cytoscape-addon - Vaadin Add-on Directory
Cytoscape for Vaadin Flow / Graph / Network
# Cytoscape Addon for Vaadin 14+ (based on npm)
This Vaadin addon wrappes [https://js.cytoscape.org/](https://js.cytoscape.org/) in a java component. It does not cover all features, but most of them an
showcases how you can extent it on your own.
This addon uses currently to cytoscape extensions:
* EdgeHandling: [https://github.com/cytoscape/cytoscape.js-edgehandles](https://github.com/cytoscape/cytoscape.js-edgehandles)
* ContextMenu: [https://github.com/cytoscape/cytoscape.js-cxtmenu](https://github.com/cytoscape/cytoscape.js-cxtmenu)
## Links
* Source code: [https://github.com/martinprause/cytoscape-addon](https://github.com/martinprause/cytoscape-addon)
* Vaadin directory: [https://vaadin.com/directory/component/cytoscape-addon](https://vaadin.com/directory/component/cytoscape-addon)
* Demo: [https://ctyoscapedemo.herokuapp.com/](https://ctyoscapedemo.herokuapp.com/)
## Running the demo application
Using `jetty:run` or by running the `de.xinblue.cytoscape.View` class (in src/text/java) directly from your IDE.
# Examples
```
public class View extends Div {
private VerticalLayout dashboard=new VerticalLayout();
private HorizontalLayout hl1=new HorizontalLayout();
private Label output=new Label();
private Label rawOutput=new Label();
private VerticalLayout buttonLayout=new VerticalLayout();
private VerticalLayout nodeList=new VerticalLayout();
private void createDashboard() {
H1 headline=new H1("Cytoscape Vaadin Addon");
dashboard.add(headline);
Label headlineLabel=new Label("Use the mousewheel to zoom. Drag icons on the canvas to add nodes. Tap (left mosue down) on a node/edge to access the context menu. Click on the edge handle (blue dot on mouse over) to draw edges between nodes.");
dashboard.add(headlineLabel);
hl1.setWidth("100%");
dashboard.add(hl1);
dashboard.add(output);
dashboard.add(rawOutput);
add(dashboard);
}
private void setOutput(String s) {
output.setText(s);
}
private void setRawOutput(String s) {
rawOutput.setText(s);
}
private void processContextMenu(Cytoscape cy,String s) {
ObjectMapper mapper = new ObjectMapper();
JsonNode actualObj;
try {
actualObj = mapper.readTree(s);
if (actualObj.get("action").asText().equalsIgnoreCase("editnode") ) {
setOutput("Contextmenu Edit Node");
} else if (actualObj.get("action").asText().equalsIgnoreCase("deletenode") ) {
setOutput("Contextmenu Delete Node");
cy.deleteNode(actualObj.get("id").asText());
} else if (actualObj.get("action").asText().equalsIgnoreCase("showedge") ) {
setOutput("Contextmenu Edit Edge");
}
} catch (Exception e1) {
e1.printStackTrace();
}
}
private void createButtonLayout(Cytoscape cy) {
Button b1=new Button("Load graph");
b1.addClickListener( e -> {cy.loadGraph(cy.getDemoGraph2());});
buttonLayout.add(b1);
Button b2=new Button("Export graph");
b2.addClickListener( e -> {cy.exportGraph().then(e2 -> {setOutput("Export Graph");setRawOutput(e2.toJson());});});
buttonLayout.add(b2);
Button b3=new Button("Center graph");
b3.addClickListener( e -> {cy.centerGraph();});
buttonLayout.add(b3);
Button b4=new Button("Get selected elements");
b4.addClickListener( e -> {cy.getSelectedElements().then(e2 -> {setOutput("Export Graph");setRawOutput(e2.toJson());});});
buttonLayout.add(b4);
Button b5=new Button("Add predefined nodes and edges dynamically");
b5.addClickListener( e -> {
Node node1=new Node();
node1.getPosition().put("x", 100);
node1.getPosition().put("y", 100);
node1.getData().put("id", "x1");
node1.getData().put("myname", "martin");
Node node2=new Node();
node2.getPosition().put("x", 200);
node2.getPosition().put("y", 200);
node2.getData().put("id", "x2");
Edge edge1=new Edge();
edge1.getData().put("id", "x1-x2");
edge1.getData().put("source", "x1");
edge1.getData().put("target", "x2");
cy.addNode(node1).then(e1 -> cy.addNode(node2).then(e3 -> cy.addEdge(edge1)));
});
buttonLayout.add(b5);
Button b6=new Button("Clear all");
b6.addClickListener( e -> {cy.deleteAll();});
buttonLayout.add(b6);
Button b7=new Button("Delete selected nodes");
b7.addClickListener( e -> {
cy.getSelectedElements().then(e2 -> {
setOutput("Delete selected");setRawOutput(e2.toJson());
String s=e2.toJson();
try {
JsonNode selectedObject = new ObjectMapper().readTree(s);
Iterator iterator = selectedObject.iterator();
System.out.println("delete selected");
while (iterator.hasNext()) {
JsonNode js=iterator.next().at("/data/id");
String id=js.asText();
cy.deleteNode(id);
}
} catch (Exception e1) {
e1.printStackTrace();
}
});
});
buttonLayout.add(b7);
Button b8=new Button("Set element data");
b8.addClickListener( e -> {cy.getSelectedElements().then(e2 -> {
String s=e2.toJson();
try {
JsonNode selectedObject = new ObjectMapper().readTree(s);
Iterator iterator = selectedObject.iterator();
while (iterator.hasNext()) {
JsonNode js=iterator.next().at("/data/id");
String id=js.asText();
setOutput("Set data of element with id:");setRawOutput(id);
cy.setElementData(id,"{\"myname\":\"martin\"}");
}
} catch (Exception e1) {
e1.printStackTrace();
}
});
});
buttonLayout.add(b8);
}
private void createNodeList(Cytoscape cy) {
nodeList.setWidth("200px");
Icon logo1 = new Icon(VaadinIcon.CIRCLE);
logo1.setSize("100px");
logo1.setColor("orange");
Icon logo2 = new Icon(VaadinIcon.ELASTIC);
logo2.setSize("100px");
logo2.setColor("orange");
nodeList.add(logo1);
nodeList.add(logo2);
//Make icons draggable
DragSource box1DragSource = DragSource.create(logo1);
box1DragSource.setDragData("MyNode1");
DragSource box2DragSource = DragSource.create(logo2);
box2DragSource.setDragData("MyNode2");
box1DragSource.addDragStartListener( e -> cy.setDragObject("Node1"));
box2DragSource.addDragStartListener( e -> cy.setDragObject("Node2"));
}
private void createDashBoardContent() {
//Create Cytoscape Canvas
Cytoscape cy=new Cytoscape();
cy.setWidth("100%");
cy.setHeight("600px");
cy.addClassName("cy");
//Add edge handling
cy.registerStandardEdgeHandling();
//Create context menu for nodes and edges. Tap on an edge or node (left mouse down for 1 second)
cy.createContextMenu("node",new String[]{"DeleteNode","EditNode"});
cy.createContextMenu("edge",new String[]{"ShowEdge"});
cy.addActionListener(e -> {
setRawOutput("ActionEvent: "+e.getMessage());
processContextMenu(cy,e.getMessage());
});
cy.registerEvent("mouseover", "node");
cy.addCustomEventListener(e -> {
try {
JsonNode event = new ObjectMapper().readTree(e.getMessage());
setOutput("CustomEvent:");
setRawOutput(e.getMessage());
JsonNode ja=event.get("data");
Iterator iterator = ja.iterator();
while (iterator.hasNext()) {
JsonNode js=iterator.next().at("/data/id");
String id=js.asText();
}
} catch (Exception ex) {
ex.printStackTrace();
}
});
cy.addNodeHasBeenAddedEventListener(e -> {
setOutput("NodeHasBeenAdded Event");
setRawOutput(e.getMessage());
});
cy.addEdgeHasBeenAddedEventListener(e -> {
setOutput("EdgeHasBeenAdded Event");
setRawOutput(e.getMessage());
});
cy.addEdgeAddedEventListener(e -> {
setOutput("EdgeAdded Event");
setRawOutput(e.getMessage());
});
cy.addDragListener(e -> {
try {
JsonNode dragObject = new ObjectMapper().readTree(e.getMessage());
Node node=new Node();
node.getPosition().put("x", dragObject.get("dragXCoordinate").asInt());
node.getPosition().put("y", dragObject.get("dragYCoordinate").asInt());
node.getData().put("type", dragObject.get("dragObject").asText());
cy.addNode(node);
setOutput("Drag Event");
setRawOutput(e.getMessage());
} catch (Exception ex) {
ex.printStackTrace();
}
});
DropTarget
dropTarget = DropTarget.create(cy);
dropTarget.addDropListener(event -> {
event.getDragData().ifPresent(data -> {
setOutput("Drag target");
});
});
//Define an array of styles for different selectors
GraphStyles gs=new GraphStyles();
//Define the style for nodes
GeneralGraphStyles node=new GeneralGraphStyles.Builder().background_color("#c00").label("data(id)").build();
gs.addStyle("node", node);
//Define the style for edges
GeneralGraphStyles edge=new GeneralGraphStyles.Builder().width("2").line_color("#00c").line_style("dotted").build();
gs.addStyle("edge", edge);
//Define the style for selected nodes
GeneralGraphStyles node_selected=new GeneralGraphStyles.Builder().background_color("#0c0").build();
gs.addStyle("node:selected", node_selected);
//Define the style for edgeHandling
GeneralGraphStyles eh_handle=new GeneralGraphStyles.Builder().background_color("#00C").width("8").height("8").text_opacity("0").build();
gs.addStyle(".eh-handle", eh_handle);
//Set the styles
cy.loadStyle(gs.getJson(true));
//Load demo graph
cy.loadGraph(cy.getDemoGraph2());
createButtonLayout(cy);
createNodeList(cy);
hl1.add(buttonLayout,nodeList,cy);
}
public View() {
createDashboard();
createDashBoardContent();
}
}
```