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<HTML><HEAD><TITLE>DragSite</TITLE></HEAD><BODY BGCOLOR=white><DL><DT><I><A HREF="#descr">NAME</A></I></DT><DD><B>DragSite</B> - Commands set for Drag facilities</DD></DL><DL><DT><I><A HREF="#wc">COMMAND</A></I></DT><DD>DragSite::<A HREF="#include"><B>include</B></A> <I>class</I> <I>type</I> <I>event</I></DD><DD>DragSite::<A HREF="#register"><B>register</B></A> <I>path</I> ?<I>option value...</I>?</DD><DD>DragSite::<A HREF="#setdrag"><B>setdrag</B></A> <I>path</I> <I>subpath</I> <I>initcmd</I> <I>endcmd</I> ?<I>force</I>?</DD></DL><BR><HR WIDTH="100%"><BR><B><A NAME="descr"></A>DESCRIPTION</B><BR><P>Commands of this namespace enable user to define a BWidget or a Tk widget as a drag site.</P><HR WIDTH="50%"><BR><B><A NAME="wc">COMMAND</A></B><BR><DL><DT><A NAME="include">DragSite::<B>include</B></A> <I>class</I> <I>type</I> <I>event</I></DT><DD>This command provides a simple way to include options relatives to a drag site intoBWidget resources definition.It includes the options needed for <B>register</B>: <I>-dragevent</I>, initialized to<I>event</I>, <I>-draginitcmd</I> and <I>-dragendcmd</I>, initialized to empty string,and two new options:<TABLE BORDER=0 CELLSPACING=1><TR><TD><I>-dragenabled</I><TD>Specifies wether or not drag is active (initialized to 0)<TR><TD><I>-dragtype</I><TD>Default or alternate dragged data type (initialized to <I>type</I>)</TABLE></DD></DL><DL><DT><A NAME="register">DragSite::<B>register</B></A> <I>path</I> ?<I>option value...</I>?</DT><DD>This command is used to declare <I>path</I> as a drag site. Options are:<P><DL><DT><A NAME="DragSite-dragendcmd"><B>-dragendcmd</B></A></DT><DD>Command called when drag terminates (ie when user release drag icon).This command is called with the following arguments:<UL><LI>the pathname of the drag source (the widget itself),<LI>the pathname of the drop target,<LI>the operation,<LI>the type of the dragged data,<LI>the dragged data,<LI>result of the drop (result of the call to <B>-dropcmd</B> of the target),</UL>If the drop does not occurs, the target and the operation are empty string and the resultis 0.</DD></DL><DL><DT><A NAME="DragSite-dragevent"><B>-dragevent</B></A></DT><DD>Specifies the number of the mouse button associated to the drag.Must be <B>1</B>, <B>2</B> or <B>3</B>.</DD></DL><DL><DT><A NAME="DragSite-draginitcmd"><B>-draginitcmd</B></A></DT><DD>Command called when drag initiates. When the event of option <B>dragevent</B> occurs on<I>path</I>, this command is called with the following arguments:<UL><LI>pathname of the drag source (<I>path</I>),<LI>root x-coordinate of pointer,<LI>root y-coordinate of pointer,<LI>a toplevel created to represent dragged data. When returning, if ithas no children, a bitmap is automatically displayed.</UL>The command must return a list containing three elements:<UL><LI>the type of the data,<LI>the list of acceptable basic operations (<B>copy</B>, <B>move</B> and <B>link</B>)<LI>and the data.</UL>Note that even if <B>copy</I> does not appear in the list of basic operation,it is considered as an acceptable operation, since <B>copy</B> semantic does not modifythe drag source.</DD></DL></DD></DL><DL><DT><A NAME="setdrag">DragSite::<B>setdrag</B></A> <I>path</I> <I>subpath</I> <I>initcmd</I> <I>endcmd</I> ?<I>force</I>?</DT><DD>This command provides a simple way to call <B>register</B> during a BWidget creation orconfiguration.<UL><LI><I>path</I> is the pathname of the BWidget,<LI><I>subpath</I> is the pathname of the tk widget where drag event occurs,<LI><I>initcmd</I> BWidget command for <I>drag-init</I> event,<LI><I>endcmd</I> BWidget command for <I>drag-end</I> event,<LI><I>force</I> specifies wether or not to call <B>register</B> whenever no option value haschanged (0 by default - for BWidget configuration, use 1 for BWidget creation).</UL><B>setdrag</B> verifies the modification flag of options <B>dragenabled</B> and<B>dragevent</B> and calls <B>register</B> if needed according to the options values and<I>initcmd</I> and <I>endcmd</I> arguments. <B>draginitcmd</B> and <B>dragendcmd</B> are nottaken from options of widget  because they are considered as user command, called byBWidget implementation of <I>drag-init</I> and <I>drag-end</I> events.</DD></DL></BODY></HTML>
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