Question

I can’t align middle a list_box in ruby shoes. I have test a few things, including :right => “50” or :left => “50”, but it still not work.

Shoes.app do 
  stack :width => "100%", :height => "45%" do
    a = list_box :items => ["lol","b"], :width => 50, :align => "center"
  end
end

Answer 1

I did not find a direct way but you can use this hack

module Shoes::Types
def centr
 left=(self.parent.width-self.style[:width])/2
 self.move(left,self.top)
end

def middle
 top=(self.parent.height-self.style[:height])/2
 self.move(self.left,top) 
end
end

Shoes.app do 
 @c=stack :width=>50, :height=>30 do
  a=list_box :items => ["lol","b"], :width => 50, :height=>30
 end
 @c.centr.middle
end

What is done is actually first to extend the functionality of slots so that you can place them in the center or middle of the containing slot. Then you wrap your listbox in a tiny slot, which you center.