Fix undo-redo

c12i · Nov 28, 2023 · 43f19d3 · 43f19d3
1 parent c8be2d3
commit 43f19d3
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Showing 2 changed files with 3 additions and 1 deletion.
diff --git a/src/components/undo-button.js b/src/components/undo-button.js
@@ -6,7 +6,7 @@ export class UndoButton {
       'button',
       {
         onclick: () => dispatch({ undo: true }),
-        disabled: state.done.length < 1,
+        disabled: state.done.length <= 1,
       },
       '⤴ Undo'
     )

diff --git a/src/index.js b/src/index.js
@@ -43,6 +43,7 @@ const baseControls = [
 // quasi - reducer function
 function historyUpdateState(state, action) {
   if (action.undo) {
+    if (state.done.length <= 1) return state
     let redone = state.done.pop()
     return cached({
       ...state,
@@ -54,6 +55,7 @@ function historyUpdateState(state, action) {
   }
 
   if (action.redo) {
+    if (state.redone.length < 1) return state
     let picture = state.redone.pop()
     return cached({
       ...state,