Press n or j to go to the next uncovered block, b, p or k for the previous block.
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* 通用撤销/重做栈
* 存储状态快照（headers + rows），限制最大栈深度避免内存溢出
*/
export interface Snapshot {
headers: string[];
rows: string[][];
}
const MAX_HISTORY = 100;
export class UndoRedoStack {
private undoStack: Snapshot[] = [];
private redoStack: Snapshot[] = [];
push(snapshot: Snapshot) {
this.undoStack.push(snapshot);
if (this.undoStack.length > MAX_HISTORY) {
this.undoStack.shift();
}
this.redoStack = [];
}
undo(current: Snapshot): Snapshot | null {
if (this.undoStack.length === 0) return null;
const prev = this.undoStack.pop()!;
this.redoStack.push(current);
return prev;
}
redo(current: Snapshot): Snapshot | null {
if (this.redoStack.length === 0) return null;
const next = this.redoStack.pop()!;
this.undoStack.push(current);
return next;
}
canUndo(): boolean {
return this.undoStack.length > 0;
}
canRedo(): boolean {
return this.redoStack.length > 0;
}
clear() {
this.undoStack = [];
this.redoStack = [];
}
}
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