Node:anchors and packing order, Next:grid, Previous:expand-ing, Up:Geometry managers

anchors and packing order

There is an option to change how a slave is displayed if its allocated space is larger than itself. Normally it will be displayed centered. That can be changed by anchoring it with the -anchor option. The option takes a compass direction as its argument: n, s, e, w, nw, ne, sw, se, or c (for center).

For example, the previous example with the resizing buttons displays the buttons in the center of the window, the default anchoring point. If we wanted the buttons to be displayed at the top of the window then we would anchor them there thus; see also library('tcltk/examples/ex12.tcl'):

button .b1 -text "one"
button .b2 -text "two"
button .b3 -text "three"
pack .b1 .b2 .b3 -side left -fill x -expand 1 -anchor n

The packing order of widget can also be changed. For example,

pack .b3 -before .b2

will change the positions of .b2 and .b3 in our examples.