context menus, document refactoring, fixes

src/snapshots.cpp

@@ -0,0 +1,68 @@
+#include "snapshots.h"
+
+namespace anm2ed::snapshots
+{
+  bool SnapshotStack::is_empty()
+  {
+    return top == 0;
+  }
+
+  void SnapshotStack::push(Snapshot& snapshot)
+  {
+    if (top >= MAX)
+    {
+      for (int i = 0; i < MAX - 1; i++)
+        snapshots[i] = snapshots[i + 1];
+      top = MAX - 1;
+    }
+    snapshots[top++] = snapshot;
+  }
+
+  Snapshot* SnapshotStack::pop()
+  {
+    if (is_empty()) return nullptr;
+    return &snapshots[--top];
+  }
+
+  void SnapshotStack::clear()
+  {
+    top = 0;
+  }
+
+  void Snapshots::push(const anm2::Anm2& anm2, anm2::Reference reference, const std::string& message)
+  {
+    Snapshot snapshot = {anm2, reference, message};
+    undoStack.push(snapshot);
+    redoStack.clear();
+  }
+
+  void Snapshots::undo(anm2::Anm2& anm2, anm2::Reference& reference, std::string& message)
+  {
+    if (auto current = undoStack.pop())
+    {
+      Snapshot snapshot = {anm2, reference, message};
+      redoStack.push(snapshot);
+      anm2 = current->anm2;
+      reference = current->reference;
+      message = current->message;
+    }
+  }
+
+  void Snapshots::redo(anm2::Anm2& anm2, anm2::Reference& reference, std::string& message)
+  {
+    if (auto current = redoStack.pop())
+    {
+      Snapshot snapshot = {anm2, reference, message};
+      undoStack.push(snapshot);
+      anm2 = current->anm2;
+      reference = current->reference;
+      message = current->message;
+    }
+  }
+
+  void Snapshots::reset()
+  {
+    undoStack.clear();
+    redoStack.clear();
+  }
+};