Struct LayerStack 

pub struct LayerStack { /* private fields */ }

An ordered stack of map layers, rendered bottom-to-top.

Implementations

impl LayerStack

pub fn new() -> Self

Create an empty layer stack.

pub fn from_vec(layers: Vec<Box<dyn Layer>>) -> Self

Create a layer stack from an existing vector of layers.

pub fn push(&mut self, layer: Box<dyn Layer>)

Add a layer on top of the stack.

pub fn insert(&mut self, index: usize, layer: Box<dyn Layer>)

Insert a layer at a specific index (0 = bottom).

pub fn remove(&mut self, index: usize) -> Option<Box<dyn Layer>>

Remove a layer by index. Returns it if valid.

pub fn remove_by_name(&mut self, name: &str) -> Option<Box<dyn Layer>>

Remove a layer by name. Returns it if found.

pub fn move_up(&mut self, index: usize) -> bool

Move a layer up (toward the top of the stack / rendered last).

Returns true if the layer was moved.

pub fn move_down(&mut self, index: usize) -> bool

Move a layer down (toward the bottom of the stack / rendered first).

Returns true if the layer was moved.

pub fn index_of(&self, name: &str) -> Option<usize>

Find a layer by name and return its index.

pub fn get(&self, index: usize) -> Option<&dyn Layer>

Get a layer by index.

pub fn get_mut(&mut self, index: usize) -> Option<&mut Box<dyn Layer>>

Get a layer mutably by index.

pub fn len(&self) -> usize

Number of layers.

pub fn is_empty(&self) -> bool

Whether there are no layers.

pub fn iter(&self) -> impl Iterator<Item = &dyn Layer> + '_

Iterate layers bottom-to-top.

pub fn iter_mut(&mut self) -> IterMut<'_, Box<dyn Layer>>

Iterate layers mutably.

Trait Implementations

impl Default for LayerStack

fn default() -> Self

Returns the “default value” for a type.