PadController
GtkPadController
is an event controller for the pads found in drawing tablets.
Pads are 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. GtkPadController
is provided to map those to iface@Gio.Action objects, thus letting the application give them 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 method@Gdk.DevicePad.get_n_groups and method@Gdk.DevicePad.get_group_n_modes.
Each of the actions that a given button/strip/ring performs for a given mode is defined by a struct@Gtk.PadActionEntry. It contains an action name that will be looked up in the given iface@Gio.ActionGroup 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 (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
.
Skipped during bindings generation
parameter
entries
: PadActionEntrymethod
action-group
: Property has no getter nor settermethod
pad
: Property has no getter nor setter
Constructors
Properties
Functions
Returns the event that is currently being handled by the controller.
Returns the device of the event that is currently being handled by the controller.
Returns the modifier state of the event that is currently being handled by the controller.
Returns the timestamp of the event that is currently being handled by the controller.
Adds an individual action to @controller.
Sets a name on the controller that can be used for debugging.