winfo(1T) Tk Built-In Commands winfo(1T)
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NAME
winfo - Return window-related information
SYNOPSIS
winfo option ?arg arg ...?
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DESCRIPTION
The winfo command is used to retrieve information about windows managed by Tk. It can take any of a number of different forms, depending
on the option argument. The legal forms are:
winfo atom ?-displayof window? name
Returns a decimal string giving the integer identifier for the atom whose name is name. If no atom exists with the name name then a
new one is created. If the -displayof option is given then the atom is looked up on the display of window; otherwise it is looked
up on the display of the application's main window.
winfo atomname ?-displayof window? id
Returns the textual name for the atom whose integer identifier is id. If the -displayof option is given then the identifier is
looked up on the display of window; otherwise it is looked up on the display of the application's main window. This command is the
inverse of the winfo atom command. It generates an error if no such atom exists.
winfo cells window
Returns a decimal string giving the number of cells in the color map for window.
winfo children window
Returns a list containing the path names of all the children of window. Top-level windows are returned as children of their logical
parents. The list is in stacking order, with the lowest window first, except for Top-level windows which are not returned in stack-
ing order. Use the wm stackorder command to query the stacking order of Top-level windows.
winfo class window
Returns the class name for window.
winfo colormapfull window
Returns 1 if the colormap for window is known to be full, 0 otherwise. The colormap for a window is ``known'' to be full if the
last attempt to allocate a new color on that window failed and this application hasn't freed any colors in the colormap since the
failed allocation.
winfo containing ?-displayof window? rootX rootY
Returns the path name for the window containing the point given by rootX and rootY. RootX and rootY are specified in screen units
(i.e. any form acceptable to Tk_GetPixels) in the coordinate system of the root window (if a virtual-root window manager is in use
then the coordinate system of the virtual root window is used). If the -displayof option is given then the coordinates refer to the
screen containing window; otherwise they refer to the screen of the application's main window. If no window in this application
contains the point then an empty string is returned. In selecting the containing window, children are given higher priority than
parents and among siblings the highest one in the stacking order is chosen.
winfo depth window
Returns a decimal string giving the depth of window (number of bits per pixel).
winfo exists window
Returns 1 if there exists a window named window, 0 if no such window exists.
winfo fpixels window number
Returns a floating-point value giving the number of pixels in window corresponding to the distance given by number. Number may be
specified in any of the forms acceptable to Tk_GetScreenMM, such as ``2.0c'' or ``1i''. The return value may be fractional; for an
integer value, use winfo pixels.
winfo geometry window
Returns the geometry for window, in the form widthxheight+x+y. All dimensions are in pixels.
winfo height window
Returns a decimal string giving window's height in pixels. When a window is first created its height will be 1 pixel; the height
will eventually be changed by a geometry manager to fulfill the window's needs. If you need the true height immediately after cre-
ating a widget, invoke update to force the geometry manager to arrange it, or use winfo reqheight to get the window's requested
height instead of its actual height.
winfo id window
Returns a hexadecimal string giving a low-level platform-specific identifier for window. On Unix platforms, this is the X window |
identifier. Under Windows, this is the Windows HWND. On the Macintosh the value has no meaning outside Tk.
winfo interps ?-displayof window?
Returns a list whose members are the names of all Tcl interpreters (e.g. all Tk-based applications) currently registered for a par-
ticular display. If the -displayof option is given then the return value refers to the display of window; otherwise it refers to
the display of the application's main window.
winfo ismapped window
Returns 1 if window is currently mapped, 0 otherwise.
winfo manager window
Returns the name of the geometry manager currently responsible for window, or an empty string if window isn't managed by any geome-
try manager. The name is usually the name of the Tcl command for the geometry manager, such as pack or place. If the geometry man-
ager is a widget, such as canvases or text, the name is the widget's class command, such as canvas.
winfo name window
Returns window's name (i.e. its name within its parent, as opposed to its full path name). The command winfo name . will return the
name of the application.
winfo parent window
Returns the path name of window's parent, or an empty string if window is the main window of the application.
winfo pathname ?-displayof window? id
Returns the path name of the window whose X identifier is id. Id must be a decimal, hexadecimal, or octal integer and must corre-
spond to a window in the invoking application. If the -displayof option is given then the identifier is looked up on the display of
window; otherwise it is looked up on the display of the application's main window.
winfo pixels window number
Returns the number of pixels in window corresponding to the distance given by number. Number may be specified in any of the forms
acceptable to Tk_GetPixels, such as ``2.0c'' or ``1i''. The result is rounded to the nearest integer value; for a fractional
result, use winfo fpixels.
winfo pointerx window
If the mouse pointer is on the same screen as window, returns the pointer's x coordinate, measured in pixels in the screen's root
window. If a virtual root window is in use on the screen, the position is measured in the virtual root. If the mouse pointer isn't
on the same screen as window then -1 is returned.
winfo pointerxy window
If the mouse pointer is on the same screen as window, returns a list with two elements, which are the pointer's x and y coordinates
measured in pixels in the screen's root window. If a virtual root window is in use on the screen, the position is computed in the
virtual root. If the mouse pointer isn't on the same screen as window then both of the returned coordinates are -1.
winfo pointery window
If the mouse pointer is on the same screen as window, returns the pointer's y coordinate, measured in pixels in the screen's root
window. If a virtual root window is in use on the screen, the position is computed in the virtual root. If the mouse pointer isn't
on the same screen as window then -1 is returned.
winfo reqheight window
Returns a decimal string giving window's requested height, in pixels. This is the value used by window's geometry manager to com-
pute its geometry.
winfo reqwidth window
Returns a decimal string giving window's requested width, in pixels. This is the value used by window's geometry manager to compute
its geometry.
winfo rgb window color
Returns a list containing three decimal values in the range 0 to 65535, which are the red, green, and blue intensities that corre-
spond to color in the window given by window. Color may be specified in any of the forms acceptable for a color option.
winfo rootx window
Returns a decimal string giving the x-coordinate, in the root window of the screen, of the upper-left corner of window's border (or
window if it has no border).
winfo rooty window
Returns a decimal string giving the y-coordinate, in the root window of the screen, of the upper-left corner of window's border (or
window if it has no border).
winfo screen window
Returns the name of the screen associated with window, in the form displayName.screenIndex.
winfo screencells window
Returns a decimal string giving the number of cells in the default color map for window's screen.
winfo screendepth window
Returns a decimal string giving the depth of the root window of window's screen (number of bits per pixel).
winfo screenheight window
Returns a decimal string giving the height of window's screen, in pixels.
winfo screenmmheight window
Returns a decimal string giving the height of window's screen, in millimeters.
winfo screenmmwidth window
Returns a decimal string giving the width of window's screen, in millimeters.
winfo screenvisual window
Returns one of the following strings to indicate the default visual class for window's screen: directcolor, grayscale, pseudocolor,
staticcolor, staticgray, or truecolor.
winfo screenwidth window
Returns a decimal string giving the width of window's screen, in pixels.
winfo server window
Returns a string containing information about the server for window's display. The exact format of this string may vary from plat-
form to platform. For X servers the string has the form ``XmajorRminor vendor vendorVersion'' where major and minor are the version
and revision numbers provided by the server (e.g., X11R5), vendor is the name of the vendor for the server, and vendorRelease is an
integer release number provided by the server.
winfo toplevel window
Returns the path name of the top-level window containing window.
winfo viewable window
Returns 1 if window and all of its ancestors up through the nearest toplevel window are mapped. Returns 0 if any of these windows
are not mapped.
winfo visual window
Returns one of the following strings to indicate the visual class for window: directcolor, grayscale, pseudocolor, staticcolor,
staticgray, or truecolor.
winfo visualid window
Returns the X identifier for the visual for window.
winfo visualsavailable window ?includeids?
Returns a list whose elements describe the visuals available for window's screen. Each element consists of a visual class followed
by an integer depth. The class has the same form as returned by winfo visual. The depth gives the number of bits per pixel in the
visual. In addition, if the includeids argument is provided, then the depth is followed by the X identifier for the visual.
winfo vrootheight window
Returns the height of the virtual root window associated with window if there is one; otherwise returns the height of window's
screen.
winfo vrootwidth window
Returns the width of the virtual root window associated with window if there is one; otherwise returns the width of window's
screen.
winfo vrootx window
Returns the x-offset of the virtual root window associated with window, relative to the root window of its screen. This is normally
either zero or negative. Returns 0 if there is no virtual root window for window.
winfo vrooty window
Returns the y-offset of the virtual root window associated with window, relative to the root window of its screen. This is normally
either zero or negative. Returns 0 if there is no virtual root window for window.
winfo width window
Returns a decimal string giving window's width in pixels. When a window is first created its width will be 1 pixel; the width will
eventually be changed by a geometry manager to fulfill the window's needs. If you need the true width immediately after creating a
widget, invoke update to force the geometry manager to arrange it, or use winfo reqwidth to get the window's requested width instead
of its actual width.
winfo x window
Returns a decimal string giving the x-coordinate, in window's parent, of the upper-left corner of window's border (or window if it
has no border).
winfo y window
Returns a decimal string giving the y-coordinate, in window's parent, of the upper-left corner of window's border (or window if it
has no border).
EXAMPLE
Print where the mouse pointer is and what window it is currently over:
set x [winfo pointerx .]
set y [winfo pointery .]
puts -nonewline "Mouse pointer at ($x,$y) which is "
set win [winfo containing $x $y]
if {$win eq ""} {
puts "over no window"
} else {
puts "over $win"
}
KEYWORDS
atom, children, class, geometry, height, identifier, information, interpreters, mapped, parent, path name, screen, virtual root, width,
window
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
+--------------------+-----------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+--------------------+-----------------+
|Availability | SUNWTk |
+--------------------+-----------------+
|Interface Stability | Uncommitted |
+--------------------+-----------------+
NOTES
Source for Tk is available on http://opensolaris.org.
Tk 4.3 winfo(1T)