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clipboard(3tk) | Tk Built-In Commands | clipboard(3tk) |
NAME¶
clipboard - Manipulate Tk clipboardSYNOPSIS¶
clipboard option ?arg arg ...?DESCRIPTION¶
This command provides a Tcl interface to the Tk clipboard, which stores data for later retrieval using the selection mechanism (via the -selection CLIPBOARD option). In order to copy data into the clipboard, clipboard clear must be called, followed by a sequence of one or more calls to clipboard append. To ensure that the clipboard is updated atomically, all appends should be completed before returning to the event loop. The first argument to clipboard determines the format of the rest of the arguments and the behavior of the command. The following forms are currently supported:- clipboard clear ?-displayof window?
- Claims ownership of the clipboard on window's display and removes any previous contents. Window defaults to “.”. Returns an empty string.
- clipboard append ?-displayof window? ?-format format? ?-type type? ?--? data
- Appends data to the clipboard on window's display in the form given by type with the representation given by format and claims ownership of the clipboard on window's display.
Type specifies the form in which the selection is to be returned (the
desired “target” for conversion, in ICCCM terminology), and
should be an atom name such as STRING or FILE_NAME; see the Inter-Client
Communication Conventions Manual for complete details. Type defaults to
STRING.
The format argument specifies the representation that should be used to
transmit the selection to the requester (the second column of Table 2 of the
ICCCM), and defaults to STRING. If format is STRING, the selection is
transmitted as 8-bit ASCII characters. If format is ATOM, then the
data is divided into fields separated by white space; each field is
converted to its atom value, and the 32-bit atom value is transmitted instead
of the atom name. For any other format, data is divided into
fields separated by white space and each field is converted to a 32-bit
integer; an array of integers is transmitted to the selection requester. Note
that strings passed to clipboard append are concatenated before
conversion, so the caller must take care to ensure appropriate spacing across
string boundaries. All items appended to the clipboard with the same
type must have the same format.
The format argument is needed only for compatibility with clipboard
requesters that do not use Tk. If the Tk toolkit is being used to retrieve the
CLIPBOARD selection then the value is converted back to a string at the
requesting end, so format is irrelevant.
A -- argument may be specified to mark the end of options: the next
argument will always be used as data. This feature may be convenient
if, for example, data starts with a -.
- clipboard get ?-displayof window? ?-type type?
- Retrieve data from the clipboard on window's display. Window defaults to “.”. Type specifies the form in which the data is to be returned and should be an atom name such as STRING or FILE_NAME. Type defaults to STRING. This command is equivalent to “ selection get -selection CLIPBOARD”.
Note that on modern X11 systems, the most useful type to retrieve for
transferred strings is not STRING, but rather UTF8_STRING.
EXAMPLES¶
Get the current contents of the clipboard.if {[catch { clipboard get} contents]} { # There were no clipboard contents at all }
clipboard clear clipboard append "some fixed string"
# 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>> { clipboard clear clipboard append -type TkCanvasItem \ [getItemConfig %W current] # Delete because this is cut, not copy. %W delete current } bind $c <<Paste>> { catch { set canvas %W eval [ clipboard get -type TkCanvasItem] } }
SEE ALSO¶
interp(3tcl), selection(3tk)KEYWORDS¶
clear, format, clipboard, append, selection, type8.4 | Tk |