1pod::Prima::Widget::pacUks(e3r)Contributed Perl Documentpaotdi:o:nPrima::Widget::pack(3)
2
6 Prima::Widget::pack - Geometry manager that packs around edges of
7 cavity
8
10 $widget-> pack( args);
11 $widget-> packInfo( args);
13 $widget-> geometry( gt::Pack);
14
16 The pack method is used to communicate with the packer, a geometry
17 manager that arranges the children of a owner by packing them in order
18 around the edges of the owner.
19 In this port of Tk::pack it is normal to pack widgets one-at-a-time
21 using the widget object to be packed to invoke a method call. This is
22 a slight distortion of the original Tcl-Tk interface (which can handle
23 lists of windows to one pack method call) but Tk reports that it has
24 proven effective in practice.
25 The pack method can have any of several forms, depending on Option:
27 pack %OPTIONS
29 The options consist of pairs of arguments that specify how to
30 manage the slave. See "The packer algorithm" below for details on
31 how the options are used by the packer. The following options are
32 supported:
33 after => $other
35 $other must be another window. Use its master as the
36 master for the slave, and insert the slave just after
37 $other in the packing order.
38 anchor => anchor
40 Anchor must be a valid anchor position such as n or sw; it
41 specifies where to position each slave in its parcel.
42 Defaults to center.
43 before => $other
45 $other must be another window. Use its master as the
46 master for the slave, and insert the slave just before
47 $other in the packing order.
48 expand => boolean
50 Specifies whether the slave should be expanded to consume
51 extra space in their master. Boolean may have any proper
52 boolean value, such as 1 or no. Defaults to 0.
53 fill => style
55 If a slave's parcel is larger than its requested
56 dimensions, this option may be used to stretch the slave.
57 Style must have one of the following values:
58 none Give the slave its requested dimensions plus
60 any internal padding requested with -ipadx or
61 -ipady. This is the default.
62 x Stretch the slave horizontally to fill the
64 entire width of its parcel (except leave
65 external padding as specified by -padx).
66 y Stretch the slave vertically to fill the entire
68 height of its parcel (except leave external
69 padding as specified by -pady).
70 both Stretch the slave both horizontally and
72 vertically.
73 in => $master
75 Insert the slave(s) at the end of the packing order for the
76 master window given by $master. Currently, only the
77 immediate owner can be accepted as master.
78 ipad => amount
80 Amount specifies how much both horizontal and vertical
81 internal padding to leave on each side of the slave(s).
82 Amount must be a valid screen distance, such as 2 or .5c.
83 It defaults to 0.
84 ipadx => amount
86 Amount specifies how much horizontal internal padding to
87 leave on each side of the slave(s). Amount must be a valid
88 screen distance, such as 2 or .5c. It defaults to 0.
89 ipady => amount
91 Amount specifies how much vertical internal padding to
92 leave on each side of the slave(s). Amount defaults to 0.
93 pad => amount
95 Amount specifies how much horizontal and vertical external
96 padding to leave on each side of the slave(s). Amount
97 defaults to 0.
98 padx => amount
100 Amount specifies how much horizontal external padding to
101 leave on each side of the slave(s). Amount defaults to 0.
102 pady => amount
104 Amount specifies how much vertical external padding to
105 leave on each side of the slave(s). Amount defaults to 0.
106 side => side
108 Specifies which side of the master the slave(s) will be
109 packed against. Must be left, right, top, or bottom.
110 Defaults to top.
111 If no in, after or before option is specified then slave will be
113 inserted at the end of the packing list for its owner unless it is
114 already managed by the packer (in which case it will be left where it
115 is). If one of these options is specified then slave will be inserted
116 at the specified point. If the slave are already managed by the
117 geometry manager then any unspecified options for them retain their
118 previous values rather than receiving default values.
119 packForget
121 Removes slave from the packing order for its master and unmaps its
122 window. The slave will no longer be managed by the packer.
123 packInfo [ %OPTIONS ]
125 In get-mode, returns a list whose elements are the current
126 configuration state of the slave given by $slave. The first two
127 elements of the list are ``in=>$master'' where $master is the
128 slave's master.
129 In set-mode, sets all pack parameters, but does not set widget
131 geometry property to "gt::Pack".
132 packPropagate BOOLEAN
134 If boolean has a true boolean value then propagation is enabled for
135 $master, (see "Geometry propagation" below). If boolean has a
136 false boolean value then propagation is disabled for $master. If
137 boolean is omitted then the method returns 0 or 1 to indicate
138 whether propagation is currently enabled for $master.
139 Propagation is enabled by default.
141 packSlaves
143 Returns a list of all of the slaves in the packing order for
144 $master. The order of the slaves in the list is the same as their
145 order in the packing order. If $master has no slaves then an empty
146 list/string is returned in array/scalar context, respectively
147
149 For each master the packer maintains an ordered list of slaves called
150 the packing list. The in, after, and before configuration options are
151 used to specify the master for each slave and the slave's position in
152 the packing list. If none of these options is given for a slave then
153 the slave is added to the end of the packing list for its owner.
154 The packer arranges the slaves for a master by scanning the packing
156 list in order. At the time it processes each slave, a rectangular area
157 within the master is still unallocated. This area is called the
158 cavity; for the first slave it is the entire area of the master.
159 For each slave the packer carries out the following steps:
161 • The packer allocates a rectangular parcel for the slave along the
163 side of the cavity given by the slave's side option. If the side
164 is top or bottom then the width of the parcel is the width of the
165 cavity and its height is the requested height of the slave plus the
166 ipady and pady options. For the left or right side the height of
167 the parcel is the height of the cavity and the width is the
168 requested width of the slave plus the ipadx and padx options. The
169 parcel may be enlarged further because of the expand option (see
170 "Expansion" below)
171 • The packer chooses the dimensions of the slave. The width will
173 normally be the slave's requested width plus twice its ipadx option
174 and the height will normally be the slave's requested height plus
175 twice its ipady option. However, if the fill option is x or both
176 then the width of the slave is expanded to fill the width of the
177 parcel, minus twice the padx option. If the fill option is y or
178 both then the height of the slave is expanded to fill the width of
179 the parcel, minus twice the pady option.
180 • The packer positions the slave over its parcel. If the slave is
182 smaller than the parcel then the -anchor option determines where in
183 the parcel the slave will be placed. If padx or pady is non-zero,
184 then the given amount of external padding will always be left
185 between the slave and the edges of the parcel.
186 Once a given slave has been packed, the area of its parcel is
188 subtracted from the cavity, leaving a smaller rectangular cavity
189 for the next slave. If a slave doesn't use all of its parcel, the
190 unused space in the parcel will not be used by subsequent slaves.
191 If the cavity should become too small to meet the needs of a slave
192 then the slave will be given whatever space is left in the cavity.
193 If the cavity shrinks to zero size, then all remaining slaves on
194 the packing list will be unmapped from the screen until the master
195 window becomes large enough to hold them again.
196
198 If a master window is so large that there will be extra space left over
199 after all of its slaves have been packed, then the extra space is
200 distributed uniformly among all of the slaves for which the expand
201 option is set. Extra horizontal space is distributed among the
202 expandable slaves whose side is left or right, and extra vertical space
203 is distributed among the expandable slaves whose side is top or bottom.
204
206 The packer normally computes how large a master must be to just exactly
207 meet the needs of its slaves, and it sets the requested width and
208 height of the master to these dimensions. This causes geometry
209 information to propagate up through a window hierarchy to a top-level
210 window so that the entire sub-tree sizes itself to fit the needs of the
211 leaf windows. However, the packPropagate method may be used to turn
212 off propagation for one or more masters. If propagation is disabled
213 then the packer will not set the requested width and height. This may
214 be useful if, for example, you wish for a master window to have a fixed
215 size that you specify.
216
218 The master for each slave must not be a child of the slave, and must
219 not be present in any other list of slaves that directly or indirectly
220 refers to the slave.
221
223 If the master for a slave is not its owner then you must make sure that
224 the slave is higher in the stacking order than the master. Otherwise
225 the master will obscure the slave and it will appear as if the slave
226 hasn't been packed correctly. The easiest way to make sure the slave
227 is higher than the master is to create the master window first: the
228 most recently created window will be highest in the stacking order.
229 Or, you can use the bring_to_front and send_to_back methods to change
230 the stacking order of either the master or the slave.
231
233 Prima, Prima::Widget
234 Tk::pack Tk::place
236perl v5.38.0 2023-07-21 pod::Prima::Widget::pack(3)