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615 lines
14 KiB
615 lines
14 KiB
let Node = require("./components/Node");
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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.options = {};
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this.defaultOptions = {
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select: true,
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selectConnectedEdges: 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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util.deepExtend(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 {Object} pointer
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* @private
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*/
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selectOnPoint(pointer) {
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let selected = false;
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if (this.options.select === true) {
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this.unselectAll();
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let obj = this.getNodeAt(pointer) || this.getEdgeAt(pointer);;
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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.select === 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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_generateClickEvent(eventType, pointer, oldSelection) {
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let properties = this.getSelection();
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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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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 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 a specific point (like a click)
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*
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* @param {{x: Number, y: Number}} pointer
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* @return {Node | undefined} node
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* @private
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*/
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getNodeAt(pointer) {
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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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return this.body.nodes[overlappingNodes[overlappingNodes.length - 1]];
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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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* @return {Number[]} 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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* Place holder. To implement change the getNodeAt to a _getObjectAt. Have the _getObjectAt call
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* getNodeAt and _getEdgesAt, then priortize the selection to user preferences.
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*
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* @param pointer
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* @returns {undefined}
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* @private
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*/
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getEdgeAt(pointer) {
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let positionObject = this._pointerToPositionObject(pointer);
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let overlappingEdges = this._getAllEdgesOverlappingWith(positionObject);
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if (overlappingEdges.length > 0) {
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return this.body.edges[overlappingEdges[overlappingEdges.length - 1]];
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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 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 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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}
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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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* @private
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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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* This is called when someone clicks on a node. either select or deselect it.
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* If there is an existing selection and we don't want to append to it, clear the existing selection
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*
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* @param {Node || Edge} object
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* @private
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*/
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blurObject(object) {
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if (object.hover === true) {
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object.hover = false;
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this.body.emitter.emit("blurNode",{node:object.id});
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}
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}
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/**
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* This is called when someone clicks on a node. either select or deselect it.
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* If there is an existing selection and we don't want to append to it, clear the existing selection
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*
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* @param {Node || Edge} object
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* @private
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*/
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hoverObject(object) {
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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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if (object instanceof Node) {
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this.body.emitter.emit("hoverNode",{node:object.id});
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}
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}
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if (object instanceof Node) {
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this._hoverConnectedEdges(object);
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}
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}
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/**
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*
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* retrieve the currently selected objects
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* @return {{nodes: Array.<String>, edges: Array.<String>}} selection
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*/
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getSelection() {
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let nodeIds = this.getSelectedNodes();
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let edgeIds = this.getSelectedEdges();
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return {nodes:nodeIds, edges:edgeIds};
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}
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/**
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*
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* retrieve the currently selected nodes
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* @return {String[]} selection An array with the ids of the
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* selected nodes.
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*/
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getSelectedNodes() {
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let idArray = [];
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if (this.options.select === true) {
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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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idArray.push(nodeId);
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}
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}
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}
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return idArray;
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}
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/**
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*
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* retrieve the currently selected edges
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* @return {Array} selection An array with the ids of the
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* selected nodes.
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*/
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getSelectedEdges() {
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let idArray = [];
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if (this.options.select === true) {
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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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idArray.push(edgeId);
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}
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}
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}
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return idArray;
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}
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/**
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* select zero or more nodes with the option to highlight edges
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* @param {Number[] | String[]} selection An array with the ids of the
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* selected nodes.
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* @param {boolean} [highlightEdges]
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*/
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selectNodes(selection, highlightEdges = true) {
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let i, id;
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if (!selection || (selection.length === undefined))
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throw 'Selection must be an array with ids';
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// first unselect any selected node
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this.unselectAll();
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for (i = 0; i < selection.length; i++) {
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id = selection[i];
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let node = this.body.nodes[id];
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if (!node) {
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throw new RangeError('Node with id "' + id + '" not found');
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}
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this.selectObject(node,highlightEdges);
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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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* select zero or more edges
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* @param {Number[] | String[]} selection An array with the ids of the
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* selected nodes.
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*/
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selectEdges(selection) {
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let i, id;
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if (!selection || (selection.length === undefined))
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throw 'Selection must be an array with ids';
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// first unselect any selected objects
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this.unselectAll();
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for (i = 0; i < selection.length; i++) {
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id = selection[i];
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let edge = this.body.edges[id];
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if (!edge) {
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throw new RangeError('Edge with id "' + id + '" not found');
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}
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this.selectObject(edge);
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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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* Validate the selection: remove ids of nodes which no longer exist
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* @private
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*/
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updateSelection() {
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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.body.nodes.hasOwnProperty(nodeId)) {
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delete this.selectionObj.nodes[nodeId];
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}
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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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if (!this.body.edges.hasOwnProperty(edgeId)) {
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delete this.selectionObj.edges[edgeId];
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}
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}
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}
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}
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}
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export default SelectionHandler;
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