Add DearImGui.withCloseableWindow

src/DearImGui.hs

@@ -45,6 +45,7 @@ module DearImGui
     -- * Windows
   , withWindow
   , withWindowOpen
+  , withCloseableWindow
   , withFullscreen
   , fullscreenFlags
 
@@ -416,6 +417,26 @@ withWindowOpen :: MonadUnliftIO m => Text -> m () -> m ()
 withWindowOpen name action =
   withWindow name (`when` action)
 
+-- | Append items to a closeable window unless it is collapsed or fully clipped.
+--
+-- You may append multiple times to the same window during the same frame
+-- by calling 'withWindowOpen' in multiple places.
+--
+-- The 'Bool' state variable will be set to 'False' when the window's close
+-- button is pressed.
+withCloseableWindow :: (HasSetter ref Bool, MonadUnliftIO m) => Text -> ref -> m () -> m ()
+withCloseableWindow name ref action = bracket open close (`when` action)
+  where
+    open = liftIO do
+      with 1 \boolPtr -> do
+        Text.withCString name \namePtr -> do
+          isVisible <- Raw.begin namePtr (Just boolPtr) Nothing
+          isOpen <- peek boolPtr
+          when (isOpen == 0) $ ref $=! False
+          pure isVisible
+
+    close = liftIO . const Raw.end
+
 -- | Append items to a fullscreen window.
 --
 -- The action runs inside a window that is set to behave as a backdrop.