Struct gtk4::PadController[][src]

pub struct PadController(_);
Expand description

PadController 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. PadController is provided to map those to GAction 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 Gdk::DevicePad::get_n_groups() and `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 PadActionEntry. 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 PadController usage: Assigning button 1 in all modes and pad devices to an “invert-selection” action:

⚠️ The following code is in c ⚠️

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.

Implements

EventControllerExt, glib::ObjectExt

Implementations

Creates a new PadController that will associate events from pad to actions.

A None pad may be provided so the controller manages all pad devices generically, it is discouraged to mix PadController objects with None and non-None pad argument on the same toplevel window, as execution order is not guaranteed.

The PadController is created with no mapped actions. In order to map pad events to actions, use set_action_entries() or set_action().

Be aware that pad events will only be delivered to Windows, so adding a pad controller to any other type of widget will not have an effect.

group

GActionGroup to trigger actions from

pad

A GDK_SOURCE_TABLET_PAD device, or None to handle all pads

Returns

A newly created PadController

Creates a new builder-pattern struct instance to construct PadController objects.

This method returns an instance of PadControllerBuilder which can be used to create PadController objects.

Adds an individual action to self.

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.

The given label should be considered user-visible, so internationalization rules apply. Some windowing systems may be able to use those for user feedback.

type_

the type of pad feature that will trigger this action

index

the 0-indexed button/ring/strip number that will trigger this action

mode

the mode that will trigger this action, or -1 for all modes.

label

Human readable description of this action, this string should be deemed user-visible.

action_name

action name that will be activated in the gio::ActionGroup

A convenience function to add a group of action entries on self.

See PadActionEntry and set_action().

entries

the action entries to set on self

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