Struct wayland_client::protocol::wl_subsurface::WlSubsurface
source · pub struct WlSubsurface { /* private fields */ }
Expand description
sub-surface interface to a wl_surface
An additional interface to a wl_surface object, which has been made a sub-surface. A sub-surface has one parent surface. A sub-surface’s size and position are not limited to that of the parent. Particularly, a sub-surface is not automatically clipped to its parent’s area.
A sub-surface becomes mapped, when a non-NULL wl_buffer is applied and the parent surface is mapped. The order of which one happens first is irrelevant. A sub-surface is hidden if the parent becomes hidden, or if a NULL wl_buffer is applied. These rules apply recursively through the tree of surfaces.
The behaviour of a wl_surface.commit request on a sub-surface depends on the sub-surface’s mode. The possible modes are synchronized and desynchronized, see methods wl_subsurface.set_sync and wl_subsurface.set_desync. Synchronized mode caches the wl_surface state to be applied when the parent’s state gets applied, and desynchronized mode applies the pending wl_surface state directly. A sub-surface is initially in the synchronized mode.
Sub-surfaces also have another kind of state, which is managed by wl_subsurface requests, as opposed to wl_surface requests. This state includes the sub-surface position relative to the parent surface (wl_subsurface.set_position), and the stacking order of the parent and its sub-surfaces (wl_subsurface.place_above and .place_below). This state is applied when the parent surface’s wl_surface state is applied, regardless of the sub-surface’s mode. As the exception, set_sync and set_desync are effective immediately.
The main surface can be thought to be always in desynchronized mode, since it does not have a parent in the sub-surfaces sense.
Even if a sub-surface is in desynchronized mode, it will behave as in synchronized mode, if its parent surface behaves as in synchronized mode. This rule is applied recursively throughout the tree of surfaces. This means, that one can set a sub-surface into synchronized mode, and then assume that all its child and grand-child sub-surfaces are synchronized, too, without explicitly setting them.
Destroying a sub-surface takes effect immediately. If you need to synchronize the removal of a sub-surface to the parent surface update, unmap the sub-surface first by attaching a NULL wl_buffer, update parent, and then destroy the sub-surface.
If the parent wl_surface object is destroyed, the sub-surface is unmapped.
This interface has no events.
Implementations§
source§impl WlSubsurface
impl WlSubsurface
sourcepub fn destroy(&self)
pub fn destroy(&self)
remove sub-surface interface
The sub-surface interface is removed from the wl_surface object that was turned into a sub-surface with a wl_subcompositor.get_subsurface request. The wl_surface’s association to the parent is deleted. The wl_surface is unmapped immediately.
sourcepub fn set_position(&self, x: i32, y: i32)
pub fn set_position(&self, x: i32, y: i32)
reposition the sub-surface
This schedules a sub-surface position change. The sub-surface will be moved so that its origin (top left corner pixel) will be at the location x, y of the parent surface coordinate system. The coordinates are not restricted to the parent surface area. Negative values are allowed.
The scheduled coordinates will take effect whenever the state of the parent surface is applied. When this happens depends on whether the parent surface is in synchronized mode or not. See wl_subsurface.set_sync and wl_subsurface.set_desync for details.
If more than one set_position request is invoked by the client before the commit of the parent surface, the position of a new request always replaces the scheduled position from any previous request.
The initial position is 0, 0.
sourcepub fn place_above(&self, sibling: &WlSurface)
pub fn place_above(&self, sibling: &WlSurface)
restack the sub-surface
This sub-surface is taken from the stack, and put back just above the reference surface, changing the z-order of the sub-surfaces. The reference surface must be one of the sibling surfaces, or the parent surface. Using any other surface, including this sub-surface, will cause a protocol error.
The z-order is double-buffered. Requests are handled in order and applied immediately to a pending state. The final pending state is copied to the active state the next time the state of the parent surface is applied. When this happens depends on whether the parent surface is in synchronized mode or not. See wl_subsurface.set_sync and wl_subsurface.set_desync for details.
A new sub-surface is initially added as the top-most in the stack of its siblings and parent.
sourcepub fn place_below(&self, sibling: &WlSurface)
pub fn place_below(&self, sibling: &WlSurface)
restack the sub-surface
The sub-surface is placed just below the reference surface. See wl_subsurface.place_above.
sourcepub fn set_sync(&self)
pub fn set_sync(&self)
set sub-surface to synchronized mode
Change the commit behaviour of the sub-surface to synchronized mode, also described as the parent dependent mode.
In synchronized mode, wl_surface.commit on a sub-surface will accumulate the committed state in a cache, but the state will not be applied and hence will not change the compositor output. The cached state is applied to the sub-surface immediately after the parent surface’s state is applied. This ensures atomic updates of the parent and all its synchronized sub-surfaces. Applying the cached state will invalidate the cache, so further parent surface commits do not (re-)apply old state.
See wl_subsurface for the recursive effect of this mode.
sourcepub fn set_desync(&self)
pub fn set_desync(&self)
set sub-surface to desynchronized mode
Change the commit behaviour of the sub-surface to desynchronized mode, also described as independent or freely running mode.
In desynchronized mode, wl_surface.commit on a sub-surface will apply the pending state directly, without caching, as happens normally with a wl_surface. Calling wl_surface.commit on the parent surface has no effect on the sub-surface’s wl_surface state. This mode allows a sub-surface to be updated on its own.
If cached state exists when wl_surface.commit is called in desynchronized mode, the pending state is added to the cached state, and applied as a whole. This invalidates the cache.
Note: even if a sub-surface is set to desynchronized, a parent sub-surface may override it to behave as synchronized. For details, see wl_subsurface.
If a surface’s parent surface behaves as desynchronized, then the cached state is applied on set_desync.
Trait Implementations§
source§impl Borrow<ObjectId> for WlSubsurface
impl Borrow<ObjectId> for WlSubsurface
source§impl Clone for WlSubsurface
impl Clone for WlSubsurface
source§fn clone(&self) -> WlSubsurface
fn clone(&self) -> WlSubsurface
1.0.0 · source§fn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
source
. Read moresource§impl Debug for WlSubsurface
impl Debug for WlSubsurface
source§impl Hash for WlSubsurface
impl Hash for WlSubsurface
source§impl PartialEq<Weak<WlSubsurface>> for WlSubsurface
impl PartialEq<Weak<WlSubsurface>> for WlSubsurface
source§impl PartialEq for WlSubsurface
impl PartialEq for WlSubsurface
source§fn eq(&self, other: &WlSubsurface) -> bool
fn eq(&self, other: &WlSubsurface) -> bool
self
and other
values to be equal, and is used
by ==
.source§impl Proxy for WlSubsurface
impl Proxy for WlSubsurface
source§fn data<U: Send + Sync + 'static>(&self) -> Option<&U>
fn data<U: Send + Sync + 'static>(&self) -> Option<&U>
source§fn object_data(&self) -> Option<&Arc<dyn ObjectData>>
fn object_data(&self) -> Option<&Arc<dyn ObjectData>>
source§fn backend(&self) -> &WeakBackend
fn backend(&self) -> &WeakBackend
source§fn send_request(&self, req: Self::Request<'_>) -> Result<(), InvalidId>
fn send_request(&self, req: Self::Request<'_>) -> Result<(), InvalidId>
source§fn send_constructor<I: Proxy>(
&self,
req: Self::Request<'_>,
data: Arc<dyn ObjectData>,
) -> Result<I, InvalidId>
fn send_constructor<I: Proxy>( &self, req: Self::Request<'_>, data: Arc<dyn ObjectData>, ) -> Result<I, InvalidId>
source§fn from_id(conn: &Connection, id: ObjectId) -> Result<Self, InvalidId>
fn from_id(conn: &Connection, id: ObjectId) -> Result<Self, InvalidId>
source§fn inert(backend: WeakBackend) -> Self
fn inert(backend: WeakBackend) -> Self
source§fn parse_event(
conn: &Connection,
msg: Message<ObjectId, OwnedFd>,
) -> Result<(Self, Self::Event), DispatchError>
fn parse_event( conn: &Connection, msg: Message<ObjectId, OwnedFd>, ) -> Result<(Self, Self::Event), DispatchError>
source§fn write_request<'a>(
&self,
conn: &Connection,
msg: Self::Request<'a>,
) -> Result<(Message<ObjectId, BorrowedFd<'a>>, Option<(&'static Interface, u32)>), InvalidId>
fn write_request<'a>( &self, conn: &Connection, msg: Self::Request<'a>, ) -> Result<(Message<ObjectId, BorrowedFd<'a>>, Option<(&'static Interface, u32)>), InvalidId>
impl Eq for WlSubsurface
Auto Trait Implementations§
impl Freeze for WlSubsurface
impl !RefUnwindSafe for WlSubsurface
impl Send for WlSubsurface
impl Sync for WlSubsurface
impl Unpin for WlSubsurface
impl !UnwindSafe for WlSubsurface
Blanket Implementations§
source§impl<T> BorrowMut<T> for Twhere
T: ?Sized,
impl<T> BorrowMut<T> for Twhere
T: ?Sized,
source§fn borrow_mut(&mut self) -> &mut T
fn borrow_mut(&mut self) -> &mut T
source§impl<T> CloneToUninit for Twhere
T: Clone,
impl<T> CloneToUninit for Twhere
T: Clone,
source§default unsafe fn clone_to_uninit(&self, dst: *mut T)
default unsafe fn clone_to_uninit(&self, dst: *mut T)
clone_to_uninit
)source§impl<T> Downcast for Twhere
T: Any,
impl<T> Downcast for Twhere
T: Any,
source§fn into_any(self: Box<T>) -> Box<dyn Any>
fn into_any(self: Box<T>) -> Box<dyn Any>
Box<dyn Trait>
(where Trait: Downcast
) to Box<dyn Any>
. Box<dyn Any>
can
then be further downcast
into Box<ConcreteType>
where ConcreteType
implements Trait
.source§fn into_any_rc(self: Rc<T>) -> Rc<dyn Any>
fn into_any_rc(self: Rc<T>) -> Rc<dyn Any>
Rc<Trait>
(where Trait: Downcast
) to Rc<Any>
. Rc<Any>
can then be
further downcast
into Rc<ConcreteType>
where ConcreteType
implements Trait
.source§fn as_any(&self) -> &(dyn Any + 'static)
fn as_any(&self) -> &(dyn Any + 'static)
&Trait
(where Trait: Downcast
) to &Any
. This is needed since Rust cannot
generate &Any
’s vtable from &Trait
’s.source§fn as_any_mut(&mut self) -> &mut (dyn Any + 'static)
fn as_any_mut(&mut self) -> &mut (dyn Any + 'static)
&mut Trait
(where Trait: Downcast
) to &Any
. This is needed since Rust cannot
generate &mut Any
’s vtable from &mut Trait
’s.