#[repr(transparent)]pub struct Paintable { /* private fields */ }Expand description
Paintable is a simple interface used by GTK to represent content that
can be painted.
The content of a Paintable can be painted anywhere at any size
without requiring any sort of layout. The interface is inspired by
similar concepts elsewhere, such as
ClutterContent,
HTML/CSS Paint Sources,
or SVG Paint Servers.
A Paintable can be snapshot at any time and size using
PaintableExt::snapshot(). How the paintable interprets that size and
if it scales or centers itself into the given rectangle is implementation
defined, though if you are implementing a Paintable and don’t know what
to do, it is suggested that you scale your paintable ignoring any potential
aspect ratio.
The contents that a Paintable produces may depend on the Snapshot
passed to it. For example, paintables may decide to use more detailed images
on higher resolution screens or when OpenGL is available. A Paintable
will however always produce the same output for the same snapshot.
A Paintable may change its contents, meaning that it will now produce
a different output with the same snapshot. Once that happens, it will call
PaintableExt::invalidate_contents() which will emit the
signal::GdkPaintable::invalidate-contents signal. If a paintable is known
to never change its contents, it will set the PaintableFlags::CONTENTS
flag. If a consumer cannot deal with changing contents, it may call
PaintableExt::current_image() which will return a static
paintable and use that.
A paintable can report an intrinsic (or preferred) size or aspect ratio it
wishes to be rendered at, though it doesn’t have to. Consumers of the interface
can use this information to layout thepaintable appropriately. Just like the
contents, the size of a paintable can change. A paintable will indicate this
by calling PaintableExt::invalidate_size() which will emit the
signal::GdkPaintable::invalidate-size signal. And just like for contents,
if a paintable is known to never change its size, it will set the
PaintableFlags::SIZE flag.
Besides API for applications, there are some functions that are only
useful for implementing subclasses and should not be used by applications:
PaintableExt::invalidate_contents(),
PaintableExt::invalidate_size(),
new_empty().
Implements
Implementations§
source§impl Paintable
impl Paintable
pub const NONE: Option<&'static Paintable> = None
sourcepub fn new_empty(intrinsic_width: i32, intrinsic_height: i32) -> Paintable
pub fn new_empty(intrinsic_width: i32, intrinsic_height: i32) -> Paintable
Returns a paintable that has the given intrinsic size and draws nothing.
This is often useful for implementing the
vfunc::Gdk::Paintable::get_current_image virtual function
when the paintable is in an incomplete state (like a
Gtk::MediaStream before receiving the first frame).
intrinsic_width
The intrinsic width to report. Can be 0 for no width.
intrinsic_height
The intrinsic height to report. Can be 0 for no height.
Returns
Trait Implementations§
source§impl<T: PaintableImpl> IsImplementable<T> for Paintable
impl<T: PaintableImpl> IsImplementable<T> for Paintable
source§fn interface_init(iface: &mut Interface<Self>)
fn interface_init(iface: &mut Interface<Self>)
Override the virtual methods of this interface for the given subclass and do other
interface initialization. Read more
source§fn instance_init(_instance: &mut InitializingObject<T>)
fn instance_init(_instance: &mut InitializingObject<T>)
Instance specific initialization. Read more
source§impl Ord for Paintable
impl Ord for Paintable
source§impl<OT: ObjectType> PartialEq<OT> for Paintable
impl<OT: ObjectType> PartialEq<OT> for Paintable
source§impl<OT: ObjectType> PartialOrd<OT> for Paintable
impl<OT: ObjectType> PartialOrd<OT> for Paintable
1.0.0 · source§fn le(&self, other: &Rhs) -> bool
fn le(&self, other: &Rhs) -> bool
This method tests less than or equal to (for
self and other) and is used by the <=
operator. Read moresource§impl StaticType for Paintable
impl StaticType for Paintable
source§fn static_type() -> Type
fn static_type() -> Type
Returns the type identifier of
Self.impl Eq for Paintable
impl IsA<Paintable> for GLTexture
impl IsA<Paintable> for MemoryTexture
impl IsA<Paintable> for Texture
Auto Trait Implementations§
impl RefUnwindSafe for Paintable
impl !Send for Paintable
impl !Sync for Paintable
impl Unpin for Paintable
impl UnwindSafe for Paintable
Blanket Implementations§
source§impl<T> Cast for Twhere
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impl<T> Cast for Twhere
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