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- '/"
- .so man.macros
- .HS pack-old tk
- .BS
- '\" Note: do not modify the .SH NAME line immediately below!
- .SH NAME
- pack \- Obsolete syntax for packer geometry manager
- .SH SYNOPSIS
- \fBpack after \fIsibling \fIwindow options\fR ?\fIwindow options \fR...?
- .sp
- \fBpack append \fIparent \fIwindow options\fR ?\fIwindow options \fR...?
- .sp
- \fBpack before \fIsibling \fIwindow options\fR ?\fIwindow options \fR...?
- .sp
- \fBpack info \fIparent\fR
- .sp
- \fBpack unpack \fIwindow\fR
- .BE
-
- .SH DESCRIPTION
- .PP
- \fINote: this manual entry describes the syntax for the \fBpack\fI
- command as it before Tk version 3.3.
- Although this syntax continues to be supported for backward
- compatibility, it is obsolete and should not be used anymore.
- At some point in the future it may cease to be supported.\fR
- .PP
- The packer is a geometry manager that arranges the
- children of a parent by packing them in order around the edges of
- the parent. The first child is placed against one side of
- the window, occupying the entire span of the window along that
- side. This reduces the space remaining for other children as
- if the side had been moved in by the size of the first child.
- Then the next child is placed against one side of the remaining
- cavity, and so on until all children have been placed or there
- is no space left in the cavity.
- .PP
- The \fBbefore\fR, \fBafter\fR, and \fBappend\fR forms of the \fBpack\fR
- command are used to insert one or more children into the packing order
- for their parent. The \fBbefore\fR form inserts the children before
- window \fIsibling\fR in the order; all of the other windows must be
- siblings of \fIsibling\fR. The \fBafter\fR form inserts the windows
- after \fIsibling\fR, and the \fBappend\fR form appends one or more
- windows to the end of the packing order for \fIparent\fR. If a
- \fIwindow\fR named in any of these commands is already packed in
- its parent, it is removed from its current position in the packing
- order and repositioned as indicated by the command. All of these
- commands return an empty string as result.
- .PP
- .VS
- The \fBunpack\fR form of the \fBpack\fR command removes \fIwindow\fR
- from the packing order of its parent and unmaps it. After the
- execution of this command the packer will no longer manage
- \fIwindow\fR's geometry.
- .VE
- .PP
- The placement of each child is actually a four-step process;
- the \fIoptions\fR argument following each \fIwindow\fR consists of
- a list of one or more fields that govern the placement of that
- window. In the discussion below, the term \fIcavity\fR refers
- to the space left in a parent when a particular child is placed
- (i.e. all the space that wasn't claimed by earlier children in
- the packing order). The term \fIframe\fR refers to the space
- allocated to a particular child; this is not necessarily the
- same as the child window's final geometry.
- .PP
- The first step in placing a child is to determine which side of
- the cavity it will lie against. Any one of the following options
- may be used to specify a side:
- .TP
- \fBtop\fR
- Position the child's frame against the top of the cavity,
- occupying the full width of the cavity.
- .TP
- \fBbottom\fR
- Position the child's frame against the bottom of the cavity,
- occupying the full width of the cavity.
- .TP
- \fBleft\fR
- Position the child's frame against the left side of the cavity,
- occupying the full height of the cavity.
- .TP
- \fBright\fR
- Position the child's frame against the right side of the cavity,
- occupying the full height of the cavity.
- .LP
- At most one of these options should be specified for any given window.
- If no side is specified, then the default is \fBtop\fR.
- .PP
- The second step is to decide on a frame for the child. For \fBtop\fR
- and \fBbottom\fR windows, the desired frame width is normally the cavity
- width and the desired frame height is the window's requested height,
- as passed to \fBTk_GeometryRequest\fR. For \fBleft\fR and \fBright\fR
- windows, the desired frame height is normally the cavity height and the
- desired width is the window's requested width. However, extra
- space may be requested for the window using any of the following
- options:
- .TP 12
- \fBpadx \fInum\fR
- Add \fInum\fR pixels to the window's requested width before computing
- the frame size as described above.
- .TP 12
- \fBpady \fInum\fR
- Add \fInum\fR pixels to the window's requested height before computing
- the frame size as described above.
- .TP 12
- \fBexpand\fR
- This option requests that the window's frame absorb any extra space left over
- in the parent's cavity after packing all the children.
- The amount of space left over depends on the sizes requested by the
- other children, and may be zero. If several windows have all specified
- \fBexpand\fR then the extra width will be divided equally among all the
- \fBleft\fR and \fBright\fR windows that specified \fBexpand\fR and
- the extra height will be divided equally among all the \fBtop\fR and
- \fBbottom\fR windows that specified \fBexpand.
- .LP
- If the desired width or height for a frame is larger than the corresponding
- dimension of the cavity, then the cavity's dimension is used instead.
- .PP
- The third step in placing the window is to decide on the window's
- width and height. The default is for the window to receive either
- its requested width and height or the those of the frame, whichever
- is smaller. If the frame is larger than the window's requested
- size, then the following options may be used to expand the
- window to partially or completely fill the frame:
- .TP
- \fBfill\fR
- Set the window's size to equal the frame size.
- .TP
- \fBfillx\fR
- Increase the window's width to equal the frame's width, but retain
- the window's requested height.
- .TP
- \fBfilly\fR
- Increase the window's height to equal the frame's height, but retain
- the window's requested width.
- .PP
- The last step is to decide the window's location within its frame.
- If the window's size equals the frame's size, then the window simply
- fills the entire frame. If the frame is larger than the window,
- then one of
- the following options may be used to specify where the window should
- be positioned within its frame:
- .TP 15
- \fBframe center\fR
- Center the window in its frame. This is the default if no framing
- option is specified.
- .TP 15
- \fBframe n\fR
- Position the window with its top edge centered on the top edge of
- the frame.
- .TP 15
- \fBframe ne\fR
- Position the window with its upper-right corner at the upper-right corner
- of the frame.
- .TP 15
- \fBframe e\fR
- Position the window with its right edge centered on the right edge of
- the frame.
- .TP 15
- \fBframe se\fR
- Position the window with its lower-right corner at the lower-right corner
- of the frame.
- .TP 15
- \fBframe s\fR
- Position the window with its bottom edge centered on the bottom edge of
- the frame.
- .TP 15
- \fBframe sw\fR
- Position the window with its lower-left corner at the lower-left corner
- of the frame.
- .TP 15
- \fBframe w\fR
- Position the window with its left edge centered on the left edge of
- the frame.
- .TP 15
- \fBframe nw\fR
- Position the window with its upper-left corner at the upper-left corner
- of the frame.
- .PP
- The \fBpack info\fR command may be used to retrieve information about
- the packing order for a parent. It returns a list in the form
- .DS C
- \fIwindow options window options ...\fR
- .DE
- Each \fIwindow\fR is a name of a window packed in \fIparent\fR,
- and the following \fIoptions\fR describes all of the options for that
- window, just as they would be typed to \fBpack append\fR.
- The order of the list is the same as the packing order for
- \fIparent\fR.
- .PP
- The packer manages the mapped/unmapped state of all the packed
- children windows. It automatically maps the windows when it packs
- them, and it unmaps any windows for which there was no space left
- in the cavity.
- .PP
- The packer makes geometry requests on behalf of the parent windows
- it manages. For each parent window it requests a size large enough
- to accommodate all the options specified by all the packed children,
- such that zero space would be leftover for \fBexpand\fR options.
-
- .SH KEYWORDS
- frame, geometry manager, location, packer, size
-