Let class SelectDiagramWidget use ComboBoxWidgetBase as base class

Fixup of commit f0b38d10.

umbrello/dialogs/widgets/selectdiagramwidget.cpp

@@ -27,18 +27,8 @@
  * @param parent parent widget
  */
 SelectDiagramWidget::SelectDiagramWidget(const QString &title, QWidget *parent)
-  : QWidget(parent)
+  : ComboBoxWidgetBase(title, QString(), parent)
 {
-    QHBoxLayout *layout = new QHBoxLayout;
-    layout->setContentsMargins(0,0,0,0);
-
-    m_label = new QLabel(title, this);
-    layout->addWidget(m_label);
-
-    m_editField = new KComboBox(this);
-    m_editField->setEditable(true);
-    layout->addWidget(m_editField, 2);
-    setLayout(layout);
 }
 
 /**
@@ -71,17 +61,6 @@ void SelectDiagramWidget::setupWidget(Uml::DiagramType::Enum type, const QString
         m_editField->setCurrentIndex(currentIndex);
     }
 }
-/**
- * Add this widget to a given grid layout. Umbrello dialogs places labels in column 0
- * and the editable field in column 1.
- * @param layout The layout to which the widget should be added
- * @param row The row in the grid layout where the widget should be placed
- */
-void SelectDiagramWidget::addToLayout(QGridLayout *layout, int row)
-{
-    layout->addWidget(m_label, row, 0);
-    layout->addWidget(m_editField, row, 1);
-}
 
 /**
  * Return current text

umbrello/dialogs/widgets/selectdiagramwidget.h

@@ -13,31 +13,21 @@
 
 #include "basictypes.h"
 
-#include <QWidget>
-
-class KComboBox;
-
-class QGridLayout;
-class QLabel;
+#include "comboboxwidgetbase.h"
 
 /**
  * This widget provides selecting a diagram from the list of currently available diagrams
  * @author Ralf Habacker
  */
-class SelectDiagramWidget : public QWidget
+class SelectDiagramWidget : public ComboBoxWidgetBase
 {
     Q_OBJECT
 public:
     explicit SelectDiagramWidget(const QString &title, QWidget *parent = nullptr);
 
     void setupWidget(Uml::DiagramType::Enum type, const QString &currentName, const QString &excludeName, bool withNewEntry = true);
-    void addToLayout(QGridLayout *layout, int row);
     QString currentText();
     Uml::ID::Type currentID();
-
-protected:
-    QLabel *m_label;
-    KComboBox *m_editField;
 };
 
 #endif // SELECTDIAGRAMWIDGET_H