Struct PadController 

pub struct PadController { /* private fields */ }

PadController 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 PadActionEntry, it contains an action name that will be looked up in the given gio::ActionGroup 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:

  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 glib::VariantType.

Properties

action-group

Readable | Writable | Construct Only

pad

Readable | Writable | Construct Only

EventController

propagation-phase

The propagation phase at which this controller will handle events.

Readable | Writable

widget

The widget receiving the GdkEvents that the controller will handle.

Readable | Writable | Construct Only

Implements

EventControllerExt, [trait@glib::ObjectExt]

GLib type: GObject with reference counted clone semantics.

Implementations

impl PadController

pub fn new( window: &impl IsA<Window>, group: &impl IsA<ActionGroup>, pad: Option<&Device>, ) -> PadController

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 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().

window

a Window

group

gio::ActionGroup to trigger actions from

pad

A GDK_SOURCE_TABLET_PAD device, or None to handle all pads

Returns

A newly created PadController

pub fn builder() -> PadControllerBuilder

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.

pub fn set_action( &self, type_: PadActionType, index: i32, mode: i32, label: &str, action_name: &str, )

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

pub fn action_group(&self) -> Option<ActionGroup>

pub fn pad(&self) -> Option<Device>

impl PadController

pub fn set_action_entries(&self, entries: &[PadActionEntry])

This is 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

Trait Implementations

impl Clone for PadController

fn clone(&self) -> Self

Makes a clone of this shared reference.

This increments the strong reference count of the object. Dropping the object will decrement it again.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for PadController

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for PadController

fn default() -> Self

Returns the “default value” for a type.

impl Eq for PadController

impl HasParamSpec for PadController

type ParamSpec = ParamSpecObject

type SetValue = PadController

Preferred value to be used as setter for the associated ParamSpec.

type BuilderFn = fn(&str) -> ParamSpecObjectBuilder<'_, PadController>

fn param_spec_builder() -> Self::BuilderFn

impl Hash for PadController

fn hash<H>(&self, state: &mut H)

where H: Hasher,

Hashes the memory address of this object.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl IsA<EventController> for PadController

impl Ord for PadController

fn cmp(&self, other: &Self) -> Ordering

Comparison for two GObjects.

Compares the memory addresses of the provided objects.

fn max(self, other: Self) -> Self

where Self: Sized,

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

where Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

where Self: Sized,

Restrict a value to a certain interval.

impl ParentClassIs for PadController

type Parent = EventController

impl<OT: ObjectType> PartialEq<OT> for PadController

fn eq(&self, other: &OT) -> bool

Equality for two GObjects.

Two GObjects are equal if their memory addresses are equal.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl<OT: ObjectType> PartialOrd<OT> for PadController

fn partial_cmp(&self, other: &OT) -> Option<Ordering>

Partial comparison for two GObjects.

Compares the memory addresses of the provided objects.

fn lt(&self, other: &Rhs) -> bool

Tests less than (for self and other) and is used by the < operator.

fn le(&self, other: &Rhs) -> bool

Tests less than or equal to (for self and other) and is used by the <= operator.

fn gt(&self, other: &Rhs) -> bool

Tests greater than (for self and other) and is used by the > operator.

fn ge(&self, other: &Rhs) -> bool

Tests greater than or equal to (for self and other) and is used by the >= operator.

impl StaticType for PadController

fn static_type() -> Type

Returns the type identifier of Self.