +<a href="#DragMode-enum">QDragObject::DragMode</a>.) Normally one of the simpler <a href="#drag">drag</a>(), +<a href="#dragMove">dragMove</a>(), or <a href="#dragCopy">dragCopy</a>() functions would be used instead. + +<h3 class=fn>void <a name="dragCopy"></a>QDragObject::dragCopy () +</h3> +Starts a drag operation using the contents of this object, using +<a href="#DragMode-enum">DragCopy</a> mode. Be sure to read the constraints described in +<a href="#drag">drag</a>(). +<p> <p>See also <a href="#drag">drag</a>(), <a href="#dragMove">dragMove</a>(), and <a href="#dragLink">dragLink</a>(). + +<p>Example: <a href="simple_dd-example.html#x2818">iconview/simple_dd/main.cpp</a>. +<h3 class=fn>void <a name="dragLink"></a>QDragObject::dragLink () +</h3> +Starts a drag operation using the contents of this object, using +<a href="#DragMode-enum">DragLink</a> mode. Be sure to read the constraints described in +<a href="#drag">drag</a>(). +<p> <p>See also <a href="#drag">drag</a>(), <a href="#dragCopy">dragCopy</a>(), and <a href="#dragMove">dragMove</a>(). + +<h3 class=fn>bool <a name="dragMove"></a>QDragObject::dragMove () +</h3> +Starts a drag operation using the contents of this object, using +<a href="#DragMode-enum">DragMove</a> mode. Be sure to read the constraints described in +<a href="#drag">drag</a>(). +<p> <p>See also <a href="#drag">drag</a>(), <a href="#dragCopy">dragCopy</a>(), and <a href="#dragLink">dragLink</a>(). + +<h3 class=fn><a href="qpixmap.html">QPixmap</a> <a name="pixmap"></a>QDragObject::pixmap () const +</h3> +Returns the currently set pixmap (which <a href="qpixmap.html#isNull">isNull()</a> if none is set). + +<h3 class=fn><a href="qpoint.html">QPoint</a> <a name="pixmapHotSpot"></a>QDragObject::pixmapHotSpot () const +</h3> +Returns the currently set pixmap hotspot. + +<h3 class=fn>void <a name="setPixmap"></a>QDragObject::setPixmap ( <a href="qpixmap.html">QPixmap</a> pm, const <a href="qpoint.html">QPoint</a> & hotspot )<tt> [virtual]</tt> +</h3> +Set the pixmap <em>pm</em> to display while dragging the object. The +platform-specific implementation will use this where it can - so +provide a small masked pixmap, and do not assume that the user +will actually see it. For example, cursors on Windows 95 are of +limited size. +<p> The <em>hotspot</em> is the point on (or off) the pixmap that should be +under the cursor as it is dragged. It is relative to the top-left +pixel of the pixmap. +<p> <b>Warning:</b> We have seen problems with drag cursors on different +graphics hardware and driver software on Windows. Setting the +graphics acceleration in the display settings down one tick solved +the problems in all cases. + +<p>Example: <a href="fileiconview-example.html#x815">fileiconview/qfileiconview.cpp</a>. +<h3 class=fn>void <a name="setPixmap-2"></a>QDragObject::setPixmap ( <a href="qpixmap.html">QPixmap</a> pm )<tt> [virtual]</tt> +</h3> +This is an overloaded member function, provided for convenience. It behaves essentially like the above function. +<p> Uses a hotspot that positions the pixmap below and to the right of +the mouse pointer. This allows the user to clearly see the point +on the window which they are dragging the data onto. + +<h3 class=fn><a href="qwidget.html">QWidget</a> * <a name="source"></a>QDragObject::source () +</h3> +Returns a pointer to the drag source where this object originated. + +<h3 class=fn><a href="qwidget.html">QWidget</a> * <a name="target"></a>QDragObject::target ()<tt> [static]</tt> +</h3> +After the drag completes, this function will return the <a href="qwidget.html">QWidget</a> +which received the drop, or 0 if the data was dropped on another +application. +<p> This can be useful for detecting the case where drag and drop is +to and from the same widget. + +<!-- eof --> +<hr><p> +This file is part of the <a href="index.html">Qt toolkit</a>. +Copyright © 1995-2007 +<a href="http://www.trolltech.com/">Trolltech</a>. All Rights Reserved.<p><address><hr><div align=center> +<table width=100% cellspacing=0 border=0><tr> +<td>Copyright © 2007 +<a href="troll.html">Trolltech</a><td align=center><a href="trademarks.html">Trademarks</a> +<td align=right><div align=right>Qt 3.3.8</div> +</table></div></address></body> +</html> |