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authordkf <donal.k.fellows@manchester.ac.uk>2005-08-04 10:01:57 (GMT)
committerdkf <donal.k.fellows@manchester.ac.uk>2005-08-04 10:01:57 (GMT)
commita33da75b8587cfad8d92ba670a716663fc557192 (patch)
tree36f029707b3ff0edd1cbbbf63f0911ef98ca6691 /doc
parent8f229e54786f30446382b552da2d3f8230a9961e (diff)
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Added another example.
Diffstat (limited to 'doc')
-rw-r--r--doc/clipboard.n44
1 files changed, 42 insertions, 2 deletions
diff --git a/doc/clipboard.n b/doc/clipboard.n
index f12d48f..18e6c54 100644
--- a/doc/clipboard.n
+++ b/doc/clipboard.n
@@ -5,7 +5,7 @@
'\" See the file "license.terms" for information on usage and redistribution
'\" of this file, and for a DISCLAIMER OF ALL WARRANTIES.
'\"
-'\" RCS: @(#) $Id: clipboard.n,v 1.10 2005/04/06 21:11:54 dkf Exp $
+'\" RCS: @(#) $Id: clipboard.n,v 1.11 2005/08/04 10:01:59 dkf Exp $
'\"
.so man.macros
.TH clipboard n 8.4 Tk "Tk Built-In Commands"
@@ -97,9 +97,49 @@ Set the clipboard to contain a fixed string.
\fBclipboard clear\fR
\fBclipboard append\fR "some fixed string"
.CE
+.PP
+You can put custom data into the clipboard by using a custom \fB\-type\fR
+option. This is not necessarily portable, but can be very useful. The
+method of passing Tcl scripts this way is effective, but should be mixed
+with safe interpreters in production code.
+.CS
+# This is a very simple canvas serializer;
+# it produces a script that recreates the item(s) when executed
+proc getItemConfig {canvas tag} {
+ set script {}
+ foreach item [$canvas find withtag $tag] {
+ append script {$canvas create } [$canvas type $item]
+ append script { } [$canvas coords $item] { }
+ foreach config [$canvas itemconf $item] {
+ lassign $config name - - - value
+ append script [list $name $value] { }
+ }
+ append script \\n
+ }
+ return [string trim $script]
+}
+
+# Set up a binding on a canvas to cut and paste an item
+set c [canvas .c]
+pack $c
+$c create text 150 30 -text "cut and paste me"
+bind $c <<Cut>> {
+ \fBclipboard clear\fR
+ \fBclipboard append -type\fR TkCanvasItem \\
+ [getItemConfig %W current]
+ # Delete because this is cut, not copy.
+ %W delete current
+}
+bind $c <<Paste>> {
+ catch {
+ set canvas %W
+ eval [\fBclipboard get -type\fR TkCanvasItem]
+ }
+}
+.CE
.SH "SEE ALSO"
-selection(n)
+interp(n), selection(n)
.SH KEYWORDS
clear, format, clipboard, append, selection, type