From 73b73540218ed67974014ad7449fbc911c5f3893 Mon Sep 17 00:00:00 2001
From: Wang Zhi <yfwz100@yeah.net>
Date: Wed, 6 Mar 2024 17:09:08 +0800
Subject: [PATCH] feat: add `canUndo()` and `canRedo()`. (#155)

---
 packages/history/index.ts | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/packages/history/index.ts b/packages/history/index.ts
index ea5b992..1311993 100644
--- a/packages/history/index.ts
+++ b/packages/history/index.ts
@@ -143,6 +143,10 @@ class History {
     }
   }
 
+  canRedo() {
+    return this.stack.redo.length > 0;
+  }
+
   redo() {
     this.change('redo', 'undo');
   }
@@ -152,6 +156,10 @@ class History {
     transformStack(this.stack.redo, op);
   }
 
+  canUndo() {
+    return this.stack.undo.length > 0;
+  }
+
   undo() {
     this.change('undo', 'redo');
   }