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haskellwxhaskell

change wxhaskell layout programmatically

I want to switch layouts after an event (ie click on button). So I set the new layout and repaint the panel, but the layout doesn't change. (It does so only after I resize the frame by hand.) What's the magic sauce that's missing? Thank's for helping me out!

import Graphics.UI.WX

buildGUI = do
  f <- frame [ text := "Hello" ]

  controls <- panel f []
  ctext <- staticText controls [ text := "Foo" ]
  butn <- button controls [text := "change layout"]
  set controls [ layout := row 0 [margin 5 (widget ctext),
                                  margin 5 (widget butn) ]]

  set f [ layout := widget controls ]

  set butn [on command := do
      -- switch layout, button first, text second
      set controls [layout := row 0 [ margin 5 (widget butn)
                                    , margin 5 (widget ctext) ]]
  {-
     repaint doesn't do it, but if I resize the frame by hand,
     the layout changes
  -}    
      repaint controls         ]

  return ()

main = start buildGUI
Solution

  • I found the answer myself after googeling with MathematicalOrchid's comment in mind. The function is called refit.