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| 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 | 1x 1x 6x 4x 4x 2x 2x 1x 1x 2x 2x 1x 1x 1x | import { Command, CommandResultInterface } from "./command";
export class CommandManager {
protected commands: Command[] = [];
public constructor() {
// nothing to do
}
public execute(command: Command): CommandResultInterface {
this.commands.push(command);
return command.execute();
}
public redo(): CommandResultInterface | null {
const command = this.commands.slice(-1)[0];
if (null != command) {
return this.execute(command);
}
return null;
}
public undo(): CommandResultInterface | null {
const command = this.commands.pop();
if (null != command) {
return command.undo();
}
return null;
}
}
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