Struct Wells 

pub struct Wells { /* private fields */ }

Where the wells of a tree on this thread report, shared with the window policy that places the windows they stand for: the same handle, so a well that moves moves its window.

A host that shows a shell’s views in the compositor’s process installs one handle (install) before it lays the tree out; the well reports into it on every layout. With none installed, a well reports nowhere and costs one thread-local read.

Implementations

impl Wells

pub fn new() -> Wells

A handle with no well on it.

pub fn well(&self, place: &str) -> Option<Rect>

Where the well of place place stands, in the layout’s logical coordinates, as of the last layout that placed it.

pub fn wells(&self) -> BTreeMap<String, Rect>

Every well on screen, by place, as of the last layout.

pub fn is_empty(&self) -> bool

Whether any well stands on a tree at all: empty after a layout that placed none.

pub fn generation(&self) -> u64

Moves with every layout that placed a well, so a reader of Self::well knows whether the last answer still stands: a canvas pan, a scroll and a resize each move it.

pub fn place(&self, place: &str, rect: Rect)

Record rect as the well of place.

pub fn remove(&self, place: &str)

Forget the well of place: it left the screen (its place scrolled away, or the shell shows another workspace and does not draw it).

pub fn clear(&self)

Forget every well: a layout that placed none leaves nothing on screen.

Trait Implementations

impl Clone for Wells

fn clone(&self) -> Wells

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Default for Wells

fn default() -> Wells

Returns the “default value” for a type.