Changes in src/Actions/Action.hpp [bfce50:f9352d]

File:

• src/Actions/Action.hpp (modified) (2 diffs)

src/Actions/Action.hpp

@@ -10 +10 @@
 
 #include <string>
+#include <boost/shared_ptr.hpp>
+
+// forward declaration
+
+class ActionState;
+class ActionSequence;
 
 /**
@@ -21 +27 @@
 class Action
 {
-protected:
+friend class ActionSequence;
 public:
+
+  typedef boost::shared_ptr<ActionState> state_ptr;
+
   Action(std::string _name,bool _doRegister=true);
   virtual ~Action();
 
-  virtual void call()=0;
-  virtual void undo()=0;
+  // this method only handles the infrastructure
+  // actuall action is passed on to a private virtual
+  void call();
+  state_ptr undo(state_ptr);
+  state_ptr redo(state_ptr);
+
   virtual bool canUndo()=0;
-  //virtual bool shouldUndo()=0;
+  virtual bool shouldUndo()=0;
+
+  virtual bool isActive();
 
   virtual const std::string getName();
 
+protected:
+  static state_ptr success;
+  static state_ptr failure;
+
 private:
+  virtual state_ptr performCall()=0;
+  virtual state_ptr performUndo(state_ptr)=0;
+  virtual state_ptr performRedo(state_ptr)=0;
+
   std::string name;
 };
 
+/**
+ * This class can be used by actions to save the state.
+ *
+ * It is implementing a memento pattern. The base class is completely empty,
+ * since no general state internals can be given. The Action performing
+ * the Undo should downcast to the apropriate type.
+ */
+class ActionState{
+public:
+  ActionState(){}
+  virtual ~ActionState(){}
+};
+
 #endif /* ACTION_H_ */