1place(n) Tk Built-In Commands place(n)
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8 place - Geometry manager for fixed or rubber-sheet placement
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11 place option arg ?arg ...?
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16 The placer is a geometry manager for Tk. It provides simple fixed
17 placement of windows, where you specify the exact size and location of
18 one window, called the slave, within another window, called the master.
19 The placer also provides rubber-sheet placement, where you specify the
20 size and location of the slave in terms of the dimensions of the mas‐
21 ter, so that the slave changes size and location in response to changes
22 in the size of the master. Lastly, the placer allows you to mix these
23 styles of placement so that, for example, the slave has a fixed width
24 and height but is centered inside the master.
25 place window option value ?option value ...?
27 Arrange for the placer to manage the geometry of a slave whose
28 pathName is window. The remaining arguments consist of one or
29 more option-value pairs that specify the way in which window's
30 geometry is managed. Option may have any of the values accepted
31 by the place configure command.
32 place configure window ?option? ?value option value ...?
34 Query or modify the geometry options of the slave given by win‐
35 dow. If no option is specified, this command returns a list
36 describing the available options (see Tk_ConfigureInfo for
37 information on the format of this list). If option is specified
38 with no value, then the command returns a list describing the
39 one named option (this list will be identical to the correspond‐
40 ing sublist of the value returned if no option is specified).
41 If one or more option-value pairs are specified, then the com‐
42 mand modifies the given option(s) to have the given value(s); in
43 this case the command returns an empty string.
44 The following option-value pairs are supported:
46 -anchor where
48 Where specifies which point of window is to be positioned
49 at the (x,y) location selected by the -x, -y, -relx, and
50 -rely options. The anchor point is in terms of the outer
51 area of window including its border, if any. Thus if
52 where is se then the lower-right corner of window's bor‐
53 der will appear at the given (x,y) location in the mas‐
54 ter. The anchor position defaults to nw.
55 -bordermode mode
57 Mode determines the degree to which borders within the
58 master are used in determining the placement of the
59 slave. The default and most common value is inside. In
60 this case the placer considers the area of the master to
61 be the innermost area of the master, inside any border:
62 an option of -x 0 corresponds to an x-coordinate just
63 inside the border and an option of -relwidth 1.0 means
64 window will fill the area inside the master's border.
65 If mode is outside then the placer considers the area of
67 the master to include its border; this mode is typically
68 used when placing window outside its master, as with the
69 options -x 0 -y 0 -anchor ne. Lastly, mode may be speci‐
70 fied as ignore, in which case borders are ignored: the
71 area of the master is considered to be its official X
72 area, which includes any internal border but no external
73 border. A bordermode of ignore is probably not very use‐
74 ful.
75 -height size
77 Size specifies the height for window in screen units
78 (i.e. any of the forms accepted by Tk_GetPixels). The
79 height will be the outer dimension of window including
80 its border, if any. If size is an empty string, or if no
81 -height or -relheight option is specified, then the
82 height requested internally by the window will be used.
83 -in master
85 Master specifies the path name of the window relative to
86 which window is to be placed. Master must either be win‐
87 dow's parent or a descendant of window's parent. In
88 addition, master and window must both be descendants of
89 the same top-level window. These restrictions are neces‐
90 sary to guarantee that window is visible whenever master
91 is visible. If this option is not specified then the
92 master defaults to window's parent.
93 -relheight size
95 Size specifies the height for window. In this case the
96 height is specified as a floating-point number relative
97 to the height of the master: 0.5 means window will be
98 half as high as the master, 1.0 means window will have
99 the same height as the master, and so on. If both
100 -height and -relheight are specified for a slave, their
101 values are summed. For example, -relheight 1.0 -height
102 -2 makes the slave 2 pixels shorter than the master.
103 -relwidth size
105 Size specifies the width for window. In this case the
106 width is specified as a floating-point number relative to
107 the width of the master: 0.5 means window will be half as
108 wide as the master, 1.0 means window will have the same
109 width as the master, and so on. If both -width and -rel‐
110 width are specified for a slave, their values are summed.
111 For example, -relwidth 1.0 -width 5 makes the slave 5
112 pixels wider than the master.
113 -relx location
115 Location specifies the x-coordinate within the master
116 window of the anchor point for window. In this case the
117 location is specified in a relative fashion as a float‐
118 ing-point number: 0.0 corresponds to the left edge of
119 the master and 1.0 corresponds to the right edge of the
120 master. Location need not be in the range 0.0-1.0. If
121 both -x and -relx are specified for a slave then their
122 values are summed. For example, -relx 0.5 -x -2 posi‐
123 tions the left edge of the slave 2 pixels to the left of
124 the center of its master.
125 -rely location
127 Location specifies the y-coordinate within the master
128 window of the anchor point for window. In this case the
129 value is specified in a relative fashion as a floating-
130 point number: 0.0 corresponds to the top edge of the
131 master and 1.0 corresponds to the bottom edge of the mas‐
132 ter. Location need not be in the range 0.0-1.0. If both
133 -y and -rely are specified for a slave then their values
134 are summed. For example, -rely 0.5 -x 3 positions the
135 top edge of the slave 3 pixels below the center of its
136 master.
137 -width size
139 Size specifies the width for window in screen units (i.e.
140 any of the forms accepted by Tk_GetPixels). The width
141 will be the outer width of window including its border,
142 if any. If size is an empty string, or if no -width or
143 -relwidth option is specified, then the width requested
144 internally by the window will be used.
145 -x location
147 Location specifies the x-coordinate within the master
148 window of the anchor point for window. The location is
149 specified in screen units (i.e. any of the forms accepted
150 by Tk_GetPixels) and need not lie within the bounds of
151 the master window.
152 -y location
154 Location specifies the y-coordinate within the master
155 window of the anchor point for window. The location is
156 specified in screen units (i.e. any of the forms accepted
157 by Tk_GetPixels) and need not lie within the bounds of
158 the master window.
159 If the same value is specified separately with two different
161 options, such as -x and -relx, then the most recent option is
162 used and the older one is ignored.
163 place forget window
165 Causes the placer to stop managing the geometry of window. As a
166 side effect of this command window will be unmapped so that it
167 does not appear on the screen. If window is not currently man‐
168 aged by the placer then the command has no effect. This command
169 returns an empty string.
170 place info window
172 Returns a list giving the current configuration of window. The
173 list consists of option-value pairs in exactly the same form as
174 might be specified to the place configure command.
175 place slaves window
177 Returns a list of all the slave windows for which window is the
178 master. If there are no slaves for window then an empty string
179 is returned.
180 If the configuration of a window has been retrieved with place info,
182 that configuration can be restored later by first using place forget to
183 erase any existing information for the window and then invoking place
184 configure with the saved information.
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187 It is not necessary for the master window to be the parent of the slave
188 window. This feature is useful in at least two situations. First, for
189 complex window layouts it means you can create a hierarchy of subwin‐
190 dows whose only purpose is to assist in the layout of the parent. The
191 “real children” of the parent (i.e. the windows that are significant
192 for the application's user interface) can be children of the parent yet
193 be placed inside the windows of the geometry-management hierarchy.
194 This means that the path names of the “real children” do not reflect
195 the geometry-management hierarchy and users can specify options for the
196 real children without being aware of the structure of the geometry-man‐
197 agement hierarchy.
198 A second reason for having a master different than the slave's parent
200 is to tie two siblings together. For example, the placer can be used
201 to force a window always to be positioned centered just below one of
202 its siblings by specifying the configuration
203 -in sibling -relx 0.5 -rely 1.0 -anchor n -bordermode outside
204 Whenever the sibling is repositioned in the future, the slave will be
205 repositioned as well.
206 Unlike many other geometry managers (such as the packer) the placer
208 does not make any attempt to manipulate the geometry of the master win‐
209 dows or the parents of slave windows (i.e. it does not set their
210 requested sizes). To control the sizes of these windows, make them
211 windows like frames and canvases that provide configuration options for
212 this purpose.
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215 Make the label occupy the middle bit of the toplevel, no matter how it
216 is resized:
217 label .l -text "In the\nMiddle!" -bg black -fg white
218 place .l -relwidth .3 -relx .35 -relheight .3 -rely .35
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222 grid(n), pack(n)
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226 geometry manager, height, location, master, place, rubber sheet, slave,
227 width
228Tk place(n)