ScaleRef

public struct ScaleRef : ScaleProtocol, GWeakCapturing

A GtkScale is a slider control used to select a numeric value.

An example GtkScale

To use it, you’ll probably want to investigate the methods on its base class, [classGtkRange], in addition to the methods for GtkScale itself. To set the value of a scale, you would normally use [methodGtk.Range.set_value]. To detect changes to the value, you would normally use the [signalGtk.Range::value-changed] signal.

Note that using the same upper and lower bounds for the GtkScale (through the GtkRange 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&gt; elements. The “value” and “position” attributes have the same meaning as [methodGtk.Scale.add_mark] 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

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

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 [methodGtk.Scale.set_has_origin]), 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 [methodGtk.Range.set_show_fill_level]), 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 trough 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 [propertyGtk.Scale:draw-value]), there is subnode with name value. This node will get the .top or .bottom style classes similar to the marks node.

Accessibility

GtkScale uses the GTK_ACCESSIBLE_ROLE_SLIDER role.

The ScaleRef type acts as a lightweight Swift reference to an underlying GtkScale instance. It exposes methods that can operate on this data type through ScaleProtocol conformance. Use ScaleRef only as an unowned reference to an existing GtkScale instance.

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  • ptr 
    Untyped pointer to the underlying `GtkScale` instance.

    For type-safe access, use the generated, typed pointer scale_ptr property instead.

    Declaration

    Swift

    public let ptr: UnsafeMutableRawPointer!
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Scale Class

  • Designated initialiser from the underlying C data type

    Declaration

    Swift

    @inlinable
init(_ p: UnsafeMutablePointer<GtkScale>)
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  • Designated initialiser from a constant pointer to the underlying C data type

    Declaration

    Swift

    @inlinable
init(_ p: UnsafePointer<GtkScale>)
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  • Conditional initialiser from an optional pointer to the underlying C data type

    Declaration

    Swift

    @inlinable
init!(_ maybePointer: UnsafeMutablePointer<GtkScale>?)
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  • Conditional initialiser from an optional, non-mutable pointer to the underlying C data type

    Declaration

    Swift

    @inlinable
init!(_ maybePointer: UnsafePointer<GtkScale>?)
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  • Conditional initialiser from an optional gpointer

    Declaration

    Swift

    @inlinable
init!(gpointer g: gpointer?)
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  • Conditional initialiser from an optional, non-mutable gconstpointer

    Declaration

    Swift

    @inlinable
init!(gconstpointer g: gconstpointer?)
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  • Reference intialiser for a related type that implements ScaleProtocol

    Declaration

    Swift

    @inlinable
init<T>(_ other: T) where T : ScaleProtocol
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  • This factory is syntactic sugar for setting weak pointers wrapped in GWeak<T>

    Declaration

    Swift

    @inlinable
static func unowned<T>(_ other: T) -> ScaleRef where T : ScaleProtocol
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  • Unsafe typed initialiser. Do not use unless you know the underlying data type the pointer points to conforms to ScaleProtocol.

    Declaration

    Swift

    @inlinable
init<T>(cPointer: UnsafeMutablePointer<T>)
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  • Unsafe typed initialiser. Do not use unless you know the underlying data type the pointer points to conforms to ScaleProtocol.

    Declaration

    Swift

    @inlinable
init<T>(constPointer: UnsafePointer<T>)
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  • Unsafe untyped initialiser. Do not use unless you know the underlying data type the pointer points to conforms to ScaleProtocol.

    Declaration

    Swift

    @inlinable
init(mutating raw: UnsafeRawPointer)
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  • Unsafe untyped initialiser. Do not use unless you know the underlying data type the pointer points to conforms to ScaleProtocol.

    Declaration

    Swift

    @inlinable
init(raw: UnsafeMutableRawPointer)
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  • Unsafe untyped initialiser. Do not use unless you know the underlying data type the pointer points to conforms to ScaleProtocol.

    Declaration

    Swift

    @inlinable
init(opaquePointer: OpaquePointer)
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  • Creates a new GtkScale.

    Declaration

    Swift

    @inlinable
init<AdjustmentT>(orientation: GtkOrientation, adjustment: AdjustmentT?) where AdjustmentT : AdjustmentProtocol
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  • Creates a new scale widget with a range from min to max.

    The returns scale will have the given orientation and will let 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 [methodGtk.Scale.set_digits] to correct it.

    Declaration

    Swift

    @inlinable
init(range orientation: GtkOrientation, min: CDouble, max: CDouble, step: CDouble)
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  • Creates a new scale widget with a range from min to max.

    The returns scale will have the given orientation and will let 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 [methodGtk.Scale.set_digits] to correct it.

    Declaration

    Swift

    @inlinable
static func newWith(range orientation: GtkOrientation, min: CDouble, max: CDouble, step: CDouble) -> WidgetRef!
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