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## Tcl/Tk Documentation > TkCmd > winfo

### Tcl/Tk Applications | Tcl Commands | Tk Commands | Tcl Library | Tk Library

  NAME
    winfo - Return window-related information
  SYNOPSIS
    winfo option ?arg arg ...?
  DESCRIPTION
    winfo atom ?-displayof window? name
    winfo atomname ?-displayof window? id
    winfo cells window
    winfo children window
    winfo class window
    winfo colormapfull window
    winfo containing ?-displayof window? rootX rootY
    winfo depth window
    winfo exists window
    winfo fpixels window number
    winfo geometry window
    winfo height window
    winfo id window
    winfo interps ?-displayof window?
    winfo ismapped window
    winfo manager window
    winfo name window
    winfo parent window
    winfo pathname ?-displayof window? id
    winfo pixels window number
    winfo pointerx window
    winfo pointerxy window
    winfo pointery window
    winfo reqheight window
    winfo reqwidth window
    winfo rgb window color
    winfo rootx window
    winfo rooty window
    winfo screen window
    winfo screencells window
    winfo screendepth window
    winfo screenheight window
    winfo screenmmheight window
    winfo screenmmwidth window
    winfo screenvisual window
    winfo screenwidth window
    winfo server window
    winfo toplevel window
    winfo viewable window
    winfo visual window
    winfo visualid window
    winfo visualsavailable window ?includeids?
    winfo vrootheight window
    winfo vrootwidth window
    winfo vrootx window
    winfo vrooty window
    winfo width window
    winfo x window
    winfo y window
  EXAMPLE
  KEYWORDS

### NAME

winfo - Return window-related information

### SYNOPSIS

winfo option ?arg arg ...?

### 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 stacking 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 has not 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 width x height+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 creating 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 particular 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 is not managed by any geometry manager. The name is usually the name of the Tcl command for the geometry manager, such as pack or place. If the geometry manager 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 correspond 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 is not 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 is not 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 is not 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 compute 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 correspond 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 platform to platform. For X servers the string has the form “X major R minor 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-of-hierarchy window containing window. In standard Tk this will always be a toplevel widget, but extensions may create other kinds of top-of-hierarchy widgets.
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:

    lassign [winfo pointerxy .] x y
    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
Copyright © 1995-1997 Roger E. Critchlow Jr. Copyright © 1990-1994 The Regents of the University of California. Copyright © 1994-1997 Sun Microsystems, Inc.