Tk Built-In Commands grid(1T)
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NAME
grid - Geometry manager that arranges widgets in a grid
SYNOPSIS
grid option arg ?arg ...?
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DESCRIPTION
The grid command is used to communicate with the grid
geometry manager that arranges widgets in rows and columns inside of another window, called the geometry master (ormaster window). The grid command can have any of several
forms, depending on the option argument:grid slave ?slave ...? ?options?
If the first argument to grid is suitable as the first
slave argument to grid configure, either a window name
(any value starting with .) or one of the characters x or ^ (see the RELATIVE PLACEMENT section below), thenthe command is processed in the same way as grid con-
figure.grid bbox master ?column row? ?column2 row2?
With no arguments, the bounding box (in pixels) of thegrid is returned. The return value consists of 4
integers. The first two are the pixel offset from themaster window (x then y) of the top-left corner of the
grid, and the second two integers are the width and
height of the grid, also in pixels. If a single column
and row is specified on the command line, then the bounding box for that cell is returned, where the top left cell is numbered from zero. If both column and row arguments are specified, then the bounding box spanning the rows and columns indicated is returned.grid columnconfigure master index ?-option value...?
Query or set the column properties of the index column of the geometry master, master. The valid options are |-minsize, -weight, -uniform and -pad. If one or more
options are provided, then index may be given as a list of column indices to which the configuration optionswill operate on. The -minsize option sets the minimum
size, in screen units, that will be permitted for thiscolumn. The -weight option (an integer value) sets the
relative weight for apportioning any extra spaces among columns. A weight of zero (0) indicates the column will not deviate from its requested size. A column whose weight is two will grow at twice the rate as a column of weight one when extra space is allocated to Tk Last change: 8.4 1Tk Built-In Commands grid(1T)
the layout. The -uniform option, when a non-empty |
value is supplied, places the column in a uniform group |with other columns that have the same value for -uni- |
form. The space for columns belonging to a uniform | group is allocated so that their sizes are always in |strict proportion to their -weight values. See THE |
GRID ALGORITHM below for further details. The -pad
option specifies the number of screen units that will be added to the largest window contained completely inthat column when the grid geometry manager requests a
size from the containing window. If only an option is specified, with no value, the current value of that option is returned. If only the master window and index is specified, all the current settings arereturned in a list of "-option value" pairs.
grid configure slave ?slave ...? ?options?
The arguments consist of the names of one or more slave windows followed by pairs of arguments that specify howto manage the slaves. The characters -, x and ^, can
be specified instead of a window name to alter thedefault location of a slave, as described in the RELA-
TIVE PLACEMENT section, below. The following options are supported:-column n
Insert the slave so that it occupies the nthcolumn in the grid. Column numbers start with 0.
If this option is not supplied, then the slave is arranged just to the right of previous slavespecified on this call to grid, or column "0" if
it is the first slave. For each x that immedi-
ately precedes the slave, the column position is incremented by one. Thus the x represents a blankcolumn for this row in the grid.
-columnspan n
Insert the slave so that it occupies n columns inthe grid. The default is one column, unless the
window name is followed by a -, in which case the
columnspan is incremented once for each immedi-
ately following -.
-in other
Insert the slave(s) in the master window given by other. The default is the first slave's parent window.-ipadx amount
The amount specifies how much horizontal internal padding to leave on each side of the slave(s). This is space is added inside the slave(s) border. Tk Last change: 8.4 2Tk Built-In Commands grid(1T)
The amount must be a valid screen distance, such as 2 or .5c. It defaults to 0.-ipady amount
The amount specifies how much vertical internal padding to leave on the top and bottom of the slave(s). This space is added inside the slave(s) border. The amount defaults to 0.-padx amount
The amount specifies how much horizontal external padding to leave on each side of the slave(s), in screen units. Amount may be a list of two values to specify padding for left and right separately. The amount defaults to 0. This space is added outside the slave(s) border.-pady amount
The amount specifies how much vertical external padding to leave on the top and bottom of the slave(s), in screen units. Amount may be a listof two values to specify padding for top and bot-
tom separately. The amount defaults to 0. This space is added outside the slave(s) border.-row n
Insert the slave so that it occupies the nth rowin the grid. Row numbers start with 0. If this
option is not supplied, then the slave is arranged on the same row as the previous slave specified onthis call to grid, or the first unoccupied row if
this is the first slave.-rowspan n
Insert the slave so that it occupies n rows in thegrid. The default is one row. If the next grid
command contains ^ characters instead of slaves that line up with the columns of this slave, then the rowspan of this slave is extended by one.-sticky style
If a slave's cell is larger than its requested dimensions, this option may be used to position (or stretch) the slave within its cell. Style isa string that contains zero or more of the charac-
ters n, s, e or w. The string can optionally con-
tains spaces or commas, but they are ignored. Each letter refers to a side (north, south, east, or west) that the slave will "stick" to. If both n and s (or e and w) are specified, the slave will be stretched to fill the entire height (or width) of its cavity. The sticky option subsumes the Tk Last change: 8.4 3Tk Built-In Commands grid(1T)
combination of -anchor and -fill that is used by
pack. The default is {}, which causes the slave to be centered in its cavity, at its requested size. If any of the slaves are already managed by the geometry manager then any unspecified options for them retain their previous values rather than receiving default values.grid forget slave ?slave ...?
Removes each of the slaves from grid for its master and
unmaps their windows. The slaves will no longer bemanaged by the grid geometry manager. The configura-
tion options for that window are forgotten, so that ifthe slave is managed once more by the grid geometry
manager, the initial default settings are used.grid info slave
Returns a list whose elements are the current confi-
guration state of the slave given by slave in the sameoption-value form that might be specified to grid con-
figure. The first two elements of the list are ``-in
master'' where master is the slave's master.grid location master x y
Given x and y values in screen units relative to the master window, the column and row number at that x and y location is returned. For locations that are aboveor to the left of the grid, -1 is returned.
grid propagate master ?boolean?
If boolean has a true boolean value such as 1 or on then propagation is enabled for master, which must be a window name (see GEOMETRY PROPAGATION below). If boolean has a false boolean value then propagation is disabled for master. In either of these cases an empty string is returned. If boolean is omitted then the command returns 0 or 1 to indicate whether propagation is currently enabled for master. Propagation is enabled by default.grid rowconfigure master index ?-option value...?
Query or set the row properties of the index row of thegeometry master, master. The valid options are -min- |
size, -weight, -uniform and -pad. If one or more
options are provided, then index may be given as a list of row indices to which the configuration options willoperate on. The -minsize option sets the minimum size,
in screen units, that will be permitted for this row.The -weight option (an integer value) sets the relative
weight for apportioning any extra spaces among rows. A Tk Last change: 8.4 4Tk Built-In Commands grid(1T)
weight of zero (0) indicates the row will not deviate from its requested size. A row whose weight is two will grow at twice the rate as a row of weight one whenextra space is allocated to the layout. The -uniform |
option, when a non-empty value is supplied, places the |
row in a uniform group with other rows that have the |same value for -uniform. The space for rows belonging |
to a uniform group is allocated so that their sizes are |always in strict proportion to their -weight values. |
See THE GRID ALGORITHM below for further details. The-pad option specifies the number of screen units that
will be added to the largest window contained com-
pletely in that row when the grid geometry manager
requests a size from the containing window. If only an option is specified, with no value, the current value of that option is returned. If only the master window and index is specified, all the current settings arereturned in a list of "-option value" pairs.
grid remove slave ?slave ...?
Removes each of the slaves from grid for its master and
unmaps their windows. The slaves will no longer bemanaged by the grid geometry manager. However, the
configuration options for that window are remembered,so that if the slave is managed once more by the grid
geometry manager, the previous values are retained.grid size master
Returns the size of the grid (in columns then rows) for
master. The size is determined either by the slave occupying the largest row or column, or the largest column or row with a minsize, weight, or pad that isnon-zero.
grid slaves master ?-option value?
If no options are supplied, a list of all of the slaves in master are returned, most recently manages first.Option can be either -row or -column which causes only
the slaves in the row (or column) specified by value to be returned. RELATIVE PLACEMENTThe grid command contains a limited set of capabilities that
permit layouts to be created without specifying the row and column information for each slave. This permits slaves tobe rearranged, added, or removed without the need to expli-
citly specify row and column information. When no column or row information is specified for a slave, default values are chosen for column, row, columnspan and rowspan at the time the slave is managed. The values are chosen based upon thecurrent layout of the grid, the position of the slave rela-
tive to other slaves in the same grid command, and the
Tk Last change: 8.4 5Tk Built-In Commands grid(1T)
presence of the characters -, x, and ^ in grid command where
slave names are normally expected.- This increases the columnspan of the slave to the
left. Several -'s in a row will successively
increase the columnspan. A - may not follow a ^ or
a x, nor may it be the first slave argument togrid configure.
x This leaves an empty column between the slave on the left and the slave on the right. ^ This extends the rowspan of the slave above the^'s in the grid. The number of ^'s in a row must
match the number of columns spanned by the slave above it. THE GRID ALGORITHMThe grid geometry manager lays out its slaves in three
steps. In the first step, the minimum size needed to fit all of the slaves is computed, then (if propagation is turned on), a request is made of the master window to becomethat size. In the second step, the requested size is com-
pared against the actual size of the master. If the sizes are different, then spaces is added to or taken away from the layout as needed. For the final step, each slave is positioned in its row(s) and column(s) based on the setting of its sticky flag.To compute the minimum size of a layout, the grid geometry
manager first looks at all slaves whose columnspan and rowspan values are one, and computes the nominal size of each row or column to be either the minsize for that row orcolumn, or the sum of the padding plus the size of the larg-
est slave, whichever is greater. After that the rows or columns in each uniform group adapt to each other. Then the slaves whose rowspans or columnspans are greater than one are examined. If a group of rows or columns need to be increased in size in order to accommodate these slaves, then extra space is added to each row or column in the group according to its weight. For each group whose weights are all zero, the additional space is apportioned equally. When multiple rows or columns belong to a uniform group, the space allocated to them is always in proportion to their weights. (A weight of zero is considered to be 1.) In otherwords, a row or column configured with -weight 1 -uniform a
will have exactly the same size as any other row or columnconfigured with -weight 1 -uniform a. A row or column con-
figured with -weight 2 -uniform b will be exactly twice as
large as one that is configured with -weight 1 -uniform b.
Tk Last change: 8.4 6Tk Built-In Commands grid(1T)
More technically, each row or column in the group will have a size equal to k*weight for some constant k. The constant k is chosen so that no row or column becomes smaller than its minimum size. For example, if all rows or columns in a group have the same weight, then each row or column will have the same size as the largest row or column in the group. For masters whose size is larger than the requested layout, the additional space is apportioned according to the row and column weights. If all of the weights are zero, the layout is centered within its master. For masters whose size is smaller than the requested layout, space is taken away from columns and rows according to their weights. However, once a column or row shrinks to its minsize, its weight is taken to be zero. If more space needs to be removed from a layout than would be permitted, as when all the rows or columns are at their minimum sizes, the layout is clipped on the bottom and right. GEOMETRY PROPAGATIONThe grid geometry manager normally computes how large a mas-
ter must be to just exactly meet the needs of its slaves, and it sets the requested width and height of the master tothese dimensions. This causes geometry information to pro-
pagate up through a window hierarchy to a top-level window
so that the entire sub-tree sizes itself to fit the needs of
the leaf windows. However, the grid propagate command may
be used to turn off propagation for one or more masters. Ifpropagation is disabled then grid will not set the requested
width and height of the master window. This may be useful if, for example, you wish for a master window to have a fixed size that you specify. RESTRICTIONS ON MASTER WINDOWS The master for each slave must either be the slave's parent (the default) or a descendant of the slave's parent. This restriction is necessary to guarantee that the slave can be placed over any part of its master that is visible withoutdanger of the slave being clipped by its parent. In addi-
tion, all slaves in one call to grid must have the same mas-
ter. STACKING ORDER If the master for a slave is not its parent then you must make sure that the slave is higher in the stacking order than the master. Otherwise the master will obscure the slave and it will appear as if the slave hasn't been managed correctly. The easiest way to make sure the slave is higher than the master is to create the master window first: the most recently created window will be highest in the stacking order. Tk Last change: 8.4 7Tk Built-In Commands grid(1T)
CREDITSThe grid command is based on ideas taken from the GridBag
geometry manager written by Doug. Stein, and the blt_table
geometry manager, written by George Howlett.EXAMPLES
A toplevel window containing a text widget and two scrollbars:# Make the widgets
toplevel .ttext .t.txt -wrap none -xscroll {.t.h set} -yscroll {.t.v set}
scrollbar .t.v -orient vertical -command {.t.txt xview}
scrollbar .t.h -orient horizontal -command {.t.txt xview}
# Lay them out
grid .t.txt .t.v -sticky nsew
grid .t.h -sticky nsew
# Tell the text widget to take all the extra room
grid rowconfigure .t 0 -weight 1
grid columnconfigure .t 0 -weight 1
Three widgets of equal width, despite their different "natural" widths:button .b -text "Foo"
entry .e -variable foo
label .l -text "This is a fairly long piece of text"
grid .b .e .l -sticky ew
grid columnconfigure . {0 1 2} -uniform allTheSame
SEE ALSO
pack(1T), place(1T) KEYWORDSgeometry manager, location, grid, cell, propagation, size,
packATTRIBUTES
See attributes(5) for descriptions of the following attri-
butes: Tk Last change: 8.4 8Tk Built-In Commands grid(1T)
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| ATTRIBUTE TYPE | ATTRIBUTE VALUE|
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| Availability | runtime/tk-8 |
|____________________|__________________|_
| Interface Stability| Uncommitted ||____________________|_________________|
NOTES Source for Tk is available on http://opensolaris.org. Tk Last change: 8.4 9