Return window-related information

## NAME

winfo - Return window-related information

## SYNOPSIS

$widget->method(?arg arg ...?)

## DESCRIPTION

These methods are used to retrieve information about windows managed by Tk. They can take any of a number of different forms, depending on the method. The legal forms are:

$widget->atom(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.
$widget->atomname(id)
  Returns the textual name for the atom whose integer identifier is id. This command is the inverse of the $widget->atom command. It generates an error if no such atom exists.
$widget->cells
  Returns a decimal string giving the number of cells in the color map for $widget.
$widget->children
  Returns a list containing all the children of $widget. Top-level windows are returned as children of their logical parents.
$widget->class
  Returns the class name for $widget.
$widget->colormapfull
  Returns 1 if the colormap for $widget 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.
$widget->containing(rootX,rootY)
  Returns 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 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.
$widget->depth
  Returns a decimal string giving the depth of $widget (number of bits per pixel).
Exists($widget)
  Returns 1 if there exists a window for $widget, 0 if no such window exists.
$widget->fpixels(number)
  Returns a floating-point value giving the number of pixels in $widget 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 $widget->pixels.
$widget->geometry
  Returns the geometry for $widget, in the form widthxheight+x+y. All dimensions are in pixels.
$widget->height
  Returns a decimal string giving $widget'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 $widget->reqheight to get the window's requested height instead of its actual height.
$widget->id
  Returns a hexadecimal string indicating the X identifier for $widget.
$widget->interps
  Returns a list whose members are the names of all Tcl interpreters (e.g. all Tk-based applications) currently registered for a particular display. The return value refers to the display of $widget.
$widget->ismapped
  Returns 1 if $widget is currently mapped, 0 otherwise.
$widget->manager
  Returns the name of the geometry manager currently responsible for $widget, or an empty string if $widget isn't managed by any geometry manager. The name is usually the name of the method 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.
$widget->name
  Returns $widget's name (i.e. its name within its parent, as opposed to its full path name). The command $mainwin->name will return the name of the application.
$widget->parent
  Returns $widget's parent, or an empty string if $widget is the main window of the application.
$widget->pathname(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. The identifier is looked up on the display of $widget.
$widget->pixels(number)
  Returns the number of pixels in $widget 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 $widget->fpixels.
$widget->pointerx
  If the mouse pointer is on the same screen as $widget, 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 $widget then -1 is returned.
$widget->pointerxy
  If the mouse pointer is on the same screen as $widget, 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 $widget then both of the returned coordinates are -1.
$widget->pointery
  If the mouse pointer is on the same screen as $widget, 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 $widget then -1 is returned.
$widget->reqheight
  Returns a decimal string giving $widget's requested height, in pixels. This is the value used by $widget's geometry manager to compute its geometry.
$widget->reqwidth
  Returns a decimal string giving $widget's requested width, in pixels. This is the value used by $widget's geometry manager to compute its geometry.
$widget->rgb(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 $widget. Color may be specified in any of the forms acceptable for a color option.
$widget->rootx
  Returns a decimal string giving the x-coordinate, in the root window of the screen, of the upper-left corner of $widget's border (or $widget if it has no border).
$widget->rooty
  Returns a decimal string giving the y-coordinate, in the root window of the screen, of the upper-left corner of $widget's border (or $widget if it has no border).
$widget->screen
  Returns the name of the screen associated with $widget, in the form displayName.screenIndex.
$widget->screencells
  Returns a decimal string giving the number of cells in the default color map for $widget's screen.
$widget->screendepth
  Returns a decimal string giving the depth of the root window of $widget's screen (number of bits per pixel).
$widget->screenheight
  Returns a decimal string giving the height of $widget's screen, in pixels.
$widget->screenmmheight
  Returns a decimal string giving the height of $widget's screen, in millimeters.
$widget->screenmmwidth
  Returns a decimal string giving the width of $widget's screen, in millimeters.
$widget->screenvisual
  Returns one of the following strings to indicate the default visual class for $widget's screen: directcolor, grayscale, pseudocolor, staticcolor, staticgray, or truecolor.
$widget->screenwidth
  Returns a decimal string giving the width of $widget's screen, in pixels.
$widget->server
  Returns a string containing information about the server for $widget'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.
$widget->toplevel
  Returns the path name of the top-level window containing $widget.
$widget->viewable
  Returns 1 if $widget and all of its ancestors up through the nearest toplevel window are mapped. Returns 0 if any of these windows are not mapped.
$widget->visual
  Returns one of the following strings to indicate the visual class for $widget: directcolor, grayscale, pseudocolor, staticcolor, staticgray, or truecolor.
$widget->visualsavailable
  Returns a list whose elements describe the visuals available for $widget's screen. Each element consists of a visual class followed by an integer depth. The class has the same form as returned by $widget->visual. The depth gives the number of bits per pixel in the visual.
$widget->vrootheight
  Returns the height of the virtual root window associated with $widget if there is one; otherwise returns the height of $widget's screen.
$widget->vrootwidth
  Returns the width of the virtual root window associated with $widget if there is one; otherwise returns the width of $widget's screen.
$widget->vrootx
  Returns the x-offset of the virtual root window associated with $widget, 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 $widget.
$widget->vrooty
  Returns the y-offset of the virtual root window associated with $widget, 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 $widget.
$widget->width
  Returns a decimal string giving $widget'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 $widget->reqwidth to get the window's requested width instead of its actual width.
$widget->x
  Returns a decimal string giving the x-coordinate, in $widget's parent, of the upper-left corner of $widget's border (or $widget if it has no border).
$widget->y
  Returns a decimal string giving the y-coordinate, in $widget's parent, of the upper-left corner of $widget's border (or $widget if it has no border).

## KEYWORDS

atom, children, class, geometry, height, identifier, information, interpreters, mapped, parent, path name, screen, virtual root, width, window