add OuputDevice as singleton to manage output to statusbar,

QtMeshViewer/Header/FileInterface.h

@@ -1,5 +1,4 @@
 #pragma once
-#include <QObject>
 #include <QOpenGlTexture>
 #include <fstream>
 #include <QVector>
@@ -7,7 +6,6 @@
 #include <QMatrix4x4>
 #include <QQuaternion>
 #include <QRegExp>
-#include "MainWindow.h"
 
 struct BoundingBox {
 	QQuaternion rotation;
@@ -54,14 +52,12 @@ struct Material {
 	std::uint8_t dataValues[2] = { 0 };
 };
 
-class FileInterface : public QObject
+class FileInterface
 {
-	Q_OBJECT
 
 public:
-	explicit FileInterface(QString path, QObject *parent)
-		: QObject(parent)
-		, m_models(new QVector<Model*>)
+	explicit FileInterface(QString path)
+		: m_models(new QVector<Model*>)
 		, m_materials(new QVector<Material>)
 	{
 		//open file
@@ -70,10 +66,6 @@ public:
 		if (!m_file.is_open())
 			throw std::invalid_argument(std::string("ERROR: file not found: ") += path.toStdString());
 
-		MainWindow* tmp = dynamic_cast<MainWindow*>(parent->parent()->parent());
-		if(tmp != NULL)
-			connect(this, SIGNAL(sendMessage(QString, int)), tmp, SLOT(printMessage(QString, int)));
-
 		m_filepath = path.left(path.lastIndexOf(QRegExp("/|\\\\")));
 
 	};
@@ -138,6 +130,4 @@ public:
 		return defMaterial;
 	};
 
-signals:
-	void sendMessage(QString msg, int severity);
 };

QtMeshViewer/Header/GeometryEngine.h

@@ -46,7 +46,6 @@ public slots:
 // signals
 signals:
 	void requestResetView();
-	void sendMessage(QString message, int severity);
 	void requestUpdate();
 	void sendFileInfo(QString name, QVector<Material>* materials, int vertices, int triangle);
 };

QtMeshViewer/Header/MshFile.h

@@ -20,7 +20,7 @@ enum ModelTyp {
 class MshFile : public FileInterface
 {
 public:
-	explicit MshFile(QString path, QObject *parent = Q_NULLPTR);
+	explicit MshFile(QString path);
 	virtual ~MshFile();
 
 private:

QtMeshViewer/Header/OglViewerWidget.h

@@ -91,7 +91,6 @@ public slots:
 
 // signals
 signals:
-	void sendMessage(QString message, int severity);
 	void loadFile(QString);
 };
 

QtMeshViewer/Header/OutputDevice.h

@@ -0,0 +1,27 @@
+#pragma once
+#include <QObject>
+
+class OutputDevice : public QObject
+{
+	Q_OBJECT
+
+private:
+	OutputDevice(QObject *parent = Q_NULLPTR) : QObject(parent) {};
+
+public:
+	OutputDevice(OutputDevice const&) = delete;
+	void operator=(OutputDevice const&) = delete;
+
+	~OutputDevice() {};
+
+	static OutputDevice* getInstance(QObject *parent = Q_NULLPTR) {
+		static OutputDevice* instance = new OutputDevice(parent);
+		return instance;
+	};
+
+	void print(QString message, int severity) { emit sendMessage(message, severity); };
+
+signals:
+	void sendMessage(QString message, int severity);
+
+};