feat: add comprehensive Ctrl-Z/Ctrl-Y undo/redo engine for MAIN SESSION and SECTION-TAB

2026-07-29 16:05:43 +07:00
parent f721b8242f
commit d4ad3bc1f7
3 changed files with 556 additions and 145 deletions
@@ -0,0 +1,74 @@
+// SonicForge Studio - Unified Undo/Redo Engine
+// Handles all undoable actions across MAIN SESSION and SECTION-TAB
+
+const UndoRedoEngine = (function() {
+  const MAX_HISTORY = 50;
+  const history = [];
+  let historyIndex = -1;
+
+  function push(entry) {
+    history.push(entry);
+    if (history.length > MAX_HISTORY) {
+      history.shift();
+    }
+    historyIndex = history.length - 1;
+  }
+
+  function undo() {
+    if (historyIndex < 0) return null;
+    const entry = history[historyIndex];
+    historyIndex--;
+    return entry;
+  }
+
+  function redo() {
+    if (historyIndex >= history.length - 1) return null;
+    historyIndex++;
+    const entry = history[historyIndex];
+    return entry;
+  }
+
+  function canUndo() { return historyIndex >= 0; }
+  function canRedo() { return historyIndex < history.length - 1; }
+
+  function clear() {
+    history.length = 0;
+    historyIndex = -1;
+  }
+
+  function execute(entry) {
+    // entry: { type, scope, label, before, after, undo, redo }
+    // Trim future history if we're not at the end
+    if (historyIndex < history.length - 1) {
+      history.splice(historyIndex + 1);
+    }
+    push(entry);
+    return entry;
+  }
+
+  function getStatus() {
+    return {
+      canUndo: canUndo(),
+      canRedo: canRedo(),
+      undoCount: historyIndex + 1,
+      redoCount: history.length - historyIndex - 1,
+      lastAction: history[historyIndex]?.type || null,
+      lastLabel: history[historyIndex]?.label || null
+    };
+  }
+
+  return {
+    push,
+    undo,
+    redo,
+    canUndo,
+    canRedo,
+    clear,
+    execute,
+    getStatus,
+    history,
+    historyIndex
+  };
+})();
+
+window.UndoRedoEngine = UndoRedoEngine;