Merge CV, ver=5.1; ops/methods from HV, and interface from CV where possible

[goodguy/history.git] / cinelerra-5.1 / cinelerra / undostackitem.h

diff --git a/cinelerra-5.1/cinelerra/undostackitem.h b/cinelerra-5.1/cinelerra/undostackitem.h
new file mode 100644 (file)
index 0000000..90a77d7
--- /dev/null
+++ b/cinelerra-5.1/cinelerra/undostackitem.h
@@ -0,0 +1,59 @@
+
+/*
+ * CINELERRA
+ * Copyright (C) 2008 Adam Williams <broadcast at earthling dot net>
+ * 
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ * 
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ * 
+ */
+
+#ifndef UNDOSTACKITEM_H
+#define UNDOSTACKITEM_H
+
+#include "linklist.h"
+
+
+class UndoStackItem : public ListItem<UndoStackItem>
+{
+public:
+       UndoStackItem();
+       virtual ~UndoStackItem();
+
+       void set_description(const char *description);
+       void set_creator(void *creator);
+
+// This function must be overridden in derived objects.
+// It is called both to undo and to redo an operation.
+// The override must do the following:
+// - change the EDL to undo an operation;
+// - change the internal information of the item so that the next invocation
+//   of undo() does a redo (i.e. undoes the undone operation).
+       virtual void undo();
+
+// Return the amount of memory used for the data associated with this
+// object in order to enable limiting the amount of memory used by the
+// undo stack.
+// Ignore overhead and just report the specific data values that the
+// derived object adds.
+       virtual int get_size();
+       
+       
+// command description for the menu item
+       char *description;
+// who created this item
+       void* creator;
+};
+
+#endif