Added initial code for a GUI<->engine message system.

3 files changed, 87 insertions, 0 deletions

diff --git a/src/drumgizmo.cc b/src/drumgizmo.cc
index ec03d76..93426de 100644
--- a/src/drumgizmo.cc
+++ b/src/drumgizmo.cc
@@ -56,6 +56,31 @@ DrumGizmo::~DrumGizmo()
   */
 }
 
+/*
+ * Send a message to the engine. The engine takes over the memory.
+ */
+void DrumGizmo::sendMessage(Message *msg)
+{
+  message_mutex.lock();
+  message_queue.push_back(msg);
+  message_mutex.unlock();
+}
+
+/*
+ * Receive message from the engine. The caller takes over the memory.
+ */
+Message *DrumGizmo::receiveMessage()
+{
+  Message *msg = NULL;
+  message_mutex.lock();
+  if(message_queue.size()) {
+    msg = message_queue.front();
+    message_queue.pop_front();
+  }
+  message_mutex.unlock();
+  return msg;
+}
+
 std::string DrumGizmo::drumkitfile()
 {
   return kitfile;
diff --git a/src/drumgizmo.h b/src/drumgizmo.h
index e79dad0..92faa3c 100644
--- a/src/drumgizmo.h
+++ b/src/drumgizmo.h
@@ -41,6 +41,8 @@
 
 #include "mutex.h"
 
+#include "message.h"
+
 #define MAX_NUM_CHANNELS 512
 
 class DrumGizmo {
@@ -68,7 +70,20 @@ public:
   std::string midimapfile;
   std::string kitfile;
 
+  /*
+   * Send a message to the engine. The engine takes over the memory.
+   */
+  void sendMessage(Message *msg);
+
+  /*
+   * Receive message from the engine. The caller takes over the memory.
+   */
+  Message *receiveMessage();
+
 private:
+  Mutex message_mutex;
+  std::list<Message *> message_queue;
+
   DrumKitLoader loader;
 
   Mutex mutex;
diff --git a/src/message.h b/src/message.h
new file mode 100644
index 0000000..c9e630d
--- /dev/null
+++ b/src/message.h
@@ -0,0 +1,47 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/***************************************************************************
+ *            message.h
+ *
+ *  Wed Mar 20 15:50:57 CET 2013
+ *  Copyright 2013 Bent Bisballe Nyeng
+ *  deva@aasimon.org
+ ****************************************************************************/
+
+/*
+ *  This file is part of DrumGizmo.
+ *
+ *  DrumGizmo 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.
+ *
+ *  DrumGizmo 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 DrumGizmo; if not, write to the Free Software
+ *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA.
+ */
+#ifndef __DRUMGIZMO_MESSAGE_H__
+#define __DRUMGIZMO_MESSAGE_H__
+
+class Message {
+public:
+  typedef enum {
+    LoadStatus,
+  } type_t;
+
+  virtual type_t type() = 0;
+};
+
+class LoadStatus : public Message {
+public:
+  type_t type() { return Message::LoadStatus; }
+  unsigned int number_of_files;
+  unsigned int numer_of_files_loaded;
+  std::string current_file;
+};
+
+#endif/*__DRUMGIZMO_MESSAGE_H__*/