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|
-- -*-haskell-*-
-- GIMP Toolkit (GTK) Widget HScale
--
-- Author : Axel Simon
--
-- Created: 23 May 2001
--
-- Copyright (C) 1999-2005 Axel Simon
--
-- 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 horizontal slider widget for selecting a value from a range
--
module Graphics.UI.Gtk.Entry.HScale (
-- * Detail
--
-- | The 'HScale' widget is used to allow the user to select a value using a
-- horizontal slider. To create one, use 'hScaleNewWithRange'.
--
-- The position to show the current value, and the number of decimal places
-- shown can be set using the parent 'Scale' class's functions.
-- * Class Hierarchy
-- |
-- @
-- | 'GObject'
-- | +----'Object'
-- | +----'Widget'
-- | +----'Range'
-- | +----'Scale'
-- | +----HScale
-- @
-- * Types
HScale,
HScaleClass,
castToHScale, gTypeHScale,
toHScale,
-- * Constructors
hScaleNew,
hScaleNewWithRange,
) where
import Control.Monad (liftM)
import System.Glib.FFI
import Graphics.UI.Gtk.Abstract.Object (makeNewObject)
{#import Graphics.UI.Gtk.Types#}
{# context lib="gtk" prefix="gtk" #}
--------------------
-- Constructors
-- | Creates a new 'HScale'.
--
hScaleNew ::
Adjustment -- ^ @adjustment@ - the 'Adjustment' which sets the range of
-- the scale.
-> IO HScale
hScaleNew adjustment =
makeNewObject mkHScale $
liftM (castPtr :: Ptr Widget -> Ptr HScale) $
{# call unsafe hscale_new #}
adjustment
-- | Creates a new horizontal scale widget that lets the user input a number
-- between @min@ and @max@ (including @min@ and @max@) with the increment
-- @step@. @step@ must be nonzero; it's the distance the slider moves when
-- using the arrow keys to adjust the scale value.
--
-- Note that the way in which the precision is derived works best if @step@
-- is a power of ten. If the resulting precision is not suitable for your
-- needs, use 'Graphics.UI.Gtk.Abstract.Scale.scaleSetDigits' to correct it.
--
hScaleNewWithRange ::
Double -- ^ @min@ - minimum value
-> Double -- ^ @max@ - maximum value
-> Double -- ^ @step@ - step increment (tick size) used with keyboard
-- shortcuts
-> IO HScale
hScaleNewWithRange min max step =
makeNewObject mkHScale $
liftM (castPtr :: Ptr Widget -> Ptr HScale) $
{# call unsafe hscale_new_with_range #}
(realToFrac min)
(realToFrac max)
(realToFrac step)
|
