Struct OpacityNode

pub struct OpacityNode { /* private fields */ }

A render node controlling the opacity of its single child node.

GLib type: Shared boxed type with reference counted clone semantics.

Implementations

impl OpacityNode

pub fn as_ptr(&self) -> *mut GskOpacityNode

Return the inner pointer to the underlying C value.

pub unsafe fn from_glib_ptr_borrow(ptr: &*mut GskOpacityNode) -> &Self

Borrows the underlying C value.

impl OpacityNode

pub fn new(child: impl AsRef<RenderNode>, opacity: f32) -> OpacityNode

Creates a RenderNode that will drawn the @child with reduced @opacity.

child

The node to draw

opacity

The opacity to apply

Returns

A new RenderNode

pub fn child(&self) -> RenderNode

Gets the child node that is getting opacityed by the given @self.

Returns

The child that is getting opacityed

pub fn opacity(&self) -> f32

Gets the transparency factor for an opacity node.

Returns

the opacity factor

Methods from Deref<Target = RenderNode>

pub fn as_ptr(&self) -> *mut GskRenderNode

Return the inner pointer to the underlying C value.

pub const NONE: Option<&'static RenderNode> = None

pub fn draw(&self, cr: &Context)

Draws the contents of a render node on a cairo context.

Typically, you’ll use this function to implement fallback rendering of render nodes on an intermediate Cairo context, instead of using the drawing context associated to a gdk::Surface’s rendering buffer.

For advanced nodes that cannot be supported using Cairo, in particular for nodes doing 3D operations, this function may fail.

cr

cairo context to draw to

pub fn bounds(&self) -> Rect

Retrieves the boundaries of the @self.

The node will not draw outside of its boundaries.

Returns

bounds

return location for the boundaries

pub fn node_type(&self) -> RenderNodeType

Returns the type of the render node.

Returns

the type of @self

pub fn opaque_rect(&self) -> Option<Rect>

Available on crate feature v4_16 only.

Gets an opaque rectangle inside the node that GTK can determine to be fully opaque.

There is no guarantee that this is indeed the largest opaque rectangle or that regions outside the rectangle are not opaque. This function is a best effort with that goal.

The rectangle will be fully contained in the bounds of the node.

Returns

true if part or all of the rendernode is opaque, false if no opaque region could be found.

out_opaque

return location for the opaque rect

pub fn serialize(&self) -> Bytes

Serializes the @self for later deserialization via gsk_render_node_deserialize(). No guarantees are made about the format used other than that the same version of GTK will be able to deserialize the result of a call to gsk_render_node_serialize() and gsk_render_node_deserialize() will correctly reject files it cannot open that were created with previous versions of GTK.

The intended use of this functions is testing, benchmarking and debugging. The format is not meant as a permanent storage format.

Returns

a GBytes representing the node.

pub fn write_to_file(&self, filename: impl AsRef<Path>) -> Result<(), Error>

This function is equivalent to calling serialize() followed by file_set_contents().

See those two functions for details on the arguments.

It is mostly intended for use inside a debugger to quickly dump a render node to a file for later inspection.

filename

the file to save it to

Returns

true if saving was successful

pub fn is<T: IsRenderNode>(&self) -> bool

pub fn type_(&self) -> Type

pub fn downcast_ref<T: IsRenderNode>(&self) -> Option<&T>

Trait Implementations

impl AsRef<RenderNode> for OpacityNode

fn as_ref(&self) -> &RenderNode

Converts this type into a shared reference of the (usually inferred) input type.

impl Clone for OpacityNode

fn clone(&self) -> Self

Makes a clone of this shared reference.

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

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

Performs copy-assignment from source.

impl Debug for OpacityNode

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

Formats the value using the given formatter.

impl Deref for OpacityNode

type Target = RenderNode

The resulting type after dereferencing.

fn deref(&self) -> &Self::Target

Dereferences the value.

impl<'a> FromValue<'a> for OpacityNode

Available on crate feature v4_6 only.

type Checker = GenericValueTypeOrNoneChecker<OpacityNode>

Value type checker.

unsafe fn from_value(value: &'a Value) -> Self

Get the contained value from a Value.

impl IsRenderNode for OpacityNode

const NODE_TYPE: RenderNodeType = RenderNodeType::OpacityNode

fn upcast(self) -> RenderNode

fn upcast_ref(&self) -> &RenderNode

impl StaticType for OpacityNode

fn static_type() -> Type

Returns the type identifier of Self.

impl ToValue for OpacityNode

Available on crate feature v4_6 only.

fn to_value(&self) -> Value

Convert a value to a Value.

fn value_type(&self) -> Type

Returns the type identifier of self.

impl ToValueOptional for OpacityNode

Available on crate feature v4_6 only.

fn to_value_optional(s: Option<&Self>) -> Value

Convert an Option to a Value.

impl ValueType for OpacityNode

Available on crate feature v4_6 only.

type Type = OpacityNode

Type to get the Type from.