added openPopupOnItemClick (#133)

src/DearImGui.hs

@@ -245,6 +245,7 @@ module DearImGui
   , Raw.endPopup
 
   , openPopup
+  , openPopupOnItemClick
   , Raw.closeCurrentPopup
 
     -- * Item/Widgets Utilities
@@ -1486,6 +1487,17 @@ openPopup :: MonadIO m => String -> m ()
 openPopup popupId = liftIO do
   withCString popupId Raw.openPopup
 
+-- | Opens a defined popup (i.e. defined with 'withPopup') on defined action.
+--
+-- Example:
+--
+-- > openPopupOnItemClick "myPopup" ImGuiPopupFlags_MouseButtonRight
+--
+-- Wraps @ImGui::OpenPopup()@
+openPopupOnItemClick :: MonadIO m => String -> ImGuiPopupFlags -> m ()
+openPopupOnItemClick popupId flags = liftIO do
+  withCString popupId $ \popupId' -> Raw.openPopupOnItemClick popupId' flags
+
 
 withCStringOrNull :: Maybe String -> (Ptr CChar -> IO a) -> IO a
 withCStringOrNull Nothing k  = k nullPtr

src/DearImGui/Raw.hs

@@ -197,6 +197,7 @@ module DearImGui.Raw
   , beginPopupModal
   , endPopup
   , openPopup
+  , openPopupOnItemClick
   , closeCurrentPopup
 
     -- * ID stack/scopes
@@ -1252,6 +1253,13 @@ openPopup :: (MonadIO m) => CString -> m ()
 openPopup popupIdPtr = liftIO do
   [C.exp| void { OpenPopup($(char* popupIdPtr)) } |]
 
+-- | Call to mark popup as open (don't call every frame!).
+--
+-- Wraps @ImGui::OpenPopupOnItemClick()@
+openPopupOnItemClick :: (MonadIO m) => CString -> ImGuiPopupFlags-> m ()
+openPopupOnItemClick popupIdPtr flags = liftIO do
+  [C.exp| void { OpenPopupOnItemClick($(char* popupIdPtr), $(ImGuiPopupFlags flags)) } |]
+
 
 -- | Manually close the popup we have begin-ed into.
 --