1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
|
<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 into
BWidget 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 result
is 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 it
has 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 modify
the 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 or
configuration.
<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 has
changed (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 not
taken from options of widget because they are considered as user command, called by
BWidget implementation of <I>drag-init</I> and <I>drag-end</I> events.
</DD></DL>
</BODY></HTML>
|
