public int OnClick(TfLBIClick click, POINT pt, [NativeTypeName("const RECT *")] RECT *prcArea) { return(((delegate * unmanaged <ITfLangBarItemButton *, TfLBIClick, POINT, RECT *, int>)(lpVtbl[7]))((ITfLangBarItemButton *)Unsafe.AsPointer(ref this), click, pt, prcArea)); }
HRESULT ITfLangBarItemButton.OnClick(TfLBIClick click, POINT pt, in RECT prcArea) => HRESULT.S_OK;