GI.Gtk.Objects.Scale

A GtkScale 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 GtkScale itself. To set the value of a scale, you would normally use rangeSetValue. To detect changes to the value, you would normally use the Range::value-changed signal.

Note that using the same upper and lower bounds for the Scale (through the Range methods) will hide the slider itself. This is useful for applications that want to show an undeterminate value on the scale, without changing the layout of the application (such as movie or music players).

GtkScale as GtkBuildable

GtkScale supports a custom <marks> element, which can contain multiple <mark> elements. The “value” and “position” attributes have the same meaning as scaleAddMark parameters of the same name. If the element is not empty, its content is taken as the markup to show at the mark. It can be translated with the usual ”translatable” and “context” attributes.

CSS nodes

plain code

scale[.fine-tune][.marks-before][.marks-after]
├── marks.top
│   ├── mark
│   ┊    ├── [label]
│   ┊    ╰── indicator
┊   ┊
│   ╰── mark
├── [value]
├── contents
│   ╰── trough
│       ├── slider
│       ├── [highlight]
│       ╰── [fill]
╰── marks.bottom
    ├── mark
    ┊    ├── indicator
    ┊    ╰── [label]
    ╰── mark

GtkScale has a main CSS node with name scale and a subnode for its contents, with subnodes named trough and slider.

The main node gets the style class .fine-tune added when the scale is in 'fine-tuning' mode.

If the scale has an origin (see scaleSetHasOrigin), there is a subnode with name highlight below the trough node that is used for rendering the highlighted part of the trough.

If the scale is showing a fill level (see rangeSetShowFillLevel), there is a subnode with name fill below the trough node that is used for rendering the filled in part of the trough.

If marks are present, there is a marks subnode before or after the contents node, below which each mark gets a node with name mark. The marks nodes get either the .top or .bottom style class.

The mark node has a subnode named indicator. If the mark has text, it also has a subnode named label. When the mark is either above or left of the scale, the label subnode is the first when present. Otherwise, the indicator subnode is the first.

The main CSS node gets the 'marks-before' and/or 'marks-after' style classes added depending on what marks are present.

If the scale is displaying the value (see Scale:draw-value), there is subnode with name value.

Exported types

newtype Scale

Constructors

Scale (ManagedPtr Scale)

Instances

GObject Scale

Methods

gobjectType :: Scale -> IO GType

IsImplementorIface Scale

IsObject Scale

IsWidget Scale

IsScale Scale

IsRange Scale

IsOrientable Scale

IsBuildable Scale

((~) * info (ResolveScaleMethod t Scale), MethodInfo * info Scale p) => IsLabel t (Scale -> p)

Methods

fromLabel :: Proxy# Symbol t -> Scale -> p

((~) * info (ResolveScaleMethod t Scale), MethodInfo * info Scale p) => IsLabelProxy t (Scale -> p)

Methods

fromLabelProxy :: Proxy Symbol t -> Scale -> p

HasAttributeList * Scale

type AttributeList Scale

type AttributeList Scale

type SignalList Scale

type SignalList Scale

class GObject o => IsScale o

Instances

(GObject a, UnknownAncestorError Constraint Scale a) => IsScale a

IsScale Scale

IsScale HScale

IsScale VScale

toScale :: IsScale o => o -> IO Scale

noScale :: Maybe Scale

Methods

addMark

data ScaleAddMarkMethodInfo

Instances

((~) * signature (Double -> PositionType -> Maybe Text -> m ()), MonadIO m, IsScale a) => MethodInfo * ScaleAddMarkMethodInfo a signature

Methods

overloadedMethod :: MethodProxy ScaleAddMarkMethodInfo a -> signature -> s

scaleAddMark

Arguments

:: (HasCallStack, MonadIO m, IsScale a)

=> a

scale: a Scale

-> Double

value: the value at which the mark is placed, must be between the lower and upper limits of the scales’ adjustment

-> PositionType

position: where to draw the mark. For a horizontal scale, GTK_POS_TOP and PositionTypeLeft are drawn above the scale, anything else below. For a vertical scale, GTK_POS_LEFT and PositionTypeTop are drawn to the left of the scale, anything else to the right.

-> Maybe Text

markup: Text to be shown at the mark, using [Pango markup][PangoMarkupFormat], or Nothing

-> m ()

Adds a mark at value.

A mark is indicated visually by drawing a tick mark next to the scale, and GTK+ makes it easy for the user to position the scale exactly at the marks value.

If markup is not Nothing, text is shown next to the tick mark.

To remove marks from a scale, use scaleClearMarks.

Since: 2.16

clearMarks

data ScaleClearMarksMethodInfo

Instances

((~) * signature (m ()), MonadIO m, IsScale a) => MethodInfo * ScaleClearMarksMethodInfo a signature

Methods

overloadedMethod :: MethodProxy ScaleClearMarksMethodInfo a -> signature -> s

scaleClearMarks

Arguments

:: (HasCallStack, MonadIO m, IsScale a)

=> a

scale: a Scale

-> m ()

Removes any marks that have been added with scaleAddMark.

Since: 2.16

getDigits

data ScaleGetDigitsMethodInfo

Instances

((~) * signature (m Int32), MonadIO m, IsScale a) => MethodInfo * ScaleGetDigitsMethodInfo a signature

Methods

overloadedMethod :: MethodProxy ScaleGetDigitsMethodInfo a -> signature -> s

scaleGetDigits

Arguments

:: (HasCallStack, MonadIO m, IsScale a)

=> a

scale: a Scale

-> m Int32

Returns: the number of decimal places that are displayed

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

getDrawValue

data ScaleGetDrawValueMethodInfo

Instances

((~) * signature (m Bool), MonadIO m, IsScale a) => MethodInfo * ScaleGetDrawValueMethodInfo a signature

Methods

overloadedMethod :: MethodProxy ScaleGetDrawValueMethodInfo a -> signature -> s

scaleGetDrawValue

Arguments

:: (HasCallStack, MonadIO m, IsScale a)

=> a

scale: a Scale

-> m 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.

getHasOrigin

data ScaleGetHasOriginMethodInfo

Instances

((~) * signature (m Bool), MonadIO m, IsScale a) => MethodInfo * ScaleGetHasOriginMethodInfo a signature

Methods

overloadedMethod :: MethodProxy ScaleGetHasOriginMethodInfo a -> signature -> s

scaleGetHasOrigin

Arguments

:: (HasCallStack, MonadIO m, IsScale a)

=> a

scale: a Scale

-> m Bool

Returns: True if the scale has an origin.

Returns whether the scale has an origin.

Since: 3.4

getLayout

data ScaleGetLayoutMethodInfo

Instances

((~) * signature (m (Maybe Layout)), MonadIO m, IsScale a) => MethodInfo * ScaleGetLayoutMethodInfo a signature

Methods

overloadedMethod :: MethodProxy ScaleGetLayoutMethodInfo a -> signature -> s

scaleGetLayout

Arguments

:: (HasCallStack, MonadIO m, IsScale a)

=> a

scale: A Scale

-> m (Maybe Layout)

Returns: the Layout for this scale, or Nothing if the Scale:draw-value property is False.

Gets the Layout used to display the scale. The returned object is owned by the scale so does not need to be freed by the caller.

Since: 2.4

getLayoutOffsets

data ScaleGetLayoutOffsetsMethodInfo

Instances

((~) * signature (m (Int32, Int32)), MonadIO m, IsScale a) => MethodInfo * ScaleGetLayoutOffsetsMethodInfo a signature

Methods

overloadedMethod :: MethodProxy ScaleGetLayoutOffsetsMethodInfo a -> signature -> s

scaleGetLayoutOffsets

Arguments

:: (HasCallStack, MonadIO m, IsScale a)

=> a

scale: a Scale

-> m (Int32, Int32)

Obtains the coordinates where the scale will draw the Layout representing the text in the scale. Remember when using the Layout function you need to convert to and from pixels using PANGO_PIXELS() or SCALE.

If the Scale:draw-value property is False, the return values are undefined.

Since: 2.4

getValuePos

data ScaleGetValuePosMethodInfo

Instances

((~) * signature (m PositionType), MonadIO m, IsScale a) => MethodInfo * ScaleGetValuePosMethodInfo a signature

Methods

overloadedMethod :: MethodProxy ScaleGetValuePosMethodInfo a -> signature -> s

scaleGetValuePos

Arguments

:: (HasCallStack, MonadIO m, IsScale a)

=> a

scale: a Scale

-> m PositionType

Returns: the position in which the current value is displayed

Gets the position in which the current value is displayed.

new

scaleNew

Arguments

:: (HasCallStack, MonadIO m, IsAdjustment a)

=> Orientation

orientation: the scale’s orientation.

-> Maybe a

adjustment: the Adjustment which sets the range of the scale, or Nothing to create a new adjustment.

-> m Scale

Returns: a new Scale

Creates a new Scale.

Since: 3.0

newWithRange

scaleNewWithRange

Arguments

:: (HasCallStack, MonadIO m)

=> Orientation

orientation: the scale’s orientation.

-> Double

min: minimum value

-> Double

max: maximum value

-> Double

step: step increment (tick size) used with keyboard shortcuts

-> m Scale

Returns: a new Scale

Creates a new scale widget with the given orientation 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 scaleSetDigits to correct it.

Since: 3.0

setDigits

data ScaleSetDigitsMethodInfo

Instances

((~) * signature (Int32 -> m ()), MonadIO m, IsScale a) => MethodInfo * ScaleSetDigitsMethodInfo a signature

Methods

overloadedMethod :: MethodProxy ScaleSetDigitsMethodInfo a -> signature -> s

scaleSetDigits

Arguments

:: (HasCallStack, MonadIO m, IsScale a)

=> a

scale: a Scale

-> Int32

digits: the number of decimal places to display, e.g. use 1 to display 1.0, 2 to display 1.00, etc

-> m ()

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.

Note that rounding to a small number of digits can interfere with the smooth autoscrolling that is built into Scale. As an alternative, you can use the Scale::format-value signal to format the displayed value yourself.

setDrawValue

data ScaleSetDrawValueMethodInfo

Instances

((~) * signature (Bool -> m ()), MonadIO m, IsScale a) => MethodInfo * ScaleSetDrawValueMethodInfo a signature

Methods

overloadedMethod :: MethodProxy ScaleSetDrawValueMethodInfo a -> signature -> s

scaleSetDrawValue

Arguments

:: (HasCallStack, MonadIO m, IsScale a)

=> a

scale: a Scale

-> Bool

drawValue: True to draw the value

-> m ()

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

setHasOrigin

data ScaleSetHasOriginMethodInfo

Instances

((~) * signature (Bool -> m ()), MonadIO m, IsScale a) => MethodInfo * ScaleSetHasOriginMethodInfo a signature

Methods

overloadedMethod :: MethodProxy ScaleSetHasOriginMethodInfo a -> signature -> s

scaleSetHasOrigin

Arguments

:: (HasCallStack, MonadIO m, IsScale a)

=> a

scale: a Scale

-> Bool

hasOrigin: True if the scale has an origin

-> m ()

If hasOrigin is set to True (the default), the scale will highlight the part of the scale between the origin (bottom or left side) of the scale and the current value.

Since: 3.4

setValuePos

data ScaleSetValuePosMethodInfo

Instances

((~) * signature (PositionType -> m ()), MonadIO m, IsScale a) => MethodInfo * ScaleSetValuePosMethodInfo a signature

Methods

overloadedMethod :: MethodProxy ScaleSetValuePosMethodInfo a -> signature -> s

scaleSetValuePos

Arguments

:: (HasCallStack, MonadIO m, IsScale a)

=> a

scale: a Scale

-> PositionType

pos: the position in which the current value is displayed

-> m ()

Sets the position in which the current value is displayed.

Properties

digits

data ScaleDigitsPropertyInfo

Instances

AttrInfo ScaleDigitsPropertyInfo

Associated Types

type AttrAllowedOps ScaleDigitsPropertyInfo :: [AttrOpTag]

type AttrSetTypeConstraint ScaleDigitsPropertyInfo :: * -> Constraint

type AttrBaseTypeConstraint ScaleDigitsPropertyInfo :: * -> Constraint

type AttrGetType ScaleDigitsPropertyInfo :: *

type AttrLabel ScaleDigitsPropertyInfo :: Symbol

type AttrOrigin ScaleDigitsPropertyInfo :: *

Methods

attrGet :: AttrBaseTypeConstraint ScaleDigitsPropertyInfo o => Proxy * ScaleDigitsPropertyInfo -> o -> IO (AttrGetType ScaleDigitsPropertyInfo)

attrSet :: (AttrBaseTypeConstraint ScaleDigitsPropertyInfo o, AttrSetTypeConstraint ScaleDigitsPropertyInfo b) => Proxy * ScaleDigitsPropertyInfo -> o -> b -> IO ()

attrClear :: AttrBaseTypeConstraint ScaleDigitsPropertyInfo o => Proxy * ScaleDigitsPropertyInfo -> o -> IO ()

attrConstruct :: (AttrBaseTypeConstraint ScaleDigitsPropertyInfo o, AttrSetTypeConstraint ScaleDigitsPropertyInfo b) => Proxy * ScaleDigitsPropertyInfo -> b -> IO (GValueConstruct o)

type AttrOrigin ScaleDigitsPropertyInfo

type AttrOrigin ScaleDigitsPropertyInfo = Scale

type AttrLabel ScaleDigitsPropertyInfo

type AttrLabel ScaleDigitsPropertyInfo = "digits"

type AttrGetType ScaleDigitsPropertyInfo

type AttrGetType ScaleDigitsPropertyInfo = Int32

type AttrBaseTypeConstraint ScaleDigitsPropertyInfo

type AttrBaseTypeConstraint ScaleDigitsPropertyInfo = IsScale

type AttrSetTypeConstraint ScaleDigitsPropertyInfo

type AttrSetTypeConstraint ScaleDigitsPropertyInfo = * ~ Int32

type AttrAllowedOps ScaleDigitsPropertyInfo

type AttrAllowedOps ScaleDigitsPropertyInfo = (:) AttrOpTag AttrSet ((:) AttrOpTag AttrConstruct ((:) AttrOpTag AttrGet ([] AttrOpTag)))

constructScaleDigits :: IsScale o => Int32 -> IO (GValueConstruct o)

getScaleDigits :: (MonadIO m, IsScale o) => o -> m Int32

scaleDigits :: AttrLabelProxy "digits"

setScaleDigits :: (MonadIO m, IsScale o) => o -> Int32 -> m ()

drawValue

data ScaleDrawValuePropertyInfo

Instances

AttrInfo ScaleDrawValuePropertyInfo

Associated Types

type AttrAllowedOps ScaleDrawValuePropertyInfo :: [AttrOpTag]

type AttrSetTypeConstraint ScaleDrawValuePropertyInfo :: * -> Constraint

type AttrBaseTypeConstraint ScaleDrawValuePropertyInfo :: * -> Constraint

type AttrGetType ScaleDrawValuePropertyInfo :: *

type AttrLabel ScaleDrawValuePropertyInfo :: Symbol

type AttrOrigin ScaleDrawValuePropertyInfo :: *

Methods

attrGet :: AttrBaseTypeConstraint ScaleDrawValuePropertyInfo o => Proxy * ScaleDrawValuePropertyInfo -> o -> IO (AttrGetType ScaleDrawValuePropertyInfo)

attrSet :: (AttrBaseTypeConstraint ScaleDrawValuePropertyInfo o, AttrSetTypeConstraint ScaleDrawValuePropertyInfo b) => Proxy * ScaleDrawValuePropertyInfo -> o -> b -> IO ()

attrClear :: AttrBaseTypeConstraint ScaleDrawValuePropertyInfo o => Proxy * ScaleDrawValuePropertyInfo -> o -> IO ()

attrConstruct :: (AttrBaseTypeConstraint ScaleDrawValuePropertyInfo o, AttrSetTypeConstraint ScaleDrawValuePropertyInfo b) => Proxy * ScaleDrawValuePropertyInfo -> b -> IO (GValueConstruct o)

type AttrOrigin ScaleDrawValuePropertyInfo

type AttrOrigin ScaleDrawValuePropertyInfo = Scale

type AttrLabel ScaleDrawValuePropertyInfo

type AttrLabel ScaleDrawValuePropertyInfo = "draw-value"

type AttrGetType ScaleDrawValuePropertyInfo

type AttrGetType ScaleDrawValuePropertyInfo = Bool

type AttrBaseTypeConstraint ScaleDrawValuePropertyInfo

type AttrBaseTypeConstraint ScaleDrawValuePropertyInfo = IsScale

type AttrSetTypeConstraint ScaleDrawValuePropertyInfo

type AttrSetTypeConstraint ScaleDrawValuePropertyInfo = * ~ Bool

type AttrAllowedOps ScaleDrawValuePropertyInfo

type AttrAllowedOps ScaleDrawValuePropertyInfo = (:) AttrOpTag AttrSet ((:) AttrOpTag AttrConstruct ((:) AttrOpTag AttrGet ([] AttrOpTag)))

constructScaleDrawValue :: IsScale o => Bool -> IO (GValueConstruct o)

getScaleDrawValue :: (MonadIO m, IsScale o) => o -> m Bool

scaleDrawValue :: AttrLabelProxy "drawValue"

setScaleDrawValue :: (MonadIO m, IsScale o) => o -> Bool -> m ()

hasOrigin

data ScaleHasOriginPropertyInfo

Instances

AttrInfo ScaleHasOriginPropertyInfo

Associated Types

type AttrAllowedOps ScaleHasOriginPropertyInfo :: [AttrOpTag]

type AttrSetTypeConstraint ScaleHasOriginPropertyInfo :: * -> Constraint

type AttrBaseTypeConstraint ScaleHasOriginPropertyInfo :: * -> Constraint

type AttrGetType ScaleHasOriginPropertyInfo :: *

type AttrLabel ScaleHasOriginPropertyInfo :: Symbol

type AttrOrigin ScaleHasOriginPropertyInfo :: *

Methods

attrGet :: AttrBaseTypeConstraint ScaleHasOriginPropertyInfo o => Proxy * ScaleHasOriginPropertyInfo -> o -> IO (AttrGetType ScaleHasOriginPropertyInfo)

attrSet :: (AttrBaseTypeConstraint ScaleHasOriginPropertyInfo o, AttrSetTypeConstraint ScaleHasOriginPropertyInfo b) => Proxy * ScaleHasOriginPropertyInfo -> o -> b -> IO ()

attrClear :: AttrBaseTypeConstraint ScaleHasOriginPropertyInfo o => Proxy * ScaleHasOriginPropertyInfo -> o -> IO ()

attrConstruct :: (AttrBaseTypeConstraint ScaleHasOriginPropertyInfo o, AttrSetTypeConstraint ScaleHasOriginPropertyInfo b) => Proxy * ScaleHasOriginPropertyInfo -> b -> IO (GValueConstruct o)

type AttrOrigin ScaleHasOriginPropertyInfo

type AttrOrigin ScaleHasOriginPropertyInfo = Scale

type AttrLabel ScaleHasOriginPropertyInfo

type AttrLabel ScaleHasOriginPropertyInfo = "has-origin"

type AttrGetType ScaleHasOriginPropertyInfo

type AttrGetType ScaleHasOriginPropertyInfo = Bool

type AttrBaseTypeConstraint ScaleHasOriginPropertyInfo

type AttrBaseTypeConstraint ScaleHasOriginPropertyInfo = IsScale

type AttrSetTypeConstraint ScaleHasOriginPropertyInfo

type AttrSetTypeConstraint ScaleHasOriginPropertyInfo = * ~ Bool

type AttrAllowedOps ScaleHasOriginPropertyInfo

type AttrAllowedOps ScaleHasOriginPropertyInfo = (:) AttrOpTag AttrSet ((:) AttrOpTag AttrConstruct ((:) AttrOpTag AttrGet ([] AttrOpTag)))

constructScaleHasOrigin :: IsScale o => Bool -> IO (GValueConstruct o)

getScaleHasOrigin :: (MonadIO m, IsScale o) => o -> m Bool

scaleHasOrigin :: AttrLabelProxy "hasOrigin"

setScaleHasOrigin :: (MonadIO m, IsScale o) => o -> Bool -> m ()

valuePos

data ScaleValuePosPropertyInfo

Instances

AttrInfo ScaleValuePosPropertyInfo

Associated Types

type AttrAllowedOps ScaleValuePosPropertyInfo :: [AttrOpTag]

type AttrSetTypeConstraint ScaleValuePosPropertyInfo :: * -> Constraint

type AttrBaseTypeConstraint ScaleValuePosPropertyInfo :: * -> Constraint

type AttrGetType ScaleValuePosPropertyInfo :: *

type AttrLabel ScaleValuePosPropertyInfo :: Symbol

type AttrOrigin ScaleValuePosPropertyInfo :: *

Methods

attrGet :: AttrBaseTypeConstraint ScaleValuePosPropertyInfo o => Proxy * ScaleValuePosPropertyInfo -> o -> IO (AttrGetType ScaleValuePosPropertyInfo)

attrSet :: (AttrBaseTypeConstraint ScaleValuePosPropertyInfo o, AttrSetTypeConstraint ScaleValuePosPropertyInfo b) => Proxy * ScaleValuePosPropertyInfo -> o -> b -> IO ()

attrClear :: AttrBaseTypeConstraint ScaleValuePosPropertyInfo o => Proxy * ScaleValuePosPropertyInfo -> o -> IO ()

attrConstruct :: (AttrBaseTypeConstraint ScaleValuePosPropertyInfo o, AttrSetTypeConstraint ScaleValuePosPropertyInfo b) => Proxy * ScaleValuePosPropertyInfo -> b -> IO (GValueConstruct o)

type AttrOrigin ScaleValuePosPropertyInfo

type AttrOrigin ScaleValuePosPropertyInfo = Scale

type AttrLabel ScaleValuePosPropertyInfo

type AttrLabel ScaleValuePosPropertyInfo = "value-pos"

type AttrGetType ScaleValuePosPropertyInfo

type AttrGetType ScaleValuePosPropertyInfo = PositionType

type AttrBaseTypeConstraint ScaleValuePosPropertyInfo

type AttrBaseTypeConstraint ScaleValuePosPropertyInfo = IsScale

type AttrSetTypeConstraint ScaleValuePosPropertyInfo

type AttrSetTypeConstraint ScaleValuePosPropertyInfo = * ~ PositionType

type AttrAllowedOps ScaleValuePosPropertyInfo

type AttrAllowedOps ScaleValuePosPropertyInfo = (:) AttrOpTag AttrSet ((:) AttrOpTag AttrConstruct ((:) AttrOpTag AttrGet ([] AttrOpTag)))

constructScaleValuePos :: IsScale o => PositionType -> IO (GValueConstruct o)

getScaleValuePos :: (MonadIO m, IsScale o) => o -> m PositionType

scaleValuePos :: AttrLabelProxy "valuePos"

setScaleValuePos :: (MonadIO m, IsScale o) => o -> PositionType -> m ()

Signals

formatValue

type C_ScaleFormatValueCallback = Ptr () -> CDouble -> Ptr () -> IO CString

type ScaleFormatValueCallback = Double -> IO Text

data ScaleFormatValueSignalInfo

Instances

SignalInfo ScaleFormatValueSignalInfo

Associated Types

type HaskellCallbackType ScaleFormatValueSignalInfo :: *

Methods

connectSignal :: GObject o => SignalProxy o ScaleFormatValueSignalInfo -> o -> HaskellCallbackType ScaleFormatValueSignalInfo -> SignalConnectMode -> IO SignalHandlerId

type HaskellCallbackType ScaleFormatValueSignalInfo

type HaskellCallbackType ScaleFormatValueSignalInfo = ScaleFormatValueCallback

afterScaleFormatValue :: (GObject a, MonadIO m) => a -> ScaleFormatValueCallback -> m SignalHandlerId

genClosure_ScaleFormatValue :: ScaleFormatValueCallback -> IO Closure

mk_ScaleFormatValueCallback :: C_ScaleFormatValueCallback -> IO (FunPtr C_ScaleFormatValueCallback)

noScaleFormatValueCallback :: Maybe ScaleFormatValueCallback

onScaleFormatValue :: (GObject a, MonadIO m) => a -> ScaleFormatValueCallback -> m SignalHandlerId

wrap_ScaleFormatValueCallback :: ScaleFormatValueCallback -> Ptr () -> CDouble -> Ptr () -> IO CString