ILLUSIONS: Add UpdateFunctions class

1 files changed, 72 insertions, 0 deletions

diff --git a/engines/illusions/updatefunctions.h b/engines/illusions/updatefunctions.h
new file mode 100644
index 0000000000..bd8aef3548
--- /dev/null
+++ b/engines/illusions/updatefunctions.h
@@ -0,0 +1,72 @@
+/* ScummVM - Graphic Adventure Engine
+ *
+ * ScummVM is the legal property of its developers, whose names
+ * are too numerous to list here. Please refer to the COPYRIGHT
+ * file distributed with this source distribution.
+ *
+ * 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ */
+
+#ifndef ILLUSIONS_UPDATEFUNCTIONS_H
+#define ILLUSIONS_UPDATEFUNCTIONS_H
+
+#include "common/func.h"
+#include "common/list.h"
+
+namespace Illusions {
+
+enum {
+	kUFNext         = 1,  // Run next update funtion
+	kUFTerminate    = 2   // Terminate update function
+};
+
+typedef Common::Functor0<int> UpdateFunctionCallback;
+
+class UpdateFunction {
+public:
+	int _priority;
+	uint32 _tag;
+	UpdateFunctionCallback *_callback;
+	UpdateFunction() : _priority(0), _tag(0), _callback(0) {}
+	~UpdateFunction() { delete _callback; }
+	int run() { return (*_callback)(); }
+};
+
+class UpdateFunctions {
+public:
+	UpdateFunctions();
+	~UpdateFunctions();
+	void add(int priority, uint32 tag, UpdateFunctionCallback *callback);
+	void update();
+protected:
+	typedef Common::List<UpdateFunction*> UpdateFunctionList;
+	typedef UpdateFunctionList::iterator UpdateFunctionListIterator;
+
+	struct FindInsertionPosition : public Common::UnaryFunction<const UpdateFunction*, bool> {
+		int _priority;
+		FindInsertionPosition(int priority) : _priority(priority) {}
+		bool operator()(const UpdateFunction *updateFunction) const {
+			return updateFunction->_priority > _priority;
+		}
+	};
+
+	Common::List<UpdateFunction*> _updateFunctions;
+	uint32 _lastTimerUpdateTime;
+};
+
+} // End of namespace Illusions
+
+#endif // ILLUSIONS_UPDATEFUNCTIONS_H