Tk Built-In Commands - winfo manual page

## winfo

Return window-related information

### SYNOPSIS

(winfo option ?arg arg ...?)

### DESCRIPTION

The winfo procedure 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 name)
(winfo 'atom :displayof window name)
  Returns a 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 id)
(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 procedure is the inverse of the winfo atom procedure. 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.

(winfo 'class window)
  Returns the class name for window.

(winfo 'colormapfull window)
  Returns #t if the colormap for window is known to be full, #f 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 rootX rootY)
(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 list 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 an integer giving the depth of window (number of bits per pixel).

(winfo 'exists window)
  Returns #t if there exists a window named window, #f 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 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 an integer indicating the X identifier for window.

(winfo 'interps )
(winfo 'interps :displayof window)
  Returns a list whose members are the names of all STk 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 #t if window is currently mapped, #f otherwise.

(winfo 'manager window)
  Returns the name of the geometry manager currently responsible for window, or an empty list if window isn't managed by any geometry manager. The name is usually the name of the STk procedure 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 procedure, 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 procedure (winfo name *root*) will return the name of the application.

(winfo 'parent window)
  Returns the path name of window's parent, or an empty list if window is the main window of the application.

(winfo 'pathname id)
(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 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 an integer 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 an integer 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, 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 an integer 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 an integer 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 an integer giving the number of cells in the default color map for window's screen.

(winfo 'screendepth window)
  Returns an integer giving the depth of the root window of window's screen (number of bits per pixel).

(winfo 'screenheight window)
  Returns an integer giving the height of window's screen, in pixels.

(winfo 'screenmmheight window)
  Returns an integer giving the height of window's screen, in millimeters.

winfo screenmmwidth window
  Returns an integer giving the width of window's screen, in millimeters.

(winfo 'screenvisual window)
  Returns one of the following symbol to indicate the default visual class for window's screen: directcolor, grayscale, pseudocolor, staticcolor, staticgray, or truecolor.

(winfo 'screenwidth window)
  Returns an integer 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 ``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 #t if window and all of its ancestors up through the nearest toplevel window are mapped. Returns #f 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)
(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 an integer 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 an integer 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 an integer giving the y-coordinate, in window's parent, of the upper-left corner of window's border (or window if it has no border).

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