1pack-old(n) Tk Built-In Commands pack-old(n)
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8 pack-old - Obsolete syntax for packer geometry manager
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11 pack after sibling window options ?window options ...?
12 pack append parent window options ?window options ...?
14 pack before sibling window options ?window options ...?
16 pack unpack window
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21 Note: this manual entry describes the syntax for the pack command as it
22 existed before Tk version 3.3. Although this syntax continues to be
23 supported for backward compatibility, it is obsolete and should not be
24 used anymore. At some point in the future it may cease to be sup‐
25 ported.
26 The packer is a geometry manager that arranges the children of a parent
28 by packing them in order around the edges of the parent. The first
29 child is placed against one side of the window, occupying the entire
30 span of the window along that side. This reduces the space remaining
31 for other children as if the side had been moved in by the size of the
32 first child. Then the next child is placed against one side of the re‐
33 maining cavity, and so on until all children have been placed or there
34 is no space left in the cavity.
35 The before, after, and append forms of the pack command are used to in‐
37 sert one or more children into the packing order for their parent. The
38 before form inserts the children before window sibling in the order;
39 all of the other windows must be siblings of sibling. The after form
40 inserts the windows after sibling, and the append form appends one or
41 more windows to the end of the packing order for parent. If a window
42 named in any of these commands is already packed in its parent, it is
43 removed from its current position in the packing order and repositioned
44 as indicated by the command. All of these commands return an empty
45 string as result.
46 The unpack form of the pack command removes window from the packing or‐
48 der of its parent and unmaps it. After the execution of this command
49 the packer will no longer manage window's geometry.
50 The placement of each child is actually a four-step process; the op‐
52 tions argument following each window consists of a list of one or more
53 fields that govern the placement of that window. In the discussion be‐
54 low, the term cavity refers to the space left in a parent when a par‐
55 ticular child is placed (i.e. all the space that was not claimed by
56 earlier children in the packing order). The term parcel refers to the
57 space allocated to a particular child; this is not necessarily the
58 same as the child window's final geometry.
59 The first step in placing a child is to determine which side of the
61 cavity it will lie against. Any one of the following options may be
62 used to specify a side:
63 top Position the child's parcel against the top of the cavity, occu‐
65 pying the full width of the cavity.
66 bottom Position the child's parcel against the bottom of the cavity,
68 occupying the full width of the cavity.
69 left Position the child's parcel against the left side of the cavity,
71 occupying the full height of the cavity.
72 right Position the child's parcel against the right side of the cav‐
74 ity, occupying the full height of the cavity.
75 At most one of these options should be specified for any given window.
77 If no side is specified, then the default is top.
78 The second step is to decide on a parcel for the child. For top and
80 bottom windows, the desired parcel width is normally the cavity width
81 and the desired parcel height is the window's requested height, as
82 passed to Tk_GeometryRequest. For left and right windows, the desired
83 parcel height is normally the cavity height and the desired width is
84 the window's requested width. However, extra space may be requested
85 for the window using any of the following options:
86 padx num Add num pixels to the window's requested width before com‐
88 puting the parcel size as described above.
89 pady num Add num pixels to the window's requested height before com‐
91 puting the parcel size as described above.
92 expand This option requests that the window's parcel absorb any
94 extra space left over in the parent's cavity after packing
95 all the children. The amount of space left over depends on
96 the sizes requested by the other children, and may be zero.
97 If several windows have all specified expand then the extra
98 width will be divided equally among all the left and right
99 windows that specified expand and the extra height will be
100 divided equally among all the top and bottom windows that
101 specified expand.
102 If the desired width or height for a parcel is larger than the corre‐
104 sponding dimension of the cavity, then the cavity's dimension is used
105 instead.
106 The third step in placing the window is to decide on the window's width
108 and height. The default is for the window to receive either its re‐
109 quested width and height or the those of the parcel, whichever is
110 smaller. If the parcel is larger than the window's requested size,
111 then the following options may be used to expand the window to par‐
112 tially or completely fill the parcel:
113 fill Set the window's size to equal the parcel size.
115 fillx Increase the window's width to equal the parcel's width, but re‐
117 tain the window's requested height.
118 filly Increase the window's height to equal the parcel's height, but
120 retain the window's requested width.
121 The last step is to decide the window's location within its parcel. If
123 the window's size equals the parcel's size, then the window simply
124 fills the entire parcel. If the parcel is larger than the window, then
125 one of the following options may be used to specify where the window
126 should be positioned within its parcel:
127 frame center Center the window in its parcel. This is the default if
129 no framing option is specified.
130 frame n Position the window with its top edge centered on the
132 top edge of the parcel.
133 frame ne Position the window with its upper-right corner at the
135 upper-right corner of the parcel.
136 frame e Position the window with its right edge centered on the
138 right edge of the parcel.
139 frame se Position the window with its lower-right corner at the
141 lower-right corner of the parcel.
142 frame s Position the window with its bottom edge centered on the
144 bottom edge of the parcel.
145 frame sw Position the window with its lower-left corner at the
147 lower-left corner of the parcel.
148 frame w Position the window with its left edge centered on the
150 left edge of the parcel.
151 frame nw Position the window with its upper-left corner at the
153 upper-left corner of the parcel.
154 The packer manages the mapped/unmapped state of all the packed children
156 windows. It automatically maps the windows when it packs them, and it
157 unmaps any windows for which there was no space left in the cavity.
158 The packer makes geometry requests on behalf of the parent windows it
160 manages. For each parent window it requests a size large enough to ac‐
161 commodate all the options specified by all the packed children, such
162 that zero space would be leftover for expand options.
163
165 geometry manager, location, packer, parcel, size
166Tk 4.0 pack-old(n)