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use scene::Project;
use crate::command::{Command, CommandError, CommandResult};
#[derive(Default)]
pub struct CommandHistory {
history: Vec<Box<dyn Command>>,
redo_stack: Vec<Box<dyn Command>>,
}
impl CommandHistory {
pub fn new() -> Self {
Self::default()
}
pub fn execute(
&mut self,
mut command: Box<dyn Command>,
project: &mut Project,
) -> Result<Option<CommandResult>, CommandError> {
let result = command.execute(project)?;
self.history.push(command);
self.redo_stack.clear();
Ok(result)
}
pub fn push(&mut self, command: Box<dyn Command>) {
self.history.push(command);
self.redo_stack.clear();
}
pub fn undo(&mut self, project: &mut Project) {
let Some(mut command) = self.history.pop() else {
return;
};
command.undo(project);
self.redo_stack.push(command);
}
pub fn redo(
&mut self,
project: &mut Project,
) -> Result<Option<CommandResult>, CommandError> {
let Some(mut command) = self.redo_stack.pop() else {
return Ok(None);
};
let result = command.redo(project)?;
self.history.push(command);
Ok(result)
}
pub fn can_undo(&self) -> bool {
!self.history.is_empty()
}
pub fn can_redo(&self) -> bool {
!self.redo_stack.is_empty()
}
pub fn len(&self) -> usize {
self.history.len()
}
pub fn clear(&mut self) {
self.history.clear();
self.redo_stack.clear();
}
}
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