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- '\" $Header: /user6/ouster/wish/man/RCS/pack.n,v 1.11 93/09/12 21:43:11 ouster Exp $ SPRITE (Berkeley)
- '/"
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- .HS pack tk
- .BS
- '\" Note: do not modify the .SH NAME line immediately below!
- .SH NAME
- pack \- Geometry manager that packs around edges of cavity
- .SH SYNOPSIS
- \fBpack \fIoption arg \fR?\fIarg ...\fR?
- .BE
-
- .SH DESCRIPTION
- .PP
- The \fBpack\fR command is used to communicate with the packer,
- a geometry manager that arranges the children of a parent by
- packing them in order around the edges of the parent.
- The \fBpack\fR command can have any of several forms, depending
- on the \fIoption\fR argument:
- .TP
- \fBpack \fIslave \fR?\fIslave ...\fR? ?\fIoptions\fR?
- If the first argument to \fBpack\fR is a window name (any value
- starting with ``.''), then the command is processed in the same
- way as \fBpack configure\fR.
- .TP
- \fBpack configure \fIslave \fR?\fIslave ...\fR? ?\fIoptions\fR?
- The arguments consist of the names of one or more slave windows
- followed by pairs of arguments that specify how
- to manage the slaves.
- See ``THE PACKER ALGORITHM'' below for details on how the options
- are used by the packer.
- The following options are supported:
- .RS
- .TP
- \fB\-after \fIother\fR
- \fIOther\fR must the name of another window.
- Use its master as the master for the slaves, and insert
- the slaves just after \fIother\fR in the packing order.
- .TP
- \fB\-anchor \fIanchor\fR
- \fIAnchor\fR must be a valid anchor position such as \fBn\fR
- or \fBsw\fR; it specifies where to position each slave in its
- parcel.
- Defaults to \fBcenter\fR.
- .TP
- \fB\-before \fIother\fR
- \fIOther\fR must the name of another window.
- Use its master as the master for the slaves, and insert
- the slaves just before \fIother\fR in the packing order.
- .TP
- \fB\-expand \fIboolean\fR
- Specifies whether the slaves should be expanded to consume
- extra space in their master.
- \fIBoolean\fR may have any proper boolean value, such as \fB1\fR
- or \fBno\fR.
- Defaults to 0.
- .TP
- \fB\-fill \fIstyle\fR
- If a slave's parcel is larger than its requested dimensions, this
- option may be used to stretch the slave.
- \fIStyle\fR must have one of the following values:
- .RS
- .TP
- \fBnone\fR
- Give the slave its requested dimensions plus any internal padding
- requested with \fB\-ipadx\fR or \fB\-ipady\fR. This is the default.
- .TP
- \fBx\fR
- Stretch the slave horizontally to fill the entire width of its
- parcel (except leave external padding as specified by \fB\-padx\fR).
- .TP
- \fBy\fR
- Stretch the slave vertically to fill the entire height of its
- parcel (except leave external padding as specified by \fB\-pady\fR).
- .TP
- \fBboth\fR
- Stretch the slave both horizontally and vertically.
- .RE
- .TP
- \fB\-in \fIother\fR
- Insert the slave(s) at the end of the packing order for the master
- window given by \fIother\fR.
- .TP
- \fB\-ipadx \fIamount\fR
- \fIAmount\fR specifies how much horizontal internal padding to
- leave on each side of the slave(s).
- \fIAmount\fR must be a valid screen distance, such as \fB2\fR or \fB.5c\fR.
- It defaults to 0.
- .TP
- \fB\-ipady \fIamount\fR
- \fIAmount\fR specifies how much vertical internal padding to
- leave on each side of the slave(s).
- \fIAmount\fR defaults to 0.
- .TP
- \fB\-padx \fIamount\fR
- \fIAmount\fR specifies how much horizontal external padding to
- leave on each side of the slave(s).
- \fIAmount\fR defaults to 0.
- .TP
- \fB\-pady \fIamount\fR
- \fIAmount\fR specifies how much vertical external padding to
- leave on each side of the slave(s).
- \fIAmount\fR defaults to 0.
- .TP
- \fB\-side \fIside\fR
- Specifies which side of the master the slave(s) will be packed against.
- Must be \fBleft\fR, \fBright\fR, \fBtop\fR, or \fBbottom\fR.
- Defaults to \fBtop\fR.
- .LP
- If no \fB\-in\fR, \fB\-after\fR or \fB\-before\fR option is specified
- then each of the slaves will be inserted at the end of the packing list
- for its parent unless it is already managed by the packer (in which
- case it will be left where it is).
- If one of these options is specified then all the slaves will be
- inserted at the specified point.
- 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.
- .RE
- .TP
- \fBpack forget \fIslave \fR?\fIslave ...\fR?
- Removes each of the \fIslave\fRs from the packing order for its
- master and unmaps their windows.
- The slaves will no longer be managed by the packer.
- .TP
- \fBpack newinfo \fIslave\fR
- Returns a list whose elements are the current configuration state of
- the slave given by \fIslave\fR in the same option-value form that
- might be specified to \fBpack configure\fR.
- The first two elements of the list are ``\fB\-in \fImaster\fR'' where
- \fImaster\fR is the slave's master.
- Starting with Tk 4.0 this option will be renamed "pack info".
- .TP
- \fBpack 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
- \fBpack slaves \fImaster\fR
- Returns a list of all of the slaves in the packing order for \fImaster\fR.
- The order of the slaves in the list is the same as their order in
- the packing order.
- If \fImaster\fR has no slaves then an empty string is returned.
-
- .SH "THE PACKER ALGORITHM"
- .PP
- For each master the packer maintains an ordered list of slaves
- called the \fIpacking list\fR.
- The \fB\-in\fR, \fB\-after\fR, and \fB\-before\fR configuration
- options are used to specify the master for each slave and the slave's
- position in the packing list.
- If none of these options is given for a slave then the slave
- is added to the end of the packing list for its parent.
- .PP
- The packer arranges the slaves for a master by scanning the
- packing list in order.
- At the time it processes each slave, a rectangular area within
- the master is still unallocated.
- This area is called the \fIcavity\fR; for the first slave it
- is the entire area of the master.
- .PP
- For each slave the packer carries out the following steps:
- .IP [1]
- The packer allocates a rectangular \fIparcel\fR for the slave
- along the side of the cavity given by the slave's \fB\-side\fR option.
- If the side is top or bottom then the width of the parcel is
- the width of the cavity and its height is the requested height
- of the slave plus the \fB\-ipady\fR and \fB\-pady\fR options.
- For the left or right side the height of the parcel is
- the height of the cavity and the width is the requested width
- of the slave plus the \fB\-ipadx\fR and \fB\-padx\fR options.
- The parcel may be enlarged further because of the \fB\-expand\fR
- option (see ``EXPANSION'' below)
- .IP [2]
- The packer chooses the dimensions of the slave.
- The width will normally be the slave's requested width plus
- twice its \fB\-ipadx\fR option and the height will normally be
- the slave's requested height plus twice its \fB\-ipady\fR
- option.
- However, if the \fB\-fill\fR option is \fBx\fR or \fBboth\fR
- then the width of the slave is expanded to fill the width of the parcel,
- minus twice the \fB\-padx\fR option.
- If the \fB\-fill\fR option is \fBy\fR or \fBboth\fR
- then the height of the slave is expanded to fill the width of the parcel,
- minus twice the \fB\-pady\fR option.
- .IP [3]
- The packer positions the slave over its parcel.
- If the slave is smaller than the parcel then the \fB\-anchor\fR
- option determines where in the parcel the slave will be placed.
- If \fB\-padx\fR or \fB\-pady\fR is non-zero, then the given
- amount of external padding will always be left between the
- slave and the edges of the parcel.
- .PP
- Once a given slave has been packed, the area of its parcel
- is subtracted from the cavity, leaving a smaller rectangular
- cavity for the next slave.
- If a slave doesn't use all of its parcel, the unused space
- in the parcel will not be used by subsequent slaves.
- If the cavity should become too small to meet the needs of
- a slave then the slave will be given whatever space is
- left in the cavity.
- If the cavity shrinks to zero size, then all remaining slaves
- on the packing list will be unmapped from the screen until
- the master window becomes large enough to hold them again.
-
- .SH "EXPANSION"
- .PP
- If a master window is so large that there will be extra space
- left over after all of its slaves have been packed, then the
- extra space is distributed uniformly among all of the slaves
- for which the \fB\-expand\fR option is set.
- Extra horizontal space is distributed among the expandable
- slaves whose \fB\-side\fR is \fBleft\fR or \fBright\fR,
- and extra vertical space is distributed among the expandable
- slaves whose \fB\-side\fR is \fBtop\fR or \fBbottom\fR.
-
- .SH "GEOMETRY PROPAGATION"
- .PP
- The packer 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 \fBpack propagate\fR command may be used to
- turn off propagation for one or more masters.
- If propagation is disabled then the packer will not set
- the requested width and height of the packer.
- 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.
-
- .SH "PACKING 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 packed 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.
- Or, you can use the \fBraise\fR and \fBlower\fR commands to change
- the stacking order of either the master or the slave.
-
- .SH KEYWORDS
- geometry manager, location, packer, parcel, propagation, size
-