PadController

open class PadController : EventController, PadControllerProtocol

GtkPadController is an event controller for the pads found in drawing tablets (The collection of buttons and tactile sensors often found around the stylus-sensitive area).

These buttons and sensors have no implicit meaning, and by default they perform no action, this event controller is provided to map those to GAction objects, thus letting the application give those a more semantic meaning.

Buttons and sensors are not constrained to triggering a single action, some GDK_SOURCE_TABLET_PAD devices feature multiple “modes”, all these input elements have one current mode, which may determine the final action being triggered. Pad devices often divide buttons and sensors into groups, all elements in a group share the same current mode, but different groups may have different modes. See gdk_device_pad_get_n_groups() and gdk_device_pad_get_group_n_modes().

Each of the actions that a given button/strip/ring performs for a given mode is defined by GtkPadActionEntry, it contains an action name that will be looked up in the given GActionGroup and activated whenever the specified input element and mode are triggered.

A simple example of GtkPadController usage, assigning button 1 in all modes and pad devices to an “invert-selection” action:

  GtkPadActionEntry *pad_actions[] = {
    { GTK_PAD_ACTION_BUTTON, 1, -1, "Invert selection", "pad-actions.invert-selection" },
    …
  };

  …
  action_group = g_simple_action_group_new ();
  action = g_simple_action_new ("pad-actions.invert-selection", NULL);
  g_signal_connect (action, "activate", on_invert_selection_activated, NULL);
  g_action_map_add_action (G_ACTION_MAP (action_group), action);
  …
  pad_controller = gtk_pad_controller_new (window, action_group, NULL);

The actions belonging to rings/strips will be activated with a parameter of type G_VARIANT_TYPE_DOUBLE bearing the value of the given axis, it is required that those are made stateful and accepting this GVariantType.

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

    Declaration

    Swift

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

    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 PadController instance.

    Declaration

    Swift

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

    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 PadController 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 PadController 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 PadController instance.

    Declaration

    Swift

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

    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 PadController instance.

    Declaration

    Swift

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

    Parameters

    op

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

    Declaration

    Swift

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

    Parameters

    op

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

    Declaration

    Swift

    @inlinable
public init<T>(padController other: T) where T : PadControllerProtocol

    Parameters

    other

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

    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 PadControllerProtocol.

    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 PadControllerProtocol.

    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 PadControllerProtocol.

    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 PadControllerProtocol.

    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 PadControllerProtocol.

    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 PadControllerProtocol.

    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 PadControllerProtocol.

    Declaration

    Swift

    @inlinable
override public init(retainingOpaquePointer p: OpaquePointer)

    Parameters

    p

    opaque pointer to the underlying object
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  • Creates a new GtkPadController that will associate events from pad to actions. A nil pad may be provided so the controller manages all pad devices generically, it is discouraged to mix GtkPadController objects with nil and non-nil pad argument on the same window, as execution order is not guaranteed.

    The GtkPadController is created with no mapped actions. In order to map pad events to actions, use gtk_pad_controller_set_action_entries() or gtk_pad_controller_set_action().

    Declaration

    Swift

    @inlinable
public init<ActionGroupT, DeviceT, WindowT>(window: WindowT, group: ActionGroupT, pad: DeviceT?) where ActionGroupT : ActionGroupProtocol, DeviceT : DeviceProtocol, WindowT : WindowProtocol
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