Add support for disabled blocks (#196)

src/DearImGui.hs

@@ -279,6 +279,11 @@ module DearImGui
   , Raw.beginTooltip
   , Raw.endTooltip
 
+    -- ** Disabled blocks
+  , withDisabled
+  , Raw.beginDisabled
+  , Raw.endDisabled
+
     -- * Popups/Modals
 
     -- ** Generic
@@ -1763,6 +1768,17 @@ setTabItemClosed tabName = liftIO do
 withTooltip ::  MonadUnliftIO m => m a -> m a
 withTooltip = bracket_ Raw.beginTooltip Raw.endTooltip
 
+
+-- | Action wrapper for disabled blocks.
+--
+-- See 'Raw.beginDisabled' and 'Raw.endDisabled' for more info.
+withDisabled :: (MonadUnliftIO m, HasGetter ref Bool) => ref -> m a -> m a
+withDisabled disabledRef action = do
+  disabled <- get disabledRef
+  if disabled then bracket_ (Raw.beginDisabled 1) Raw.endDisabled action else action
+
+
+
 -- | Returns 'True' if the popup is open, and you can start outputting to it.
 --
 -- Wraps @ImGui::BeginPopup()@

src/DearImGui/Raw.hs

@@ -65,6 +65,8 @@ module DearImGui.Raw
   , setNextWindowSizeConstraints
   , setNextWindowCollapsed
   , setNextWindowBgAlpha
+  , beginDisabled
+  , endDisabled
 
     -- ** Child Windows
   , beginChild
@@ -1582,6 +1584,29 @@ setNextWindowBgAlpha alpha = liftIO do
   [C.exp| void { SetNextWindowBgAlpha($(float alpha)) } |]
 
 
+-- | Begin a block that may be disabled. This disables all user interactions
+-- and dims item visuals.
+--
+-- Always call a matching 'endDisabled' for each 'beginDisabled' call.
+--
+-- The boolean argument is only intended to facilitate use of boolean
+-- expressions. If you can avoid calling @beginDisabled 0@ altogether,
+-- that should be preferred.
+--
+-- Wraps @ImGui::BeginDisabled()@
+beginDisabled :: (MonadIO m) => CBool -> m ()
+beginDisabled disabled = liftIO do
+  [C.exp| void { BeginDisabled($(bool disabled)) } |]
+
+
+-- | Ends a block that may be disabled.
+--
+-- Wraps @ImGui::EndDisabled()@
+endDisabled :: (MonadIO m) => m ()
+endDisabled = liftIO do
+  [C.exp| void { EndDisabled() } |]
+
+
 -- | undo a sameLine or force a new line when in an horizontal-layout context.
 --
 -- Wraps @ImGui::NewLine()@