Struct DrawSession 

pub struct DrawSession { /* private fields */ }

Drawing session holding shapes plus undo/redo stacks.

Implementations

impl DrawSession

pub fn new() -> Self

pub fn shapes(&self) -> &[Shape]

pub fn add(&mut self, shape: Shape)

Add a shape; clears the redo stack.

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

Remove shape at index.

pub fn clear(&mut self)

Remove all shapes.

pub fn can_undo(&self) -> bool

pub fn can_redo(&self) -> bool

pub fn undo(&mut self) -> bool

Undo the last operation. Returns false if nothing to undo.

pub fn redo(&mut self) -> bool

Redo the last undone operation. Returns false if nothing to redo.

Trait Implementations

impl Debug for DrawSession

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

Formats the value using the given formatter.

impl Default for DrawSession

fn default() -> Self

Returns the “default value” for a type.