grid.n

linux系统下的音频通信

\fImaster\fR is the slave's master.
.TP
\fBgrid location \fImaster x y\fR
Given  \fIx\fP and \fIy\fP values in screen units relative to the master window, 
the column and row number at that \fIx\fP and \fIy\fP location is returned.
For locations that are above or to the left of the grid, \fB-1\fP is returned.
.TP
\fBgrid propagate \fImaster\fR ?\fIboolean\fR?
If \fIboolean\fR has a true boolean value such as \fB1\fR or \fBon\fR
then propagation is enabled for \fImaster\fR, which must be a window
name (see ``GEOMETRY PROPAGATION'' below).
If \fIboolean\fR has a false boolean value then propagation is
disabled for \fImaster\fR.
In either of these cases an empty string is returned.
If \fIboolean\fR is omitted then the command returns \fB0\fR or
\fB1\fR to indicate whether propagation is currently enabled
for \fImaster\fR.
Propagation is enabled by default.
.TP
\fBgrid rowconfigure \fImaster index \fR?\fI\-option value...\fR?
Query or set the row properties of the \fIindex\fP row of the 
geometry master, \fImaster\fP.
The valid options are \fB\-minsize\fP, \fB\-weight\fP and \fB-pad\fP.
.VS
If one or more options are provided, then \fIindex\fP may be given as 
a list of row indeces to which the configuration options will operate on.
.VE
The \fB\-minsize\fP option sets the minimum size, in screen units,
that will be permitted for this row.
The \fB\-weight\fP option (an integer value)
sets the relative weight for apportioning
any extra spaces among
rows.
A 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 when extra space is allocated to the layout.
The \fB-pad\fP option specifies the number of screen units that will be
added to the largest window contained completely 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
are returned in an list of "-option value" pairs.
.TP
\fBgrid remove \fIslave \fR?\fIslave ...\fR?
Removes each of the \fIslave\fRs from grid for its
master and unmaps their windows.
The slaves will no longer be managed 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.
.TP
\fBgrid size \fImaster\fR
Returns the size of the grid (in columns then rows) for \fImaster\fP.
The size is determined either by the \fIslave\fP occupying the largest
row or column, or the largest column or row with a \fBminsize\fP, 
\fBweight\fP, or \fBpad\fP that is non-zero.
.TP
\fBgrid slaves \fImaster\fR ?\fI\-option value\fR?
If no options are supplied, a list of all of the slaves in \fImaster\fR
are returned, most recently manages first.
\fIOption\fP can be either \fB\-row\fP or \fB\-column\fP which
causes only the slaves in the row (or column) specified by \fIvalue\fP
to be returned.
.SH "RELATIVE PLACEMENT"
.PP
The \fBgrid\fP 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 to be rearranged, 
added, or removed without the need to explicitly specify row and
column information.
When no column or row information is specified for a \fIslave\fP, 
default values are chosen for
\fBcolumn\fP, \fBrow\fP, \fBcolumnspan\fP and \fBrowspan\fP
at the time the \fIslave\fP is managed. The values are chosen
based upon the current layout of the grid, the position of the \fIslave\fP
relative to other \fIslave\fPs in the same grid command, and the presence
of the characters \fB\-\fP, \fB^\fP, and \fB^\fP in \fBgrid\fP
command where \fIslave\fP names are normally expected.
.RS
.TP
\fB\-\fP
This increases the columnspan of the \fIslave\fP to the left.  Several
\fB\-\fP's in a row will successively increase the columnspan. A \fB\-\fP
may not follow a \fB^\fP or a \fBx\fP.
.TP
\fBx\fP
This leaves an empty column between the \fIslave\fP on the left and
the \fIslave\fP on the right.
.TP
\fB^\fP
This extends the \fBrowspan\fP of the \fIslave\fP above the \fB^\fP's
in the grid.  The number of \fB^\fP's in a row must match the number of
columns spanned by the \fIslave\fP above it.
.RE
.SH "THE GRID ALGORITHM"
.PP
The 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 become that size.
In the second step, the requested size is compared 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 \fIsticky\fP flag.
.PP
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
\fIminsize\fP for that row or column, or the sum of the \fIpad\fPding
plus the size of the largest slave, whichever is greater.  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 \fIweight\fP.  For each
group whose weights are all zero, the additional space is apportioned
equally.
.PP
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 there minimum sizes, the layout is
clipped on the bottom and right.
.SH "GEOMETRY PROPAGATION"
.PP
The grid geometry manager normally computes how large a master must be to
just exactly meet the needs of its slaves, and it sets the
requested width and height of the master to these dimensions.
This causes geometry information to propagate 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 \fBgrid propagate\fR command may be used to
turn off propagation for one or more masters.
If propagation 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.

.SH "RESTRICTIONS ON MASTER WINDOWS"
.PP
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 without danger of the slave being clipped by its parent.
In addition, all slaves in one call to \fBgrid\fP must have the same master.
.SH "STACKING ORDER"
.PP
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.
.SH CREDITS
.PP
The \fBgrid\fP command is based on ideas taken from the \fIGridBag\fP
geometry manager written by Doug. Stein, and the \fBblt_table\fR geometry
manager, written by George Howlett.
.SH KEYWORDS
geometry manager, location, grid, cell, propagation, size, pack