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181 lines
5.3 KiB
181 lines
5.3 KiB
var util = require('../../util');
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var Hammer = require('../../module/hammer');
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exports._cleanNavigation = function() {
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// clean hammer bindings
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if (this.navigationHammers.existing.length != 0) {
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for (var i = 0; i < this.navigationHammers.existing.length; i++) {
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this.navigationHammers.existing[i].dispose();
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}
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this.navigationHammers.existing = [];
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}
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// clean up previous navigation items
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var wrapper = document.getElementById('network-navigation_wrapper');
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if (wrapper && wrapper.parentNode) {
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wrapper.parentNode.removeChild(wrapper);
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}
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};
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/**
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* Creation of the navigation controls nodes. They are drawn over the rest of the nodes and are not affected by scale and translation
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* they have a triggerFunction which is called on click. If the position of the navigation controls is dependent
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* on this.frame.canvas.clientWidth or this.frame.canvas.clientHeight, we flag horizontalAlignLeft and verticalAlignTop false.
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* This means that the location will be corrected by the _relocateNavigation function on a size change of the canvas.
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*
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* @private
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*/
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exports._loadNavigationElements = function() {
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this._cleanNavigation();
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this.navigationDivs = {};
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var navigationDivs = ['up','down','left','right','zoomIn','zoomOut','zoomExtends'];
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var navigationDivActions = ['_moveUp','_moveDown','_moveLeft','_moveRight','_zoomIn','_zoomOut','_zoomExtent'];
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this.navigationDivs['wrapper'] = document.createElement('div');
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this.navigationDivs['wrapper'].id = 'network-navigation_wrapper';
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this.frame.appendChild(this.navigationDivs['wrapper']);
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for (var i = 0; i < navigationDivs.length; i++) {
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this.navigationDivs[navigationDivs[i]] = document.createElement('div');
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this.navigationDivs[navigationDivs[i]].id = 'network-navigation_' + navigationDivs[i];
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this.navigationDivs[navigationDivs[i]].className = 'network-navigation ' + navigationDivs[i];
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this.navigationDivs['wrapper'].appendChild(this.navigationDivs[navigationDivs[i]]);
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var hammer = Hammer(this.navigationDivs[navigationDivs[i]], {prevent_default: true});
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hammer.on('touch', this[navigationDivActions[i]].bind(this));
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this.navigationHammers.new.push(hammer);
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}
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var hammerDoc = Hammer(document, {prevent_default: false});
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hammerDoc.on('release', this._stopMovement.bind(this));
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this.navigationHammers.new.push(hammerDoc);
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this.navigationHammers.existing = this.navigationHammers.new;
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};
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/**
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* this stops all movement induced by the navigation buttons
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*
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* @private
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*/
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exports._zoomExtent = function(event) {
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// FIXME: this is a workaround because the binding of Hammer on Document makes this fire twice
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if (this._zoomExtentLastTime === undefined || new Date() - this._zoomExtentLastTime > 200) {
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this._zoomExtentLastTime = new Date();
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this.zoomExtent({duration:800});
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event.stopPropagation();
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}
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};
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/**
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* this stops all movement induced by the navigation buttons
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*
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* @private
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*/
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exports._stopMovement = function() {
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this._xStopMoving();
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this._yStopMoving();
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this._stopZoom();
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};
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/**
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* move the screen up
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* By using the increments, instead of adding a fixed number to the translation, we keep fluent and
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* instant movement. The onKeypress event triggers immediately, then pauses, then triggers frequently
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* To avoid this behaviour, we do the translation in the start loop.
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*
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* @private
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*/
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exports._moveUp = function(event) {
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this.yIncrement = this.constants.keyboard.speed.y;
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this.start(); // if there is no node movement, the calculation wont be done
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event.preventDefault();
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};
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/**
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* move the screen down
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* @private
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*/
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exports._moveDown = function(event) {
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this.yIncrement = -this.constants.keyboard.speed.y;
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this.start(); // if there is no node movement, the calculation wont be done
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event.preventDefault();
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};
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/**
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* move the screen left
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* @private
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*/
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exports._moveLeft = function(event) {
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this.xIncrement = this.constants.keyboard.speed.x;
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this.start(); // if there is no node movement, the calculation wont be done
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event.preventDefault();
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};
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/**
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* move the screen right
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* @private
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*/
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exports._moveRight = function(event) {
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this.xIncrement = -this.constants.keyboard.speed.y;
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this.start(); // if there is no node movement, the calculation wont be done
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event.preventDefault();
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};
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/**
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* Zoom in, using the same method as the movement.
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* @private
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*/
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exports._zoomIn = function(event) {
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this.zoomIncrement = this.constants.keyboard.speed.zoom;
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this.start(); // if there is no node movement, the calculation wont be done
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event.preventDefault();
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};
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/**
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* Zoom out
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* @private
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*/
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exports._zoomOut = function(event) {
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this.zoomIncrement = -this.constants.keyboard.speed.zoom;
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this.start(); // if there is no node movement, the calculation wont be done
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event.preventDefault();
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};
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/**
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* Stop zooming and unhighlight the zoom controls
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* @private
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*/
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exports._stopZoom = function(event) {
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this.zoomIncrement = 0;
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event && event.preventDefault();
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};
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/**
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* Stop moving in the Y direction and unHighlight the up and down
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* @private
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*/
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exports._yStopMoving = function(event) {
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this.yIncrement = 0;
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event && event.preventDefault();
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};
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/**
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* Stop moving in the X direction and unHighlight left and right.
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* @private
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*/
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exports._xStopMoving = function(event) {
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this.xIncrement = 0;
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event && event.preventDefault();
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};
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