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place(3tk) Tk Built-In Commands place(3tk) 





NAME


place - Geometry manager for fixed or rubber-sheet placement






SYNOPSIS


place option arg ?arg ...?








DESCRIPTION


The placer is a geometry manager for Tk. It provides simple fixed
    placement of windows, where you specify the exact size and location of one
    window, called the content, within another window, called the
    container. The placer also provides rubber-sheet placement, where you
    specify the size and location of the content in terms of the dimensions of
    the container, so that the content changes size and location in response to
    changes in the size of the container. Lastly, the placer allows you to mix
    these styles of placement so that, for example, the content has a fixed
    width and height but is centered inside the container.



  

  
Arrange for the placer to manage the geometry of a content whose pathName
      is window. The remaining arguments consist of one or more
      option-value pairs that specify the way in which window's
      geometry is managed. Option may have any of the values accepted by
      the place configure command.

  

  
Query or modify the geometry options of the content given by
      window. If no option is specified, this command returns a
      list describing the available options (see Tk_ConfigureInfo for
      information on the format of this list). If option is specified
      with no value, then the command returns a list describing the one
      named option (this list will be identical to the corresponding sublist of
      the value returned if no option is specified). If one or more
      option-value pairs are specified, then the command modifies the
      given option(s) to have the given value(s); in this case the command
      returns an empty string.






The following option-value pairs are supported:



  

  
Where specifies which point of window is to be positioned at
      the (x,y) location selected by the -x, -y, -relx, and
      -rely options. The anchor point is in terms of the outer area of
      window including its border, if any. Thus if where is
      se then the lower-right corner of window's border will
      appear at the given (x,y) location in the container. The anchor position
      defaults to nw.

  

  
Mode determines the degree to which borders within the container
      are used in determining the placement of the content. The default and most
      common value is inside. In this case the placer considers the area
      of the container to be the innermost area of the container, inside any
      border: an option of -x 0 corresponds to an x-coordinate just
      inside the border and an option of -relwidth 1.0 means
      window will fill the area inside the container's border.






If mode is outside then the placer considers the
    area of the container to include its border; this mode is typically used
    when placing window outside its container, as with the options -x
    0 -y 0 -anchor ne. Lastly, mode may be specified as
    ignore, in which case borders are ignored: the area of the container
    is considered to be its official X area, which includes any internal border
    but no external border. A bordermode of ignore is probably not very
    useful.





  

  
Size specifies the height for window in screen units (i.e.
      any of the forms accepted by Tk_GetPixels). The height will be the
      outer dimension of window including its border, if any. If
      size is an empty string, or if no -height or
      -relheight option is specified, then the height requested
      internally by the window will be used.

  

  
Container specifies the path name of the window relative to which
      window is to be placed. Container must either be
      window's parent or a descendant of window's parent. In
      addition, container and window must both be descendants of
      the same top-level window. These restrictions are necessary to guarantee
      that window is visible whenever container is visible. If
      this option is not specified then the other window defaults to
      window's parent.

  

  
Size specifies the height for window. In this case the
      height is specified as a floating-point number relative to the height of
      the container: 0.5 means window will be half as high as the
      container, 1.0 means window will have the same height as the
      container, and so on. If both -height and -relheight are
      specified for a content, their values are summed. For example,
      -relheight 1.0 -height -2 makes the content 2 pixels shorter than
      the container.

  

  
Size specifies the width for window. In this case the width
      is specified as a floating-point number relative to the width of the
      container: 0.5 means window will be half as wide as the container,
      1.0 means window will have the same width as the container, and so
      on. If both -width and -relwidth are specified for a
      content, their values are summed. For example, -relwidth 1.0 -width
      5 makes the content 5 pixels wider than the container.

  

  
Location specifies the x-coordinate within the container window of
      the anchor point for window. In this case the location is specified
      in a relative fashion as a floating-point number: 0.0 corresponds to the
      left edge of the container and 1.0 corresponds to the right edge of the
      container. Location need not be in the range 0.0-1.0. If both
      -x and -relx are specified for a content then their values
      are summed. For example, -relx 0.5 -x -2 positions the left edge of
      the content 2 pixels to the left of the center of its container.

  

  
Location specifies the y-coordinate within the container window of
      the anchor point for window. In this case the value is specified in
      a relative fashion as a floating-point number: 0.0 corresponds to the top
      edge of the container and 1.0 corresponds to the bottom edge of the
      container. Location need not be in the range 0.0-1.0. If both
      -y and -rely are specified for a content then their values
      are summed. For example, -rely 0.5 -x 3 positions the top edge of
      the content 3 pixels below the center of its container.

  

  
Size specifies the width for window in screen units (i.e.
      any of the forms accepted by Tk_GetPixels). The width will be the
      outer width of window including its border, if any. If size
      is an empty string, or if no -width or -relwidth option is
      specified, then the width requested internally by the window will be
    used.

  

  
Location specifies the x-coordinate within the container window of
      the anchor point for window. The location is specified in screen
      units (i.e. any of the forms accepted by Tk_GetPixels) and need not
      lie within the bounds of the container window.

  

  
Location specifies the y-coordinate within the container window of
      the anchor point for window. The location is specified in screen
      units (i.e. any of the forms accepted by Tk_GetPixels) and need not
      lie within the bounds of the container window.




If the same value is specified separately with two different
    options, such as -x and -relx, then the most recent option is
    used and the older one is ignored.





  

  
Returns a list of all the content windows for which window is the
      container. If there is no content for window then an empty string
      is returned.

  

  
Causes the placer to stop managing the geometry of window. As a
      side effect of this command window will be unmapped so that it does
      not appear on the screen. If window is not currently managed by the
      placer then the command has no effect. This command returns an empty
      string.

  

  
Returns a list giving the current configuration of window. The list
      consists of option-value pairs in exactly the same form as might be
      specified to the place configure command.

  

  
Synonym for place content window.




If the configuration of a window has been retrieved with place
    info, that configuration can be restored later by first using place
    forget to erase any existing information for the window and then
    invoking place configure with the saved information.






FINE POINTS


It is not necessary for the container window to be the parent of
    the content window. This feature is useful in at least two situations.
    First, for complex window layouts it means you can create a hierarchy of
    subwindows whose only purpose is to assist in the layout of the parent. The
    “real children” of the parent (i.e. the windows that are
    significant for the application's user interface) can be children of the
    parent yet be placed inside the windows of the geometry-management
    hierarchy. This means that the path names of the “real
    children” do not reflect the geometry-management hierarchy and users
    can specify options for the real children without being aware of the
    structure of the geometry-management hierarchy.


A second reason for having a container different than the
    content's parent is to tie two siblings together. For example, the placer
    can be used to force a window always to be positioned centered just below
    one of its siblings by specifying the configuration




-in sibling -relx 0.5 -rely 1.0 -anchor n -bordermode outside



Whenever the sibling is repositioned in the future, the content will be
  repositioned as well.

Unlike many other geometry managers (such as the packer) the
    placer does not make any attempt to manipulate the geometry of the container
    windows or the parents of content windows (i.e. it does not set their
    requested sizes). To control the sizes of these windows, make them windows
    like frames and canvases that provide configuration options for this
    purpose.






EXAMPLE


Make the label occupy the middle bit of the toplevel, no matter
    how it is resized:




label .l -text "In the\nMiddle!" -bg black -fg white
place .l -relwidth .3 -relx .35 -relheight .3 -rely .35








SEE ALSO


grid(3tk), pack(3tk)






KEYWORDS


geometry manager, height, location, container, place, rubber
    sheet, content, width







  

    
    Tk