tk(n) Tk Built-In Commands tk(n)______________________________________________________________________________NAMEtk - Manipulate Tk internal state
SYNOPSIStk option ?arg arg ...?
_________________________________________________________________DESCRIPTION
The tk command provides access to miscellaneous elements of Tk's inter-
nal state. Most of the information manipulated by this command per-
tains to the application as a whole, or to a screen or display, rather
than to a particular window. The command can take any of a number of
different forms depending on the option argument. The legal forms are:
tk appname ?newName?
If newName isn't specified, this command returns the name of the
application (the name that may be used in send commands to com-
municate with the application). If newName is specified, then
the name of the application is changed to newName. If the given
name is already in use, then a suffix of the form `` #2'' or ``
#3'' is appended in order to make the name unique. The com-
mand's result is the name actually chosen. newName should not
start with a capital letter. This will interfere with option
processing, since names starting with capitals are assumed to be
classes; as a result, Tk may not be able to find some options
for the application. If sends have been disabled by deleting
the send command, this command will reenable them and recreate
the send command. |
tk caret window ?-x x? ?-y y? ?-height |
height? | |
Sets and queries the caret location for the display of the spec- |
ified Tk window window. The caret is the per-display cursor |
location used for indicating global focus (e.g. to comply with |
Microsoft Accessibility guidelines), as well as for location of |
the over-the-spot XIM (X Input Methods) or Windows IME windows. |
If no options are specified, the last values used for setting |
the caret are return in option-value pair format. -x and -y |
represent window-relative coordinates, and -height is the height |
of the current cursor location, or the height of the specified |
window if none is given.
tk scaling ?-displayof window? ?number?
Sets and queries the current scaling factor used by Tk to con-
vert between physical units (for example, points, inches, or
millimeters) and pixels. The number argument is a floating
point number that specifies the number of pixels per point on
window's display. If the window argument is omitted, it
defaults to the main window. If the number argument is omitted,
the current value of the scaling factor is returned.
A ``point'' is a unit of measurement equal to 1/72 inch. A
scaling factor of 1.0 corresponds to 1 pixel per point, which is
equivalent to a standard 72 dpi monitor. A scaling factor of
1.25 would mean 1.25 pixels per point, which is the setting for
a 90 dpi monitor; setting the scaling factor to 1.25 on a 72 dpi
monitor would cause everything in the application to be dis-
played 1.25 times as large as normal. The initial value for the
scaling factor is set when the application starts, based on
properties of the installed monitor, but it can be changed at
any time. Measurements made after the scaling factor is changed
will use the new scaling factor, but it is undefined whether
existing widgets will resize themselves dynamically to accomo-
date the new scaling factor.
tk useinputmethods ?-displayof window? |
?boolean? | |
Sets and queries the state of whether Tk should use XIM (X Input |
Methods) for filtering events. The resulting state is returned. |
XIM is used in some locales (ie: Japanese, Korean), to handle |
special input devices. This feature is only significant on X. |
If XIM support is not available, this will always return 0. If |
the window argument is omitted, it defaults to the main window. |
If the boolean argument is omitted, the current state is |
returned. This is turned on by default for the main display. |
tk windowingsys- |
tem | |
Returns the current Tk windowing system, one of x11 (X11-based), |
win32 (MS Windows), classic (Mac OS Classic), or aqua (Mac OS X |
Aqua).
KEYWORDS
application name, send
Tk 8.4 tk(n)
