refactoring qad widgets part 2

c++ cast, nullptr, forward declaration, agregate ui, connect to member functions, order and clear includes

libs/widgets/matrixedit.h

@@ -20,8 +20,8 @@
 #ifndef MATRIXEDIT_H
 #define MATRIXEDIT_H
 
-#include <QWidget>
 #include "qad_widgets_export.h"
+#include <QWidget>
 
 
 namespace Ui {
@@ -32,8 +32,8 @@ namespace Ui {
 class QAD_WIDGETS_EXPORT MatrixEdit: public QWidget {
 	Q_OBJECT
 public:
-	explicit MatrixEdit(QWidget * parent = 0);
-	~MatrixEdit();
+	explicit MatrixEdit(QWidget * parent = nullptr);
+	~MatrixEdit() override;
 
 	bool isReadOnly() const;
 	void setReadOnly(bool yes);
@@ -43,14 +43,6 @@ public:
 	void setVector(const QVector<double> & v);
 	void setMatrix(const QVector<QVector<double> > & v);
 
-private:
-	void setVectorMode(bool yes);
-	void clear(bool ident = false);
-	void changeEvent(QEvent * e);
-
-	Ui::MatrixEdit * ui;
-	bool ro;
-
 private slots:
 	void on_spinRows_valueChanged(int cnt);
 	void on_spinCols_valueChanged(int cnt);
@@ -59,7 +51,14 @@ private slots:
 
 signals:
 	void changed();
-	
+
+private:
+	void setVectorMode(bool yes);
+	void clear(bool ident = false);
+	void changeEvent(QEvent * e) override;
+
+	Ui::MatrixEdit * ui;
+	bool ro;
 };