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489 lines
14 KiB
489 lines
14 KiB
/**
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* Created by Alex on 2/27/2015.
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*
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*/
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var util = require('../../util');
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import { NavigationHandler } from "./components/NavigationHandler"
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class InteractionHandler {
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constructor(body, canvas, selectionHandler) {
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this.body = body;
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this.canvas = canvas;
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this.selectionHandler = selectionHandler;
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this.navigationHandler = new NavigationHandler(body,canvas);
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// bind the events from hammer to functions in this object
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this.body.eventListeners.onTap = this.onTap.bind(this);
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this.body.eventListeners.onTouch = this.onTouch.bind(this);
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this.body.eventListeners.onDoubleTap = this.onDoubleTap.bind(this);
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this.body.eventListeners.onHold = this.onHold.bind(this);
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this.body.eventListeners.onDragStart = this.onDragStart.bind(this);
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this.body.eventListeners.onDrag = this.onDrag.bind(this);
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this.body.eventListeners.onDragEnd = this.onDragEnd.bind(this);
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this.body.eventListeners.onMouseWheel = this.onMouseWheel.bind(this);
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this.body.eventListeners.onPinch = this.onPinch.bind(this);
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this.body.eventListeners.onMouseMove = this.onMouseMove.bind(this);
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this.body.eventListeners.onRelease = this.onRelease.bind(this);
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this.touchTime = 0;
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this.drag = {};
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this.pinch = {};
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this.pointerPosition = {x:0,y:0};
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this.hoverObj = {nodes:{},edges:{}};
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this.options = {};
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this.defaultOptions = {
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dragNodes:true,
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dragView: true,
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zoomView: true,
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hoverEnabled: false,
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showNavigationIcons: false,
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tooltip: {
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delay: 300,
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fontColor: 'black',
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fontSize: 14, // px
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fontFace: 'verdana',
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color: {
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border: '#666',
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background: '#FFFFC6'
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}
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},
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keyboard: {
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enabled: false,
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speed: {x: 10, y: 10, zoom: 0.02},
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bindToWindow: true
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}
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}
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util.extend(this.options,this.defaultOptions);
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}
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setOptions(options) {
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if (options !== undefined) {
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// extend all but the values in fields
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var fields = ['keyboard'];
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util.selectiveNotDeepExtend(fields,this.options, options);
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// merge the keyboard options in.
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util.mergeOptions(this.options, options, 'keyboard');
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}
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this.navigationHandler.setOptions(this.options);
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}
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/**
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* Get the pointer location from a touch location
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* @param {{x: Number, y: Number}} touch
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* @return {{x: Number, y: Number}} pointer
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* @private
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*/
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getPointer(touch) {
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return {
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x: touch.x - util.getAbsoluteLeft(this.canvas.frame.canvas),
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y: touch.y - util.getAbsoluteTop(this.canvas.frame.canvas)
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};
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}
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/**
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* On start of a touch gesture, store the pointer
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* @param event
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* @private
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*/
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onTouch(event) {
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if (new Date().valueOf() - this.touchTime > 100) {
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this.drag.pointer = this.getPointer(event.center);
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this.drag.pinched = false;
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this.pinch.scale = this.body.view.scale;
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// to avoid double fireing of this event because we have two hammer instances. (on canvas and on frame)
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this.touchTime = new Date().valueOf();
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}
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}
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/**
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* handle tap/click event: select/unselect a node
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* @private
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*/
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onTap(event) {
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var pointer = this.getPointer(event.center);
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var previouslySelected = this.selectionHandler._getSelectedObjectCount() > 0;
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var selected = this.selectionHandler.selectOnPoint(pointer);
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if (selected === true || (previouslySelected == true && selected === false)) { // select or unselect
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this.body.emitter.emit('select', this.selectionHandler.getSelection());
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}
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this.selectionHandler._generateClickEvent("click",pointer);
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}
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/**
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* handle doubletap event
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* @private
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*/
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onDoubleTap(event) {
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var pointer = this.getPointer(event.center);
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this.selectionHandler._generateClickEvent("doubleClick",pointer);
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}
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/**
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* handle long tap event: multi select nodes
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* @private
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*/
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onHold(event) {
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var pointer = this.getPointer(event.center);
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var selectionChanged = this.selectionHandler.selectAdditionalOnPoint(pointer);
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if (selectionChanged === true) { // select or longpress
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this.body.emitter.emit('select', this.selectionHandler.getSelection());
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}
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this.selectionHandler._generateClickEvent("click",pointer);
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}
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/**
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* handle the release of the screen
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*
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* @private
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*/
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onRelease(event) {
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this.body.emitter.emit("release",event)
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}
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/**
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* This function is called by onDragStart.
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* It is separated out because we can then overload it for the datamanipulation system.
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*
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* @private
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*/
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onDragStart(event) {
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//in case the touch event was triggered on an external div, do the initial touch now.
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if (this.drag.pointer === undefined) {
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this.onTouch(event);
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}
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var node = this.selectionHandler.getNodeAt(this.drag.pointer);
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// note: drag.pointer is set in onTouch to get the initial touch location
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this.drag.dragging = true;
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this.drag.selection = [];
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this.drag.translation = util.extend({},this.body.view.translation); // copy the object
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this.drag.nodeId = null;
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this.body.emitter.emit("dragStart", {nodeIds: this.selectionHandler.getSelection().nodes});
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if (node != null && this.options.dragNodes === true) {
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this.drag.nodeId = node.id;
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// select the clicked node if not yet selected
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if (node.isSelected() === false) {
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this.selectionHandler.unselectAll();
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this.selectionHandler.selectObject(node);
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}
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var selection = this.selectionHandler.selectionObj.nodes;
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// create an array with the selected nodes and their original location and status
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for (let nodeId in selection) {
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if (selection.hasOwnProperty(nodeId)) {
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var object = selection[nodeId];
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var s = {
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id: object.id,
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node: object,
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// store original x, y, xFixed and yFixed, make the node temporarily Fixed
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x: object.x,
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y: object.y,
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xFixed: object.xFixed,
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yFixed: object.yFixed
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};
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object.xFixed = true;
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object.yFixed = true;
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this.drag.selection.push(s);
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}
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}
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}
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}
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/**
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* handle drag event
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* @private
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*/
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onDrag(event) {
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if (this.drag.pinched === true) {
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return;
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}
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// remove the focus on node if it is focussed on by the focusOnNode
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this.body.emitter.emit("unlockNode");
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var pointer = this.getPointer(event.center);
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var selection = this.drag.selection;
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if (selection && selection.length && this.options.dragNodes === true) {
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// calculate delta's and new location
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var deltaX = pointer.x - this.drag.pointer.x;
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var deltaY = pointer.y - this.drag.pointer.y;
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// update position of all selected nodes
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selection.forEach((selection) => {
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var node = selection.node;
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if (!selection.xFixed) {
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node.x = this.canvas._XconvertDOMtoCanvas(this.canvas._XconvertCanvasToDOM(selection.x) + deltaX);
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}
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if (!selection.yFixed) {
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node.y = this.canvas._YconvertDOMtoCanvas(this.canvas._YconvertCanvasToDOM(selection.y) + deltaY);
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}
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});
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// start the simulation of the physics
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this.body.emitter.emit("startSimulation");
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}
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else {
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// move the network
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if (this.options.dragView === true) {
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// if the drag was not started properly because the click started outside the network div, start it now.
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if (this.drag.pointer === undefined) {
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this._handleDragStart(event);
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return;
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}
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var diffX = pointer.x - this.drag.pointer.x;
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var diffY = pointer.y - this.drag.pointer.y;
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this.body.view.translation = {x:this.drag.translation.x + diffX, y:this.drag.translation.y + diffY};
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this.body.emitter.emit("_redraw");
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}
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}
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}
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/**
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* handle drag start event
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* @private
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*/
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onDragEnd(event) {
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this.drag.dragging = false;
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var selection = this.drag.selection;
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if (selection && selection.length) {
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selection.forEach(function (s) {
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// restore original xFixed and yFixed
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s.node.xFixed = s.xFixed;
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s.node.yFixed = s.yFixed;
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});
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this.body.emitter.emit("startSimulation");
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}
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else {
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this.body.emitter.emit("_requestRedraw");
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}
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this.body.emitter.emit("dragEnd", {nodeIds: this.selectionHandler.getSelection().nodes});
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}
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/**
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* Handle pinch event
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* @param event
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* @private
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*/
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onPinch(event) {
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var pointer = this.getPointer(event.center);
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this.drag.pinched = true;
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if (this.pinch['scale'] === undefined) {
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this.pinch.scale = 1;
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}
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// TODO: enabled moving while pinching?
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var scale = this.pinch.scale * event.scale;
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this.zoom(scale, pointer)
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}
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/**
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* Zoom the network in or out
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* @param {Number} scale a number around 1, and between 0.01 and 10
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* @param {{x: Number, y: Number}} pointer Position on screen
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* @return {Number} appliedScale scale is limited within the boundaries
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* @private
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*/
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zoom(scale, pointer) {
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if (this.options.zoomView === true) {
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var scaleOld = this.body.view.scale;
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if (scale < 0.00001) {
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scale = 0.00001;
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}
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if (scale > 10) {
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scale = 10;
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}
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var preScaleDragPointer = null;
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if (this.drag !== undefined) {
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if (this.drag.dragging === true) {
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preScaleDragPointer = this.canvas.DOMtoCanvas(this.drag.pointer);
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}
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}
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// + this.canvas.frame.canvas.clientHeight / 2
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var translation = this.body.view.translation;
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var scaleFrac = scale / scaleOld;
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var tx = (1 - scaleFrac) * pointer.x + translation.x * scaleFrac;
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var ty = (1 - scaleFrac) * pointer.y + translation.y * scaleFrac;
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this.body.view.scale = scale;
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this.body.view.translation = {x:tx, y:ty};
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if (preScaleDragPointer != null) {
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var postScaleDragPointer = this.canvas.canvasToDOM(preScaleDragPointer);
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this.drag.pointer.x = postScaleDragPointer.x;
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this.drag.pointer.y = postScaleDragPointer.y;
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}
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this.body.emitter.emit("_requestRedraw");
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if (scaleOld < scale) {
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this.body.emitter.emit("zoom", {direction: "+"});
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}
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else {
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this.body.emitter.emit("zoom", {direction: "-"});
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}
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}
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}
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/**
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* Event handler for mouse wheel event, used to zoom the timeline
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* See http://adomas.org/javascript-mouse-wheel/
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* https://github.com/EightMedia/hammer.js/issues/256
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* @param {MouseEvent} event
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* @private
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*/
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onMouseWheel(event) {
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// retrieve delta
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var delta = 0;
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if (event.wheelDelta) { /* IE/Opera. */
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delta = event.wheelDelta / 120;
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} else if (event.detail) { /* Mozilla case. */
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// In Mozilla, sign of delta is different than in IE.
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// Also, delta is multiple of 3.
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delta = -event.detail / 3;
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}
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// If delta is nonzero, handle it.
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// Basically, delta is now positive if wheel was scrolled up,
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// and negative, if wheel was scrolled down.
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if (delta) {
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// calculate the new scale
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var scale = this.body.view.scale;
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var zoom = delta / 10;
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if (delta < 0) {
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zoom = zoom / (1 - zoom);
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}
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scale *= (1 + zoom);
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// calculate the pointer location
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var pointer = {x:event.pageX, y:event.pageY};
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// apply the new scale
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this.zoom(scale, pointer);
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}
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// Prevent default actions caused by mouse wheel.
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event.preventDefault();
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}
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/**
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* Mouse move handler for checking whether the title moves over a node with a title.
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* @param {Event} event
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* @private
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*/
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onMouseMove(event) {
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// var pointer = {x:event.pageX, y:event.pageY};
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// var popupVisible = false;
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//
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// // check if the previously selected node is still selected
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// if (this.popup !== undefined) {
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// if (this.popup.hidden === false) {
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// this._checkHidePopup(pointer);
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// }
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//
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// // if the popup was not hidden above
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// if (this.popup.hidden === false) {
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// popupVisible = true;
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// this.popup.setPosition(pointer.x + 3, pointer.y - 5)
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// this.popup.show();
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// }
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// }
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//
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// // if we bind the keyboard to the div, we have to highlight it to use it. This highlights it on mouse over
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// if (this.options.keyboard.bindToWindow == false && this.options.keyboard.enabled === true) {
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// this.canvas.frame.focus();
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// }
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//
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// // start a timeout that will check if the mouse is positioned above an element
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// if (popupVisible === false) {
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// var me = this;
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// var checkShow = function() {
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// me._checkShowPopup(pointer);
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// };
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//
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// if (this.popupTimer) {
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// clearInterval(this.popupTimer); // stop any running calculationTimer
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// }
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// if (!this.drag.dragging) {
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// this.popupTimer = setTimeout(checkShow, this.options.tooltip.delay);
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// }
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// }
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//
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// /**
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// * Adding hover highlights
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// */
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// if (this.options.hoverEnabled === true) {
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// // removing all hover highlights
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// for (var edgeId in this.hoverObj.edges) {
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// if (this.hoverObj.edges.hasOwnProperty(edgeId)) {
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// this.hoverObj.edges[edgeId].hover = false;
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// delete this.hoverObj.edges[edgeId];
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// }
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// }
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//
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// // adding hover highlights
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// var obj = this.selectionHandler.getNodeAt(pointer);
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// if (obj == null) {
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// obj = this.selectionHandler.getEdgeAt(pointer);
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// }
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// if (obj != null) {
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// this._hoverObject(obj);
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// }
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//
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// // removing all node hover highlights except for the selected one.
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// for (var nodeId in this.hoverObj.nodes) {
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// if (this.hoverObj.nodes.hasOwnProperty(nodeId)) {
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// if (obj instanceof Node && obj.id != nodeId || obj instanceof Edge || obj == null) {
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// this._blurObject(this.hoverObj.nodes[nodeId]);
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// delete this.hoverObj.nodes[nodeId];
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// }
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// }
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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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}
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export default InteractionHandler;
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