vis.js is a dynamic, browser-based visualization library
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let Node = require("./components/Node");
let util = require('../../util');
class SelectionHandler {
constructor(body, canvas) {
this.body = body;
this.canvas = canvas;
this.selectionObj = {nodes: [], edges: []};
this.options = {};
this.defaultOptions = {
select: true,
selectConnectedEdges: true
};
util.extend(this.options, this.defaultOptions);
this.body.emitter.on("_dataChanged", () => {
this.updateSelection()
});
}
setOptions(options) {
if (options !== undefined) {
util.deepExtend(this.options, options);
}
}
/**
* handles the selection part of the tap;
*
* @param {Object} pointer
* @private
*/
selectOnPoint(pointer) {
let selected = false;
if (this.options.select === true) {
this.unselectAll();
let obj = this.getNodeAt(pointer) || this.getEdgeAt(pointer);;
if (obj !== undefined) {
selected = this.selectObject(obj);
}
this.body.emitter.emit("_requestRedraw");
}
return selected;
}
selectAdditionalOnPoint(pointer) {
let selectionChanged = false;
if (this.options.select === true) {
let obj = this.getNodeAt(pointer) || this.getEdgeAt(pointer);;
if (obj !== undefined) {
selectionChanged = true;
if (obj.isSelected() === true) {
this.deselectObject(obj);
}
else {
this.selectObject(obj);
}
this.body.emitter.emit("_requestRedraw");
}
}
return selectionChanged;
}
_generateClickEvent(eventType, pointer, oldSelection) {
let properties = this.getSelection();
properties['pointer'] = {
DOM: {x: pointer.x, y: pointer.y},
canvas: this.canvas.DOMtoCanvas(pointer)
}
if (oldSelection !== undefined) {
properties['previousSelection'] = oldSelection;
}
this.body.emitter.emit(eventType, properties);
}
selectObject(obj, highlightEdges = this.options.selectConnectedEdges) {
if (obj !== undefined) {
if (obj instanceof Node) {
if (highlightEdges === true) {
this._selectConnectedEdges(obj);
}
}
obj.select();
this._addToSelection(obj);
return true;
}
return false;
}
deselectObject(obj) {
if (obj.isSelected() === true) {
obj.selected = false;
this._removeFromSelection(obj);
}
}
/**
* retrieve all nodes overlapping with given object
* @param {Object} object An object with parameters left, top, right, bottom
* @return {Number[]} An array with id's of the overlapping nodes
* @private
*/
_getAllNodesOverlappingWith(object) {
let overlappingNodes = [];
let nodes = this.body.nodes;
for (let i = 0; i < this.body.nodeIndices.length; i++) {
let nodeId = this.body.nodeIndices[i];
if (nodes[nodeId].isOverlappingWith(object)) {
overlappingNodes.push(nodeId);
}
}
return overlappingNodes;
}
/**
* Return a position object in canvasspace from a single point in screenspace
*
* @param pointer
* @returns {{left: number, top: number, right: number, bottom: number}}
* @private
*/
_pointerToPositionObject(pointer) {
let canvasPos = this.canvas.DOMtoCanvas(pointer);
return {
left: canvasPos.x - 1,
top: canvasPos.y + 1,
right: canvasPos.x + 1,
bottom: canvasPos.y - 1
};
}
/**
* Get the top node at the a specific point (like a click)
*
* @param {{x: Number, y: Number}} pointer
* @return {Node | undefined} node
* @private
*/
getNodeAt(pointer) {
// we first check if this is an navigation controls element
let positionObject = this._pointerToPositionObject(pointer);
let overlappingNodes = this._getAllNodesOverlappingWith(positionObject);
// if there are overlapping nodes, select the last one, this is the
// one which is drawn on top of the others
if (overlappingNodes.length > 0) {
return this.body.nodes[overlappingNodes[overlappingNodes.length - 1]];
}
else {
return undefined;
}
}
/**
* retrieve all edges overlapping with given object, selector is around center
* @param {Object} object An object with parameters left, top, right, bottom
* @return {Number[]} An array with id's of the overlapping nodes
* @private
*/
_getEdgesOverlappingWith(object, overlappingEdges) {
let edges = this.body.edges;
for (let i = 0; i < this.body.edgeIndices.length; i++) {
let edgeId = this.body.edgeIndices[i];
if (edges[edgeId].isOverlappingWith(object)) {
overlappingEdges.push(edgeId);
}
}
}
/**
* retrieve all nodes overlapping with given object
* @param {Object} object An object with parameters left, top, right, bottom
* @return {Number[]} An array with id's of the overlapping nodes
* @private
*/
_getAllEdgesOverlappingWith(object) {
let overlappingEdges = [];
this._getEdgesOverlappingWith(object,overlappingEdges);
return overlappingEdges;
}
/**
* Place holder. To implement change the getNodeAt to a _getObjectAt. Have the _getObjectAt call
* getNodeAt and _getEdgesAt, then priortize the selection to user preferences.
*
* @param pointer
* @returns {undefined}
* @private
*/
getEdgeAt(pointer) {
let positionObject = this._pointerToPositionObject(pointer);
let overlappingEdges = this._getAllEdgesOverlappingWith(positionObject);
if (overlappingEdges.length > 0) {
return this.body.edges[overlappingEdges[overlappingEdges.length - 1]];
}
else {
return undefined;
}
}
/**
* Add object to the selection array.
*
* @param obj
* @private
*/
_addToSelection(obj) {
if (obj instanceof Node) {
this.selectionObj.nodes[obj.id] = obj;
}
else {
this.selectionObj.edges[obj.id] = obj;
}
}
/**
* Add object to the selection array.
*
* @param obj
* @private
*/
_addToHover(obj) {
if (obj instanceof Node) {
this.hoverObj.nodes[obj.id] = obj;
}
else {
this.hoverObj.edges[obj.id] = obj;
}
}
/**
* Remove a single option from selection.
*
* @param {Object} obj
* @private
*/
_removeFromSelection(obj) {
if (obj instanceof Node) {
delete this.selectionObj.nodes[obj.id];
}
else {
delete this.selectionObj.edges[obj.id];
}
}
/**
* Unselect all. The selectionObj is useful for this.
*
* @private
*/
unselectAll() {
for(let nodeId in this.selectionObj.nodes) {
if(this.selectionObj.nodes.hasOwnProperty(nodeId)) {
this.selectionObj.nodes[nodeId].unselect();
}
}
for(let edgeId in this.selectionObj.edges) {
if(this.selectionObj.edges.hasOwnProperty(edgeId)) {
this.selectionObj.edges[edgeId].unselect();
}
}
this.selectionObj = {nodes:{},edges:{}};
}
/**
* return the number of selected nodes
*
* @returns {number}
* @private
*/
_getSelectedNodeCount() {
let count = 0;
for (let nodeId in this.selectionObj.nodes) {
if (this.selectionObj.nodes.hasOwnProperty(nodeId)) {
count += 1;
}
}
return count;
}
/**
* return the selected node
*
* @returns {number}
* @private
*/
_getSelectedNode() {
for (let nodeId in this.selectionObj.nodes) {
if (this.selectionObj.nodes.hasOwnProperty(nodeId)) {
return this.selectionObj.nodes[nodeId];
}
}
return undefined;
}
/**
* return the selected edge
*
* @returns {number}
* @private
*/
_getSelectedEdge() {
for (let edgeId in this.selectionObj.edges) {
if (this.selectionObj.edges.hasOwnProperty(edgeId)) {
return this.selectionObj.edges[edgeId];
}
}
return undefined;
}
/**
* return the number of selected edges
*
* @returns {number}
* @private
*/
_getSelectedEdgeCount() {
let count = 0;
for (let edgeId in this.selectionObj.edges) {
if (this.selectionObj.edges.hasOwnProperty(edgeId)) {
count += 1;
}
}
return count;
}
/**
* return the number of selected objects.
*
* @returns {number}
* @private
*/
_getSelectedObjectCount() {
let count = 0;
for(let nodeId in this.selectionObj.nodes) {
if(this.selectionObj.nodes.hasOwnProperty(nodeId)) {
count += 1;
}
}
for(let edgeId in this.selectionObj.edges) {
if(this.selectionObj.edges.hasOwnProperty(edgeId)) {
count += 1;
}
}
return count;
}
/**
* Check if anything is selected
*
* @returns {boolean}
* @private
*/
_selectionIsEmpty() {
for(let nodeId in this.selectionObj.nodes) {
if(this.selectionObj.nodes.hasOwnProperty(nodeId)) {
return false;
}
}
for(let edgeId in this.selectionObj.edges) {
if(this.selectionObj.edges.hasOwnProperty(edgeId)) {
return false;
}
}
return true;
}
/**
* check if one of the selected nodes is a cluster.
*
* @returns {boolean}
* @private
*/
_clusterInSelection() {
for(let nodeId in this.selectionObj.nodes) {
if(this.selectionObj.nodes.hasOwnProperty(nodeId)) {
if (this.selectionObj.nodes[nodeId].clusterSize > 1) {
return true;
}
}
}
return false;
}
/**
* select the edges connected to the node that is being selected
*
* @param {Node} node
* @private
*/
_selectConnectedEdges(node) {
for (let i = 0; i < node.edges.length; i++) {
let edge = node.edges[i];
edge.select();
this._addToSelection(edge);
}
}
/**
* select the edges connected to the node that is being selected
*
* @param {Node} node
* @private
*/
_hoverConnectedEdges(node) {
for (let i = 0; i < node.edges.length; i++) {
let edge = node.edges[i];
edge.hover = true;
this._addToHover(edge);
}
}
/**
* unselect the edges connected to the node that is being selected
*
* @param {Node} node
* @private
*/
_unselectConnectedEdges(node) {
for (let i = 0; i < node.edges.length; i++) {
let edge = node.edges[i];
edge.unselect();
this._removeFromSelection(edge);
}
}
/**
* This is called when someone clicks on a node. either select or deselect it.
* If there is an existing selection and we don't want to append to it, clear the existing selection
*
* @param {Node || Edge} object
* @private
*/
blurObject(object) {
if (object.hover === true) {
object.hover = false;
this.body.emitter.emit("blurNode",{node:object.id});
}
}
/**
* This is called when someone clicks on a node. either select or deselect it.
* If there is an existing selection and we don't want to append to it, clear the existing selection
*
* @param {Node || Edge} object
* @private
*/
hoverObject(object) {
if (object.hover === false) {
object.hover = true;
this._addToHover(object);
if (object instanceof Node) {
this.body.emitter.emit("hoverNode",{node:object.id});
}
}
if (object instanceof Node) {
this._hoverConnectedEdges(object);
}
}
/**
*
* retrieve the currently selected objects
* @return {{nodes: Array.<String>, edges: Array.<String>}} selection
*/
getSelection() {
let nodeIds = this.getSelectedNodes();
let edgeIds = this.getSelectedEdges();
return {nodes:nodeIds, edges:edgeIds};
}
/**
*
* retrieve the currently selected nodes
* @return {String[]} selection An array with the ids of the
* selected nodes.
*/
getSelectedNodes() {
let idArray = [];
if (this.options.select === true) {
for (let nodeId in this.selectionObj.nodes) {
if (this.selectionObj.nodes.hasOwnProperty(nodeId)) {
idArray.push(nodeId);
}
}
}
return idArray;
}
/**
*
* retrieve the currently selected edges
* @return {Array} selection An array with the ids of the
* selected nodes.
*/
getSelectedEdges() {
let idArray = [];
if (this.options.select === true) {
for (let edgeId in this.selectionObj.edges) {
if (this.selectionObj.edges.hasOwnProperty(edgeId)) {
idArray.push(edgeId);
}
}
}
return idArray;
}
/**
* select zero or more nodes with the option to highlight edges
* @param {Number[] | String[]} selection An array with the ids of the
* selected nodes.
* @param {boolean} [highlightEdges]
*/
selectNodes(selection, highlightEdges = true) {
let i, id;
if (!selection || (selection.length === undefined))
throw 'Selection must be an array with ids';
// first unselect any selected node
this.unselectAll();
for (i = 0; i < selection.length; i++) {
id = selection[i];
let node = this.body.nodes[id];
if (!node) {
throw new RangeError('Node with id "' + id + '" not found');
}
this.selectObject(node,highlightEdges);
}
this.body.emitter.emit('_requestRedraw');
}
/**
* select zero or more edges
* @param {Number[] | String[]} selection An array with the ids of the
* selected nodes.
*/
selectEdges(selection) {
let i, id;
if (!selection || (selection.length === undefined))
throw 'Selection must be an array with ids';
// first unselect any selected objects
this.unselectAll();
for (i = 0; i < selection.length; i++) {
id = selection[i];
let edge = this.body.edges[id];
if (!edge) {
throw new RangeError('Edge with id "' + id + '" not found');
}
this.selectObject(edge);
}
this.body.emitter.emit('_requestRedraw');
}
/**
* Validate the selection: remove ids of nodes which no longer exist
* @private
*/
updateSelection() {
for (let nodeId in this.selectionObj.nodes) {
if (this.selectionObj.nodes.hasOwnProperty(nodeId)) {
if (!this.body.nodes.hasOwnProperty(nodeId)) {
delete this.selectionObj.nodes[nodeId];
}
}
}
for (let edgeId in this.selectionObj.edges) {
if (this.selectionObj.edges.hasOwnProperty(edgeId)) {
if (!this.body.edges.hasOwnProperty(edgeId)) {
delete this.selectionObj.edges[edgeId];
}
}
}
}
}
export default SelectionHandler;