vis.js is a dynamic, browser-based visualization library
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var util = require('../../../util');
var Hammer = require('../../../module/hammer');
var hammerUtil = require('../../../hammerUtil');
var keycharm = require('keycharm');
class NavigationHandler {
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("release", () => {this._stopMovement();});
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 = {}
}
setOptions(options) {
if (options !== undefined) {
this.options = options;
this.create();
}
}
create() {
if (this.options.navigationButtons === true) {
if (this.iconsCreated === false) {
this.loadNavigationElements();
}
}
else if (this.iconsCreated === true) {
this.cleanNavigation();
}
this.configureKeyboardBindings();
}
cleanNavigation() {
// clean hammer bindings
if (this.navigationHammers.length != 0) {
for (var i = 0; i < this.navigationHammers.length; i++) {
this.navigationHammers[i].destroy();
}
this.navigationHammers = [];
}
this._navigationReleaseOverload = function() {};
// 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);
}
this.iconsCreated = true;
}
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");
}
}
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 = {};
}
_moveUp() {this.body.view.translation.y += this.options.keyboard.speed.y;}
_moveDown() {this.body.view.translation.y -= this.options.keyboard.speed.y;}
_moveLeft() {this.body.view.translation.x += this.options.keyboard.speed.x;}
_moveRight(){this.body.view.translation.x -= this.options.keyboard.speed.x;}
_zoomIn() {this.body.view.scale *= 1+this.options.keyboard.speed.zoom;}
_zoomOut() {this.body.view.scale /= 1+this.options.keyboard.speed.zoom;}
/**
* 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.bind(this, "_moveUp"), "keydown");
this.keycharm.bind("down", this.bindToRedraw.bind(this, "_moveDown"), "keydown");
this.keycharm.bind("left", this.bindToRedraw.bind(this, "_moveLeft"), "keydown");
this.keycharm.bind("right", this.bindToRedraw.bind(this, "_moveRight"), "keydown");
this.keycharm.bind("=", this.bindToRedraw.bind(this, "_zoomIn"), "keydown");
this.keycharm.bind("num+", this.bindToRedraw.bind(this, "_zoomIn"), "keydown");
this.keycharm.bind("num-", this.bindToRedraw.bind(this, "_zoomOut"), "keydown");
this.keycharm.bind("-", this.bindToRedraw.bind(this, "_zoomOut"), "keydown");
this.keycharm.bind("[", this.bindToRedraw.bind(this, "_zoomOut"), "keydown");
this.keycharm.bind("]", this.bindToRedraw.bind(this, "_zoomIn"), "keydown");
this.keycharm.bind("pageup", this.bindToRedraw.bind(this, "_zoomIn"), "keydown");
this.keycharm.bind("pagedown", this.bindToRedraw.bind(this, "_zoomOut"), "keydown");
this.keycharm.bind("up", this.unbindFromRedraw.bind(this, "_moveUp"), "keyup");
this.keycharm.bind("down", this.unbindFromRedraw.bind(this, "_moveDown"), "keyup");
this.keycharm.bind("left", this.unbindFromRedraw.bind(this, "_moveLeft"), "keyup");
this.keycharm.bind("right", this.unbindFromRedraw.bind(this, "_moveRight"), "keyup");
this.keycharm.bind("=", this.unbindFromRedraw.bind(this, "_zoomIn"), "keyup");
this.keycharm.bind("num+", this.unbindFromRedraw.bind(this, "_zoomIn"), "keyup");
this.keycharm.bind("num-", this.unbindFromRedraw.bind(this, "_zoomOut"), "keyup");
this.keycharm.bind("-", this.unbindFromRedraw.bind(this, "_zoomOut"), "keyup");
this.keycharm.bind("[", this.unbindFromRedraw.bind(this, "_zoomOut"), "keyup");
this.keycharm.bind("]", this.unbindFromRedraw.bind(this, "_zoomIn"), "keyup");
this.keycharm.bind("pageup", this.unbindFromRedraw.bind(this, "_zoomIn"), "keyup");
this.keycharm.bind("pagedown", this.unbindFromRedraw.bind(this, "_zoomOut"), "keyup");
}
}
}
}
export default NavigationHandler;