Description [src]

final class Gtk.PadController : Gtk.EventController
  /* No available fields */

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.


hierarchy this GtkPadController ancestor_0 GtkEventController ancestor_0--this ancestor_1 GObject ancestor_1--ancestor_0



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

since: 3.22

Instance methods


Adds an individual action to controller. This action will only be activated if the given button/ring/strip number in index is interacted while the current mode is mode. -1 may be used for simple cases, so the action is triggered on all modes.

since: 3.22


This is a convenience function to add a group of action entries on controller. See GtkPadActionEntry and gtk_pad_controller_set_action().

since: 3.22

Methods inherited from GtkEventController (5)

Gets the propagation phase at which controller handles events.

since: 3.14


Returns the GtkWidget this controller relates to.

since: 3.14


Feeds an events into controller, so it can be interpreted and the controller actions triggered.

since: 3.14


Resets the controller to a clean state. Every interaction the controller did through GtkEventController::handle-event will be dropped at this point.

since: 3.14


Sets the propagation phase at which a controller handles events.

since: 3.14

Methods inherited from GObject (43)

Please see GObject for a full list of methods.


No description available.

No description available.

Properties inherited from GtkEventController (2)

The propagation phase at which this controller will handle events.

since: 3.14


The widget receiving the GdkEvents that the controller will handle.

since: 3.14


Signals inherited from GObject (1)

The notify signal is emitted on an object when one of its properties has its value set through g_object_set_property(), g_object_set(), et al.

Class structure

struct GtkPadControllerClass {
  /* no available fields */

No description available.