Graphics.UI.Gtk.Abstract.Scale

gtk-0.12.4: Binding to the Gtk+ graphical user interface library.

Portability | portable (depends on GHC)
Stability | provisional
Maintainer | gtk2hs-users@lists.sourceforge.net
Safe Haskell | None

Graphics.UI.Gtk.Abstract.Scale

Contents

- Detail
- Class Hierarchy
- Types
- Methods
- Attributes

Description

Base class for `HScale` and `VScale`

Synopsis

- data Scale
- class RangeClass o => ScaleClass o
- castToScale :: GObjectClass obj => obj -> Scale
- gTypeScale :: GType
- toScale :: ScaleClass o => o -> Scale
- scaleSetDigits :: ScaleClass self => self -> Int -> IO ()
- scaleGetDigits :: ScaleClass self => self -> IO Int
- scaleSetDrawValue :: ScaleClass self => self -> Bool -> IO ()
- scaleGetDrawValue :: ScaleClass self => self -> IO Bool
- data PositionType
  - = PosLeft
  - | PosRight
  - | PosTop
  - | PosBottom
- scaleSetValuePos :: ScaleClass self => self -> PositionType -> IO ()
- scaleGetValuePos :: ScaleClass self => self -> IO PositionType
- scaleDigits :: ScaleClass self => Attr self Int
- scaleDrawValue :: ScaleClass self => Attr self Bool
- scaleValuePos :: ScaleClass self => Attr self PositionType

# Detail

A `Scale` is a slider control used to select a numeric value. To use it, you'll probably want to investigate the methods on its base class, `Range`, in addition to the methods for `Scale` itself. To set the value of a scale, you would normally use `rangeSetValue`. To detect changes to the value, you would normally use the `onRangeValueChanged` signal.

The `Scale` widget is an abstract class, used only for deriving the subclasses `HScale` and `VScale`. To create a scale widget, call `hScaleNewWithRange` or `vScaleNewWithRange`.

# Class Hierarchy

     | GObject
     | +----Object
     | +----Widget
     | +----Range
     | +----Scale
     | +----HScale
     | +----VScale

# Types

data Scale

Instances

Eq Scale |
Ord Scale |
GObjectClass Scale |
ScaleClass Scale |
RangeClass Scale |
WidgetClass Scale |
ObjectClass Scale |

class RangeClass o => ScaleClass o

Instances

ScaleClass VScale |
ScaleClass HScale |
ScaleClass Scale |

castToScale :: GObjectClass obj => obj -> Scale

gTypeScale :: GType

toScale :: ScaleClass o => o -> Scale

# Methods

scaleSetDigits

Arguments

:: ScaleClass self |
=> self |
-> Int | `digits` - the number of decimal places to display, e.g. use 1 to display 1.0, 2 to display 1.00 etc.
-> IO () |

Sets the number of decimal places that are displayed in the value. Also causes the value of the adjustment to be rounded off to this number of digits, so the retrieved value matches the value the user saw.

scaleGetDigits

Arguments

:: ScaleClass self |
=> self |
-> IO Int | returns the number of decimal places that are displayed.

Gets the number of decimal places that are displayed in the value.

scaleSetDrawValue

Arguments

:: ScaleClass self |
=> self |
-> Bool | `drawValue` - a boolean.
-> IO () |

Specifies whether the current value is displayed as a string next to the slider.

scaleGetDrawValue

Arguments

:: ScaleClass self |
=> self |
-> IO Bool | returns whether the current value is displayed as a string.

Returns whether the current value is displayed as a string next to the slider.

data PositionType

Position a scale's value is drawn relative to the trough

Constructors

PosLeft |
PosRight |
PosTop |
PosBottom |

Instances

Enum PositionType |
Eq PositionType |
Show PositionType |

scaleSetValuePos

Arguments

:: ScaleClass self |
=> self |
-> PositionType | `pos` - the position in which the current value is displayed.
-> IO () |

Sets the position in which the current value is displayed.

scaleGetValuePos

Arguments

:: ScaleClass self |
=> self |
-> IO PositionType | returns the position in which the current value is displayed.

Gets the position in which the current value is displayed.

# Attributes

scaleDigits :: ScaleClass self => Attr self Int

The number of decimal places that are displayed in the value.

Allowed values: [-1,64]

Default value: 1

scaleDrawValue :: ScaleClass self => Attr self Bool

Whether the current value is displayed as a string next to the slider.

Default value: `True`

scaleValuePos :: ScaleClass self => Attr self PositionType

The position in which the current value is displayed.

Default value: `PosTop`