added a ruler for measuring

added support for meta-data editing
improved element selection
changed zooming
fixed some issues with layer events
fixed issue with 3D outline
fixed loading issue for old maps
some interface changes

params/MetaEditModel.h

@@ -0,0 +1,41 @@
+#ifndef METAEDITMODEL_H
+#define METAEDITMODEL_H
+
+#include <Indoor/floorplan/v2/Floorplan.h>
+#include <QAbstractTableModel>
+
+class MetaEditModel : public QAbstractTableModel {
+
+	Q_OBJECT
+
+private:
+
+	Floorplan::Meta* meta = nullptr;
+
+public:
+
+	MetaEditModel(QObject* parent = nullptr);
+
+	/** delete the idx-th entry */
+	void deleteEntry(const int idx);
+
+	/** add a new entry at the end */
+	void addEntry();
+
+	void setSource(Floorplan::Meta* meta);
+
+	int rowCount(const QModelIndex& parent) const override;
+
+	int columnCount(const QModelIndex& parent) const override;
+
+	Qt::ItemFlags flags(const QModelIndex &index) const override;
+
+	QVariant data(const QModelIndex& index, int role = Qt::DisplayRole) const override;
+
+	QVariant headerData(int section, Qt::Orientation orientation, int role) const override;
+
+	bool setData(const QModelIndex & index, const QVariant &value, int role = Qt::EditRole) override;
+
+};
+
+#endif // METAEDITMODEL_H