require 'phi'
require 'rgui/ui'

form = RGUI::Form.new(:form1, 'formです')

btn1 = Phi::Button.new(form, :button1, 'その1')
btn2 = Phi::Button.new(form, :button2, 'その2')
btn3 = Phi::Button.new(form, :button3, 'その3')

hbox = UI::Hbox.new([btn1, btn2, btn3], 10)

form.add(hbox)
  
btn1.on_click = proc do
  form.layout
end

btn2.on_click = proc do
  form.layout
end

btn3.on_click = proc do
  form.layout
end
form.show
Phi.mainloop