SpinSlider and ScrollSpinBox read-only support

PIVariantEdit - support for read-only for all types
PIValueTreeEdit - drop Parent grouping, default now Groups, full grouping control, global read-only support, fix new label error

libs/piqt_utils/pivaluetree_edit.h

@@ -49,8 +49,7 @@ public:
 	enum Grouping {
 		Indent,
 		Groups,
-		Tabs,
-		Parent = 0xFF
+		Tabs
 	};
 
 	void setValue(const PIValueTree & v);
@@ -60,6 +59,8 @@ public:
 	void setGrouping(Grouping g);
 	bool isFullEditMode() const { return is_full_edit; }
 	void setFullEditMode(bool yes);
+	bool isReadOnly() const { return m_read_only; }
+	void setReadOnly(bool yes);
 
 	void setAllowedNamesFunction(std::function<PIStringList()> f) { allowed_names = f; }
 	void setValueForNameFunction(std::function<PIVariant(PIString)> f) { value_by_name = f; }
@@ -97,6 +98,7 @@ private:
 	void applyVariantEdit(PIVariantEdit * ve, const PIValueTree & vt);
 	void createTabWidget();
 	void resizeArray();
+	PIVariantMap attributesWithRO(const PIVariantMap & attr);
 
 	class GridWidgets: public QWidget {
 	public:
@@ -146,9 +148,9 @@ private:
 	QTabWidget * tab_widget = nullptr;
 	Ui::PIValueTreeEditArray * ui_array;
 	GridWidgets * grid    = nullptr;
-	Grouping cur_grouping = Parent, real_grouping = Indent;
+	Grouping cur_grouping = Groups;
 	mutable PIValueTree source, current;
-	bool is_full_edit = false;
+	bool is_full_edit = false, m_read_only = false;
 	std::function<PIStringList()> allowed_names;
 	std::function<PIVariant(PIString)> value_by_name;
 };