lib/network/modules/components/NavigationHandler.js
var Hammer = require('../../../module/hammer');
var hammerUtil = require('../../../hammerUtil');
var keycharm = require('keycharm');
/**
* Navigation Handler
*/
class NavigationHandler {
/**
* @param {Object} body
* @param {Canvas} canvas
*/
constructor(body, canvas) {
this.body = body;
this.canvas = canvas;
this.iconsCreated = false;
this.navigationHammers = [];
this.boundFunctions = {};
this.touchTime = 0;
this.activated = false;
this.body.emitter.on("activate", () => {this.activated = true; this.configureKeyboardBindings();});
this.body.emitter.on("deactivate", () => {this.activated = false; this.configureKeyboardBindings();});
this.body.emitter.on("destroy", () => {if (this.keycharm !== undefined) {this.keycharm.destroy();}});
this.options = {}
}
/**
*
* @param {Object} options
*/
setOptions(options) {
if (options !== undefined) {
this.options = options;
this.create();
}
}
/**
* Creates or refreshes navigation and sets key bindings
*/
create() {
if (this.options.navigationButtons === true) {
if (this.iconsCreated === false) {
this.loadNavigationElements();
}
}
else if (this.iconsCreated === true) {
this.cleanNavigation();
}
this.configureKeyboardBindings();
}
/**
* Cleans up previous navigation items
*/
cleanNavigation() {
// clean hammer bindings
if (this.navigationHammers.length != 0) {
for (var i = 0; i < this.navigationHammers.length; i++) {
this.navigationHammers[i].destroy();
}
this.navigationHammers = [];
}
// clean up previous navigation items
if (this.navigationDOM && this.navigationDOM['wrapper'] && this.navigationDOM['wrapper'].parentNode) {
this.navigationDOM['wrapper'].parentNode.removeChild(this.navigationDOM['wrapper']);
}
this.iconsCreated = false;
}
/**
* Creation of the navigation controls nodes. They are drawn over the rest of the nodes and are not affected by scale and translation
* they have a triggerFunction which is called on click. If the position of the navigation controls is dependent
* on this.frame.canvas.clientWidth or this.frame.canvas.clientHeight, we flag horizontalAlignLeft and verticalAlignTop false.
* This means that the location will be corrected by the _relocateNavigation function on a size change of the canvas.
*
* @private
*/
loadNavigationElements() {
this.cleanNavigation();
this.navigationDOM = {};
var navigationDivs = ['up','down','left','right','zoomIn','zoomOut','zoomExtends'];
var navigationDivActions = ['_moveUp','_moveDown','_moveLeft','_moveRight','_zoomIn','_zoomOut','_fit'];
this.navigationDOM['wrapper'] = document.createElement('div');
this.navigationDOM['wrapper'].className = 'vis-navigation';
this.canvas.frame.appendChild(this.navigationDOM['wrapper']);
for (var i = 0; i < navigationDivs.length; i++) {
this.navigationDOM[navigationDivs[i]] = document.createElement('div');
this.navigationDOM[navigationDivs[i]].className = 'vis-button vis-' + navigationDivs[i];
this.navigationDOM['wrapper'].appendChild(this.navigationDOM[navigationDivs[i]]);
var hammer = new Hammer(this.navigationDOM[navigationDivs[i]]);
if (navigationDivActions[i] === "_fit") {
hammerUtil.onTouch(hammer, this._fit.bind(this));
}
else {
hammerUtil.onTouch(hammer, this.bindToRedraw.bind(this,navigationDivActions[i]));
}
this.navigationHammers.push(hammer);
}
// use a hammer for the release so we do not require the one used in the rest of the network
// the one the rest uses can be overloaded by the manipulation system.
var hammerFrame = new Hammer(this.canvas.frame);
hammerUtil.onRelease(hammerFrame, () => {this._stopMovement();});
this.navigationHammers.push(hammerFrame);
this.iconsCreated = true;
}
/**
*
* @param {string} action
*/
bindToRedraw(action) {
if (this.boundFunctions[action] === undefined) {
this.boundFunctions[action] = this[action].bind(this);
this.body.emitter.on("initRedraw", this.boundFunctions[action]);
this.body.emitter.emit("_startRendering");
}
}
/**
*
* @param {string} action
*/
unbindFromRedraw(action) {
if (this.boundFunctions[action] !== undefined) {
this.body.emitter.off("initRedraw", this.boundFunctions[action]);
this.body.emitter.emit("_stopRendering");
delete this.boundFunctions[action];
}
}
/**
* this stops all movement induced by the navigation buttons
*
* @private
*/
_fit() {
if (new Date().valueOf() - this.touchTime > 700) { // TODO: fix ugly hack to avoid hammer's double fireing of event (because we use release?)
this.body.emitter.emit("fit", {duration: 700});
this.touchTime = new Date().valueOf();
}
}
/**
* this stops all movement induced by the navigation buttons
*
* @private
*/
_stopMovement() {
for (let boundAction in this.boundFunctions) {
if (this.boundFunctions.hasOwnProperty(boundAction)) {
this.body.emitter.off("initRedraw", this.boundFunctions[boundAction]);
this.body.emitter.emit("_stopRendering");
}
}
this.boundFunctions = {};
}
/**
*
* @private
*/
_moveUp() {this.body.view.translation.y += this.options.keyboard.speed.y;}
/**
*
* @private
*/
_moveDown() {this.body.view.translation.y -= this.options.keyboard.speed.y;}
/**
*
* @private
*/
_moveLeft() {this.body.view.translation.x += this.options.keyboard.speed.x;}
/**
*
* @private
*/
_moveRight(){this.body.view.translation.x -= this.options.keyboard.speed.x;}
/**
*
* @private
*/
_zoomIn() {
var scaleOld = this.body.view.scale;
var scale = this.body.view.scale * (1 + this.options.keyboard.speed.zoom);
var translation = this.body.view.translation;
var scaleFrac = scale / scaleOld;
var tx = (1 - scaleFrac) * this.canvas.canvasViewCenter.x + translation.x * scaleFrac;
var ty = (1 - scaleFrac) * this.canvas.canvasViewCenter.y + translation.y * scaleFrac;
this.body.view.scale = scale;
this.body.view.translation = { x: tx, y: ty };
this.body.emitter.emit('zoom', { direction: '+', scale: this.body.view.scale, pointer: null });
}
/**
*
* @private
*/
_zoomOut() {
var scaleOld = this.body.view.scale;
var scale = this.body.view.scale / (1 + this.options.keyboard.speed.zoom);
var translation = this.body.view.translation;
var scaleFrac = scale / scaleOld;
var tx = (1 - scaleFrac) * this.canvas.canvasViewCenter.x + translation.x * scaleFrac;
var ty = (1 - scaleFrac) * this.canvas.canvasViewCenter.y + translation.y * scaleFrac;
this.body.view.scale = scale;
this.body.view.translation = { x: tx, y: ty };
this.body.emitter.emit('zoom', { direction: '-', scale: this.body.view.scale, pointer: null });
}
/**
* bind all keys using keycharm.
*/
configureKeyboardBindings() {
if (this.keycharm !== undefined) {
this.keycharm.destroy();
}
if (this.options.keyboard.enabled === true) {
if (this.options.keyboard.bindToWindow === true) {
this.keycharm = keycharm({container: window, preventDefault: true});
}
else {
this.keycharm = keycharm({container: this.canvas.frame, preventDefault: true});
}
this.keycharm.reset();
if (this.activated === true) {
this.keycharm.bind("up", () => {this.bindToRedraw("_moveUp") ;}, "keydown");
this.keycharm.bind("down", () => {this.bindToRedraw("_moveDown") ;}, "keydown");
this.keycharm.bind("left", () => {this.bindToRedraw("_moveLeft") ;}, "keydown");
this.keycharm.bind("right", () => {this.bindToRedraw("_moveRight");}, "keydown");
this.keycharm.bind("=", () => {this.bindToRedraw("_zoomIn") ;}, "keydown");
this.keycharm.bind("num+", () => {this.bindToRedraw("_zoomIn") ;}, "keydown");
this.keycharm.bind("num-", () => {this.bindToRedraw("_zoomOut") ;}, "keydown");
this.keycharm.bind("-", () => {this.bindToRedraw("_zoomOut") ;}, "keydown");
this.keycharm.bind("[", () => {this.bindToRedraw("_zoomOut") ;}, "keydown");
this.keycharm.bind("]", () => {this.bindToRedraw("_zoomIn") ;}, "keydown");
this.keycharm.bind("pageup", () => {this.bindToRedraw("_zoomIn") ;}, "keydown");
this.keycharm.bind("pagedown", () => {this.bindToRedraw("_zoomOut") ;}, "keydown");
this.keycharm.bind("up", () => {this.unbindFromRedraw("_moveUp") ;}, "keyup");
this.keycharm.bind("down", () => {this.unbindFromRedraw("_moveDown") ;}, "keyup");
this.keycharm.bind("left", () => {this.unbindFromRedraw("_moveLeft") ;}, "keyup");
this.keycharm.bind("right", () => {this.unbindFromRedraw("_moveRight");}, "keyup");
this.keycharm.bind("=", () => {this.unbindFromRedraw("_zoomIn") ;}, "keyup");
this.keycharm.bind("num+", () => {this.unbindFromRedraw("_zoomIn") ;}, "keyup");
this.keycharm.bind("num-", () => {this.unbindFromRedraw("_zoomOut") ;}, "keyup");
this.keycharm.bind("-", () => {this.unbindFromRedraw("_zoomOut") ;}, "keyup");
this.keycharm.bind("[", () => {this.unbindFromRedraw("_zoomOut") ;}, "keyup");
this.keycharm.bind("]", () => {this.unbindFromRedraw("_zoomIn") ;}, "keyup");
this.keycharm.bind("pageup", () => {this.unbindFromRedraw("_zoomIn") ;}, "keyup");
this.keycharm.bind("pagedown", () => {this.unbindFromRedraw("_zoomOut") ;}, "keyup");
}
}
}
}
export default NavigationHandler;