--- /dev/null
+/*******************************************************************************
+ * Copyright (c) 2020 Association for Decentralized Information Management in
+ * Industry THTH ry.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ * Semantum Oy - initial API and implementation
+ *******************************************************************************/
+package org.simantics.diagram.participant;
+
+import org.simantics.Simantics;
+import org.simantics.db.ReadGraph;
+import org.simantics.db.Resource;
+import org.simantics.db.common.request.UnaryRead;
+import org.simantics.db.exception.DatabaseException;
+import org.simantics.db.procedure.Listener;
+import org.simantics.diagram.connection.rendering.ConnectionCrossings;
+import org.simantics.diagram.stubs.DiagramResource;
+import org.simantics.g2d.canvas.ICanvasContext;
+import org.simantics.g2d.canvas.SGDesignation;
+import org.simantics.g2d.canvas.impl.SGNodeReflection.SGCleanup;
+import org.simantics.g2d.canvas.impl.SGNodeReflection.SGInit;
+import org.simantics.g2d.diagram.participant.AbstractDiagramParticipant;
+import org.simantics.scenegraph.g2d.G2DParentNode;
+import org.simantics.scenegraph.g2d.nodes.ConnectionCrossingsNode;
+import org.simantics.utils.datastructures.Pair;
+import org.simantics.utils.ui.ErrorLogger;
+
+public class ConnectionCrossingsParticipant extends AbstractDiagramParticipant {
+ private static final String CONNECTION_CROSSINGS_NODE_KEY = "connection-crossings";
+
+ private ConnectionCrossingsNode ccNode;
+ private final ConnectionCrossings crossings = new ConnectionCrossings();
+ private ConnectionCrossingStyleListener listener;
+ private Resource diagram;
+
+ public ConnectionCrossingsParticipant(Resource diagram) {
+ this.diagram = diagram;
+ }
+ public ConnectionCrossingsParticipant(double width, ConnectionCrossings.Type type) {
+ crossings.setWidth(width);
+ crossings.setType(type);
+ }
+
+ @SGInit(designation = SGDesignation.CONTROL)
+ public void initSG(G2DParentNode parent) {
+ ccNode = parent.addNode(CONNECTION_CROSSINGS_NODE_KEY, ConnectionCrossingsNode.class);
+ ccNode.setCrossings(crossings);
+ ccNode.setZIndex(Integer.MIN_VALUE / 4);
+ }
+
+ @SGCleanup
+ public void cleanupSG() {
+ if (ccNode != null) {
+ ccNode.remove();
+ ccNode = null;
+ }
+ }
+
+ @Override
+ public void addedToContext(ICanvasContext ctx) {
+ super.addedToContext(ctx);
+
+ if (diagram != null) {
+ listener = new ConnectionCrossingStyleListener(ctx);
+ Simantics.getSession().async(new UnaryRead<Resource, Pair<Double, ConnectionCrossings.Type>>(diagram){
+
+ @Override
+ public Pair<Double, ConnectionCrossings.Type> perform(ReadGraph graph) throws DatabaseException {
+ DiagramResource DIA = DiagramResource.getInstance(graph);
+ Double gap = graph.getPossibleRelatedValue(diagram, DIA.ConnectionCrossingStyle_Width);
+ Resource typeRes = graph.getPossibleObject(diagram, DIA.ConnectionCrossingStyle_HasType);
+ ConnectionCrossings.Type type;
+ if (DIA.ConnectionCrossingStyle_Type_Gap.equals(typeRes)) {
+ type = ConnectionCrossings.Type.GAP;
+ } else if (DIA.ConnectionCrossingStyle_Type_Arc.equals(typeRes)) {
+ type = ConnectionCrossings.Type.ARC;
+ } else if (DIA.ConnectionCrossingStyle_Type_Square.equals(typeRes)) {
+ type = ConnectionCrossings.Type.SQUARE;
+ } else {
+ type = ConnectionCrossings.Type.NONE;
+ }
+ return new Pair<>(gap, type);
+ }
+
+ }, listener);
+ }
+ }
+
+ @Override
+ public void removedFromContext(ICanvasContext ctx) {
+ if (listener != null) {
+ listener.dispose();
+ listener = null;
+ }
+ super.removedFromContext(ctx);
+ }
+
+ class ConnectionCrossingStyleListener implements Listener<Pair<Double, ConnectionCrossings.Type>> {
+ ICanvasContext context;
+ public ConnectionCrossingStyleListener(ICanvasContext context) {
+ this.context = context;
+ }
+ @Override
+ public void execute(final Pair<Double, ConnectionCrossings.Type> result) {
+ context.getThreadAccess().asyncExec(new Runnable() {
+ @Override
+ public void run() {
+ ICanvasContext ctx = context;
+ if (ctx == null)
+ return;
+ if (ctx.isDisposed())
+ return;
+ crossings.setWidth(result.first != null ? result.first : 0.0);
+ crossings.setType(result.second);
+ ccNode.repaint();
+ }
+ });
+ }
+ public void dispose() {
+ context = null;
+ }
+ @Override
+ public boolean isDisposed() {
+ return context == null || context.isDisposed();
+ }
+ @Override
+ public void exception(Throwable t) {
+ ErrorLogger.defaultLogError(t);
+ }
+ }
+
+}