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