vis.js is a dynamic, browser-based visualization library
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var util = require('../../util');
var Hammer = require('../../module/hammer');
exports._cleanNavigation = function() {
// clean up previous navigation items
var wrapper = document.getElementById('network-navigation_wrapper');
if (wrapper && wrapper.parentNode) {
wrapper.parentNode.removeChild(wrapper);
}
document.onmouseup = null;
};
/**
* 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
*/
exports._loadNavigationElements = function() {
this._cleanNavigation();
this.navigationDivs = {};
var navigationDivs = ['up','down','left','right','zoomIn','zoomOut','zoomExtends'];
var navigationDivActions = ['_moveUp','_moveDown','_moveLeft','_moveRight','_zoomIn','_zoomOut','zoomExtent'];
this.navigationDivs['wrapper'] = document.createElement('div');
this.navigationDivs['wrapper'].id = 'network-navigation_wrapper';
this.frame.appendChild(this.navigationDivs['wrapper']);
var me = this;
for (var i = 0; i < navigationDivs.length; i++) {
this.navigationDivs[navigationDivs[i]] = document.createElement('div');
this.navigationDivs[navigationDivs[i]].id = 'network-navigation_' + navigationDivs[i];
this.navigationDivs[navigationDivs[i]].className = 'network-navigation ' + navigationDivs[i];
this.navigationDivs['wrapper'].appendChild(this.navigationDivs[navigationDivs[i]]);
var hammer = Hammer(this.navigationDivs[navigationDivs[i]], {prevent_default: true});
hammer.on('touch', me[navigationDivActions[i]].bind(me));
}
var hammer = Hammer(document, {prevent_default: false});
hammer.on('release', me._stopMovement.bind(me));
};
/**
* this stops all movement induced by the navigation buttons
*
* @private
*/
exports._stopMovement = function() {
this._xStopMoving();
this._yStopMoving();
this._stopZoom();
};
/**
* move the screen up
* By using the increments, instead of adding a fixed number to the translation, we keep fluent and
* instant movement. The onKeypress event triggers immediately, then pauses, then triggers frequently
* To avoid this behaviour, we do the translation in the start loop.
*
* @private
*/
exports._moveUp = function(event) {
this.yIncrement = this.constants.keyboard.speed.y;
this.start(); // if there is no node movement, the calculation wont be done
event.preventDefault();
};
/**
* move the screen down
* @private
*/
exports._moveDown = function(event) {
this.yIncrement = -this.constants.keyboard.speed.y;
this.start(); // if there is no node movement, the calculation wont be done
event.preventDefault();
};
/**
* move the screen left
* @private
*/
exports._moveLeft = function(event) {
this.xIncrement = this.constants.keyboard.speed.x;
this.start(); // if there is no node movement, the calculation wont be done
event.preventDefault();
};
/**
* move the screen right
* @private
*/
exports._moveRight = function(event) {
this.xIncrement = -this.constants.keyboard.speed.y;
this.start(); // if there is no node movement, the calculation wont be done
event.preventDefault();
};
/**
* Zoom in, using the same method as the movement.
* @private
*/
exports._zoomIn = function(event) {
this.zoomIncrement = this.constants.keyboard.speed.zoom;
this.start(); // if there is no node movement, the calculation wont be done
event.preventDefault();
};
/**
* Zoom out
* @private
*/
exports._zoomOut = function(event) {
this.zoomIncrement = -this.constants.keyboard.speed.zoom;
this.start(); // if there is no node movement, the calculation wont be done
event.preventDefault();
};
/**
* Stop zooming and unhighlight the zoom controls
* @private
*/
exports._stopZoom = function(event) {
this.zoomIncrement = 0;
event && event.preventDefault();
};
/**
* Stop moving in the Y direction and unHighlight the up and down
* @private
*/
exports._yStopMoving = function(event) {
this.yIncrement = 0;
event && event.preventDefault();
};
/**
* Stop moving in the X direction and unHighlight left and right.
* @private
*/
exports._xStopMoving = function(event) {
this.xIncrement = 0;
event && event.preventDefault();
};