add option for max backups

closes #2264

git-svn-id: http://www.openflipper.org/svnrepo/OpenFlipper/branches/Free@20242 383ad7c9-94d9-4d36-a494-682f7c89f535

common/BackupData.cc

 #include "BackupData.hh"
 
-#define MAX_BACKUPS 20
-
 //-----------------------------------------------------------------------------
 
-BackupData::BackupData(BaseObjectData* _object) : currentState_(0), object_(_object)
+BackupData::BackupData(BaseObjectData* _object) : currentState_(0), object_(_object), maxBackups_(20)
 {
 }
 
@@ -16,6 +14,20 @@ BackupData::~BackupData(){
 
 //-----------------------------------------------------------------------------
 
+size_t BackupData::maxBackups()
+{
+  return maxBackups_;
+}
+
+//-----------------------------------------------------------------------------
+
+void BackupData::setMaxBackups(size_t _max)
+{
+  maxBackups_ = _max;
+}
+
+//-----------------------------------------------------------------------------
+
 void BackupData::storeBackup(BaseBackup* _backup){
 
   //store state
@@ -31,7 +43,7 @@ void BackupData::storeBackup(BaseBackup* _backup){
   }
 
   //delete undo backups if there are too many
-  while( undoStates_.size() > MAX_BACKUPS ){
+  while( undoStates_.size() > maxBackups_ ){
     delete undoStates_.front();
     undoStates_.erase( undoStates_.begin() );
   }

common/BackupData.hh

@@ -106,12 +106,20 @@ class DLLEXPORT BackupData : public PerObjectData
     /// return the current state
     BaseBackup* currentState();
 
+    /// return the maximum of backups which are saved
+    size_t maxBackups();
+
+    /// set the maximum of saved backups
+    void setMaxBackups(size_t _max);
+
   protected:
     std::vector< BaseBackup* > undoStates_;
     std::vector< BaseBackup* > redoStates_;
     BaseBackup* currentState_;
 
     BaseObjectData* object_;
+
+    size_t maxBackups_;
 };
 
 #endif //BACKUPDATA_HH