{-# LANGUAGE CPP #-}
-- -*-haskell-*-
--  GIMP Toolkit (GTK) Widget RadioToolButton
--
--  Author : Duncan Coutts
--
--  Created: 7 April 2005
--
--  Copyright (C) 2005 Duncan Coutts
--
--  This library is free software; you can redistribute it and/or
--  modify it under the terms of the GNU Lesser General Public
--  License as published by the Free Software Foundation; either
--  version 2.1 of the License, or (at your option) any later version.
--
--  This library is distributed in the hope that it will be useful,
--  but WITHOUT ANY WARRANTY; without even the implied warranty of
--  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
--  Lesser General Public License for more details.
--
-- |
-- Maintainer  : gtk2hs-users@lists.sourceforge.net
-- Stability   : provisional
-- Portability : portable (depends on GHC)
--
-- A toolbar item that contains a radio button
--
-- * Module available since Gtk+ version 2.4
--
module Graphics.UI.Gtk.MenuComboToolbar.RadioToolButton (
-- * Detail
--
-- | A 'RadioToolButton' is a 'ToolItem' that contains a radio button, that
-- is, a button that is part of a group of toggle buttons where only one button
-- can be active at a time.
--
-- Use 'radioToolButtonNew' to create a new 'RadioToolButton'. use
-- 'radioToolButtonNewFromWidget' to create a new 'RadioToolButton' that is
-- part of the same group as an existing 'RadioToolButton'. Use
-- 'radioToolButtonNewFromStock' or 'radioToolButtonNewWithStockFromWidget' to
-- create a new 'RadioToolButton' containing a stock item.

-- * Class Hierarchy
-- |
-- @
-- |  'GObject'
-- |   +----'Object'
-- |         +----'Widget'
-- |               +----'Container'
-- |                     +----'Bin'
-- |                           +----'ToolItem'
-- |                                 +----'ToolButton'
-- |                                       +----'ToggleToolButton'
-- |                                             +----RadioToolButton
-- @

#if GTK_CHECK_VERSION(2,4,0)
-- * Types
  RadioToolButton,
  RadioToolButtonClass,
  castToRadioToolButton, gTypeRadioToolButton,
  toRadioToolButton,

-- * Constructors
  radioToolButtonNew,
  radioToolButtonNewFromStock,
  radioToolButtonNewFromWidget,
  radioToolButtonNewWithStockFromWidget,

-- * Methods
  radioToolButtonGetGroup,
  radioToolButtonSetGroup,

-- * Attributes
  radioToolButtonGroup,
#endif
  ) where

import Control.Monad    (liftM)

import System.Glib.FFI
import System.Glib.UTFString
import System.Glib.GList
import System.Glib.Attributes
import Graphics.UI.Gtk.Abstract.Object  (makeNewObject)
{#import Graphics.UI.Gtk.Types#}
import Graphics.UI.Gtk.General.StockItems

{# context lib="gtk" prefix="gtk" #}

#if GTK_CHECK_VERSION(2,4,0)
--------------------
-- Constructors

-- | Creates a new 'RadioToolButton', creating a new group.
--
radioToolButtonNew :: IO RadioToolButton
radioToolButtonNew =
  makeNewObject mkRadioToolButton $
  liftM (castPtr :: Ptr ToolItem -> Ptr RadioToolButton) $
  {# call gtk_radio_tool_button_new #}
    nullPtr

-- | Creates a new 'RadioToolButton', creating a new group. The new
-- 'RadioToolButton' will contain an icon and label from the stock item
-- indicated by @stockId@.
--
radioToolButtonNewFromStock ::
    StockId            -- ^ @stockId@ - the name of a stock item
 -> IO RadioToolButton
radioToolButtonNewFromStock stockId =
  makeNewObject mkRadioToolButton $
  liftM (castPtr :: Ptr ToolItem -> Ptr RadioToolButton) $
  withUTFString stockId $ \stockIdPtr ->
  {# call gtk_radio_tool_button_new_from_stock #}
    nullPtr
    stockIdPtr

-- | Creates a new 'RadioToolButton' adding it to the same group as
-- the group to which @groupMember@ belongs.
--
radioToolButtonNewFromWidget :: RadioToolButtonClass groupMember =>
    groupMember        -- ^ @groupMember@ - a member of an existing radio group,
                       -- to which the new radio tool button will be added.
 -> IO RadioToolButton
radioToolButtonNewFromWidget group =
  makeNewObject mkRadioToolButton $
  liftM (castPtr :: Ptr ToolItem -> Ptr RadioToolButton) $
  {# call gtk_radio_tool_button_new_from_widget #}
    (toRadioToolButton group)

-- | Creates a new 'RadioToolButton' adding it to the same group as the group
-- to which @groupMember@ belongs. The new 'RadioToolButton' will contain an
-- icon and label from the stock item indicated by @stockId@.
--
radioToolButtonNewWithStockFromWidget :: RadioToolButtonClass groupMember =>
    groupMember        -- ^ @groupMember@ - a member of an existing radio group,
                       -- to which the new radio tool button will be added.
 -> StockId            -- ^ @stockId@ - the name of a stock item
 -> IO RadioToolButton
radioToolButtonNewWithStockFromWidget group stockId =
  makeNewObject mkRadioToolButton $
  liftM (castPtr :: Ptr ToolItem -> Ptr RadioToolButton) $
  withUTFString stockId $ \stockIdPtr ->
  {# call gtk_radio_tool_button_new_with_stock_from_widget #}
    (toRadioToolButton group)
    stockIdPtr

--------------------
-- Methods

-- | Returns the radio button group @button@ belongs to.
--
radioToolButtonGetGroup :: RadioToolButtonClass self => self
 -> IO [RadioToolButton] -- ^ returns the group the button belongs to.
radioToolButtonGetGroup self =
  {# call unsafe gtk_radio_tool_button_get_group #}
    (toRadioToolButton self)
  >>= readGSList
  >>= mapM (\elemPtr -> makeNewObject mkRadioToolButton (return elemPtr))

-- | Adds @button@ to @group@, removing it from the group it belonged to
-- before.
--
radioToolButtonSetGroup :: RadioToolButtonClass self => self
 -> RadioToolButton -- ^ @groupMember@ - a member of an existing radio group,
                    -- to which the radio tool button will be added.
 -> IO ()
radioToolButtonSetGroup self group =
  {# call unsafe gtk_radio_tool_button_get_group #} group >>= \groupGSList ->
  {# call gtk_radio_tool_button_set_group #}
    (toRadioToolButton self)
    groupGSList

--------------------
-- Properties

-- | Sets a new group for a radio tool button.
--
radioToolButtonGroup :: RadioToolButtonClass self => ReadWriteAttr self [RadioToolButton] RadioToolButton
radioToolButtonGroup = newAttr
  radioToolButtonGetGroup
  radioToolButtonSetGroup
#endif