Practical Programming in Tcl & Tk, Third Edition

Packer Summary

Keep these rules in mind about the packer:

• Pack vertically (-side top and -side bottom) or horizontally (-side left and -side right) within a frame. Only rarely will a different mixture of packing directions work out the way you want. Add frames to build more complex structures.

• By default, the packer puts widgets into their parent frame, and the parent frame must be created before the children that are packed into it.

• If you put widgets into other relatives, remember to create the frames first so the frames stay underneath the widgets packed into them.

• By default, the packer ignores -width and -height attributes of frames that have widgets packed inside them. It shrinks frames to be just big enough to allow for its border width and ...