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/MetaEditWidget.cpp

@@ -0,0 +1,67 @@
+#include "MetaEditWidget.h"
+#include "MetaEditModel.h"
+
+#include <QTableView>
+#include <QGridLayout>
+#include <QKeyEvent>
+#include <QPushButton>
+
+MetaEditWidget::MetaEditWidget(Floorplan::Meta* meta) : QWidget(nullptr), metaOrig(meta) {
+
+	// local copy. for the abort button [orig is unchanged]
+	metaCopy.params = metaOrig->params;
+
+	QGridLayout* lay = new QGridLayout(this);
+
+	tbl = new QTableView();
+	lay->addWidget(tbl, 0, 0, 1, 3);
+
+	model = new MetaEditModel();
+	model->setSource(&metaCopy);	// we edit the copy
+
+	tbl->setModel(model);
+	tbl->setSelectionBehavior(QAbstractItemView::SelectRows);
+	tbl->setSelectionMode(QAbstractItemView::SingleSelection);
+
+
+	// events
+	QPushButton* btnAdd = new QPushButton("add entry");
+	lay->addWidget(btnAdd, 1, 0);
+	btnAdd->connect(btnAdd, &QPushButton::clicked, [this] (const bool) {
+		model->addEntry();
+	});
+	btnAdd->setToolTip("add a new, empty entry. delete an entry using the keyboard");
+
+	QPushButton* btnCancel = new QPushButton("abort");
+	lay->addWidget(btnCancel, 1, 1);
+	btnCancel->connect(btnCancel, &QPushButton::clicked, [this] (const bool) {
+		// do not apply changes. juts close
+		close();
+	});
+	btnCancel->setToolTip("close the dialog without committing the changes");
+
+	QPushButton* btnOK = new QPushButton("OK");
+	lay->addWidget(btnOK, 1, 2);
+	btnOK->connect(btnOK, &QPushButton::clicked, [this] (const bool) {
+		metaOrig->params = metaCopy.params;	// apply changed
+		close();
+	});
+	btnOK->setToolTip("commit the changes and close the dialog");
+
+
+	// sizing
+	resize(500,400);
+
+}
+
+void MetaEditWidget::keyPressEvent(QKeyEvent* e) {
+
+	if (e->key() == Qt::Key_Delete) {
+		QModelIndexList indices = tbl->selectionModel()->selectedIndexes();
+		for (const QModelIndex& idx : indices) {
+			model->deleteEntry(idx.row());
+			break;	// the list contains one entry per column!
+		}
+	}
+
+}