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<HTML><HEAD><TITLE>Drag-and-drop (DND)</TITLE><METANAME="GENERATOR"CONTENT="Modular DocBook HTML Stylesheet Version 1.49"><LINKREL="HOME"TITLE="GTK+ 1.2 Tutorial"HREF="gtk-tut.html"><LINKREL="PREVIOUS"TITLE="Supplying the selection"HREF="sec-supplyingtheselection.html"><LINKREL="NEXT"TITLE="Properties"HREF="sec-draganddropproperties.html"></HEAD></head><body bgcolor="#FFFFFF" marginheight=0 marginwidth=0 width="100%"><table cellspacing=6 border=0 cellpadding=0 width="100%"> <tr> <td bgcolor="#FFFFFF" valign=top nowrap> <centeR><A HREF="/"><img src="/images/gtk-logo-rgb.gif" width=107 height=140 border=0></A> <font face="helvetica,lucidia" color="#000000"><BR><BR><b>GTK+<BR>The GIMP Toolkit</b></center><BR><table width=100% cellspacing=0 cellpadding=2 border=0><tr><td bgcolor="#000000"><table width=100% cellspacing=0 cellpadding=4 border=0><tr><td bgcolor="#AAAAEE" nowrap><B>General</B></td></tr><tr><td bgcolor="#FFFFFF" nowrap><A HREF="/">Introduction</A><BR><A HREF="/screenshots/">Screenshots</A><br><A HREF="/download/">Download</A><br><A HREF="/mailinglists.html">Mailing Lists</A><BR><A HREF="/bindings.html">Language Bindings</A><BR><A HREF="http://gtk.themes.org/">Themes</A><BR><A HREF="/bugs.html">Bug Tracker</A><BR></td></tr></table></td></tr></table><BR> <table width=100% cellspacing=0 cellpadding=2 border=0><tr><td bgcolor="#000000"><table width=100% cellspacing=0 cellpadding=4 border=0><tr><td bgcolor="#AAAAEE" nowrap><B>Documentation</B></td></tr><tr><td bgcolor="#FFFFFF" nowrap><A HREF="/faq/">FAQ</A><br><A HREF="/tutorial/">Tutorial</A><BR><A HREF="/api/">API Reference</A><br><A HREF="/books.html">Published Books</A><BR></td></tr></table></td></tr></table><BR> <table width=100% cellspacing=0 cellpadding=2 border=0><tr><td bgcolor="#000000"><table width=100% cellspacing=0 cellpadding=4 border=0><tr><td bgcolor="#AAAAEE" nowrap><B>Projects</B></td></tr><tr><td bgcolor="#FFFFFF" nowrap><A HREF="http://www.pango.org/">Pango</A><BR><A HREF="http://sources.redhat.com/inti/">Inti</A><BR><A HREF="http://www.gnome.org/">GNOME</A><BR><A HREF="http://user.sgic.fi/~tml/gimp/win32/">GTK+ for Win32</A><br><A HREF="http://people.redhat.com/sopwith/gtkfb/">GtkFB (Framebuffer)</A><br><A HREF="http://www.directfb.org/gtk.xml">GTK+ on DirectFB</A><BR><A HREF="/beos/">GTK+ for BeOS</A></td></tr></table></td></tr></table><BR> <table width=100% cellspacing=0 cellpadding=2 border=0><tr><td bgcolor="#000000"><table width=100% cellspacing=0 cellpadding=4 border=0><tr><td bgcolor="#AAAAEE" nowrap><B><B>Applications</B></B></td></tr><tr><td bgcolor="#FFFFFF" nowrap><A HREF="http://www.gimp.org/">GIMP</A><BR><A HREF="http://www.abiword.org/">Abiword</A><BR><A HREF="http://www.lysator.liu.se/~alla/dia/dia.html">Dia</A><BR><A HREF="http://glade.pn.org/">Glade</A><BR><A HREF="http://www.gnucash.org/">GnuCash</A><BR><A HREF="http://www.gnome.org/projects/gnumeric/">Gnumeric</A><BR><BR><A HREF="http://www.gnome.org/applist/">GNOME Software Map</A><br></td></tr></table></td></tr></table><BR> </td> <td bgcolor="#ffffff" valign=top width="99%"><font face="lucida,helvetica"><BODYCLASS="CHAPTER"BGCOLOR="#FFFFFF"TEXT="#000000"LINK="#0000FF"VLINK="#840084"ALINK="#0000FF"><DIVCLASS="NAVHEADER"><TABLEWIDTH="100%"BORDER="0"CELLPADDING="0"CELLSPACING="0"><TR><THCOLSPAN="3"ALIGN="center">GTK+ 1.2 Tutorial</TH></TR><TR><TDWIDTH="10%"ALIGN="left"VALIGN="bottom"><AHREF="sec-supplyingtheselection.html"><<< Previous</A></TD><TDWIDTH="80%"ALIGN="center"VALIGN="bottom"></TD><TDWIDTH="10%"ALIGN="right"VALIGN="bottom"><AHREF="sec-draganddropproperties.html">Next >>></A></TD></TR></TABLE><HRALIGN="LEFT"WIDTH="100%"></DIV><DIVCLASS="CHAPTER"><H1><ANAME="CH-DRAGANGDROP">Chapter 21. Drag-and-drop (DND)</A></H1><DIVCLASS="TOC"><DL><DT><B>Table of Contents</B></DT><DT>21.1. <AHREF="ch-dragangdrop.html#SEC-DRAGANDDROPOVERVIEW">Overview</A></DT><DT>21.2. <AHREF="sec-draganddropproperties.html">Properties</A></DT><DT>21.3. <AHREF="sec-draganddropfunctions.html">Functions</A></DT></DL></DIV><P>GTK+ has a high level set of functions for doing inter-processcommunication via the drag-and-drop system. GTK+ can performdrag-and-drop on top of the low level Xdnd and Motif drag-and-dropprotocols.</P><DIVCLASS="SECT1"><H1CLASS="SECT1"><ANAME="SEC-DRAGANDDROPOVERVIEW">21.1. Overview</A></H1><P>An application capable of GTK+ drag-and-drop first defines and sets upthe GTK+ widget(s) for drag-and-drop. Each widget can be a sourceand/or destination for drag-and-drop. Note that these GTK+ widgets must havean associated X Window, check using GTK_WIDGET_NO_WINDOW(widget)).</P><P>Source widgets can send out drag data, thus allowing the user to dragthings off of them, while destination widgets can receive drag data.Drag-and-drop destinations can limit who they accept drag data from,e.g. the same application or any application (including itself).</P><P>Sending and receiving drop data makes use of GTK+ signals.Dropping an item to a destination widget requires both a datarequest (for the source widget) and data received signal handler (forthe target widget). Additional signal handers can be connected if youwant to know when a drag begins (at the very instant it starts), towhen a drop is made, and when the entire drag-and-drop procedure hasended (successfully or not).</P><P>Your application will need to provide data for source widgets whenrequested, that involves having a drag data request signal handler. Fordestination widgets they will need a drop data received signalhandler. </P><P>So a typical drag-and-drop cycle would look as follows:</P><P></P><OLTYPE="1"><LI><P> Drag begins.</P></LI><LI><P> Drag data request (when a drop occurs).</P></LI><LI><P> Drop data received (may be on same or differentapplication).</P></LI><LI><P> Drag data delete (if the drag was a move).</P></LI><LI><P> Drag-and-drop procedure done.</P></LI></OL><P>There are a few minor steps that go in between here and there, but wewill get into detail about that later.</P></DIV></DIV><DIVCLASS="NAVFOOTER"><HRALIGN="LEFT"WIDTH="100%"><TABLEWIDTH="100%"BORDER="0"CELLPADDING="0"CELLSPACING="0"><TR><TDWIDTH="33%"ALIGN="left"VALIGN="top"><AHREF="sec-supplyingtheselection.html"><<< Previous</A></TD><TDWIDTH="34%"ALIGN="center"VALIGN="top"><AHREF="gtk-tut.html">Home</A></TD><TDWIDTH="33%"ALIGN="right"VALIGN="top"><AHREF="sec-draganddropproperties.html">Next >>></A></TD></TR><TR><TDWIDTH="33%"ALIGN="left"VALIGN="top">Supplying the selection</TD><TDWIDTH="34%"ALIGN="center"VALIGN="top"> </TD><TDWIDTH="33%"ALIGN="right"VALIGN="top">Properties</TD></TR></TABLE></DIV> </td> </tr></table> </td> </tr></table></body></BODY></HTML>⌨️ 快捷键说明
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