refactoring qad widgets part 1

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

libs/widgets/ecombobox.h

@@ -20,39 +20,40 @@
 #ifndef ECOMBOBOX_H
 #define ECOMBOBOX_H
 
-#include <QComboBox>
-#include <QBoxLayout>
-#include <QTreeView>
-#include <QLabel>
-#include "clineedit.h"
 #include "qad_widgets_export.h"
+#include <QComboBox>
+
+
+class CLineEdit;
+class QLabel;
+class QTreeView;
 
 
 class QAD_WIDGETS_EXPORT EComboBox: public QComboBox
 {
 	Q_OBJECT
 public:
-	explicit EComboBox(QWidget * parent = 0);
+	explicit EComboBox(QWidget * parent = nullptr);
 	
-	QSize sizeHint() const;
+	QSize sizeHint() const override;
 
 public slots:
-	virtual void showPopup();
-	
-private:
-	void changeEvent(QEvent *e);
+	void showPopup() override;
 
-	QTreeView iv;
-	QWidget header;
-	QLabel icon;
-	CLineEdit filter;
-	QFont nfont, ifont;
-	
 private slots:
-	void filterChanged(const QString & text, bool first = false);
-	
+	void filterChanged(const QString & text, bool first);
+
 signals:
 	void rowsChanged();
+
+private:
+	void changeEvent(QEvent *e) override;
+
+	QTreeView * iv;
+	QWidget * header;
+	QLabel * icon;
+	CLineEdit * filter;
+	QFont nfont, ifont;
 };
 
 #endif // ECOMBOBOX_H