angular-gantt/src/core/ui/util/mouseButton.service.ts

Gantt chart component for AngularJS

/**
 * Mouse button cross browser normalization
 */
export default class GanttMouseButton {
  getButton (e: MouseEvent) {
    e = e || window.event as MouseEvent

    if (!e.which) {
      if (e.button === undefined) {
        return 1
      }
      return e.button < 2 ? 1 : e.button === 4 ? 2 : 3
    } else {
      return e.which
    }
  }
}