54 lines
1.0 KiB
Rust
54 lines
1.0 KiB
Rust
use crate::model::{Bank, Pattern};
|
|
|
|
const MAX_UNDO: usize = 100;
|
|
|
|
pub enum UndoScope {
|
|
Pattern {
|
|
bank: usize,
|
|
pattern: usize,
|
|
data: Pattern,
|
|
},
|
|
Bank {
|
|
bank: usize,
|
|
data: Bank,
|
|
},
|
|
}
|
|
|
|
pub struct UndoEntry {
|
|
pub scope: UndoScope,
|
|
pub cursor: (usize, usize, usize),
|
|
}
|
|
|
|
#[derive(Default)]
|
|
pub struct UndoHistory {
|
|
pub(crate) undo_stack: Vec<UndoEntry>,
|
|
redo_stack: Vec<UndoEntry>,
|
|
}
|
|
|
|
impl UndoHistory {
|
|
pub fn push(&mut self, entry: UndoEntry) {
|
|
self.redo_stack.clear();
|
|
if self.undo_stack.len() >= MAX_UNDO {
|
|
self.undo_stack.remove(0);
|
|
}
|
|
self.undo_stack.push(entry);
|
|
}
|
|
|
|
pub fn pop_undo(&mut self) -> Option<UndoEntry> {
|
|
self.undo_stack.pop()
|
|
}
|
|
|
|
pub fn push_redo(&mut self, entry: UndoEntry) {
|
|
self.redo_stack.push(entry);
|
|
}
|
|
|
|
pub fn pop_redo(&mut self) -> Option<UndoEntry> {
|
|
self.redo_stack.pop()
|
|
}
|
|
|
|
pub fn clear(&mut self) {
|
|
self.undo_stack.clear();
|
|
self.redo_stack.clear();
|
|
}
|
|
}
|