Provide status messages on splash screen when loading (#1696)

include/Engine.h

@@ -27,6 +27,9 @@
 #define ENGINE_H
 
 #include <QtCore/QMap>
+#include <QtCore/QString>
+#include <QtCore/QObject>
+
 
 #include "export.h"
 
@@ -39,8 +42,9 @@ class Song;
 class Ladspa2LMMS;
 
 
-class EXPORT Engine
+class EXPORT Engine : public QObject
 {
+	Q_OBJECT
 public:
 	static void init();
 	static void destroy();
@@ -94,6 +98,18 @@ public:
 		return s_pluginFileHandling;
 	}
 
+	static inline Engine * inst()
+	{
+		if( s_instanceOfMe == NULL )
+		{
+			s_instanceOfMe = new Engine();
+		}
+		return s_instanceOfMe;
+	}
+
+signals:
+	void initProgress(const QString &msg);
+
 
 private:
 	// small helper function which sets the pointer to NULL before actually deleting
@@ -120,6 +136,9 @@ private:
 
 	static QMap<QString, QString> s_pluginFileHandling;
 
+	// even though most methods are static, an instance is needed for Qt slots/signals
+	static Engine * s_instanceOfMe;
+
 	static void initPluginFileHandling();
 
 	friend class GuiApplication;

include/GuiApplication.h

@@ -25,8 +25,12 @@
 #ifndef GUIAPPLICATION_H
 #define GUIAPPLICATION_H
 
+#include <QtCore/QObject>
+
 #include "export.h"
 
+class QLabel;
+
 class AutomationEditorWindow;
 class BBEditor;
 class ControllerRackView;
@@ -36,8 +40,9 @@ class PianoRollWindow;
 class ProjectNotes;
 class SongEditorWindow;
 
-class EXPORT GuiApplication
+class EXPORT GuiApplication : public QObject
 {
+	Q_OBJECT;
 public:
 	explicit GuiApplication();
 	~GuiApplication();
@@ -53,6 +58,9 @@ public:
 	AutomationEditorWindow* automationEditor() { return m_automationEditor; }
 	ControllerRackView* getControllerRackView() { return m_controllerRackView; }
 
+public slots:
+	void displayInitProgress(const QString &msg);
+
 private:
 	static GuiApplication* s_instance;
 
@@ -64,6 +72,7 @@ private:
 	PianoRollWindow* m_pianoRoll;
 	ProjectNotes* m_projectNotes;
 	ControllerRackView* m_controllerRackView;
+	QLabel* m_loadingProgressLabel;
 };
 
 #define gui GuiApplication::instance()

include/MainWindow.h

@@ -190,6 +190,7 @@ private slots:
 
 signals:
 	void periodicUpdate();
+	void initProgress(const QString &msg);
 
 } ;