SmartCommunity/videoSurveillance/node_modules/diagram-js/lib/features/mouse-tracking/MouseTracking.js

import { bind } from 'min-dash';


export default function MouseTracking(eventBus, canvas) {
  this._eventBus = eventBus;
  this._canvas = canvas;

  this._init();
}

MouseTracking.$inject = [
  'eventBus',
  'canvas'
];


MouseTracking.prototype.getHoverContext = function() {
  var viewbox = this._canvas.viewbox();

  return {
    element: this._hoverElement,
    point: {
      x: viewbox.x + Math.round(this._mouseX / viewbox.scale),
      y: viewbox.y + Math.round(this._mouseY / viewbox.scale)
    }
  };
};

MouseTracking.prototype._init = function() {
  var eventBus = this._eventBus,
      canvas = this._canvas;

  var container = canvas.getContainer();

  this._setMousePosition = bind(this._setMousePosition, this);

  container.addEventListener('mousemove', this._setMousePosition);

  eventBus.on('diagram.destroy', function() {
    container.removeEventListener('mousemove', this._setMousePosition);
  }, this);

  eventBus.on('element.hover', this._setHoverElement, this);
};


MouseTracking.prototype._setHoverElement = function(event) {
  this._hoverElement = event.element;
};


MouseTracking.prototype._setMousePosition = function(event) {
  this._mouseX = event.layerX;
  this._mouseY = event.layerY;
};