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ActiveTcl User Guide |
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- NAME
- place - Geometry manager for fixed or rubber-sheet
placement
- SYNOPSIS
- place option arg ?arg ...?
- DESCRIPTION
- place window
option value ?option value ...?
- place configure
window ?option? ?value option value ...?
- -anchor
where
- -bordermode
mode
- -height
size
- -in
master
- -relheight
size
- -relwidth
size
- -relx
location
- -rely
location
- -width
size
- -x
location
- -y
location
- place forget
window
- place info
window
- place slaves
window
- FINE POINTS
- EXAMPLE
- SEE ALSO
- KEYWORDS
place - Geometry manager for fixed or rubber-sheet placement
place option arg ?arg ...?
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 slave, within another window,
called the master. The placer also provides rubber-sheet
placement, where you specify the size and location of the slave in
terms of the dimensions of the master, so that the slave changes
size and location in response to changes in the size of the master.
Lastly, the placer allows you to mix these styles of placement so
that, for example, the slave has a fixed width and height but is
centered inside the master.
- place window option value ?option
value ...?
- Arrange for the placer to manage the geometry of a slave 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.
- place configure window
?option? ?value option value ...?
- Query or modify the geometry options of the slave 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:
- -anchor where
- 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 master. The anchor position defaults to
nw.
- -bordermode mode
- Mode determines the degree to which borders within the
master are used in determining the placement of the slave. The
default and most common value is inside. In this case the
placer considers the area of the master to be the innermost area of
the master, 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 master's border. If mode is outside then the
placer considers the area of the master to include its border; this
mode is typically used when placing window outside its
master, 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 master 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.
- -height size
- 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.
- -in master
- Master specifies the path name of the window relative to
which window is to be placed. Master must either be
window's parent or a descendant of window's parent.
In addition, master and window must both be
descendants of the same top-level window. These restrictions are
necessary to guarantee that window is visible whenever
master is visible. If this option isn't specified then the
master defaults to window's parent.
- -relheight size
- Size specifies the height for window. In this
case the height is specified as a floating-point number relative to
the height of the master: 0.5 means window will be half as
high as the master, 1.0 means window will have the same
height as the master, and so on. If both -height and
-relheight are specified for a slave, their values are
summed. For example, -relheight 1.0 -height -2 makes the
slave 2 pixels shorter than the master.
- -relwidth size
- Size specifies the width for window. In this case
the width is specified as a floating-point number relative to the
width of the master: 0.5 means window will be half as wide
as the master, 1.0 means window will have the same width as
the master, and so on. If both -width and -relwidth
are specified for a slave, their values are summed. For example,
-relwidth 1.0 -width 5 makes the slave 5 pixels wider than
the master.
- -relx location
- Location specifies the x-coordinate within the master
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 master and 1.0
corresponds to the right edge of the master. Location need
not be in the range 0.0-1.0. If both -x and -relx are
specified for a slave then their values are summed. For example,
-relx 0.5 -x -2 positions the left edge of the slave 2
pixels to the left of the center of its master.
- -rely location
- Location specifies the y-coordinate within the master
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 master and 1.0
corresponds to the bottom edge of the master. Location need
not be in the range 0.0-1.0. If both -y and -rely are
specified for a slave then their values are summed. For example,
-rely 0.5 -x 3 positions the top edge of the slave 3 pixels
below the center of its master.
- -width size
- 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.
- -x location
- Location specifies the x-coordinate within the master
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 master window.
- -y location
- Location specifies the y-coordinate within the master
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 master 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.
- place forget window
- Causes the placer to stop managing the geometry of
window. As a side effect of this command window will
be unmapped so that it doesn't appear on the screen. If
window isn't currently managed by the placer then the
command has no effect. This command returns an empty string.
- place info window
- 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.
- place slaves window
- Returns a list of all the slave windows for which window
is the master. If there are no slaves for window then an
empty string is returned.
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.
It is not necessary for the master window to be the parent of the
slave 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'' don't 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 master different than the slave'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 slave 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
master windows or the parents of slave windows (i.e. it doesn't 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.
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
grid, pack
geometry manager,
height, location, master, place, rubber sheet, slave, width
Copyright © 1992 The Regents of the University of California.
Copyright © 1994-1996 Sun Microsystems, Inc.
Copyright © 1995-1997 Roger E. Critchlow Jr.