Events.md

Events

Each model (DiagramModel, NodeModel etc..) are all built ontop of an event system. You can listen for most of these events by registering an event on the model itself.

All models

All models will fire these events:

lockChanged?(entity: BaseEntity,locked: boolean)

Fires when the lock state of the entity changes. If an element is locked, it cannot be moved or deletes.

All Base models excluding DiagramModel

selectionChanged?(item: BaseModel, isSelected:boolean)

When the selected property of a model changes

entityRemoved?(item:any)

When the entity is going to be deleted. The DiagramModel listeners for this event to when to remove the model from itself.

DiagramModel

nodesUpdated(node: any, isCreated:boolean)

When nodes are added or removed

linksUpdated(link: any, isCreated:boolean)

when links are added or removed

controlsUpdated() [DEPRECIATED]

depreciated, use offsetUpdated and zoomUpdated instead

offsetUpdated(model: DiagramModel,offsetX: number, offsetY: number)

to know when the canvas was translated in any direction

zoomUpdated(model: DiagramModel,zoom: number)

to know when the zoom level of the canvas was updated

DiagramEngine

The diagram engine

nodeFactoriesUpdated

When node factories have been added or removed from the engine

linkFactoriesUpdated

When link factories have been added or removed from the engine

LinkModel

sourcePortChanged?(item:LinkModel,target: null|PortModel)

targetPortChanged?(item:LinkModel,target: null|PortModel)

Example of usage

let model = new SRD.DiagramModel();
let node1 = new SRD.DefaultNodeModel("default","rgb(0,192,255)");
node1.addListener({
      entityRemoved: (node) => {
        console.log('Removed', node.id)
      },
      selectionChanged: (node, isSelected) => {
        console.log(isSelected?'Selected':'Unselected', node)
      }
    });
model.addListener({
      linksUpdated:(entity, isAdded) => {
        console.log(isAdded?'added':'removed', entity)
      },
      nodesUpdated: (entity, isAdded) => {
        console.log(isAdded?'added':'removed', entity)
      }
    });