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Practical Programming in Tcl & Tk, Third Edition
By Brent B. Welch

Table of Contents
Chapter 24.  The Grid Geometry Manager


Spanning Rows and Columns

A widget can occupy more than one cell. The -rowspan and -columnspan attributes indicate how many rows and columns are occupied by a widget. Example 24-7 uses explicit row, column, rowspan, and columnspan specifications:

Example 24-7 Explicit row and column span.

graphics/24fig06.gif


. config -bg white
foreach color {888 999 aaa bbb ccc fff} {
   frame .$color -bg #$color -width 40 -height 40
}
grid .888 -row 0 -column 0 -columnspan 3 -sticky news
grid .999 -row 1 -column 0 -rowspan 2 -sticky news
grid .aaa -row 1 -column 1 -columnspan 2 -sticky news
grid .bbb -row 2 -column 2 -rowspan 2 -sticky news
grid .ccc -row 3 -column 0 -columnspan 2 -sticky news
grid .fff -row 2 -column 1 -sticky news

You can also use special syntax in grid commands that imply row and column placement. Special characters represent a cell that is spanned or skipped:

- represents a spanned column.

^ represents a spanned row.

x represents a skipped cell.

A nice feature of the implicit row and column assignments is that it is easy to make minor changes to your layout. Example 24-8 achieves the same layout:

Example 24-8 Grid syntax row and column span.
. config -bg white
foreach color {888 999 aaa bbb ccc ddd fff} {
   frame .$color -bg #$color -width 40 -height 40
}
grid .888 -      -     -sticky news
grid .999 .aaa   -     -sticky news
grid ^    .fff   .bbb  -sticky news
grid .ccc  -     ^     -sticky news

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