1tk(n) Tk Built-In Commands tk(n)
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8 tk - Manipulate Tk internal state
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11 tk option ?arg arg ...?
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15 The tk command provides access to miscellaneous elements of Tk's inter‐
16 nal state. Most of the information manipulated by this command per‐
17 tains to the application as a whole, or to a screen or display, rather
18 than to a particular window. The command can take any of a number of
19 different forms depending on the option argument. The legal forms are:
20 tk appname ?newName?
22 If newName is not specified, this command returns the name of
23 the application (the name that may be used in send commands to
24 communicate with the application). If newName is specified,
25 then the name of the application is changed to newName. If the
26 given name is already in use, then a suffix of the form “ #2” or
27 “ #3” is appended in order to make the name unique. The com‐
28 mand's result is the name actually chosen. newName should not
29 start with a capital letter. This will interfere with option
30 processing, since names starting with capitals are assumed to be
31 classes; as a result, Tk may not be able to find some options
32 for the application. If sends have been disabled by deleting
33 the send command, this command will reenable them and recreate
34 the send command.
35 tk busy subcommand ...
37 This command controls the marking of window hierarchies as
38 “busy”, rendering them non-interactive while some other opera‐
39 tion is proceeding. For more details see the busy manual page.
40 tk caret window ?-x x? ?-y y? ?-height height?
42 Sets and queries the caret location for the display of the spec‐
43 ified Tk window window. The caret is the per-display cursor
44 location used for indicating global focus (e.g. to comply with
45 Microsoft Accessibility guidelines), as well as for location of
46 the over-the-spot XIM (X Input Methods) or Windows IME windows.
47 If no options are specified, the last values used for setting
48 the caret are return in option-value pair format. -x and -y
49 represent window-relative coordinates, and -height is the height
50 of the current cursor location, or the height of the specified
51 window if none is given.
52 tk inactive ?-displayof window? ?reset?
54 Returns a positive integer, the number of milliseconds since the
55 last time the user interacted with the system. If the -displayof
56 option is given then the return value refers to the display of
57 window; otherwise it refers to the display of the application's
58 main window.
59 tk inactive will return -1, if querying the user inactive time
61 is not supported by the system, and in safe interpreters.
62 If the literal string reset is given as an additional argument,
64 the timer is reset and an empty string is returned. Resetting
65 the inactivity time is forbidden in safe interpreters and will
66 throw an error if tried.
67 tk fontchooser subcommand ...
69 Controls the Tk font selection dialog. For more details see the
70 fontchooser manual page.
71 tk scaling ?-displayof window? ?number?
73 Sets and queries the current scaling factor used by Tk to con‐
74 vert between physical units (for example, points, inches, or
75 millimeters) and pixels. The number argument is a floating
76 point number that specifies the number of pixels per point on
77 window's display. If the window argument is omitted, it
78 defaults to the main window. If the number argument is omitted,
79 the current value of the scaling factor is returned.
80 A “point” is a unit of measurement equal to 1/72 inch. A scal‐
82 ing factor of 1.0 corresponds to 1 pixel per point, which is
83 equivalent to a standard 72 dpi monitor. A scaling factor of
84 1.25 would mean 1.25 pixels per point, which is the setting for
85 a 90 dpi monitor; setting the scaling factor to 1.25 on a 72 dpi
86 monitor would cause everything in the application to be dis‐
87 played 1.25 times as large as normal. The initial value for the
88 scaling factor is set when the application starts, based on
89 properties of the installed monitor, but it can be changed at
90 any time. Measurements made after the scaling factor is changed
91 will use the new scaling factor, but it is undefined whether
92 existing widgets will resize themselves dynamically to accommo‐
93 date the new scaling factor.
94 tk useinputmethods ?-displayof window? ?boolean?
96 Sets and queries the state of whether Tk should use XIM (X Input
97 Methods) for filtering events. The resulting state is returned.
98 XIM is used in some locales (i.e., Japanese, Korean), to handle
99 special input devices. This feature is only significant on X.
100 If XIM support is not available, this will always return 0. If
101 the window argument is omitted, it defaults to the main window.
102 If the boolean argument is omitted, the current state is
103 returned. This is turned on by default for the main display.
104 tk windowingsystem
106 Returns the current Tk windowing system, one of x11 (X11-based),
107 win32 (MS Windows), or aqua (Mac OS X Aqua).
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110 busy(n), fontchooser(n), send(n), winfo(n)
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113 application name, send
114Tk 8.4 tk(n)