hide and show frame in tcl tk gui

Question

I want to make a frame that can be hidden and shown alternatively. The problem is Tk does not provide any hide/unpack command. I use vtcl and there is an option "Window hode" which only hides the window at top level. Now I want to hide a frame and later show the same frame again. It can be thought of as unpacking one frame and showing the other. My code can be like this:

proc show1hide2 { } {
    global i top
    if {$i == 1} {
        unpack $top.frame1
        pack $top.frame2
        set i 0
    } else {
        unpack $top.frame2
        pack $top.frame1
        set i 1
    }
}

In this procedure, $top.frame1 and $top.frame2 were previously filled and value of $i is toggled hence $top.frame1 and $top.frame2 are shown alternatively when this proc is called. All, I want to know is that does there exists and command like unpack which can help me do this? By the way, unpack here is just an idea.

Answer 1

I think that the pack forget command might be what you are looking for:

proc toggle {} {
    global state
    if {$state == 1} {
        pack forget .r
        pack .g   -side bottom -fill x
        set state 0
    } else {
        pack forget .g
        pack .r   -side bottom -fill x

        set state 1
    }
}

set state 1

# Make the widgets
label .r -text "Red Widget"    -bg red
label .g -text "Green Widget" -bg green
button .tog -text "Toggle" -command toggle
# Lay them out
pack .tog
pack .r   -side bottom -fill x