Is there a Ruby/TK equivalent to the Perl/TK packForget or gridForget
methods, which will remove a widget from display, but doesn't destroy
the widget?
The following example shows how 'TkGrid.forget' can cause some
buttons to disappear.
<code>
# Clicking on the "four" button causes the "four" and "five" buttons to
# disappear.
require 'tk'
DEBUG = []
begin
root = TkRoot.new {title 'Tk Button Grid'}
lbls = ["one", "two", "three", "four", "five"]
btns = lbls.collect do |lbl|
TkButton.new(root, "text"=> lbl, "command"=>lambda { Tk.bell })
end
btns[0, 3].each_with_index do |b, i|
b.grid("row"=>0, "column"=>2*i, "columnspan"=>2)
end
btns[3, 2].each_with_index do |b, i|
b.grid("row"=>1, "column"=>3*i, "columnspan"=>3, "sticky"=>"ew")
end
btns[3].command = lambda { TkGrid.forget(*btns[3, 2]) } # <= *******
quit_btn = TkButton.new(root) {
text "Exit"
command { root.destroy }
}
quit_btn.grid("row"=>2, "column"=>2, "columnspan"=>2,
"sticky"=>"ew")
# Set window geometry.
min_w, min_h = 200, 95
root.minsize(min_w, min_h)
# Initial placement is top-center of screen.
root_x = (root.winfo_screenwidth - min_w) / 2
root.geometry("#{min_w}x#{min_h}+#{root_x}+50")
# Set resize permissions.
root.resizable(false, false)
# Make Cmnd+Q work as expected on OS X.
root.bind('Command-q') { Tk.root.destroy }
Tk.mainloop
ensure
puts DEBUG unless DEBUG.empty?
end
</code>
I imagine 'TkPack.forget' will work for packed widgets, but I have
not actually tried it.
Regards, Morton
