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|
-- -*-haskell-*-
-- GIMP Toolkit (GTK) Widget Bin
--
-- Author : Duncan Coutts
--
-- Created: 25 April 2004
--
-- Copyright (C) 2004-2005 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 container with just one child
--
module Graphics.UI.Gtk.Abstract.Bin (
-- * Detail
--
-- | The 'Bin' widget is a container with just one child. It is not very
-- useful itself, but it is useful for deriving subclasses, since it provides
-- common code needed for handling a single child widget.
--
-- Many Gtk+ widgets are subclasses of 'Bin', including 'Window', 'Button',
-- 'Frame', 'HandleBox', and 'ScrolledWindow'.
-- * Class Hierarchy
-- |
-- @
-- | 'GObject'
-- | +----'Object'
-- | +----'Widget'
-- | +----'Container'
-- | +----Bin
-- | +----'Window'
-- | +----'Alignment'
-- | +----'Frame'
-- | +----'Button'
-- | +----'Item'
-- | +----'ComboBox'
-- | +----'EventBox'
-- | +----'Expander'
-- | +----'HandleBox'
-- | +----'ToolItem'
-- | +----'ScrolledWindow'
-- | +----'Viewport'
-- @
-- * Types
Bin,
BinClass,
castToBin, gTypeBin,
toBin,
-- * Methods
binGetChild,
) where
import System.Glib.FFI
import Graphics.UI.Gtk.Abstract.Object (makeNewObject)
{#import Graphics.UI.Gtk.Types#}
{# context lib="gtk" prefix="gtk" #}
--------------------
-- Methods
-- | Gets the child of the 'Bin', or @Nothing@ if the bin contains no child
-- widget.
--
binGetChild :: BinClass self => self
-> IO (Maybe Widget) -- ^ returns pointer to child of the 'Bin'
binGetChild self =
maybeNull (makeNewObject mkWidget) $
{# call gtk_bin_get_child #}
(toBin self)
|
