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1995-07-25
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331 lines
ppppaaaacccckkkk((((nnnn)))) TTTTkkkk (((( )))) ppppaaaacccckkkk((((nnnn))))
_________________________________________________________________
NNNNAAAAMMMMEEEE
pack - Geometry manager that packs around edges of cavity
SSSSYYYYNNNNOOOOPPPPSSSSIIIISSSS
ppppaaaacccckkkk _o_p_t_i_o_n _a_r_g ?_a_r_g ...?
_________________________________________________________________
DDDDEEEESSSSCCCCRRRRIIIIPPPPTTTTIIIIOOOONNNN
The ppppaaaacccckkkk 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
ppppaaaacccckkkk command can have any of several forms, depending on the
_o_p_t_i_o_n argument:
ppppaaaacccckkkk _s_l_a_v_e ?_s_l_a_v_e ...? ?_o_p_t_i_o_n_s?
If the first argument to ppppaaaacccckkkk is a window name (any
value starting with ``.''), then the command is
processed in the same way as ppppaaaacccckkkk ccccoooonnnnffffiiiigggguuuurrrreeee.
ppppaaaacccckkkk ccccoooonnnnffffiiiigggguuuurrrreeee _s_l_a_v_e ?_s_l_a_v_e ...? ?_o_p_t_i_o_n_s?
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:
----aaaafffftttteeeerrrr _o_t_h_e_r
_O_t_h_e_r must the name of another window. Use its
master as the master for the slaves, and insert
the slaves just after _o_t_h_e_r in the packing order.
----aaaannnncccchhhhoooorrrr _a_n_c_h_o_r
_A_n_c_h_o_r must be a valid anchor position such as nnnn
or sssswwww; it specifies where to position each slave
in its parcel. Defaults to cccceeeennnntttteeeerrrr.
----bbbbeeeeffffoooorrrreeee _o_t_h_e_r
_O_t_h_e_r must the name of another window. Use its
master as the master for the slaves, and insert
the slaves just before _o_t_h_e_r in the packing order.
----eeeexxxxppppaaaannnndddd _b_o_o_l_e_a_n
Specifies whether the slaves should be expanded to
consume extra space in their master. _B_o_o_l_e_a_n may
have any proper boolean value, such as 1111 or nnnnoooo.
Defaults to 0.
----ffffiiiillllllll _s_t_y_l_e
If a slave's parcel is larger than its requested
Page 1 (printed 7/23/95)
ppppaaaacccckkkk((((nnnn)))) TTTTkkkk (((( )))) ppppaaaacccckkkk((((nnnn))))
dimensions, this option may be used to stretch the
slave. _S_t_y_l_e must have one of the following
values:
nnnnoooonnnneeee Give the slave its requested dimensions plus
any internal padding requested with ----iiiippppaaaaddddxxxx or
----iiiippppaaaaddddyyyy. This is the default.
xxxx Stretch the slave horizontally to fill the
entire width of its parcel (except leave
external padding as specified by ----ppppaaaaddddxxxx).
yyyy Stretch the slave vertically to fill the
entire height of its parcel (except leave
external padding as specified by ----ppppaaaaddddyyyy).
bbbbooootttthhhh Stretch the slave both horizontally and
vertically.
----iiiinnnn _o_t_h_e_r
Insert the slave(s) at the end of the packing
order for the master window given by _o_t_h_e_r.
----iiiippppaaaaddddxxxx _a_m_o_u_n_t
_A_m_o_u_n_t specifies how much horizontal internal
padding to leave on each side of the slave(s).
_A_m_o_u_n_t must be a valid screen distance, such as 2222
or ....5555cccc. It defaults to 0.
----iiiippppaaaaddddyyyy _a_m_o_u_n_t
_A_m_o_u_n_t specifies how much vertical internal
padding to leave on each side of the slave(s).
_A_m_o_u_n_t defaults to 0.
----ppppaaaaddddxxxx _a_m_o_u_n_t
_A_m_o_u_n_t specifies how much horizontal external
padding to leave on each side of the slave(s).
_A_m_o_u_n_t defaults to 0.
----ppppaaaaddddyyyy _a_m_o_u_n_t
_A_m_o_u_n_t specifies how much vertical external
padding to leave on each side of the slave(s).
_A_m_o_u_n_t defaults to 0.
----ssssiiiiddddeeee _s_i_d_e
Specifies which side of the master the slave(s)
will be packed against. Must be lllleeeefffftttt, rrrriiiigggghhhhtttt, ttttoooopppp,
or bbbboooottttttttoooommmm. Defaults to ttttoooopppp.
If no ----iiiinnnn, ----aaaafffftttteeeerrrr or ----bbbbeeeeffffoooorrrreeee 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
Page 2 (printed 7/23/95)
ppppaaaacccckkkk((((nnnn)))) TTTTkkkk (((( )))) ppppaaaacccckkkk((((nnnn))))
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.
ppppaaaacccckkkk ffffoooorrrrggggeeeetttt _s_l_a_v_e ?_s_l_a_v_e ...?
Removes each of the _s_l_a_v_es from the packing order for
its master and unmaps their windows. The slaves will
no longer be managed by the packer.
ppppaaaacccckkkk nnnneeeewwwwiiiinnnnffffoooo _s_l_a_v_e
Returns a list whose elements are the current
configuration state of the slave given by _s_l_a_v_e in the
same option-value form that might be specified to ppppaaaacccckkkk
ccccoooonnnnffffiiiigggguuuurrrreeee. The first two elements of the list are
``----iiiinnnn _m_a_s_t_e_r'' where _m_a_s_t_e_r is the slave's master.
Starting with Tk 4.0 this option will be renamed "pack
info".
ppppaaaacccckkkk pppprrrrooooppppaaaaggggaaaatttteeee _m_a_s_t_e_r ?_b_o_o_l_e_a_n?
If _b_o_o_l_e_a_n has a true boolean value such as 1111 or oooonnnn
then propagation is enabled for _m_a_s_t_e_r, which must be a
window name (see ``GEOMETRY PROPAGATION'' below). If
_b_o_o_l_e_a_n has a false boolean value then propagation is
disabled for _m_a_s_t_e_r. In either of these cases an empty
string is returned. If _b_o_o_l_e_a_n is omitted then the
command returns 0000 or 1111 to indicate whether propagation
is currently enabled for _m_a_s_t_e_r. Propagation is
enabled by default.
ppppaaaacccckkkk ssssllllaaaavvvveeeessss _m_a_s_t_e_r
Returns a list of all of the slaves in the packing
order for _m_a_s_t_e_r. The order of the slaves in the list
is the same as their order in the packing order. If
_m_a_s_t_e_r has no slaves then an empty string is returned.
TTTTHHHHEEEE PPPPAAAACCCCKKKKEEEERRRR AAAALLLLGGGGOOOORRRRIIIITTTTHHHHMMMM
For each master the packer maintains an ordered list of
slaves called the _p_a_c_k_i_n_g _l_i_s_t. The ----iiiinnnn, ----aaaafffftttteeeerrrr, and
----bbbbeeeeffffoooorrrreeee 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.
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 _c_a_v_i_t_y; for the first slave it is
Page 3 (printed 7/23/95)
ppppaaaacccckkkk((((nnnn)))) TTTTkkkk (((( )))) ppppaaaacccckkkk((((nnnn))))
the entire area of the master.
For each slave the packer carries out the following steps:
[1] The packer allocates a rectangular _p_a_r_c_e_l for the slave
along the side of the cavity given by the slave's ----ssssiiiiddddeeee
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 ----iiiippppaaaaddddyyyy and
----ppppaaaaddddyyyy 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 ----iiiippppaaaaddddxxxx and
----ppppaaaaddddxxxx options. The parcel may be enlarged further
because of the ----eeeexxxxppppaaaannnndddd option (see ``EXPANSION'' below)
[2] The packer chooses the dimensions of the slave. The
width will normally be the slave's requested width plus
twice its ----iiiippppaaaaddddxxxx option and the height will normally be
the slave's requested height plus twice its ----iiiippppaaaaddddyyyy
option. However, if the ----ffffiiiillllllll option is xxxx or bbbbooootttthhhh then
the width of the slave is expanded to fill the width of
the parcel, minus twice the ----ppppaaaaddddxxxx option. If the ----ffffiiiillllllll
option is yyyy or bbbbooootttthhhh then the height of the slave is
expanded to fill the width of the parcel, minus twice
the ----ppppaaaaddddyyyy option.
[3] The packer positions the slave over its parcel. If the
slave is smaller than the parcel then the ----aaaannnncccchhhhoooorrrr
option determines where in the parcel the slave will be
placed. If ----ppppaaaaddddxxxx or ----ppppaaaaddddyyyy is non-zero, then the given
amount of external padding will always be left between
the slave and the edges of the parcel.
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.
EEEEXXXXPPPPAAAANNNNSSSSIIIIOOOONNNN
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 ----eeeexxxxppppaaaannnndddd option is set. Extra
horizontal space is distributed among the expandable slaves
whose ----ssssiiiiddddeeee is lllleeeefffftttt or rrrriiiigggghhhhtttt, and extra vertical space is
Page 4 (printed 7/23/95)
ppppaaaacccckkkk((((nnnn)))) TTTTkkkk (((( )))) ppppaaaacccckkkk((((nnnn))))
distributed among the expandable slaves whose ----ssssiiiiddddeeee is ttttoooopppp
or bbbboooottttttttoooommmm.
GGGGEEEEOOOOMMMMEEEETTTTRRRRYYYY PPPPRRRROOOOPPPPAAAAGGGGAAAATTTTIIIIOOOONNNN
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 ppppaaaacccckkkk pppprrrrooooppppaaaaggggaaaatttteeee 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.
RRRREEEESSSSTTTTRRRRIIIICCCCTTTTIIIIOOOONNNNSSSS OOOONNNN MMMMAAAASSSSTTTTEEEERRRR WWWWIIIINNNNDDDDOOOOWWWWSSSS
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.
PPPPAAAACCCCKKKKIIIINNNNGGGG OOOORRRRDDDDEEEERRRR
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 rrrraaaaiiiisssseeee and lllloooowwwweeeerrrr commands to
change the stacking order of either the master or the slave.
KKKKEEEEYYYYWWWWOOOORRRRDDDDSSSS
geometry manager, location, packer, parcel, propagation,
size
Page 5 (printed 7/23/95)