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640 lines
15 KiB
640 lines
15 KiB
/**
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* Created by Alex on 2/27/2015.
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*/
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var Node = require("../../Node");
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class SelectionHandler {
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constructor(body) {
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this.body = body;
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this.selectionObj = {nodes:[], edges:[]};
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this.options = {
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select: true,
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selectConnectedEdges: true
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}
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}
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setCanvas(canvas) {
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this.canvas = canvas;
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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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if (this.options.select === true) {
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if (this._getSelectedObjectCount() > 0) {this._unselectAll();}
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this.selectObject(pointer);
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this._generateClickEvent(pointer);
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this.body.emitter.emit("_requestRedraw");
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}
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}
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_generateClickEvent(pointer) {
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var 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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this.body.emitter.emit("click", properties);
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}
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selectObject(pointer) {
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var obj = this._getNodeAt(pointer);
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if (obj != null) {
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if (this.options.selectConnectedEdges === true) {
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this._selectConnectedEdges(obj);
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}
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}
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else {
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obj = this._getEdgeAt(pointer);
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}
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if (obj !== null) {
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obj.select();
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this._addToSelection(obj);
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this.body.emitter.emit('selected', this.getSelection())
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}
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return obj;
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}
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/**
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*
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* @param object
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* @param overlappingNodes
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* @private
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*/
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_getNodesOverlappingWith(object, overlappingNodes) {
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var nodes = this.body.nodes;
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for (var nodeId in nodes) {
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if (nodes.hasOwnProperty(nodeId)) {
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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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}
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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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var overlappingNodes = [];
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this._getNodesOverlappingWith(object,overlappingNodes);
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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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var canvasPos = this.canvas.DOMtoCanvas(pointer);
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return {
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left: canvasPos.x,
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top: canvasPos.y,
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right: canvasPos.x,
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bottom: canvasPos.y
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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 | null} 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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var positionObject = this._pointerToPositionObject(pointer);
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var 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 null;
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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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var edges = this.body.edges;
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for (var edgeId in edges) {
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if (edges.hasOwnProperty(edgeId)) {
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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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/**
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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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var 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 {null}
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* @private
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*/
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_getEdgeAt(pointer) {
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var positionObject = this._pointerToPositionObject(pointer);
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var 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 null;
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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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* @param {Boolean} [doNotTrigger] | ignore trigger
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* @private
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*/
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_unselectAll(doNotTrigger = false) {
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for(var 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(var 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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if (doNotTrigger == false) {
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this.body.emitter.emit('select', this.getSelection());
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}
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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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var count = 0;
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for (var 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 (var 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 null;
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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 (var 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 null;
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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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var count = 0;
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for (var 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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var count = 0;
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for(var 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(var 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(var 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(var 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(var 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 (var i = 0; i < node.edges.length; i++) {
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var 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 (var i = 0; i < node.edges.length; i++) {
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var 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 (var i = 0; i < node.edges.length; i++) {
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var 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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* handles the selection part of the double tap and opens a cluster if needed
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*
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* @param {Object} pointer
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* @private
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*/
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_handleDoubleTap(pointer) {
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var node = this._getNodeAt(pointer);
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if (node != null && node !== undefined) {
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// we reset the areaCenter here so the opening of the node will occur
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this.areaCenter = {"x" : this._XconvertDOMtoCanvas(pointer.x),
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"y" : this._YconvertDOMtoCanvas(pointer.y)};
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this.openCluster(node);
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}
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var 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: {x: this._XconvertDOMtoCanvas(pointer.x), y: this._YconvertDOMtoCanvas(pointer.y)}
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}
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this.body.emitter.emit("doubleClick", properties);
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}
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/**
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* Handle the onHold selection part
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*
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* @param pointer
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* @private
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*/
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_handleOnHold(pointer) {
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var node = this._getNodeAt(pointer);
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if (node != null) {
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this._selectObject(node,true);
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}
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else {
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var edge = this._getEdgeAt(pointer);
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if (edge != null) {
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this._selectObject(edge,true);
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}
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}
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this._requestRedraw();
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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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var nodeIds = this.getSelectedNodes();
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var 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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var idArray = [];
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if (this.options.select == true) {
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for (var 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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var idArray = [];
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if (this.options.select == true) {
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for (var 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) {
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var i, iMax, 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(true);
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for (i = 0, iMax = selection.length; i < iMax; i++) {
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id = selection[i];
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var 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,true,true,highlightEdges,true);
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}
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this.redraw();
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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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var i, iMax, 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(true);
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for (i = 0, iMax = selection.length; i < iMax; i++) {
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id = selection[i];
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var edge = this.body.edges[id];
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if (!edge) {
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throw new RangeError('Edge with id "' + id + '" not found');
|
|
}
|
|
this._selectObject(edge,true,true,false,true);
|
|
}
|
|
this.redraw();
|
|
}
|
|
|
|
/**
|
|
* Validate the selection: remove ids of nodes which no longer exist
|
|
* @private
|
|
*/
|
|
_updateSelection() {
|
|
for (var nodeId in this.selectionObj.nodes) {
|
|
if (this.selectionObj.nodes.hasOwnProperty(nodeId)) {
|
|
if (!this.body.nodes.hasOwnProperty(nodeId)) {
|
|
delete this.selectionObj.nodes[nodeId];
|
|
}
|
|
}
|
|
}
|
|
for (var edgeId in this.selectionObj.edges) {
|
|
if (this.selectionObj.edges.hasOwnProperty(edgeId)) {
|
|
if (!this.body.edges.hasOwnProperty(edgeId)) {
|
|
delete this.selectionObj.edges[edgeId];
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
export {SelectionHandler};
|