blob: d996a30ed58e2ad1cbb05f106a1dee955dae2ab2 (
plain) (
blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
|
import type { Command } from "@/lib/commands";
export class CommandManager {
private history: Command[] = [];
private redoStack: Command[] = [];
execute({ command }: { command: Command }): Command {
command.execute();
this.history.push(command);
this.redoStack = [];
return command;
}
undo(): void {
if (this.history.length === 0) return;
const command = this.history.pop();
command?.undo();
if (command) {
this.redoStack.push(command);
}
}
redo(): void {
if (this.redoStack.length === 0) return;
const command = this.redoStack.pop();
command?.redo();
if (command) {
this.history.push(command);
}
}
canUndo(): boolean {
return this.history.length > 0;
}
canRedo(): boolean {
return this.redoStack.length > 0;
}
clear(): void {
this.history = [];
this.redoStack = [];
}
}
|
