Button

open class Button : Widget, ButtonProtocol

The GtkButton widget is generally used to trigger a callback function that is called when the button is pressed.

An example GtkButton

The GtkButton widget can hold any valid child widget. That is, it can hold almost any other standard GtkWidget. The most commonly used child is the GtkLabel.

CSS nodes

GtkButton has a single CSS node with name button. The node will get the style classes .image-button or .text-button, if the content is just an image or label, respectively. It may also receive the .flat style class. When activating a button via the keyboard, the button will temporarily gain the .keyboard-activating style class.

Other style classes that are commonly used with GtkButton include .suggested-action and .destructive-action. In special cases, buttons can be made round by adding the .circular style class.

Button-like widgets like [classGtk.ToggleButton], [classGtk.MenuButton], [classGtk.VolumeButton], [classGtk.LockButton], [classGtk.ColorButton] or [classGtk.FontButton] use style classes such as .toggle, .popup, .scale, .lock, .color on the button node to differentiate themselves from a plain GtkButton.

Accessibility

GtkButton uses the GTK_ACCESSIBLE_ROLE_BUTTON role.

The Button type acts as a reference-counted owner of an underlying GtkButton instance. It provides the methods that can operate on this data type through ButtonProtocol conformance. Use Button as a strong reference or owner of a GtkButton instance.

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  • Designated initialiser from the underlying `C` data type.

    This creates an instance without performing an unbalanced retain i.e., ownership is transferred to the Button instance.

    Declaration

    Swift

    @inlinable
public init(_ op: UnsafeMutablePointer<GtkButton>)

    Parameters

    op

    pointer to the underlying object
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  • Designated initialiser from a constant pointer to the underlying C data type. This creates an instance without performing an unbalanced retain i.e., ownership is transferred to the Button instance.

    Declaration

    Swift

    @inlinable
public init(_ op: UnsafePointer<GtkButton>)

    Parameters

    op

    pointer to the underlying object
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  • Optional initialiser from a non-mutating gpointer to the underlying C data type. This creates an instance without performing an unbalanced retain i.e., ownership is transferred to the Button instance.

    Declaration

    Swift

    @inlinable
override public init!(gpointer op: gpointer?)

    Parameters

    op

    gpointer to the underlying object
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  • Optional initialiser from a non-mutating gconstpointer to the underlying C data type. This creates an instance without performing an unbalanced retain i.e., ownership is transferred to the Button instance.

    Declaration

    Swift

    @inlinable
override public init!(gconstpointer op: gconstpointer?)

    Parameters

    op

    pointer to the underlying object
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  • Optional initialiser from a constant pointer to the underlying C data type. This creates an instance without performing an unbalanced retain i.e., ownership is transferred to the Button instance.

    Declaration

    Swift

    @inlinable
public init!(_ op: UnsafePointer<GtkButton>?)

    Parameters

    op

    pointer to the underlying object
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  • Optional initialiser from the underlying C data type. This creates an instance without performing an unbalanced retain i.e., ownership is transferred to the Button instance.

    Declaration

    Swift

    @inlinable
public init!(_ op: UnsafeMutablePointer<GtkButton>?)

    Parameters

    op

    pointer to the underlying object
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  • Designated initialiser from the underlying C data type. Will retain GtkButton. i.e., ownership is transferred to the Button instance.

    Declaration

    Swift

    @inlinable
public init(retaining op: UnsafeMutablePointer<GtkButton>)

    Parameters

    op

    pointer to the underlying object
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  • Reference intialiser for a related type that implements ButtonProtocol Will retain GtkButton.

    Declaration

    Swift

    @inlinable
public init<T>(button other: T) where T : ButtonProtocol

    Parameters

    other

    an instance of a related type that implements ButtonProtocol
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  • Unsafe typed initialiser. Do not use unless you know the underlying data type the pointer points to conforms to ButtonProtocol.

    Declaration

    Swift

    @inlinable
override public init<T>(cPointer p: UnsafeMutablePointer<T>)

    Parameters

    cPointer

    pointer to the underlying object
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  • Unsafe typed, retaining initialiser. Do not use unless you know the underlying data type the pointer points to conforms to ButtonProtocol.

    Declaration

    Swift

    @inlinable
override public init<T>(retainingCPointer cPointer: UnsafeMutablePointer<T>)

    Parameters

    cPointer

    pointer to the underlying object
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  • Unsafe untyped initialiser. Do not use unless you know the underlying data type the pointer points to conforms to ButtonProtocol.

    Declaration

    Swift

    @inlinable
override public init(raw p: UnsafeRawPointer)

    Parameters

    p

    raw pointer to the underlying object
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  • Unsafe untyped, retaining initialiser. Do not use unless you know the underlying data type the pointer points to conforms to ButtonProtocol.

    Declaration

    Swift

    @inlinable
override public init(retainingRaw 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 ButtonProtocol.

    Declaration

    Swift

    @inlinable
public required init(raw p: UnsafeMutableRawPointer)

    Parameters

    p

    mutable raw pointer to the underlying object
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  • Unsafe untyped, retaining initialiser. Do not use unless you know the underlying data type the pointer points to conforms to ButtonProtocol.

    Declaration

    Swift

    @inlinable
required public init(retainingRaw raw: UnsafeMutableRawPointer)

    Parameters

    raw

    mutable raw pointer to the underlying object
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  • Unsafe untyped initialiser. Do not use unless you know the underlying data type the pointer points to conforms to ButtonProtocol.

    Declaration

    Swift

    @inlinable
override public init(opaquePointer p: OpaquePointer)

    Parameters

    p

    opaque pointer to the underlying object
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  • Unsafe untyped, retaining initialiser. Do not use unless you know the underlying data type the pointer points to conforms to ButtonProtocol.

    Declaration

    Swift

    @inlinable
override public init(retainingOpaquePointer p: OpaquePointer)

    Parameters

    p

    opaque pointer to the underlying object
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  • Creates a new GtkButton widget.

    To add a child widget to the button, use [methodGtk.Button.set_child].

    Declaration

    Swift

    @inlinable
public init()
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  • Creates a new button containing an icon from the current icon theme.

    If the icon name isn’t known, a “broken image” icon will be displayed instead. If the current icon theme is changed, the icon will be updated appropriately.

    Declaration

    Swift

    @inlinable
public init(iconName: UnsafePointer<CChar>? = nil)
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  • Creates a GtkButton widget with a GtkLabel child.

    Declaration

    Swift

    @inlinable
public init(label: UnsafePointer<CChar>!)
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  • Creates a new GtkButton containing a label.

    If characters in label are preceded by an underscore, they are underlined. If you need a literal underscore character in a label, use “__” (two underscores). The first underlined character represents a keyboard accelerator called a mnemonic. Pressing Alt and that key activates the button.

    Declaration

    Swift

    @inlinable
public init(mnemonic label: UnsafePointer<CChar>!)
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  • Creates a new button containing an icon from the current icon theme.

    If the icon name isn’t known, a “broken image” icon will be displayed instead. If the current icon theme is changed, the icon will be updated appropriately.

    Declaration

    Swift

    @inlinable
public static func newFrom(iconName: UnsafePointer<CChar>? = nil) -> Widget!
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  • Creates a GtkButton widget with a GtkLabel child.

    Declaration

    Swift

    @inlinable
public static func newWith(label: UnsafePointer<CChar>!) -> Widget!
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  • Creates a new GtkButton containing a label.

    If characters in label are preceded by an underscore, they are underlined. If you need a literal underscore character in a label, use “__” (two underscores). The first underlined character represents a keyboard accelerator called a mnemonic. Pressing Alt and that key activates the button.

    Declaration

    Swift

    @inlinable
public static func newWith(mnemonic label: UnsafePointer<CChar>!) -> Widget!
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