added "new map" button

fixed minor model/logic issues

MainController.cpp

@@ -81,7 +81,8 @@ MainController::MainController() {
 	connect(mapModel, SIGNAL(reset()), this, SLOT(onMapModelReset()));
 	mapModel->addListener(this);
 
-	// load/save
+	// new/load/save
+	connect(mw->getActionWidget(), SIGNAL(onNew()), this, SLOT(onNew()));
 	connect(mw->getActionWidget(), SIGNAL(onLoad()), this, SLOT(onLoad()));
 	connect(mw->getActionWidget(), SIGNAL(onSave()), this, SLOT(onSave()));
 
@@ -96,6 +97,8 @@ MainController::MainController() {
 
 
 	mapModel->load("../IndoorMap/maps/SHL38_no_elev.xml");
+	//mapModel->load("/apps/android/workspace/testmap.xml");
+
 	//mapModel->resize(0.983, 0.983, 1,   -0.2, -0.3, 0);
 
 
@@ -168,6 +171,8 @@ void MainController::onMapModelAboutToReset() {
     mw->getLayerParamWidget()->setElement(nullptr);
     mw->getToolBoxWidget()->setSelectedLayer(nullptr);
     mw->getMapView2D()->update();
+	mw->getMapView3D()->update();
+	//mw->getToolBoxWidget()->
 }
 
 void MainController::onMapModelNeedsRepaint() {
@@ -180,6 +185,14 @@ void MainController::onMapModelReset() {
 	mw->getLINT()->update(mapModel->getMap());
 }
 
+
+void MainController::onNew() {
+	const int res = QMessageBox::question(nullptr, "New Map", "really start a new map?", QMessageBox::Yes, QMessageBox::No);
+	if (res == QMessageBox::Yes) {
+		mapModel->startEmpty();
+	}
+}
+
 void MainController::onLoad() {
     QString file = QFileDialog::getOpenFileName(mw, "open a map");
     if (file != "") {

MainController.h

@@ -55,9 +55,8 @@ public slots:
 	/** the currently selected MapElement has changed */
 	void curMapElementChanged();
 
-
+	void onNew();
 	void onLoad();
-
 	void onSave();
 
 	void onMapModelAboutToReset();

mapview/2D/tools/ToolSelector.h

@@ -181,8 +181,10 @@ private:
 			// set the currently focused object (if any)
 			focused = el;
 
-			// focus the new one (if any)
+			// focus the new one (if any, and focus supported)
-			if (focused) {focused->getMV2D()->focus();}
+			if (focused && focused->getMV2D()) {
+				focused->getMV2D()->focus();
+			}
 
 			// update the help-text
 			showHelp();

mapview/3D/MapView3D.cpp

@@ -185,12 +185,21 @@ void MapView3D::showFloorplan() {
 }
 
 void MapView3D::showGrid() {
+
+	// delete the previous grid (if any)
 	if (gridModel) {delete gridModel; gridModel = nullptr;}
+
+	// build a new model
 	GridModel* gm = new GridModel();
 	Floorplan::IndoorMap* im = getModel()->getMap();
 	gm->rebuild(im);
+
+	// remember
 	this->gridModel = gm;
+
+	// update UI
 	update();
+
 }
 
 void MapView3D::draw() {

mapview/3DGrid/GridModel.h

@@ -21,7 +21,8 @@ class GridModel {
 
 private:
 
-	int gridSize_cm = 20;
+	int gridSize_cm = 30;	// TODO
+
 	Grid<MyNode> grid;
 	Floorplan::IndoorMap* im;
 

mapview/model/MapModel.h

@@ -53,10 +53,17 @@ public:
 
 	/** create a new, empty root node */
 	void startEmpty() {
+
+		emit aboutToReset();
+		cleanup();
+
 		im = new Floorplan::IndoorMap();
 		root = new MMRoot(nullptr, im);
 		root->addListener(this);
 		//root->addSublayer(new MMFloors(root, im));
+
+		emit reset();
+
 	}
 
 	void cleanup() {

params/ActionWidget.cpp

@@ -7,15 +7,21 @@ ActionWidget::ActionWidget(QWidget *parent) : QWidget(parent) {
 
 	QHBoxLayout* lay = new QHBoxLayout(this);
 
+
+	QPushButton* btnNew = new QPushButton("new");
+	lay->addWidget(btnNew);
+
 	QPushButton* btnLoad = new QPushButton("load");
 	lay->addWidget(btnLoad);
 
 	QPushButton* btnSave = new QPushButton("save");
 	lay->addWidget(btnSave);
 
+	// events
+	connect(btnNew, SIGNAL(clicked(bool)), this, SIGNAL(onNew()));
+
 	connect(btnLoad, SIGNAL(clicked(bool)), this, SIGNAL(onLoad()));
 
 	connect(btnSave, SIGNAL(clicked(bool)), this, SIGNAL(onSave()));
 
-
 }

params/ActionWidget.h

@@ -13,10 +13,15 @@ public:
 
 signals:
 
+	/** request: load a map */
 	void onLoad();
 
+	/** request: save a map */
 	void onSave();
 
+	/** request: new map */
+	void onNew();
+
 public slots:
 
 };