Data commit

Task/Simple-windowed-application/Haskell/simple-windowed-application.hs

@@ -0,0 +1,30 @@
+import Graphics.UI.Gtk
+import Data.IORef
+
+main :: IO ()
+main = do
+  initGUI
+  window <- windowNew
+  window `onDestroy` mainQuit
+  windowSetTitle window "Simple Windowed App"
+  set window [ containerBorderWidth := 10 ]
+
+  hbox <- hBoxNew True 5
+
+  set window [ containerChild := hbox ]
+
+  lab <- labelNew (Just "There have been no clicks yet")
+  button <- buttonNewWithLabel "Click me"
+  set hbox [ containerChild := lab ]
+  set hbox [ containerChild := button ]
+
+  m <- newIORef 0
+
+  onClicked button $ do
+    v <- readIORef m
+    writeIORef m (v+1)
+    set lab [ labelText := "There have been " ++ show (v+1) ++ " clicks" ]
+
+  widgetShowAll window
+
+  mainGUI