[Tools] add PrefQuantitySpinBox to designer plugins/widget/FreeCAD_widgets.vcxproj

as discussed here: https://forum.freecadweb.org/viewtopic.php?f=10&t=49315&p=422648#p422648

src/Tools/plugins/widget/customwidgets.cpp

@@ -658,6 +658,37 @@ void PrefUnitSpinBox::setParamGrpPath ( const QByteArray& name )
 
 // --------------------------------------------------------------------
 
+PrefQuantitySpinBox::PrefQuantitySpinBox(QWidget* parent)
+    : QuantitySpinBox(parent)
+{
+}
+
+PrefQuantitySpinBox::~PrefQuantitySpinBox()
+{
+}
+
+QByteArray PrefQuantitySpinBox::entryName() const
+{
+    return m_sPrefName;
+}
+
+QByteArray PrefQuantitySpinBox::paramGrpPath() const
+{
+    return m_sPrefGrp;
+}
+
+void PrefQuantitySpinBox::setEntryName(const QByteArray& name)
+{
+    m_sPrefName = name;
+}
+
+void PrefQuantitySpinBox::setParamGrpPath(const QByteArray& name)
+{
+    m_sPrefGrp = name;
+}
+
+// --------------------------------------------------------------------
+
 CommandIconView::CommandIconView ( QWidget * parent )
   : QListWidget(parent)
 {

src/Tools/plugins/widget/customwidgets.h

@@ -25,20 +25,20 @@
 #define GUI_CUSTOMWIDGETS_H
 
 #include <QButtonGroup>
-#include <QWidget>
+#include <QCheckBox>
+#include <QComboBox>
+#include <QDoubleSpinBox>
+#include <QFontComboBox>
+#include <QGridLayout>
+#include <QGroupBox>
+#include <QLabel>
 #include <QLineEdit>
 #include <QListWidget>
 #include <QPushButton>
 #include <QRadioButton>
 #include <QSpinBox>
-#include <QDoubleSpinBox>
-#include <QComboBox>
-#include <QCheckBox>
-#include <QLabel>
-#include <QGroupBox>
-#include <QGridLayout>
 #include <QTreeWidget>
-#include <QFontComboBox>
+#include <QWidget>
 
 namespace Base {
     class Quantity{};
@@ -325,6 +325,29 @@ private:
 
 // ------------------------------------------------------------------------------
 
+class PrefQuantitySpinBox : public QuantitySpinBox
+{
+    Q_OBJECT
+
+        Q_PROPERTY(QByteArray prefEntry READ entryName     WRITE setEntryName)
+        Q_PROPERTY(QByteArray prefPath  READ paramGrpPath  WRITE setParamGrpPath)
+
+public:
+    PrefQuantitySpinBox(QWidget* parent = 0);
+    virtual ~PrefQuantitySpinBox();
+
+    QByteArray entryName() const;
+    QByteArray paramGrpPath() const;
+    void  setEntryName(const QByteArray& name);
+    void  setParamGrpPath(const QByteArray& name);
+
+private:
+    QByteArray m_sPrefName;
+    QByteArray m_sPrefGrp;
+};
+
+// ------------------------------------------------------------------------------
+
 class CommandIconView : public QListWidget
 {
     Q_OBJECT

src/Tools/plugins/widget/plugin.cpp

@@ -667,6 +667,54 @@ public:
     }
 };
 
+class PrefQuantitySpinBoxPlugin : public QDesignerCustomWidgetInterface
+{
+    Q_INTERFACES(QDesignerCustomWidgetInterface)
+public:
+    PrefQuantitySpinBoxPlugin()
+    {
+    }
+    QWidget* createWidget(QWidget* parent)
+    {
+        return new Gui::PrefQuantitySpinBox(parent);
+    }
+    QString group() const
+    {
+        return QLatin1String("Preference Widgets");
+    }
+    QIcon icon() const
+    {
+        return QIcon(QPixmap(quantityspinbox_pixmap));
+    }
+    QString includeFile() const
+    {
+        return QLatin1String("Gui/PrefWidgets.h");
+    }
+    QString toolTip() const
+    {
+        return QLatin1String("Preference Quantity Spin Box");
+    }
+    QString whatsThis() const
+    {
+        return QLatin1String("Preference Quantity Spin Box Widget.");
+    }
+    bool isContainer() const
+    {
+        return false;
+    }
+    QString domXml() const
+    {
+        return "<ui language=\"c++\">\n"
+            " <widget class=\"Gui::PrefQuantitySpinBox\" name=\"unitSpinBox\">\n"
+            " </widget>\n"
+            "</ui>";
+    }
+    QString name() const
+    {
+        return QLatin1String("Gui::PrefQuantitySpinBox");
+    }
+};
+
 /* XPM */
 static const char *iconview_pixmap[]={
 "22 22 10 1",
@@ -1565,6 +1613,7 @@ QList<QDesignerCustomWidgetInterface *> CustomWidgetPlugin::customWidgets () con
     cw.append(new PrefDoubleSpinBoxPlugin);
     cw.append(new PrefFontBoxPlugin);
     cw.append(new PrefUnitSpinBoxPlugin);
+    cw.append(new PrefQuantitySpinBoxPlugin);
     return cw;
 }