Struct gtk4::WidgetPaintable

pub struct WidgetPaintable { /* private fields */ }

WidgetPaintable is a gdk::Paintable that displays the contents of a widget.

WidgetPaintable will also take care of the widget not being in a state where it can be drawn (like when it isn’t shown) and just draw nothing or where it does not have a size (like when it is hidden) and report no size in that case.

Of course, WidgetPaintable allows you to monitor widgets for size changes by emitting the invalidate-size signal whenever the size of the widget changes as well as for visual changes by emitting the invalidate-contents signal whenever the widget changes.

You can use a WidgetPaintable everywhere a gdk::Paintable is allowed, including using it on a Picture (or one of its parents) that it was set on itself via gtk_picture_set_paintable(). The paintable will take care of recursion when this happens. If you do this however, ensure that the can-shrink property is set to true or you might end up with an infinitely growing widget.

Properties

widget

The observed widget or None if none.

Readable | Writeable

Implements

[trait@glib::ObjectExt], gdk::prelude::PaintableExt

Implementations

impl WidgetPaintable

pub fn new(widget: Option<&impl IsA<Widget>>) -> WidgetPaintable

Creates a new widget paintable observing the given widget.

widget

a Widget

Returns

a new WidgetPaintable

pub fn widget(&self) -> Option<Widget>

Returns the widget that is observed or None if none.

Returns

the observed widget.

pub fn set_widget(&self, widget: Option<&impl IsA<Widget>>)

Sets the widget that should be observed.

widget

the widget to observe

pub fn connect_widget_notify<F: Fn(&Self) + 'static>( &self, f: F ) -> SignalHandlerId

Trait Implementations

impl Clone for WidgetPaintable

fn clone(&self) -> Self

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for WidgetPaintable

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

Formats the value using the given formatter.

impl HasParamSpec for WidgetPaintable

type ParamSpec = ParamSpecObject

type SetValue = WidgetPaintable

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

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

fn param_spec_builder() -> Self::BuilderFn

impl Hash for WidgetPaintable

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

where H: Hasher,

Feeds this value into the given Hasher.

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 Ord for WidgetPaintable

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

This method returns an Ordering between self and other.

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 + PartialOrd,

Restrict a value to a certain interval.

impl ParentClassIs for WidgetPaintable

type Parent = Object

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

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

This method tests for self and other values to be equal, and is used by ==.

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

This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

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

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

This method returns an ordering between self and other values if one exists.

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

This method tests less than (for self and other) and is used by the < operator.

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

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

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

This method tests greater than (for self and other) and is used by the > operator.

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

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

impl StaticType for WidgetPaintable

fn static_type() -> Type

Returns the type identifier of Self.

impl Eq for WidgetPaintable

impl IsA<Paintable> for WidgetPaintable