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774 lines
20 KiB
774 lines
20 KiB
var Node = require('./components/Node').default;
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var Edge = require('./components/Edge').default;
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let util = require('../../util');
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class SelectionHandler {
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constructor(body, canvas) {
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this.body = body;
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this.canvas = canvas;
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this.selectionObj = {nodes: [], edges: []};
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this.hoverObj = {nodes:{},edges:{}};
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this.options = {};
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this.defaultOptions = {
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multiselect: false,
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selectable: true,
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selectConnectedEdges: true,
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hoverConnectedEdges: true
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};
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util.extend(this.options, this.defaultOptions);
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this.body.emitter.on("_dataChanged", () => {
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this.updateSelection()
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});
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}
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setOptions(options) {
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if (options !== undefined) {
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let fields = ['multiselect','hoverConnectedEdges','selectable','selectConnectedEdges'];
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util.selectiveDeepExtend(fields,this.options, options);
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}
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}
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/**
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* handles the selection part of the tap;
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*
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* @param {{x: number, y: number}} pointer
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* @returns {boolean}
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*/
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selectOnPoint(pointer) {
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let selected = false;
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if (this.options.selectable === true) {
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let obj = this.getNodeAt(pointer) || this.getEdgeAt(pointer);
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// unselect after getting the objects in order to restore width and height.
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this.unselectAll();
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if (obj !== undefined) {
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selected = this.selectObject(obj);
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}
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this.body.emitter.emit("_requestRedraw");
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}
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return selected;
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}
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selectAdditionalOnPoint(pointer) {
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let selectionChanged = false;
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if (this.options.selectable === true) {
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let obj = this.getNodeAt(pointer) || this.getEdgeAt(pointer);
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if (obj !== undefined) {
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selectionChanged = true;
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if (obj.isSelected() === true) {
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this.deselectObject(obj);
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}
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else {
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this.selectObject(obj);
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}
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this.body.emitter.emit("_requestRedraw");
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}
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}
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return selectionChanged;
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}
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/**
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* Create an object containing the standard fields for an event.
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*
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* @param {Event} event
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* @param {{x: number, y: number}} pointer Object with the x and y screen coordinates of the mouse
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* @returns {{}}
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* @private
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*/
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_initBaseEvent(event, pointer) {
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let properties = {};
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properties['pointer'] = {
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DOM: {x: pointer.x, y: pointer.y},
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canvas: this.canvas.DOMtoCanvas(pointer)
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};
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properties['event'] = event;
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return properties;
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}
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/**
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* Generate an event which the user can catch.
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*
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* This adds some extra data to the event with respect to cursor position and
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* selected nodes and edges.
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*
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* @param {String} eventType Name of event to send
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* @param {Event} event
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* @param {{x: number, y: number}} pointer Object with the x and y screen coordinates of the mouse
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* @param {Object|undefined} oldSelection If present, selection state before event occured
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* @param {boolean|undefined} [emptySelection=false] Indicate if selection data should be passed
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*/
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_generateClickEvent(eventType, event, pointer, oldSelection, emptySelection = false) {
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let properties = this._initBaseEvent(event, pointer);
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if (emptySelection === true) {
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properties.nodes = [];
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properties.edges = [];
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}
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else {
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let tmp = this.getSelection();
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properties.nodes = tmp.nodes;
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properties.edges = tmp.edges;
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}
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if (oldSelection !== undefined) {
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properties['previousSelection'] = oldSelection;
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}
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this.body.emitter.emit(eventType, properties);
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}
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selectObject(obj, highlightEdges = this.options.selectConnectedEdges) {
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if (obj !== undefined) {
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if (obj instanceof Node) {
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if (highlightEdges === true) {
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this._selectConnectedEdges(obj);
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}
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}
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obj.select();
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this._addToSelection(obj);
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return true;
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}
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return false;
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}
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deselectObject(obj) {
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if (obj.isSelected() === true) {
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obj.selected = false;
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this._removeFromSelection(obj);
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}
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}
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/**
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* retrieve all nodes overlapping with given object
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* @param {Object} object An object with parameters left, top, right, bottom
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* @return {Number[]} An array with id's of the overlapping nodes
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* @private
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*/
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_getAllNodesOverlappingWith(object) {
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let overlappingNodes = [];
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let nodes = this.body.nodes;
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for (let i = 0; i < this.body.nodeIndices.length; i++) {
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let nodeId = this.body.nodeIndices[i];
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if (nodes[nodeId].isOverlappingWith(object)) {
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overlappingNodes.push(nodeId);
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}
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}
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return overlappingNodes;
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}
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/**
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* Return a position object in canvasspace from a single point in screenspace
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*
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* @param {{x: number, y: number}} pointer
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* @returns {{left: number, top: number, right: number, bottom: number}}
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* @private
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*/
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_pointerToPositionObject(pointer) {
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let canvasPos = this.canvas.DOMtoCanvas(pointer);
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return {
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left: canvasPos.x - 1,
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top: canvasPos.y + 1,
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right: canvasPos.x + 1,
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bottom: canvasPos.y - 1
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};
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}
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/**
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* Get the top node at the passed point (like a click)
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*
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* @param {{x: Number, y: Number}} pointer
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* @param {boolean} [returnNode=true]
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* @return {Node | undefined} node
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*/
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getNodeAt(pointer, returnNode = true) {
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// we first check if this is an navigation controls element
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let positionObject = this._pointerToPositionObject(pointer);
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let overlappingNodes = this._getAllNodesOverlappingWith(positionObject);
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// if there are overlapping nodes, select the last one, this is the
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// one which is drawn on top of the others
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if (overlappingNodes.length > 0) {
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if (returnNode === true) {
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return this.body.nodes[overlappingNodes[overlappingNodes.length - 1]];
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}
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else {
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return overlappingNodes[overlappingNodes.length - 1];
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}
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}
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else {
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return undefined;
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}
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}
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/**
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* retrieve all edges overlapping with given object, selector is around center
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* @param {Object} object An object with parameters left, top, right, bottom
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* @param {Number[]} overlappingEdges An array with id's of the overlapping nodes
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* @private
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*/
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_getEdgesOverlappingWith(object, overlappingEdges) {
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let edges = this.body.edges;
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for (let i = 0; i < this.body.edgeIndices.length; i++) {
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let edgeId = this.body.edgeIndices[i];
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if (edges[edgeId].isOverlappingWith(object)) {
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overlappingEdges.push(edgeId);
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}
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}
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}
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/**
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* retrieve all nodes overlapping with given object
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* @param {Object} object An object with parameters left, top, right, bottom
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* @return {Number[]} An array with id's of the overlapping nodes
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* @private
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*/
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_getAllEdgesOverlappingWith(object) {
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let overlappingEdges = [];
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this._getEdgesOverlappingWith(object,overlappingEdges);
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return overlappingEdges;
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}
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/**
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* Get the edges nearest to the passed point (like a click)
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*
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* @param {{x: Number, y: Number}} pointer
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* @param {boolean} [returnEdge=true]
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* @return {Edge | undefined} node
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*/
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getEdgeAt(pointer, returnEdge = true) {
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// Iterate over edges, pick closest within 10
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var canvasPos = this.canvas.DOMtoCanvas(pointer);
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var mindist = 10;
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var overlappingEdge = null;
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var edges = this.body.edges;
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for (var i = 0; i < this.body.edgeIndices.length; i++) {
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var edgeId = this.body.edgeIndices[i];
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var edge = edges[edgeId];
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if (edge.connected) {
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var xFrom = edge.from.x;
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var yFrom = edge.from.y;
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var xTo = edge.to.x;
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var yTo = edge.to.y;
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var dist = edge.edgeType.getDistanceToEdge(xFrom, yFrom, xTo, yTo, canvasPos.x, canvasPos.y);
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if(dist < mindist){
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overlappingEdge = edgeId;
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mindist = dist;
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}
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}
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}
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if (overlappingEdge !== null) {
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if (returnEdge === true) {
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return this.body.edges[overlappingEdge];
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}
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else {
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return overlappingEdge;
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}
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}
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else {
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return undefined;
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}
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}
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/**
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* Add object to the selection array.
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*
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* @param {Object} obj
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* @private
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*/
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_addToSelection(obj) {
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if (obj instanceof Node) {
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this.selectionObj.nodes[obj.id] = obj;
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}
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else {
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this.selectionObj.edges[obj.id] = obj;
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}
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}
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/**
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* Add object to the selection array.
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*
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* @param {Object} obj
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* @private
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*/
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_addToHover(obj) {
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if (obj instanceof Node) {
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this.hoverObj.nodes[obj.id] = obj;
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}
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else {
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this.hoverObj.edges[obj.id] = obj;
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}
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}
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/**
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* Remove a single option from selection.
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*
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* @param {Object} obj
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* @private
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*/
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_removeFromSelection(obj) {
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if (obj instanceof Node) {
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delete this.selectionObj.nodes[obj.id];
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this._unselectConnectedEdges(obj);
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}
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else {
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delete this.selectionObj.edges[obj.id];
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}
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}
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/**
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* Unselect all. The selectionObj is useful for this.
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*/
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unselectAll() {
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for(let nodeId in this.selectionObj.nodes) {
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if(this.selectionObj.nodes.hasOwnProperty(nodeId)) {
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this.selectionObj.nodes[nodeId].unselect();
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}
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}
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for(let edgeId in this.selectionObj.edges) {
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if(this.selectionObj.edges.hasOwnProperty(edgeId)) {
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this.selectionObj.edges[edgeId].unselect();
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}
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}
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this.selectionObj = {nodes:{},edges:{}};
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}
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/**
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* return the number of selected nodes
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*
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* @returns {number}
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* @private
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*/
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_getSelectedNodeCount() {
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let count = 0;
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for (let nodeId in this.selectionObj.nodes) {
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if (this.selectionObj.nodes.hasOwnProperty(nodeId)) {
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count += 1;
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}
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}
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return count;
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}
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/**
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* return the selected node
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*
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* @returns {number}
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* @private
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*/
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_getSelectedNode() {
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for (let nodeId in this.selectionObj.nodes) {
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if (this.selectionObj.nodes.hasOwnProperty(nodeId)) {
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return this.selectionObj.nodes[nodeId];
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}
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}
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return undefined;
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}
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/**
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* return the selected edge
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*
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* @returns {number}
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* @private
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*/
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_getSelectedEdge() {
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for (let edgeId in this.selectionObj.edges) {
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if (this.selectionObj.edges.hasOwnProperty(edgeId)) {
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return this.selectionObj.edges[edgeId];
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}
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}
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return undefined;
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}
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/**
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* return the number of selected edges
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*
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* @returns {number}
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* @private
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*/
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_getSelectedEdgeCount() {
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let count = 0;
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for (let edgeId in this.selectionObj.edges) {
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if (this.selectionObj.edges.hasOwnProperty(edgeId)) {
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count += 1;
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}
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}
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return count;
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}
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/**
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* return the number of selected objects.
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*
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* @returns {number}
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* @private
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*/
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_getSelectedObjectCount() {
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let count = 0;
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for(let nodeId in this.selectionObj.nodes) {
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if(this.selectionObj.nodes.hasOwnProperty(nodeId)) {
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count += 1;
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}
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}
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for(let edgeId in this.selectionObj.edges) {
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if(this.selectionObj.edges.hasOwnProperty(edgeId)) {
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count += 1;
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}
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}
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return count;
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}
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/**
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* Check if anything is selected
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*
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* @returns {boolean}
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* @private
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*/
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_selectionIsEmpty() {
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for(let nodeId in this.selectionObj.nodes) {
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if(this.selectionObj.nodes.hasOwnProperty(nodeId)) {
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return false;
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}
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}
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for(let edgeId in this.selectionObj.edges) {
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if(this.selectionObj.edges.hasOwnProperty(edgeId)) {
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return false;
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}
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}
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return true;
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}
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/**
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* check if one of the selected nodes is a cluster.
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*
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* @returns {boolean}
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* @private
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*/
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_clusterInSelection() {
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for(let nodeId in this.selectionObj.nodes) {
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if(this.selectionObj.nodes.hasOwnProperty(nodeId)) {
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if (this.selectionObj.nodes[nodeId].clusterSize > 1) {
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return true;
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}
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}
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}
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return false;
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}
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/**
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* select the edges connected to the node that is being selected
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*
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* @param {Node} node
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* @private
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*/
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_selectConnectedEdges(node) {
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for (let i = 0; i < node.edges.length; i++) {
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let edge = node.edges[i];
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edge.select();
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this._addToSelection(edge);
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}
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}
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/**
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* select the edges connected to the node that is being selected
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*
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* @param {Node} node
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* @private
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*/
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_hoverConnectedEdges(node) {
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for (let i = 0; i < node.edges.length; i++) {
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let edge = node.edges[i];
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edge.hover = true;
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this._addToHover(edge);
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}
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}
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/**
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* unselect the edges connected to the node that is being selected
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*
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* @param {Node} node
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* @private
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*/
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_unselectConnectedEdges(node) {
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for (let i = 0; i < node.edges.length; i++) {
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let edge = node.edges[i];
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edge.unselect();
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this._removeFromSelection(edge);
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}
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}
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/**
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* Remove the highlight from a node or edge, in response to mouse movement
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*
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* @param {Event} event
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* @param {{x: number, y: number}} pointer object with the x and y screen coordinates of the mouse
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* @param {vis.Node|vis.Edge} object
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* @private
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*/
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emitBlurEvent(event, pointer, object) {
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let properties = this._initBaseEvent(event, pointer);
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if (object.hover === true) {
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object.hover = false;
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if (object instanceof Node) {
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properties.node = object.id;
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this.body.emitter.emit("blurNode", properties);
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}
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else {
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properties.edge = object.id;
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this.body.emitter.emit("blurEdge", properties);
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}
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}
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}
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/**
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* Create the highlight for a node or edge, in response to mouse movement
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*
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* @param {Event} event
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* @param {{x: number, y: number}} pointer object with the x and y screen coordinates of the mouse
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* @param {vis.Node|vis.Edge} object
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* @returns {boolean} hoverChanged
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* @private
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*/
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emitHoverEvent(event, pointer, object) {
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let properties = this._initBaseEvent(event, pointer);
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let hoverChanged = false;
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if (object.hover === false) {
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object.hover = true;
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this._addToHover(object);
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hoverChanged = true;
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if (object instanceof Node) {
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properties.node = object.id;
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this.body.emitter.emit("hoverNode", properties);
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}
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else {
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properties.edge = object.id;
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this.body.emitter.emit("hoverEdge", properties);
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}
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}
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return hoverChanged;
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}
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/**
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* Perform actions in response to a mouse movement.
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*
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* @param {Event} event
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* @param {{x: number, y: number}} pointer | object with the x and y screen coordinates of the mouse
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*/
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hoverObject(event, pointer) {
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let object = this.getNodeAt(pointer);
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if (object === undefined) {
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object = this.getEdgeAt(pointer);
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}
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let hoverChanged = false;
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// remove all node hover highlights
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for (let nodeId in this.hoverObj.nodes) {
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if (this.hoverObj.nodes.hasOwnProperty(nodeId)) {
|
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if (object === undefined || (object instanceof Node && object.id != nodeId) || object instanceof Edge) {
|
|
this.emitBlurEvent(event, pointer, this.hoverObj.nodes[nodeId]);
|
|
delete this.hoverObj.nodes[nodeId];
|
|
hoverChanged = true;
|
|
}
|
|
}
|
|
}
|
|
|
|
// removing all edge hover highlights
|
|
for (let edgeId in this.hoverObj.edges) {
|
|
if (this.hoverObj.edges.hasOwnProperty(edgeId)) {
|
|
// if the hover has been changed here it means that the node has been hovered over or off
|
|
// we then do not use the emitBlurEvent method here.
|
|
if (hoverChanged === true) {
|
|
this.hoverObj.edges[edgeId].hover = false;
|
|
delete this.hoverObj.edges[edgeId];
|
|
}
|
|
// if the blur remains the same and the object is undefined (mouse off) or another
|
|
// edge has been hovered, or another node has been hovered we blur the edge.
|
|
else if (object === undefined || (object instanceof Edge && object.id != edgeId) || (object instanceof Node && !object.hover)) {
|
|
this.emitBlurEvent(event, pointer, this.hoverObj.edges[edgeId]);
|
|
delete this.hoverObj.edges[edgeId];
|
|
hoverChanged = true;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (object !== undefined) {
|
|
hoverChanged = hoverChanged || this.emitHoverEvent(event, pointer, object);
|
|
if (object instanceof Node && this.options.hoverConnectedEdges === true) {
|
|
this._hoverConnectedEdges(object);
|
|
}
|
|
}
|
|
|
|
if (hoverChanged === true) {
|
|
this.body.emitter.emit('_requestRedraw');
|
|
}
|
|
}
|
|
|
|
|
|
|
|
|
|
/**
|
|
*
|
|
* 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.selectable === true) {
|
|
for (let nodeId in this.selectionObj.nodes) {
|
|
if (this.selectionObj.nodes.hasOwnProperty(nodeId)) {
|
|
idArray.push(this.selectionObj.nodes[nodeId].id);
|
|
}
|
|
}
|
|
}
|
|
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.selectable === true) {
|
|
for (let edgeId in this.selectionObj.edges) {
|
|
if (this.selectionObj.edges.hasOwnProperty(edgeId)) {
|
|
idArray.push(this.selectionObj.edges[edgeId].id);
|
|
}
|
|
}
|
|
}
|
|
return idArray;
|
|
}
|
|
|
|
/**
|
|
* Updates the current selection
|
|
* @param {{nodes: Array.<String>, edges: Array.<String>}} selection
|
|
* @param {Object} options Options
|
|
*/
|
|
setSelection(selection, options = {}) {
|
|
let i, id;
|
|
|
|
if (!selection || (!selection.nodes && !selection.edges))
|
|
throw 'Selection must be an object with nodes and/or edges properties';
|
|
// first unselect any selected node, if option is true or undefined
|
|
if (options.unselectAll || options.unselectAll === undefined) {
|
|
this.unselectAll();
|
|
}
|
|
if (selection.nodes) {
|
|
for (i = 0; i < selection.nodes.length; i++) {
|
|
id = selection.nodes[i];
|
|
|
|
let node = this.body.nodes[id];
|
|
if (!node) {
|
|
throw new RangeError('Node with id "' + id + '" not found');
|
|
}
|
|
// don't select edges with it
|
|
this.selectObject(node, options.highlightEdges);
|
|
}
|
|
}
|
|
|
|
if (selection.edges) {
|
|
for (i = 0; i < selection.edges.length; i++) {
|
|
id = selection.edges[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');
|
|
}
|
|
|
|
|
|
/**
|
|
* 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) {
|
|
if (!selection || (selection.length === undefined))
|
|
throw 'Selection must be an array with ids';
|
|
|
|
this.setSelection({nodes: selection}, {highlightEdges: highlightEdges});
|
|
}
|
|
|
|
|
|
/**
|
|
* select zero or more edges
|
|
* @param {Number[] | String[]} selection An array with the ids of the
|
|
* selected nodes.
|
|
*/
|
|
selectEdges(selection) {
|
|
if (!selection || (selection.length === undefined))
|
|
throw 'Selection must be an array with ids';
|
|
|
|
this.setSelection({edges: selection});
|
|
}
|
|
|
|
/**
|
|
* 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;
|